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#pragma once
#include <ydb/library/actors/core/actor.h>
#include <ydb/library/actors/core/actor_bootstrapped.h>
#include <ydb/library/actors/core/hfunc.h>
#include <ydb/core/base/appdata.h>
#include <ydb/core/base/counters.h>
#include <ydb/core/base/feature_flags.h>
#include <ydb/core/base/domain.h>
#include <ydb/core/base/statestorage.h>
#include <ydb/core/health_check/health_check.h>
#include <ydb/core/protos/db_metadata_cache.pb.h>
#include <algorithm>
namespace NKikimr {
inline TString MakeDatabaseMetadataCacheBoardPath(const TString& database) {
return "metadatacache+" + database;
}
class TDatabaseMetadataCache : public TActorBootstrapped<TDatabaseMetadataCache> {
public:
enum EEv {
EvRefreshCache = EventSpaceBegin(TKikimrEvents::ES_DB_METADATA_CACHE),
EvEnd
};
static_assert(EvEnd < EventSpaceEnd(TKikimrEvents::ES_DB_METADATA_CACHE),
"expect EvEnd < EventSpaceEnd(TKikimrEvents::ES_DB_METADATA_CACHE)");
struct TEvRefreshCache : TEventLocal<TEvRefreshCache, EvRefreshCache> {};
using TBoardInfoEntries = TMap<TActorId, TEvStateStorage::TBoardInfoEntry>;
private:
static constexpr TDuration TIMEOUT = TDuration::Seconds(15);
const TString Path;
const TString BoardPath;
ui32 ActiveNode;
std::optional<Ydb::Monitoring::SelfCheckResult> Result;
TInstant LastResultUpdate;
std::vector<TActorId> Clients;
TBoardInfoEntries BoardInfo;
TActorId PublishActor;
TActorId SubscribeActor;
bool RequestInProgress = false;
::NMonitoring::TDynamicCounterPtr Counters;
static const inline TString HEALTHCHECK_REQUESTS_MADE_COUNTER = "DbMetadataCache/HealthCheckRequestsMade";
static const inline TString HEALTHCHECK_REQUESTS_ANSWERED_COUNTER = "DbMetadataCache/HealthCheckRequestsAnswered";
void SendRequest() {
if (RequestInProgress) {
return;
}
RequestInProgress = true;
auto request = std::make_unique<NHealthCheck::TEvSelfCheckRequest>();
request->Database = Path;
request->Request.set_return_verbose_status(true);
Send(NHealthCheck::MakeHealthCheckID(), request.release());
Counters->GetCounter(HEALTHCHECK_REQUESTS_MADE_COUNTER, true)->Inc();
}
void Reply(TActorId client) {
auto response = std::make_unique<NHealthCheck::TEvSelfCheckResultProto>();
response->Record = *Result;
Send(client, response.release());
Counters->GetCounter(HEALTHCHECK_REQUESTS_ANSWERED_COUNTER, true)->Inc();
}
void RefreshCache() {
SendRequest();
Schedule(TIMEOUT, new TEvRefreshCache());
}
void UpdateActiveNode() {
ActiveNode = PickActiveNode(BoardInfo);
LOG_DEBUG_S(TActivationContext::AsActorContext(), NKikimrServices::DB_METADATA_CACHE, "Active node is " << ActiveNode);
bool areWeActive = (ActiveNode == SelfId().NodeId());
if (areWeActive && CurrentStateFunc() != &TThis::StateActive) {
RefreshCache();
Become(&TThis::StateActive);
} else if (!areWeActive && CurrentStateFunc() != &TThis::StateInactive) {
Become(&TThis::StateInactive);
}
}
void SubscribeToBoard() {
auto domainInfo = AppData()->DomainsInfo->Domains.begin()->second;
SubscribeActor = RegisterWithSameMailbox(CreateBoardLookupActor(BoardPath,
SelfId(),
domainInfo->DefaultStateStorageGroup,
EBoardLookupMode::Subscription));
}
void Handle(TEvStateStorage::TEvBoardInfo::TPtr& ev) {
if (ev->Get()->Status != TEvStateStorage::TEvBoardInfo::EStatus::Ok) {
SubscribeToBoard();
return;
}
BoardInfo = std::move(ev->Get()->InfoEntries);
UpdateActiveNode();
}
void Handle(TEvStateStorage::TEvBoardInfoUpdate::TPtr& ev) {
if (ev->Get()->Status != TEvStateStorage::TEvBoardInfo::EStatus::Ok) {
SubscribeToBoard();
return;
}
auto& updates = ev->Get()->Updates;
for (auto& [actor, update] : updates) {
if (update.Dropped) {
BoardInfo.erase(actor);
} else {
BoardInfo.insert_or_assign(actor, std::move(update));
}
}
UpdateActiveNode();
}
void Handle(NHealthCheck::TEvSelfCheckResult::TPtr& ev) {
RequestInProgress = false;
Result = ev->Get()->Result;
LastResultUpdate = TActivationContext::Now();
for (const auto& client : Clients) {
Reply(client);
}
Clients.clear();
}
void Handle(NHealthCheck::TEvSelfCheckRequestProto::TPtr& ev) {
LOG_DEBUG_S(TActivationContext::AsActorContext(), NKikimrServices::DB_METADATA_CACHE, "Got request");
TInstant now = TActivationContext::Now();
if (Result && now - LastResultUpdate <= 2 * TIMEOUT) {
LOG_DEBUG_S(TActivationContext::AsActorContext(), NKikimrServices::DB_METADATA_CACHE, "Replying now");
Reply(ev->Sender);
} else {
LOG_DEBUG_S(TActivationContext::AsActorContext(), NKikimrServices::DB_METADATA_CACHE, "Answer not ready, waiting");
SendRequest();
Clients.push_back(ev->Sender);
}
}
public:
TDatabaseMetadataCache(const TString& path,
const ::NMonitoring::TDynamicCounterPtr& counters) : Path(path)
, BoardPath(MakeDatabaseMetadataCacheBoardPath(Path))
{
Counters = GetServiceCounters(counters, "utils");
}
static ui32 PickActiveNode(const TBoardInfoEntries& infoEntries) {
ui32 result = 0;
TInstant minStartTime = TInstant::Max();
for (const auto& [actor, entry] : infoEntries) {
if (entry.Dropped) {
continue;
}
NKikimrMetadataCache::TDatabaseMetadataCacheInfo info;
if (!info.ParseFromString(entry.Payload) || !info.HasStartTimestamp()) {
continue;
}
TInstant startTime = TInstant::MicroSeconds(info.GetStartTimestamp());
if (startTime < minStartTime) {
minStartTime = startTime;
result = actor.NodeId();
}
}
return result;
}
void Bootstrap() {
LOG_DEBUG_S(TActivationContext::AsActorContext(), NKikimrServices::DB_METADATA_CACHE, "Starting db metadata cache actor");
auto domainInfo = AppData()->DomainsInfo->Domains.begin()->second;
TInstant now = TActivationContext::Now();
NKikimrMetadataCache::TDatabaseMetadataCacheInfo info;
info.SetStartTimestamp(now.MicroSeconds());
PublishActor = RegisterWithSameMailbox(CreateBoardPublishActor(BoardPath,
info.SerializeAsString(),
SelfId(),
domainInfo->DefaultStateStorageGroup,
0,
true));
SubscribeToBoard();
Become(&TThis::StateWait);
}
void PassAway() override {
Send(PublishActor, new TEvents::TEvPoison);
Send(SubscribeActor, new TEvents::TEvPoison);
return TActor::PassAway();
}
STATEFN(StateWait) {
switch (ev->GetTypeRewrite()) {
IgnoreFunc(TEvRefreshCache);
hFunc(TEvStateStorage::TEvBoardInfo, Handle);
cFunc(TEvents::TEvPoison::EventType, PassAway);
hFunc(NHealthCheck::TEvSelfCheckResult, Handle);
hFunc(NHealthCheck::TEvSelfCheckRequestProto, Handle);
default: Y_ABORT("Unexpected event: %s", ev->ToString().c_str());
}
}
STATEFN(StateActive) {
switch (ev->GetTypeRewrite()) {
cFunc(EvRefreshCache, RefreshCache);
hFunc(NHealthCheck::TEvSelfCheckResult, Handle);
hFunc(NHealthCheck::TEvSelfCheckRequestProto, Handle);
hFunc(TEvStateStorage::TEvBoardInfo, Handle);
hFunc(TEvStateStorage::TEvBoardInfoUpdate, Handle);
cFunc(TEvents::TEvPoison::EventType, PassAway);
default: Y_ABORT("Unexpected event: %s", ev->ToString().c_str());
}
}
STATEFN(StateInactive) {
switch (ev->GetTypeRewrite()) {
IgnoreFunc(TEvRefreshCache);
hFunc(NHealthCheck::TEvSelfCheckResult, Handle);
hFunc(NHealthCheck::TEvSelfCheckRequestProto, Handle);
hFunc(TEvStateStorage::TEvBoardInfo, Handle);
hFunc(TEvStateStorage::TEvBoardInfoUpdate, Handle);
cFunc(TEvents::TEvPoison::EventType, PassAway);
default: Y_ABORT("Unexpected event: %s", ev->ToString().c_str());
}
}
};
inline TActorId MakeDatabaseMetadataCacheId(ui32 nodeId) {
return TActorId(nodeId, "METACACHE");
}
inline std::unique_ptr<IActor> CreateDatabaseMetadataCache(const TString& path, const ::NMonitoring::TDynamicCounterPtr& counters) {
return std::unique_ptr<IActor>(new TDatabaseMetadataCache(path, counters));
}
inline std::optional<TActorId> ResolveActiveDatabaseMetadataCache(const TMap<TActorId, TEvStateStorage::TBoardInfoEntry>& infoEntries) {
auto activeNode = TDatabaseMetadataCache::PickActiveNode(infoEntries);
if (activeNode == 0) {
return std::nullopt;
}
return MakeDatabaseMetadataCacheId(activeNode);
}
} // NKikimr
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