intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029
author: Devtools Arcadia <arcadia-devtools@yandex-team.ru> 2022-02-07 18:08:42 +0300
committer: Devtools Arcadia <arcadia-devtools@mous.vla.yp-c.yandex.net> 2022-02-07 18:08:42 +0300
commit: 1110808a9d39d4b808aef724c861a2e1a38d2a69 (patch)
tree: e26c9fed0de5d9873cce7e00bc214573dc2195b7 /library/cpp/tvmauth/client
download: ydb-1110808a9d39d4b808aef724c861a2e1a38d2a69.tar.gz
92 files changed, 11548 insertions, 0 deletions
diff --git a/library/cpp/tvmauth/client/README.md b/library/cpp/tvmauth/client/README.md
new file mode 100644
index 00000000000..239f55de7ad
--- /dev/null
+++ b/library/cpp/tvmauth/client/README.md
@@ -0,0 +1,56 @@
+Overview
+===
+This library provides ability to operate with TVM. Library is fast enough to get or check tickets for every request without burning CPU.
+
+[Home page of project](https://wiki.yandex-team.ru/passport/tvm2/)
+You can find some examples in [here](https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/examples).
+
+You can ask questions: [PASSPORTDUTY](https://st.yandex-team.ru/createTicket?queue=PASSPORTDUTY&_form=77618)
+
+TvmClient
+===
+Don't forget to collect logs from client.
+___
+`TvmClient` allowes:
+1. `GetServiceTicketFor()` - to fetch ServiceTicket for outgoing request
+2. `CheckServiceTicket()` - to check ServiceTicket from incoming request
+3. `CheckUserTicket()` - to check UserTicket from incoming request
+
+All methods are thread-safe.
+
+You should check status of `CheckedServiceTicket` or `CheckedUserTicket` for equality 'Ok'. You can get ticket fields (src/uids/scopes) only for correct ticket. Otherwise exception will be thrown.
+___
+You should check status of client with `GetStatus()`:
+* `OK` - nothing to do here
+* `Warning` - **you should trigger your monitoring alert**
+
+      Normal operation of TvmClient is still possible but there are problems with refreshing cache, so it is expiring.
+      Is tvm-api.yandex.net accessible?
+      Have you changed your TVM-secret or your backend (dst) deleted its TVM-client?
+
+* `Error` - **you should trigger your monitoring alert and close this instance for user-traffic**
+
+      TvmClient's cache is already invalid (expired) or soon will be: you can't check valid ServiceTicket or be authenticated by your backends (dsts)
+
+___
+Constructor creates system thread for refreshing cache - so do not fork your proccess after creating `TTvmClient` instance. Constructor leads to network I/O. Other methods always use memory.
+
+Exceptions maybe thrown from constructor:
+* `TRetriableException` - maybe some network trouble: you can try to create client one more time.
+* `TNonRetriableException` - settings are bad: fix them.
+___
+You can choose way for fetching data for your service operation:
+* http://localhost:{port}/tvm - recomended way
+* https://tvm-api.yandex.net
+
+TvmTool
+------------
+`TTvmClient` uses local http-interface to get state. This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+See more: https://wiki.yandex-team.ru/passport/tvm2/tvm-daemon/.
+
+`TTvmClient` fetches configuration from tvmtool, so you need only to tell client how to connect to it and tell which alias of tvm id should be used for this `TvmClient` instance.
+
+TvmApi
+------------
+First of all: please use `SetDiskCacheDir()` - it provides reliability for your service and for tvm-api.
+Please check restrictions of this method.
diff --git a/library/cpp/tvmauth/client/client_status.cpp b/library/cpp/tvmauth/client/client_status.cpp
new file mode 100644
index 00000000000..eca35ba22b0
--- /dev/null
+++ b/library/cpp/tvmauth/client/client_status.cpp
@@ -0,0 +1,6 @@
+#include "client_status.h"
+
+template <>
+void Out<NTvmAuth::TClientStatus>(IOutputStream& out, const NTvmAuth::TClientStatus& s) {
+    out << s.GetCode() << ": " << s.GetLastError();
+}
diff --git a/library/cpp/tvmauth/client/client_status.h b/library/cpp/tvmauth/client/client_status.h
new file mode 100644
index 00000000000..bbaf29d289f
--- /dev/null
+++ b/library/cpp/tvmauth/client/client_status.h
@@ -0,0 +1,82 @@
+#pragma once
+
+#include <util/generic/string.h>
+#include <util/string/builder.h>
+
+namespace NTvmAuth {
+    class TClientStatus {
+    public:
+        enum ECode {
+            Ok,
+            Warning,
+            Error,
+            IncompleteTicketsSet,
+        };
+
+        TClientStatus(ECode state, TString&& lastError)
+            : Code_(state)
+            , LastError_(std::move(lastError))
+        {
+        }
+
+        TClientStatus() = default;
+        TClientStatus(const TClientStatus&) = default;
+        TClientStatus(TClientStatus&&) = default;
+
+        TClientStatus& operator=(const TClientStatus&) = default;
+        TClientStatus& operator=(TClientStatus&&) = default;
+
+        ECode GetCode() const {
+            return Code_;
+        }
+
+        const TString& GetLastError() const {
+            return LastError_;
+        }
+
+        TString CreateJugglerMessage() const {
+            return TStringBuilder() << GetJugglerCode() << ";TvmClient: " << LastError_ << "\n";
+        }
+
+    private:
+        int32_t GetJugglerCode() const {
+            switch (Code_) {
+                case ECode::Ok:
+                    return 0; // OK juggler check state
+                case ECode::Warning:
+                case ECode::IncompleteTicketsSet:
+                    return 1; // WARN juggler check state
+                case ECode::Error:
+                    return 2; // CRIT juggler check state
+            }
+            return 2; // This should not happen, so set check state as CRIT.
+        }
+
+        ECode Code_ = Ok;
+        TString LastError_;
+    };
+
+    static inline bool operator==(const TClientStatus& l, const TClientStatus& r) noexcept {
+        return l.GetCode() == r.GetCode() && l.GetLastError() == r.GetLastError();
+    }
+
+    static inline bool operator==(const TClientStatus& l, const TClientStatus::ECode r) noexcept {
+        return l.GetCode() == r;
+    }
+
+    static inline bool operator==(const TClientStatus::ECode l, const TClientStatus& r) noexcept {
+        return r.GetCode() == l;
+    }
+
+    static inline bool operator!=(const TClientStatus& l, const TClientStatus& r) noexcept {
+        return !(l == r);
+    }
+
+    static inline bool operator!=(const TClientStatus& l, const TClientStatus::ECode r) noexcept {
+        return !(l == r);
+    }
+
+    static inline bool operator!=(const TClientStatus::ECode l, const TClientStatus& r) noexcept {
+        return !(l == r);
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp b/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp
new file mode 100644
index 00000000000..c03a7a032fa
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmapi/create.cpp
@@ -0,0 +1,102 @@
+#include <library/cpp/tvmauth/client/facade.h>
+
+namespace NExample {
+    NTvmAuth::TTvmClient CreateClientForCheckingAllTicketsAndFetchingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .FetchServiceTicketsForDstsWithAliases = {
+                {"bb", 224},
+                {"datasync", 2000060},
+            },
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = NTvmAuth::EBlackboxEnv::Test,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+        // c.CheckUserTicket("some user ticket")
+        // c.GetServiceTicketFor("bb")
+        // c.GetServiceTicketFor(224)
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingAllTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .CheckServiceTickets = true,
+            .CheckUserTicketsWithBbEnv = NTvmAuth::EBlackboxEnv::Test,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+        // c.CheckUserTicket("some user ticket")
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForFetchingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .FetchServiceTicketsForDstsWithAliases = {
+                {"bb", 224},
+                {"datasync", 2000060},
+            },
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.GetServiceTicketFor("bb")
+        // c.GetServiceTicketFor(224)
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingServiceTickets() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .CheckServiceTickets = true,
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // c.CheckServiceTicket("some service ticket")
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForCheckingServiceTicketsWithRoles() {
+        NTvmAuth::NTvmApi::TClientSettings setts{
+            .DiskCacheDir = "/var/cache/my_service/tvm/",
+            .SelfTvmId = 11,
+            .Secret = (TStringBuf) "AAAAAAAAAAAAAAAAAAAAAA",
+            .CheckServiceTickets = true,
+            .FetchRolesForIdmSystemSlug = "passporttestservice",
+        };
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        // auto t = c.CheckServiceTicket("some service ticket")
+        // c.GetRoles()->CheckServiceRole(t, "some role");
+
+        return c;
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmapi/ya.make b/library/cpp/tvmauth/client/examples/create_with_tvmapi/ya.make
new file mode 100644
index 00000000000..fc69a06dbdc
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmapi/ya.make
@@ -0,0 +1,13 @@
+LIBRARY()
+
+OWNER(g:passport_infra)
+
+PEERDIR(
+    library/cpp/tvmauth/client
+)
+
+SRCS(
+    create.cpp
+)
+
+END()
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp b/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp
new file mode 100644
index 00000000000..a87d3e705d9
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmtool/create.cpp
@@ -0,0 +1,34 @@
+#include <library/cpp/tvmauth/client/facade.h>
+
+namespace NExample {
+    // Possibility of using functions depends on config of tvmtool
+    //    CheckServiceTicket
+    //    CheckUserTicket
+    //    GetServiceTicketFor
+
+    NTvmAuth::TTvmClient CreateClientInQloudOrYandexDeploy() {
+        NTvmAuth::NTvmTool::TClientSettings setts(
+            "my_service" // specified in Qloud/YP/tvmtool interface
+        );
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        return c;
+    }
+
+    NTvmAuth::TTvmClient CreateClientForDevOrTests() {
+        NTvmAuth::NTvmTool::TClientSettings setts(
+            "my_service" // specified in Qloud/YP/tvmtool interface
+        );
+        setts.SetPort(18080);
+        setts.SetAuthToken("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
+
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        NTvmAuth::TTvmClient c(setts, log);
+
+        return c;
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/create_with_tvmtool/ya.make b/library/cpp/tvmauth/client/examples/create_with_tvmtool/ya.make
new file mode 100644
index 00000000000..fc69a06dbdc
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/create_with_tvmtool/ya.make
@@ -0,0 +1,13 @@
+LIBRARY()
+
+OWNER(g:passport_infra)
+
+PEERDIR(
+    library/cpp/tvmauth/client
+)
+
+SRCS(
+    create.cpp
+)
+
+END()
diff --git a/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp
new file mode 100644
index 00000000000..075bf0bded3
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.cpp
@@ -0,0 +1,84 @@
+#include "service.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+
+#include <library/cpp/cgiparam/cgiparam.h>
+#include <library/cpp/http/server/response.h>
+#include <library/cpp/http/simple/http_client.h>
+#include <library/cpp/json/json_reader.h>
+
+namespace NExample {
+    static const TString BACK_C = "BACK_C";
+
+    TSomeService::TSomeService(const TConfig& cfg)
+        : Config_(cfg)
+    {
+        NTvmAuth::TLoggerPtr log = MakeIntrusive<NTvmAuth::TCerrLogger>(7);
+
+        Tvm_ = MakeHolder<NTvmAuth::TTvmClient>(
+            NTvmAuth::NTvmTool::TClientSettings(
+                "my_service" // specified in Qloud/YP/tvmtool interface
+                ),
+            log);
+    }
+
+    TSomeService::~TSomeService() {
+    }
+
+    void TSomeService::HandleRequest(THttpInput& in, THttpOutput& out) {
+        auto servIt = std::find_if(in.Headers().Begin(),
+                                   in.Headers().End(),
+                                   [](const auto& h) { return h.Name() == "X-Ya-Service-Ticket"; });
+        auto userIt = std::find_if(in.Headers().Begin(),
+                                   in.Headers().End(),
+                                   [](const auto& h) { return h.Name() == "X-Ya-User-Ticket"; });
+        try {
+            if (servIt == in.Headers().End() || userIt == in.Headers().End()) {
+                ythrow yexception() << "Need tickets";
+            }
+
+            // WARNING: См. Здесь
+            NTvmAuth::TCheckedServiceTicket st = Tvm_->CheckServiceTicket(servIt->Value());
+            NTvmAuth::TCheckedUserTicket ut = Tvm_->CheckUserTicket(userIt->Value());
+            if (!st || !ut) {
+                ythrow yexception() << "Invalid tickets";
+            }
+
+            // WARNING: См. Здесь
+            // Ждём ABC - после их релиза эти три строки можно будет удалить
+            if (Config_.AllowedTvmIds.find(st.GetSrc()) == Config_.AllowedTvmIds.end()) {
+                ythrow yexception() << "Consumer is not allowed";
+            }
+
+            // WARNING: См. Здесь
+            if (!ut.HasScope("some_service:allow_secret_data")) {
+                ythrow yexception() << "UserTicket does not have scopes for secret data";
+            }
+
+            // Access-log
+            Cout << "Data fetched for: " << ut.GetDefaultUid() << Endl;
+
+            THttpResponse resp(HTTP_OK);
+            resp.SetContent(GetDataFromBackendC(userIt->Value()), "text/plain");
+            resp.OutTo(out);
+        } catch (...) {
+            THttpResponse resp(HTTP_BAD_REQUEST);
+            resp.SetContent("Request can not be performed", "text/plain");
+            resp.OutTo(out);
+        }
+
+        out.Finish();
+    }
+
+    TString TSomeService::GetDataFromBackendC(const TString& userTicket) {
+        TSimpleHttpClient cl("my_backend", // specified in Qloud/YP/tvmtool interface
+                             80);
+        TStringStream s;
+        cl.DoGet("/api?",
+                 &s,
+                 // WARNING: См. Здесь
+                 {{"X-Ya-Service-Ticket", Tvm_->GetServiceTicketFor(BACK_C)},
+                  {"X-Ya-User-Ticket", userTicket}});
+        return s.Str();
+    }
+}
diff --git a/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h
new file mode 100644
index 00000000000..8ff948334e0
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/service.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <library/cpp/http/io/stream.h>
+
+#include <util/generic/ptr.h>
+
+#include <unordered_set>
+
+namespace NTvmAuth {
+    class TTvmClient;
+}
+
+namespace NExample {
+    struct TConfig {
+        using TAllowedTvmIds = std::unordered_set<ui32>;
+
+        TAllowedTvmIds AllowedTvmIds;
+    };
+
+    class TSomeService {
+    public:
+        TSomeService(const TConfig& cfg);
+        ~TSomeService();
+
+        void HandleRequest(THttpInput& in, THttpOutput& out);
+
+    private:
+        TString GetDataFromBackendC(const TString& userTicket);
+
+    private:
+        // WARNING: См. Здесь
+        TConfig Config_;
+        THolder<NTvmAuth::TTvmClient> Tvm_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/ya.make b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/ya.make
new file mode 100644
index 00000000000..dde9e7a00d9
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/service_using_tvmtool_client/ya.make
@@ -0,0 +1,15 @@
+LIBRARY()
+
+OWNER(g:passport_infra)
+
+PEERDIR(
+    library/cpp/cgiparam
+    library/cpp/http/simple
+    library/cpp/tvmauth/client
+)
+
+SRCS(
+    service.cpp
+)
+
+END()
diff --git a/library/cpp/tvmauth/client/examples/ya.make b/library/cpp/tvmauth/client/examples/ya.make
new file mode 100644
index 00000000000..cd17e550a61
--- /dev/null
+++ b/library/cpp/tvmauth/client/examples/ya.make
@@ -0,0 +1,5 @@
+RECURSE(
+    create_with_tvmapi
+    create_with_tvmtool
+    service_using_tvmtool_client
+)
diff --git a/library/cpp/tvmauth/client/exception.h b/library/cpp/tvmauth/client/exception.h
new file mode 100644
index 00000000000..7639467671c
--- /dev/null
+++ b/library/cpp/tvmauth/client/exception.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <library/cpp/tvmauth/exception.h>
+
+namespace NTvmAuth {
+    class TClientException: public TTvmException {
+    };
+
+    class TRetriableException: public TClientException {
+    };
+    class TNonRetriableException: public TClientException {
+    };
+
+    class TIllegalUsage: public TNonRetriableException {
+    };
+
+    class TBrokenTvmClientSettings: public TIllegalUsage {
+    };
+    class TMissingServiceTicket: public TNonRetriableException {
+    };
+    class TPermissionDenied: public TNonRetriableException {
+    };
+}
diff --git a/library/cpp/tvmauth/client/facade.cpp b/library/cpp/tvmauth/client/facade.cpp
new file mode 100644
index 00000000000..6e775694411
--- /dev/null
+++ b/library/cpp/tvmauth/client/facade.cpp
@@ -0,0 +1,131 @@
+#include "facade.h"
+
+#include "misc/checker.h"
+#include "misc/default_uid_checker.h"
+#include "misc/getter.h"
+#include "misc/src_checker.h"
+#include "misc/api/threaded_updater.h"
+#include "misc/tool/threaded_updater.h"
+
+namespace NTvmAuth {
+    TTvmClient::TTvmClient(const NTvmTool::TClientSettings& settings, TLoggerPtr logger)
+        : Updater_(NTvmTool::TThreadedUpdater::Create(settings, std::move(logger)))
+        , Service_(MakeHolder<TServiceTicketChecker>(Updater_))
+        , User_(MakeHolder<TUserTicketChecker>(Updater_))
+    {
+        if (Updater_->GetCachedServiceTickets()) {
+            Tickets_ = MakeHolder<TServiceTicketGetter>(Updater_);
+        }
+    }
+
+    TTvmClient::TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger)
+        : Updater_(NTvmApi::TThreadedUpdater::Create(settings, std::move(logger)))
+    {
+        if (settings.IsServiceTicketFetchingRequired()) {
+            Tickets_ = MakeHolder<TServiceTicketGetter>(Updater_);
+        }
+        if (settings.IsServiceTicketCheckingRequired()) {
+            Service_ = MakeHolder<TServiceTicketChecker>(Updater_);
+        }
+        if (settings.IsUserTicketCheckingRequired()) {
+            User_ = MakeHolder<TUserTicketChecker>(Updater_);
+        }
+        if (settings.IsRolesFetchingEnabled() && settings.ShouldCheckSrc) {
+            SrcChecker_ = MakeHolder<TSrcChecker>(Updater_);
+        }
+        if (settings.IsRolesFetchingEnabled() && settings.ShouldCheckDefaultUid) {
+            DefaultUidChecker_ = MakeHolder<TDefaultUidChecker>(Updater_);
+        }
+    }
+
+    TTvmClient::TTvmClient(TAsyncUpdaterPtr updater)
+        : Updater_(std::move(updater))
+    {
+        if (Updater_->GetCachedServiceTickets()) {
+            Tickets_ = MakeHolder<TServiceTicketGetter>(Updater_);
+        }
+        if (Updater_->GetCachedServiceContext()) {
+            Service_ = MakeHolder<TServiceTicketChecker>(Updater_);
+        }
+        if (Updater_->GetCachedUserContext()) {
+            User_ = MakeHolder<TUserTicketChecker>(Updater_);
+        }
+
+        try {
+            if (Updater_->GetRoles()) {
+                SrcChecker_ = MakeHolder<TSrcChecker>(Updater_);
+                DefaultUidChecker_ = MakeHolder<TDefaultUidChecker>(Updater_);
+            }
+        } catch (const TIllegalUsage&) {
+            // it is a test probably
+        }
+    }
+
+    TTvmClient::TTvmClient(TTvmClient&& o) = default;
+    TTvmClient::~TTvmClient() = default;
+    TTvmClient& TTvmClient::operator=(TTvmClient&& o) = default;
+
+    TClientStatus TTvmClient::GetStatus() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetStatus();
+    }
+
+    TInstant TTvmClient::GetUpdateTimeOfPublicKeys() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetUpdateTimeOfPublicKeys();
+    }
+
+    TInstant TTvmClient::GetUpdateTimeOfServiceTickets() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetUpdateTimeOfServiceTickets();
+    }
+
+    TInstant TTvmClient::GetInvalidationTimeOfPublicKeys() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetInvalidationTimeOfPublicKeys();
+    }
+
+    TInstant TTvmClient::GetInvalidationTimeOfServiceTickets() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetInvalidationTimeOfServiceTickets();
+    }
+
+    TString TTvmClient::GetServiceTicketFor(const TClientSettings::TAlias& dst) const {
+        Y_ENSURE_EX(Tickets_, TBrokenTvmClientSettings()
+                                  << "Need to enable ServiceTickets fetching");
+        return Tickets_->GetTicket(dst);
+    }
+
+    TString TTvmClient::GetServiceTicketFor(const TTvmId dst) const {
+        Y_ENSURE_EX(Tickets_, TBrokenTvmClientSettings()
+                                  << "Need to enable ServiceTickets fetching");
+        return Tickets_->GetTicket(dst);
+    }
+
+    TCheckedServiceTicket TTvmClient::CheckServiceTicket(TStringBuf ticket) const {
+        Y_ENSURE_EX(Service_, TBrokenTvmClientSettings()
+                                  << "Need to use TClientSettings::EnableServiceTicketChecking()");
+
+        TCheckedServiceTicket res = Service_->Check(ticket);
+        if (SrcChecker_ && res) {
+            return SrcChecker_->Check(std::move(res));
+        }
+        return res;
+    }
+
+    TCheckedUserTicket TTvmClient::CheckUserTicket(TStringBuf ticket, TMaybe<EBlackboxEnv> overrideEnv) const {
+        Y_ENSURE_EX(User_, TBrokenTvmClientSettings()
+                               << "Need to use TClientSettings::EnableUserTicketChecking()");
+
+        TCheckedUserTicket res = User_->Check(ticket, overrideEnv);
+        if (DefaultUidChecker_ && res) {
+            return DefaultUidChecker_->Check(std::move(res));
+        }
+        return User_->Check(ticket, overrideEnv);
+    }
+
+    NRoles::TRolesPtr TTvmClient::GetRoles() const {
+        Y_ENSURE(Updater_);
+        return Updater_->GetRoles();
+    }
+}
diff --git a/library/cpp/tvmauth/client/facade.h b/library/cpp/tvmauth/client/facade.h
new file mode 100644
index 00000000000..34d4b11a00c
--- /dev/null
+++ b/library/cpp/tvmauth/client/facade.h
@@ -0,0 +1,119 @@
+#pragma once
+
+#include "misc/async_updater.h"
+#include "misc/api/settings.h"
+#include "misc/tool/settings.h"
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+
+namespace NTvmAuth {
+    class TDefaultUidChecker;
+    class TServiceTicketGetter;
+    class TServiceTicketChecker;
+    class TSrcChecker;
+    class TUserTicketChecker;
+
+    /*!
+     * Long lived thread-safe object for interacting with TVM.
+     * In 99% cases TvmClient shoud be created at service startup and live for the whole process lifetime.
+     */
+    class TTvmClient {
+    public:
+        /*!
+         * Uses local http-interface to get state: http://localhost/tvm/.
+         * This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+         * See more: https://wiki.yandex-team.ru/passport/tvm2/tvm-daemon/.
+         *
+         * Starts thread for updating of in-memory cache in background
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        TTvmClient(const NTvmTool::TClientSettings& settings, TLoggerPtr logger);
+
+        /*!
+         * Uses general way to get state: https://tvm-api.yandex.net.
+         * It is not recomended for Qloud/YP.
+         *
+         * Starts thread for updating of in-memory cache in background
+         * Reads cache from disk if specified
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+
+        /*!
+         * Feel free to use custom updating logic in tests
+         */
+        TTvmClient(TAsyncUpdaterPtr updater);
+
+        TTvmClient(TTvmClient&&);
+        ~TTvmClient();
+        TTvmClient& operator=(TTvmClient&&);
+
+        /*!
+         * You should trigger your monitoring if status is not Ok.
+         * It will be unable to operate if status is Error.
+         * Description: https://a.yandex-team.ru/arc/trunk/arcadia/library/cpp/tvmauth/client/README.md#high-level-interface
+         * @return Current status of client.
+         */
+        TClientStatus GetStatus() const;
+
+        /*!
+         * Some tools for monitoring
+         */
+
+        TInstant GetUpdateTimeOfPublicKeys() const;
+        TInstant GetUpdateTimeOfServiceTickets() const;
+        TInstant GetInvalidationTimeOfPublicKeys() const;
+        TInstant GetInvalidationTimeOfServiceTickets() const;
+
+        /*!
+         * Requires fetchinig options (from TClientSettings or Qloud/YP/tvmtool settings)
+         * Can throw exception if cache is invalid or wrong config
+         *
+         * Alias is local label for TvmID
+         *  which can be used to avoid this number in every checking case in code.
+         * @param dst
+         */
+        TString GetServiceTicketFor(const TClientSettings::TAlias& dst) const;
+        TString GetServiceTicketFor(const TTvmId dst) const;
+
+        /*!
+         * For TTvmApi::TClientSettings: checking must be enabled in TClientSettings
+         * Can throw exception if checking was not enabled in settings
+         *
+         * ServiceTicket contains src: you should check it by yourself with ACL
+         * @param ticket
+         */
+        TCheckedServiceTicket CheckServiceTicket(TStringBuf ticket) const;
+
+        /*!
+         * Requires blackbox enviroment (from TClientSettings or Qloud/YP/tvmtool settings)
+         * Can throw exception if checking was not enabled in settings
+         * @param ticket
+         * @param overrideEnv allowes you to override env from settings
+         */
+        TCheckedUserTicket CheckUserTicket(TStringBuf ticket, TMaybe<EBlackboxEnv> overrideEnv = {}) const;
+
+        /*!
+         * Under construction now. It is unusable.
+         * PASSP-30283
+         */
+        NRoles::TRolesPtr GetRoles() const;
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+        THolder<TServiceTicketGetter> Tickets_;
+        THolder<TServiceTicketChecker> Service_;
+        THolder<TUserTicketChecker> User_;
+        THolder<TSrcChecker> SrcChecker_;
+        THolder<TDefaultUidChecker> DefaultUidChecker_;
+
+        friend class NInternal::TClientCaningKnife;
+    };
+}
diff --git a/library/cpp/tvmauth/client/logger.cpp b/library/cpp/tvmauth/client/logger.cpp
new file mode 100644
index 00000000000..bd63773cdfe
--- /dev/null
+++ b/library/cpp/tvmauth/client/logger.cpp
@@ -0,0 +1,12 @@
+#include "logger.h"
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+
+namespace NTvmAuth {
+    void TCerrLogger::Log(int lvl, const TString& msg) {
+        if (lvl > Level_)
+            return;
+        Cerr << TInstant::Now().ToStringLocal() << " lvl=" << lvl << " msg: " << msg << "\n";
+    }
+}
diff --git a/library/cpp/tvmauth/client/logger.h b/library/cpp/tvmauth/client/logger.h
new file mode 100644
index 00000000000..6f3718a2aa3
--- /dev/null
+++ b/library/cpp/tvmauth/client/logger.h
@@ -0,0 +1,59 @@
+#pragma once
+
+#include <util/generic/ptr.h>
+
+namespace NTvmAuth {
+    class ILogger: public TAtomicRefCount<ILogger> {
+    public:
+        virtual ~ILogger() = default;
+
+        void Debug(const TString& msg) {
+            Log(7, msg);
+        }
+
+        void Info(const TString& msg) {
+            Log(6, msg);
+        }
+
+        void Warning(const TString& msg) {
+            Log(4, msg);
+        }
+
+        void Error(const TString& msg) {
+            Log(3, msg);
+        }
+
+    protected:
+        /*!
+         * Log event
+         * @param lvl is syslog level: 0(Emergency) ... 7(Debug)
+         * @param msg
+         */
+        virtual void Log(int lvl, const TString& msg) = 0;
+    };
+
+    class TCerrLogger: public ILogger {
+    public:
+        TCerrLogger(int level)
+            : Level_(level)
+        {
+        }
+
+        void Log(int lvl, const TString& msg) override;
+
+    private:
+        const int Level_;
+    };
+
+    using TLoggerPtr = TIntrusivePtr<ILogger>;
+
+    class TDevNullLogger: public ILogger {
+    public:
+        static TLoggerPtr IAmBrave() {
+            return MakeIntrusive<TDevNullLogger>();
+        }
+
+        void Log(int, const TString&) override {
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp
new file mode 100644
index 00000000000..6ec15c0e88b
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.cpp
@@ -0,0 +1,126 @@
+#include "tvm_client.h"
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth::NDynamicClient {
+    TAsyncUpdaterPtr TTvmClient::Create(const NTvmApi::TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TTvmClient> p(new TTvmClient(settings, std::move(logger)));
+        p->Init();
+        p->StartWorker();
+        return p.Release();
+    }
+
+    NThreading::TFuture<TAddResponse> TTvmClient::Add(TDsts&& dsts) {
+        if (dsts.empty()) {
+            LogDebug("Adding dst: got empty task");
+            return NThreading::MakeFuture<TAddResponse>(TAddResponse{});
+        }
+
+        const size_t size = dsts.size();
+        const ui64 id = ++TaskIds_;
+        NThreading::TPromise<TAddResponse> promise = NThreading::NewPromise<TAddResponse>();
+
+        TaskQueue_.Enqueue(TTask{id, promise, std::move(dsts)});
+
+        LogDebug(TStringBuilder() << "Adding dst: got task #" << id << " with " << size << " dsts");
+        return promise.GetFuture();
+    }
+
+    std::optional<TString> TTvmClient::GetOptionalServiceTicketFor(const TTvmId dst) {
+        TServiceTicketsPtr tickets = GetCachedServiceTickets();
+        Y_ENSURE_EX(tickets,
+                    TBrokenTvmClientSettings()
+                        << "Need to enable fetching of service tickets in settings");
+
+        auto it = tickets->TicketsById.find(dst);
+        if (it != tickets->TicketsById.end()) {
+            return it->second;
+        }
+
+        it = tickets->ErrorsById.find(dst);
+        if (it != tickets->ErrorsById.end()) {
+            ythrow TMissingServiceTicket()
+                << "Failed to get ticket for '" << dst << "': "
+                << it->second;
+        }
+
+        return {};
+    }
+
+    TTvmClient::TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger)
+        : TBase(settings, logger)
+    {
+    }
+
+    TTvmClient::~TTvmClient() {
+        TBase::StopWorker();
+    }
+
+    void TTvmClient::Worker() {
+        TBase::Worker();
+        ProcessTasks();
+    }
+
+    void TTvmClient::ProcessTasks() {
+        TaskQueue_.DequeueAll(&Tasks_);
+        if (Tasks_.empty()) {
+            return;
+        }
+
+        TDsts required;
+        for (const TTask& task : Tasks_) {
+            for (const auto& dst : task.Dsts) {
+                required.insert(dst);
+            }
+        }
+
+        TServiceTicketsPtr cache = UpdateMissingServiceTickets(required);
+
+        for (TTask& task : Tasks_) {
+            try {
+                SetResponseForTask(task, *cache);
+            } catch (const std::exception& e) {
+                LogError(TStringBuilder()
+                         << "Adding dst: task #" << task.Id << ": exception: " << e.what());
+            } catch (...) {
+                LogError(TStringBuilder()
+                         << "Adding dst: task #" << task.Id << ": exception: " << CurrentExceptionMessage());
+            }
+        }
+
+        Tasks_.clear();
+    }
+
+    static const TString UNKNOWN = "Unknown reason";
+    void TTvmClient::SetResponseForTask(TTvmClient::TTask& task, const TServiceTickets& cache) {
+        if (task.Promise.HasValue()) {
+            LogWarning(TStringBuilder() << "Adding dst: task #" << task.Id << " already has value");
+            return;
+        }
+
+        TAddResponse response;
+
+        for (const auto& dst : task.Dsts) {
+            if (cache.TicketsById.contains(dst.Id)) {
+                AddDstToSettings(dst);
+                response.emplace(dst, TDstResponse{EDstStatus::Success, TString()});
+
+                LogDebug(TStringBuilder() << "Adding dst: task #" << task.Id
+                                          << ": dst=" << dst.Id << " got ticket");
+                continue;
+            }
+
+            auto it = cache.ErrorsById.find(dst.Id);
+            const TString& error = it == cache.ErrorsById.end() ? UNKNOWN : it->second;
+            response.emplace(dst, TDstResponse{EDstStatus::Fail, error});
+
+            LogWarning(TStringBuilder() << "Adding dst: task #" << task.Id
+                                        << ": dst=" << dst.Id
+                                        << " failed to get ticket: " << error);
+        }
+
+        LogDebug(TStringBuilder() << "Adding dst: task #" << task.Id << ": set value");
+        task.Promise.SetValue(std::move(response));
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h
new file mode 100644
index 00000000000..58ed953b632
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h
@@ -0,0 +1,60 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/threading/future/future.h>
+
+#include <util/generic/map.h>
+#include <util/thread/lfqueue.h>
+
+#include <optional>
+
+namespace NTvmAuth::NDynamicClient {
+    enum class EDstStatus {
+        Success,
+        Fail,
+    };
+
+    struct TDstResponse {
+        EDstStatus Status = EDstStatus::Fail;
+        TString Error;
+
+        bool operator==(const TDstResponse& o) const {
+            return Status == o.Status && Error == o.Error;
+        }
+    };
+
+    using TDsts = NTvmApi::TDstSet;
+    using TAddResponse = TMap<NTvmApi::TClientSettings::TDst, TDstResponse>;
+
+    class TTvmClient: public NTvmApi::TThreadedUpdater {
+    public:
+        static TAsyncUpdaterPtr Create(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+        virtual ~TTvmClient();
+
+        NThreading::TFuture<TAddResponse> Add(TDsts&& dsts);
+        std::optional<TString> GetOptionalServiceTicketFor(const TTvmId dst);
+
+    protected: // for tests
+        struct TTask {
+            ui64 Id = 0;
+            NThreading::TPromise<TAddResponse> Promise;
+            TDsts Dsts;
+        };
+
+        using TBase = NTvmApi::TThreadedUpdater;
+
+    protected: // for tests
+        TTvmClient(const NTvmApi::TClientSettings& settings, TLoggerPtr logger);
+
+        void Worker() override;
+        void ProcessTasks();
+
+        void SetResponseForTask(TTask& task, const TServiceTickets& cache);
+
+    private:
+        std::atomic<ui64> TaskIds_ = {0};
+        TLockFreeQueue<TTask> TaskQueue_;
+        TVector<TTask> Tasks_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp
new file mode 100644
index 00000000000..89403c15e4e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/tvm_client_ut.cpp
@@ -0,0 +1,635 @@
+#include <library/cpp/tvmauth/client/misc/api/dynamic_dst/tvm_client.h>
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+#include <regex>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NDynamicClient;
+
+Y_UNIT_TEST_SUITE(DynamicClient) {
+    static const std::regex TIME_REGEX(R"(\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d.\d{6}Z)");
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void WriteFile(TString name, TStringBuf body, TInstant time) {
+        NFs::Remove(CACHE_DIR + name);
+        TFileOutput f(CACHE_DIR + name);
+        f << TDiskWriter::PrepareData(time, body);
+    }
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    class TLogger: public NTvmAuth::ILogger {
+    public:
+        void Log(int lvl, const TString& msg) override {
+            Cout << TInstant::Now() << " lvl=" << lvl << " msg: " << msg << "\n";
+            Stream << lvl << ": " << msg << Endl;
+        }
+
+        TStringStream Stream;
+    };
+
+    class TOfflineUpdater: public NDynamicClient::TTvmClient {
+    public:
+        TOfflineUpdater(const NTvmApi::TClientSettings& settings,
+                        TIntrusivePtr<TLogger> l,
+                        bool fail = true,
+                        std::vector<TString> tickets = {})
+            : TTvmClient(settings, l)
+            , Fail(fail)
+            , Tickets(std::move(tickets))
+        {
+            Init();
+            ExpBackoff_.SetEnabled(false);
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString& req) const override {
+            if (Fail) {
+                throw yexception() << "tickets: alarm";
+            }
+
+            TString response;
+            if (!Tickets.empty()) {
+                response = Tickets.front();
+                Tickets.erase(Tickets.begin());
+            }
+
+            Cout << "*** FetchServiceTicketsFromHttp. request: " << req << ". response: " << response << Endl;
+            return {200, {}, "/2/ticket", response, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (Fail) {
+                throw yexception() << "keysalarm";
+            }
+            Cout << "*** FetchPublicKeysFromHttp" << Endl;
+            return {200, {}, "/2/keys", PublicKeys, ""};
+        }
+
+        using TTvmClient::GetDsts;
+        using TTvmClient::ProcessTasks;
+        using TTvmClient::SetResponseForTask;
+        using TTvmClient::Worker;
+
+        bool Fail = true;
+        TString PublicKeys = NUnittest::TVMKNIFE_PUBLIC_KEYS;
+        mutable std::vector<TString> Tickets;
+    };
+
+    Y_UNIT_TEST(StartWithIncompleteTicketsSet) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}}, false);
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213"  : { "error" : "some error"}})",
+                                       R"({"123"  : { "ticket" : "service_ticket_3"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+        }
+    }
+
+    Y_UNIT_TEST(StartWithEmptyTicketsSet) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"kolmo", 213}}, false);
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213"  : { "error" : "some error"}})",
+                                       R"({"123"  : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEHs:CcafYQH-FF5XaXMuJrgLZj98bIC54cs1ZkcFS9VV_9YM9iOM_0PXCtMkdg85rFjxE_BMpg7bE8ZuoqNfdw0FPt0BAKNeISwlydj4o0IjY82--LZBpP8CRn-EpAnkRaDShdlfrcF2pk1SSmEX8xdyZVQEnkUPY0cHGlFnu231vnE"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::IncompleteTicketsSet, client.GetStatus());
+
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(213), TMissingServiceTicket, "some error");
+        }
+    };
+    Y_UNIT_TEST(StartWithIncompleteCacheAndAdd) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ServiceTickets: tickets: alarm");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to get ServiceTickets: tickets: alarm\n"
+                << "4: Failed to update service tickets: tickets: alarm\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        l->Stream.Str().clear();
+
+        {
+            TOfflineUpdater client(s,
+                                   l,
+                                   false,
+                                   {
+                                       R"({"213" : { "ticket" : "service_ticket_2"}})",
+                                       R"({"123"  : { "ticket" : "service_ticket_3"}})",
+                                   });
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+
+            NThreading::TFuture<TAddResponse> fut = client.Add({123});
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 2\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: got task #1 with 1 dsts\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAdd) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({"123"  : { "ticket" : "service_ticket_3"}, "213" : { "ticket" : "service_ticket_2"}})",
+            };
+            NThreading::TFuture<TAddResponse> fut = client.Add({123, 213});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut.HasValue());
+            TAddResponse resp{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp, fut.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAddSeveral) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({"123"  : { "ticket" : "service_ticket_3"}, "213" : { "ticket" : "service_ticket_2"}})",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 1 dsts\n"
+                << "7: Adding dst: got task #2 with 1 dsts\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "7: Adding dst: task #2: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheAndAddSeveralWithErrors) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            UNIT_ASSERT(client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX",
+                                     *client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT(!client.GetOptionalServiceTicketFor(456));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({
+                    "123"  : { "ticket" : "service_ticket_3"},
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "456"  : { "error" : "error_3"}
+                })",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123, 213});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213, 456});
+
+            client.Worker();
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(456));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(456));
+
+            UNIT_ASSERT(client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX",
+                                     *client.GetOptionalServiceTicketFor(19));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(client.GetOptionalServiceTicketFor(456),
+                                           TMissingServiceTicket,
+                                           "Failed to get ticket for '456': error_3");
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+                {456, {EDstStatus::Fail, "error_3"}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Adding dst: got task #2 with 2 dsts\n"
+                << "7: Response with service tickets for 3 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 3 destination(s)\n"
+                << "3: Failed to get service ticket for dst=456: error_3\n"
+                << "6: Cache was partly updated with 2 service ticket(s). total: 3\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "4: Adding dst: task #2: dst=456 failed to get ticket: error_3\n"
+                << "7: Adding dst: task #2: set value\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(WithException) {
+        TInstant now = TInstant::Now();
+        CleanCache();
+        WriteFile("./service_tickets",
+                  R"({"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})"
+                  "\t100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater client(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+
+            client.Fail = false;
+            client.Tickets = {
+                R"({
+                    "123"  : { "ticket" : "service_ticket_3"},
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "456"  : { "error" : "error_3"},
+                    "789" : { "ticket" : "service_ticket_4"}
+                })",
+            };
+            NThreading::TFuture<TAddResponse> fut1 = client.Add({123, 213});
+            NThreading::TFuture<TAddResponse> fut2 = client.Add({213, 456});
+            NThreading::TFuture<TAddResponse> fut3 = client.Add({789});
+
+            fut2.Subscribe([](const auto&) {
+                throw yexception() << "planed exc";
+            });
+            fut3.Subscribe([](const auto&) {
+                throw 5;
+            });
+
+            UNIT_ASSERT_NO_EXCEPTION(client.Worker());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, client.GetStatus());
+
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(19));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(213));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->TicketsById.contains(123));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->TicketsById.contains(456));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(19));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(213));
+            UNIT_ASSERT(!client.GetCachedServiceTickets()->ErrorsById.contains(123));
+            UNIT_ASSERT(client.GetCachedServiceTickets()->ErrorsById.contains(456));
+
+            UNIT_ASSERT(fut1.HasValue());
+            TAddResponse resp1{
+                {123, {EDstStatus::Success, ""}},
+                {213, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp1, fut1.GetValue());
+
+            UNIT_ASSERT(fut2.HasValue());
+            TAddResponse resp2{
+                {213, {EDstStatus::Success, ""}},
+                {456, {EDstStatus::Fail, "error_3"}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp2, fut2.GetValue());
+
+            UNIT_ASSERT(fut3.HasValue());
+            TAddResponse resp3{
+                {789, {EDstStatus::Success, ""}},
+            };
+            UNIT_ASSERT_VALUES_EQUAL(resp3, fut3.GetValue());
+
+            UNIT_ASSERT(client.Tickets.empty());
+
+            TDsts dsts{19, 123, 213, 789};
+            UNIT_ASSERT_VALUES_EQUAL(dsts, client.GetDsts());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Adding dst: got task #1 with 2 dsts\n"
+                << "7: Adding dst: got task #2 with 2 dsts\n"
+                << "7: Adding dst: got task #3 with 1 dsts\n"
+                << "7: Response with service tickets for 4 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 4 destination(s)\n"
+                << "3: Failed to get service ticket for dst=456: error_3\n"
+                << "6: Cache was partly updated with 3 service ticket(s). total: 4\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Adding dst: task #1: dst=123 got ticket\n"
+                << "7: Adding dst: task #1: dst=213 got ticket\n"
+                << "7: Adding dst: task #1: set value\n"
+                << "7: Adding dst: task #2: dst=213 got ticket\n"
+                << "4: Adding dst: task #2: dst=456 failed to get ticket: error_3\n"
+                << "7: Adding dst: task #2: set value\n"
+                << "3: Adding dst: task #2: exception: planed exc\n"
+                << "7: Adding dst: task #3: dst=789 got ticket\n"
+                << "7: Adding dst: task #3: set value\n"
+                << "3: Adding dst: task #3: exception: unknown error\n",
+            l->Stream.Str());
+    }
+}
+
+template <>
+void Out<NTvmAuth::NDynamicClient::TDstResponse>(IOutputStream& out, const NTvmAuth::NDynamicClient::TDstResponse& m) {
+    out << m.Status << " (" << m.Error << ")";
+}
+
+template <>
+void Out<NTvmAuth::NTvmApi::TClientSettings::TDst>(IOutputStream& out, const NTvmAuth::NTvmApi::TClientSettings::TDst& m) {
+    out << m.Id;
+}
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/ya.make b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/ya.make
new file mode 100644
index 00000000000..5d01ffaad87
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ut/ya.make
@@ -0,0 +1,11 @@
+UNITTEST_FOR(library/cpp/tvmauth/client/misc/api/dynamic_dst)
+
+OWNER(g:passport_infra)
+
+SRCS(
+    tvm_client_ut.cpp
+)
+
+ENV(YA_TEST_SHORTEN_WINE_PATH=1)
+
+END()
diff --git a/library/cpp/tvmauth/client/misc/api/dynamic_dst/ya.make b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ya.make
new file mode 100644
index 00000000000..f3858e602f7
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/dynamic_dst/ya.make
@@ -0,0 +1,20 @@
+LIBRARY()
+
+OWNER(g:passport_infra)
+
+PEERDIR(
+    library/cpp/threading/future
+    library/cpp/tvmauth/client
+)
+
+SRCS(
+    tvm_client.cpp
+)
+
+GENERATE_ENUM_SERIALIZATION(tvm_client.h)
+
+END()
+
+RECURSE_FOR_TESTS(
+    ut
+)
diff --git a/library/cpp/tvmauth/client/misc/api/retry_settings.h b/library/cpp/tvmauth/client/misc/api/retry_settings.h
new file mode 100644
index 00000000000..607b2308112
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/retry_settings.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/exponential_backoff.h>
+
+namespace NTvmAuth::NTvmApi {
+    struct TRetrySettings {
+        TExponentialBackoff::TSettings BackoffSettings = {
+            TDuration::Seconds(0),
+            TDuration::Minutes(1),
+            2,
+            0.5,
+        };
+        TDuration MaxRandomSleepDefault = TDuration::Seconds(5);
+        TDuration MaxRandomSleepWhenOk = TDuration::Minutes(1);
+        ui32 RetriesOnStart = 3;
+        ui32 RetriesInBackground = 2;
+        TDuration WorkerAwakingPeriod = TDuration::Seconds(10);
+        ui32 DstsLimit = 300;
+        TDuration RolesUpdatePeriod = TDuration::Minutes(10);
+        TDuration RolesWarnPeriod = TDuration::Minutes(20);
+
+        bool operator==(const TRetrySettings& o) const {
+            return BackoffSettings == o.BackoffSettings &&
+                   MaxRandomSleepDefault == o.MaxRandomSleepDefault &&
+                   MaxRandomSleepWhenOk == o.MaxRandomSleepWhenOk &&
+                   RetriesOnStart == o.RetriesOnStart &&
+                   WorkerAwakingPeriod == o.WorkerAwakingPeriod &&
+                   DstsLimit == o.DstsLimit &&
+                   RolesUpdatePeriod == o.RolesUpdatePeriod &&
+                   RolesWarnPeriod == o.RolesWarnPeriod;
+        }
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp b/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp
new file mode 100644
index 00000000000..b46595207c0
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/roles_fetcher.cpp
@@ -0,0 +1,163 @@
+#include "roles_fetcher.h"
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/roles/decoder.h>
+#include <library/cpp/tvmauth/client/misc/roles/parser.h>
+
+#include <library/cpp/string_utils/quote/quote.h>
+
+#include <util/string/builder.h>
+#include <util/string/join.h>
+
+namespace NTvmAuth::NTvmApi {
+    static TString CreatePath(const TString& dir, const TString& file) {
+        return dir.EndsWith("/")
+                   ? dir + file
+                   : dir + "/" + file;
+    }
+
+    TRolesFetcher::TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger)
+        : Settings_(settings)
+        , Logger_(logger)
+        , CacheFilePath_(CreatePath(Settings_.CacheDir, "roles"))
+    {
+        Client_ = std::make_unique<TKeepAliveHttpClient>(
+            Settings_.TiroleHost,
+            Settings_.TirolePort,
+            Settings_.Timeout,
+            Settings_.Timeout);
+    }
+
+    TInstant TRolesFetcher::ReadFromDisk() {
+        TDiskReader dr(CacheFilePath_, Logger_.Get());
+        if (!dr.Read()) {
+            return {};
+        }
+
+        std::pair<TString, TString> data = ParseDiskFormat(dr.Data());
+        if (data.second != Settings_.IdmSystemSlug) {
+            Logger_->Warning(
+                TStringBuilder() << "Roles in disk cache are for another slug (" << data.second
+                                 << "). Self=" << Settings_.IdmSystemSlug);
+            return {};
+        }
+
+        CurrentRoles_.Set(NRoles::TParser::Parse(std::make_shared<TString>(std::move(data.first))));
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to read roles with revision "
+                             << CurrentRoles_.Get()->GetMeta().Revision
+                             << " from " << CacheFilePath_);
+
+        return dr.Time();
+    }
+
+    bool TRolesFetcher::AreRolesOk() const {
+        return bool(GetCurrentRoles());
+    }
+
+    bool TRolesFetcher::IsTimeToUpdate(const TRetrySettings& settings, TDuration sinceUpdate) {
+        return settings.RolesUpdatePeriod < sinceUpdate;
+    }
+
+    bool TRolesFetcher::ShouldWarn(const TRetrySettings& settings, TDuration sinceUpdate) {
+        return settings.RolesWarnPeriod < sinceUpdate;
+    }
+
+    NUtils::TFetchResult TRolesFetcher::FetchActualRoles(const TString& serviceTicket) {
+        TStringStream out;
+        THttpHeaders outHeaders;
+
+        TRequest req = CreateTiroleRequest(serviceTicket);
+        TKeepAliveHttpClient::THttpCode code = Client_->DoGet(
+            req.Url,
+            &out,
+            req.Headers,
+            &outHeaders);
+
+        const THttpInputHeader* reqId = outHeaders.FindHeader("X-Request-Id");
+
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to perform request for roles to " << Settings_.TiroleHost
+                             << " (request_id=" << (reqId ? reqId->Value() : "")
+                             << "). code=" << code);
+
+        return {code, std::move(outHeaders), "/v1/get_actual_roles", out.Str(), {}};
+    }
+
+    void TRolesFetcher::Update(NUtils::TFetchResult&& fetchResult, TInstant now) {
+        if (fetchResult.Code == 304) {
+            Y_ENSURE(CurrentRoles_.Get(),
+                     "tirole did not return any roles because current roles are actual,"
+                     " but there are no roles in memory - this should never happen");
+            return;
+        }
+
+        Y_ENSURE(fetchResult.Code == 200,
+                 "Unexpected code from tirole: " << fetchResult.Code << ". " << fetchResult.Response);
+
+        const THttpInputHeader* codec = fetchResult.Headers.FindHeader("X-Tirole-Compression");
+        const TStringBuf codecBuf = codec ? codec->Value() : "";
+
+        NRoles::TRawPtr blob;
+        try {
+            blob = std::make_shared<TString>(NRoles::TDecoder::Decode(
+                codecBuf,
+                std::move(fetchResult.Response)));
+        } catch (const std::exception& e) {
+            throw yexception() << "Failed to decode blob with codec '" << codecBuf
+                               << "': " << e.what();
+        }
+
+        CurrentRoles_.Set(NRoles::TParser::Parse(blob));
+
+        Logger_->Debug(
+            TStringBuilder() << "Succeed to update roles with revision "
+                             << CurrentRoles_.Get()->GetMeta().Revision);
+
+        TDiskWriter dw(CacheFilePath_, Logger_.Get());
+        dw.Write(PrepareDiskFormat(*blob, Settings_.IdmSystemSlug), now);
+    }
+
+    NTvmAuth::NRoles::TRolesPtr TRolesFetcher::GetCurrentRoles() const {
+        return CurrentRoles_.Get();
+    }
+
+    void TRolesFetcher::ResetConnection() {
+        Client_->ResetConnection();
+    }
+
+    static const char DELIMETER = '\t';
+
+    std::pair<TString, TString> TRolesFetcher::ParseDiskFormat(TStringBuf filebody) {
+        TStringBuf slug = filebody.RNextTok(DELIMETER);
+        return {TString(filebody), CGIUnescapeRet(slug)};
+    }
+
+    TString TRolesFetcher::PrepareDiskFormat(TStringBuf roles, TStringBuf slug) {
+        TStringStream res;
+        res.Reserve(roles.size() + 1 + slug.size());
+        res << roles << DELIMETER << CGIEscapeRet(slug);
+        return res.Str();
+    }
+
+    TRolesFetcher::TRequest TRolesFetcher::CreateTiroleRequest(const TString& serviceTicket) const {
+        TRolesFetcher::TRequest res;
+
+        TStringStream url;
+        url.Reserve(512);
+        url << "/v1/get_actual_roles?";
+        url << "system_slug=" << CGIEscapeRet(Settings_.IdmSystemSlug) << "&";
+        Settings_.ProcInfo.AddToRequest(url);
+        res.Url = std::move(url.Str());
+
+        res.Headers.reserve(2);
+        res.Headers.emplace(XYaServiceTicket_, serviceTicket);
+
+        NRoles::TRolesPtr roles = CurrentRoles_.Get();
+        if (roles) {
+            res.Headers.emplace(IfNoneMatch_, Join("", "\"", roles->GetMeta().Revision, "\""));
+        }
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/roles_fetcher.h b/library/cpp/tvmauth/client/misc/api/roles_fetcher.h
new file mode 100644
index 00000000000..63691223b50
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/roles_fetcher.h
@@ -0,0 +1,63 @@
+#pragma once
+
+#include "retry_settings.h"
+
+#include <library/cpp/tvmauth/client/misc/fetch_result.h>
+#include <library/cpp/tvmauth/client/misc/proc_info.h>
+#include <library/cpp/tvmauth/client/misc/utils.h>
+#include <library/cpp/tvmauth/client/misc/roles/roles.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NTvmApi {
+    struct TRolesFetcherSettings {
+        TString TiroleHost;
+        ui16 TirolePort = 0;
+        TString CacheDir;
+        NUtils::TProcInfo ProcInfo;
+        TTvmId SelfTvmId = 0;
+        TString IdmSystemSlug;
+        TDuration Timeout = TDuration::Seconds(30);
+    };
+
+    class TRolesFetcher {
+    public:
+        TRolesFetcher(const TRolesFetcherSettings& settings, TLoggerPtr logger);
+
+        TInstant ReadFromDisk();
+
+        bool AreRolesOk() const;
+        static bool IsTimeToUpdate(const TRetrySettings& settings, TDuration sinceUpdate);
+        static bool ShouldWarn(const TRetrySettings& settings, TDuration sinceUpdate);
+
+        NUtils::TFetchResult FetchActualRoles(const TString& serviceTicket);
+        void Update(NUtils::TFetchResult&& fetchResult, TInstant now = TInstant::Now());
+
+        NTvmAuth::NRoles::TRolesPtr GetCurrentRoles() const;
+
+        void ResetConnection();
+
+    public:
+        static std::pair<TString, TString> ParseDiskFormat(TStringBuf filebody);
+        static TString PrepareDiskFormat(TStringBuf roles, TStringBuf slug);
+
+        struct TRequest {
+            TString Url;
+            TKeepAliveHttpClient::THeaders Headers;
+        };
+        TRequest CreateTiroleRequest(const TString& serviceTicket) const;
+
+    private:
+        const TRolesFetcherSettings Settings_;
+        const TLoggerPtr Logger_;
+        const TString CacheFilePath_;
+        const TString XYaServiceTicket_ = "X-Ya-Service-Ticket";
+        const TString IfNoneMatch_ = "If-None-Match";
+
+        NUtils::TProtectedValue<NTvmAuth::NRoles::TRolesPtr> CurrentRoles_;
+
+        std::unique_ptr<TKeepAliveHttpClient> Client_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/settings.cpp b/library/cpp/tvmauth/client/misc/api/settings.cpp
new file mode 100644
index 00000000000..71aad75998c
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/settings.cpp
@@ -0,0 +1,89 @@
+#include "settings.h"
+
+#include <util/datetime/base.h>
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+#include <set>
+
+namespace NTvmAuth::NTvmApi {
+    void TClientSettings::CheckPermissions(const TString& dir) {
+        const TString name = dir + "/check.tmp";
+
+        try {
+            NFs::EnsureExists(dir);
+
+            TFile file(name, CreateAlways | RdWr);
+
+            NFs::Remove(name);
+        } catch (const std::exception& e) {
+            NFs::Remove(name);
+            ythrow TPermissionDenied() << "Permission denied to disk cache directory: " << e.what();
+        }
+    }
+
+    void TClientSettings::CheckValid() const {
+        if (DiskCacheDir) {
+            CheckPermissions(DiskCacheDir);
+        }
+
+        if (TStringBuf(Secret)) {
+            Y_ENSURE_EX(NeedServiceTicketsFetching(),
+                        TBrokenTvmClientSettings() << "Secret is present but destinations list is empty. It makes no sense");
+        }
+        if (NeedServiceTicketsFetching()) {
+            Y_ENSURE_EX(SelfTvmId != 0,
+                        TBrokenTvmClientSettings() << "SelfTvmId cannot be 0 if fetching of Service Tickets required");
+            Y_ENSURE_EX((TStringBuf)Secret,
+                        TBrokenTvmClientSettings() << "Secret is required for fetching of Service Tickets");
+        }
+
+        if (CheckServiceTickets) {
+            Y_ENSURE_EX(SelfTvmId != 0,
+                        TBrokenTvmClientSettings() << "SelfTvmId cannot be 0 if checking of Service Tickets required");
+        }
+
+        if (FetchRolesForIdmSystemSlug) {
+            Y_ENSURE_EX(DiskCacheDir,
+                        TBrokenTvmClientSettings() << "Disk cache must be enabled to use roles: "
+                                                      "they can be heavy");
+        }
+
+        bool needSmth = NeedServiceTicketsFetching() ||
+                        IsServiceTicketCheckingRequired() ||
+                        IsUserTicketCheckingRequired();
+        Y_ENSURE_EX(needSmth, TBrokenTvmClientSettings() << "Invalid settings: nothing to do");
+
+        // Useless now: keep it here to avoid forgetting check from TDst. TODO: PASSP-35377
+        for (const auto& dst : FetchServiceTicketsForDsts) {
+            Y_ENSURE_EX(dst.Id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+        }
+        // TODO: check only FetchServiceTicketsForDsts_
+        // Python binding checks settings before normalization
+        for (const auto& [alias, dst] : FetchServiceTicketsForDstsWithAliases) {
+            Y_ENSURE_EX(dst.Id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+        }
+        Y_ENSURE_EX(TiroleTvmId != 0, TBrokenTvmClientSettings() << "TiroleTvmId cannot be 0");
+    }
+
+    TClientSettings TClientSettings::CloneNormalized() const {
+        TClientSettings res = *this;
+
+        std::set<TTvmId> allDsts;
+        for (const auto& tvmid : res.FetchServiceTicketsForDsts) {
+            allDsts.insert(tvmid.Id);
+        }
+        for (const auto& [alias, tvmid] : res.FetchServiceTicketsForDstsWithAliases) {
+            allDsts.insert(tvmid.Id);
+        }
+        if (FetchRolesForIdmSystemSlug) {
+            allDsts.insert(res.TiroleTvmId);
+        }
+
+        res.FetchServiceTicketsForDsts = {allDsts.begin(), allDsts.end()};
+
+        res.CheckValid();
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/settings.h b/library/cpp/tvmauth/client/misc/api/settings.h
new file mode 100644
index 00000000000..715ab3e02c2
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/settings.h
@@ -0,0 +1,302 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/settings.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/type.h>
+
+#include <library/cpp/string_utils/secret_string/secret_string.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/hash.h>
+#include <util/generic/maybe.h>
+
+namespace NTvmAuth::NTvmApi {
+    /**
+     * Settings for TVM client. Uses https://tvm-api.yandex.net to get state.
+     * At least one of them is required:
+     *     FetchServiceTicketsForDsts_/FetchServiceTicketsForDstsWithAliases_
+     *     CheckServiceTickets_
+     *     CheckUserTicketsWithBbEnv_
+     */
+    class TClientSettings: public NTvmAuth::TClientSettings {
+    public:
+        class TDst;
+
+        /**
+         * Alias is an internal name for destinations within your code.
+         *  You can associate a name with an tvm_id once in your code and use the name as an alias for
+         *  tvm_id to each calling point. Useful for several environments: prod/test/etc.
+         * @example:
+         *      // init
+         *      static const TString MY_BACKEND = "my backend";
+         *      TDstMap map = {{MY_BACKEND, TDst(config.get("my_back_tvm_id"))}};
+         *      ...
+         *      // per request
+         *      TString t = tvmClient.GetServiceTicket(MY_BACKEND);
+         */
+        using TDstMap = THashMap<TAlias, TDst>;
+        using TDstVector = TVector<TDst>;
+
+    public:
+        /*!
+         * NOTE: Please use this option: it provides the best reliability
+         * NOTE: Client requires read/write permissions
+         * WARNING: The same directory can be used only:
+         *            - for TVM clients with the same settings
+         *          OR
+         *            - for new client replacing previous - with another config.
+         *          System user must be the same for processes with these clients inside.
+         *          Implementation doesn't provide other scenarios.
+         */
+        TString DiskCacheDir;
+
+        // Required for Service Ticket fetching or checking
+        TTvmId SelfTvmId = 0;
+
+        // Options for Service Tickets fetching
+        NSecretString::TSecretString Secret;
+        /*!
+         * Client will process both attrs:
+         *   FetchServiceTicketsForDsts_, FetchServiceTicketsForDstsWithAliases_
+         * WARNING: It is not way to provide authorization for incoming ServiceTickets!
+         *          It is way only to send your ServiceTickets to your backend!
+         */
+        TDstVector FetchServiceTicketsForDsts;
+        TDstMap FetchServiceTicketsForDstsWithAliases;
+        bool IsIncompleteTicketsSetAnError = true;
+
+        // Options for Service Tickets checking
+        bool CheckServiceTickets = false;
+
+        // Options for User Tickets checking
+        TMaybe<EBlackboxEnv> CheckUserTicketsWithBbEnv;
+
+        // Options for roles fetching
+        TString FetchRolesForIdmSystemSlug;
+        /*!
+         * By default client checks src from ServiceTicket or default uid from UserTicket -
+         *   to prevent you from forgetting to check it yourself.
+         * It does binary checks only:
+         *   ticket gets status NoRoles, if there is no role for src or default uid.
+         * You need to check roles on your own if you have a non-binary role system or
+         *     you have disabled ShouldCheckSrc/ShouldCheckDefaultUid
+         *
+         * You may need to disable this check in the following cases:
+         *   - You use GetRoles() to provide verbose message (with revision).
+         *     Double check may be inconsistent:
+         *       binary check inside client uses revision of roles X - i.e. src 100500 has no role,
+         *       exact check in your code uses revision of roles Y -  i.e. src 100500 has some roles.
+         */
+        bool ShouldCheckSrc = true;
+        bool ShouldCheckDefaultUid = true;
+
+        // Options for tests
+        TString TvmHost = "https://tvm-api.yandex.net";
+        ui16 TvmPort = 443;
+        TString TiroleHost = "https://tirole-api.yandex.net";
+        TDuration TvmSocketTimeout = TDuration::Seconds(5);
+        TDuration TvmConnectTimeout = TDuration::Seconds(30);
+        ui16 TirolePort = 443;
+        TTvmId TiroleTvmId = TIROLE_TVMID;
+
+        // for debug purposes
+        TString LibVersionPrefix;
+
+        void CheckValid() const;
+        TClientSettings CloneNormalized() const;
+
+        static inline const TTvmId TIROLE_TVMID = 2028120;
+        static inline const TTvmId TIROLE_TVMID_TEST = 2026536;
+
+        // DEPRECATED API
+        // TODO: get rid of it: PASSP-35377
+    public:
+        // Deprecated: set attributes directly
+        void SetSelfTvmId(TTvmId selfTvmId) {
+            SelfTvmId = selfTvmId;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketChecking() {
+            CheckServiceTickets = true;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableUserTicketChecking(EBlackboxEnv env) {
+            CheckUserTicketsWithBbEnv = env;
+        }
+
+        // Deprecated: set attributes directly
+        void SetTvmHostPort(const TString& host, ui16 port) {
+            TvmHost = host;
+            TvmPort = port;
+        }
+
+        // Deprecated: set attributes directly
+        void SetTiroleHostPort(const TString& host, ui16 port) {
+            TiroleHost = host;
+            TirolePort = port;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableRolesFetching(const TString& systemSlug, TTvmId tiroleTvmId = TIROLE_TVMID) {
+            TiroleTvmId = tiroleTvmId;
+            FetchRolesForIdmSystemSlug = systemSlug;
+        }
+
+        // Deprecated: set attributes directly
+        void DoNotCheckSrcByDefault() {
+            ShouldCheckSrc = false;
+        }
+
+        // Deprecated: set attributes directly
+        void DoNotCheckDefaultUidByDefault() {
+            ShouldCheckDefaultUid = false;
+        }
+
+        // Deprecated: set attributes directly
+        void SetDiskCacheDir(const TString& dir) {
+            DiskCacheDir = dir;
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketsFetchOptions(const TStringBuf selfSecret,
+                                              TDstMap&& dsts,
+                                              const bool considerIncompleteTicketsSetAsError = true) {
+            IsIncompleteTicketsSetAnError = considerIncompleteTicketsSetAsError;
+            Secret = selfSecret;
+
+            FetchServiceTicketsForDsts = TDstVector{};
+            FetchServiceTicketsForDsts.reserve(dsts.size());
+            for (const auto& pair : dsts) {
+                FetchServiceTicketsForDsts.push_back(pair.second);
+            }
+
+            FetchServiceTicketsForDstsWithAliases = std::move(dsts);
+        }
+
+        // Deprecated: set attributes directly
+        void EnableServiceTicketsFetchOptions(const TStringBuf selfSecret,
+                                              TDstVector&& dsts,
+                                              const bool considerIncompleteTicketsSetAsError = true) {
+            IsIncompleteTicketsSetAnError = considerIncompleteTicketsSetAsError;
+            Secret = selfSecret;
+            FetchServiceTicketsForDsts = std::move(dsts);
+        }
+
+    public:
+        bool IsServiceTicketFetchingRequired() const {
+            return bool(Secret.Value());
+        }
+
+        const TStringBuf GetSelfSecret() const {
+            return Secret;
+        }
+
+        bool HasDstAliases() const {
+            return !FetchServiceTicketsForDstsWithAliases.empty();
+        }
+
+        const TDstMap& GetDstAliases() const {
+            return FetchServiceTicketsForDstsWithAliases;
+        }
+
+        const TDstVector& GetDestinations() const {
+            return FetchServiceTicketsForDsts;
+        }
+
+        bool IsUserTicketCheckingRequired() const {
+            return bool(CheckUserTicketsWithBbEnv);
+        }
+
+        EBlackboxEnv GetEnvForUserTickets() const {
+            return *CheckUserTicketsWithBbEnv;
+        }
+
+        bool IsServiceTicketCheckingRequired() const {
+            return CheckServiceTickets;
+        }
+
+        bool IsDiskCacheUsed() const {
+            return bool(DiskCacheDir);
+        }
+
+        TString GetDiskCacheDir() const {
+            return DiskCacheDir;
+        }
+
+        TTvmId GetSelfTvmId() const {
+            return SelfTvmId;
+        }
+
+        const TString& GetLibVersionPrefix() const {
+            return LibVersionPrefix;
+        }
+
+        const TString& GetTvmHost() const {
+            return TvmHost;
+        }
+
+        ui16 GetTvmPort() const {
+            return TvmPort;
+        }
+
+        bool IsRolesFetchingEnabled() const {
+            return bool(FetchRolesForIdmSystemSlug);
+        }
+
+        TTvmId GetTiroleTvmId() const {
+            return TiroleTvmId;
+        }
+
+        const TString& GetIdmSystemSlug() const {
+            return FetchRolesForIdmSystemSlug;
+        }
+
+        const TString& GetTiroleHost() const {
+            return TiroleHost;
+        }
+
+        ui16 GetTirolePort() const {
+            return TirolePort;
+        }
+
+        bool NeedServiceTicketsFetching() const {
+            return !FetchServiceTicketsForDsts.empty() ||
+                   !FetchServiceTicketsForDstsWithAliases.empty() ||
+                   FetchRolesForIdmSystemSlug;
+        }
+
+        // TODO: get rid of TDst: PASSP-35377
+        class TDst {
+        public:
+            TDst(TTvmId id)
+                : Id(id)
+            {
+                Y_ENSURE_EX(id != 0, TBrokenTvmClientSettings() << "TvmId cannot be 0");
+            }
+
+            TTvmId Id;
+
+            bool operator==(const TDst& o) const {
+                return Id == o.Id;
+            }
+
+            bool operator<(const TDst& o) const {
+                return Id < o.Id;
+            }
+
+        public: // for python binding
+            TDst()
+                : Id(0)
+            {
+            }
+        };
+
+    public:
+        static void CheckPermissions(const TString& dir);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp
new file mode 100644
index 00000000000..a7df49c05dd
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/threaded_updater.cpp
@@ -0,0 +1,954 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/utils.h>
+#include <library/cpp/tvmauth/client/misc/retry_settings/v1/settings.pb.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/stream/str.h>
+#include <util/string/builder.h>
+#include <util/string/cast.h>
+#include <util/system/thread.h>
+
+namespace NTvmAuth::NTvmApi {
+    static TString CreatePublicKeysUrl(const TClientSettings& settings,
+                                       const NUtils::TProcInfo& procInfo) {
+        TStringStream s;
+        s << "/2/keys";
+        s << "?";
+        procInfo.AddToRequest(s);
+
+        s << "&get_retry_settings=yes";
+
+        if (settings.GetSelfTvmId() != 0) {
+            s << "&src=" << settings.GetSelfTvmId();
+        }
+
+        if (settings.IsUserTicketCheckingRequired()) {
+            s << "&env=" << static_cast<int>(settings.GetEnvForUserTickets());
+        }
+
+        return s.Str();
+    }
+
+    TAsyncUpdaterPtr TThreadedUpdater::Create(const TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TThreadedUpdater> p(new TThreadedUpdater(settings, std::move(logger)));
+        p->Init();
+        p->StartWorker();
+        return p.Release();
+    }
+
+    TThreadedUpdater::~TThreadedUpdater() {
+        ExpBackoff_.SetEnabled(false);
+        ExpBackoff_.Interrupt();
+        StopWorker(); // Required here to avoid using of deleted members
+    }
+
+    TClientStatus TThreadedUpdater::GetStatus() const {
+        const TClientStatus::ECode state = GetState();
+        return TClientStatus(state, GetLastError(state == TClientStatus::Ok || state == TClientStatus::IncompleteTicketsSet));
+    }
+
+    NRoles::TRolesPtr TThreadedUpdater::GetRoles() const {
+        Y_ENSURE_EX(RolesFetcher_,
+                    TBrokenTvmClientSettings() << "Roles were not configured in settings");
+        return RolesFetcher_->GetCurrentRoles();
+    }
+
+    TClientStatus::ECode TThreadedUpdater::GetState() const {
+        const TInstant now = TInstant::Now();
+
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            if (AreServiceTicketsInvalid(now)) {
+                return TClientStatus::Error;
+            }
+            auto tickets = GetCachedServiceTickets();
+            if (!tickets) {
+                return TClientStatus::Error;
+            }
+            if (tickets->TicketsById.size() < Destinations_.size()) {
+                if (Settings_.IsIncompleteTicketsSetAnError) {
+                    return TClientStatus::Error;
+                } else {
+                    return TClientStatus::IncompleteTicketsSet;
+                }
+            }
+        }
+        if ((Settings_.IsServiceTicketCheckingRequired() || Settings_.IsUserTicketCheckingRequired()) && ArePublicKeysInvalid(now)) {
+            return TClientStatus::Error;
+        }
+
+        const TDuration sincePublicKeysUpdate = now - GetUpdateTimeOfPublicKeys();
+        const TDuration sinceServiceTicketsUpdate = now - GetUpdateTimeOfServiceTickets();
+        const TDuration sinceRolesUpdate = now - GetUpdateTimeOfRoles();
+
+        if (Settings_.IsServiceTicketFetchingRequired() && sinceServiceTicketsUpdate > ServiceTicketsDurations_.Expiring) {
+            return TClientStatus::Warning;
+        }
+        if ((Settings_.IsServiceTicketCheckingRequired() || Settings_.IsUserTicketCheckingRequired()) &&
+            sincePublicKeysUpdate > PublicKeysDurations_.Expiring)
+        {
+            return TClientStatus::Warning;
+        }
+        if (RolesFetcher_ && TRolesFetcher::ShouldWarn(RetrySettings_, sinceRolesUpdate)) {
+            return TClientStatus::Warning;
+        }
+
+        return TClientStatus::Ok;
+    }
+
+    TThreadedUpdater::TThreadedUpdater(const TClientSettings& settings, TLoggerPtr logger)
+        : TThreadedUpdaterBase(
+              TRetrySettings{}.WorkerAwakingPeriod,
+              std::move(logger),
+              settings.GetTvmHost(),
+              settings.GetTvmPort(),
+              settings.TvmSocketTimeout,
+              settings.TvmConnectTimeout)
+        , ExpBackoff_(RetrySettings_.BackoffSettings)
+        , Settings_(settings.CloneNormalized())
+        , ProcInfo_(NUtils::TProcInfo::Create(Settings_.GetLibVersionPrefix()))
+        , PublicKeysUrl_(CreatePublicKeysUrl(Settings_, ProcInfo_))
+        , DstAliases_(MakeAliasMap(Settings_))
+        , Headers_({{"Content-Type", "application/x-www-form-urlencoded"}})
+        , Random_(TInstant::Now().MicroSeconds())
+    {
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            SigningContext_ = TServiceContext::SigningFactory(Settings_.GetSelfSecret());
+        }
+
+        if (Settings_.IsServiceTicketFetchingRequired()) {
+            Destinations_ = {Settings_.GetDestinations().begin(), Settings_.GetDestinations().end()};
+        }
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+
+        if (Settings_.IsUserTicketCheckingRequired()) {
+            SetBbEnv(Settings_.GetEnvForUserTickets());
+        }
+
+        if (Settings_.IsRolesFetchingEnabled()) {
+            RolesFetcher_ = std::make_unique<TRolesFetcher>(
+                TRolesFetcherSettings{
+                    Settings_.GetTiroleHost(),
+                    Settings_.GetTirolePort(),
+                    Settings_.GetDiskCacheDir(),
+                    ProcInfo_,
+                    Settings_.GetSelfTvmId(),
+                    Settings_.GetIdmSystemSlug(),
+                },
+                Logger_);
+        }
+
+        if (Settings_.IsDiskCacheUsed()) {
+            TString path = Settings_.GetDiskCacheDir();
+            if (path.back() != '/') {
+                path.push_back('/');
+            }
+
+            if (Settings_.IsServiceTicketFetchingRequired()) {
+                ServiceTicketsFilepath_ = path;
+                ServiceTicketsFilepath_.append("service_tickets");
+            }
+
+            if (Settings_.IsServiceTicketCheckingRequired() || Settings_.IsUserTicketCheckingRequired()) {
+                PublicKeysFilepath_ = path;
+                PublicKeysFilepath_.append("public_keys");
+            }
+
+            RetrySettingsFilepath_ = path + "retry_settings";
+        } else {
+            LogInfo("Disk cache disabled. Please set disk cache directory in settings for best reliability");
+        }
+    }
+
+    void TThreadedUpdater::Init() {
+        ReadStateFromDisk();
+        ClearErrors();
+        ExpBackoff_.SetEnabled(false);
+
+        // First of all try to get tickets: there are a lot of reasons to fail this request.
+        // As far as disk cache usually disabled, client will not fetch keys before fail on every ctor call.
+        UpdateServiceTickets();
+        if (!AreServicesTicketsOk()) {
+            ThrowLastError();
+        }
+
+        UpdatePublicKeys();
+        if (!IsServiceContextOk() || !IsUserContextOk()) {
+            ThrowLastError();
+        }
+
+        UpdateRoles();
+        if (RolesFetcher_ && !RolesFetcher_->AreRolesOk()) {
+            ThrowLastError();
+        }
+
+        Inited_ = true;
+        ExpBackoff_.SetEnabled(true);
+    }
+
+    void TThreadedUpdater::UpdateServiceTickets() {
+        if (!Settings_.IsServiceTicketFetchingRequired()) {
+            return;
+        }
+
+        TInstant stut = GetUpdateTimeOfServiceTickets();
+        try {
+            if (IsTimeToUpdateServiceTickets(stut)) {
+                UpdateAllServiceTickets();
+                NeedFetchMissingServiceTickets_ = false;
+            } else if (NeedFetchMissingServiceTickets_ && GetCachedServiceTickets()->TicketsById.size() < Destinations_.size()) {
+                UpdateMissingServiceTickets(Destinations_);
+                NeedFetchMissingServiceTickets_ = false;
+            }
+            if (AreServicesTicketsOk()) {
+                ClearError(EScope::ServiceTickets);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::ServiceTickets, e.what());
+            LogWarning(TStringBuilder() << "Failed to update service tickets: " << e.what());
+            if (TInstant::Now() - stut > ServiceTicketsDurations_.Expiring) {
+                LogError("Service tickets have not been refreshed for too long period");
+            }
+        }
+    }
+
+    void TThreadedUpdater::UpdateAllServiceTickets() {
+        THttpResult st = GetServiceTicketsFromHttp(Destinations_, RetrySettings_.DstsLimit);
+
+        auto oldCache = GetCachedServiceTickets();
+        if (oldCache) {
+            for (const auto& pair : oldCache->ErrorsById) {
+                st.TicketsWithErrors.Errors.insert(pair);
+            }
+        }
+
+        UpdateServiceTicketsCache(std::move(st.TicketsWithErrors), TInstant::Now());
+        if (ServiceTicketsFilepath_) {
+            DiskCacheServiceTickets_ = CreateJsonArray(st.Responses);
+            TDiskWriter w(ServiceTicketsFilepath_, Logger_.Get());
+            w.Write(PrepareTicketsForDisk(DiskCacheServiceTickets_, Settings_.GetSelfTvmId()));
+        }
+    }
+
+    TServiceTicketsPtr TThreadedUpdater::UpdateMissingServiceTickets(const TDstSet& required) {
+        TServiceTicketsPtr cache = GetCachedServiceTickets();
+        TClientSettings::TDstVector dsts = FindMissingDsts(cache, required);
+
+        if (dsts.empty()) {
+            return cache;
+        }
+
+        THttpResult st = GetServiceTicketsFromHttp(dsts, RetrySettings_.DstsLimit);
+
+        size_t gotTickets = st.TicketsWithErrors.Tickets.size();
+
+        for (const auto& pair : cache->TicketsById) {
+            st.TicketsWithErrors.Tickets.insert(pair);
+        }
+        for (const auto& pair : cache->ErrorsById) {
+            st.TicketsWithErrors.Errors.insert(pair);
+        }
+        for (const auto& pair : st.TicketsWithErrors.Tickets) {
+            st.TicketsWithErrors.Errors.erase(pair.first);
+        }
+
+        TServiceTicketsPtr c = UpdateServiceTicketsCachePartly(
+            std::move(st.TicketsWithErrors),
+            gotTickets);
+        if (!c) {
+            LogWarning("UpdateMissingServiceTickets: new cache is NULL. BUG?");
+            c = cache;
+        }
+
+        if (!ServiceTicketsFilepath_) {
+            return c;
+        }
+
+        DiskCacheServiceTickets_ = AppendToJsonArray(DiskCacheServiceTickets_, st.Responses);
+
+        TDiskWriter w(ServiceTicketsFilepath_, Logger_.Get());
+        w.Write(PrepareTicketsForDisk(DiskCacheServiceTickets_, Settings_.GetSelfTvmId()));
+
+        return c;
+    }
+
+    void TThreadedUpdater::UpdatePublicKeys() {
+        if (!Settings_.IsServiceTicketCheckingRequired() && !Settings_.IsUserTicketCheckingRequired()) {
+            return;
+        }
+
+        TInstant pkut = GetUpdateTimeOfPublicKeys();
+        if (!IsTimeToUpdatePublicKeys(pkut)) {
+            return;
+        }
+
+        try {
+            TString publicKeys = GetPublicKeysFromHttp();
+
+            UpdatePublicKeysCache(publicKeys, TInstant::Now());
+            if (PublicKeysFilepath_) {
+                TDiskWriter w(PublicKeysFilepath_, Logger_.Get());
+                w.Write(publicKeys);
+            }
+            if (IsServiceContextOk() && IsUserContextOk()) {
+                ClearError(EScope::PublicKeys);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::PublicKeys, e.what());
+            LogWarning(TStringBuilder() << "Failed to update public keys: " << e.what());
+            if (TInstant::Now() - pkut > PublicKeysDurations_.Expiring) {
+                LogError("Public keys have not been refreshed for too long period");
+            }
+        }
+    }
+
+    void TThreadedUpdater::UpdateRoles() {
+        if (!RolesFetcher_) {
+            return;
+        }
+
+        TInstant rut = GetUpdateTimeOfRoles();
+        if (!TRolesFetcher::IsTimeToUpdate(RetrySettings_, TInstant::Now() - rut)) {
+            return;
+        }
+
+        struct TCloser {
+            TRolesFetcher* Fetcher;
+            ~TCloser() {
+                Fetcher->ResetConnection();
+            }
+        } closer{RolesFetcher_.get()};
+
+        try {
+            TServiceTicketsPtr st = GetCachedServiceTickets();
+            Y_ENSURE(st, "No one service ticket in memory: how it possible?");
+            auto it = st->TicketsById.find(Settings_.GetTiroleTvmId());
+            Y_ENSURE(it != st->TicketsById.end(),
+                     "Missing tvmid for tirole in cache: " << Settings_.GetTiroleTvmId());
+
+            RolesFetcher_->Update(
+                FetchWithRetries(
+                    [&]() { return RolesFetcher_->FetchActualRoles(it->second); },
+                    EScope::Roles));
+            SetUpdateTimeOfRoles(TInstant::Now());
+
+            if (RolesFetcher_->AreRolesOk()) {
+                ClearError(EScope::Roles);
+            }
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::Roles, e.what());
+            LogWarning(TStringBuilder() << "Failed to update roles: " << e.what());
+            if (TRolesFetcher::ShouldWarn(RetrySettings_, TInstant::Now() - rut)) {
+                LogError("Roles have not been refreshed for too long period");
+            }
+        }
+    }
+
+    TServiceTicketsPtr TThreadedUpdater::UpdateServiceTicketsCachePartly(
+        TAsyncUpdaterBase::TPairTicketsErrors&& tickets,
+        size_t got) {
+        size_t count = tickets.Tickets.size();
+        TServiceTicketsPtr c = MakeIntrusiveConst<TServiceTickets>(std::move(tickets.Tickets),
+                                                                   std::move(tickets.Errors),
+                                                                   DstAliases_);
+        SetServiceTickets(c);
+
+        LogInfo(TStringBuilder()
+                << "Cache was partly updated with " << got
+                << " service ticket(s). total: " << count);
+
+        return c;
+    }
+
+    void TThreadedUpdater::UpdateServiceTicketsCache(TPairTicketsErrors&& tickets, TInstant time) {
+        size_t count = tickets.Tickets.size();
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(std::move(tickets.Tickets),
+                                                              std::move(tickets.Errors),
+                                                              DstAliases_));
+
+        SetUpdateTimeOfServiceTickets(time);
+
+        if (count > 0) {
+            LogInfo(TStringBuilder() << "Cache was updated with " << count << " service ticket(s): " << time);
+        }
+    }
+
+    void TThreadedUpdater::UpdatePublicKeysCache(const TString& publicKeys, TInstant time) {
+        if (publicKeys.empty()) {
+            return;
+        }
+
+        if (Settings_.IsServiceTicketCheckingRequired()) {
+            SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+                TServiceContext::CheckingFactory(Settings_.GetSelfTvmId(),
+                                                 publicKeys)));
+        }
+
+        if (Settings_.IsUserTicketCheckingRequired()) {
+            SetUserContext(publicKeys);
+        }
+
+        SetUpdateTimeOfPublicKeys(time);
+
+        LogInfo(TStringBuilder() << "Cache was updated with public keys: " << time);
+    }
+
+    void TThreadedUpdater::ReadStateFromDisk() {
+        try {
+            TServiceTicketsFromDisk st = ReadServiceTicketsFromDisk();
+            UpdateServiceTicketsCache(std::move(st.TicketsWithErrors), st.BornDate);
+            DiskCacheServiceTickets_ = st.FileBody;
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read service tickets from disk: " << e.what());
+        }
+
+        try {
+            std::pair<TString, TInstant> pk = ReadPublicKeysFromDisk();
+            UpdatePublicKeysCache(pk.first, pk.second);
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read public keys from disk: " << e.what());
+        }
+
+        try {
+            TString rs = ReadRetrySettingsFromDisk();
+            UpdateRetrySettings(rs);
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read retry settings from disk: " << e.what());
+        }
+
+        try {
+            if (RolesFetcher_) {
+                SetUpdateTimeOfRoles(RolesFetcher_->ReadFromDisk());
+            }
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder() << "Failed to read roles from disk: " << e.what());
+        }
+    }
+
+    TThreadedUpdater::TServiceTicketsFromDisk TThreadedUpdater::ReadServiceTicketsFromDisk() const {
+        if (!ServiceTicketsFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(ServiceTicketsFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        std::pair<TStringBuf, TTvmId> data = ParseTicketsFromDisk(r.Data());
+        if (data.second != Settings_.GetSelfTvmId()) {
+            TStringStream s;
+            s << "Disk cache is for another tvmId (" << data.second << "). ";
+            s << "Self=" << Settings_.GetSelfTvmId();
+            LogWarning(s.Str());
+            return {};
+        }
+
+        TPairTicketsErrors res;
+        ParseTicketsFromResponse(data.first, Destinations_, res);
+        if (IsInvalid(TServiceTickets::GetInvalidationTime(res.Tickets), TInstant::Now())) {
+            LogWarning("Disk cache (service tickets) is too old");
+            return {};
+        }
+
+        LogInfo(TStringBuilder() << "Got " << res.Tickets.size() << " service ticket(s) from disk");
+        return {std::move(res), r.Time(), TString(data.first)};
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::ReadPublicKeysFromDisk() const {
+        if (!PublicKeysFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(PublicKeysFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        if (TInstant::Now() - r.Time() > PublicKeysDurations_.Invalid) {
+            LogWarning("Disk cache (public keys) is too old");
+            return {};
+        }
+
+        return {r.Data(), r.Time()};
+    }
+
+    TString TThreadedUpdater::ReadRetrySettingsFromDisk() const {
+        if (!RetrySettingsFilepath_) {
+            return {};
+        }
+
+        TDiskReader r(RetrySettingsFilepath_, Logger_.Get());
+        if (!r.Read()) {
+            return {};
+        }
+
+        return r.Data();
+    }
+
+    template <class Dsts>
+    TThreadedUpdater::THttpResult TThreadedUpdater::GetServiceTicketsFromHttp(const Dsts& dsts, const size_t dstLimit) const {
+        Y_ENSURE(SigningContext_, "Internal error");
+
+        TClientSettings::TDstVector part;
+        part.reserve(dstLimit);
+        THttpResult res;
+        res.TicketsWithErrors.Tickets.reserve(dsts.size());
+        res.Responses.reserve(dsts.size() / dstLimit + 1);
+
+        for (auto it = dsts.begin(); it != dsts.end();) {
+            part.clear();
+            for (size_t count = 0; it != dsts.end() && count < dstLimit; ++count, ++it) {
+                part.push_back(*it);
+            }
+
+            TString response =
+                FetchWithRetries(
+                    [this, &part]() {
+                        // create request here to keep 'ts' actual
+                        return FetchServiceTicketsFromHttp(PrepareRequestForServiceTickets(
+                            Settings_.GetSelfTvmId(),
+                            *SigningContext_,
+                            part,
+                            ProcInfo_));
+                    },
+                    EScope::ServiceTickets)
+                    .Response;
+            ParseTicketsFromResponse(response, part, res.TicketsWithErrors);
+            LogDebug(TStringBuilder()
+                     << "Response with service tickets for " << part.size()
+                     << " destination(s) was successfully fetched from " << TvmUrl_);
+
+            res.Responses.push_back(response);
+        }
+
+        LogDebug(TStringBuilder()
+                 << "Got responses with service tickets with " << res.Responses.size() << " pages for "
+                 << dsts.size() << " destination(s)");
+        for (const auto& p : res.TicketsWithErrors.Errors) {
+            LogError(TStringBuilder()
+                     << "Failed to get service ticket for dst=" << p.first << ": " << p.second);
+        }
+
+        return res;
+    }
+
+    TString TThreadedUpdater::GetPublicKeysFromHttp() const {
+        TString publicKeys =
+            FetchWithRetries(
+                [this]() { return FetchPublicKeysFromHttp(); },
+                EScope::PublicKeys)
+                .Response;
+
+        LogDebug("Public keys were successfully fetched from " + TvmUrl_);
+
+        return publicKeys;
+    }
+
+    NUtils::TFetchResult TThreadedUpdater::FetchServiceTicketsFromHttp(const TString& body) const {
+        TStringStream s;
+
+        THttpHeaders outHeaders;
+        TKeepAliveHttpClient::THttpCode code = GetClient().DoPost("/2/ticket", body, &s, Headers_, &outHeaders);
+
+        const THttpInputHeader* settings = outHeaders.FindHeader("X-Ya-Retry-Settings");
+
+        return {code, {}, "/2/ticket", s.Str(), settings ? settings->Value() : ""};
+    }
+
+    NUtils::TFetchResult TThreadedUpdater::FetchPublicKeysFromHttp() const {
+        TStringStream s;
+
+        THttpHeaders outHeaders;
+        TKeepAliveHttpClient::THttpCode code = GetClient().DoGet(PublicKeysUrl_, &s, {}, &outHeaders);
+
+        const THttpInputHeader* settings = outHeaders.FindHeader("X-Ya-Retry-Settings");
+
+        return {code, {}, "/2/keys", s.Str(), settings ? settings->Value() : ""};
+    }
+
+    bool TThreadedUpdater::UpdateRetrySettings(const TString& header) const {
+        if (header.empty()) {
+            // Probably it is some kind of test?
+            return false;
+        }
+
+        try {
+            TString raw = NUtils::Base64url2bin(header);
+            Y_ENSURE(raw, "Invalid base64url in settings");
+
+            retry_settings::v1::Settings proto;
+            Y_ENSURE(proto.ParseFromString(raw), "Invalid proto");
+
+            // This ugly hack helps to process these settings in any case
+            TThreadedUpdater& this_ = *const_cast<TThreadedUpdater*>(this);
+            TRetrySettings& res = this_.RetrySettings_;
+
+            TStringStream diff;
+            auto update = [&diff](auto& l, const auto& r, TStringBuf desc) {
+                if (l != r) {
+                    diff << desc << ":" << l << "->" << r << ";";
+                    l = r;
+                }
+            };
+
+            if (proto.has_exponential_backoff_min_sec()) {
+                update(res.BackoffSettings.Min,
+                       TDuration::Seconds(proto.exponential_backoff_min_sec()),
+                       "exponential_backoff_min");
+            }
+            if (proto.has_exponential_backoff_max_sec()) {
+                update(res.BackoffSettings.Max,
+                       TDuration::Seconds(proto.exponential_backoff_max_sec()),
+                       "exponential_backoff_max");
+            }
+            if (proto.has_exponential_backoff_factor()) {
+                update(res.BackoffSettings.Factor,
+                       proto.exponential_backoff_factor(),
+                       "exponential_backoff_factor");
+            }
+            if (proto.has_exponential_backoff_jitter()) {
+                update(res.BackoffSettings.Jitter,
+                       proto.exponential_backoff_jitter(),
+                       "exponential_backoff_jitter");
+            }
+            this_.ExpBackoff_.UpdateSettings(res.BackoffSettings);
+
+            if (proto.has_max_random_sleep_default()) {
+                update(res.MaxRandomSleepDefault,
+                       TDuration::MilliSeconds(proto.max_random_sleep_default()),
+                       "max_random_sleep_default");
+            }
+            if (proto.has_max_random_sleep_when_ok()) {
+                update(res.MaxRandomSleepWhenOk,
+                       TDuration::MilliSeconds(proto.max_random_sleep_when_ok()),
+                       "max_random_sleep_when_ok");
+            }
+            if (proto.has_retries_on_start()) {
+                Y_ENSURE(proto.retries_on_start(), "retries_on_start==0");
+                update(res.RetriesOnStart,
+                       proto.retries_on_start(),
+                       "retries_on_start");
+            }
+            if (proto.has_retries_in_background()) {
+                Y_ENSURE(proto.retries_in_background(), "retries_in_background==0");
+                update(res.RetriesInBackground,
+                       proto.retries_in_background(),
+                       "retries_in_background");
+            }
+            if (proto.has_worker_awaking_period_sec()) {
+                update(res.WorkerAwakingPeriod,
+                       TDuration::Seconds(proto.worker_awaking_period_sec()),
+                       "worker_awaking_period");
+                this_.WorkerAwakingPeriod_ = res.WorkerAwakingPeriod;
+            }
+            if (proto.has_dsts_limit()) {
+                Y_ENSURE(proto.dsts_limit(), "dsts_limit==0");
+                update(res.DstsLimit,
+                       proto.dsts_limit(),
+                       "dsts_limit");
+            }
+
+            if (proto.has_roles_update_period_sec()) {
+                Y_ENSURE(proto.roles_update_period_sec(), "roles_update_period==0");
+                update(res.RolesUpdatePeriod,
+                       TDuration::Seconds(proto.roles_update_period_sec()),
+                       "roles_update_period_sec");
+            }
+            if (proto.has_roles_warn_period_sec()) {
+                Y_ENSURE(proto.roles_warn_period_sec(), "roles_warn_period_sec==0");
+                update(res.RolesWarnPeriod,
+                       TDuration::Seconds(proto.roles_warn_period_sec()),
+                       "roles_warn_period_sec");
+            }
+
+            if (diff.empty()) {
+                return false;
+            }
+
+            LogDebug("Retry settings were updated: " + diff.Str());
+            return true;
+        } catch (const std::exception& e) {
+            LogWarning(TStringBuilder()
+                       << "Failed to update retry settings from server, header '"
+                       << header << "': "
+                       << e.what());
+        }
+
+        return false;
+    }
+
+    template <typename Func>
+    NUtils::TFetchResult TThreadedUpdater::FetchWithRetries(Func func, EScope scope) const {
+        const ui32 tries = Inited_ ? RetrySettings_.RetriesInBackground
+                                   : RetrySettings_.RetriesOnStart;
+
+        for (size_t idx = 1;; ++idx) {
+            RandomSleep();
+
+            try {
+                NUtils::TFetchResult result = func();
+
+                if (UpdateRetrySettings(result.RetrySettings) && RetrySettingsFilepath_) {
+                    TDiskWriter w(RetrySettingsFilepath_, Logger_.Get());
+                    w.Write(result.RetrySettings);
+                }
+
+                if (400 <= result.Code && result.Code <= 499) {
+                    throw TNonRetriableException() << ProcessHttpError(scope, result.Path, result.Code, result.Response);
+                }
+                if (result.Code < 200 || result.Code >= 399) {
+                    throw yexception() << ProcessHttpError(scope, result.Path, result.Code, result.Response);
+                }
+
+                ExpBackoff_.Decrease();
+                return result;
+            } catch (const TNonRetriableException& e) {
+                LogWarning(TStringBuilder() << "Failed to get " << scope << ": " << e.what());
+                ExpBackoff_.Increase();
+                throw;
+            } catch (const std::exception& e) {
+                LogWarning(TStringBuilder() << "Failed to get " << scope << ": " << e.what());
+                ExpBackoff_.Increase();
+                if (idx >= tries) {
+                    throw;
+                }
+            }
+        }
+
+        throw yexception() << "unreachable";
+    }
+
+    void TThreadedUpdater::RandomSleep() const {
+        const TDuration maxSleep = TClientStatus::ECode::Ok == GetState()
+                                       ? RetrySettings_.MaxRandomSleepWhenOk
+                                       : RetrySettings_.MaxRandomSleepDefault;
+
+        if (maxSleep) {
+            ui32 toSleep = Random_.GenRand() % maxSleep.MilliSeconds();
+            ExpBackoff_.Sleep(TDuration::MilliSeconds(toSleep));
+        }
+    }
+
+    TString TThreadedUpdater::PrepareRequestForServiceTickets(TTvmId src,
+                                                              const TServiceContext& ctx,
+                                                              const TClientSettings::TDstVector& dsts,
+                                                              const NUtils::TProcInfo& procInfo,
+                                                              time_t now) {
+        TStringStream s;
+
+        const TString ts = IntToString<10>(now);
+        TStringStream dst;
+        dst.Reserve(10 * dsts.size());
+        for (const TClientSettings::TDst& d : dsts) {
+            if (dst.Str()) {
+                dst << ',';
+            }
+            dst << d.Id;
+        }
+
+        s << "grant_type=client_credentials";
+        s << "&src=" << src;
+        s << "&dst=" << dst.Str();
+        s << "&ts=" << ts;
+        s << "&sign=" << ctx.SignCgiParamsForTvm(ts, dst.Str());
+        s << "&get_retry_settings=yes";
+
+        s << "&";
+        procInfo.AddToRequest(s);
+
+        return s.Str();
+    }
+
+    template <class Dsts>
+    void TThreadedUpdater::ParseTicketsFromResponse(TStringBuf resp,
+                                                    const Dsts& dsts,
+                                                    TPairTicketsErrors& out) const {
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(resp, &doc), "Invalid json from tvm-api: " << resp);
+
+        const NJson::TJsonValue* currentResp = doc.IsMap() ? &doc : nullptr;
+        auto find = [&currentResp, &doc](TTvmId id, NJson::TJsonValue& obj) -> bool {
+            const TString idStr = IntToString<10>(id);
+            if (currentResp && currentResp->GetValue(idStr, &obj)) {
+                return true;
+            }
+
+            for (const NJson::TJsonValue& val : doc.GetArray()) {
+                currentResp = &val;
+                if (currentResp->GetValue(idStr, &obj)) {
+                    return true;
+                }
+            }
+
+            return false;
+        };
+
+        for (const TClientSettings::TDst& d : dsts) {
+            NJson::TJsonValue obj;
+            NJson::TJsonValue val;
+
+            if (!find(d.Id, obj) || !obj.GetValue("ticket", &val)) {
+                TString err;
+                if (obj.GetValue("error", &val)) {
+                    err = val.GetString();
+                } else {
+                    err = "Missing tvm_id in response, should never happend: " + IntToString<10>(d.Id);
+                }
+
+                TStringStream s;
+                s << "Failed to get ServiceTicket for " << d.Id << ": " << err;
+                ProcessError(EType::NonRetriable, EScope::ServiceTickets, s.Str());
+
+                out.Errors.insert({d.Id, std::move(err)});
+                continue;
+            }
+
+            out.Tickets.insert({d.Id, val.GetString()});
+        }
+    }
+
+    static const char DELIMETER = '\t';
+    TString TThreadedUpdater::PrepareTicketsForDisk(TStringBuf tvmResponse, TTvmId selfId) {
+        TStringStream s;
+        s << tvmResponse << DELIMETER << selfId;
+        return s.Str();
+    }
+
+    std::pair<TStringBuf, TTvmId> TThreadedUpdater::ParseTicketsFromDisk(TStringBuf data) {
+        TStringBuf tvmId = data.RNextTok(DELIMETER);
+        return {data, IntFromString<TTvmId, 10>(tvmId)};
+    }
+
+    const TDstSet& TThreadedUpdater::GetDsts() const {
+        return Destinations_;
+    }
+
+    void TThreadedUpdater::AddDstToSettings(const TClientSettings::TDst& dst) {
+        Destinations_.insert(dst);
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdateServiceTickets(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > ServiceTicketsDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdatePublicKeys(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > PublicKeysDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::AreServicesTicketsOk() const {
+        if (!Settings_.IsServiceTicketFetchingRequired()) {
+            return true;
+        }
+        auto c = GetCachedServiceTickets();
+        return c && (!Settings_.IsIncompleteTicketsSetAnError || c->TicketsById.size() == Destinations_.size());
+    }
+
+    bool TThreadedUpdater::IsServiceContextOk() const {
+        if (!Settings_.IsServiceTicketCheckingRequired()) {
+            return true;
+        }
+
+        return bool(GetCachedServiceContext());
+    }
+
+    bool TThreadedUpdater::IsUserContextOk() const {
+        if (!Settings_.IsUserTicketCheckingRequired()) {
+            return true;
+        }
+        return bool(GetCachedUserContext());
+    }
+
+    void TThreadedUpdater::Worker() {
+        UpdateServiceTickets();
+        UpdatePublicKeys();
+        UpdateRoles();
+    }
+
+    TServiceTickets::TMapAliasId TThreadedUpdater::MakeAliasMap(const TClientSettings& settings) {
+        TServiceTickets::TMapAliasId res;
+
+        if (settings.HasDstAliases()) {
+            for (const auto& pair : settings.GetDstAliases()) {
+                res.insert({pair.first, pair.second.Id});
+            }
+        }
+
+        return res;
+    }
+
+    TClientSettings::TDstVector TThreadedUpdater::FindMissingDsts(TServiceTicketsPtr available, const TDstSet& required) {
+        Y_ENSURE(available);
+        TDstSet set;
+        // available->TicketsById is not sorted
+        for (const auto& pair : available->TicketsById) {
+            set.insert(pair.first);
+        }
+        return FindMissingDsts(set, required);
+    }
+
+    TClientSettings::TDstVector TThreadedUpdater::FindMissingDsts(const TDstSet& available, const TDstSet& required) {
+        TClientSettings::TDstVector res;
+        std::set_difference(required.begin(), required.end(),
+                            available.begin(), available.end(),
+                            std::inserter(res, res.begin()));
+        return res;
+    }
+
+    TString TThreadedUpdater::CreateJsonArray(const TSmallVec<TString>& responses) {
+        if (responses.empty()) {
+            return "[]";
+        }
+
+        size_t size = 0;
+        for (const TString& r : responses) {
+            size += r.size() + 1;
+        }
+
+        TString res;
+        res.reserve(size + 2);
+
+        res.push_back('[');
+        for (const TString& r : responses) {
+            res.append(r).push_back(',');
+        }
+        res.back() = ']';
+
+        return res;
+    }
+
+    TString TThreadedUpdater::AppendToJsonArray(const TString& json, const TSmallVec<TString>& responses) {
+        Y_ENSURE(json, "previous body required");
+
+        size_t size = 0;
+        for (const TString& r : responses) {
+            size += r.size() + 1;
+        }
+
+        TString res;
+        res.reserve(size + 2 + json.size());
+
+        res.push_back('[');
+        if (json.StartsWith('[')) {
+            Y_ENSURE(json.EndsWith(']'), "array is broken:" << json);
+            res.append(TStringBuf(json).Chop(1).Skip(1));
+        } else {
+            res.append(json);
+        }
+
+        res.push_back(',');
+        for (const TString& r : responses) {
+            res.append(r).push_back(',');
+        }
+        res.back() = ']';
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/api/threaded_updater.h b/library/cpp/tvmauth/client/misc/api/threaded_updater.h
new file mode 100644
index 00000000000..e546bbe030e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/api/threaded_updater.h
@@ -0,0 +1,140 @@
+#pragma once
+
+#include "retry_settings.h"
+#include "roles_fetcher.h"
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+#include <library/cpp/tvmauth/client/misc/threaded_updater.h>
+
+#include <util/generic/set.h>
+#include <util/random/fast.h>
+
+namespace NTvmAuth::NTvmApi {
+    using TDstSet = TSet<TClientSettings::TDst>;
+
+    class TThreadedUpdater: public TThreadedUpdaterBase {
+    public:
+        /*!
+         * Starts thread for updating of in-memory cache in background
+         * Reads cache from disk if specified
+         * @param settings
+         * @param logger is usefull for monitoring and debuging
+         */
+        static TAsyncUpdaterPtr Create(const TClientSettings& settings, TLoggerPtr logger);
+        ~TThreadedUpdater();
+
+        TClientStatus GetStatus() const override;
+        NRoles::TRolesPtr GetRoles() const override;
+
+    protected: // for tests
+        TClientStatus::ECode GetState() const;
+
+        TThreadedUpdater(const TClientSettings& settings, TLoggerPtr logger);
+        void Init();
+
+        void UpdateServiceTickets();
+        void UpdateAllServiceTickets();
+        TServiceTicketsPtr UpdateMissingServiceTickets(const TDstSet& required);
+        void UpdatePublicKeys();
+        void UpdateRoles();
+
+        TServiceTicketsPtr UpdateServiceTicketsCachePartly(TPairTicketsErrors&& tickets, size_t got);
+        void UpdateServiceTicketsCache(TPairTicketsErrors&& tickets, TInstant time);
+        void UpdatePublicKeysCache(const TString& publicKeys, TInstant time);
+
+        void ReadStateFromDisk();
+
+        struct TServiceTicketsFromDisk {
+            TPairTicketsErrors TicketsWithErrors;
+            TInstant BornDate;
+            TString FileBody;
+        };
+
+        TServiceTicketsFromDisk ReadServiceTicketsFromDisk() const;
+        std::pair<TString, TInstant> ReadPublicKeysFromDisk() const;
+        TString ReadRetrySettingsFromDisk() const;
+
+        struct THttpResult {
+            TPairTicketsErrors TicketsWithErrors;
+            TSmallVec<TString> Responses;
+        };
+
+        template <class Dsts>
+        THttpResult GetServiceTicketsFromHttp(const Dsts& dsts, const size_t dstLimit) const;
+        TString GetPublicKeysFromHttp() const;
+
+        virtual NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString& body) const;
+        virtual NUtils::TFetchResult FetchPublicKeysFromHttp() const;
+
+        bool UpdateRetrySettings(const TString& header) const;
+
+        template <typename Func>
+        NUtils::TFetchResult FetchWithRetries(Func func, EScope scope) const;
+        void RandomSleep() const;
+
+        static TString PrepareRequestForServiceTickets(TTvmId src,
+                                                       const TServiceContext& ctx,
+                                                       const TClientSettings::TDstVector& dsts,
+                                                       const NUtils::TProcInfo& procInfo,
+                                                       time_t now = time(nullptr));
+        template <class Dsts>
+        void ParseTicketsFromResponse(TStringBuf resp,
+                                      const Dsts& dsts,
+                                      TPairTicketsErrors& out) const;
+
+        static TString PrepareTicketsForDisk(TStringBuf tvmResponse, TTvmId selfId);
+        static std::pair<TStringBuf, TTvmId> ParseTicketsFromDisk(TStringBuf data);
+
+        const TDstSet& GetDsts() const;
+        void AddDstToSettings(const TClientSettings::TDst& dst);
+
+        bool IsTimeToUpdateServiceTickets(TInstant lastUpdate) const;
+        bool IsTimeToUpdatePublicKeys(TInstant lastUpdate) const;
+
+        bool AreServicesTicketsOk() const;
+        bool IsServiceContextOk() const;
+        bool IsUserContextOk() const;
+
+        void Worker() override;
+
+        static TServiceTickets::TMapAliasId MakeAliasMap(const TClientSettings& settings);
+        static TClientSettings::TDstVector FindMissingDsts(TServiceTicketsPtr available, const TDstSet& required);
+        static TClientSettings::TDstVector FindMissingDsts(const TDstSet& available, const TDstSet& required);
+
+        static TString CreateJsonArray(const TSmallVec<TString>& responses);
+        static TString AppendToJsonArray(const TString& json, const TSmallVec<TString>& responses);
+
+    private:
+        TRetrySettings RetrySettings_;
+
+    protected:
+        mutable TExponentialBackoff ExpBackoff_;
+
+    private:
+        const TClientSettings Settings_;
+
+        const NUtils::TProcInfo ProcInfo_;
+
+        const TString PublicKeysUrl_;
+
+        const TServiceTickets::TMapAliasId DstAliases_;
+
+        const TKeepAliveHttpClient::THeaders Headers_;
+        TMaybe<TServiceContext> SigningContext_;
+
+        TDstSet Destinations_;
+        TString DiskCacheServiceTickets_;
+        bool NeedFetchMissingServiceTickets_ = true;
+
+        TString PublicKeysFilepath_;
+        TString ServiceTicketsFilepath_;
+        TString RetrySettingsFilepath_;
+
+        std::unique_ptr<TRolesFetcher> RolesFetcher_;
+
+        mutable TReallyFastRng32 Random_;
+
+        bool Inited_ = false;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/async_updater.cpp b/library/cpp/tvmauth/client/misc/async_updater.cpp
new file mode 100644
index 00000000000..9cb0332ed40
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/async_updater.cpp
@@ -0,0 +1,152 @@
+#include "async_updater.h"
+
+#include "utils.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <util/string/builder.h>
+#include <util/system/spin_wait.h>
+
+namespace NTvmAuth {
+    TAsyncUpdaterBase::TAsyncUpdaterBase() {
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+        ServiceTicketsDurations_.Expiring = TDuration::Hours(2);
+        ServiceTicketsDurations_.Invalid = TDuration::Hours(11);
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        PublicKeysDurations_.Expiring = TDuration::Days(2);
+        PublicKeysDurations_.Invalid = TDuration::Days(6);
+    }
+
+    NRoles::TRolesPtr TAsyncUpdaterBase::GetRoles() const {
+        ythrow TIllegalUsage() << "not implemented";
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfPublicKeys() const {
+        return PublicKeysTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfServiceTickets() const {
+        return ServiceTicketsTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetUpdateTimeOfRoles() const {
+        return RolesTime_.Get();
+    }
+
+    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfPublicKeys() const {
+        TInstant ins = GetUpdateTimeOfPublicKeys();
+        return ins == TInstant() ? TInstant() : ins + PublicKeysDurations_.Invalid;
+    }
+
+    TInstant TAsyncUpdaterBase::GetInvalidationTimeOfServiceTickets() const {
+        TServiceTicketsPtr c = GetCachedServiceTickets();
+        return c ? c->InvalidationTime : TInstant();
+    }
+
+    bool TAsyncUpdaterBase::ArePublicKeysInvalid(TInstant now) const {
+        return IsInvalid(GetInvalidationTimeOfPublicKeys(), now);
+    }
+
+    bool TAsyncUpdaterBase::AreServiceTicketsInvalid(TInstant now) const {
+        TServiceTicketsPtr c = GetCachedServiceTickets();
+        // Empty set of tickets is allways valid.
+        return c && !c->TicketsById.empty() && IsInvalid(GetInvalidationTimeOfServiceTickets(), now);
+    }
+
+    bool TAsyncUpdaterBase::IsInvalid(TInstant invTime, TInstant now) {
+        return invTime -
+                   TDuration::Minutes(1) // lag for closing from balancer
+               < now;
+    }
+
+    void TAsyncUpdaterBase::SetBbEnv(EBlackboxEnv original, TMaybe<EBlackboxEnv> overrided) {
+        if (overrided) {
+            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(original, *overrided),
+                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
+                                                   << original << " -> " << *overrided);
+        }
+
+        Envs_.store({original, overrided}, std::memory_order_relaxed);
+    }
+
+    TServiceTicketsPtr TAsyncUpdaterBase::GetCachedServiceTickets() const {
+        return ServiceTickets_.Get();
+    }
+
+    TServiceContextPtr TAsyncUpdaterBase::GetCachedServiceContext() const {
+        return ServiceContext_.Get();
+    }
+
+    TUserContextPtr TAsyncUpdaterBase::GetCachedUserContext(TMaybe<EBlackboxEnv> overridenEnv) const {
+        TAllUserContextsPtr ctx = AllUserContexts_.Get();
+        if (!ctx) {
+            return nullptr;
+        }
+
+        const TEnvs envs = Envs_.load(std::memory_order_relaxed);
+        if (!envs.Original) {
+            return nullptr;
+        }
+
+        EBlackboxEnv env = *envs.Original;
+
+        if (overridenEnv) {
+            Y_ENSURE_EX(NUtils::CheckBbEnvOverriding(*envs.Original, *overridenEnv),
+                        TBrokenTvmClientSettings() << "Overriding of BlackboxEnv is illegal: "
+                                                   << *envs.Original << " -> " << *overridenEnv);
+            env = *overridenEnv;
+        } else if (envs.Overrided) {
+            env = *envs.Overrided;
+        }
+
+        return ctx->Get(env);
+    }
+
+    void TAsyncUpdaterBase::SetServiceTickets(TServiceTicketsPtr c) {
+        ServiceTickets_.Set(std::move(c));
+    }
+
+    void TAsyncUpdaterBase::SetServiceContext(TServiceContextPtr c) {
+        ServiceContext_.Set(std::move(c));
+    }
+
+    void TAsyncUpdaterBase::SetUserContext(TStringBuf publicKeys) {
+        AllUserContexts_.Set(MakeIntrusiveConst<TAllUserContexts>(publicKeys));
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfPublicKeys(TInstant ins) {
+        PublicKeysTime_.Set(ins);
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfServiceTickets(TInstant ins) {
+        ServiceTicketsTime_.Set(ins);
+    }
+
+    void TAsyncUpdaterBase::SetUpdateTimeOfRoles(TInstant ins) {
+        RolesTime_.Set(ins);
+    }
+
+    bool TAsyncUpdaterBase::IsServiceTicketMapOk(TServiceTicketsPtr c, size_t expectedTicketCount, bool strict) {
+        return c &&
+               (strict
+                    ? c->TicketsById.size() == expectedTicketCount
+                    : !c->TicketsById.empty());
+    }
+
+    TAllUserContexts::TAllUserContexts(TStringBuf publicKeys) {
+        auto add = [&, this](EBlackboxEnv env) {
+            Ctx_[(size_t)env] = MakeIntrusiveConst<TUserContext>(env, publicKeys);
+        };
+
+        add(EBlackboxEnv::Prod);
+        add(EBlackboxEnv::Test);
+        add(EBlackboxEnv::ProdYateam);
+        add(EBlackboxEnv::TestYateam);
+        add(EBlackboxEnv::Stress);
+    }
+
+    TUserContextPtr TAllUserContexts::Get(EBlackboxEnv env) const {
+        return Ctx_[(size_t)env];
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/async_updater.h b/library/cpp/tvmauth/client/misc/async_updater.h
new file mode 100644
index 00000000000..7b556d7a387
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/async_updater.h
@@ -0,0 +1,183 @@
+#pragma once
+
+#include "last_error.h"
+#include "settings.h"
+#include "roles/roles.h"
+
+#include <library/cpp/tvmauth/client/client_status.h>
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/tvmauth/deprecated/service_context.h>
+#include <library/cpp/tvmauth/deprecated/user_context.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/hash.h>
+#include <util/generic/maybe.h>
+#include <util/generic/noncopyable.h>
+#include <util/generic/ptr.h>
+
+#include <array>
+#include <atomic>
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+
+namespace NTvmAuth {
+    class TServiceTickets: public TAtomicRefCount<TServiceTickets> {
+    public:
+        using TMapAliasStr = THashMap<TClientSettings::TAlias, TString>;
+        using TMapIdStr = THashMap<TTvmId, TString>;
+        using TIdSet = THashSet<TTvmId>;
+        using TAliasSet = THashSet<TClientSettings::TAlias>;
+        using TMapAliasId = THashMap<TClientSettings::TAlias, TTvmId>;
+
+        TServiceTickets(TMapIdStr&& tickets, TMapIdStr&& errors, const TMapAliasId& dstMap)
+            : TicketsById(std::move(tickets))
+            , ErrorsById(std::move(errors))
+        {
+            InitAliasesAndUnfetchedIds(dstMap);
+            InitInvalidationTime();
+        }
+
+        static TInstant GetInvalidationTime(const TMapIdStr& ticketsById) {
+            TInstant res;
+
+            for (const auto& pair : ticketsById) {
+                TMaybe<TInstant> t = NTvmAuth::NInternal::TCanningKnife::GetExpirationTime(pair.second);
+                if (!t) {
+                    continue;
+                }
+
+                res = res == TInstant() ? *t : std::min(res, *t);
+            }
+
+            return res;
+        }
+
+    public:
+        TMapIdStr TicketsById;
+        TMapIdStr ErrorsById;
+        TMapAliasStr TicketsByAlias;
+        TMapAliasStr ErrorsByAlias;
+        TInstant InvalidationTime;
+        TIdSet UnfetchedIds;
+        TAliasSet UnfetchedAliases;
+
+    private:
+        void InitAliasesAndUnfetchedIds(const TMapAliasId& dstMap) {
+            for (const auto& pair : dstMap) {
+                auto it = TicketsById.find(pair.second);
+                auto errIt = ErrorsById.find(pair.second);
+
+                if (it == TicketsById.end()) {
+                    if (errIt != ErrorsById.end()) {
+                        Y_ENSURE(ErrorsByAlias.insert({pair.first, errIt->second}).second,
+                                 "failed to add: " << pair.first);
+                    } else {
+                        UnfetchedAliases.insert(pair.first);
+                        UnfetchedIds.insert(pair.second);
+                    }
+                } else {
+                    Y_ENSURE(TicketsByAlias.insert({pair.first, it->second}).second,
+                             "failed to add: " << pair.first);
+                }
+            }
+        }
+
+        void InitInvalidationTime() {
+            InvalidationTime = GetInvalidationTime(TicketsById);
+        }
+    };
+    using TServiceTicketsPtr = TIntrusiveConstPtr<TServiceTickets>;
+
+    class TAllUserContexts: public TAtomicRefCount<TAllUserContexts> {
+    public:
+        TAllUserContexts(TStringBuf publicKeys);
+
+        TUserContextPtr Get(EBlackboxEnv env) const;
+
+    private:
+        std::array<TUserContextPtr, 5> Ctx_;
+    };
+    using TAllUserContextsPtr = TIntrusiveConstPtr<TAllUserContexts>;
+
+    class TAsyncUpdaterBase: public TAtomicRefCount<TAsyncUpdaterBase>, protected TLastError, TNonCopyable {
+    public:
+        TAsyncUpdaterBase();
+        virtual ~TAsyncUpdaterBase() = default;
+
+        virtual TClientStatus GetStatus() const = 0;
+        virtual NRoles::TRolesPtr GetRoles() const;
+
+        TServiceTicketsPtr GetCachedServiceTickets() const;
+        TServiceContextPtr GetCachedServiceContext() const;
+        TUserContextPtr GetCachedUserContext(TMaybe<EBlackboxEnv> overridenEnv = {}) const;
+
+        TInstant GetUpdateTimeOfPublicKeys() const;
+        TInstant GetUpdateTimeOfServiceTickets() const;
+        TInstant GetUpdateTimeOfRoles() const;
+        TInstant GetInvalidationTimeOfPublicKeys() const;
+        TInstant GetInvalidationTimeOfServiceTickets() const;
+
+        bool ArePublicKeysInvalid(TInstant now) const;
+        bool AreServiceTicketsInvalid(TInstant now) const;
+        static bool IsInvalid(TInstant invTime, TInstant now);
+
+    protected:
+        void SetBbEnv(EBlackboxEnv original, TMaybe<EBlackboxEnv> overrided = {});
+
+        void SetServiceTickets(TServiceTicketsPtr c);
+        void SetServiceContext(TServiceContextPtr c);
+        void SetUserContext(TStringBuf publicKeys);
+        void SetUpdateTimeOfPublicKeys(TInstant ins);
+        void SetUpdateTimeOfServiceTickets(TInstant ins);
+        void SetUpdateTimeOfRoles(TInstant ins);
+
+        static bool IsServiceTicketMapOk(TServiceTicketsPtr c, size_t expectedTicketCount, bool strict);
+
+    protected:
+        struct TPairTicketsErrors {
+            TServiceTickets::TMapIdStr Tickets;
+            TServiceTickets::TMapIdStr Errors;
+
+            bool operator==(const TPairTicketsErrors& o) const {
+                return Tickets == o.Tickets && Errors == o.Errors;
+            }
+        };
+
+        struct TStateDurations {
+            TDuration RefreshPeriod;
+            TDuration Expiring;
+            TDuration Invalid;
+        };
+
+        TStateDurations ServiceTicketsDurations_;
+        TStateDurations PublicKeysDurations_;
+
+    protected:
+        virtual void StartTvmClientStopping() const {
+        }
+        virtual bool IsTvmClientStopped() const {
+            return true;
+        }
+        friend class NTvmAuth::NInternal::TClientCaningKnife;
+
+    private:
+        struct TEnvs {
+            TMaybe<EBlackboxEnv> Original;
+            TMaybe<EBlackboxEnv> Overrided;
+        };
+        static_assert(sizeof(TEnvs) <= 8, "Small struct is easy to store as atomic");
+        std::atomic<TEnvs> Envs_ = {{}};
+
+        NUtils::TProtectedValue<TServiceTicketsPtr> ServiceTickets_;
+        NUtils::TProtectedValue<TServiceContextPtr> ServiceContext_;
+        NUtils::TProtectedValue<TAllUserContextsPtr> AllUserContexts_;
+        NUtils::TProtectedValue<TInstant> PublicKeysTime_;
+        NUtils::TProtectedValue<TInstant> ServiceTicketsTime_;
+        NUtils::TProtectedValue<TInstant> RolesTime_;
+    };
+    using TAsyncUpdaterPtr = TIntrusiveConstPtr<TAsyncUpdaterBase>;
+}
diff --git a/library/cpp/tvmauth/client/misc/checker.h b/library/cpp/tvmauth/client/misc/checker.h
new file mode 100644
index 00000000000..e8ed2f55036
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/checker.h
@@ -0,0 +1,67 @@
+#pragma once
+
+#include "async_updater.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth {
+    class TServiceTicketChecker {
+    public:
+        TServiceTicketChecker(TAsyncUpdaterPtr updater)
+            : Updater_(std::move(updater))
+        {
+            Y_ENSURE(Updater_);
+            GetCache();
+        }
+
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        TCheckedServiceTicket Check(TStringBuf ticket) const {
+            return GetCache()->Check(ticket);
+        }
+
+    private:
+        TServiceContextPtr GetCache() const {
+            TServiceContextPtr c = Updater_->GetCachedServiceContext();
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableServiceTicketChecking()");
+            return c;
+        }
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+    };
+
+    class TUserTicketChecker {
+    public:
+        TUserTicketChecker(TAsyncUpdaterPtr updater)
+            : Updater_(std::move(updater))
+        {
+            Y_ENSURE(Updater_);
+            GetCache({});
+        }
+
+        /*!
+         * Blackbox enviroment must be cofingured in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         */
+        TCheckedUserTicket Check(TStringBuf ticket, TMaybe<EBlackboxEnv> overridenEnv) const {
+            return GetCache(overridenEnv)->Check(ticket);
+        }
+
+    private:
+        TUserContextPtr GetCache(TMaybe<EBlackboxEnv> overridenEnv) const {
+            TUserContextPtr c = Updater_->GetCachedUserContext(overridenEnv);
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableUserTicketChecking()");
+            return c;
+        }
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/default_uid_checker.h b/library/cpp/tvmauth/client/misc/default_uid_checker.h
new file mode 100644
index 00000000000..1594f826bdc
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/default_uid_checker.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "async_updater.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+#include <library/cpp/tvmauth/src/user_impl.h>
+
+namespace NTvmAuth {
+    class TDefaultUidChecker {
+    public:
+        TDefaultUidChecker(TAsyncUpdaterPtr updater)
+            : Updater_(std::move(updater))
+        {
+            Y_ENSURE(Updater_);
+            GetCache();
+        }
+
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        TCheckedUserTicket Check(TCheckedUserTicket ticket) const {
+            NRoles::TConsumerRolesPtr roles = GetCache()->GetRolesForUser(ticket);
+            if (roles) {
+                return ticket;
+            }
+
+            TUserTicketImplPtr impl = THolder(NInternal::TCanningKnife::GetU(ticket));
+            impl->SetStatus(ETicketStatus::NoRoles);
+            return TCheckedUserTicket(std::move(impl));
+        }
+
+    private:
+        NRoles::TRolesPtr GetCache() const {
+            NRoles::TRolesPtr c = Updater_->GetRoles();
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableRolesFetching()");
+            return c;
+        }
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/disk_cache.cpp b/library/cpp/tvmauth/client/misc/disk_cache.cpp
new file mode 100644
index 00000000000..3c01be4a837
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/disk_cache.cpp
@@ -0,0 +1,165 @@
+#include "disk_cache.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <contrib/libs/openssl/include/openssl/evp.h>
+#include <contrib/libs/openssl/include/openssl/hmac.h>
+#include <contrib/libs/openssl/include/openssl/sha.h>
+
+#include <util/folder/path.h>
+#include <util/stream/file.h>
+#include <util/stream/str.h>
+#include <util/system/fs.h>
+#include <util/system/sysstat.h>
+#include <util/system/tempfile.h>
+
+#include <exception>
+
+namespace NTvmAuth {
+    static const size_t HASH_SIZE = 32;
+    static const size_t TIMESTAMP_SIZE = sizeof(time_t);
+
+    TDiskReader::TDiskReader(const TString& filename, ILogger* logger)
+        : Filename_(filename)
+        , Logger_(logger)
+    {
+    }
+
+    bool TDiskReader::Read() {
+        TStringStream s;
+
+        try {
+            if (!NFs::Exists(Filename_)) {
+                if (Logger_) {
+                    s << "File '" << Filename_ << "' does not exist";
+                    Logger_->Debug(s.Str());
+                }
+                return false;
+            }
+
+            TFile file(Filename_, OpenExisting | RdOnly | Seq);
+            file.Flock(LOCK_SH | LOCK_NB);
+
+            TFileInput input(file);
+            return ParseData(input.ReadAll());
+        } catch (const std::exception& e) {
+            if (Logger_) {
+                s << "Failed to read '" << Filename_ << "': " << e.what();
+                Logger_->Error(s.Str());
+            }
+        }
+
+        return false;
+    }
+
+    bool TDiskReader::ParseData(TStringBuf buf) {
+        TStringStream s;
+
+        if (buf.size() <= HASH_SIZE + TIMESTAMP_SIZE) {
+            if (Logger_) {
+                s << "File '" << Filename_ << "' is too small";
+                Logger_->Warning(s.Str());
+            }
+            return false;
+        }
+
+        TStringBuf hash = buf.SubStr(0, HASH_SIZE);
+        if (hash != GetHash(buf.Skip(HASH_SIZE))) {
+            if (Logger_) {
+                s << "Content of '" << Filename_ << "' was incorrectly changed";
+                Logger_->Warning(s.Str());
+            }
+            return false;
+        }
+
+        Time_ = TInstant::Seconds(GetTimestamp(buf.substr(0, TIMESTAMP_SIZE)));
+        Data_ = buf.Skip(TIMESTAMP_SIZE);
+
+        if (Logger_) {
+            s << "File '" << Filename_ << "' was successfully read";
+            Logger_->Info(s.Str());
+        }
+        return true;
+    }
+
+    TString TDiskReader::GetHash(TStringBuf data) {
+        TString value(EVP_MAX_MD_SIZE, 0);
+        unsigned macLen = 0;
+        if (!::HMAC(EVP_sha256(),
+                    "",
+                    0,
+                    (unsigned char*)data.data(),
+                    data.size(),
+                    (unsigned char*)value.data(),
+                    &macLen)) {
+            return {};
+        }
+
+        if (macLen != EVP_MAX_MD_SIZE) {
+            value.resize(macLen);
+        }
+
+        return value;
+    }
+
+    time_t TDiskReader::GetTimestamp(TStringBuf data) {
+        time_t time = 0;
+        for (int idx = TIMESTAMP_SIZE - 1; idx >= 0; --idx) {
+            time <<= 8;
+            time |= static_cast<unsigned char>(data.at(idx));
+        }
+        return time;
+    }
+
+    TDiskWriter::TDiskWriter(const TString& filename, ILogger* logger)
+        : Filename_(filename)
+        , Logger_(logger)
+    {
+    }
+
+    bool TDiskWriter::Write(TStringBuf data, TInstant now) {
+        TStringStream s;
+
+        try {
+            {
+                if (NFs::Exists(Filename_)) {
+                    Chmod(Filename_.c_str(),
+                          S_IRUSR | S_IWUSR); // 600
+                }
+
+                TFile file(Filename_, CreateAlways | WrOnly | Seq | AWUser | ARUser);
+                file.Flock(LOCK_EX | LOCK_NB);
+
+                TFileOutput output(file);
+                output << PrepareData(now, data);
+            }
+
+            if (Logger_) {
+                s << "File '" << Filename_ << "' was successfully written";
+                Logger_->Info(s.Str());
+            }
+            return true;
+        } catch (const std::exception& e) {
+            if (Logger_) {
+                s << "Failed to write '" << Filename_ << "': " << e.what();
+                Logger_->Error(s.Str());
+            }
+        }
+
+        return false;
+    }
+
+    TString TDiskWriter::PrepareData(TInstant time, TStringBuf data) {
+        TString toHash = WriteTimestamp(time.TimeT()) + data;
+        return TDiskReader::GetHash(toHash) + toHash;
+    }
+
+    TString TDiskWriter::WriteTimestamp(time_t time) {
+        TString res(TIMESTAMP_SIZE, 0);
+        for (size_t idx = 0; idx < TIMESTAMP_SIZE; ++idx) {
+            res[idx] = time & 0xFF;
+            time >>= 8;
+        }
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/disk_cache.h b/library/cpp/tvmauth/client/misc/disk_cache.h
new file mode 100644
index 00000000000..9e77556f86e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/disk_cache.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <util/datetime/base.h>
+#include <util/generic/string.h>
+
+namespace NTvmAuth {
+    class ILogger;
+
+    class TDiskReader {
+    public:
+        TDiskReader(const TString& filename, ILogger* logger = nullptr);
+
+        bool Read();
+
+        const TString& Data() const {
+            return Data_;
+        }
+
+        TInstant Time() const {
+            return Time_;
+        }
+
+    public: // for tests
+        bool ParseData(TStringBuf buf);
+
+        static TString GetHash(TStringBuf data);
+        static time_t GetTimestamp(TStringBuf data);
+
+    private:
+        TString Filename_;
+        ILogger* Logger_;
+        TInstant Time_;
+        TString Data_;
+    };
+
+    class TDiskWriter {
+    public:
+        TDiskWriter(const TString& filename, ILogger* logger = nullptr);
+
+        bool Write(TStringBuf data, TInstant now = TInstant::Now());
+
+    public: // for tests
+        static TString PrepareData(TInstant time, TStringBuf data);
+        static TString WriteTimestamp(time_t time);
+
+    private:
+        TString Filename_;
+        ILogger* Logger_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/exponential_backoff.h b/library/cpp/tvmauth/client/misc/exponential_backoff.h
new file mode 100644
index 00000000000..89a7a3c8ad6
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/exponential_backoff.h
@@ -0,0 +1,94 @@
+#pragma once
+
+#include <util/datetime/base.h>
+#include <util/random/normal.h>
+#include <util/system/event.h>
+
+#include <atomic>
+
+namespace NTvmAuth {
+    // https://habr.com/ru/post/227225/
+    class TExponentialBackoff {
+    public:
+        struct TSettings {
+            TDuration Min;
+            TDuration Max;
+            double Factor = 1.001;
+            double Jitter = 0;
+
+            bool operator==(const TSettings& o) const {
+                return Min == o.Min &&
+                       Max == o.Max &&
+                       Factor == o.Factor &&
+                       Jitter == o.Jitter;
+            }
+        };
+
+        TExponentialBackoff(const TSettings& settings, bool isEnabled = true)
+            : CurrentValue_(settings.Min)
+            , IsEnabled_(isEnabled)
+        {
+            UpdateSettings(settings);
+        }
+
+        void UpdateSettings(const TSettings& settings) {
+            Y_ENSURE(settings.Factor > 1, "factor=" << settings.Factor << ". Should be > 1");
+            Y_ENSURE(settings.Jitter >= 0 && settings.Jitter < 1, "jitter should be in range [0, 1)");
+
+            Min_ = settings.Min;
+            Max_ = settings.Max;
+            Factor_ = settings.Factor;
+            Jitter_ = settings.Jitter;
+        }
+
+        TDuration Increase() {
+            CurrentValue_ = std::min(CurrentValue_ * Factor_, Max_);
+
+            double rnd = StdNormalRandom<double>();
+            const bool isNegative = rnd < 0;
+            rnd = std::abs(rnd);
+
+            const TDuration diff = rnd * Jitter_ * CurrentValue_;
+            if (isNegative) {
+                CurrentValue_ -= diff;
+            } else {
+                CurrentValue_ += diff;
+            }
+
+            return CurrentValue_;
+        }
+
+        TDuration Decrease() {
+            CurrentValue_ = std::max(CurrentValue_ / Factor_, Min_);
+            return CurrentValue_;
+        }
+
+        void Sleep(TDuration add = TDuration()) {
+            if (IsEnabled_.load(std::memory_order_relaxed)) {
+                Ev_.WaitT(CurrentValue_ + add);
+            }
+        }
+
+        void Interrupt() {
+            Ev_.Signal();
+        }
+
+        TDuration GetCurrentValue() const {
+            return CurrentValue_;
+        }
+
+        void SetEnabled(bool val) {
+            IsEnabled_.store(val);
+        }
+
+    private:
+        TDuration Min_;
+        TDuration Max_;
+        double Factor_;
+        double Jitter_;
+        TDuration CurrentValue_;
+        std::atomic_bool IsEnabled_;
+
+        TAutoEvent Ev_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/fetch_result.h b/library/cpp/tvmauth/client/misc/fetch_result.h
new file mode 100644
index 00000000000..4b0774e92f5
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/fetch_result.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NUtils {
+    struct TFetchResult {
+        TKeepAliveHttpClient::THttpCode Code;
+        THttpHeaders Headers;
+        TStringBuf Path;
+        TString Response;
+        TString RetrySettings;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/getter.h b/library/cpp/tvmauth/client/misc/getter.h
new file mode 100644
index 00000000000..b0327d69e99
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/getter.h
@@ -0,0 +1,66 @@
+#pragma once
+
+#include "checker.h"
+
+namespace NTvmAuth {
+    class TServiceTicketGetter {
+    public:
+        TServiceTicketGetter(TAsyncUpdaterPtr updater)
+            : Updater_(std::move(updater))
+        {
+            Y_ENSURE(Updater_);
+            GetCache();
+        }
+
+        /*!
+         * Fetching must enabled in TClientSettings
+         * Can throw exception if cache is invalid or wrong config
+         * @param dst
+         */
+        TString GetTicket(const TClientSettings::TAlias& dst) const {
+            TServiceTicketsPtr c = GetCache();
+            return GetTicketImpl(dst, c->TicketsByAlias, c->ErrorsByAlias, c->UnfetchedAliases);
+        }
+
+        TString GetTicket(const TTvmId dst) const {
+            TServiceTicketsPtr c = GetCache();
+            return GetTicketImpl(dst, c->TicketsById, c->ErrorsById, c->UnfetchedIds);
+        }
+
+    private:
+        template <class Key, class Cont, class UnfetchedCont>
+        TString GetTicketImpl(const Key& dst, const Cont& tickets, const Cont& errors, const UnfetchedCont& unfetched) const {
+            auto it = tickets.find(dst);
+            if (it != tickets.end()) {
+                return it->second;
+            }
+
+            it = errors.find(dst);
+            if (it != errors.end()) {
+                ythrow TMissingServiceTicket()
+                    << "Failed to get ticket for '" << dst << "': "
+                    << it->second;
+            }
+
+            if (unfetched.contains(dst)) {
+                ythrow TMissingServiceTicket()
+                    << "Failed to get ticket for '" << dst << "': this dst was not fetched yet.";
+            }
+
+            ythrow TBrokenTvmClientSettings()
+                << "Destination '" << dst << "' was not specified in settings. "
+                << "Check your settings (if you use Qloud/YP/tvmtool - check it's settings)";
+        }
+
+    private:
+        TServiceTicketsPtr GetCache() const {
+            TServiceTicketsPtr c = Updater_->GetCachedServiceTickets();
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings()
+                               << "Need to use TClientSettings::EnableServiceTicketsFetchOptions()");
+            return c;
+        }
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/last_error.cpp b/library/cpp/tvmauth/client/misc/last_error.cpp
new file mode 100644
index 00000000000..a6279bb1efe
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/last_error.cpp
@@ -0,0 +1,115 @@
+#include "last_error.h"
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth {
+    TLastError::TLastError()
+        : LastErrors_(MakeIntrusiveConst<TLastErrors>())
+    {
+    }
+
+    TString TLastError::GetLastError(bool isOk, EType* type) const {
+        if (isOk) {
+            return OK_;
+        }
+
+        const TLastErrorsPtr ptr = LastErrors_.Get();
+
+        for (const TLastErr& err : ptr->Errors) {
+            if (err && err->first == EType::NonRetriable) {
+                if (type) {
+                    *type = EType::NonRetriable;
+                }
+                return err->second;
+            }
+        }
+
+        for (const TLastErr& err : ptr->Errors) {
+            if (err) {
+                if (type) {
+                    *type = EType::Retriable;
+                }
+                return err->second;
+            }
+        }
+
+        if (type) {
+            *type = EType::NonRetriable;
+        }
+        return "Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru";
+    }
+
+    TString TLastError::ProcessHttpError(TLastError::EScope scope,
+                                         TStringBuf path,
+                                         int code,
+                                         const TString& msg) const {
+        TString err = TStringBuilder() << "Path:" << path << ".Code=" << code << ": " << msg;
+
+        ProcessError(code >= 400 && code < 500 ? EType::NonRetriable
+                                               : EType::Retriable,
+                     scope,
+                     err);
+
+        return err;
+    }
+
+    void TLastError::ProcessError(TLastError::EType type, TLastError::EScope scope, const TStringBuf msg) const {
+        Update(scope, [&](TLastErr& lastError) {
+            if (lastError && lastError->first == EType::NonRetriable && type == EType::Retriable) {
+                return false;
+            }
+
+            TString err = TStringBuilder() << scope << ": " << msg;
+            err.erase(std::remove(err.begin(), err.vend(), '\r'), err.vend());
+            std::replace(err.begin(), err.vend(), '\n', ' ');
+
+            lastError = {type, std::move(err)};
+            return true;
+        });
+    }
+
+    void TLastError::ClearError(TLastError::EScope scope) {
+        Update(scope, [&](TLastErr& lastError) {
+            if (!lastError) {
+                return false;
+            }
+
+            lastError.Clear();
+            return true;
+        });
+    }
+
+    void TLastError::ClearErrors() {
+        for (size_t idx = 0; idx < (size_t)EScope::COUNT; ++idx) {
+            ClearError((EScope)idx);
+        }
+    }
+
+    void TLastError::ThrowLastError() {
+        EType type;
+        TString err = GetLastError(false, &type);
+
+        switch (type) {
+            case EType::NonRetriable:
+                ythrow TNonRetriableException()
+                    << "Failed to start TvmClient. Do not retry: "
+                    << err;
+            case EType::Retriable:
+                ythrow TRetriableException()
+                    << "Failed to start TvmClient. You can retry: "
+                    << err;
+        }
+    }
+
+    template <typename Func>
+    void TLastError::Update(TLastError::EScope scope, Func func) const {
+        Y_VERIFY(scope != EScope::COUNT);
+
+        TLastErrors errs = *LastErrors_.Get();
+        TLastErr& lastError = errs.Errors[(size_t)scope];
+
+        if (func(lastError)) {
+            LastErrors_.Set(MakeIntrusiveConst<TLastErrors>(std::move(errs)));
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/last_error.h b/library/cpp/tvmauth/client/misc/last_error.h
new file mode 100644
index 00000000000..b0ad33611fe
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/last_error.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "utils.h"
+
+#include <array>
+
+namespace NTvmAuth {
+    class TLastError {
+    public:
+        enum class EType {
+            NonRetriable,
+            Retriable,
+        };
+
+        enum class EScope {
+            ServiceTickets,
+            PublicKeys,
+            Roles,
+            TvmtoolConfig,
+
+            COUNT,
+        };
+
+        using TLastErr = TMaybe<std::pair<EType, TString>>;
+
+        struct TLastErrors: public TAtomicRefCount<TLastErrors> {
+            std::array<TLastErr, (int)EScope::COUNT> Errors;
+        };
+        using TLastErrorsPtr = TIntrusiveConstPtr<TLastErrors>;
+
+    public:
+        TLastError();
+
+        TString GetLastError(bool isOk, EType* type = nullptr) const;
+
+        TString ProcessHttpError(EScope scope, TStringBuf path, int code, const TString& msg) const;
+        void ProcessError(EType type, EScope scope, const TStringBuf msg) const;
+        void ClearError(EScope scope);
+        void ClearErrors();
+        void ThrowLastError();
+
+    private:
+        template <typename Func>
+        void Update(EScope scope, Func func) const;
+
+    private:
+        const TString OK_ = "OK";
+
+        mutable NUtils::TProtectedValue<TLastErrorsPtr> LastErrors_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/proc_info.cpp b/library/cpp/tvmauth/client/misc/proc_info.cpp
new file mode 100644
index 00000000000..e2e5ec15b9e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/proc_info.cpp
@@ -0,0 +1,53 @@
+#include "proc_info.h"
+
+#include <library/cpp/tvmauth/version.h>
+
+#include <library/cpp/string_utils/quote/quote.h>
+
+#include <util/stream/file.h>
+#include <util/string/cast.h>
+#include <util/system/getpid.h>
+
+namespace NTvmAuth::NUtils {
+    void TProcInfo::AddToRequest(IOutputStream& out) const {
+        out << "_pid=" << Pid;
+        if (ProcessName) {
+            out << "&_procces_name=" << *ProcessName;
+        }
+        out << "&lib_version=client_" << VersionPrefix << LibVersion();
+    }
+
+    TProcInfo TProcInfo::Create(const TString& versionPrefix) {
+        TProcInfo res;
+        res.Pid = IntToString<10>(GetPID());
+        res.ProcessName = GetProcessName();
+        res.VersionPrefix = versionPrefix;
+        return res;
+    }
+
+    std::optional<TString> TProcInfo::GetProcessName() {
+        try {
+            // works only for linux
+            TFileInput proc("/proc/self/status");
+
+            TString line;
+            while (proc.ReadLine(line)) {
+                TStringBuf buf(line);
+                if (!buf.SkipPrefix("Name:")) {
+                    continue;
+                }
+
+                while (buf && isspace(buf.front())) {
+                    buf.Skip(1);
+                }
+
+                TString res(buf);
+                CGIEscape(res);
+                return res;
+            }
+        } catch (...) {
+        }
+
+        return {};
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/proc_info.h b/library/cpp/tvmauth/client/misc/proc_info.h
new file mode 100644
index 00000000000..b1526e5c470
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/proc_info.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <util/generic/string.h>
+
+#include <optional>
+
+namespace NTvmAuth::NUtils {
+    struct TProcInfo {
+        TString Pid;
+        std::optional<TString> ProcessName;
+        TString VersionPrefix;
+
+        void AddToRequest(IOutputStream& out) const;
+
+        static TProcInfo Create(const TString& versionPrefix);
+        static std::optional<TString> GetProcessName();
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto b/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto
new file mode 100644
index 00000000000..72817847a64
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/retry_settings/v1/settings.proto
@@ -0,0 +1,21 @@
+syntax = "proto2";
+
+package retry_settings.v1;
+
+option cc_enable_arenas = true;
+option go_package = "a.yandex-team.ru/library/cpp/tvmauth/client/misc/retry_settings/v1";
+
+message Settings {
+    optional uint32 exponential_backoff_min_sec = 1;
+    optional uint32 exponential_backoff_max_sec = 2;
+    optional double exponential_backoff_factor = 3;
+    optional double exponential_backoff_jitter = 4;
+    optional uint32 max_random_sleep_default = 5;
+    optional uint32 max_random_sleep_when_ok = 12;
+    optional uint32 retries_on_start = 6;
+    optional uint32 worker_awaking_period_sec = 7;
+    optional uint32 dsts_limit = 8;
+    optional uint32 retries_in_background = 9;
+    optional uint32 roles_update_period_sec = 10;
+    optional uint32 roles_warn_period_sec = 11;
+}
diff --git a/library/cpp/tvmauth/client/misc/retry_settings/v1/ya.make b/library/cpp/tvmauth/client/misc/retry_settings/v1/ya.make
new file mode 100644
index 00000000000..226bf7cea7a
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/retry_settings/v1/ya.make
@@ -0,0 +1,15 @@
+PROTO_LIBRARY()
+
+OWNER(g:passport_infra)
+
+EXCLUDE_TAGS(
+    JAVA_PROTO
+    PY_PROTO
+    PY3_PROTO
+)
+
+SRCS(
+    settings.proto
+)
+
+END()
diff --git a/library/cpp/tvmauth/client/misc/roles/decoder.cpp b/library/cpp/tvmauth/client/misc/roles/decoder.cpp
new file mode 100644
index 00000000000..6337fb91c20
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/decoder.cpp
@@ -0,0 +1,93 @@
+#include "decoder.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/openssl/crypto/sha.h>
+#include <library/cpp/streams/brotli/brotli.h>
+#include <library/cpp/streams/zstd/zstd.h>
+
+#include <util/generic/yexception.h>
+#include <util/stream/zlib.h>
+#include <util/string/ascii.h>
+
+namespace NTvmAuth::NRoles {
+    TString TDecoder::Decode(const TStringBuf codec, TString&& blob) {
+        if (codec.empty()) {
+            return std::move(blob);
+        }
+
+        const TCodecInfo info = ParseCodec(codec);
+        TString decoded = DecodeImpl(info.Type, blob);
+
+        VerifySize(decoded, info.Size);
+        VerifyChecksum(decoded, info.Sha256);
+
+        return decoded;
+    }
+
+    TDecoder::TCodecInfo TDecoder::ParseCodec(TStringBuf codec) {
+        const char delim = ':';
+
+        const TStringBuf version = codec.NextTok(delim);
+        Y_ENSURE(version == "1",
+                 "unknown codec format version; known: 1; got: " << version);
+
+        TCodecInfo res;
+        res.Type = codec.NextTok(delim);
+        Y_ENSURE(res.Type, "codec type is empty");
+
+        const TStringBuf size = codec.NextTok(delim);
+        Y_ENSURE(TryIntFromString<10>(size, res.Size),
+                 "decoded blob size is not number");
+
+        res.Sha256 = codec;
+        const size_t expectedSha256Size = 2 * NOpenSsl::NSha256::DIGEST_LENGTH;
+        Y_ENSURE(res.Sha256.size() == expectedSha256Size,
+                 "sha256 of decoded blob has invalid length: expected "
+                     << expectedSha256Size << ", got " << res.Sha256.size());
+
+        return res;
+    }
+
+    TString TDecoder::DecodeImpl(TStringBuf codec, const TString& blob) {
+        if (AsciiEqualsIgnoreCase(codec, "brotli")) {
+            return DecodeBrolti(blob);
+        } else if (AsciiEqualsIgnoreCase(codec, "gzip")) {
+            return DecodeGzip(blob);
+        } else if (AsciiEqualsIgnoreCase(codec, "zstd")) {
+            return DecodeZstd(blob);
+        }
+
+        ythrow yexception() << "unknown codec: '" << codec << "'";
+    }
+
+    TString TDecoder::DecodeBrolti(const TString& blob) {
+        TStringInput in(blob);
+        return TBrotliDecompress(&in).ReadAll();
+    }
+
+    TString TDecoder::DecodeGzip(const TString& blob) {
+        TStringInput in(blob);
+        return TZLibDecompress(&in).ReadAll();
+    }
+
+    TString TDecoder::DecodeZstd(const TString& blob) {
+        TStringInput in(blob);
+        return TZstdDecompress(&in).ReadAll();
+    }
+
+    void TDecoder::VerifySize(const TStringBuf decoded, size_t expected) {
+        Y_ENSURE(expected == decoded.size(),
+                 "Decoded blob has bad size: expected " << expected << ", actual " << decoded.size());
+    }
+
+    void TDecoder::VerifyChecksum(const TStringBuf decoded, const TStringBuf expected) {
+        using namespace NOpenSsl::NSha256;
+
+        const TDigest dig = Calc(decoded);
+        const TString actual = NUtils::ToHex(TStringBuf((char*)dig.data(), dig.size()));
+
+        Y_ENSURE(AsciiEqualsIgnoreCase(actual, expected),
+                 "Decoded blob has bad sha256: expected=" << expected << ", actual=" << actual);
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/decoder.h b/library/cpp/tvmauth/client/misc/roles/decoder.h
new file mode 100644
index 00000000000..de5cdb37e0e
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/decoder.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <util/generic/string.h>
+
+namespace NTvmAuth::NRoles {
+    class TDecoder {
+    public:
+        static TString Decode(const TStringBuf codec, TString&& blob);
+
+    public:
+        struct TCodecInfo {
+            TStringBuf Type;
+            size_t Size = 0;
+            TStringBuf Sha256;
+
+            bool operator==(const TCodecInfo& o) const {
+                return Type == o.Type &&
+                       Size == o.Size &&
+                       Sha256 == o.Sha256;
+            }
+        };
+
+        static TCodecInfo ParseCodec(TStringBuf codec);
+        static TString DecodeImpl(TStringBuf codec, const TString& blob);
+        static TString DecodeBrolti(const TString& blob);
+        static TString DecodeGzip(const TString& blob);
+        static TString DecodeZstd(const TString& blob);
+
+        static void VerifySize(const TStringBuf decoded, size_t expected);
+        static void VerifyChecksum(const TStringBuf decoded, const TStringBuf expected);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/entities_index.cpp b/library/cpp/tvmauth/client/misc/roles/entities_index.cpp
new file mode 100644
index 00000000000..c9b72c3a17f
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/entities_index.cpp
@@ -0,0 +1,114 @@
+#include "entities_index.h"
+
+#include <util/stream/str.h>
+
+#include <set>
+
+namespace NTvmAuth::NRoles {
+    TEntitiesIndex::TStage::TStage(const std::set<TString>& k)
+        : Keys_(k.begin(), k.end())
+    {
+    }
+
+    // TODO TStringBuf
+    bool TEntitiesIndex::TStage::GetNextKeySet(std::vector<TString>& out) {
+        out.clear();
+        out.reserve(Keys_.size());
+
+        ++Id_;
+        for (size_t idx = 0; idx < Keys_.size(); ++idx) {
+            bool need = (Id_ >> idx) & 0x01;
+
+            if (need) {
+                out.push_back(Keys_[idx]);
+            }
+        }
+
+        return !out.empty();
+    }
+
+    TEntitiesIndex::TEntitiesIndex(const std::vector<TEntityPtr>& entities) {
+        const std::set<TString> uniqueKeys = GetUniqueSortedKeys(entities);
+        Idx_.Entities = entities;
+        Idx_.SubTree.reserve(uniqueKeys.size() * entities.size());
+
+        TStage stage(uniqueKeys);
+        std::vector<TString> keyset;
+        while (stage.GetNextKeySet(keyset)) {
+            for (const TEntityPtr& e : entities) {
+                TSubTree* currentBranch = &Idx_;
+
+                for (const TString& key : keyset) {
+                    auto it = e->find(key);
+                    if (it == e->end()) {
+                        continue;
+                    }
+
+                    auto [i, ok] = currentBranch->SubTree.emplace(
+                        TKeyValue{it->first, it->second},
+                        TSubTree());
+
+                    currentBranch = &i->second;
+                    currentBranch->Entities.push_back(e);
+                }
+            }
+        }
+
+        MakeUnique(Idx_);
+    }
+
+    std::set<TString> TEntitiesIndex::GetUniqueSortedKeys(const std::vector<TEntityPtr>& entities) {
+        std::set<TString> res;
+
+        for (const TEntityPtr& e : entities) {
+            for (const auto& [key, value] : *e) {
+                res.insert(key);
+            }
+        }
+
+        return res;
+    }
+
+    void TEntitiesIndex::MakeUnique(TSubTree& branch) {
+        auto& vec = branch.Entities;
+        std::sort(vec.begin(), vec.end());
+        vec.erase(std::unique(vec.begin(), vec.end()), vec.end());
+
+        for (auto& [_, restPart] : branch.SubTree) {
+            MakeUnique(restPart);
+        }
+    }
+
+    static void Print(const TEntitiesIndex::TSubTree& part, IOutputStream& out, size_t offset = 0) {
+        std::vector<std::pair<TKeyValue, const TEntitiesIndex::TSubTree*>> vec;
+        vec.reserve(part.SubTree.size());
+
+        for (const auto& [key, value] : part.SubTree) {
+            vec.push_back({key, &value});
+        }
+
+        std::sort(vec.begin(), vec.end(), [](const auto& l, const auto& r) {
+            if (l.first.Key < r.first.Key) {
+                return true;
+            }
+            if (l.first.Value < r.first.Value) {
+                return true;
+            }
+            return false;
+        });
+
+        for (const auto& [key, value] : vec) {
+            out << TString(offset, ' ') << "\"" << key.Key << "/" << key.Value << "\"" << Endl;
+            Print(*value, out, offset + 4);
+        }
+    }
+
+    TString TEntitiesIndex::PrintDebugString() const {
+        TStringStream res;
+        res << Endl;
+
+        Print(Idx_, res);
+
+        return res.Str();
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/entities_index.h b/library/cpp/tvmauth/client/misc/roles/entities_index.h
new file mode 100644
index 00000000000..bf42750d52d
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/entities_index.h
@@ -0,0 +1,107 @@
+#pragma once
+
+#include "types.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <set>
+#include <vector>
+
+namespace NTvmAuth::NRoles {
+    class TEntitiesIndex: TMoveOnly {
+    public:
+        struct TSubTree;
+        using TIdxByAttrs = THashMap<TKeyValue, TSubTree>;
+
+        struct TSubTree {
+            std::vector<TEntityPtr> Entities;
+            TIdxByAttrs SubTree;
+        };
+
+        class TStage {
+        public:
+            TStage(const std::set<TString>& k);
+
+            bool GetNextKeySet(std::vector<TString>& out);
+
+        private:
+            std::vector<TString> Keys_;
+            size_t Id_ = 0;
+        };
+
+    public:
+        TEntitiesIndex(const std::vector<TEntityPtr>& entities);
+
+        /**
+         * Iterators must be to sorted unique key/value
+         */
+        template <typename Iterator>
+        bool ContainsExactEntity(Iterator begin, Iterator end) const;
+
+        /**
+         * Iterators must be to sorted unique key/value
+         */
+        template <typename Iterator>
+        const std::vector<TEntityPtr>& GetEntitiesWithAttrs(Iterator begin, Iterator end) const;
+
+    public: // for tests
+        static std::set<TString> GetUniqueSortedKeys(const std::vector<TEntityPtr>& entities);
+        static void MakeUnique(TEntitiesIndex::TSubTree& branch);
+
+        TString PrintDebugString() const;
+
+    private:
+        template <typename Iterator>
+        const TSubTree* FindSubtree(Iterator begin, Iterator end, size_t& size) const;
+
+    private:
+        TSubTree Idx_;
+        std::vector<TEntityPtr> EmptyResult_;
+    };
+
+    template <typename Iterator>
+    bool TEntitiesIndex::ContainsExactEntity(Iterator begin, Iterator end) const {
+        size_t size = 0;
+        const TSubTree* subtree = FindSubtree(begin, end, size);
+        if (!subtree) {
+            return false;
+        }
+
+        auto res = std::find_if(
+            subtree->Entities.begin(),
+            subtree->Entities.end(),
+            [size](const auto& e) { return size == e->size(); });
+        return res != subtree->Entities.end();
+    }
+
+    template <typename Iterator>
+    const std::vector<TEntityPtr>& TEntitiesIndex::GetEntitiesWithAttrs(Iterator begin, Iterator end) const {
+        size_t size = 0;
+        const TSubTree* subtree = FindSubtree(begin, end, size);
+        if (!subtree) {
+            return EmptyResult_;
+        }
+
+        return subtree->Entities;
+    }
+
+    template <typename Iterator>
+    const TEntitiesIndex::TSubTree* TEntitiesIndex::FindSubtree(Iterator begin,
+                                                                Iterator end,
+                                                                size_t& size) const {
+        const TSubTree* subtree = &Idx_;
+        size = 0;
+
+        for (auto attr = begin; attr != end; ++attr) {
+            auto it = subtree->SubTree.find(TKeyValueView{attr->first, attr->second});
+            if (it == subtree->SubTree.end()) {
+                return nullptr;
+            }
+
+            ++size;
+            subtree = &it->second;
+        }
+
+        return subtree;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/parser.cpp b/library/cpp/tvmauth/client/misc/roles/parser.cpp
new file mode 100644
index 00000000000..eb991b57167
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/parser.cpp
@@ -0,0 +1,149 @@
+#include "parser.h"
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/string/cast.h>
+
+namespace NTvmAuth::NRoles {
+    static void GetRequiredValue(const NJson::TJsonValue& doc,
+                                 TStringBuf key,
+                                 NJson::TJsonValue& obj) {
+        Y_ENSURE(doc.GetValue(key, &obj), "Missing '" << key << "'");
+    }
+
+    static ui64 GetRequiredUInt(const NJson::TJsonValue& doc,
+                                TStringBuf key) {
+        NJson::TJsonValue obj;
+        GetRequiredValue(doc, key, obj);
+        Y_ENSURE(obj.IsUInteger(), "key '" << key << "' must be uint");
+        return obj.GetUInteger();
+    }
+
+    static bool GetOptionalMap(const NJson::TJsonValue& doc,
+                               TStringBuf key,
+                               NJson::TJsonValue& obj) {
+        if (!doc.GetValue(key, &obj)) {
+            return false;
+        }
+
+        Y_ENSURE(obj.IsMap(), "'" << key << "' must be object");
+        return true;
+    }
+
+    TRolesPtr TParser::Parse(TRawPtr decodedBlob) {
+        try {
+            return ParseImpl(decodedBlob);
+        } catch (const std::exception& e) {
+            throw yexception() << "Failed to parse roles from tirole: " << e.what()
+                               << ". '" << *decodedBlob << "'";
+        }
+    }
+
+    TRolesPtr TParser::ParseImpl(TRawPtr decodedBlob) {
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(*decodedBlob, &doc), "Invalid json");
+        Y_ENSURE(doc.IsMap(), "Json must be object");
+
+        TRoles::TTvmConsumers tvm = GetConsumers<TTvmId>(doc, "tvm");
+        TRoles::TUserConsumers user = GetConsumers<TUid>(doc, "user");
+
+        // fetch it last to provide more correct apply instant
+        TRoles::TMeta meta = GetMeta(doc);
+
+        return std::make_shared<TRoles>(
+            std::move(meta),
+            std::move(tvm),
+            std::move(user),
+            std::move(decodedBlob));
+    }
+
+    TRoles::TMeta TParser::GetMeta(const NJson::TJsonValue& doc) {
+        TRoles::TMeta res;
+
+        NJson::TJsonValue obj;
+        GetRequiredValue(doc, "revision", obj);
+        if (obj.IsString()) {
+            res.Revision = obj.GetString();
+        } else if (obj.IsUInteger()) {
+            res.Revision = ToString(obj.GetUInteger());
+        } else {
+            ythrow yexception() << "'revision' has unexpected type: " << obj.GetType();
+        }
+
+        res.BornTime = TInstant::Seconds(GetRequiredUInt(doc, "born_date"));
+
+        return res;
+    }
+
+    template <typename Id>
+    THashMap<Id, TConsumerRolesPtr> TParser::GetConsumers(const NJson::TJsonValue& doc,
+                                                          TStringBuf type) {
+        THashMap<Id, TConsumerRolesPtr> res;
+
+        NJson::TJsonValue obj;
+        if (!GetOptionalMap(doc, type, obj)) {
+            return res;
+        }
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsMap(),
+                     "roles for consumer must be map: '" << key << "' is " << value.GetType());
+
+            Id id = 0;
+            Y_ENSURE(TryIntFromString<10>(key, id),
+                     "id must be valid positive number of proper size for "
+                         << type << ". got '"
+                         << key << "'");
+
+            Y_ENSURE(res.emplace(id, GetConsumer(value, key)).second,
+                     "consumer duplicate detected: '" << key << "' for " << type);
+        }
+
+        return res;
+    }
+
+    TConsumerRolesPtr TParser::GetConsumer(const NJson::TJsonValue& obj, TStringBuf consumer) {
+        THashMap<TString, TEntitiesPtr> entities;
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsArray(),
+                     "entities for roles must be array: '" << key << "' is " << value.GetType());
+
+            entities.emplace(key, GetEntities(value, consumer, key));
+        }
+
+        return std::make_shared<TConsumerRoles>(std::move(entities));
+    }
+
+    TEntitiesPtr TParser::GetEntities(const NJson::TJsonValue& obj,
+                                      TStringBuf consumer,
+                                      TStringBuf role) {
+        std::vector<TEntityPtr> entities;
+        entities.reserve(obj.GetArray().size());
+
+        for (const NJson::TJsonValue& e : obj.GetArray()) {
+            Y_ENSURE(e.IsMap(),
+                     "role entity for role must be map: consumer '"
+                         << consumer << "' with role '" << role << "' has " << e.GetType());
+
+            entities.push_back(GetEntity(e, consumer, role));
+        }
+
+        return std::make_shared<TEntities>(TEntities(entities));
+    }
+
+    TEntityPtr TParser::GetEntity(const NJson::TJsonValue& obj, TStringBuf consumer, TStringBuf role) {
+        TEntityPtr res = std::make_shared<TEntity>();
+
+        for (const auto& [key, value] : obj.GetMap()) {
+            Y_ENSURE(value.IsString(),
+                     "entity is map (str->str), got value "
+                         << value.GetType() << ". consumer '"
+                         << consumer << "' with role '" << role << "'");
+
+            res->emplace(key, value.GetString());
+        }
+
+        return res;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/parser.h b/library/cpp/tvmauth/client/misc/roles/parser.h
new file mode 100644
index 00000000000..0982ba78c65
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/parser.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "roles.h"
+#include "types.h"
+
+namespace NJson {
+    class TJsonValue;
+}
+
+namespace NTvmAuth::NRoles {
+    class TParser {
+    public:
+        static TRolesPtr Parse(TRawPtr decodedBlob);
+
+    public:
+        static TRolesPtr ParseImpl(TRawPtr decodedBlob);
+        static TRoles::TMeta GetMeta(const NJson::TJsonValue& doc);
+
+        template <typename Id>
+        static THashMap<Id, TConsumerRolesPtr> GetConsumers(
+            const NJson::TJsonValue& doc,
+            TStringBuf key);
+
+        static TConsumerRolesPtr GetConsumer(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer);
+        static TEntitiesPtr GetEntities(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer,
+            TStringBuf role);
+        static TEntityPtr GetEntity(
+            const NJson::TJsonValue& obj,
+            TStringBuf consumer,
+            TStringBuf role);
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/roles.cpp b/library/cpp/tvmauth/client/misc/roles/roles.cpp
new file mode 100644
index 00000000000..f412558b991
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/roles.cpp
@@ -0,0 +1,101 @@
+#include "roles.h"
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+namespace NTvmAuth::NRoles {
+    TRoles::TRoles(TMeta&& meta,
+                   TTvmConsumers tvm,
+                   TUserConsumers user,
+                   TRawPtr raw)
+        : Meta_(std::move(meta))
+        , TvmIds_(std::move(tvm))
+        , Users_(std::move(user))
+        , Raw_(std::move(raw))
+    {
+        Y_ENSURE(Raw_);
+    }
+
+    TConsumerRolesPtr TRoles::GetRolesForService(const TCheckedServiceTicket& t) const {
+        Y_ENSURE_EX(t,
+                    TIllegalUsage() << "Service ticket must be valid, got: " << t.GetStatus());
+        auto it = TvmIds_.find(t.GetSrc());
+        return it == TvmIds_.end() ? TConsumerRolesPtr() : it->second;
+    }
+
+    TConsumerRolesPtr TRoles::GetRolesForUser(const TCheckedUserTicket& t,
+                                              std::optional<TUid> selectedUid) const {
+        Y_ENSURE_EX(t,
+                    TIllegalUsage() << "User ticket must be valid, got: " << t.GetStatus());
+        Y_ENSURE_EX(t.GetEnv() == EBlackboxEnv::ProdYateam,
+                    TIllegalUsage() << "User ticket must be from ProdYateam, got from " << t.GetEnv());
+
+        TUid uid = t.GetDefaultUid();
+        if (selectedUid) {
+            auto it = std::find(t.GetUids().begin(), t.GetUids().end(), *selectedUid);
+            Y_ENSURE_EX(it != t.GetUids().end(),
+                        TIllegalUsage() << "selectedUid must be in user ticket but it's not: "
+                                        << *selectedUid);
+            uid = *selectedUid;
+        }
+
+        auto it = Users_.find(uid);
+        return it == Users_.end() ? TConsumerRolesPtr() : it->second;
+    }
+
+    const TRoles::TMeta& TRoles::GetMeta() const {
+        return Meta_;
+    }
+
+    const TString& TRoles::GetRaw() const {
+        return *Raw_;
+    }
+
+    bool TRoles::CheckServiceRole(const TCheckedServiceTicket& t,
+                                  const TStringBuf roleName) const {
+        TConsumerRolesPtr c = GetRolesForService(t);
+        return c ? c->HasRole(roleName) : false;
+    }
+
+    bool TRoles::CheckUserRole(const TCheckedUserTicket& t,
+                               const TStringBuf roleName,
+                               std::optional<TUid> selectedUid) const {
+        TConsumerRolesPtr c = GetRolesForUser(t, selectedUid);
+        return c ? c->HasRole(roleName) : false;
+    }
+
+    bool TRoles::CheckServiceRoleForExactEntity(const TCheckedServiceTicket& t,
+                                                const TStringBuf roleName,
+                                                const TEntity& exactEntity) const {
+        TConsumerRolesPtr c = GetRolesForService(t);
+        return c ? c->CheckRoleForExactEntity(roleName, exactEntity) : false;
+    }
+
+    bool TRoles::CheckUserRoleForExactEntity(const TCheckedUserTicket& t,
+                                             const TStringBuf roleName,
+                                             const TEntity& exactEntity,
+                                             std::optional<TUid> selectedUid) const {
+        TConsumerRolesPtr c = GetRolesForUser(t, selectedUid);
+        return c ? c->CheckRoleForExactEntity(roleName, exactEntity) : false;
+    }
+
+    TConsumerRoles::TConsumerRoles(THashMap<TString, TEntitiesPtr> roles)
+        : Roles_(std::move(roles))
+    {
+    }
+
+    bool TConsumerRoles::CheckRoleForExactEntity(const TStringBuf roleName,
+                                                 const TEntity& exactEntity) const {
+        auto it = Roles_.find(roleName);
+        if (it == Roles_.end()) {
+            return false;
+        }
+
+        return it->second->Contains(exactEntity);
+    }
+
+    TEntities::TEntities(TEntitiesIndex idx)
+        : Idx_(std::move(idx))
+    {
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/roles.h b/library/cpp/tvmauth/client/misc/roles/roles.h
new file mode 100644
index 00000000000..00ffb7e070c
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/roles.h
@@ -0,0 +1,182 @@
+#pragma once
+
+#include "entities_index.h"
+#include "types.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/type.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/array_ref.h>
+#include <util/generic/hash.h>
+
+#include <vector>
+
+namespace NTvmAuth {
+    class TCheckedServiceTicket;
+    class TCheckedUserTicket;
+}
+
+namespace NTvmAuth::NRoles {
+    class TRoles {
+    public:
+        struct TMeta {
+            TString Revision;
+            TInstant BornTime;
+            TInstant Applied = TInstant::Now();
+        };
+
+        using TTvmConsumers = THashMap<TTvmId, TConsumerRolesPtr>;
+        using TUserConsumers = THashMap<TUid, TConsumerRolesPtr>;
+
+        TRoles(TMeta&& meta,
+               TTvmConsumers tvm,
+               TUserConsumers user,
+               TRawPtr raw);
+
+        /**
+         * @return ptr to roles. It will be nullptr if there are no roles
+         */
+        TConsumerRolesPtr GetRolesForService(const TCheckedServiceTicket& t) const;
+
+        /**
+         * @return ptr to roles. It will be nullptr if there are no roles
+         */
+        TConsumerRolesPtr GetRolesForUser(const TCheckedUserTicket& t,
+                                          std::optional<TUid> selectedUid = {}) const;
+
+        const TMeta& GetMeta() const;
+        const TString& GetRaw() const;
+
+    public: // shortcuts
+        /**
+         * @brief CheckServiceRole() is shortcut for simple role checking - for any possible entity
+         */
+        bool CheckServiceRole(
+            const TCheckedServiceTicket& t,
+            const TStringBuf roleName) const;
+
+        /**
+         * @brief CheckUserRole() is shortcut for simple role checking - for any possible entity
+         */
+        bool CheckUserRole(
+            const TCheckedUserTicket& t,
+            const TStringBuf roleName,
+            std::optional<TUid> selectedUid = {}) const;
+
+        /**
+         * @brief CheckServiceRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckServiceRoleForExactEntity(
+            const TCheckedServiceTicket& t,
+            const TStringBuf roleName,
+            const TEntity& exactEntity) const;
+
+        /**
+         * @brief CheckUserRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckUserRoleForExactEntity(
+            const TCheckedUserTicket& t,
+            const TStringBuf roleName,
+            const TEntity& exactEntity,
+            std::optional<TUid> selectedUid = {}) const;
+
+    private:
+        TMeta Meta_;
+        TTvmConsumers TvmIds_;
+        TUserConsumers Users_;
+        TRawPtr Raw_;
+    };
+
+    class TConsumerRoles {
+    public:
+        TConsumerRoles(THashMap<TString, TEntitiesPtr> roles);
+
+        bool HasRole(const TStringBuf roleName) const {
+            return Roles_.contains(roleName);
+        }
+
+        /**
+         * @return ptr to entries. It will be nullptr if there is no role
+         */
+        TEntitiesPtr GetEntitiesForRole(const TStringBuf roleName) const {
+            auto it = Roles_.find(roleName);
+            return it == Roles_.end() ? TEntitiesPtr() : it->second;
+        }
+
+        /**
+         * @brief CheckRoleForExactEntity() is shortcut for simple role checking for exact entity
+         */
+        bool CheckRoleForExactEntity(const TStringBuf roleName,
+                                     const TEntity& exactEntity) const;
+
+    private:
+        THashMap<TString, TEntitiesPtr> Roles_;
+    };
+
+    class TEntities {
+    public:
+        TEntities(TEntitiesIndex idx);
+
+        /**
+         * @brief Contains() provides info about entity presence
+         */
+        bool Contains(const TEntity& exactEntity) const {
+            return Idx_.ContainsExactEntity(exactEntity.begin(), exactEntity.end());
+        }
+
+        /**
+         * @brief The same as Contains()
+         * It checks span for sorted and unique properties.
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        bool ContainsSortedUnique(
+            const TArrayRef<const std::pair<StrKey, StrValue>>& exactEntity) const {
+            CheckSpan(exactEntity);
+            return Idx_.ContainsExactEntity(exactEntity.begin(), exactEntity.end());
+        }
+
+        /**
+         * @brief GetEntitiesWithAttrs() collects entities with ALL attributes from `attrs`
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        const std::vector<TEntityPtr>& GetEntitiesWithAttrs(
+            const std::map<StrKey, StrValue>& attrs) const {
+            return Idx_.GetEntitiesWithAttrs(attrs.begin(), attrs.end());
+        }
+
+        /**
+         * @brief The same as GetEntitiesWithAttrs()
+         * It checks span for sorted and unique properties.
+         */
+        template <class StrKey = TString, class StrValue = TString>
+        const std::vector<TEntityPtr>& GetEntitiesWithSortedUniqueAttrs(
+            const TArrayRef<const std::pair<StrKey, StrValue>>& attrs) const {
+            CheckSpan(attrs);
+            return Idx_.GetEntitiesWithAttrs(attrs.begin(), attrs.end());
+        }
+
+    private:
+        template <class StrKey, class StrValue>
+        static void CheckSpan(const TArrayRef<const std::pair<StrKey, StrValue>>& attrs) {
+            if (attrs.empty()) {
+                return;
+            }
+
+            auto prev = attrs.begin();
+            for (auto it = prev + 1; it != attrs.end(); ++it) {
+                Y_ENSURE_EX(prev->first != it->first,
+                            TIllegalUsage() << "attrs are not unique: '" << it->first << "'");
+                Y_ENSURE_EX(prev->first < it->first,
+                            TIllegalUsage() << "attrs are not sorted: '" << prev->first
+                                            << "' before '" << it->first << "'");
+
+                prev = it;
+            }
+        }
+
+    private:
+        TEntitiesIndex Idx_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/roles/types.h b/library/cpp/tvmauth/client/misc/roles/types.h
new file mode 100644
index 00000000000..e7614bf637d
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/roles/types.h
@@ -0,0 +1,68 @@
+#pragma once
+
+#include <util/generic/hash_set.h>
+
+#include <map>
+#include <memory>
+
+namespace NTvmAuth::NRoles {
+    using TEntity = std::map<TString, TString>;
+    using TEntityPtr = std::shared_ptr<TEntity>;
+
+    class TEntities;
+    using TEntitiesPtr = std::shared_ptr<TEntities>;
+
+    class TConsumerRoles;
+    using TConsumerRolesPtr = std::shared_ptr<TConsumerRoles>;
+
+    class TRoles;
+    using TRolesPtr = std::shared_ptr<TRoles>;
+
+    using TRawPtr = std::shared_ptr<TString>;
+
+    template <class T>
+    struct TKeyValueBase {
+        T Key;
+        T Value;
+
+        template <typename U>
+        bool operator==(const TKeyValueBase<U>& o) const {
+            return Key == o.Key && Value == o.Value;
+        }
+    };
+
+    using TKeyValue = TKeyValueBase<TString>;
+    using TKeyValueView = TKeyValueBase<TStringBuf>;
+}
+
+// Traits
+
+template <>
+struct THash<NTvmAuth::NRoles::TKeyValue> {
+    std::size_t operator()(const NTvmAuth::NRoles::TKeyValue& e) const {
+        return std::hash<std::string_view>()(e.Key) + std::hash<std::string_view>()(e.Value);
+    }
+
+    std::size_t operator()(const NTvmAuth::NRoles::TKeyValueView& e) const {
+        return std::hash<std::string_view>()(e.Key) + std::hash<std::string_view>()(e.Value);
+    }
+};
+
+template <>
+struct TEqualTo<NTvmAuth::NRoles::TKeyValue> {
+    using is_transparent = std::true_type;
+
+    template <typename T, typename U>
+    bool operator()(const NTvmAuth::NRoles::TKeyValueBase<T>& l,
+                    const NTvmAuth::NRoles::TKeyValueBase<U>& r) {
+        return l == r;
+    }
+};
+
+inline bool operator<(const NTvmAuth::NRoles::TEntityPtr& l, const NTvmAuth::NRoles::TEntityPtr& r) {
+    return *l < *r;
+}
+
+inline bool operator==(const NTvmAuth::NRoles::TEntityPtr& l, const NTvmAuth::NRoles::TEntityPtr& r) {
+    return *l == *r;
+}
diff --git a/library/cpp/tvmauth/client/misc/settings.h b/library/cpp/tvmauth/client/misc/settings.h
new file mode 100644
index 00000000000..8fae6c34d36
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/settings.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <util/generic/fwd.h>
+
+namespace NTvmAuth {
+    class TClientSettings {
+    public:
+        /*!
+         * Look at description in relevant settings: NTvmApi::TClientSettings or NTvmTool::TClientSettings
+         */
+        using TAlias = TString;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/src_checker.h b/library/cpp/tvmauth/client/misc/src_checker.h
new file mode 100644
index 00000000000..25e8e726025
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/src_checker.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include "async_updater.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_service_ticket.h>
+#include <library/cpp/tvmauth/src/service_impl.h>
+
+namespace NTvmAuth {
+    class TSrcChecker {
+    public:
+        TSrcChecker(TAsyncUpdaterPtr updater)
+            : Updater_(std::move(updater))
+        {
+            Y_ENSURE(Updater_);
+            GetCache();
+        }
+
+        /*!
+         * Checking must be enabled in TClientSettings
+         * Can throw exception if cache is out of date or wrong config
+         * @param ticket
+         */
+        TCheckedServiceTicket Check(TCheckedServiceTicket ticket) const {
+            NRoles::TConsumerRolesPtr roles = GetCache()->GetRolesForService(ticket);
+            if (roles) {
+                return ticket;
+            }
+
+            TServiceTicketImplPtr impl = THolder(NInternal::TCanningKnife::GetS(ticket));
+            impl->SetStatus(ETicketStatus::NoRoles);
+            return TCheckedServiceTicket(std::move(impl));
+        }
+
+    private:
+        NRoles::TRolesPtr GetCache() const {
+            NRoles::TRolesPtr c = Updater_->GetRoles();
+            Y_ENSURE_EX(c, TBrokenTvmClientSettings() << "Need to use TClientSettings::EnableRolesFetching()");
+            return c;
+        }
+
+    private:
+        TAsyncUpdaterPtr Updater_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/threaded_updater.cpp
new file mode 100644
index 00000000000..5d21ce67a75
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/threaded_updater.cpp
@@ -0,0 +1,111 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <util/string/builder.h>
+#include <util/system/spin_wait.h>
+#include <util/system/thread.h>
+
+namespace NTvmAuth {
+    TThreadedUpdaterBase::TThreadedUpdaterBase(TDuration workerAwakingPeriod,
+                                               TLoggerPtr logger,
+                                               const TString& url,
+                                               ui16 port,
+                                               TDuration socketTimeout,
+                                               TDuration connectTimeout)
+        : WorkerAwakingPeriod_(workerAwakingPeriod)
+        , Logger_(std::move(logger))
+        , TvmUrl_(url)
+        , TvmPort_(port)
+        , TvmSocketTimeout_(socketTimeout)
+        , TvmConnectTimeout_(connectTimeout)
+        , IsStopped_(true)
+    {
+        Y_ENSURE_EX(Logger_, TNonRetriableException() << "Logger is required");
+
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Hours(1);
+        ServiceTicketsDurations_.Expiring = TDuration::Hours(2);
+        ServiceTicketsDurations_.Invalid = TDuration::Hours(11);
+
+        PublicKeysDurations_.RefreshPeriod = TDuration::Days(1);
+        PublicKeysDurations_.Expiring = TDuration::Days(2);
+        PublicKeysDurations_.Invalid = TDuration::Days(6);
+    }
+
+    TThreadedUpdaterBase::~TThreadedUpdaterBase() {
+        StopWorker();
+    }
+
+    void TThreadedUpdaterBase::StartWorker() {
+        if (HttpClient_) {
+            HttpClient_->ResetConnection();
+        }
+        Thread_ = MakeHolder<TThread>(WorkerWrap, this);
+        Thread_->Start();
+        Started_.Wait();
+        IsStopped_ = false;
+    }
+
+    void TThreadedUpdaterBase::StopWorker() {
+        Event_.Signal();
+        if (Thread_) {
+            Thread_.Reset();
+        }
+    }
+
+    TKeepAliveHttpClient& TThreadedUpdaterBase::GetClient() const {
+        if (!HttpClient_) {
+            HttpClient_ = MakeHolder<TKeepAliveHttpClient>(TvmUrl_, TvmPort_, TvmSocketTimeout_, TvmConnectTimeout_);
+        }
+
+        return *HttpClient_;
+    }
+
+    void TThreadedUpdaterBase::LogDebug(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Debug(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogInfo(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Info(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogWarning(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Warning(msg);
+        }
+    }
+
+    void TThreadedUpdaterBase::LogError(const TString& msg) const {
+        if (Logger_) {
+            Logger_->Error(msg);
+        }
+    }
+
+    void* TThreadedUpdaterBase::WorkerWrap(void* arg) {
+        TThread::SetCurrentThreadName("TicketParserUpd");
+        TThreadedUpdaterBase& this_ = *reinterpret_cast<TThreadedUpdaterBase*>(arg);
+        this_.Started_.Signal();
+        this_.LogDebug("Thread-worker started");
+
+        while (true) {
+            if (this_.Event_.WaitT(this_.WorkerAwakingPeriod_)) {
+                break;
+            }
+
+            try {
+                this_.Worker();
+                this_.GetClient().ResetConnection();
+            } catch (const std::exception& e) { // impossible now
+                this_.LogError(TStringBuilder() << "Failed to generate new cache: " << e.what());
+            }
+        }
+
+        this_.LogDebug("Thread-worker stopped");
+        this_.IsStopped_ = true;
+        return nullptr;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/threaded_updater.h b/library/cpp/tvmauth/client/misc/threaded_updater.h
new file mode 100644
index 00000000000..783684ba3be
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/threaded_updater.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include "async_updater.h"
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/ptr.h>
+#include <util/system/event.h>
+#include <util/system/thread.h>
+
+class TKeepAliveHttpClient;
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife;
+}
+namespace NTvmAuth {
+    class TThreadedUpdaterBase: public TAsyncUpdaterBase {
+    public:
+        TThreadedUpdaterBase(TDuration workerAwakingPeriod,
+                             TLoggerPtr logger,
+                             const TString& url,
+                             ui16 port,
+                             TDuration socketTimeout,
+                             TDuration connectTimeout);
+        virtual ~TThreadedUpdaterBase();
+
+    protected:
+        void StartWorker();
+        void StopWorker();
+
+        virtual void Worker() {
+        }
+
+        TKeepAliveHttpClient& GetClient() const;
+
+        void LogDebug(const TString& msg) const;
+        void LogInfo(const TString& msg) const;
+        void LogWarning(const TString& msg) const;
+        void LogError(const TString& msg) const;
+
+    protected:
+        TDuration WorkerAwakingPeriod_;
+
+        const TLoggerPtr Logger_;
+
+    protected:
+        const TString TvmUrl_;
+
+    private:
+        static void* WorkerWrap(void* arg);
+
+        void StartTvmClientStopping() const override {
+            Event_.Signal();
+        }
+
+        bool IsTvmClientStopped() const override {
+            return IsStopped_;
+        }
+
+    private:
+        mutable THolder<TKeepAliveHttpClient> HttpClient_;
+
+        const ui32 TvmPort_;
+        const TDuration TvmSocketTimeout_;
+        const TDuration TvmConnectTimeout_;
+
+        mutable TAutoEvent Event_;
+        mutable TAutoEvent Started_;
+        std::atomic_bool IsStopped_;
+        THolder<TThread> Thread_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/meta_info.cpp b/library/cpp/tvmauth/client/misc/tool/meta_info.cpp
new file mode 100644
index 00000000000..5d905b0cb8c
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/meta_info.cpp
@@ -0,0 +1,200 @@
+#include "meta_info.h"
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/string/builder.h>
+
+namespace NTvmAuth::NTvmTool {
+    TString TMetaInfo::TConfig::ToString() const {
+        TStringStream s;
+        s << "self_tvm_id=" << SelfTvmId << ", "
+          << "bb_env=" << BbEnv << ", "
+          << "dsts=[";
+
+        for (const auto& pair : DstAliases) {
+            s << "(" << pair.first << ":" << pair.second << ")";
+        }
+
+        s << "]";
+
+        return std::move(s.Str());
+    }
+
+    TMetaInfo::TMetaInfo(TLoggerPtr logger)
+        : Logger_(std::move(logger))
+    {
+    }
+
+    TMetaInfo::TConfigPtr TMetaInfo::Init(TKeepAliveHttpClient& client,
+                                          const TClientSettings& settings) {
+        ApplySettings(settings);
+
+        TryPing(client);
+        const TString metaString = Fetch(client);
+        if (Logger_) {
+            TStringStream s;
+            s << "Meta info fetched from " << settings.GetHostname() << ":" << settings.GetPort();
+            Logger_->Debug(s.Str());
+        }
+
+        try {
+            Config_.Set(ParseMetaString(metaString, SelfAlias_));
+        } catch (const yexception& e) {
+            ythrow TNonRetriableException() << "Malformed json from tvmtool: " << e.what();
+        }
+        TConfigPtr cfg = Config_.Get();
+        Y_ENSURE_EX(cfg, TNonRetriableException() << "Alias '" << SelfAlias_ << "' not found in meta info");
+
+        if (Logger_) {
+            Logger_->Info("Meta: " + cfg->ToString());
+        }
+
+        return cfg;
+    }
+
+    TString TMetaInfo::GetRequestForTickets(const TConfig& config) {
+        Y_ENSURE(!config.DstAliases.empty());
+
+        TStringStream s;
+        s << "/tvm/tickets"
+          << "?src=" << config.SelfTvmId
+          << "&dsts=";
+
+        for (const auto& pair : config.DstAliases) {
+            s << pair.second << ","; // avoid aliases - url-encoding required
+        }
+        s.Str().pop_back();
+
+        return s.Str();
+    }
+
+    bool TMetaInfo::TryUpdateConfig(TKeepAliveHttpClient& client) {
+        const TString metaString = Fetch(client);
+
+        TConfigPtr config;
+        try {
+            config = ParseMetaString(metaString, SelfAlias_);
+        } catch (const yexception& e) {
+            ythrow TNonRetriableException() << "Malformed json from tvmtool: " << e.what();
+        }
+        Y_ENSURE_EX(config, TNonRetriableException() << "Alias '" << SelfAlias_ << "' not found in meta info");
+
+        TConfigPtr oldConfig = Config_.Get();
+        if (*config == *oldConfig) {
+            return false;
+        }
+
+        if (Logger_) {
+            Logger_->Info(TStringBuilder()
+                          << "Meta was updated. Old: (" << oldConfig->ToString()
+                          << "). New: (" << config->ToString() << ")");
+        }
+
+        Config_ = config;
+        return true;
+    }
+
+    void TMetaInfo::TryPing(TKeepAliveHttpClient& client) {
+        try {
+            TStringStream s;
+            TKeepAliveHttpClient::THttpCode code = client.DoGet("/tvm/ping", &s);
+            if (code < 200 || 300 <= code) {
+                throw yexception() << "(" << code << ") " << s.Str();
+            }
+        } catch (const std::exception& e) {
+            ythrow TNonRetriableException() << "Failed to connect to tvmtool: " << e.what();
+        }
+    }
+
+    TString TMetaInfo::Fetch(TKeepAliveHttpClient& client) const {
+        TStringStream res;
+        TKeepAliveHttpClient::THttpCode code;
+        try {
+            code = client.DoGet("/tvm/private_api/__meta__", &res, AuthHeader_);
+        } catch (const std::exception& e) {
+            ythrow TRetriableException() << "Failed to fetch meta data from tvmtool: " << e.what();
+        }
+
+        if (code != 200) {
+            Y_ENSURE_EX(code != 404,
+                        TNonRetriableException() << "Library does not support so old tvmtool. You need tvmtool>=1.1.0");
+
+            TStringStream err;
+            err << "Failed to fetch meta from tvmtool: " << client.GetHost() << ":" << client.GetPort()
+                << " (" << code << "): " << res.Str();
+            Y_ENSURE_EX(!(500 <= code && code < 600), TRetriableException() << err.Str());
+            ythrow TNonRetriableException() << err.Str();
+        }
+
+        return res.Str();
+    }
+
+    static TMetaInfo::TDstAliases::value_type ParsePair(const NJson::TJsonValue& val, const TString& meta) {
+        NJson::TJsonValue jAlias;
+        Y_ENSURE(val.GetValue("alias", &jAlias), meta);
+        Y_ENSURE(jAlias.IsString(), meta);
+
+        NJson::TJsonValue jClientId;
+        Y_ENSURE(val.GetValue("client_id", &jClientId), meta);
+        Y_ENSURE(jClientId.IsInteger(), meta);
+
+        return {jAlias.GetString(), jClientId.GetInteger()};
+    }
+
+    TMetaInfo::TConfigPtr TMetaInfo::ParseMetaString(const TString& meta, const TString& self) {
+        NJson::TJsonValue jDoc;
+        Y_ENSURE(NJson::ReadJsonTree(meta, &jDoc), meta);
+
+        NJson::TJsonValue jEnv;
+        Y_ENSURE(jDoc.GetValue("bb_env", &jEnv), meta);
+
+        NJson::TJsonValue jTenants;
+        Y_ENSURE(jDoc.GetValue("tenants", &jTenants), meta);
+        Y_ENSURE(jTenants.IsArray(), meta);
+
+        for (const NJson::TJsonValue& jTen : jTenants.GetArray()) {
+            NJson::TJsonValue jSelf;
+            Y_ENSURE(jTen.GetValue("self", &jSelf), meta);
+            auto selfPair = ParsePair(jSelf, meta);
+            if (selfPair.first != self) {
+                continue;
+            }
+
+            TConfigPtr config = std::make_shared<TConfig>();
+            config->SelfTvmId = selfPair.second;
+            config->BbEnv = BbEnvFromString(jEnv.GetString(), meta);
+
+            NJson::TJsonValue jDsts;
+            Y_ENSURE(jTen.GetValue("dsts", &jDsts), meta);
+            Y_ENSURE(jDsts.IsArray(), meta);
+            for (const NJson::TJsonValue& jDst : jDsts.GetArray()) {
+                config->DstAliases.insert(ParsePair(jDst, meta));
+            }
+
+            return config;
+        }
+
+        return {};
+    }
+
+    void TMetaInfo::ApplySettings(const TClientSettings& settings) {
+        AuthHeader_ = {{"Authorization", settings.GetAuthToken()}};
+        SelfAlias_ = settings.GetSelfAlias();
+    }
+
+    EBlackboxEnv TMetaInfo::BbEnvFromString(const TString& env, const TString& meta) {
+        if (env == "Prod") {
+            return EBlackboxEnv::Prod;
+        } else if (env == "Test") {
+            return EBlackboxEnv::Test;
+        } else if (env == "ProdYaTeam") {
+            return EBlackboxEnv::ProdYateam;
+        } else if (env == "TestYaTeam") {
+            return EBlackboxEnv::TestYateam;
+        } else if (env == "Stress") {
+            return EBlackboxEnv::Stress;
+        }
+
+        ythrow yexception() << "'bb_env'=='" << env << "'. " << meta;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/meta_info.h b/library/cpp/tvmauth/client/misc/tool/meta_info.h
new file mode 100644
index 00000000000..c4b9688e39b
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/meta_info.h
@@ -0,0 +1,67 @@
+#pragma once
+
+#include "settings.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/http/simple/http_client.h>
+
+namespace NTvmAuth::NTvmTool {
+    class TMetaInfo {
+    public:
+        using TDstAliases = THashMap<TClientSettings::TAlias, TTvmId>;
+
+        struct TConfig {
+            TTvmId SelfTvmId = 0;
+            EBlackboxEnv BbEnv = EBlackboxEnv::Prod;
+            TDstAliases DstAliases;
+
+            bool AreTicketsRequired() const {
+                return !DstAliases.empty();
+            }
+
+            TString ToString() const;
+
+            bool operator==(const TConfig& c) const {
+                return SelfTvmId == c.SelfTvmId &&
+                       BbEnv == c.BbEnv &&
+                       DstAliases == c.DstAliases;
+            }
+        };
+        using TConfigPtr = std::shared_ptr<TConfig>;
+
+    public:
+        TMetaInfo(TLoggerPtr logger);
+
+        TConfigPtr Init(TKeepAliveHttpClient& client,
+                        const TClientSettings& settings);
+
+        static TString GetRequestForTickets(const TMetaInfo::TConfig& config);
+
+        const TKeepAliveHttpClient::THeaders& GetAuthHeader() const {
+            return AuthHeader_;
+        }
+
+        TConfigPtr GetConfig() const {
+            return Config_.Get();
+        }
+
+        bool TryUpdateConfig(TKeepAliveHttpClient& client);
+
+    protected:
+        void TryPing(TKeepAliveHttpClient& client);
+        TString Fetch(TKeepAliveHttpClient& client) const;
+        static TConfigPtr ParseMetaString(const TString& meta, const TString& self);
+        void ApplySettings(const TClientSettings& settings);
+        static EBlackboxEnv BbEnvFromString(const TString& env, const TString& meta);
+
+    protected:
+        NUtils::TProtectedValue<TConfigPtr> Config_;
+        TKeepAliveHttpClient::THeaders AuthHeader_;
+
+        TLoggerPtr Logger_;
+        TString SelfAlias_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/settings.cpp b/library/cpp/tvmauth/client/misc/tool/settings.cpp
new file mode 100644
index 00000000000..894501f19d2
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/settings.cpp
@@ -0,0 +1,37 @@
+#include "settings.h"
+
+#include <library/cpp/string_utils/url/url.h>
+
+#include <util/system/env.h>
+
+namespace NTvmAuth::NTvmTool {
+    TClientSettings::TClientSettings(const TAlias& selfAias)
+        : SelfAias_(selfAias)
+        , Hostname_("localhost")
+        , Port_(1)
+        , SocketTimeout_(TDuration::Seconds(5))
+        , ConnectTimeout_(TDuration::Seconds(30))
+    {
+        AuthToken_ = GetEnv("TVMTOOL_LOCAL_AUTHTOKEN");
+        if (!AuthToken_) {
+            AuthToken_ = GetEnv("QLOUD_TVM_TOKEN");
+        }
+        TStringBuf auth(AuthToken_);
+        FixSpaces(auth);
+        AuthToken_ = auth;
+
+        const TString url = GetEnv("DEPLOY_TVM_TOOL_URL");
+        if (url) {
+            TStringBuf scheme, host;
+            TryGetSchemeHostAndPort(url, scheme, host, Port_);
+        }
+
+        Y_ENSURE_EX(SelfAias_, TBrokenTvmClientSettings() << "Alias for your TVM client cannot be empty");
+    }
+
+    void TClientSettings::FixSpaces(TStringBuf& str) {
+        while (str && isspace(str.back())) {
+            str.Chop(1);
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/settings.h b/library/cpp/tvmauth/client/misc/tool/settings.h
new file mode 100644
index 00000000000..63255ed090b
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/settings.h
@@ -0,0 +1,137 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/misc/settings.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+
+#include <library/cpp/tvmauth/checked_user_ticket.h>
+
+#include <util/datetime/base.h>
+#include <util/generic/maybe.h>
+
+namespace NTvmAuth::NTvmTool {
+    /**
+     * Uses local http-interface to get state: http://localhost/tvm/.
+     * This interface can be provided with tvmtool (local daemon) or Qloud/YP (local http api in container).
+     * See more: https://wiki.yandex-team.ru/passport/tvm2/qloud/.
+     *
+     * Most part of settings will be fetched from tvmtool on start of client.
+     * You need to use aliases for TVM-clients (src and dst) which you specified in tvmtool or Qloud/YP interface
+     */
+    class TClientSettings: public NTvmAuth::TClientSettings {
+    public:
+        /*!
+         * Sets default values:
+         * - hostname == "localhost"
+         * - port detected with env["DEPLOY_TVM_TOOL_URL"] (provided with Yandex.Deploy),
+         *      otherwise port == 1 (it is ok for Qloud)
+         * - authToken: env["TVMTOOL_LOCAL_AUTHTOKEN"] (provided with Yandex.Deploy),
+         *      otherwise env["QLOUD_TVM_TOKEN"] (provided with Qloud)
+         *
+         * AuthToken is protection from SSRF.
+         *
+         * @param selfAias - alias for your TVM client, which you specified in tvmtool or YD interface
+         */
+        TClientSettings(const TAlias& selfAias);
+
+        /*!
+         * Look at comment for ctor
+         * @param port
+         */
+        TClientSettings& SetPort(ui16 port) {
+            Port_ = port;
+            return *this;
+        }
+
+        /*!
+         * Default value: hostname == "localhost"
+         * @param hostname
+         */
+        TClientSettings& SetHostname(const TString& hostname) {
+            Y_ENSURE_EX(hostname, TBrokenTvmClientSettings() << "Hostname cannot be empty");
+            Hostname_ = hostname;
+            return *this;
+        }
+
+        TClientSettings& SetSocketTimeout(TDuration socketTimeout) {
+            SocketTimeout_ = socketTimeout;
+            return *this;
+        }
+
+        TClientSettings& SetConnectTimeout(TDuration connectTimeout) {
+            ConnectTimeout_ = connectTimeout;
+            return *this;
+        }
+
+        /*!
+         * Look at comment for ctor
+         * @param token
+         */
+        TClientSettings& SetAuthToken(TStringBuf token) {
+            FixSpaces(token);
+            Y_ENSURE_EX(token, TBrokenTvmClientSettings() << "Auth token cannot be empty");
+            AuthToken_ = token;
+            return *this;
+        }
+
+        /*!
+          * Blackbox environmet is provided by tvmtool for client.
+          * You can override it for your purpose with limitations:
+          *   (env from tvmtool) -> (override)
+          *  - Prod/ProdYateam -> Prod/ProdYateam
+          *  - Test/TestYateam -> Test/TestYateam
+          *  - Stress -> Stress
+          *
+          * You can contact tvm-dev@yandex-team.ru if limitations are too strict
+          * @param env
+          */
+        TClientSettings& OverrideBlackboxEnv(EBlackboxEnv env) {
+            BbEnv_ = env;
+            return *this;
+        }
+
+    public: // for TAsyncUpdaterBase
+        const TAlias& GetSelfAlias() const {
+            return SelfAias_;
+        }
+
+        const TString& GetHostname() const {
+            return Hostname_;
+        }
+
+        ui16 GetPort() const {
+            return Port_;
+        }
+
+        TDuration GetSocketTimeout() const {
+            return SocketTimeout_;
+        }
+
+        TDuration GetConnectTimeout() const {
+            return ConnectTimeout_;
+        }
+
+        const TString& GetAuthToken() const {
+            Y_ENSURE_EX(AuthToken_, TBrokenTvmClientSettings()
+                                        << "Auth token cannot be empty. "
+                                        << "Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+            return AuthToken_;
+        }
+
+        TMaybe<EBlackboxEnv> GetOverridedBlackboxEnv() const {
+            return BbEnv_;
+        }
+
+    private:
+        void FixSpaces(TStringBuf& str);
+
+    private:
+        TAlias SelfAias_;
+        TString Hostname_;
+        ui16 Port_;
+        TDuration SocketTimeout_;
+        TDuration ConnectTimeout_;
+        TString AuthToken_;
+        TMaybe<EBlackboxEnv> BbEnv_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp b/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp
new file mode 100644
index 00000000000..8490f7ab546
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/threaded_updater.cpp
@@ -0,0 +1,331 @@
+#include "threaded_updater.h"
+
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/json/json_reader.h>
+
+#include <util/generic/hash_set.h>
+#include <util/stream/str.h>
+#include <util/string/ascii.h>
+#include <util/string/builder.h>
+#include <util/string/cast.h>
+
+namespace NTvmAuth::NTvmTool {
+    TAsyncUpdaterPtr TThreadedUpdater::Create(const TClientSettings& settings, TLoggerPtr logger) {
+        Y_ENSURE_EX(logger, TNonRetriableException() << "Logger is required");
+        THolder<TThreadedUpdater> p(new TThreadedUpdater(
+            settings.GetHostname(),
+            settings.GetPort(),
+            settings.GetSocketTimeout(),
+            settings.GetConnectTimeout(),
+            std::move(logger)));
+        p->Init(settings);
+        p->StartWorker();
+        return p.Release();
+    }
+
+    TThreadedUpdater::~TThreadedUpdater() {
+        StopWorker(); // Required here to avoid using of deleted members
+    }
+
+    TClientStatus TThreadedUpdater::GetStatus() const {
+        const TClientStatus::ECode state = GetState();
+        return TClientStatus(state, GetLastError(state == TClientStatus::Ok));
+    }
+
+    TClientStatus::ECode TThreadedUpdater::GetState() const {
+        const TInstant now = TInstant::Now();
+        const TMetaInfo::TConfigPtr config = MetaInfo_.GetConfig();
+
+        if ((config->AreTicketsRequired() && AreServiceTicketsInvalid(now)) || ArePublicKeysInvalid(now)) {
+            return TClientStatus::Error;
+        }
+
+        if (config->AreTicketsRequired()) {
+            if (!GetCachedServiceTickets() || config->DstAliases.size() > GetCachedServiceTickets()->TicketsByAlias.size()) {
+                return TClientStatus::Error;
+            }
+        }
+
+        const TDuration st = now - GetUpdateTimeOfServiceTickets();
+        const TDuration pk = now - GetUpdateTimeOfPublicKeys();
+
+        if ((config->AreTicketsRequired() && st > ServiceTicketsDurations_.Expiring) || pk > PublicKeysDurations_.Expiring) {
+            return TClientStatus::Warning;
+        }
+
+        if (IsConfigWarnTime()) {
+            return TClientStatus::Warning;
+        }
+
+        return TClientStatus::Ok;
+    }
+
+    TThreadedUpdater::TThreadedUpdater(const TString& host, ui16 port, TDuration socketTimeout, TDuration connectTimeout, TLoggerPtr logger)
+        : TThreadedUpdaterBase(TDuration::Seconds(5), logger, host, port, socketTimeout, connectTimeout)
+        , MetaInfo_(logger)
+        , ConfigWarnDelay_(TDuration::Seconds(30))
+    {
+        ServiceTicketsDurations_.RefreshPeriod = TDuration::Minutes(10);
+        PublicKeysDurations_.RefreshPeriod = TDuration::Minutes(10);
+    }
+
+    void TThreadedUpdater::Init(const TClientSettings& settings) {
+        const TMetaInfo::TConfigPtr config = MetaInfo_.Init(GetClient(), settings);
+        LastVisitForConfig_ = TInstant::Now();
+
+        SetBbEnv(config->BbEnv, settings.GetOverridedBlackboxEnv());
+        if (settings.GetOverridedBlackboxEnv()) {
+            LogInfo(TStringBuilder()
+                    << "Meta: override blackbox env: " << config->BbEnv
+                    << "->" << *settings.GetOverridedBlackboxEnv());
+        }
+
+        ui8 tries = 3;
+        do {
+            UpdateState();
+        } while (!IsEverythingOk(*config) && --tries > 0);
+
+        if (!IsEverythingOk(*config)) {
+            ThrowLastError();
+        }
+    }
+
+    void TThreadedUpdater::UpdateState() {
+        bool wasUpdated = false;
+        try {
+            wasUpdated = MetaInfo_.TryUpdateConfig(GetClient());
+            LastVisitForConfig_ = TInstant::Now();
+            ClearError(EScope::TvmtoolConfig);
+        } catch (const std::exception& e) {
+            ProcessError(EType::Retriable, EScope::TvmtoolConfig, e.what());
+            LogWarning(TStringBuilder() << "Error while fetching of tvmtool config: " << e.what());
+        }
+        if (IsConfigWarnTime()) {
+            LogError(TStringBuilder() << "Tvmtool config have not been refreshed for too long period");
+        }
+
+        TMetaInfo::TConfigPtr config = MetaInfo_.GetConfig();
+
+        if (wasUpdated || IsTimeToUpdateServiceTickets(*config, LastVisitForServiceTickets_)) {
+            try {
+                const TInstant updateTime = UpdateServiceTickets(*config);
+                SetUpdateTimeOfServiceTickets(updateTime);
+                LastVisitForServiceTickets_ = TInstant::Now();
+
+                if (AreServiceTicketsOk(*config)) {
+                    ClearError(EScope::ServiceTickets);
+                }
+                LogDebug(TStringBuilder() << "Tickets fetched from tvmtool: " << updateTime);
+            } catch (const std::exception& e) {
+                ProcessError(EType::Retriable, EScope::ServiceTickets, e.what());
+                LogWarning(TStringBuilder() << "Error while fetching of tickets: " << e.what());
+            }
+
+            if (TInstant::Now() - GetUpdateTimeOfServiceTickets() > ServiceTicketsDurations_.Expiring) {
+                LogError("Service tickets have not been refreshed for too long period");
+            }
+        }
+
+        if (wasUpdated || IsTimeToUpdatePublicKeys(LastVisitForPublicKeys_)) {
+            try {
+                const TInstant updateTime = UpdateKeys(*config);
+                SetUpdateTimeOfPublicKeys(updateTime);
+                LastVisitForPublicKeys_ = TInstant::Now();
+
+                if (ArePublicKeysOk()) {
+                    ClearError(EScope::PublicKeys);
+                }
+                LogDebug(TStringBuilder() << "Public keys fetched from tvmtool: " << updateTime);
+            } catch (const std::exception& e) {
+                ProcessError(EType::Retriable, EScope::PublicKeys, e.what());
+                LogWarning(TStringBuilder() << "Error while fetching of public keys: " << e.what());
+            }
+
+            if (TInstant::Now() - GetUpdateTimeOfPublicKeys() > PublicKeysDurations_.Expiring) {
+                LogError("Public keys have not been refreshed for too long period");
+            }
+        }
+    }
+
+    TInstant TThreadedUpdater::UpdateServiceTickets(const TMetaInfo::TConfig& config) {
+        const std::pair<TString, TInstant> tickets = FetchServiceTickets(config);
+
+        if (TInstant::Now() - tickets.second >= ServiceTicketsDurations_.Invalid) {
+            throw yexception() << "Service tickets are too old: " << tickets.second;
+        }
+
+        TPairTicketsErrors p = ParseFetchTicketsResponse(tickets.first, config.DstAliases);
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(std::move(p.Tickets),
+                                                              std::move(p.Errors),
+                                                              config.DstAliases));
+        return tickets.second;
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::FetchServiceTickets(const TMetaInfo::TConfig& config) const {
+        TStringStream s;
+        THttpHeaders headers;
+
+        const TString request = TMetaInfo::GetRequestForTickets(config);
+        auto code = GetClient().DoGet(request, &s, MetaInfo_.GetAuthHeader(), &headers);
+        Y_ENSURE(code == 200, ProcessHttpError(EScope::ServiceTickets, request, code, s.Str()));
+
+        return {s.Str(), GetBirthTimeFromResponse(headers, "tickets")};
+    }
+
+    static THashSet<TTvmId> GetAllTvmIds(const TMetaInfo::TDstAliases& dsts) {
+        THashSet<TTvmId> res;
+        res.reserve(dsts.size());
+
+        for (const auto& pair : dsts) {
+            res.insert(pair.second);
+        }
+
+        return res;
+    }
+
+    TAsyncUpdaterBase::TPairTicketsErrors TThreadedUpdater::ParseFetchTicketsResponse(const TString& resp,
+                                                                                      const TMetaInfo::TDstAliases& dsts) const {
+        const THashSet<TTvmId> allTvmIds = GetAllTvmIds(dsts);
+
+        TServiceTickets::TMapIdStr tickets;
+        TServiceTickets::TMapIdStr errors;
+
+        auto procErr = [this](const TString& msg) {
+            ProcessError(EType::NonRetriable, EScope::ServiceTickets, msg);
+            LogError(msg);
+        };
+
+        NJson::TJsonValue doc;
+        Y_ENSURE(NJson::ReadJsonTree(resp, &doc), "Invalid json from tvmtool: " << resp);
+
+        for (const auto& pair : doc.GetMap()) {
+            NJson::TJsonValue tvmId;
+            unsigned long long tvmIdNum = 0;
+
+            if (!pair.second.GetValue("tvm_id", &tvmId) ||
+                !tvmId.GetUInteger(&tvmIdNum)) {
+                procErr(TStringBuilder()
+                        << "Failed to get 'tvm_id' from key, should never happend '"
+                        << pair.first << "': " << resp);
+                continue;
+            }
+
+            if (!allTvmIds.contains(tvmIdNum)) {
+                continue;
+            }
+
+            NJson::TJsonValue val;
+            if (!pair.second.GetValue("ticket", &val)) {
+                TString err;
+                if (pair.second.GetValue("error", &val)) {
+                    err = val.GetString();
+                } else {
+                    err = "Failed to get 'ticket' and 'error', should never happend: " + pair.first;
+                }
+
+                procErr(TStringBuilder()
+                        << "Failed to get ServiceTicket for " << pair.first
+                        << " (" << tvmIdNum << "): " << err);
+
+                errors.insert({tvmIdNum, std::move(err)});
+                continue;
+            }
+
+            tickets.insert({tvmIdNum, val.GetString()});
+        }
+
+        // This work-around is required because of bug in old verions of tvmtool: PASSP-24829
+        for (const auto& pair : dsts) {
+            if (!tickets.contains(pair.second) && !errors.contains(pair.second)) {
+                TString err = "Missing tvm_id in response, should never happend: " + pair.first;
+
+                procErr(TStringBuilder()
+                        << "Failed to get ServiceTicket for " << pair.first
+                        << " (" << pair.second << "): " << err);
+
+                errors.emplace(pair.second, std::move(err));
+            }
+        }
+
+        return {std::move(tickets), std::move(errors)};
+    }
+
+    TInstant TThreadedUpdater::UpdateKeys(const TMetaInfo::TConfig& config) {
+        const std::pair<TString, TInstant> keys = FetchPublicKeys();
+
+        if (TInstant::Now() - keys.second >= PublicKeysDurations_.Invalid) {
+            throw yexception() << "Public keys are too old: " << keys.second;
+        }
+
+        SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(config.SelfTvmId, keys.first)));
+        SetUserContext(keys.first);
+
+        return keys.second;
+    }
+
+    std::pair<TString, TInstant> TThreadedUpdater::FetchPublicKeys() const {
+        TStringStream s;
+        THttpHeaders headers;
+
+        auto code = GetClient().DoGet("/tvm/keys", &s, MetaInfo_.GetAuthHeader(), &headers);
+        Y_ENSURE(code == 200, ProcessHttpError(EScope::PublicKeys, "/tvm/keys", code, s.Str()));
+
+        return {s.Str(), GetBirthTimeFromResponse(headers, "public keys")};
+    }
+
+    TInstant TThreadedUpdater::GetBirthTimeFromResponse(const THttpHeaders& headers, TStringBuf errMsg) {
+        auto it = std::find_if(headers.begin(),
+                               headers.end(),
+                               [](const THttpInputHeader& h) {
+                                   return AsciiEqualsIgnoreCase(h.Name(), "X-Ya-Tvmtool-Data-Birthtime");
+                               });
+        Y_ENSURE(it != headers.end(), "Failed to fetch bithtime of " << errMsg << " from tvmtool");
+
+        ui64 time = 0;
+        Y_ENSURE(TryIntFromString<10>(it->Value(), time),
+                 "Bithtime of " << errMsg << " from tvmtool must be unixtime. Got: " << it->Value());
+
+        return TInstant::Seconds(time);
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdateServiceTickets(const TMetaInfo::TConfig& config,
+                                                        TInstant lastUpdate) const {
+        return config.AreTicketsRequired() &&
+               TInstant::Now() - lastUpdate > ServiceTicketsDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsTimeToUpdatePublicKeys(TInstant lastUpdate) const {
+        return TInstant::Now() - lastUpdate > PublicKeysDurations_.RefreshPeriod;
+    }
+
+    bool TThreadedUpdater::IsEverythingOk(const TMetaInfo::TConfig& config) const {
+        return AreServiceTicketsOk(config) && ArePublicKeysOk();
+    }
+
+    bool TThreadedUpdater::AreServiceTicketsOk(const TMetaInfo::TConfig& config) const {
+        return AreServiceTicketsOk(config.DstAliases.size());
+    }
+
+    bool TThreadedUpdater::AreServiceTicketsOk(size_t requiredCount) const {
+        if (requiredCount == 0) {
+            return true;
+        }
+
+        auto c = GetCachedServiceTickets();
+        return c && c->TicketsByAlias.size() == requiredCount;
+    }
+
+    bool TThreadedUpdater::ArePublicKeysOk() const {
+        return GetCachedServiceContext() && GetCachedUserContext();
+    }
+
+    bool TThreadedUpdater::IsConfigWarnTime() const {
+        return LastVisitForConfig_ + ConfigWarnDelay_ < TInstant::Now();
+    }
+
+    void TThreadedUpdater::Worker() {
+        UpdateState();
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/tool/threaded_updater.h b/library/cpp/tvmauth/client/misc/tool/threaded_updater.h
new file mode 100644
index 00000000000..7fe88adfae8
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/tool/threaded_updater.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include "meta_info.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+#include <library/cpp/tvmauth/client/misc/threaded_updater.h>
+
+#include <atomic>
+
+namespace NTvmAuth::NTvmTool {
+    class TThreadedUpdater: public TThreadedUpdaterBase {
+    public:
+        static TAsyncUpdaterPtr Create(const TClientSettings& settings, TLoggerPtr logger);
+        ~TThreadedUpdater();
+
+        TClientStatus GetStatus() const override;
+
+    protected: // for tests
+        TClientStatus::ECode GetState() const;
+
+        TThreadedUpdater(const TString& host, ui16 port, TDuration socketTimeout, TDuration connectTimeout, TLoggerPtr logger);
+
+        void Init(const TClientSettings& settings);
+        void UpdateState();
+
+        TInstant UpdateServiceTickets(const TMetaInfo::TConfig& config);
+        std::pair<TString, TInstant> FetchServiceTickets(const TMetaInfo::TConfig& config) const;
+        TPairTicketsErrors ParseFetchTicketsResponse(const TString& resp,
+                                                     const TMetaInfo::TDstAliases& dsts) const;
+
+        TInstant UpdateKeys(const TMetaInfo::TConfig& config);
+        std::pair<TString, TInstant> FetchPublicKeys() const;
+
+        static TInstant GetBirthTimeFromResponse(const THttpHeaders& headers, TStringBuf errMsg);
+
+        bool IsTimeToUpdateServiceTickets(const TMetaInfo::TConfig& config, TInstant lastUpdate) const;
+        bool IsTimeToUpdatePublicKeys(TInstant lastUpdate) const;
+
+        bool IsEverythingOk(const TMetaInfo::TConfig& config) const;
+        bool AreServiceTicketsOk(const TMetaInfo::TConfig& config) const;
+        bool AreServiceTicketsOk(size_t requiredCount) const;
+        bool ArePublicKeysOk() const;
+        bool IsConfigWarnTime() const;
+
+    private:
+        void Worker() override;
+
+    protected:
+        TMetaInfo MetaInfo_;
+        TInstant LastVisitForServiceTickets_;
+        TInstant LastVisitForPublicKeys_;
+        TInstant LastVisitForConfig_;
+        TDuration ConfigWarnDelay_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/misc/utils.cpp b/library/cpp/tvmauth/client/misc/utils.cpp
new file mode 100644
index 00000000000..a124c7b11cd
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/utils.cpp
@@ -0,0 +1,46 @@
+#include "utils.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+
+#include <util/stream/format.h>
+
+namespace NTvmAuth::NInternal {
+    void TClientCaningKnife::StartTvmClientStopping(TTvmClient* c) {
+        if (c && c->Updater_) {
+            c->Updater_->StartTvmClientStopping();
+        }
+    }
+
+    bool TClientCaningKnife::IsTvmClientStopped(TTvmClient* c) {
+        return c && c->Updater_ ? c->Updater_->IsTvmClientStopped() : true;
+    }
+}
+
+namespace NTvmAuth::NUtils {
+    TString ToHex(const TStringBuf s) {
+        TStringStream res;
+        res.Reserve(2 * s.size());
+
+        for (char c : s) {
+            res << Hex(c, HF_FULL);
+        }
+
+        return std::move(res.Str());
+    }
+
+    bool CheckBbEnvOverriding(EBlackboxEnv original, EBlackboxEnv override) noexcept {
+        switch (original) {
+            case EBlackboxEnv::Prod:
+            case EBlackboxEnv::ProdYateam:
+                return override == EBlackboxEnv::Prod || override == EBlackboxEnv::ProdYateam;
+            case EBlackboxEnv::Test:
+                return true;
+            case EBlackboxEnv::TestYateam:
+                return override == EBlackboxEnv::Test || override == EBlackboxEnv::TestYateam;
+            case EBlackboxEnv::Stress:
+                return override == EBlackboxEnv::Stress;
+        }
+
+        return false;
+    }
+}
diff --git a/library/cpp/tvmauth/client/misc/utils.h b/library/cpp/tvmauth/client/misc/utils.h
new file mode 100644
index 00000000000..1aa5e61bf1a
--- /dev/null
+++ b/library/cpp/tvmauth/client/misc/utils.h
@@ -0,0 +1,95 @@
+#pragma once
+
+#include "api/settings.h"
+#include "tool/settings.h"
+
+#include <util/string/cast.h>
+#include <util/system/spinlock.h>
+
+#include <optional>
+
+namespace NTvmAuth {
+    class TTvmClient;
+}
+
+namespace NTvmAuth::NInternal {
+    class TClientCaningKnife {
+    public:
+        static void StartTvmClientStopping(TTvmClient* c);
+        static bool IsTvmClientStopped(TTvmClient* c);
+    };
+}
+
+namespace NTvmAuth::NUtils {
+    TString ToHex(const TStringBuf s);
+
+    inline NTvmAuth::NTvmApi::TClientSettings::TDstMap ParseDstMap(TStringBuf dsts) {
+        NTvmAuth::NTvmApi::TClientSettings::TDstMap res;
+
+        while (dsts) {
+            TStringBuf pair = dsts.NextTok(';');
+            TStringBuf alias = pair.NextTok(':');
+            res.insert(decltype(res)::value_type(
+                alias,
+                IntFromString<TTvmId, 10>(pair)));
+        }
+
+        return res;
+    }
+
+    inline NTvmAuth::NTvmApi::TClientSettings::TDstVector ParseDstVector(TStringBuf dsts) {
+        NTvmAuth::NTvmApi::TClientSettings::TDstVector res;
+
+        while (dsts) {
+            res.push_back(IntFromString<TTvmId, 10>(dsts.NextTok(';')));
+        }
+
+        return res;
+    }
+
+    bool CheckBbEnvOverriding(EBlackboxEnv original, EBlackboxEnv override) noexcept;
+
+    template <class T>
+    class TProtectedValue {
+        class TAssignOp {
+        public:
+            static void Assign(T& l, const T& r) {
+                l = r;
+            }
+
+            template <typename U>
+            static void Assign(std::shared_ptr<U>& l, std::shared_ptr<U>& r) {
+                l.swap(r);
+            }
+
+            template <typename U>
+            static void Assign(TIntrusiveConstPtr<U>& l, TIntrusiveConstPtr<U>& r) {
+                l.Swap(r);
+            }
+        };
+
+    public:
+        TProtectedValue() = default;
+
+        TProtectedValue(T value)
+            : Value_(value)
+        {
+        }
+
+        T Get() const {
+            with_lock (Lock_) {
+                return Value_;
+            }
+        }
+
+        void Set(T o) {
+            with_lock (Lock_) {
+                TAssignOp::Assign(Value_, o);
+            }
+        }
+
+    private:
+        T Value_;
+        mutable TAdaptiveLock Lock_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/mocked_updater.cpp b/library/cpp/tvmauth/client/mocked_updater.cpp
new file mode 100644
index 00000000000..54f94bc92a2
--- /dev/null
+++ b/library/cpp/tvmauth/client/mocked_updater.cpp
@@ -0,0 +1,60 @@
+#include "mocked_updater.h"
+
+#include <library/cpp/tvmauth/unittest.h>
+
+namespace NTvmAuth {
+    TMockedUpdater::TSettings TMockedUpdater::TSettings::CreateDeafult() {
+        TMockedUpdater::TSettings res;
+
+        res.SelfTvmId = 100500;
+
+        res.Backends = {
+            {
+                /*.Alias_ = */ "my_dest",
+                /*.Id_ = */ 42,
+                /*.Value_ = */ "3:serv:CBAQ__________9_IgYIlJEGECo:O9-vbod_8czkKrpwJAZCI8UgOIhNr2xKPcS-LWALrVC224jga2nIT6vLiw6q3d6pAT60g9K7NB39LEmh7vMuePtUMjzuZuL-uJg17BsH2iTLCZSxDjWxbU9piA2T6u607jiSyiy-FI74pEPqkz7KKJ28aPsefuC1VUweGkYFzNY",
+            },
+        };
+
+        res.BadBackends = {
+            {
+                /*.Alias_ = */ "my_bad_dest",
+                /*.Id_ = */ 43,
+                /*.Value_ = */ "Dst is not found",
+            },
+        };
+
+        return res;
+    }
+
+    TMockedUpdater::TMockedUpdater(const TSettings& settings)
+        : Roles_(settings.Roles)
+    {
+        SetServiceContext(MakeIntrusiveConst<TServiceContext>(TServiceContext::CheckingFactory(
+            settings.SelfTvmId,
+            NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+
+        SetBbEnv(settings.UserTicketEnv);
+        SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+
+        TServiceTickets::TMapIdStr tickets, errors;
+        TServiceTickets::TMapAliasId aliases;
+
+        for (const TSettings::TTuple& t : settings.Backends) {
+            tickets[t.Id] = t.Value;
+            aliases[t.Alias] = t.Id;
+        }
+        for (const TSettings::TTuple& t : settings.BadBackends) {
+            errors[t.Id] = t.Value;
+            aliases[t.Alias] = t.Id;
+        }
+
+        SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            std::move(tickets),
+            std::move(errors),
+            std::move(aliases)));
+
+        SetUpdateTimeOfPublicKeys(TInstant::Now());
+        SetUpdateTimeOfServiceTickets(TInstant::Now());
+    }
+}
diff --git a/library/cpp/tvmauth/client/mocked_updater.h b/library/cpp/tvmauth/client/mocked_updater.h
new file mode 100644
index 00000000000..f8a6394f5fc
--- /dev/null
+++ b/library/cpp/tvmauth/client/mocked_updater.h
@@ -0,0 +1,43 @@
+#pragma once
+
+#include "misc/async_updater.h"
+
+namespace NTvmAuth {
+    class TMockedUpdater: public TAsyncUpdaterBase {
+    public:
+        struct TSettings {
+            struct TTuple {
+                TClientSettings::TAlias Alias;
+                TTvmId Id = 0;
+                TString Value; // ticket or error
+            };
+
+            TTvmId SelfTvmId = 0;
+            TVector<TTuple> Backends;
+            TVector<TTuple> BadBackends;
+            EBlackboxEnv UserTicketEnv = EBlackboxEnv::Test;
+            NRoles::TRolesPtr Roles;
+
+            static TSettings CreateDeafult();
+        };
+
+        TMockedUpdater(const TSettings& settings = TSettings::CreateDeafult());
+
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+
+        NRoles::TRolesPtr GetRoles() const override {
+            return Roles_;
+        }
+
+        using TAsyncUpdaterBase::SetServiceContext;
+        using TAsyncUpdaterBase::SetServiceTickets;
+        using TAsyncUpdaterBase::SetUpdateTimeOfPublicKeys;
+        using TAsyncUpdaterBase::SetUpdateTimeOfServiceTickets;
+        using TAsyncUpdaterBase::SetUserContext;
+
+    protected:
+        NRoles::TRolesPtr Roles_;
+    };
+}
diff --git a/library/cpp/tvmauth/client/ut/async_updater_ut.cpp b/library/cpp/tvmauth/client/ut/async_updater_ut.cpp
new file mode 100644
index 00000000000..1c1e8cbaae5
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/async_updater_ut.cpp
@@ -0,0 +1,165 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/misc/async_updater.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(AsyncUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:M9dEFEWHLHXiL7brCsyfYlm254PE6VeshUjI62u2qMDRzt6-0jAoJTIdDiogerItht1YFYSn8fSqmMf23_rueGj-wkmvyNzbcBSk3jtK2U5sai_W0bK6OwukR9tzWzi1Gcgg9DrNEeIKFvs1EBqYCF4mPHWo5bgk0CR580Cgit4";
+    static const TString TEST_YATEAM_TICKET = "3:user:CA4Q__________9_Gg4KAgh7EHsg0oXYzAQoAw:IlaV3htk3jYrviIOz3k3Dfwz7p-bYYpbrgdn53GiUrMGdrT9eobHeuzNvPLrWB0yuYZAD46C3MGxok4GGmHhT73mki4XOCX8yWT4jW_hzcHBik1442tjWwh8IWqV_7q5j5496suVuLWjnZORWbb7I-2iwdIlU1BUiDfhoAolCq8";
+    static const TString STRESS_TICKET = "3:user:CA8Q__________9_Gg4KAgh7EHsg0oXYzAQoBA:GBuG_TLo6SL2OYFxp7Zly04HPNzmAF7Fu2E8E9SnwQDoxq9rf7VThSPtTmnBSAl5UVRRPkMsRtzzHZ87qtj6l-PvF0K7PrDu7-yS_xiFTgAl9sEfXAIHJVzZLoksGRgpoBtpBUg9vVaJsPns0kWFKJgq8M-Mk9agrSk7sb2VUeQ";
+
+    class TTestUpdater: public TAsyncUpdaterBase {
+    public:
+        using TAsyncUpdaterBase::SetBbEnv;
+        using TAsyncUpdaterBase::SetUserContext;
+
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+    };
+
+    Y_UNIT_TEST(User) {
+        TTestUpdater u;
+
+        UNIT_ASSERT(!u.GetCachedUserContext());
+
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(!u.GetCachedUserContext());
+
+        UNIT_ASSERT_NO_EXCEPTION(u.SetBbEnv(EBlackboxEnv::Prod));
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT(u.GetCachedUserContext()->Check(PROD_TICKET));
+        UNIT_ASSERT_NO_EXCEPTION(u.GetCachedUserContext(EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(u.GetCachedUserContext(EBlackboxEnv::ProdYateam)->Check(PROD_YATEAM_TICKET));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.SetBbEnv(EBlackboxEnv::Prod, EBlackboxEnv::Test),
+                                       TBrokenTvmClientSettings,
+                                       "Overriding of BlackboxEnv is illegal: Prod -> Test");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.GetCachedUserContext(EBlackboxEnv::Test),
+                                       TBrokenTvmClientSettings,
+                                       "Overriding of BlackboxEnv is illegal: Prod -> Test");
+
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT(u.GetCachedUserContext()->Check(PROD_TICKET));
+    }
+
+    class DummyUpdater: public TAsyncUpdaterBase {
+    public:
+        TClientStatus GetStatus() const override {
+            return TClientStatus();
+        }
+
+        using TAsyncUpdaterBase::SetServiceContext;
+        using TAsyncUpdaterBase::SetServiceTickets;
+        using TAsyncUpdaterBase::SetUserContext;
+    };
+
+    Y_UNIT_TEST(Cache) {
+        DummyUpdater d;
+
+        UNIT_ASSERT(!d.GetCachedServiceTickets());
+        TServiceTicketsPtr st = MakeIntrusiveConst<TServiceTickets>(TServiceTickets::TMapIdStr(),
+                                                                    TServiceTickets::TMapIdStr(),
+                                                                    TServiceTickets::TMapAliasId());
+        d.SetServiceTickets(st);
+        UNIT_ASSERT_EQUAL(st.Get(), d.GetCachedServiceTickets().Get());
+
+        UNIT_ASSERT(!d.GetCachedServiceContext());
+        TServiceContextPtr sc = MakeIntrusiveConst<TServiceContext>(TServiceContext::SigningFactory("kjndfadfndsfafdasd"));
+        d.SetServiceContext(sc);
+        UNIT_ASSERT_EQUAL(sc.Get(), d.GetCachedServiceContext().Get());
+
+        UNIT_ASSERT(!d.GetCachedUserContext());
+        d.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_Aliases) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TUnfetchedId = TServiceTickets::TIdSet;
+        using TStr = TServiceTickets::TMapAliasStr;
+        using TUnfetchedAlias = TServiceTickets::TAliasSet;
+        using TAls = TServiceTickets::TMapAliasId;
+        TServiceTickets t(TId{}, TId{}, TAls{});
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, "t1"}, {2, "t2"}}),
+                                                     TId({{3, "e1"}}),
+                                                     TAls()));
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({{3, "e1"}}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TStr(), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr(), t.ErrorsByAlias);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, "t1"}, {2, "t2"}}),
+                                                     TId({{3, "e1"}}),
+                                                     TAls({{"1", 1}, {"2", 2}, {"3", 3}})));
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({{3, "e1"}}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TUnfetchedId(), t.UnfetchedIds);
+        UNIT_ASSERT_EQUAL(TStr({{"1", "t1"}, {"2", "t2"}}), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr({{"3", "e1"}}), t.ErrorsByAlias);
+        UNIT_ASSERT_EQUAL(TUnfetchedAlias({}), t.UnfetchedAliases);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_UnfetchedIds) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TUnfetchedId = TServiceTickets::TIdSet;
+        using TStr = TServiceTickets::TMapAliasStr;
+        using TUnfetchedAlias = TServiceTickets::TAliasSet;
+        using TAls = TServiceTickets::TMapAliasId;
+        TServiceTickets t(TId({{1, "t1"}, {2, "t2"}}),
+                          TId(),
+                          TAls({{"1", 1}, {"2", 2}, {"3", 3}}));
+
+        UNIT_ASSERT_EQUAL(TId({{1, "t1"}, {2, "t2"}}), t.TicketsById);
+        UNIT_ASSERT_EQUAL(TId({}), t.ErrorsById);
+        UNIT_ASSERT_EQUAL(TUnfetchedId({3}), t.UnfetchedIds);
+        UNIT_ASSERT_EQUAL(TUnfetchedAlias({{"3"}}), t.UnfetchedAliases);
+        UNIT_ASSERT_EQUAL(TStr({{"1", "t1"}, {"2", "t2"}}), t.TicketsByAlias);
+        UNIT_ASSERT_EQUAL(TStr(), t.ErrorsByAlias);
+    }
+
+    Y_UNIT_TEST(ServiceTickets_InvalidationTime) {
+        using TId = TServiceTickets::TMapIdStr;
+        using TAls = TServiceTickets::TMapAliasId;
+
+        TServiceTickets t(TId{}, TId{}, TAls{});
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({{1, SRV_TICKET}}),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {1, SRV_TICKET},
+                                                         {2, "serv"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {2, "serv"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), t.InvalidationTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(t = TServiceTickets(TId({
+                                                         {1, SRV_TICKET},
+                                                         {2, "serv"},
+                                                         {3, "3:serv:CBAQeyIECAMQAw:TiZjG2Ut9j-9n0zcqxGW8xiYmnFa-i10-dbA0FKIInKzeDuueovWVEBcgbQHndblzRCxoIBMgbotOf7ALk2xoSBnRbOKomAIEtiTBL77GByL5O8K_HUGNYb-ygqnmZlIuLalgeRQAdsKstgUwQzufnOQyekipmamwo7EVQhr8Ug"},
+                                                     }),
+                                                     TId(),
+                                                     TAls()));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(123), t.InvalidationTime);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/checker_ut.cpp b/library/cpp/tvmauth/client/ut/checker_ut.cpp
new file mode 100644
index 00000000000..54a25974c14
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/checker_ut.cpp
@@ -0,0 +1,176 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/checker.h>
+#include <library/cpp/tvmauth/client/misc/getter.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientChecker) {
+    static const TTvmId OK_CLIENT = 100500;
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:M9dEFEWHLHXiL7brCsyfYlm254PE6VeshUjI62u2qMDRzt6-0jAoJTIdDiogerItht1YFYSn8fSqmMf23_rueGj-wkmvyNzbcBSk3jtK2U5sai_W0bK6OwukR9tzWzi1Gcgg9DrNEeIKFvs1EBqYCF4mPHWo5bgk0CR580Cgit4";
+    static const TString TEST_YATEAM_TICKET = "3:user:CA4Q__________9_Gg4KAgh7EHsg0oXYzAQoAw:IlaV3htk3jYrviIOz3k3Dfwz7p-bYYpbrgdn53GiUrMGdrT9eobHeuzNvPLrWB0yuYZAD46C3MGxok4GGmHhT73mki4XOCX8yWT4jW_hzcHBik1442tjWwh8IWqV_7q5j5496suVuLWjnZORWbb7I-2iwdIlU1BUiDfhoAolCq8";
+    static const TString STRESS_TICKET = "3:user:CA8Q__________9_Gg4KAgh7EHsg0oXYzAQoBA:GBuG_TLo6SL2OYFxp7Zly04HPNzmAF7Fu2E8E9SnwQDoxq9rf7VThSPtTmnBSAl5UVRRPkMsRtzzHZ87qtj6l-PvF0K7PrDu7-yS_xiFTgAl9sEfXAIHJVzZLoksGRgpoBtpBUg9vVaJsPns0kWFKJgq8M-Mk9agrSk7sb2VUeQ";
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+
+    Y_UNIT_TEST(User) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(OK_CLIENT);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(GetCachePath());
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            UNIT_ASSERT_EXCEPTION(TUserTicketChecker(u), TBrokenTvmClientSettings);
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.EnableUserTicketChecking(EBlackboxEnv::Prod);
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TUserTicketChecker c(u);
+            UNIT_ASSERT(c.Check(PROD_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_TICKET, {}));
+            UNIT_ASSERT(!c.Check(PROD_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(STRESS_TICKET, {}));
+
+            UNIT_ASSERT(!c.Check(PROD_TICKET, EBlackboxEnv::ProdYateam));
+            UNIT_ASSERT(!c.Check(TEST_TICKET, EBlackboxEnv::ProdYateam));
+            UNIT_ASSERT(c.Check(PROD_YATEAM_TICKET, EBlackboxEnv::ProdYateam));
+            UNIT_ASSERT(!c.Check(TEST_YATEAM_TICKET, EBlackboxEnv::ProdYateam));
+            UNIT_ASSERT(!c.Check(STRESS_TICKET, EBlackboxEnv::ProdYateam));
+
+            UNIT_ASSERT_EXCEPTION(c.Check(PROD_TICKET, EBlackboxEnv::Stress), TBrokenTvmClientSettings);
+        }
+
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TUserTicketChecker c(u);
+            UNIT_ASSERT(!c.Check(PROD_TICKET, {}));
+            UNIT_ASSERT(c.Check(TEST_TICKET, {}));
+            UNIT_ASSERT(!c.Check(PROD_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(STRESS_TICKET, {}));
+        }
+
+        s.EnableUserTicketChecking(EBlackboxEnv::ProdYateam);
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TUserTicketChecker c(u);
+            UNIT_ASSERT(!c.Check(PROD_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_TICKET, {}));
+            UNIT_ASSERT(c.Check(PROD_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(STRESS_TICKET, {}));
+        }
+
+        s.EnableUserTicketChecking(EBlackboxEnv::TestYateam);
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TUserTicketChecker c(u);
+            UNIT_ASSERT(!c.Check(PROD_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_TICKET, {}));
+            UNIT_ASSERT(!c.Check(PROD_YATEAM_TICKET, {}));
+            UNIT_ASSERT(c.Check(TEST_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(STRESS_TICKET, {}));
+        }
+
+        s.EnableUserTicketChecking(EBlackboxEnv::Stress);
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TUserTicketChecker c(u);
+            UNIT_ASSERT(c.Check(PROD_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_TICKET, {}));
+            UNIT_ASSERT(!c.Check(PROD_YATEAM_TICKET, {}));
+            UNIT_ASSERT(!c.Check(TEST_YATEAM_TICKET, {}));
+            UNIT_ASSERT(c.Check(STRESS_TICKET, {}));
+        }
+    }
+
+    Y_UNIT_TEST(Service) {
+        NTvmApi::TClientSettings s;
+        s.EnableUserTicketChecking(EBlackboxEnv::Stress);
+        s.SetSelfTvmId(OK_CLIENT);
+        s.SetDiskCacheDir(GetCachePath());
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            UNIT_ASSERT_EXCEPTION(TServiceTicketChecker(u), TBrokenTvmClientSettings);
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.EnableServiceTicketChecking();
+        l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TServiceTicketChecker c(u);
+            UNIT_ASSERT(c.Check(SRV_TICKET));
+            UNIT_ASSERT(!c.Check(PROD_TICKET));
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+
+        s.SetSelfTvmId(17);
+        l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TServiceTicketChecker c(u);
+            UNIT_ASSERT(!c.Check(SRV_TICKET));
+            UNIT_ASSERT(!c.Check(PROD_TICKET));
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Tickets) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(OK_CLIENT);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(GetCachePath());
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus().GetCode());
+            TServiceTicketGetter g(u);
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", g.GetTicket("blackbox"));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(g.GetTicket("blackbox2"),
+                                           TBrokenTvmClientSettings,
+                                           "Destination 'blackbox2' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        }
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ErrorForDst) {
+        TServiceTicketGetter g(new TMockedUpdater);
+
+        UNIT_ASSERT_VALUES_EQUAL(TMockedUpdater::TSettings::CreateDeafult().Backends.at(0).Value,
+                                 g.GetTicket("my_dest"));
+        UNIT_ASSERT_VALUES_EQUAL(TMockedUpdater::TSettings::CreateDeafult().Backends.at(0).Value,
+                                 g.GetTicket(42));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(g.GetTicket("my_bad_dest"),
+                                       TMissingServiceTicket,
+                                       "Failed to get ticket for 'my_bad_dest': Dst is not found");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(g.GetTicket(43),
+                                       TMissingServiceTicket,
+                                       "Failed to get ticket for '43': Dst is not found");
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/client_status_ut.cpp b/library/cpp/tvmauth/client/ut/client_status_ut.cpp
new file mode 100644
index 00000000000..a1c3ae74cea
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/client_status_ut.cpp
@@ -0,0 +1,18 @@
+#include <library/cpp/tvmauth/client/client_status.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientStatus) {
+    Y_UNIT_TEST(Common) {
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, TClientStatus().GetCode());
+        UNIT_ASSERT_VALUES_EQUAL("", TClientStatus().GetLastError());
+
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, TClientStatus(TClientStatus::Warning, "kek"));
+        UNIT_ASSERT_VALUES_EQUAL("kek",
+                                 TClientStatus(TClientStatus::Warning, "kek").GetLastError());
+        UNIT_ASSERT_VALUES_EQUAL("2;TvmClient: kek\n",
+                                 TClientStatus(TClientStatus::Error, "kek").CreateJugglerMessage());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/common.h b/library/cpp/tvmauth/client/ut/common.h
new file mode 100644
index 00000000000..5dddc182b50
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/common.h
@@ -0,0 +1,232 @@
+#pragma once
+
+#include <library/cpp/tvmauth/client/logger.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/roles/entities_index.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/cgiparam/cgiparam.h>
+#include <library/cpp/testing/mock_server/server.h>
+#include <library/cpp/testing/unittest/env.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/str.h>
+#include <util/system/fs.h>
+
+class TLogger: public NTvmAuth::ILogger {
+public:
+    void Log(int lvl, const TString& msg) override {
+        Cout << TInstant::Now() << " lvl=" << lvl << " msg: " << msg << "\n";
+        Stream << lvl << ": " << msg << Endl;
+    }
+
+    TStringStream Stream;
+};
+
+static inline TString GetFilePath(const char* name) {
+    return ArcadiaSourceRoot() + "/library/cpp/tvmauth/client/ut/files/" + name;
+}
+
+static inline TString GetCachePath(const TString& dir = {}) {
+    if (dir) {
+        Y_ENSURE(NFs::MakeDirectoryRecursive("./" + dir));
+    }
+
+    auto wr = [](const TString& p, const TStringBuf body) {
+        NTvmAuth::TDiskWriter w(p);
+        Y_ENSURE(w.Write(body, TInstant::ParseIso8601("2050-01-01T00:00:00.000000Z")));
+    };
+    wr("./" + dir + "/public_keys", NTvmAuth::NUnittest::TVMKNIFE_PUBLIC_KEYS);
+    wr("./" + dir + "/service_tickets",
+       R"({
+   "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+   "213" : { "ticket" : "service_ticket_2"},
+   "234" : { "error" : "Dst is not found" },
+   "185" : { "ticket" : "service_ticket_3"}
+}	100500)");
+
+    return "./" + dir;
+}
+
+static const TString AUTH_TOKEN = "strong_token";
+static const TString META = R"(
+{
+"bb_env" : "ProdYaTeam",
+"tenants" : [
+    {
+        "self": {
+            "alias" : "me",
+            "client_id": 100500
+        },
+        "dsts" : [
+            {
+                "alias" : "bbox",
+                "client_id": 242
+            },
+            {
+                "alias" : "pass_likers",
+                "client_id": 11
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "push-client",
+            "client_id": 100501
+        },
+        "dsts" : [
+            {
+                "alias" : "pass_likers",
+                "client_id": 100502
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "multi_names_for_dst",
+            "client_id": 100599
+        },
+        "dsts" : [
+            {
+                "alias" : "pass_likers",
+                "client_id": 100502
+            },
+            {
+                "alias" : "pass_haters",
+                "client_id": 100502
+            }
+        ]
+    },
+    {
+        "self": {
+            "alias" : "something_else",
+            "client_id": 100503
+        },
+        "dsts" : [
+        ]
+    }
+]
+})";
+
+static const TString TICKETS_ME =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8",
+            "tvm_id": 11
+        },
+        "bbox": {
+            "ticket": "3:serv:CBAQ__________9_IgcIlJEGEPIB:N7luw0_rVmBosTTI130jwDbQd0-cMmqJeEl0ma4ZlIo_mHXjBzpOuMQ3A9YagbmOBOt8TZ_gzGvVSegWZkEeB24gM22acw0w-RcHaQKrzSOA5Zq8WLNIC8QUa4_WGTlAsb7R7eC4KTAGgouIquNAgMBdTuGOuZHnMLvZyLnOMKc",
+            "tvm_id": 242
+        }
+    })";
+
+static const TString SERVICE_TICKET_PC = "3:serv:CBAQ__________9_IggIlpEGEJaRBg:BAxaQJCdK4eFuJ6i_egqPwvJgWtlh0enDQRPr84Nx2phZ_8QtxKAUCwEa7KOU_jVvIBQIC5-ETTl2vjBt7UyygF8frdK4ab6zJoWj4n07np6vbmWd385l8KvzztLt4QkBrPiE7U46dK3pL0U8tfBkSXE8rvUIsl3RvvgSNH2J3c";
+static const TString TICKETS_PC =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IggIlpEGEJaRBg:BAxaQJCdK4eFuJ6i_egqPwvJgWtlh0enDQRPr84Nx2phZ_8QtxKAUCwEa7KOU_jVvIBQIC5-ETTl2vjBt7UyygF8frdK4ab6zJoWj4n07np6vbmWd385l8KvzztLt4QkBrPiE7U46dK3pL0U8tfBkSXE8rvUIsl3RvvgSNH2J3c",
+            "tvm_id": 100502
+        }
+    })";
+
+static const TString TICKETS_MANY_DSTS =
+    R"({
+        "pass_likers": {
+            "ticket": "3:serv:CBAQ__________9_IggI95EGEJaRBg:D0MOLDhKQyI-OhC0ON9gYukz2hOctUipu1yXsvkw6NRuLhcBfvGayyUqF4ILrqepjz9GtPWIR_wO6oLSW35Z0YaFn60QWp5tG6IcAnr80lm_OnLHJt4kmEoLtGg1V0aWBT0YyouzGB2-QFNOVO86G7sYzU8FC6-V3Iyc4X7XTNc",
+            "tvm_id": 100502
+        },
+        "who_are_you??": {
+            "ticket": "kek",
+            "tvm_id": 100503
+        },
+        "pass_haters": {
+            "ticket": "3:serv:CBAQ__________9_IggI95EGEJaRBg:D0MOLDhKQyI-OhC0ON9gYukz2hOctUipu1yXsvkw6NRuLhcBfvGayyUqF4ILrqepjz9GtPWIR_wO6oLSW35Z0YaFn60QWp5tG6IcAnr80lm_OnLHJt4kmEoLtGg1V0aWBT0YyouzGB2-QFNOVO86G7sYzU8FC6-V3Iyc4X7XTNc",
+            "tvm_id": 100502
+        }
+    })";
+
+static const TString TICKETS_SE = R"({})";
+
+static const TInstant BIRTHTIME = TInstant::Seconds(14380887840);
+class TTvmTool: public TRequestReplier {
+public:
+    TString Meta;
+    HttpCodes Code;
+    TInstant Birthtime;
+
+    TTvmTool()
+        : Meta(META)
+        , Code(HTTP_OK)
+        , Birthtime(BIRTHTIME)
+    {
+    }
+
+    bool DoReply(const TReplyParams& params) override {
+        const TParsedHttpFull http(params.Input.FirstLine());
+        if (http.Path == "/tvm/ping") {
+            THttpResponse resp(HTTP_OK);
+            resp.SetContent("OK");
+            resp.OutTo(params.Output);
+            return true;
+        }
+
+        auto it = std::find_if(params.Input.Headers().begin(),
+                               params.Input.Headers().end(),
+                               [](const THttpInputHeader& h) { return h.Name() == "Authorization"; });
+        if (it == params.Input.Headers().end() || it->Value() != AUTH_TOKEN) {
+            THttpResponse resp(HTTP_UNAUTHORIZED);
+            resp.SetContent("pong");
+            resp.OutTo(params.Output);
+            return true;
+        }
+
+        THttpResponse resp(Code);
+        if (http.Path == "/tvm/keys") {
+            resp.SetContent(NTvmAuth::NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        } else if (http.Path == "/tvm/tickets") {
+            TCgiParameters cg;
+            cg.ScanAddAll(http.Cgi);
+            if (cg.Get("src") == "100500") {
+                resp.SetContent(TICKETS_ME);
+            } else if (cg.Get("src") == "100501") {
+                resp.SetContent(TICKETS_PC);
+            } else if (cg.Get("src") == "100599") {
+                resp.SetContent(TICKETS_MANY_DSTS);
+            }
+        } else if (http.Path == "/tvm/private_api/__meta__") {
+            resp.SetContent(Meta);
+        }
+        resp.AddHeader("X-Ya-Tvmtool-Data-Birthtime", IntToString<10>(Birthtime.Seconds()));
+        resp.OutTo(params.Output);
+
+        return true;
+    }
+};
+
+static inline NTvmAuth::NRoles::TEntitiesIndex CreateEntitiesIndex() {
+    using namespace NTvmAuth::NRoles;
+
+    TEntitiesIndex index(
+        {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#22"},
+                {"key#3", "value#33"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#23"},
+                {"key#3", "value#33"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#13"},
+                {"key#3", "value#33"},
+            }),
+        });
+
+    return index;
+}
diff --git a/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp b/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp
new file mode 100644
index 00000000000..a92530cab17
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/default_uid_checker_ut.cpp
@@ -0,0 +1,52 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/default_uid_checker.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(DefaultUidChecker) {
+    Y_UNIT_TEST(Ctor) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDefaultUidChecker(new TMockedUpdater),
+            TBrokenTvmClientSettings,
+            "Need to use TClientSettings::EnableRolesFetching");
+    }
+
+    Y_UNIT_TEST(Check) {
+        NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+            NRoles::TRoles::TMeta{},
+            NRoles::TRoles::TTvmConsumers{},
+            NRoles::TRoles::TUserConsumers{
+                {12345, std::make_shared<NRoles::TConsumerRoles>(
+                            THashMap<TString, NRoles::TEntitiesPtr>())},
+            },
+            std::make_shared<TString>());
+        const TDefaultUidChecker checker(new TMockedUpdater({.Roles = roles}));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            checker.Check(NUnittest::CreateUserTicket(ETicketStatus::Expired, 12345, {})),
+            TIllegalUsage,
+            "User ticket must be valid");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            checker.Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 12345, {}, {}, EBlackboxEnv::Test)),
+            TIllegalUsage,
+            "User ticket must be from ProdYateam, got from Test");
+
+        TCheckedUserTicket ticket;
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = checker.Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 12345, {}, {}, EBlackboxEnv::ProdYateam)));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, ticket.GetStatus());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = checker.Check(NUnittest::CreateUserTicket(ETicketStatus::Ok, 9999, {}, {}, EBlackboxEnv::ProdYateam)));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles, ticket.GetStatus());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp b/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp
new file mode 100644
index 00000000000..7dd851c9b30
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/disk_cache_ut.cpp
@@ -0,0 +1,204 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+#include <util/system/sysstat.h>
+
+#include <thread>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientDisk) {
+    Y_UNIT_TEST(Hash) {
+        TString hash = TDiskReader::GetHash("asd");
+        UNIT_ASSERT(hash);
+        UNIT_ASSERT_VALUES_EQUAL(32, hash.size());
+        UNIT_ASSERT_VALUES_EQUAL("Zj5_qYg31bPlqjBW76z8IV0rCsHmv-iN-McV6ybS1-g", NUtils::Bin2base64url(hash));
+    }
+
+    Y_UNIT_TEST(Timestamp) {
+        time_t t = 100500;
+
+        TString s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL("lIgBAAAAAAA", NUtils::Bin2base64url(s));
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+
+        t = 123123123213089;
+        s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL("IdMF1vpvAAA", NUtils::Bin2base64url(s));
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+
+        t = time(nullptr);
+        s = TDiskWriter::WriteTimestamp(t);
+        UNIT_ASSERT_VALUES_EQUAL(t, TDiskReader::GetTimestamp(s));
+    }
+
+    const TInstant TIME = TInstant::Seconds(100500);
+    const TString DATA = "oiweuhn \n vw3ut hweoi uhgewproritjhwequtherwoiughfdsv 8ty34q01u   34  1=3";
+
+    Y_UNIT_TEST(ParseData_Ok) {
+        TLogger l;
+
+        const TInstant time = TInstant::Seconds(1523446554789);
+
+        TString toFile = TDiskWriter::PrepareData(time, DATA);
+        UNIT_ASSERT_VALUES_EQUAL(113, toFile.size());
+        UNIT_ASSERT_VALUES_EQUAL("T8BnRIMoC6mlMXexPg9cV5jYxeFtgDWk97JTajHDunCloH20YgEAAG9pd2V1aG4gCiB2dzN1dCBod2VvaSB1aGdld3Byb3JpdGpod2VxdXRoZXJ3b2l1Z2hmZHN2IDh0eTM0cTAxdSAgIDM0ICAxPTM",
+                                 NUtils::Bin2base64url(toFile));
+
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(r.ParseData(toFile));
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT_VALUES_EQUAL(time, r.Time());
+        UNIT_ASSERT_VALUES_EQUAL("6: File 'qwerty' was successfully read\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseData_SmallFile) {
+        TLogger l;
+
+        TString toFile = TDiskWriter::PrepareData(TIME, DATA);
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(!r.ParseData(toFile.substr(0, 17)));
+        UNIT_ASSERT_VALUES_EQUAL("4: File 'qwerty' is too small\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseData_Changed) {
+        TLogger l;
+
+        TString toFile = TDiskWriter::PrepareData(TIME, DATA);
+        toFile[17] = toFile[17] + 1;
+        TDiskReader r("qwerty", &l);
+        UNIT_ASSERT(!r.ParseData(toFile));
+        UNIT_ASSERT_VALUES_EQUAL("4: Content of 'qwerty' was incorrectly changed\n",
+                                 l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Read_Ok) {
+        TLogger l;
+
+        TDiskReader r(GetFilePath("ok.cache"), &l);
+        UNIT_ASSERT(r.Read());
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT_VALUES_EQUAL(TIME, r.Time());
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully read") != TString::npos, l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Read_NoFile) {
+        TLogger l;
+
+        TDiskReader r("missing", &l);
+        UNIT_ASSERT(!r.Read());
+        UNIT_ASSERT_VALUES_EQUAL("7: File 'missing' does not exist\n",
+                                 l.Stream.Str());
+    }
+
+#ifdef _unix_
+    Y_UNIT_TEST(Read_NoPermitions) {
+        TLogger l;
+
+        const TString path = GetWorkPath() + "/123";
+        {
+            TFileOutput output(path);
+        }
+        Chmod(path.data(), S_IWUSR);
+
+        TDiskReader r(path, &l);
+        UNIT_ASSERT(!r.Read());
+        UNIT_ASSERT_C(l.Stream.Str().find("Permission denied") != TString::npos, l.Stream.Str());
+
+        Chmod(path.data(), S_IRWXU);
+        NFs::Remove(path);
+    }
+#endif
+
+    Y_UNIT_TEST(Write_Ok) {
+        TLogger l;
+
+        const TString path = "./tmp_file";
+        TDiskWriter w(path, &l);
+        UNIT_ASSERT_C(w.Write(DATA), l.Stream.Str());
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully written") != TString::npos, l.Stream.Str());
+        l.Stream.Clear();
+
+        TDiskReader r(path, &l);
+        UNIT_ASSERT_C(r.Read(), l.Stream.Str());
+        UNIT_ASSERT_VALUES_EQUAL(DATA, r.Data());
+        UNIT_ASSERT(TInstant::Now() - r.Time() < TDuration::Minutes(5));
+        UNIT_ASSERT_C(l.Stream.Str().find("was successfully read") != TString::npos, l.Stream.Str());
+
+        NFs::Remove(path);
+    }
+
+    Y_UNIT_TEST(Write_NoPermitions) {
+        TLogger l;
+
+        TDiskWriter w("/some_file", &l);
+        UNIT_ASSERT(!w.Write(DATA));
+        UNIT_ASSERT_C(l.Stream.Str().Contains("3: Failed to write '/some_file': ("), l.Stream.Str());
+        UNIT_ASSERT_C(l.Stream.Str().Contains("denied"), l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(race) {
+        const TString path = "./tmp_file";
+        const TString data = "ejufhsadkjfvbhsaoicnaofssdahfasdfhasdofdsaf";
+        NFs::Remove(path);
+
+        std::atomic<bool> fail = false;
+        std::vector<std::thread> thrs;
+        for (size_t idx = 0; idx < 16; ++idx) {
+            thrs.push_back(std::thread([&fail, data, path]() {
+                TDiskWriter w(path);
+                for (size_t k = 0; k < 1000; ++k) {
+                    if (!w.Write(data)) {
+                        fail = true;
+                    }
+                }
+            }));
+        }
+        for (std::thread& t : thrs) {
+            t.join();
+        }
+        thrs.clear();
+        UNIT_ASSERT(fail);
+        {
+            TDiskWriter w(path);
+            UNIT_ASSERT(w.Write(data)); // checks unlocked flock
+        }
+
+        fail = false;
+
+        for (size_t idx = 0; idx < 4; ++idx) {
+            thrs.push_back(std::thread([&fail, data, path]() {
+                TLogger l;
+                TDiskReader r(path, &l);
+                for (size_t k = 0; k < 100; ++k) {
+                    if (!r.Read()) {
+                        Cerr << l.Stream.Str() << Flush;
+                        fail = true;
+                        return;
+                    }
+                    if (r.Data() != data) {
+                        Cerr << (TStringBuilder() << "'" << data << "' vs '" << r.Data() << "'" << Endl) << Flush;
+                        fail = true;
+                        return;
+                    }
+                }
+            }));
+        }
+        for (std::thread& t : thrs) {
+            t.join();
+        }
+        thrs.clear();
+        UNIT_ASSERT(!fail);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp b/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp
new file mode 100644
index 00000000000..3dcbe6ad495
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/exponential_backoff_ut.cpp
@@ -0,0 +1,44 @@
+#include <library/cpp/tvmauth/client/misc/exponential_backoff.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <thread>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(PasspUtilsExpBackoff) {
+    Y_UNIT_TEST(common) {
+        TExponentialBackoff b({TDuration::Seconds(1), TDuration::Seconds(60), 2, 0.01});
+
+        UNIT_ASSERT_VALUES_EQUAL(TDuration::Seconds(1), b.GetCurrentValue());
+
+        TDuration dur = b.GetCurrentValue();
+        for (size_t idx = 0; idx < 6; ++idx) {
+            TDuration newValue = b.Increase();
+            UNIT_ASSERT_LT(dur, newValue);
+            dur = newValue;
+        }
+
+        UNIT_ASSERT_LT(TDuration::Seconds(60) - TDuration::Seconds(3), dur);
+        UNIT_ASSERT_LT(dur, TDuration::Seconds(60) + TDuration::Seconds(3));
+    }
+
+    Y_UNIT_TEST(sleep) {
+        TExponentialBackoff b({TDuration::Seconds(60), TDuration::Seconds(600), 2, 0.01});
+
+        const TInstant start = TInstant::Now();
+
+        TAutoEvent started;
+        std::thread t([&b, &started]() {
+            started.Signal();
+            b.Sleep();
+        });
+
+        started.WaitT(TDuration::Seconds(30));
+        b.Interrupt();
+        t.join();
+        TDuration dur = TInstant::Now() - start;
+
+        UNIT_ASSERT_LT(dur, TDuration::Seconds(60));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/facade_ut.cpp b/library/cpp/tvmauth/client/ut/facade_ut.cpp
new file mode 100644
index 00000000000..62e8e6c731a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/facade_ut.cpp
@@ -0,0 +1,167 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/generic/vector.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientFacade) {
+    static const TTvmId OK_CLIENT = 100500;
+    static const TString SRV_TICKET_123 = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString SRV_TICKET_456 = "3:serv:CBAQ__________9_IgcIyAMQlJEG:VrnqRhpoiDnJeAQbySJluJ1moQ5Kemic99iWzOrHLGfuh7iTw_xMT7KewRAmZMUwDKzE6otj7V86Xsnxbv5xZl8746wbvNcyUXu-nGWmbByZjO7xpSIcY07sISqEhP9n9C_yMSvqDP7ho_PRIfpGCDMXxKlFZ_BhBLLp0kHEvw4";
+    static const TString PROD_TICKET = "3:user:CAsQ__________9_Gg4KAgh7EHsg0oXYzAQoAA:N8PvrDNLh-5JywinxJntLeQGDEHBUxfzjuvB8-_BEUv1x9CALU7do8irDlDYVeVVDr4AIpR087YPZVzWPAqmnBuRJS0tJXekmDDvrivLnbRrzY4IUXZ_fImB0fJhTyVetKv6RD11bGqnAJeDpIukBwPTbJc_EMvKDt8V490CJFw";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+
+    TTvmClient GetClient(const NTvmApi::TClientSettings& s) {
+        auto l = MakeIntrusive<TLogger>();
+        TTvmClient f(s, l);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, f.GetStatus());
+        Sleep(TDuration::MilliSeconds(300));
+        TString logs = l->Stream.Str();
+        UNIT_ASSERT_C(logs.find("was successfully read") != TString::npos, logs);
+        UNIT_ASSERT_C(logs.find("was successfully fetched") == TString::npos, logs);
+        return f;
+    }
+
+    Y_UNIT_TEST(Service) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(OK_CLIENT);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(GetCachePath());
+        TTvmClient f = GetClient(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(2524608000), f.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(2525126400), f.GetInvalidationTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetInvalidationTimeOfServiceTickets());
+
+        UNIT_ASSERT(f.CheckServiceTicket(SRV_TICKET_123));
+        UNIT_ASSERT_EXCEPTION(f.CheckUserTicket(PROD_TICKET), yexception);
+        UNIT_ASSERT_EXCEPTION(f.CheckUserTicket(TEST_TICKET), yexception);
+    }
+
+    Y_UNIT_TEST(User) {
+        NTvmApi::TClientSettings s;
+        s.EnableUserTicketChecking(EBlackboxEnv::Prod);
+        s.SetDiskCacheDir(GetCachePath());
+
+        TTvmClient f = GetClient(s);
+        UNIT_ASSERT_EXCEPTION(f.CheckServiceTicket(SRV_TICKET_123), yexception);
+        UNIT_ASSERT(f.CheckUserTicket(PROD_TICKET));
+        UNIT_ASSERT(!f.CheckUserTicket(TEST_TICKET));
+    }
+
+    Y_UNIT_TEST(Ctors) {
+        NTvmApi::TClientSettings s;
+        s.EnableUserTicketChecking(EBlackboxEnv::Prod);
+        s.SetDiskCacheDir(GetCachePath());
+
+        TTvmClient f = GetClient(s);
+        f = GetClient(s);
+
+        TVector<TTvmClient> v;
+        v.push_back(std::move(f));
+        v.front() = std::move(*v.begin());
+    }
+
+    Y_UNIT_TEST(Tickets) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(OK_CLIENT);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(GetCachePath());
+        TTvmClient f = GetClient(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::ParseIso8601("2050-01-01T00:00:00.000000Z"), f.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), f.GetInvalidationTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<size_t>::max()), f.GetInvalidationTimeOfServiceTickets());
+
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", f.GetServiceTicketFor("blackbox"));
+        UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIKhCUkQY:CX", f.GetServiceTicketFor(19));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor("blackbox2"),
+                                       TBrokenTvmClientSettings,
+                                       "Destination 'blackbox2' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor(20),
+                                       TBrokenTvmClientSettings,
+                                       "Destination '20' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+    }
+
+    Y_UNIT_TEST(Tool) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("push-client");
+        s.SetPort(port);
+        s.SetAuthToken(AUTH_TOKEN);
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TTvmClient f(s, l);
+
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14380887840), f.GetUpdateTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14380887840), f.GetUpdateTimeOfServiceTickets());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(14381406240), f.GetInvalidationTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(std::numeric_limits<time_t>::max()), f.GetInvalidationTimeOfServiceTickets());
+
+            UNIT_ASSERT_VALUES_EQUAL(SERVICE_TICKET_PC, f.GetServiceTicketFor("pass_likers"));
+            UNIT_ASSERT_VALUES_EQUAL(SERVICE_TICKET_PC, f.GetServiceTicketFor(100502));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor("blackbox"),
+                                           TBrokenTvmClientSettings,
+                                           "Destination 'blackbox' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(f.GetServiceTicketFor(242),
+                                           TBrokenTvmClientSettings,
+                                           "Destination '242' was not specified in settings. Check your settings (if you use Qloud/YP/tvmtool - check it's settings)");
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100501, bb_env=ProdYateam, dsts=[(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(CheckRoles) {
+        { // roles not configured
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = OK_CLIENT,
+            }));
+
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed,
+                                     f.CheckServiceTicket("asdfg").GetStatus());
+        }
+
+        { // roles configured
+            NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+                NRoles::TRoles::TMeta{},
+                NRoles::TRoles::TTvmConsumers{
+                    {123, std::make_shared<NRoles::TConsumerRoles>(
+                              THashMap<TString, NRoles::TEntitiesPtr>())},
+                },
+                NRoles::TRoles::TUserConsumers{},
+                std::make_shared<TString>());
+            TTvmClient f(new TMockedUpdater(TMockedUpdater::TSettings{
+                .SelfTvmId = OK_CLIENT,
+                .Roles = roles,
+            }));
+
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok,
+                                     f.CheckServiceTicket(SRV_TICKET_123).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles,
+                                     f.CheckServiceTicket(SRV_TICKET_456).GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Malformed,
+                                     f.CheckServiceTicket("asdfg").GetStatus());
+        }
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/files/ok.cache b/library/cpp/tvmauth/client/ut/files/ok.cache
new file mode 100644
index 00000000000..768d4953d15
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/ok.cache
diff --git a/library/cpp/tvmauth/client/ut/files/public_keys b/library/cpp/tvmauth/client/ut/files/public_keys
new file mode 100644
index 00000000000..fa683d18f3b
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/public_keys
diff --git a/library/cpp/tvmauth/client/ut/files/roles b/library/cpp/tvmauth/client/ut/files/roles
new file mode 100644
index 00000000000..36864ae50a5
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/roles
diff --git a/library/cpp/tvmauth/client/ut/files/service_tickets b/library/cpp/tvmauth/client/ut/files/service_tickets
new file mode 100644
index 00000000000..7a6985a34d8
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/files/service_tickets
diff --git a/library/cpp/tvmauth/client/ut/last_error_ut.cpp b/library/cpp/tvmauth/client/ut/last_error_ut.cpp
new file mode 100644
index 00000000000..6751e78be7a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/last_error_ut.cpp
@@ -0,0 +1,56 @@
+#include <library/cpp/tvmauth/client/misc/last_error.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(LastError) {
+    Y_UNIT_TEST(common) {
+        TLastError le;
+
+        UNIT_ASSERT_VALUES_EQUAL("OK",
+                                 le.GetLastError(true));
+        UNIT_ASSERT_VALUES_EQUAL("Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru",
+                                 le.GetLastError(false));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(le.ThrowLastError(),
+                                       TNonRetriableException,
+                                       "Internal client error: failed to collect last useful error message");
+
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#1");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_re#1",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#2");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_re#2",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::PublicKeys, "err_nonre#3");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#3",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::PublicKeys, "err_nonre#4");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::PublicKeys, "err_re#5");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(le.ThrowLastError(),
+                                       TNonRetriableException,
+                                       "Failed to start TvmClient. Do not retry: PublicKeys: err_nonre#4");
+
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::ServiceTickets, "err_re#6");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::Retriable, TLastError::EScope::ServiceTickets, "err_re#7");
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ProcessError(TLastError::EType::NonRetriable, TLastError::EScope::ServiceTickets, "err_nonre#8");
+        UNIT_ASSERT_VALUES_EQUAL("ServiceTickets: err_nonre#8",
+                                 le.GetLastError(false));
+
+        le.ClearError(TLastError::EScope::ServiceTickets);
+        UNIT_ASSERT_VALUES_EQUAL("PublicKeys: err_nonre#4",
+                                 le.GetLastError(false));
+        le.ClearError(TLastError::EScope::PublicKeys);
+        UNIT_ASSERT_VALUES_EQUAL("Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru",
+                                 le.GetLastError(false));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/logger_ut.cpp b/library/cpp/tvmauth/client/ut/logger_ut.cpp
new file mode 100644
index 00000000000..76236e8913b
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/logger_ut.cpp
@@ -0,0 +1,43 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/logger.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientLogger) {
+    int i = 0;
+
+    Y_UNIT_TEST(Debug) {
+        TLogger l;
+        l.Debug("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("7: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Info) {
+        TLogger l;
+        l.Info("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("6: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Warning) {
+        TLogger l;
+        l.Warning("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("4: qwerty\n", l.Stream.Str());
+    }
+
+    Y_UNIT_TEST(Error) {
+        TLogger l;
+        l.Error("qwerty");
+        UNIT_ASSERT_VALUES_EQUAL("3: qwerty\n", l.Stream.Str());
+    }
+
+#ifdef _unix_
+    Y_UNIT_TEST(Cerr_) {
+        TCerrLogger l(5);
+        l.Error("hit");
+        l.Debug("miss");
+    }
+#endif
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp b/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp
new file mode 100644
index 00000000000..0ee5fc7cb7c
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/decoder_ut.cpp
@@ -0,0 +1,163 @@
+#include <library/cpp/tvmauth/client/exception.h>
+#include <library/cpp/tvmauth/client/misc/roles/decoder.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+#include <library/cpp/tvmauth/src/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Decoder) {
+    const TString BROTLI = NUtils::Base64url2bin("GyMAAAR0Y6ku58ObclAQzDweUSUwbdqc5yOOKgI");
+    const TString GZIP = NUtils::Base64url2bin("H4sIAAAAAAAA_yrOz01VKEstqkTGCpm5BflFJYl5JQpJOflJgAAAAP__MbeeiSQAAAA");
+    const TString ZSTD = NUtils::Base64url2bin("KLUv_QBY9AAAwHNvbWUgdmVyeSBpbXBvcnRhbnQgYmxvYgEAc-4IAQAA");
+
+    Y_UNIT_TEST(Decode) {
+        // Errs
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::Decode(
+                "1:brotli:10000:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(BROTLI)),
+            yexception,
+            "Decoded blob has bad size: expected 10000, actual 36");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::Decode(
+                "1:brotli:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF0000",
+                TString(BROTLI)),
+            yexception,
+            "Decoded blob has bad sha256");
+
+        // OK
+        TString decoded;
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode("", "some veryveryveryvery important blob"));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:brotli:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(BROTLI)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:gzip:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(GZIP)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            decoded = TDecoder::Decode(
+                "1:zstd:36:88839244E8C7C426B20729AF1A13AD792C5FA83C7F2FB6ADCFC60DA1B5EF9603",
+                TString(ZSTD)));
+        UNIT_ASSERT_VALUES_EQUAL(decoded, "some veryveryveryvery important blob");
+    }
+
+    Y_UNIT_TEST(UnknownCodecs) {
+        for (const TStringBuf codec : {"lz", "lzma", "kek"}) {
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                TDecoder::DecodeImpl(codec, ""),
+                yexception,
+                TStringBuilder() << "unknown codec: '" << codec << "'");
+        }
+    }
+
+    Y_UNIT_TEST(ParseCodec) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("2:kek"),
+            yexception,
+            "unknown codec format version; known: 1; got: 2");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:::"),
+            yexception,
+            "codec type is empty");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:some_codec:asd:"),
+            yexception,
+            "decoded blob size is not number");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::ParseCodec("1:some_codec:789:qwe"),
+            yexception,
+            "sha256 of decoded blob has invalid length: expected 64, got 3");
+
+        TDecoder::TCodecInfo info;
+        UNIT_ASSERT_NO_EXCEPTION(
+            info = TDecoder::ParseCodec("1:some_codec:789:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
+
+        UNIT_ASSERT_VALUES_EQUAL("some_codec", info.Type);
+        UNIT_ASSERT_VALUES_EQUAL(789, info.Size);
+        UNIT_ASSERT_VALUES_EQUAL("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+                                 info.Sha256);
+    }
+
+    Y_UNIT_TEST(DecodeBrolti) {
+        UNIT_ASSERT_EXCEPTION(
+            TDecoder::DecodeBrolti(""),
+            yexception);
+
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeBrolti(
+                TString(BROTLI)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(DecodeGzip) {
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(blob = TDecoder::DecodeGzip(""));
+        UNIT_ASSERT_VALUES_EQUAL("", blob);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeGzip(
+                TString(GZIP)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(DecodeZstd) {
+        TString blob;
+        UNIT_ASSERT_NO_EXCEPTION(blob = TDecoder::DecodeZstd(""));
+        UNIT_ASSERT_VALUES_EQUAL("", blob);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            blob = TDecoder::DecodeZstd(
+                TString(ZSTD)));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "some veryveryveryvery important blob",
+            blob);
+    }
+
+    Y_UNIT_TEST(VerifySize) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::VerifySize("qwerty", 100),
+            yexception,
+            TStringBuilder() << "Decoded blob has bad size: expected 100, actual 6");
+
+        UNIT_ASSERT_NO_EXCEPTION(TDecoder::VerifySize("qwert", 5));
+    }
+
+    Y_UNIT_TEST(VerifyChecksum) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TDecoder::VerifyChecksum("qwerty", "zzzz"),
+            yexception,
+            "Decoded blob has bad sha256: expected=zzzz,"
+            " actual=65E84BE33532FB784C48129675F9EFF3A682B27168C0EA744B2CF58EE02337C5");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            TDecoder::VerifyChecksum("qwerty",
+                                     "65E84BE33532FB784C48129675F9EFF3A682B27168C0EA744B2CF58EE02337C5"));
+        UNIT_ASSERT_NO_EXCEPTION(
+            TDecoder::VerifyChecksum("qwerty",
+                                     "65e84be33532fb784c48129675f9eff3a682b27168c0ea744b2cf58ee02337c5"));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp b/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp
new file mode 100644
index 00000000000..7e62a87b64f
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/entities_index_ut.cpp
@@ -0,0 +1,358 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/misc/roles/entities_index.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <array>
+
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(RolesEntitiesIndex) {
+    Y_UNIT_TEST(Stage) {
+        TEntitiesIndex::TStage stage({
+            "key#1",
+            "key#2",
+            "key#3",
+            "key#4",
+        });
+
+        const std::vector<std::vector<TString>> results = {
+            {"key#1"},
+            {"key#2"},
+            {"key#1", "key#2"},
+            {"key#3"},
+            {"key#1", "key#3"},
+            {"key#2", "key#3"},
+            {"key#1", "key#2", "key#3"},
+            {"key#4"},
+            {"key#1", "key#4"},
+            {"key#2", "key#4"},
+            {"key#1", "key#2", "key#4"},
+            {"key#3", "key#4"},
+            {"key#1", "key#3", "key#4"},
+            {"key#2", "key#3", "key#4"},
+            {"key#1", "key#2", "key#3", "key#4"},
+        };
+
+        std::vector<TString> keys;
+        for (const std::vector<TString>& res : results) {
+            UNIT_ASSERT(stage.GetNextKeySet(keys));
+            UNIT_ASSERT_VALUES_EQUAL(keys, res);
+        }
+
+        UNIT_ASSERT_C(!stage.GetNextKeySet(keys), keys);
+    }
+
+    Y_UNIT_TEST(GetUniqueSortedKeys) {
+        std::vector<TEntityPtr> entities;
+
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>(),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>(),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#1"},
+            }),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>({
+                                     "key#1",
+                                 }),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+
+        entities = {
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#1"},
+            }),
+            std::make_shared<TEntity>(TEntity{
+                {"key#1", "value#11"},
+                {"key#2", "value#22"},
+            }),
+        };
+        UNIT_ASSERT_VALUES_EQUAL(std::set<TString>({
+                                     "key#1",
+                                     "key#2",
+                                 }),
+                                 TEntitiesIndex::GetUniqueSortedKeys(entities));
+    }
+
+    Y_UNIT_TEST(MakeUnique) {
+        const TEntityPtr entityA = std::make_shared<TEntity>(TEntity{{"key#1", "aaaa"}});
+        const TEntityPtr entityA2 = std::make_shared<TEntity>(TEntity{{"key#1", "aaaa"}});
+        const TEntityPtr entityB = std::make_shared<TEntity>(TEntity{{"key#1", "bbbb"}});
+
+        TEntitiesIndex::TSubTree idx = {
+            std::vector<TEntityPtr>{
+                entityA,
+                entityA,
+            },
+            TEntitiesIndex::TIdxByAttrs{
+                {
+                    TKeyValue{"key#1", "value#11"},
+                    TEntitiesIndex::TSubTree{
+                        std::vector<TEntityPtr>{
+                            entityA,
+                            entityB,
+                            entityA,
+                        },
+                        TEntitiesIndex::TIdxByAttrs{
+                            {
+                                TKeyValue{"key#2", "value#21"},
+                                TEntitiesIndex::TSubTree{
+                                    std::vector<TEntityPtr>{
+                                        entityA,
+                                        entityB,
+                                        entityA,
+                                    },
+                                    TEntitiesIndex::TIdxByAttrs{},
+                                },
+                            },
+                        },
+                    },
+                },
+                {
+                    TKeyValue{"key#1", "value#12"},
+                    TEntitiesIndex::TSubTree{
+                        std::vector<TEntityPtr>{
+                            entityA,
+                            entityB,
+                            entityA2,
+                        },
+                        TEntitiesIndex::TIdxByAttrs{},
+                    },
+                },
+            },
+        };
+
+        TEntitiesIndex::MakeUnique(idx);
+
+        UNIT_ASSERT_VALUES_EQUAL(idx.Entities.size(), 1);
+
+        auto it = idx.SubTree.find(TKeyValue{"key#1", "value#12"});
+        UNIT_ASSERT(it != idx.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+
+        it = idx.SubTree.find(TKeyValue{"key#1", "value#11"});
+        UNIT_ASSERT(it != idx.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+
+        it = it->second.SubTree.find(TKeyValue{"key#2", "value#21"});
+        UNIT_ASSERT(it != it->second.SubTree.end());
+        UNIT_ASSERT_VALUES_EQUAL(it->second.Entities.size(), 2);
+    }
+
+    Y_UNIT_TEST(GetByAttrs) {
+        const TEntitiesIndex index = CreateEntitiesIndex();
+
+        UNIT_ASSERT_STRINGS_EQUAL(
+            index.PrintDebugString(),
+            R"(
+"key#1/value#11"
+    "key#2/value#22"
+        "key#3/value#33"
+    "key#2/value#23"
+        "key#3/value#33"
+    "key#3/value#33"
+"key#1/value#13"
+    "key#3/value#33"
+"key#2/value#22"
+    "key#3/value#33"
+"key#2/value#23"
+    "key#3/value#33"
+"key#3/value#33"
+)");
+
+        struct TCase {
+            TEntity AttrsToFind;
+            std::vector<TEntity> Result;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                TEntity{},
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#11"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#1", "value#14"},
+                },
+                std::vector<TEntity>{},
+            },
+            {
+                TEntity{
+                    {"key#2", "value#22"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+            {
+                TEntity{
+                    {"key#3", "value#33"},
+                },
+                std::vector<TEntity>{
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    },
+                    TEntity{
+                        {"key#1", "value#13"},
+                        {"key#3", "value#33"},
+                    },
+                },
+            },
+        };
+
+        for (const TCase& c : cases) {
+            std::vector<TEntityPtr> expected;
+            for (const TEntity& e : c.Result) {
+                expected.push_back(std::make_shared<TEntity>(e));
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL_C(
+                index.GetEntitiesWithAttrs(c.AttrsToFind.begin(), c.AttrsToFind.end()),
+                expected,
+                "'" << c.AttrsToFind << "'");
+        }
+    }
+
+    Y_UNIT_TEST(Contains) {
+        const TEntitiesIndex index = CreateEntitiesIndex();
+
+        struct TCase {
+            TEntity Exact;
+            bool Result = false;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                TEntity{},
+                false,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#11"},
+                },
+                true,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                },
+                false,
+            },
+            {
+                TEntity{
+                    {"key#1", "value#13"},
+                    {"key#3", "value#33"},
+                },
+                true,
+            },
+        };
+
+        for (const TCase& c : cases) {
+            UNIT_ASSERT_VALUES_EQUAL_C(
+                index.ContainsExactEntity(c.Exact.begin(), c.Exact.end()),
+                c.Result,
+                "'" << c.Exact << "'");
+        }
+    }
+}
+
+template <>
+void Out<std::vector<TString>>(IOutputStream& o, const std::vector<TString>& s) {
+    for (const auto& key : s) {
+        o << key << ",";
+    }
+}
+
+template <>
+void Out<std::set<TString>>(IOutputStream& o, const std::set<TString>& s) {
+    for (const auto& key : s) {
+        o << key << ",";
+    }
+}
+
+template <>
+void Out<std::vector<TEntityPtr>>(IOutputStream& o, const std::vector<TEntityPtr>& v) {
+    for (const TEntityPtr& p : v) {
+        o << *p << Endl;
+    }
+}
+
+template <>
+void Out<TEntityPtr>(IOutputStream& o, const TEntityPtr& v) {
+    o << *v;
+}
+
+template <>
+void Out<TEntity>(IOutputStream& o, const TEntity& v) {
+    for (const auto& [key, value] : v) {
+        o << key << "->" << value << Endl;
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp b/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp
new file mode 100644
index 00000000000..87f8ade267d
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/parser_ut.cpp
@@ -0,0 +1,160 @@
+#include <library/cpp/tvmauth/client/misc/roles/parser.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/json/json_reader.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Parser) {
+    static NJson::TJsonValue ToJsonValue(TStringBuf body) {
+        NJson::TJsonValue doc;
+        UNIT_ASSERT(NJson::ReadJsonTree(body, &doc));
+        return doc;
+    }
+
+    Y_UNIT_TEST(GetEntity) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetEntity(ToJsonValue(R"({"scope": false})"),
+                               "cons",
+                               "read"),
+            yexception,
+            "entity is map (str->str), got value Boolean. consumer 'cons' with role 'read'");
+
+        TEntityPtr en;
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntity(ToJsonValue(R"({})"),
+                                    "cons",
+                                    "read"));
+        UNIT_ASSERT_VALUES_EQUAL(en->size(), 0);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntity(ToJsonValue(R"({"key1": "val1", "key2": "val2"})"),
+                                    "cons",
+                                    "read"));
+        UNIT_ASSERT_VALUES_EQUAL(en->size(), 2);
+    }
+
+    Y_UNIT_TEST(GetEntities) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetEntities(ToJsonValue(R"([{},[]])"),
+                                 "cons",
+                                 "read"),
+            yexception,
+            "role entity for role must be map: consumer 'cons' with role 'read' has Array");
+
+        TEntitiesPtr en;
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntities(ToJsonValue(R"([])"),
+                                      "cons",
+                                      "read"));
+        UNIT_ASSERT(!en->Contains({}));
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            en = TParser::GetEntities(ToJsonValue(R"([{}])"),
+                                      "cons",
+                                      "read"));
+        UNIT_ASSERT(en->Contains({}));
+    }
+
+    Y_UNIT_TEST(GetConsumer) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumer(ToJsonValue(R"({"role1": [],"role2": {}})"),
+                                 "cons"),
+            yexception,
+            "entities for roles must be array: 'role2' is Map");
+
+        TConsumerRolesPtr c;
+        UNIT_ASSERT_NO_EXCEPTION(
+            c = TParser::GetConsumer(ToJsonValue(R"({"role1": [],"role2": []})"),
+                                     "cons"));
+        UNIT_ASSERT(c->HasRole("role1"));
+        UNIT_ASSERT(c->HasRole("role2"));
+        UNIT_ASSERT(!c->HasRole("role3"));
+    }
+
+    Y_UNIT_TEST(GetConsumers) {
+        TRoles::TTvmConsumers cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(0, cons.size());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {}})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(0, cons.size());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": []})"),
+                                          "tvm"),
+            yexception,
+            "'tvm' must be object");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"asd": []}})"),
+                                          "tvm"),
+            yexception,
+            "roles for consumer must be map: 'asd' is Array");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"asd": {}}})"),
+                                          "tvm"),
+            yexception,
+            "id must be valid positive number of proper size for tvm. got 'asd'");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"1120000000001062": {}}})"),
+                                          "tvm"),
+            yexception,
+            "id must be valid positive number of proper size for tvm. got '1120000000001062'");
+        UNIT_ASSERT_NO_EXCEPTION(
+            TParser::GetConsumers<TUid>(ToJsonValue(R"({"user": {"1120000000001062": {}}})"),
+                                        "user"));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"42": {}, "042": {}}})"),
+                                          "tvm"),
+            yexception,
+            "consumer duplicate detected: '42' for tvm");
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = TParser::GetConsumers<TTvmId>(ToJsonValue(R"({"tvm": {"42": {}}})"),
+                                                 "tvm"));
+        UNIT_ASSERT_VALUES_EQUAL(1, cons.size());
+    }
+
+    Y_UNIT_TEST(GetMeta) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({})")),
+            yexception,
+            "Missing 'revision'");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": null})")),
+            yexception,
+            "'revision' has unexpected type: Null");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": 100500})")),
+            yexception,
+            "Missing 'born_date'");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TParser::GetMeta(ToJsonValue(R"({"revision": 100500, "born_date": false})")),
+            yexception,
+            "key 'born_date' must be uint");
+
+        TRoles::TMeta meta;
+        UNIT_ASSERT_NO_EXCEPTION(
+            meta = TParser::GetMeta(ToJsonValue(R"({"revision": 100500, "born_date": 42})")));
+        UNIT_ASSERT_VALUES_EQUAL("100500", meta.Revision);
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(42), meta.BornTime);
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            meta = TParser::GetMeta(ToJsonValue(R"({"revision": "100501", "born_date": 42})")));
+        UNIT_ASSERT_VALUES_EQUAL("100501", meta.Revision);
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(42), meta.BornTime);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp b/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp
new file mode 100644
index 00000000000..5ba28d54353
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/roles_ut.cpp
@@ -0,0 +1,415 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/exception.h>
+#include <library/cpp/tvmauth/client/misc/roles/roles.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <array>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NRoles;
+
+Y_UNIT_TEST_SUITE(Roles) {
+    Y_UNIT_TEST(EntContains) {
+        TEntities ent(CreateEntitiesIndex());
+
+        UNIT_ASSERT(ent.Contains({{"key#1", "value#11"}}));
+        UNIT_ASSERT(ent.Contains({
+            {"key#1", "value#13"},
+            {"key#3", "value#33"},
+        }));
+        UNIT_ASSERT(!ent.Contains({{"key#111", "value#11"}}));
+        UNIT_ASSERT(!ent.Contains({
+            {"key#111", "value#13"},
+            {"key#3", "value#33"},
+        }));
+
+        // valid calls
+        {
+            std::array<const std::pair<TStringBuf, TString>, 1> arr = {{{"key#1", "value#11"}}};
+            UNIT_ASSERT(ent.ContainsSortedUnique<TStringBuf>({arr.begin(), arr.end()}));
+        }
+        {
+            std::array<const std::pair<TString, TStringBuf>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            bool res = ent.ContainsSortedUnique<TString, TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT(res);
+        }
+        {
+            std::array<const std::pair<TStringBuf, TStringBuf>, 1> arr = {{{"key#111", "value#11"}}};
+            bool res = ent.ContainsSortedUnique<TStringBuf, TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT(!res);
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#111", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            UNIT_ASSERT(!ent.ContainsSortedUnique({arr.begin(), arr.end()}));
+        }
+
+        // invalid calls
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#3", "value#33"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.ContainsSortedUnique({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not sorted: 'key#3' before 'key#1'");
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.ContainsSortedUnique({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not unique: 'key#1'");
+        }
+    }
+
+    Y_UNIT_TEST(EntWithAttrs) {
+        TEntities ent(CreateEntitiesIndex());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            ent.GetEntitiesWithAttrs({{"key#1", "value#11"}}),
+            std::vector<TEntityPtr>({
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                }),
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                    {"key#2", "value#22"},
+                    {"key#3", "value#33"},
+                }),
+                std::make_shared<TEntity>(TEntity{
+                    {"key#1", "value#11"},
+                    {"key#2", "value#23"},
+                    {"key#3", "value#33"},
+                }),
+            }));
+        UNIT_ASSERT_VALUES_EQUAL(
+            ent.GetEntitiesWithAttrs({{"key#111", "value#11"}}),
+            std::vector<TEntityPtr>());
+
+        // valid calls
+        {
+            std::array<const std::pair<TStringBuf, TString>, 2> arr = {{
+                {"key#1", "value#11"},
+                {"key#3", "value#33"},
+            }};
+            auto vec = ent.GetEntitiesWithSortedUniqueAttrs<TStringBuf>({arr.begin(), arr.end()});
+            UNIT_ASSERT_VALUES_EQUAL(
+                vec,
+                std::vector<TEntityPtr>({
+                    std::make_shared<TEntity>(TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#22"},
+                        {"key#3", "value#33"},
+                    }),
+                    std::make_shared<TEntity>(TEntity{
+                        {"key#1", "value#11"},
+                        {"key#2", "value#23"},
+                        {"key#3", "value#33"},
+                    }),
+                }));
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#111", "value#13"},
+                {"key#3", "value#33"},
+            }};
+            UNIT_ASSERT_VALUES_EQUAL(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                std::vector<TEntityPtr>());
+        }
+
+        // invalid calls
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#3", "value#33"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not sorted: 'key#3' before 'key#1'");
+        }
+        {
+            std::array<const std::pair<TString, TString>, 2> arr = {{
+                {"key#1", "value#13"},
+                {"key#1", "value#13"},
+            }};
+            UNIT_ASSERT_EXCEPTION_CONTAINS(
+                ent.GetEntitiesWithSortedUniqueAttrs({arr.begin(), arr.end()}),
+                TIllegalUsage,
+                "attrs are not unique: 'key#1'");
+        }
+    }
+
+    Y_UNIT_TEST(Consumer) {
+        TConsumerRoles c({
+            {"read", std::make_shared<TEntities>(CreateEntitiesIndex())},
+            {"write", std::make_shared<TEntities>(CreateEntitiesIndex())},
+        });
+
+        UNIT_ASSERT(c.HasRole("read"));
+        UNIT_ASSERT(c.HasRole("write"));
+        UNIT_ASSERT(!c.HasRole("access"));
+
+        UNIT_ASSERT_EQUAL(nullptr, c.GetEntitiesForRole("access"));
+
+        TEntitiesPtr ent = c.GetEntitiesForRole("read");
+        UNIT_ASSERT_UNEQUAL(nullptr, ent);
+        UNIT_ASSERT(ent->Contains({{"key#1", "value#11"}}));
+        UNIT_ASSERT(!ent->Contains({{"key#111", "value#11"}}));
+
+        UNIT_ASSERT(c.CheckRoleForExactEntity("read", {{"key#1", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("acess", {{"key#1", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("read", {{"key#111", "value#11"}}));
+        UNIT_ASSERT(!c.CheckRoleForExactEntity("read", {}));
+    }
+
+    Y_UNIT_TEST(RolesService) {
+        TRoles r(
+            {},
+            {
+                {100500, std::make_shared<TConsumerRoles>(THashMap<TString, TEntitiesPtr>{
+                             {"write", std::make_shared<TEntities>(CreateEntitiesIndex())},
+                         })},
+            },
+            {},
+            std::make_shared<TString>());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForService(NUnittest::CreateServiceTicket(
+                ETicketStatus::InvalidDst,
+                100500)),
+            TIllegalUsage,
+            "Service ticket must be valid, got: InvalidDst");
+
+        TConsumerRolesPtr cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = r.GetRolesForService(NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501)));
+        UNIT_ASSERT_EQUAL(nullptr, cons);
+
+        cons = r.GetRolesForService(NUnittest::CreateServiceTicket(
+            ETicketStatus::Ok,
+            100500));
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT(!cons->HasRole("read"));
+        UNIT_ASSERT(cons->HasRole("write"));
+
+        ////shortcuts
+        // no tvmid
+        UNIT_ASSERT(!r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501),
+            "write"));
+
+        // no role
+        UNIT_ASSERT(!r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "read"));
+
+        // success
+        UNIT_ASSERT(r.CheckServiceRole(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write"));
+
+        // no tvmid
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100501),
+            "write",
+            {{"key#1", "value#11"}}));
+
+        // no role
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "read",
+            {{"key#1", "value#11"}}));
+
+        // no entity
+        UNIT_ASSERT(!r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write",
+            {{"key#111", "value#11"}}));
+
+        // success
+        UNIT_ASSERT(r.CheckServiceRoleForExactEntity(
+            NUnittest::CreateServiceTicket(
+                ETicketStatus::Ok,
+                100500),
+            "write",
+            {{"key#1", "value#11"}}));
+    }
+
+    Y_UNIT_TEST(RolesUser) {
+        TRoles r(
+            {},
+            {},
+            {
+                {789654, std::make_shared<TConsumerRoles>(THashMap<TString, TEntitiesPtr>{
+                             {"read", std::make_shared<TEntities>(CreateEntitiesIndex())},
+                         })},
+            },
+            std::make_shared<TString>("some roles"));
+
+        UNIT_ASSERT_VALUES_EQUAL("some roles", r.GetRaw());
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                ETicketStatus::Malformed,
+                789654,
+                {})),
+            TIllegalUsage,
+            "User ticket must be valid, got: Malformed");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                  ETicketStatus::Ok,
+                                  789654,
+                                  {}),
+                              789123),
+            TIllegalUsage,
+            "User ticket must be from ProdYateam, got from Test");
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                  ETicketStatus::Ok,
+                                  789654,
+                                  {},
+                                  {},
+                                  EBlackboxEnv::ProdYateam),
+                              789123),
+            TIllegalUsage,
+            "selectedUid must be in user ticket but it's not: 789123");
+
+        TConsumerRolesPtr cons;
+        UNIT_ASSERT_NO_EXCEPTION(
+            cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam)));
+        UNIT_ASSERT_EQUAL(nullptr, cons);
+
+        cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+            ETicketStatus::Ok,
+            789654,
+            {},
+            {},
+            EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT(cons->HasRole("read"));
+        UNIT_ASSERT(!cons->HasRole("write"));
+
+        cons = r.GetRolesForUser(NUnittest::CreateUserTicket(
+                                     ETicketStatus::Ok,
+                                     789123,
+                                     {},
+                                     {789654, 789741},
+                                     EBlackboxEnv::ProdYateam),
+                                 789654);
+        UNIT_ASSERT_UNEQUAL(nullptr, cons);
+        UNIT_ASSERT(cons->HasRole("read"));
+        UNIT_ASSERT(!cons->HasRole("write"));
+
+        ////shortcuts
+        // no uid
+        UNIT_ASSERT(!r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read"));
+
+        // no role
+        UNIT_ASSERT(!r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "wrire"));
+
+        // success
+        UNIT_ASSERT(r.CheckUserRole(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read"));
+
+        // no uid
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789123,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#1", "value#11"}}));
+
+        // no role
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "wrire",
+            {{"key#1", "value#11"}}));
+
+        // no entity
+        UNIT_ASSERT(!r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#111", "value#11"}}));
+
+        // success
+        UNIT_ASSERT(r.CheckUserRoleForExactEntity(
+            NUnittest::CreateUserTicket(
+                ETicketStatus::Ok,
+                789654,
+                {},
+                {},
+                EBlackboxEnv::ProdYateam),
+            "read",
+            {{"key#1", "value#11"}}));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp b/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp
new file mode 100644
index 00000000000..7eaf611e82a
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/roles/tvmapi_roles_fetcher_ut.cpp
@@ -0,0 +1,197 @@
+#include <library/cpp/tvmauth/client/ut/common.h>
+
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/api/roles_fetcher.h>
+
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/stream/file.h>
+#include <util/system/fs.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NTvmApi;
+
+Y_UNIT_TEST_SUITE(TvmApiRolesFetcher) {
+    static const TString ROLES = R"({"revision": "100501", "born_date": 42})";
+
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    Y_UNIT_TEST(ReadFromDisk) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        s.IdmSystemSlug = "fem\tida";
+        TRolesFetcher fetcher(s, logger);
+
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), fetcher.ReadFromDisk());
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: File './tmp/roles' does not exist\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        const TInstant now = TInstant::Seconds(TInstant::Now().Seconds());
+
+        TDiskWriter wr(CACHE_DIR + "roles");
+        UNIT_ASSERT(wr.Write("kek", now));
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.ReadFromDisk());
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                << "4: Roles in disk cache are for another slug (kek). Self=fem\tida\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(ROLES, "femida_test"), now));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), fetcher.ReadFromDisk());
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                   "4: Roles in disk cache are for another slug (femida_test). Self=fem\tida\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(ROLES, "fem\tida"), now));
+        UNIT_ASSERT_VALUES_EQUAL(now, fetcher.ReadFromDisk());
+        UNIT_ASSERT(fetcher.AreRolesOk());
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/roles' was successfully read\n"
+                   "7: Succeed to read roles with revision 100501 from ./tmp/roles\n",
+            logger->Stream.Str());
+        logger->Stream.clear();
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdate) {
+        TRetrySettings settings;
+        settings.RolesUpdatePeriod = TDuration::Minutes(123);
+
+        UNIT_ASSERT(!TRolesFetcher::IsTimeToUpdate(settings, TDuration::Seconds(5)));
+        UNIT_ASSERT(TRolesFetcher::IsTimeToUpdate(settings, TDuration::Hours(5)));
+    }
+
+    Y_UNIT_TEST(ShouldWarn) {
+        TRetrySettings settings;
+        settings.RolesWarnPeriod = TDuration::Minutes(123);
+
+        UNIT_ASSERT(!TRolesFetcher::ShouldWarn(settings, TDuration::Seconds(5)));
+        UNIT_ASSERT(TRolesFetcher::ShouldWarn(settings, TDuration::Hours(5)));
+    }
+
+    Y_UNIT_TEST(Update) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        TRolesFetcher fetcher(s, logger);
+
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+
+        NUtils::TFetchResult fetchResult;
+        fetchResult.Code = 304;
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "tirole did not return any roles because current roles are actual, but there are no roles in memory");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 206;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "Unexpected code from tirole: 206.");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 200;
+        fetchResult.Response = "kek";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "Invalid json. 'kek'");
+        UNIT_ASSERT(!fetcher.AreRolesOk());
+        UNIT_ASSERT(!NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Response = ROLES;
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.Update(NUtils::TFetchResult(fetchResult)));
+        UNIT_ASSERT(fetcher.AreRolesOk());
+        UNIT_ASSERT(NFs::Exists(CACHE_DIR + "roles"));
+        {
+            TFileInput f(CACHE_DIR + "roles");
+            TString body = f.ReadAll();
+            UNIT_ASSERT_C(body.Contains(ROLES), "got body: '" << body << "'");
+        }
+
+        fetchResult.Code = 304;
+        fetchResult.Response.clear();
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.Update(NUtils::TFetchResult(fetchResult)));
+        UNIT_ASSERT(fetcher.AreRolesOk());
+        UNIT_ASSERT(NFs::Exists(CACHE_DIR + "roles"));
+
+        fetchResult.Code = 200;
+        fetchResult.Headers.AddHeader("X-Tirole-Compression", "kek");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            fetcher.Update(NUtils::TFetchResult(fetchResult)),
+            yexception,
+            "unknown codec format version; known: 1; got: kek");
+    }
+
+    Y_UNIT_TEST(CreateTiroleRequest) {
+        CleanCache();
+        auto logger = MakeIntrusive<TLogger>();
+
+        TRolesFetcherSettings s;
+        s.CacheDir = CACHE_DIR;
+        s.SelfTvmId = 111111;
+        s.IdmSystemSlug = "some sys";
+        TRolesFetcher fetcher(s, logger);
+
+        TRolesFetcher::TRequest req = fetcher.CreateTiroleRequest("some_ticket");
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v1/get_actual_roles?system_slug=some+sys&_pid=&lib_version=client_",
+            TStringBuf(req.Url).Chop(5));
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({
+                {"X-Ya-Service-Ticket", "some_ticket"},
+            }),
+            req.Headers);
+
+        TDiskWriter wr(CACHE_DIR + "roles");
+        UNIT_ASSERT(wr.Write(TRolesFetcher::PrepareDiskFormat(
+            R"({"revision": "asd&qwe", "born_date": 42})",
+            "some sys")));
+        UNIT_ASSERT_NO_EXCEPTION(fetcher.ReadFromDisk());
+
+        req = fetcher.CreateTiroleRequest("some_ticket");
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/v1/get_actual_roles?system_slug=some+sys&_pid=&lib_version=client_",
+            TStringBuf(req.Url).Chop(5));
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({
+                {"If-None-Match", R"("asd&qwe")"},
+                {"X-Ya-Service-Ticket", "some_ticket"},
+            }),
+            req.Headers);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/settings_ut.cpp b/library/cpp/tvmauth/client/ut/settings_ut.cpp
new file mode 100644
index 00000000000..76c9542442e
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/settings_ut.cpp
@@ -0,0 +1,169 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/misc/api/settings.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(ClientSettings) {
+#if !defined(_win_)
+    Y_UNIT_TEST(CheckValid) {
+        struct TTestCase {
+            TString Name;
+            NTvmApi::TClientSettings Settings;
+            TString Err;
+        };
+        std::vector<TTestCase> cases = {
+            TTestCase{
+                .Name = "default",
+                .Settings = {},
+                .Err = "Invalid settings: nothing to do",
+            },
+            TTestCase{
+                .Name = "only secret",
+                .Settings = {
+                    .Secret = TStringBuf("foobar"),
+                },
+                .Err = "Secret is present but destinations list is empty. It makes no sense",
+            },
+            TTestCase{
+                .Name = "only dsts",
+                .Settings = {
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "SelfTvmId cannot be 0 if fetching of Service Tickets required",
+            },
+            TTestCase{
+                .Name = "dsts with selfTvmId",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "Secret is required for fetching of Service Tickets",
+            },
+            TTestCase{
+                .Name = "correct service tickets fetching",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .Secret = TStringBuf("foobar"),
+                    .FetchServiceTicketsForDsts = {42},
+                },
+                .Err = "",
+            },
+            TTestCase{
+                .Name = "only check srv flag",
+                .Settings = {
+                    .CheckServiceTickets = true,
+                },
+                .Err = "SelfTvmId cannot be 0 if checking of Service Tickets required",
+            },
+            TTestCase{
+                .Name = "tirole without disk cache",
+                .Settings = {
+                    .SelfTvmId = 43,
+                    .Secret = TStringBuf("foobar"),
+                    .FetchRolesForIdmSystemSlug = "kek",
+                },
+                .Err = "Disk cache must be enabled to use roles: they can be heavy",
+            },
+        };
+
+        for (const TTestCase& c : cases) {
+            if (c.Err) {
+                UNIT_ASSERT_EXCEPTION_CONTAINS_C(
+                    c.Settings.CheckValid(),
+                    TBrokenTvmClientSettings,
+                    c.Err,
+                    c.Name);
+            } else {
+                UNIT_ASSERT_NO_EXCEPTION_C(c.Settings.CheckValid(), c.Name);
+            }
+        }
+
+        NTvmApi::TClientSettings s{.DiskCacheDir = "/impossible/dir"};
+        UNIT_ASSERT_EXCEPTION(s.CheckValid(), TPermissionDenied);
+    }
+
+    Y_UNIT_TEST(CloneNormalized) {
+        NTvmApi::TClientSettings original;
+        original.FetchServiceTicketsForDsts = {43};
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(original.CloneNormalized(),
+                                       TBrokenTvmClientSettings,
+                                       "SelfTvmId cannot be 0 if fetching of Service Tickets required");
+        original.SelfTvmId = 15;
+        original.Secret = "bar";
+        original.DiskCacheDir = "./";
+
+        NTvmApi::TClientSettings::TDstVector expected = {43};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchServiceTicketsForDstsWithAliases = {{"foo", 42}};
+        expected = {42, 43};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchRolesForIdmSystemSlug = "kek";
+        expected = {42, 43, 2028120};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+
+        original.FetchServiceTicketsForDsts.push_back(2028120);
+        expected = {42, 43, 2028120};
+        UNIT_ASSERT_VALUES_EQUAL(expected, original.CloneNormalized().FetchServiceTicketsForDsts);
+    }
+
+    Y_UNIT_TEST(NeedServiceTicketsFetching) {
+        NTvmApi::TClientSettings s;
+
+        UNIT_ASSERT(!s.NeedServiceTicketsFetching());
+
+        s.FetchServiceTicketsForDsts = {42};
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchServiceTicketsForDsts.clear();
+
+        s.FetchServiceTicketsForDstsWithAliases = {{"foo", 42}};
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchServiceTicketsForDstsWithAliases.clear();
+
+        s.FetchRolesForIdmSystemSlug = "bar";
+        UNIT_ASSERT(s.NeedServiceTicketsFetching());
+        s.FetchRolesForIdmSystemSlug.clear();
+    }
+
+    Y_UNIT_TEST(permitions) {
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions("/qwerty"), TPermissionDenied);
+
+        const TString tmpDir = "./cache_dir";
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_OWNER_WRITE | NFs::FP_GROUP_WRITE | NFs::FP_ALL_WRITE);
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir), TPermissionDenied);
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_OWNER_READ | NFs::FP_GROUP_READ | NFs::FP_ALL_READ);
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir), TPermissionDenied);
+
+        NFs::RemoveRecursive(tmpDir);
+        NFs::MakeDirectory(tmpDir, NFs::FP_COMMON_FILE);
+        UNIT_ASSERT_NO_EXCEPTION(NTvmApi::TClientSettings::CheckPermissions(tmpDir));
+    }
+#endif
+
+    Y_UNIT_TEST(Dst) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmApi::TClientSettings::TDst(0), yexception, "TvmId cannot be 0");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmApi::TClientSettings::TDstMap({{"blackbox", 0}}),
+                                       TBrokenTvmClientSettings,
+                                       "TvmId cannot be 0");
+    }
+
+    Y_UNIT_TEST(Fetching) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(125);
+
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        UNIT_ASSERT_NO_EXCEPTION(s.CheckValid());
+
+        UNIT_ASSERT_VALUES_EQUAL(s.FetchServiceTicketsForDsts.size(), 1);
+        UNIT_ASSERT_VALUES_EQUAL(s.FetchServiceTicketsForDsts[0], 19);
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/src_checker_ut.cpp b/library/cpp/tvmauth/client/ut/src_checker_ut.cpp
new file mode 100644
index 00000000000..bd1646d6b98
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/src_checker_ut.cpp
@@ -0,0 +1,47 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/src_checker.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/tvmauth/type.h>
+#include <library/cpp/tvmauth/unittest.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NTvmAuth;
+
+Y_UNIT_TEST_SUITE(SrcChecker) {
+    Y_UNIT_TEST(Ctor) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            TSrcChecker(new TMockedUpdater),
+            TBrokenTvmClientSettings,
+            "Need to use TClientSettings::EnableRolesFetching");
+    }
+
+    Y_UNIT_TEST(Check) {
+        NRoles::TRolesPtr roles = std::make_shared<NRoles::TRoles>(
+            NRoles::TRoles::TMeta{},
+            NRoles::TRoles::TTvmConsumers{
+                {12345, std::make_shared<NRoles::TConsumerRoles>(
+                            THashMap<TString, NRoles::TEntitiesPtr>())},
+            },
+            NRoles::TRoles::TUserConsumers{},
+            std::make_shared<TString>());
+        const TSrcChecker checker(new TMockedUpdater({.Roles = roles}));
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(
+            checker.Check(NUnittest::CreateServiceTicket(ETicketStatus::Expired, 12345)),
+            TIllegalUsage,
+            "Service ticket must be valid");
+
+        TCheckedServiceTicket ticket;
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = checker.Check(NUnittest::CreateServiceTicket(ETicketStatus::Ok, 12345)));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::Ok, ticket.GetStatus());
+
+        UNIT_ASSERT_NO_EXCEPTION(
+            ticket = checker.Check(NUnittest::CreateServiceTicket(ETicketStatus::Ok, 9999)));
+        UNIT_ASSERT_VALUES_EQUAL(ETicketStatus::NoRoles, ticket.GetStatus());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp b/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp
new file mode 100644
index 00000000000..4cf449711bc
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/tvmapi_updater_ut.cpp
@@ -0,0 +1,1272 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/mocked_updater.h>
+#include <library/cpp/tvmauth/client/misc/disk_cache.h>
+#include <library/cpp/tvmauth/client/misc/api/threaded_updater.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+#include <library/cpp/testing/unittest/tests_data.h>
+
+#include <util/stream/file.h>
+#include <util/string/subst.h>
+#include <util/system/fs.h>
+
+#include <regex>
+
+using namespace NTvmAuth;
+static const std::regex TIME_REGEX(R"(\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d.\d{6}Z)");
+
+Y_UNIT_TEST_SUITE(ApiUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString TVM_RESPONSE =
+        R"({
+            "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+            "213" : { "ticket" : "service_ticket_2"},
+            "234" : { "error" : "Dst is not found" },
+            "185" : { "ticket" : "service_ticket_3"},
+            "deprecated" : { "ticket" : "deprecated_ticket" }
+        })";
+
+    static const TString CACHE_DIR = "./tmp/";
+
+    static void CleanCache() {
+        NFs::RemoveRecursive(CACHE_DIR);
+        NFs::MakeDirectoryRecursive(CACHE_DIR);
+    }
+
+    Y_UNIT_TEST(MockedUpdater) {
+        TMockedUpdater m;
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, m.GetStatus());
+        UNIT_ASSERT(m.GetCachedServiceContext()->Check(SRV_TICKET));
+        UNIT_ASSERT(m.GetCachedUserContext()->Check(TEST_TICKET));
+    }
+
+    Y_UNIT_TEST(Updater) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(GetCachePath());
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            auto u = NTvmApi::TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().find("was successfully read") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Updater_badConfig) {
+        NTvmApi::TClientSettings s;
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+        s.SetSelfTvmId(100500);
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+        s.SetDiskCacheDir(GetCachePath());
+        UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()), yexception);
+    }
+
+    class TOfflineUpdater: public NTvmApi::TThreadedUpdater {
+        bool Enabled_;
+        TString PublicKeys_;
+
+    public:
+        TOfflineUpdater(const NTvmApi::TClientSettings& settings,
+                        TIntrusivePtr<TLogger> l,
+                        bool enabled = false,
+                        TString keys = NUnittest::TVMKNIFE_PUBLIC_KEYS)
+            : NTvmApi::TThreadedUpdater(settings, l)
+            , Enabled_(enabled)
+            , PublicKeys_(keys)
+        {
+            Init();
+            StartWorker();
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString&) const override {
+            if (!Enabled_) {
+                throw yexception() << "alarm";
+            }
+            return {200, {}, "/2/ticket", TVM_RESPONSE, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (!Enabled_) {
+                throw yexception() << "alarm";
+            }
+            return {200, {}, "/2/keys", PublicKeys_, ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartWithoutCache) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.EnableServiceTicketChecking();
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to get ServiceTickets: alarm\n"
+                << "4: Failed to update service tickets: alarm\n"
+                << "3: Service tickets have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    static void WriteFile(TString name, TStringBuf body, TInstant time) {
+        NFs::Remove(CACHE_DIR + name);
+        TFileOutput f(CACHE_DIR + name);
+        f << TDiskWriter::PrepareData(time, body);
+    }
+
+    Y_UNIT_TEST(StartWithOldCache) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  NUnittest::TVMKNIFE_PUBLIC_KEYS,
+                  TInstant::Now() - TDuration::Days(30)); // too old
+        WriteFile("./service_tickets",
+                  R"({"19":{"ticket":"3:serv:CBAQACIGCJSRBhAL:Fi"}})"
+                  "\t100500",
+                  TInstant::Now()); // too old
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().find("Disk cache (public keys) is too old") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("Disk cache (service tickets) is too old") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") != TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithMissingCache) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir("../");
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+
+        UNIT_ASSERT_C(l->Stream.Str().find("does not exist") != TString::npos, l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().find("were successfully fetched") == TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithBadCache_Tickets) {
+        CleanCache();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE,
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: Failed to read service tickets from disk: YYYYYYYYYYYYYYY\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"),
+                               std::regex(R"(Failed to read service tickets from disk: [^\n]+)"),
+                               "Failed to read service tickets from disk: YYYYYYYYYYYYYYY"));
+    }
+
+    Y_UNIT_TEST(StartWithBadCache_PublicKeys) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  "ksjdafnlskdjzfgbhdl",
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+
+        UNIT_ASSERT_C(l->Stream.Str().find("4: Failed to read public keys from disk: Malformed TVM keys") != TString::npos, l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(StartWithCacheForAnotherTvmId) {
+        CleanCache();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE + "\t" + "100499",
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "4: Disk cache is for another tvmId (100499). Self=100500\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithCacheForAnotherDsts) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("./service_tickets",
+                  R"({"213" : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEAs:T-"}})"
+                  "\t"
+                  "100500",
+                  now);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): " << TInstant::Seconds(now.Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was partly updated with 1 service ticket(s). total: 2\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 2 service ticket(s) from disk\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithNotFreshCacheForAnotherDsts) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("./service_tickets",
+                  R"({"213" : { "ticket" : "3:serv:CBAQ__________9_IgYIlJEGEAs:T-"}})"
+                  "\t"
+                  "100500",
+                  now - TDuration::Hours(2));
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 1 service ticket(s) from disk\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        l->Stream.Clear();
+
+        {
+            TOfflineUpdater u(s, l, true);
+            auto cache = u.GetCachedServiceTickets();
+            UNIT_ASSERT(cache->TicketsById.contains(213));
+            UNIT_ASSERT(cache->TicketsById.contains(19));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/service_tickets' was successfully read\n"
+                << "6: Got 2 service ticket(s) from disk\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartWithPartialDiskCache) {
+        CleanCache();
+        WriteFile("./public_keys",
+                  NUnittest::TVMKNIFE_PUBLIC_KEYS,
+                  TInstant::Now());
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"kolmo", 213}});
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOfflineUpdater u(s, l, true);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: File './tmp/service_tickets' does not exist\n"
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "6: Cache was updated with 2 service ticket(s): XXXXXXXXXXX\n"
+                << "6: File './tmp/service_tickets' was successfully written\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(StartFromHttpAndRestartFromDisk) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            {
+                TOfflineUpdater u(s, l, true);
+                UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL(
+                TStringBuilder()
+                    << "7: File './tmp/service_tickets' does not exist\n"
+                    << "7: File './tmp/public_keys' does not exist\n"
+                    << "7: File './tmp/retry_settings' does not exist\n"
+                    << "7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                    << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                    << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                    << "6: File './tmp/service_tickets' was successfully written\n"
+                    << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                    << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                    << "6: File './tmp/public_keys' was successfully written\n"
+                    << "7: Thread-worker started\n"
+                    << "7: Thread-worker stopped\n",
+                std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        }
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            {
+                TOfflineUpdater u(s, l, true);
+                UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+            }
+
+            UNIT_ASSERT_VALUES_EQUAL(
+                TStringBuilder()
+                    << "6: File './tmp/service_tickets' was successfully read\n"
+                    << "6: Got 1 service ticket(s) from disk\n"
+                    << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                    << "6: File './tmp/public_keys' was successfully read\n"
+                    << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                    << "7: File './tmp/retry_settings' does not exist\n"
+                    << "7: Thread-worker started\n"
+                    << "7: Thread-worker stopped\n",
+                std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+        }
+    }
+
+    class TUnstableUpdater: public NTvmApi::TThreadedUpdater {
+        mutable int V1_ = 0;
+        mutable int V2_ = 0;
+
+    public:
+        TUnstableUpdater(const NTvmApi::TClientSettings& settings, TIntrusivePtr<TLogger> l)
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            UNIT_ASSERT_NO_EXCEPTION_C(Init(), l->Stream.Str());
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, GetStatus(), l->Stream.Str());
+
+            Sleep(TDuration::MicroSeconds(100));
+            PublicKeysDurations_.Expiring = TDuration::MicroSeconds(100);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus(TClientStatus::Warning, "Internal client error: failed to collect last useful error message, please report this message to tvm-dev@yandex-team.ru"),
+                                       GetStatus(),
+                                       l->Stream.Str());
+
+            PublicKeysDurations_.Invalid = TDuration::MicroSeconds(20);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Error, GetStatus(), l->Stream.Str());
+
+            PublicKeysDurations_.Expiring = TDuration::Seconds(100);
+            PublicKeysDurations_.Invalid = TDuration::Seconds(200);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, GetStatus(), l->Stream.Str());
+
+            ServiceTicketsDurations_.Expiring = TDuration::MicroSeconds(100);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Warning, GetStatus(), l->Stream.Str());
+
+            ServiceTicketsDurations_.Invalid = TDuration::MicroSeconds(20);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Warning, GetStatus(), l->Stream.Str());
+
+            const TInstant* inv = &GetCachedServiceTickets()->InvalidationTime;
+            *const_cast<TInstant*>(inv) = TInstant::Now() + TDuration::Seconds(30);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Error, GetStatus(), l->Stream.Str());
+        }
+
+        NUtils::TFetchResult FetchServiceTicketsFromHttp(const TString&) const override {
+            Y_ENSURE_EX(++V1_ > 1, yexception() << "++v1_ > 1:" << V1_);
+            return {200, {}, "/2/ticket", TVM_RESPONSE, ""};
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            Y_ENSURE_EX(++V2_ > 2, yexception() << "++v2_ > 2:" << V2_);
+            return {200, {}, "/2/keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartFromUnstableHttp) {
+        CleanCache();
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TUnstableUpdater u(s, l);
+        }
+
+        UNIT_ASSERT_C(l->Stream.Str().Contains("++v1_ > 1"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("++v2_ > 2"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("7: Response with service tickets for 1 destination(s) was successfully fetched from https://tvm-api.yandex.net"), l->Stream.Str());
+        UNIT_ASSERT_C(l->Stream.Str().Contains("7: Public keys were successfully fetched"), l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(GetUpdateTimeOfServiceTickets) {
+        CleanCache();
+        TInstant ins = TInstant::Now();
+        WriteFile("./service_tickets",
+                  TVM_RESPONSE + "\t" + "100500",
+                  ins);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        TOfflineUpdater u(s, l, true);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfPublicKeys());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(ins.Seconds()), u.GetUpdateTimeOfServiceTickets());
+    }
+
+    class TSignalingUpdater: public NTvmApi::TThreadedUpdater {
+        mutable int V_ = 0;
+        TAutoEvent& Ev_;
+        const TStringBuf PublicKeys_;
+
+    public:
+        TSignalingUpdater(const NTvmApi::TClientSettings& settings,
+                          TLoggerPtr l,
+                          TAutoEvent& ev,
+                          const TStringBuf keys = NUnittest::TVMKNIFE_PUBLIC_KEYS)
+            : NTvmApi::TThreadedUpdater(settings, l)
+            , Ev_(ev)
+            , PublicKeys_(keys)
+        {
+            WorkerAwakingPeriod_ = TDuration::MilliSeconds(300);
+            PublicKeysDurations_.RefreshPeriod = TDuration::MilliSeconds(700);
+            Init();
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+        }
+
+        NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+            if (++V_ >= 2) {
+                Ev_.Signal();
+            }
+            return {200, {}, "/2/keys", TString(PublicKeys_), ""};
+        }
+    };
+
+    Y_UNIT_TEST(StartWorker) {
+        class TSignalingUpdater: public NTvmApi::TThreadedUpdater {
+            mutable int V_ = 0;
+            TAutoEvent& Ev_;
+
+        public:
+            TSignalingUpdater(const NTvmApi::TClientSettings& settings, TLoggerPtr l, TAutoEvent& ev)
+                : NTvmApi::TThreadedUpdater(settings, l)
+                , Ev_(ev)
+            {
+                WorkerAwakingPeriod_ = TDuration::MilliSeconds(300);
+                PublicKeysDurations_.RefreshPeriod = TDuration::MilliSeconds(700);
+                Init();
+                ExpBackoff_.SetEnabled(false);
+                StartWorker();
+            }
+
+            void Worker() override {
+                NTvmApi::TThreadedUpdater::Worker();
+                Ev_.Signal();
+            }
+
+            NUtils::TFetchResult FetchPublicKeysFromHttp() const override {
+                if (++V_ < 4) {
+                    return {500, {}, "/2/keys", "lol", ""};
+                }
+                return {200, {}, "/2/keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, "CAEQChkAAAAAAAD4PyGamZmZmZm5PyhkMAE4B0BGSAI"};
+            }
+        };
+
+        CleanCache();
+        TInstant expiringPubKeys = TInstant::Now() - TDuration::Days(3);
+        WriteFile("./public_keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, expiringPubKeys);
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        TAutoEvent ev;
+        {
+            TSignalingUpdater u(s, l, ev);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus(TClientStatus::Warning, "PublicKeys: Path:/2/keys.Code=500: lol"),
+                                     u.GetStatus());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(expiringPubKeys.Seconds()), u.GetUpdateTimeOfPublicKeys());
+            UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfServiceTickets());
+
+            UNIT_ASSERT(ev.WaitT(TDuration::Seconds(15)));
+            Sleep(TDuration::MilliSeconds(500));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to get PublicKeys: Path:/2/keys.Code=500: lol\n"
+                << "4: Failed to update public keys: Path:/2/keys.Code=500: lol\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker started\n"
+                << "7: Retry settings were updated: exponential_backoff_min:0.000000s->1.000000s;exponential_backoff_max:60.000000s->10.000000s;exponential_backoff_factor:2->1.5;exponential_backoff_jitter:0.5->0.1;max_random_sleep_default:5.000000s->0.100000s;retries_on_start:3->1;worker_awaking_period:10.000000s->7.000000s;dsts_limit:300->70;\n"
+                << "6: File './tmp/retry_settings' was successfully written\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "6: File './tmp/public_keys' was successfully written\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+#if defined(_unix_)
+    Y_UNIT_TEST(StartFromCacheAndBadPublicKeysFromHttp) {
+        CleanCache();
+        TInstant now = TInstant::Now();
+        WriteFile("public_keys", NUnittest::TVMKNIFE_PUBLIC_KEYS, now - TDuration::Days(3)); // expiring public keys
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.SetDiskCacheDir(CACHE_DIR);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAutoEvent ev;
+            TSignalingUpdater u(s, l, ev, "malformed keys");
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus(TClientStatus::Warning, "PublicKeys: Malformed TVM keys"),
+                                     u.GetStatus());
+
+            UNIT_ASSERT(ev.WaitT(TDuration::Seconds(15)));
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: File './tmp/public_keys' was successfully read\n"
+                << "6: Cache was updated with public keys: " << TInstant::Seconds((now - TDuration::Days(3)).Seconds()) << "\n"
+                << "7: File './tmp/retry_settings' does not exist\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker started\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+#endif
+
+    Y_UNIT_TEST(StartWithBadPublicKeysFromHttp) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+
+        auto l = MakeIntrusive<TLogger>();
+        TAutoEvent ev;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l, true, "some public keys"),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry:");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Public keys were successfully fetched from https://tvm-api.yandex.net\n"
+                << "4: Failed to update public keys: Malformed TVM keys\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    class TNotInitedUpdater: public NTvmApi::TThreadedUpdater {
+    public:
+        TNotInitedUpdater(const NTvmApi::TClientSettings& settings, TLoggerPtr l = TDevNullLogger::IAmBrave())
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            this->ExpBackoff_.SetEnabled(false);
+        }
+
+        using NTvmApi::TThreadedUpdater::AppendToJsonArray;
+        using NTvmApi::TThreadedUpdater::AreServicesTicketsOk;
+        using NTvmApi::TThreadedUpdater::CreateJsonArray;
+        using NTvmApi::TThreadedUpdater::FindMissingDsts;
+        using NTvmApi::TThreadedUpdater::GetPublicKeysFromHttp;
+        using NTvmApi::TThreadedUpdater::GetServiceTicketsFromHttp;
+        using NTvmApi::TThreadedUpdater::Init;
+        using NTvmApi::TThreadedUpdater::IsServiceContextOk;
+        using NTvmApi::TThreadedUpdater::IsTimeToUpdatePublicKeys;
+        using NTvmApi::TThreadedUpdater::IsTimeToUpdateServiceTickets;
+        using NTvmApi::TThreadedUpdater::IsUserContextOk;
+        using NTvmApi::TThreadedUpdater::ParseTicketsFromDisk;
+        using NTvmApi::TThreadedUpdater::ParseTicketsFromResponse;
+        using NTvmApi::TThreadedUpdater::PrepareRequestForServiceTickets;
+        using NTvmApi::TThreadedUpdater::PrepareTicketsForDisk;
+        using NTvmApi::TThreadedUpdater::SetServiceContext;
+        using NTvmApi::TThreadedUpdater::SetServiceTickets;
+        using NTvmApi::TThreadedUpdater::SetUserContext;
+        using NTvmApi::TThreadedUpdater::THttpResult;
+        using NTvmApi::TThreadedUpdater::TPairTicketsErrors;
+        using TAsyncUpdaterBase::IsServiceTicketMapOk;
+    };
+
+    Y_UNIT_TEST(IsCacheComplete_Empty) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"blackbox2", 20}});
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_Tickets) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"blackbox2", 20}});
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({{1, "mega_ticket"}}),
+            TServiceTickets::TMapIdStr({{2, "mega_error"}}),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(!u.AreServicesTicketsOk());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TServiceTickets::TMapIdStr({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServicesTicketsOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_Service) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.IsServiceContextOk());
+
+        u.SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(100500, NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+        UNIT_ASSERT(u.IsServiceContextOk());
+    }
+
+    Y_UNIT_TEST(IsCacheComplete_User) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+
+        TNotInitedUpdater u(s);
+        UNIT_ASSERT(!u.IsUserContextOk());
+
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(u.IsUserContextOk());
+    }
+
+    Y_UNIT_TEST(TicketsOnDisk) {
+        TString res = R"({
+            "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+            "213" : { "ticket" : "service_ticket_2"},
+            "234" : { "error" : "Dst is not found" },
+            "185" : { "ticket" : "service_ticket_3"},
+            "deprecated" : { "ticket" : "deprecated_ticket" }
+        })";
+        res.append("\t100500");
+
+        UNIT_ASSERT_VALUES_EQUAL(res, TNotInitedUpdater::PrepareTicketsForDisk(TVM_RESPONSE, 100500));
+
+        auto pair = TNotInitedUpdater::ParseTicketsFromDisk(res);
+        UNIT_ASSERT_VALUES_EQUAL(pair.first, TVM_RESPONSE);
+        UNIT_ASSERT_VALUES_EQUAL(pair.second, 100500);
+
+        res.push_back('a');
+        UNIT_ASSERT_EXCEPTION(TNotInitedUpdater::ParseTicketsFromDisk(res), yexception);
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdatePublicKeys) {
+        NTvmApi::TClientSettings s;
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+
+        TNotInitedUpdater u(s);
+
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now()));
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Hours(23)));
+        UNIT_ASSERT(u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Days(1) - TDuration::MilliSeconds(1)));
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdateServiceTickets) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}, {"blackbox2", 20}});
+
+        TNotInitedUpdater u(s);
+
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(TInstant::Now() - TDuration::Minutes(59)));
+        UNIT_ASSERT(u.IsTimeToUpdateServiceTickets(TInstant::Now() - TDuration::Hours(1) - TDuration::MilliSeconds(1)));
+    }
+
+    Y_UNIT_TEST(StartWithIncompliteCache) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", NTvmApi::TClientSettings::TDstVector({19, 20}));
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TOfflineUpdater(s, l, true),
+                                       TNonRetriableException,
+                                       "Failed to get ServiceTicket for 20: Missing tvm_id in response, should never happend: 20");
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from https://tvm-api.yandex.net\n"
+                << "7: Got responses with service tickets with 1 pages for 2 destination(s)\n"
+                << "3: Failed to get service ticket for dst=20: Missing tvm_id in response, should never happend: 20\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(PrepareRequestForServiceTickets) {
+        const TServiceContext ctx = TServiceContext::SigningFactory("AAAAAAAAAAAAAAAAAAAAAA");
+
+        TString s = TNotInitedUpdater::PrepareRequestForServiceTickets(117,
+                                                                       ctx,
+                                                                       {19, 20},
+                                                                       NUtils::TProcInfo{
+                                                                           "__some_pid__",
+                                                                           "__some_pname__",
+                                                                           "kar",
+                                                                       },
+                                                                       100700);
+        SubstGlobal(s.resize(s.size() - 5), "deb_", "");
+        UNIT_ASSERT_VALUES_EQUAL("grant_type=client_credentials&src=117&dst=19,20&ts=100700&sign=XTz2Obd6PII_BHxswzWPJTjju9SrKsN6hyu1VsyxBvU&get_retry_settings=yes&_pid=__some_pid__&_procces_name=__some_pname__&lib_version=client_kar",
+                                 s);
+
+        s = TNotInitedUpdater::PrepareRequestForServiceTickets(118,
+                                                               ctx,
+                                                               {19},
+                                                               NUtils::TProcInfo{
+                                                                   "__some_pid__",
+                                                                   {},
+                                                                   "kva_",
+                                                               },
+                                                               100900);
+        SubstGlobal(s.resize(s.size() - 5), "deb_", "");
+        UNIT_ASSERT_VALUES_EQUAL("grant_type=client_credentials&src=118&dst=19&ts=100900&sign=-trBo9AtBLjp2ihy6cFAdMAQ6S9afHj23rFzYQ32jkQ&get_retry_settings=yes&_pid=__some_pid__&lib_version=client_kva_",
+                                 s);
+    }
+
+    Y_UNIT_TEST(ParseTicketsFromResponse) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+
+        auto l = MakeIntrusive<TLogger>();
+        TNotInitedUpdater u(s, l);
+
+        TNotInitedUpdater::TPairTicketsErrors t;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseTicketsFromResponse("{", NTvmApi::TDstSet{19}, t),
+                                       yexception,
+                                       "Invalid json from tvm-api");
+
+        t = {};
+        u.ParseTicketsFromResponse(TVM_RESPONSE, NTvmApi::TDstSet{19}, t);
+
+        TNotInitedUpdater::TPairTicketsErrors expected{{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {}};
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+        UNIT_ASSERT_EQUAL(expected, t);
+
+        t = {};
+        u.ParseTicketsFromResponse(TVM_RESPONSE,
+                                   NTvmApi::TDstSet{19, 213, 234, 235},
+                                   t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([
+                {"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},"234" : { "error" : "Dst is not found" }},
+                {"213" : { "ticket" : "service_ticket_2"},"185" : { "ticket" : "service_ticket_3"}},
+                {"deprecated" : { "ticket" : "deprecated_ticket" }}
+            ])",
+            NTvmApi::TDstSet{19, 213, 234, 235},
+            t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseTicketsFromResponseAsArray) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+
+        auto l = MakeIntrusive<TLogger>();
+        TNotInitedUpdater u(s, l);
+
+        TNotInitedUpdater::TPairTicketsErrors t;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseTicketsFromResponse("[", NTvmApi::TDstSet{19}, t),
+                                       yexception,
+                                       "Invalid json from tvm-api");
+
+        u.ParseTicketsFromResponse(R"([])", NTvmApi::TDstSet{19}, t);
+        UNIT_ASSERT_VALUES_EQUAL("6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n",
+                                 l->Stream.Str());
+        TNotInitedUpdater::TPairTicketsErrors expected = {
+            {}, {{19, "Missing tvm_id in response, should never happend: 19"}}};
+        UNIT_ASSERT_VALUES_EQUAL(expected, t);
+        l->Stream.Clear();
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([{},{"19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {"213" : { "ticket" : "service_ticket_2"}}])",
+            NTvmApi::TDstSet{19},
+            t);
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}}, {}};
+        UNIT_ASSERT_EQUAL(expected, t);
+
+        t = {};
+        u.ParseTicketsFromResponse(
+            R"([{
+                    "19"  : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}
+                },
+                {
+                    "213" : { "ticket" : "service_ticket_2"},
+                    "234" : { "error" : "Dst is not found" }
+                },
+                {
+                    "185" : { "ticket" : "service_ticket_3"},
+                    "deprecated" : { "ticket" : "deprecated_ticket" }
+                }
+            ])",
+            NTvmApi::TDstSet{19, 213, 234, 235},
+            t);
+        expected = {{{19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                     {213, "service_ticket_2"}},
+                    {{234, "Dst is not found"},
+                     {235, "Missing tvm_id in response, should never happend: 235"}}};
+        UNIT_ASSERT_EQUAL(expected, t);
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+    }
+
+    class TReplier: public TRequestReplier {
+    public:
+        HttpCodes Code = HTTP_OK;
+
+        bool DoReply(const TReplyParams& params) override {
+            TParsedHttpFull fl(params.Input.FirstLine());
+
+            THttpResponse resp(Code);
+            if (fl.Path == "/2/keys") {
+                resp.SetContent(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+            } else if (fl.Path == "/2/ticket") {
+                resp.SetContent(TVM_RESPONSE);
+            } else {
+                UNIT_ASSERT(false);
+            }
+            resp.OutTo(params.Output);
+
+            return true;
+        }
+    };
+
+    class TOnlineUpdater: public NTvmApi::TThreadedUpdater {
+    public:
+        TOnlineUpdater(const NTvmApi::TClientSettings& settings, TIntrusivePtr<TLogger> l)
+            : NTvmApi::TThreadedUpdater(settings, l)
+        {
+            Init();
+            ExpBackoff_.SetEnabled(false);
+            StartWorker();
+        }
+    };
+
+    Y_UNIT_TEST(MocServerOk) {
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        NMock::TMockServer server(tvmPort, []() { return new TReplier; });
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+        s.SetTvmHostPort("http://localhost", tvmPort);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TOnlineUpdater u(s, l);
+            UNIT_ASSERT_VALUES_EQUAL_C(TClientStatus::Ok, u.GetStatus(), l->Stream.Str());
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Got responses with service tickets with 1 pages for 1 destination(s)\n"
+                << "6: Cache was updated with 1 service ticket(s): XXXXXXXXXXX\n"
+                << "7: Public keys were successfully fetched from http://localhost\n"
+                << "6: Cache was updated with public keys: XXXXXXXXXXX\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            std::regex_replace(std::string(l->Stream.Str()), TIME_REGEX, "XXXXXXXXXXX"));
+    }
+
+    Y_UNIT_TEST(MocServerBad) {
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        NMock::TMockServer server(tvmPort,
+                                  []() {
+                                      auto p = new TReplier;
+                                      p->Code = HTTP_BAD_REQUEST;
+                                      return p;
+                                  });
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", {{"blackbox", 19}});
+        s.EnableServiceTicketChecking();
+        s.EnableUserTicketChecking(EBlackboxEnv::Test);
+        s.SetTvmHostPort("localhost", tvmPort);
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS_C(TOnlineUpdater(s, l),
+                                         TNonRetriableException,
+                                         "Failed to start TvmClient. Do not retry: ServiceTickets: Path:/2/ticket.Code=400:",
+                                         l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(MocServerPaginated) {
+        class TReplier: public TRequestReplier {
+        public:
+            TString Response;
+            TReplier(TString response)
+                : Response(response)
+            {
+            }
+
+            bool DoReply(const TReplyParams& params) override {
+                TParsedHttpFull fl(params.Input.FirstLine());
+                if (fl.Path != "/2/ticket") {
+                    UNIT_ASSERT_C(false, fl.Path);
+                }
+
+                THttpResponse resp(HTTP_OK);
+                resp.SetContent(Response);
+                resp.OutTo(params.Output);
+                return true;
+            }
+        };
+
+        TPortManager pm;
+        ui16 tvmPort = pm.GetPort(80);
+        TVector<TString> responses = {
+            R"({"15" : { "ticket" : "service_ticket_3" },"19" : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})",
+            R"({"222" : { "ticket" : "service_ticket_2"}, "239" : { "error" : "Dst is not found" }})",
+            R"({"185" : { "ticket" : "service_ticket_3"}})",
+        };
+        NMock::TMockServer server(tvmPort, [&responses]() {
+            if (responses.empty()) {
+                return new TReplier("<NULL>");
+            }
+            TString r = responses.front();
+            responses.erase(responses.begin());
+            return new TReplier(r);
+        });
+
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketsFetchOptions("qwerty", NTvmApi::TClientSettings::TDstVector{19, 222, 239, 100500, 15});
+        s.SetTvmHostPort("http://localhost", tvmPort);
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TNotInitedUpdater u(s, l);
+            TNotInitedUpdater::THttpResult result = u.GetServiceTicketsFromHttp(NTvmApi::TDstSet{19, 222, 239, 100500, 15}, 2);
+            UNIT_ASSERT_VALUES_EQUAL(TSmallVec<TString>({
+                                         R"({"15" : { "ticket" : "service_ticket_3" },"19" : { "ticket" : "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}})",
+                                         R"({"222" : { "ticket" : "service_ticket_2"}, "239" : { "error" : "Dst is not found" }})",
+                                         R"({"185" : { "ticket" : "service_ticket_3"}})",
+                                     }),
+                                     result.Responses);
+            TNotInitedUpdater::TPairTicketsErrors expected{
+                {
+                    {19, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"},
+                    {222, "service_ticket_2"},
+                    {15, "service_ticket_3"},
+                },
+                {
+                    {239, "Dst is not found"},
+                    {100500, "Missing tvm_id in response, should never happend: 100500"},
+                },
+            };
+            UNIT_ASSERT_VALUES_EQUAL(expected, result.TicketsWithErrors);
+        }
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "6: Disk cache disabled. Please set disk cache directory in settings for best reliability\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Response with service tickets for 2 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Response with service tickets for 1 destination(s) was successfully fetched from http://localhost\n"
+                << "7: Got responses with service tickets with 3 pages for 5 destination(s)\n"
+                << "3: Failed to get service ticket for dst=100500: Missing tvm_id in response, should never happend: 100500\n"
+                << "3: Failed to get service ticket for dst=239: Dst is not found\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(FindMissingDsts) {
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts({1, 2, 3, 4}, {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(),
+                                 TNotInitedUpdater::FindMissingDsts({1, 2, 3, 4, 5, 6, 7, 8, 9}, {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({1, 4, 6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(NTvmApi::TDstSet(), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(1, 19),
+                                 TNotInitedUpdater::FindMissingDsts({213}, {19, 213}));
+
+        auto make = [](TVector<int> ids) {
+            TServiceTickets::TMapIdStr m;
+            for (auto i : ids) {
+                m.insert({i, ""});
+            }
+            return MakeIntrusiveConst<TServiceTickets>(std::move(m), TServiceTickets::TMapIdStr{}, TServiceTickets::TMapAliasId{});
+        };
+
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(make({1, 2, 3, 4}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(),
+                                 TNotInitedUpdater::FindMissingDsts(make({1, 2, 3, 4, 5, 6, 7, 8, 9}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector({1, 4, 6, 9}),
+                                 TNotInitedUpdater::FindMissingDsts(make({}), {1, 4, 6, 9}));
+        UNIT_ASSERT_VALUES_EQUAL(NTvmApi::TClientSettings::TDstVector(1, 19),
+                                 TNotInitedUpdater::FindMissingDsts(make({213}), {19, 213}));
+    }
+
+    Y_UNIT_TEST(CreateJsonArray) {
+        UNIT_ASSERT_VALUES_EQUAL("[]", TNotInitedUpdater::CreateJsonArray({}));
+        UNIT_ASSERT_VALUES_EQUAL("[sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+                                 TNotInitedUpdater::CreateJsonArray({"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL("[sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+                                 TNotInitedUpdater::CreateJsonArray({"sdlzkjvbsdljhfbsdajlhfbsakjdfb",
+                                                                     "o92q83yh2uhq2eri23r"}));
+    }
+
+    Y_UNIT_TEST(AppendArrayToJson) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNotInitedUpdater::AppendToJsonArray("", {}),
+                                       yexception,
+                                       "previous body required");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNotInitedUpdater::AppendToJsonArray("[kek", {}),
+                                       yexception,
+                                       "array is broken:");
+
+        UNIT_ASSERT_VALUES_EQUAL("[kek]", TNotInitedUpdater::AppendToJsonArray("kek", {}));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+            TNotInitedUpdater::AppendToJsonArray("kek",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+            TNotInitedUpdater::AppendToJsonArray("kek",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb", "o92q83yh2uhq2eri23r"}));
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb]",
+            TNotInitedUpdater::AppendToJsonArray("[kek]",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb"}));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "[kek,sdlzkjvbsdljhfbsdajlhfbsakjdfb,o92q83yh2uhq2eri23r]",
+            TNotInitedUpdater::AppendToJsonArray("[kek]",
+                                                 {"sdlzkjvbsdljhfbsdajlhfbsakjdfb", "o92q83yh2uhq2eri23r"}));
+    }
+
+    Y_UNIT_TEST(UpdaterTimeouts) {
+        NTvmApi::TClientSettings s;
+        s.SetSelfTvmId(100500);
+        s.EnableServiceTicketChecking();
+        s.TvmHost = "localhost";
+        s.TvmPort = GetRandomPort();
+        const auto timeout = TDuration::MilliSeconds(10);
+        s.TvmConnectTimeout = timeout;
+        s.TvmSocketTimeout = timeout;
+
+        {
+            auto l = MakeIntrusive<TLogger>();
+            auto startTs = ::Now();
+            UNIT_ASSERT_EXCEPTION(NTvmApi::TThreadedUpdater::Create(s, l), yexception);
+            UNIT_ASSERT_LT(::Now() - startTs, timeout * 2);
+        }
+    }
+}
+
+template <>
+void Out<TSmallVec<TString>>(IOutputStream& out, const TSmallVec<TString>& m) {
+    for (const TString& s : m) {
+        out << s << ";";
+    }
+}
+
+template <>
+void Out<TServiceTickets::TMapIdStr>(
+    IOutputStream& out,
+    const TServiceTickets::TMapIdStr& m) {
+    for (const auto& pair : m) {
+        out << pair.first << " -> " << pair.second << ";";
+    }
+}
+
+template <>
+void Out<NTestSuiteApiUpdater::TNotInitedUpdater::TPairTicketsErrors>(
+    IOutputStream& out,
+    const NTestSuiteApiUpdater::TNotInitedUpdater::TPairTicketsErrors& m) {
+    out << m.Tickets << "\n";
+    out << m.Errors << "\n";
+}
+
+template <>
+void Out<NTvmAuth::NTvmApi::TClientSettings::TDst>(IOutputStream& out, const NTvmAuth::NTvmApi::TClientSettings::TDst& m) {
+    out << m.Id;
+}
diff --git a/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp b/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp
new file mode 100644
index 00000000000..1295ed750e1
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/tvmtool_updater_ut.cpp
@@ -0,0 +1,744 @@
+#include "common.h"
+
+#include <library/cpp/tvmauth/client/facade.h>
+#include <library/cpp/tvmauth/client/misc/tool/threaded_updater.h>
+
+#include <library/cpp/http/simple/http_client.h>
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/system/env.h>
+
+using namespace NTvmAuth;
+using namespace NTvmAuth::NTvmTool;
+
+Y_UNIT_TEST_SUITE(ToolUpdater) {
+    static const TString SRV_TICKET = "3:serv:CBAQ__________9_IgYIexCUkQY:GioCM49Ob6_f80y6FY0XBVN4hLXuMlFeyMvIMiDuQnZkbkLpRpQOuQo5YjWoBjM0Vf-XqOm8B7xtrvxSYHDD7Q4OatN2l-Iwg7i71lE3scUeD36x47st3nd0OThvtjrFx_D8mw_c0GT5KcniZlqq1SjhLyAk1b_zJsx8viRAhCU";
+    static const TString SRV_TICKET_DST_100503 = "3:serv:CBAQ__________9_IggIwMQHEJeRBg:Kj7VApP6D91UJ8pKpeaE3vYaNTBBJcdYpJLbF9w2-Mb-75s_SmMKkPqqA2rMS358uFfoYpv9YZxq0tIaUj5HPQ1WaQ1yiVuPZ_oi3pJRdr006eRyihM8PUfl6m9ioCFftfOcAg9oN5BGeHTNhn7VWuj3yMg7feaMB0zAUpyaPG0";
+    static const TString TEST_TICKET = "3:user:CA0Q__________9_Gg4KAgh7EHsg0oXYzAQoAQ:FSADps3wNGm92Vyb1E9IVq5M6ZygdGdt1vafWWEhfDDeCLoVA-sJesxMl2pGW4OxJ8J1r_MfpG3ZoBk8rLVMHUFrPa6HheTbeXFAWl8quEniauXvKQe4VyrpA1SPgtRoFqi5upSDIJzEAe1YRJjq1EClQ_slMt8R0kA_JjKUX54";
+    static const TString PROD_YATEAM_TICKET = "3:user:CAwQ__________9_Gg4KAgh7EHsg0oXYzAQoAg:G2wloFRSi8--RLb2GDSro_sKXPF2JSdL5CVOuOHgUcRvLm-3OxIPn0NUqbJ9DWDmhPplOqEiblIbLK85My1VMJ2aG5SLbRNKEtwfmxLvkwNpl_gUEwWPJm9_8Khslfj71P3hccxtEEqM9bJSMwHueVAY-a9HSzFo-uMFMeSgQ-k";
+
+    class TMetaInfoProxy: public TMetaInfo {
+    public:
+        using TMetaInfo::ApplySettings;
+        using TMetaInfo::BbEnvFromString;
+        using TMetaInfo::Config_;
+        using TMetaInfo::Fetch;
+        using TMetaInfo::ParseMetaString;
+        using TMetaInfo::TMetaInfo;
+    };
+
+    Y_UNIT_TEST(Settings) {
+        NTvmTool::TClientSettings s("foo");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.SetAuthToken("\n "),
+                                       TBrokenTvmClientSettings,
+                                       "Auth token cannot be empty");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.GetAuthToken(),
+                                       TBrokenTvmClientSettings,
+                                       "Auth token cannot be empty. Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+
+        UNIT_ASSERT_NO_EXCEPTION(s.SetAuthToken(AUTH_TOKEN + "\n"));
+        UNIT_ASSERT_VALUES_EQUAL(AUTH_TOKEN, s.GetAuthToken());
+
+        UNIT_ASSERT_VALUES_EQUAL("localhost", s.GetHostname());
+        UNIT_ASSERT_EXCEPTION_CONTAINS(s.SetHostname(""),
+                                       TBrokenTvmClientSettings,
+                                       "Hostname cannot be empty");
+
+        UNIT_ASSERT_NO_EXCEPTION(s.SetHostname("qwe"));
+        UNIT_ASSERT_VALUES_EQUAL("qwe", s.GetHostname());
+    }
+
+    Y_UNIT_TEST(SettingsCtor) {
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NTvmTool::TClientSettings(""),
+                                       TBrokenTvmClientSettings,
+                                       "Alias for your TVM client cannot be empty");
+        {
+            NTvmTool::TClientSettings s("self");
+            UNIT_ASSERT_EXCEPTION_CONTAINS(s.GetAuthToken(),
+                                           TBrokenTvmClientSettings,
+                                           "Auth token cannot be empty. "
+                                           "Env 'TVMTOOL_LOCAL_AUTHTOKEN' and 'QLOUD_TVM_TOKEN' are empty.");
+        }
+
+        struct TEnvs {
+            TEnvs(const std::map<TString, TString>& Env) {
+                for (const auto& [key, value] : Env) {
+                    Prev[key] = GetEnv(key);
+                    SetEnv(key, value);
+                }
+            }
+
+            ~TEnvs() {
+                for (const auto& [key, value] : Prev) {
+                    SetEnv(key, value);
+                }
+            }
+
+            std::map<TString, TString> Prev;
+        };
+
+        struct TCase {
+            std::map<TString, TString> Env;
+            TString AuthToken;
+            ui16 Port = 0;
+        };
+
+        std::vector<TCase> cases = {
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"QLOUD_TVM_TOKEN", "zxcvbn"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"QLOUD_TVM_TOKEN", "zxcvbn"},
+                },
+                "zxcvbn",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "32272"},
+                },
+                "qwerty",
+                1,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "localhost:32272"},
+                },
+                "qwerty",
+                32272,
+            },
+            {
+                {
+                    {"TVMTOOL_LOCAL_AUTHTOKEN", "qwerty"},
+                    {"DEPLOY_TVM_TOOL_URL", "http://localhost:32272"},
+                },
+                "qwerty",
+                32272,
+            },
+        };
+
+        for (const TCase& c : cases) {
+            TEnvs envs(c.Env);
+
+            NTvmTool::TClientSettings s("self");
+            UNIT_ASSERT_VALUES_EQUAL(c.AuthToken, s.GetAuthToken());
+            UNIT_ASSERT_VALUES_EQUAL(c.Port, s.GetPort());
+        }
+    }
+
+    Y_UNIT_TEST(Meta_Fetch) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        TMetaInfoProxy m(nullptr);
+        NTvmTool::TClientSettings settings("me");
+        settings.SetAuthToken(AUTH_TOKEN);
+        m.ApplySettings(settings);
+
+        UNIT_ASSERT_VALUES_EQUAL(META, m.Fetch(client));
+
+        settings.SetAuthToken("qwerty");
+        m.ApplySettings(settings);
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TNonRetriableException,
+                                       "Failed to fetch meta from tvmtool: localhost:");
+
+        settings.SetAuthToken(AUTH_TOKEN);
+        m.ApplySettings(settings);
+        {
+            TKeepAliveHttpClient client("localhost", 0);
+            UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                           TRetriableException,
+                                           "Failed to fetch meta data from tvmtool: ");
+        }
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Code = HTTP_NOT_FOUND;
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TNonRetriableException,
+                                       "Library does not support so old tvmtool. You need tvmtool>=1.1.0");
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Code = HTTP_INTERNAL_SERVER_ERROR;
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Fetch(client),
+                                       TRetriableException,
+                                       "Failed to fetch meta from tvmtool: localhost:");
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_me) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "me"));
+        UNIT_ASSERT_VALUES_EQUAL(100500, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"bbox", 242}, {"pass_likers", 11}}), c->DstAliases);
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_pc) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "push-client"));
+        UNIT_ASSERT_VALUES_EQUAL(100501, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"pass_likers", 100502}}), c->DstAliases);
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_se) {
+        TMetaInfo::TConfigPtr c;
+        UNIT_ASSERT(c = TMetaInfoProxy::ParseMetaString(META, "something_else"));
+        UNIT_ASSERT_VALUES_EQUAL(100503, c->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, c->BbEnv);
+        UNIT_ASSERT(c->DstAliases.empty());
+    }
+
+    Y_UNIT_TEST(Meta_ParseMetaString_errors) {
+        TMetaInfoProxy m(nullptr);
+        UNIT_ASSERT(!m.ParseMetaString(META, "ololo"));
+
+        TString meta = "}";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = "{}";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = R"({"tenants" : {}})";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+        meta = R"({"tenants" : [{"self":{}}]})";
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.ParseMetaString(meta, "qqq"), yexception, meta);
+    }
+
+    Y_UNIT_TEST(Meta_BbEnvFromString) {
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Prod, TMetaInfoProxy::BbEnvFromString("Prod", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Test, TMetaInfoProxy::BbEnvFromString("Test", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::ProdYateam, TMetaInfoProxy::BbEnvFromString("ProdYaTeam", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::TestYateam, TMetaInfoProxy::BbEnvFromString("TestYaTeam", META));
+        UNIT_ASSERT_VALUES_EQUAL(EBlackboxEnv::Stress, TMetaInfoProxy::BbEnvFromString("Stress", META));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TMetaInfoProxy::BbEnvFromString("foo", META),
+                                       yexception,
+                                       "'bb_env'=='foo'");
+    }
+
+    Y_UNIT_TEST(Meta_ApplySettings) {
+        NTvmTool::TClientSettings s("foo");
+        s.SetAuthToken(AUTH_TOKEN);
+
+        TMetaInfoProxy m(nullptr);
+        m.ApplySettings(s);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TKeepAliveHttpClient::THeaders({{"Authorization", AUTH_TOKEN}}),
+            m.GetAuthHeader());
+    }
+
+    Y_UNIT_TEST(Meta_Init) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        auto l = MakeIntrusive<TLogger>();
+        TMetaInfo m(l);
+        UNIT_ASSERT_NO_EXCEPTION(m.Init(client, s));
+        UNIT_ASSERT_VALUES_EQUAL(100500, m.GetConfig()->SelfTvmId);
+        UNIT_ASSERT_EQUAL(EBlackboxEnv::ProdYateam, m.GetConfig()->BbEnv);
+        UNIT_ASSERT_EQUAL(TMetaInfo::TDstAliases({{"bbox", 242}, {"pass_likers", 11}}), m.GetConfig()->DstAliases);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuilder()
+                                     << "7: Meta info fetched from localhost:" << port << "\n"
+                                     << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]\n",
+                                 l->Stream.Str());
+        l->Stream.Clear();
+        UNIT_ASSERT_VALUES_EQUAL(
+            "/tvm/tickets?src=100500&dsts=11,242",
+            TMetaInfo::GetRequestForTickets(*m.GetConfig()));
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Meta = R"({
+        "bb_env" : "Prod",
+        "tenants" : [{
+                "self": {"alias" : "me", "client_id": 100500},
+                "dsts" : [{"alias" : "pass_likers","client_id": 11}]
+            }]
+        })";
+            return p; });
+        UNIT_ASSERT(m.TryUpdateConfig(client));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "6: Meta was updated. Old: (self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]). New: (self_tvm_id=100500, bb_env=Prod, dsts=[(pass_likers:11)])\n",
+            l->Stream.Str());
+        l->Stream.clear();
+
+        s = NTvmTool::TClientSettings("foo");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        TMetaInfo m2(l);
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m2.Init(client, s), TNonRetriableException, "Alias 'foo' not found in meta info");
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuilder()
+                                     << "7: Meta info fetched from localhost:" << port << "\n",
+                                 l->Stream.Str());
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TMetaInfo::GetRequestForTickets({}),
+                                       yexception,
+                                       "DstAliases.empty()");
+
+        server.SetGenerator([]() {
+            auto p = new TTvmTool;
+            p->Meta = "}";
+            return p; });
+        UNIT_ASSERT_EXCEPTION_CONTAINS(m.Init(client, s),
+                                       TNonRetriableException,
+                                       "Malformed json from tvmtool:");
+    }
+
+    class TNonInitedUpdater: public TThreadedUpdater {
+    public:
+        TNonInitedUpdater(const TString& host, ui16 port, TLoggerPtr logger)
+            : TThreadedUpdater(host, port, TDuration::Seconds(5), TDuration::Seconds(30), logger)
+        {
+        }
+
+        using TThreadedUpdater::ArePublicKeysOk;
+        using TThreadedUpdater::AreServiceTicketsOk;
+        using TThreadedUpdater::FetchPublicKeys;
+        using TThreadedUpdater::FetchServiceTickets;
+        using TThreadedUpdater::GetBirthTimeFromResponse;
+        using TThreadedUpdater::Init;
+        using TThreadedUpdater::IsTimeToUpdatePublicKeys;
+        using TThreadedUpdater::IsTimeToUpdateServiceTickets;
+        using TThreadedUpdater::LastVisitForConfig_;
+        using TThreadedUpdater::MetaInfo_;
+        using TThreadedUpdater::ParseFetchTicketsResponse;
+        using TThreadedUpdater::SetBbEnv;
+        using TThreadedUpdater::SetServiceContext;
+        using TThreadedUpdater::SetServiceTickets;
+        using TThreadedUpdater::SetUpdateTimeOfPublicKeys;
+        using TThreadedUpdater::SetUpdateTimeOfServiceTickets;
+        using TThreadedUpdater::SetUserContext;
+        using TThreadedUpdater::TPairTicketsErrors;
+        using TThreadedUpdater::UpdateKeys;
+        using TThreadedUpdater::UpdateServiceTickets;
+    };
+
+    Y_UNIT_TEST(GetBirthTimeFromResponse) {
+        THttpHeaders h;
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"),
+                                       yexception,
+                                       "Failed to fetch bithtime of ololo from tvmtool");
+
+        h.AddHeader(THttpInputHeader("X-Ya-Tvmtool-Data-Birthtime: qwe"));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"),
+                                       yexception,
+                                       "Bithtime of ololo from tvmtool must be unixtime. Got: qwe");
+
+        h.AddOrReplaceHeader(THttpInputHeader("X-Ya-Tvmtool-Data-Birthtime: 123"));
+        UNIT_ASSERT_VALUES_EQUAL(TInstant::Seconds(123), TNonInitedUpdater::GetBirthTimeFromResponse(h, "ololo"));
+    }
+
+    Y_UNIT_TEST(Fetch) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("localhost", port, l);
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        u.MetaInfo_.Init(client, s);
+        auto p = u.FetchPublicKeys();
+        UNIT_ASSERT_STRINGS_EQUAL(NUnittest::TVMKNIFE_PUBLIC_KEYS, p.first);
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, p.second);
+
+        auto p2 = u.FetchServiceTickets(*u.MetaInfo_.GetConfig());
+        UNIT_ASSERT_STRINGS_EQUAL(TICKETS_ME, p2.first);
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, p2.second);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(ParseFetchTicketsResponse) {
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("", 0, l);
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(u.ParseFetchTicketsResponse("}", {}),
+                                       yexception,
+                                       "Invalid json from tvmtool: }");
+
+        auto t = u.ParseFetchTicketsResponse(TICKETS_ME, {{"pass_likers", 11}, {"se", 2}});
+        auto expected = TNonInitedUpdater::TPairTicketsErrors{
+            {{11, "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8"}},
+            {
+                {2, "Missing tvm_id in response, should never happend: se"},
+            },
+        };
+        UNIT_ASSERT_VALUES_EQUAL(expected, t);
+
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "3: Failed to get ServiceTicket for se (2): Missing tvm_id in response, should never happend: se\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Update) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+        TKeepAliveHttpClient client("localhost", port);
+
+        auto l = MakeIntrusive<TLogger>();
+        TNonInitedUpdater u("localhost", port, l);
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        u.MetaInfo_.Init(client, s);
+
+        using TTickets = TServiceTickets::TMapAliasStr;
+        UNIT_ASSERT(!u.GetCachedServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, u.UpdateServiceTickets(*u.MetaInfo_.GetConfig()));
+        UNIT_ASSERT(u.GetCachedServiceTickets());
+        UNIT_ASSERT_VALUES_EQUAL(TInstant(), u.GetUpdateTimeOfServiceTickets());
+        UNIT_ASSERT_EQUAL(
+            TTickets({
+                {"bbox", "3:serv:CBAQ__________9_IgcIlJEGEPIB:N7luw0_rVmBosTTI130jwDbQd0-cMmqJeEl0ma4ZlIo_mHXjBzpOuMQ3A9YagbmOBOt8TZ_gzGvVSegWZkEeB24gM22acw0w-RcHaQKrzSOA5Zq8WLNIC8QUa4_WGTlAsb7R7eC4KTAGgouIquNAgMBdTuGOuZHnMLvZyLnOMKc"},
+                {"pass_likers", "3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8"},
+            }),
+            u.GetCachedServiceTickets()->TicketsByAlias);
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        UNIT_ASSERT(!u.GetCachedServiceContext());
+        UNIT_ASSERT(!u.GetCachedUserContext());
+        UNIT_ASSERT_VALUES_EQUAL(BIRTHTIME, u.UpdateKeys(*u.MetaInfo_.GetConfig()));
+        UNIT_ASSERT(u.GetCachedServiceContext());
+        UNIT_ASSERT(!u.GetCachedUserContext());
+        u.SetBbEnv(EBlackboxEnv::Test);
+        UNIT_ASSERT(u.GetCachedUserContext());
+        UNIT_ASSERT_VALUES_EQUAL("", l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT(u->GetCachedServiceTickets());
+            UNIT_ASSERT(u->GetCachedServiceContext());
+            UNIT_ASSERT(u->GetCachedUserContext());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+
+            NTvmAuth::TTvmClient c(u);
+            UNIT_ASSERT(c.CheckServiceTicket(SRV_TICKET));
+            UNIT_ASSERT(!c.CheckServiceTicket(SRV_TICKET_DST_100503));
+            UNIT_ASSERT(c.CheckUserTicket(PROD_YATEAM_TICKET));
+            UNIT_ASSERT_VALUES_EQUAL("3:serv:CBAQ__________9_IgYIlJEGEAs:T-apeMNWFc_vHPQ3iLaZv9NjG-hf5-i23O4AhRu1M68ryN3FU5qvyqTSSiPbtJdFP6EE41QQBzEs59dHn9DRkqQNwwKf1is00Oewwj2XKO0uHukuzd9XxZnro7MfjPswsjWufxX28rmJtlfSXwAtyKt8TI5yKJnMeBPQ0m5R3k8", c.GetServiceTicketFor("pass_likers"));
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+
+        {
+            NTvmTool::TClientSettings s("something_else");
+            s.SetAuthToken(AUTH_TOKEN);
+            s.SetPort(port);
+
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT(!u->GetCachedServiceTickets());
+            UNIT_ASSERT(u->GetCachedServiceContext());
+            UNIT_ASSERT(u->GetCachedUserContext());
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+
+            NTvmAuth::TTvmClient c(u);
+            UNIT_ASSERT(!c.CheckServiceTicket(SRV_TICKET));
+            UNIT_ASSERT(c.CheckServiceTicket(SRV_TICKET_DST_100503));
+            UNIT_ASSERT(c.CheckUserTicket(PROD_YATEAM_TICKET));
+            UNIT_ASSERT_EXCEPTION_CONTAINS(c.GetServiceTicketFor("pass_likers"),
+                                           TBrokenTvmClientSettings,
+                                           "Need to enable ServiceTickets fetching");
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100503, bb_env=ProdYateam, dsts=[]\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+        l->Stream.Clear();
+    }
+
+    Y_UNIT_TEST(IsOk) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+        using TTickets = TServiceTickets::TMapIdStr;
+
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(TTickets(),
+                                                                TTickets(),
+                                                                TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TTickets({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TTickets({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId()));
+        UNIT_ASSERT(u.AreServiceTicketsOk(0));
+        UNIT_ASSERT(!u.AreServiceTicketsOk(2));
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TTickets({
+                {1, "mega_ticket"},
+                {2, "mega_ticket2"},
+            }),
+            TTickets({
+                {3, "mega_error3"},
+            }),
+            TServiceTickets::TMapAliasId({
+                {"mega_ticket", 1},
+                {"mega_ticket2", 2},
+                {"mega_ticket3", 3},
+            })));
+        UNIT_ASSERT(u.AreServiceTicketsOk(2));
+
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetServiceContext(MakeIntrusiveConst<TServiceContext>(
+            TServiceContext::CheckingFactory(12, NUnittest::TVMKNIFE_PUBLIC_KEYS)));
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetUserContext(NUnittest::TVMKNIFE_PUBLIC_KEYS);
+        UNIT_ASSERT(!u.ArePublicKeysOk());
+        u.SetBbEnv(EBlackboxEnv::Test);
+        UNIT_ASSERT(u.ArePublicKeysOk());
+    }
+
+    Y_UNIT_TEST(IsTimeToUpdate) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+
+        UNIT_ASSERT(!u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(u.IsTimeToUpdatePublicKeys(TInstant::Now() - TDuration::Seconds(603)));
+
+        TMetaInfo::TConfig cfg;
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(603)));
+
+        cfg.DstAliases = {{"q", 1}};
+        UNIT_ASSERT(!u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(597)));
+        UNIT_ASSERT(u.IsTimeToUpdateServiceTickets(cfg, TInstant::Now() - TDuration::Seconds(603)));
+    }
+
+    Y_UNIT_TEST(InitWithOldData) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port,
+                                  []() {
+                                      auto p = new TTvmTool;
+                                      p->Birthtime = TInstant::Seconds(123);
+                                      return p;
+                                  });
+
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100500, bb_env=ProdYateam, dsts=[(pass_likers:11)(bbox:242)]\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of tickets: Service tickets are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Service tickets have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(InitWithOldData_onlyKeys) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port,
+                                  []() {
+                                      auto p = new TTvmTool;
+                                      p->Birthtime = TInstant::Seconds(123);
+                                      return p;
+                                  });
+
+        NTvmTool::TClientSettings s("something_else");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+
+        {
+            s.OverrideBlackboxEnv(EBlackboxEnv::Stress);
+            auto l = MakeIntrusive<TLogger>();
+            UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                           TBrokenTvmClientSettings,
+                                           "Overriding of BlackboxEnv is illegal: ProdYateam -> Stress");
+        }
+
+        s.OverrideBlackboxEnv(EBlackboxEnv::Prod);
+        auto l = MakeIntrusive<TLogger>();
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, l),
+                                       TRetriableException,
+                                       "Failed to start TvmClient. You can retry: ");
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100503, bb_env=ProdYateam, dsts=[]\n"
+                << "6: Meta: override blackbox env: ProdYateam->Prod\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n"
+                << "4: Error while fetching of public keys: Public keys are too old: 1970-01-01T00:02:03.000000Z\n"
+                << "3: Public keys have not been refreshed for too long period\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(Init) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("push-client");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        s.SetHostname("localhost");
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100501, bb_env=ProdYateam, dsts=[(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+
+    Y_UNIT_TEST(InitWithoutTvmtool) {
+        NTvmTool::TClientSettings s("me");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(0);
+
+        UNIT_ASSERT_EXCEPTION_CONTAINS(TThreadedUpdater::Create(s, TDevNullLogger::IAmBrave()),
+                                       TNonRetriableException,
+                                       "can not connect to ");
+    }
+
+    Y_UNIT_TEST(GetStatus) {
+        TNonInitedUpdater u("", 0, TDevNullLogger::IAmBrave());
+        TMetaInfoProxy m(nullptr);
+        m.Config_ = std::make_shared<TMetaInfo::TConfig>();
+        u.MetaInfo_ = m;
+        u.LastVisitForConfig_ = TInstant::Now();
+
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+        u.SetUpdateTimeOfPublicKeys(TInstant::Now() - TDuration::Days(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+        u.SetUpdateTimeOfPublicKeys(TInstant::Now() - TDuration::Hours(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+
+        u.SetServiceTickets(new TServiceTickets({}, {}, {}));
+
+        TMetaInfo::TConfig cfg;
+        cfg.DstAliases = {{"q", 1}, {"q2", 2}};
+        m.Config_ = std::make_shared<TMetaInfo::TConfig>(cfg);
+        u.MetaInfo_ = m;
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+        u.SetUpdateTimeOfServiceTickets(TInstant::Now() - TDuration::Hours(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Error, u.GetStatus());
+
+        u.SetServiceTickets(MakeIntrusiveConst<TServiceTickets>(
+            TServiceTickets::TMapIdStr({{1, "3:serv:CBAQ__________9_IgYIKhCUkQY:CX"}, {2, "t"}}),
+            TServiceTickets::TMapIdStr({{3, "mega_error"}, {4, "error2"}}),
+            TServiceTickets::TMapAliasId({
+                {"some_alias#1", 1},
+                {"some_alias#2", 2},
+            })));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+
+        const TInstant* inv = &u.GetCachedServiceTickets()->InvalidationTime;
+        *const_cast<TInstant*>(inv) = TInstant::Now() + TDuration::Hours(3);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+
+        u.SetUpdateTimeOfServiceTickets(TInstant::Now() - TDuration::Minutes(3));
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u.GetStatus());
+
+        u.LastVisitForConfig_ = TInstant::Now() - TDuration::Minutes(1);
+        UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Warning, u.GetStatus());
+    }
+
+    Y_UNIT_TEST(multiNamesForDst) {
+        TPortManager pm;
+        ui16 port = pm.GetPort(80);
+        NMock::TMockServer server(port, []() { return new TTvmTool; });
+
+        NTvmTool::TClientSettings s("multi_names_for_dst");
+        s.SetAuthToken(AUTH_TOKEN);
+        s.SetPort(port);
+        s.SetHostname("localhost");
+
+        auto l = MakeIntrusive<TLogger>();
+        {
+            TAsyncUpdaterPtr u = TThreadedUpdater::Create(s, l);
+            UNIT_ASSERT_VALUES_EQUAL(TClientStatus::Ok, u->GetStatus());
+        }
+        UNIT_ASSERT_VALUES_EQUAL(
+            TStringBuilder()
+                << "7: Meta info fetched from localhost:" << port << "\n"
+                << "6: Meta: self_tvm_id=100599, bb_env=ProdYateam, dsts=[(pass_haters:100502)(pass_likers:100502)]\n"
+                << "7: Tickets fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Public keys fetched from tvmtool: 2425-09-17T11:04:00.000000Z\n"
+                << "7: Thread-worker started\n"
+                << "7: Thread-worker stopped\n",
+            l->Stream.Str());
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/utils_ut.cpp b/library/cpp/tvmauth/client/ut/utils_ut.cpp
new file mode 100644
index 00000000000..e780fb27791
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/utils_ut.cpp
@@ -0,0 +1,88 @@
+#include <library/cpp/tvmauth/client/misc/utils.h>
+
+#include <library/cpp/testing/unittest/registar.h>
+
+Y_UNIT_TEST_SUITE(UtilsTest) {
+    using namespace NTvmAuth;
+
+    Y_UNIT_TEST(ParseDstMap) {
+        using TMap = NTvmAuth::NTvmApi::TClientSettings::TDstMap;
+        UNIT_ASSERT_EQUAL(TMap(), NUtils::ParseDstMap(""));
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap(";"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap(":"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap("3;"), TFromStringException);
+        UNIT_ASSERT_EXCEPTION(NUtils::ParseDstMap("3:foo;"), TFromStringException);
+
+        UNIT_ASSERT_EQUAL(TMap({
+                              {"foo", 3},
+                          }),
+                          NUtils::ParseDstMap("foo:3"));
+        UNIT_ASSERT_EQUAL(TMap({
+                              {"foo", 3},
+                              {"bar", 17},
+                          }),
+                          NUtils::ParseDstMap("foo:3;bar:17;"));
+    }
+
+    Y_UNIT_TEST(ParseDstVector) {
+        using TVector = NTvmAuth::NTvmApi::TClientSettings::TDstVector;
+        UNIT_ASSERT_EQUAL(TVector(), NUtils::ParseDstVector(""));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector(";"),
+                                       yexception,
+                                       "Cannot parse empty string as number");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector(":"),
+                                       yexception,
+                                       "Unexpected symbol");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector("3:foo;"),
+                                       yexception,
+                                       "Unexpected symbol");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(NUtils::ParseDstVector("foo:3;"),
+                                       yexception,
+                                       "Unexpected symbol");
+
+        UNIT_ASSERT_EQUAL(TVector(1, 3),
+                          NUtils::ParseDstVector("3"));
+        UNIT_ASSERT_EQUAL(TVector({3, 17}),
+                          NUtils::ParseDstVector("3;17;"));
+    }
+
+    Y_UNIT_TEST(ToHex) {
+        UNIT_ASSERT_VALUES_EQUAL("", NUtils::ToHex(""));
+        UNIT_ASSERT_VALUES_EQUAL("61", NUtils::ToHex("a"));
+        UNIT_ASSERT_VALUES_EQUAL(
+            "6C6B787A6E7620736C6A6876627761656220",
+            NUtils::ToHex("lkxznv sljhvbwaeb "));
+    }
+
+    Y_UNIT_TEST(CheckBbEnvOverriding) {
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Prod, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::ProdYateam, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Prod));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Test));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Test, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Prod));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Test));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::TestYateam, EBlackboxEnv::Stress));
+
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Prod));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::ProdYateam));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Test));
+        UNIT_ASSERT(!NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::TestYateam));
+        UNIT_ASSERT(NUtils::CheckBbEnvOverriding(EBlackboxEnv::Stress, EBlackboxEnv::Stress));
+    }
+}
diff --git a/library/cpp/tvmauth/client/ut/ya.make b/library/cpp/tvmauth/client/ut/ya.make
new file mode 100644
index 00000000000..e2686cd8d73
--- /dev/null
+++ b/library/cpp/tvmauth/client/ut/ya.make
@@ -0,0 +1,36 @@
+UNITTEST_FOR(library/cpp/tvmauth/client)
+
+OWNER(g:passport_infra)
+
+DATA(arcadia/library/cpp/tvmauth/client/ut/files)
+
+PEERDIR(
+    library/cpp/cgiparam
+    library/cpp/testing/mock_server
+)
+
+SRCS(
+    async_updater_ut.cpp
+    checker_ut.cpp
+    client_status_ut.cpp
+    default_uid_checker_ut.cpp
+    disk_cache_ut.cpp
+    exponential_backoff_ut.cpp
+    facade_ut.cpp
+    last_error_ut.cpp
+    logger_ut.cpp
+    roles/decoder_ut.cpp
+    roles/entities_index_ut.cpp
+    roles/parser_ut.cpp
+    roles/roles_ut.cpp
+    roles/tvmapi_roles_fetcher_ut.cpp
+    settings_ut.cpp
+    src_checker_ut.cpp
+    tvmapi_updater_ut.cpp
+    tvmtool_updater_ut.cpp
+    utils_ut.cpp
+)
+
+REQUIREMENTS(ram:11)
+
+END()
diff --git a/library/cpp/tvmauth/client/ya.make b/library/cpp/tvmauth/client/ya.make
new file mode 100644
index 00000000000..8ac4e56e010
--- /dev/null
+++ b/library/cpp/tvmauth/client/ya.make
@@ -0,0 +1,49 @@
+LIBRARY()
+
+OWNER(g:passport_infra)
+
+PEERDIR(
+    library/cpp/http/simple
+    library/cpp/json
+    library/cpp/openssl/crypto
+    library/cpp/streams/brotli
+    library/cpp/streams/zstd
+    library/cpp/string_utils/quote
+    library/cpp/tvmauth
+    library/cpp/tvmauth/client/misc/retry_settings/v1
+)
+
+SRCS(
+    client_status.cpp
+    facade.cpp
+    logger.cpp
+    misc/api/roles_fetcher.cpp
+    misc/api/settings.cpp
+    misc/api/threaded_updater.cpp
+    misc/async_updater.cpp
+    misc/disk_cache.cpp
+    misc/last_error.cpp
+    misc/proc_info.cpp
+    misc/roles/decoder.cpp
+    misc/roles/entities_index.cpp
+    misc/roles/parser.cpp
+    misc/roles/roles.cpp
+    misc/threaded_updater.cpp
+    misc/tool/meta_info.cpp
+    misc/tool/settings.cpp
+    misc/tool/threaded_updater.cpp
+    misc/utils.cpp
+    mocked_updater.cpp
+)
+
+GENERATE_ENUM_SERIALIZATION(client_status.h)
+GENERATE_ENUM_SERIALIZATION(misc/async_updater.h)
+GENERATE_ENUM_SERIALIZATION(misc/last_error.h)
+
+END()
+
+RECURSE_FOR_TESTS(
+    examples
+    misc/api/dynamic_dst
+    ut
+)
author	Devtools Arcadia <arcadia-devtools@yandex-team.ru>	2022-02-07 18:08:42 +0300
committer	Devtools Arcadia <arcadia-devtools@mous.vla.yp-c.yandex.net>	2022-02-07 18:08:42 +0300
commit	1110808a9d39d4b808aef724c861a2e1a38d2a69 (patch)
tree	e26c9fed0de5d9873cce7e00bc214573dc2195b7 /library/cpp/tvmauth/client
download	ydb-1110808a9d39d4b808aef724c861a2e1a38d2a69.tar.gz