111 lines
4.5 KiB
C++
111 lines
4.5 KiB
C++
/*
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* MonitorLeader.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FDBCLIENT_MONITORLEADER_H
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#define FDBCLIENT_MONITORLEADER_H
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#pragma once
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#include "fdbclient/FDBTypes.h"
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#include "fdbclient/CoordinationInterface.h"
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#include "fdbclient/ClusterInterface.h"
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#include "fdbclient/MasterProxyInterface.h"
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#define CLUSTER_FILE_ENV_VAR_NAME "FDB_CLUSTER_FILE"
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class ClientCoordinators;
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struct ClientStatusInfo {
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Key traceLogGroup;
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Standalone<VectorRef<ClientVersionRef>> versions;
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Standalone<VectorRef<StringRef>> issues;
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ClientStatusInfo() {}
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ClientStatusInfo(Key const& traceLogGroup, Standalone<VectorRef<ClientVersionRef>> versions, Standalone<VectorRef<StringRef>> issues) : traceLogGroup(traceLogGroup), versions(versions), issues(issues) {}
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};
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struct ClientData {
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std::map<NetworkAddress, ClientStatusInfo> clientStatusInfoMap;
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Reference<AsyncVar<CachedSerialization<ClientDBInfo>>> clientInfo;
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OpenDatabaseRequest getRequest();
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ClientData() : clientInfo( new AsyncVar<CachedSerialization<ClientDBInfo>>( CachedSerialization<ClientDBInfo>() ) ) {}
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};
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struct MonitorLeaderInfo {
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bool hasConnected;
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Reference<ClusterConnectionFile> intermediateConnFile;
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MonitorLeaderInfo() : hasConnected(false) {}
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explicit MonitorLeaderInfo( Reference<ClusterConnectionFile> intermediateConnFile ) : intermediateConnFile(intermediateConnFile), hasConnected(false) {}
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};
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// Monitors the given coordination group's leader election process and provides a best current guess
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// of the current leader. If a leader is elected for long enough and communication with a quorum of
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// coordinators is possible, eventually outKnownLeader will be that leader's interface.
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template <class LeaderInterface>
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Future<Void> monitorLeader( Reference<ClusterConnectionFile> const& connFile, Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader );
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Future<Void> monitorLeaderForProxies( Value const& key, vector<NetworkAddress> const& coordinators, ClientData* const& clientData, Reference<AsyncVar<Optional<LeaderInfo>>> const& leaderInfo );
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Future<Void> monitorProxies( Reference<AsyncVar<Reference<ClusterConnectionFile>>> const& connFile, Reference<AsyncVar<ClientDBInfo>> const& clientInfo, Reference<ReferencedObject<Standalone<VectorRef<ClientVersionRef>>>> const& supportedVersions, Key const& traceLogGroup );
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void shrinkProxyList( ClientDBInfo& ni, std::vector<UID>& lastProxyUIDs, std::vector<MasterProxyInterface>& lastProxies );
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#ifndef __INTEL_COMPILER
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#pragma region Implementation
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#endif
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Future<Void> monitorLeaderInternal( Reference<ClusterConnectionFile> const& connFile, Reference<AsyncVar<Value>> const& outSerializedLeaderInfo );
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template <class LeaderInterface>
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struct LeaderDeserializer {
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Future<Void> operator()(const Reference<AsyncVar<Value>>& serializedInfo,
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const Reference<AsyncVar<Optional<LeaderInterface>>>& outKnownLeader) {
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return asyncDeserialize(serializedInfo, outKnownLeader);
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}
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};
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Future<Void> asyncDeserializeClusterInterface(const Reference<AsyncVar<Value>>& serializedInfo,
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const Reference<AsyncVar<Optional<ClusterInterface>>>& outKnownLeader);
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template <>
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struct LeaderDeserializer<ClusterInterface> {
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Future<Void> operator()(const Reference<AsyncVar<Value>>& serializedInfo,
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const Reference<AsyncVar<Optional<ClusterInterface>>>& outKnownLeader) {
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return asyncDeserializeClusterInterface(serializedInfo, outKnownLeader);
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}
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};
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template <class LeaderInterface>
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Future<Void> monitorLeader(Reference<ClusterConnectionFile> const& connFile,
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Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader) {
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LeaderDeserializer<LeaderInterface> deserializer;
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Reference<AsyncVar<Value>> serializedInfo( new AsyncVar<Value> );
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Future<Void> m = monitorLeaderInternal( connFile, serializedInfo );
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return m || deserializer( serializedInfo, outKnownLeader );
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}
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#ifndef __INTEL_COMPILER
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#pragma endregion
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#endif
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#endif
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