Create broker actor which gives permission for interconnect handshakes,

Create broker actor which gives permission for interconnect handshakes

3 files changed, 140 insertions, 28 deletions

diff --git a/library/cpp/actors/interconnect/events_local.h b/library/cpp/actors/interconnect/events_local.h
index 7edb444346..80ab671f28 100644
--- a/library/cpp/actors/interconnect/events_local.h
+++ b/library/cpp/actors/interconnect/events_local.h
@@ -52,6 +52,9 @@ namespace NActors {
         EvProcessPingRequest,
         EvGetSecureSocket,
         EvSecureSocket,
+        HandshakeBrokerTake,
+        HandshakeBrokerFree,
+        HandshakeBrokerPermit,
 
         ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
         // nonlocal messages; their indices must be preserved in order to work properly while doing rolling update
@@ -98,6 +101,18 @@ namespace NActors {
         }
     };
 
+    struct TEvHandshakeBrokerTake: public TEventLocal<TEvHandshakeBrokerTake, ui32(ENetwork::HandshakeBrokerTake)> {
+        DEFINE_SIMPLE_LOCAL_EVENT(TEvHandshakeBrokerTake, "Network: TEvHandshakeBrokerTake")
+    };
+
+    struct TEvHandshakeBrokerFree: public TEventLocal<TEvHandshakeBrokerFree, ui32(ENetwork::HandshakeBrokerFree)> {
+        DEFINE_SIMPLE_LOCAL_EVENT(TEvHandshakeBrokerFree, "Network: TEvHandshakeBrokerFree")
+    };
+
+    struct TEvHandshakeBrokerPermit: public TEventLocal<TEvHandshakeBrokerPermit, ui32(ENetwork::HandshakeBrokerPermit)> {
+        DEFINE_SIMPLE_LOCAL_EVENT(TEvHandshakeBrokerPermit, "Network: TEvHandshakeBrokerPermit")
+    };
+
     struct TEvHandshakeAsk: public TEventLocal<TEvHandshakeAsk, ui32(ENetwork::HandshakeAsk)> {
         DEFINE_SIMPLE_LOCAL_EVENT(TEvHandshakeAsk, "Network: TEvHandshakeAsk")
         TEvHandshakeAsk(const TActorId& self,
diff --git a/library/cpp/actors/interconnect/handshake_broker.h b/library/cpp/actors/interconnect/handshake_broker.h
new file mode 100644
index 0000000000..2c1ba01390
--- /dev/null
+++ b/library/cpp/actors/interconnect/handshake_broker.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#include <library/cpp/actors/core/actor.h>
+
+#include <deque>
+
+namespace NActors {
+    static constexpr ui32 DEFAULT_INFLIGHT = 100;
+
+    class THandshakeBroker : public TActor<THandshakeBroker> {
+    private:
+        std::deque<TActorId> Waiting;
+        ui32 Capacity;
+
+        void Handle(TEvHandshakeBrokerTake::TPtr &ev) {
+            if (Capacity > 0) {
+                Capacity -= 1;
+                Send(ev->Sender, new TEvHandshakeBrokerPermit());
+            } else {
+                Waiting.push_back(ev->Sender);
+            }
+        }
+
+        void Handle(TEvHandshakeBrokerFree::TPtr& ev) {
+            Y_UNUSED(ev);
+            if (Capacity == 0 && !Waiting.empty()) {
+                Send(Waiting.front(), new TEvHandshakeBrokerPermit());
+                Waiting.pop_front();
+            } else {
+                Capacity += 1;
+            }
+        }
+
+        void PassAway() override {
+            while (!Waiting.empty()) {
+                Send(Waiting.front(), new TEvHandshakeBrokerPermit());
+                Waiting.pop_front();
+            }
+            TActor::PassAway();
+        }
+
+    public:
+        THandshakeBroker(ui32 inflightLimit = DEFAULT_INFLIGHT)
+            : TActor(&TThis::StateFunc)
+            , Capacity(inflightLimit) 
+        {
+        }
+
+        STFUNC(StateFunc) {
+            Y_UNUSED(ctx);
+            switch(ev->GetTypeRewrite()) {
+                hFunc(TEvHandshakeBrokerTake, Handle);
+                hFunc(TEvHandshakeBrokerFree, Handle);
+                cFunc(TEvents::TSystem::Poison, PassAway);
+            }
+        }
+
+        void Bootstrap() {
+            Become(&TThis::StateFunc);
+        };
+    };
+
+    inline IActor* CreateHandshakeBroker() {
+        return new THandshakeBroker();
+    }
+
+    inline TActorId MakeHandshakeBrokerOutId() {
+        char x[12] = {'I', 'C', 'H', 's', 'h', 'k', 'B', 'r', 'k', 'O', 'u', 't'};
+        return TActorId(0, TStringBuf(std::begin(x), std::end(x)));
+    }
+
+    inline TActorId MakeHandshakeBrokerInId() {
+        char x[12] = {'I', 'C', 'H', 's', 'h', 'k', 'B', 'r', 'k', 'r', 'I', 'n'};
+        return TActorId(0, TStringBuf(std::begin(x), std::end(x)));
+    }
+};
diff --git a/library/cpp/actors/interconnect/interconnect_handshake.cpp b/library/cpp/actors/interconnect/interconnect_handshake.cpp
index d7f657299e..4c1a95d31f 100644
--- a/library/cpp/actors/interconnect/interconnect_handshake.cpp
+++ b/library/cpp/actors/interconnect/interconnect_handshake.cpp
@@ -1,4 +1,5 @@
 #include "interconnect_handshake.h"
+#include "handshake_broker.h"
 #include "interconnect_tcp_proxy.h"
 
 #include <library/cpp/actors/core/actor_coroutine.h>
@@ -96,6 +97,7 @@ namespace NActors {
         THashMap<ui32, TInstant> LastLogNotice;
         const TDuration MuteDuration = TDuration::Seconds(15);
         TInstant Deadline;
+        TActorId HandshakeBroker;
 
     public:
         static constexpr IActor::EActivityType ActorActivityType() {
@@ -117,6 +119,7 @@ namespace NActors {
             Y_VERIFY(SelfVirtualId);
             Y_VERIFY(SelfVirtualId.NodeId());
             Y_VERIFY(PeerNodeId);
+            HandshakeBroker = MakeHandshakeBrokerOutId();
         }
 
         THandshakeActor(TInterconnectProxyCommon::TPtr common, TSocketPtr socket)
@@ -132,6 +135,7 @@ namespace NActors {
             } else {
                 PeerAddr.clear();
             }
+            HandshakeBroker = MakeHandshakeBrokerInId();
         }
 
         void UpdatePrefix() {
@@ -141,45 +145,62 @@ namespace NActors {
         void Run() override {
             UpdatePrefix();
 
-            // set up overall handshake process timer
-            TDuration timeout = Common->Settings.Handshake;
-            if (timeout == TDuration::Zero()) {
-                timeout = DEFAULT_HANDSHAKE_TIMEOUT;
+            bool isBrokerActive = false;
+
+            if (Send(HandshakeBroker, new TEvHandshakeBrokerTake())) {
+                isBrokerActive = true;
+                WaitForSpecificEvent<TEvHandshakeBrokerPermit>("HandshakeBrokerPermit");
             }
-            timeout += ResolveTimeout * 2;
-            Deadline = Now() + timeout;
-            Schedule(Deadline, new TEvents::TEvWakeup);
 
             try {
-                if (Socket) {
-                    PerformIncomingHandshake();
-                } else {
-                    PerformOutgoingHandshake();
+                // set up overall handshake process timer
+                TDuration timeout = Common->Settings.Handshake;
+                if (timeout == TDuration::Zero()) {
+                    timeout = DEFAULT_HANDSHAKE_TIMEOUT;
                 }
+                timeout += ResolveTimeout * 2;
+                Deadline = Now() + timeout;
+                Schedule(Deadline, new TEvents::TEvWakeup);
+
+                try {
+                    if (Socket) {
+                        PerformIncomingHandshake();
+                    } else {
+                        PerformOutgoingHandshake();
+                    }
 
-                // establish encrypted channel, or, in case when encryption is disabled, check if it matches settings
-                if (ProgramInfo) {
-                    if (Params.Encryption) {
-                        EstablishSecureConnection();
-                    } else if (Common->Settings.EncryptionMode == EEncryptionMode::REQUIRED && !Params.AuthOnly) {
-                        Fail(TEvHandshakeFail::HANDSHAKE_FAIL_PERMANENT, "Peer doesn't support encryption, which is required");
+                    // establish encrypted channel, or, in case when encryption is disabled, check if it matches settings
+                    if (ProgramInfo) {
+                        if (Params.Encryption) {
+                            EstablishSecureConnection();
+                        } else if (Common->Settings.EncryptionMode == EEncryptionMode::REQUIRED && !Params.AuthOnly) {
+                            Fail(TEvHandshakeFail::HANDSHAKE_FAIL_PERMANENT, "Peer doesn't support encryption, which is required");
+                        }
                     }
+                } catch (const TExHandshakeFailed&) {
+                    ProgramInfo.Clear();
                 }
-            } catch (const TExHandshakeFailed&) {
-                ProgramInfo.Clear();
-            }
 
-            if (ProgramInfo) {
-                LOG_LOG_IC_X(NActorsServices::INTERCONNECT, "ICH04", NLog::PRI_INFO, "handshake succeeded");
-                Y_VERIFY(NextPacketFromPeer);
-                if (PollerToken) {
-                    Y_VERIFY(PollerToken->RefCount() == 1);
-                    PollerToken.Reset(); // ensure we are going to destroy poller token here as we will re-register the socket within other actor
+                if (ProgramInfo) {
+                    LOG_LOG_IC_X(NActorsServices::INTERCONNECT, "ICH04", NLog::PRI_INFO, "handshake succeeded");
+                    Y_VERIFY(NextPacketFromPeer);
+                    if (PollerToken) {
+                        Y_VERIFY(PollerToken->RefCount() == 1);
+                        PollerToken.Reset(); // ensure we are going to destroy poller token here as we will re-register the socket within other actor
+                    }
+                    SendToProxy(MakeHolder<TEvHandshakeDone>(std::move(Socket), PeerVirtualId, SelfVirtualId,
+                        *NextPacketFromPeer, ProgramInfo->Release(), std::move(Params)));
                 }
-                SendToProxy(MakeHolder<TEvHandshakeDone>(std::move(Socket), PeerVirtualId, SelfVirtualId,
-                    *NextPacketFromPeer, ProgramInfo->Release(), std::move(Params)));
+            } catch(...) {
+                if (isBrokerActive) {
+                    Send(HandshakeBroker, new TEvHandshakeBrokerFree());
+                }
+                throw;
             }
 
+            if (isBrokerActive) {
+                Send(HandshakeBroker, new TEvHandshakeBrokerFree());
+            }
             Socket.Reset();
         }