129 lines
5.0 KiB
C++
129 lines
5.0 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/CommitProxyInterface.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,
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Standalone<VectorRef<ClientVersionRef>> versions,
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Standalone<VectorRef<StringRef>> issues)
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: 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(makeReference<AsyncVar<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)
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: hasConnected(false), intermediateConnFile(intermediateConnFile) {}
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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,
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Reference<AsyncVar<Optional<LeaderInterface>>> const& outKnownLeader);
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Future<Void> monitorLeaderForProxies(Value const& key,
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vector<NetworkAddress> const& coordinators,
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ClientData* const& clientData,
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Reference<AsyncVar<Optional<LeaderInfo>>> const& leaderInfo);
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Future<Void> monitorProxies(
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Reference<AsyncVar<Reference<ClusterConnectionFile>>> const& connFile,
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Reference<AsyncVar<ClientDBInfo>> const& clientInfo,
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Reference<AsyncVar<Optional<ClientLeaderRegInterface>>> const& coordinator,
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Reference<ReferencedObject<Standalone<VectorRef<ClientVersionRef>>>> const& supportedVersions,
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Key const& traceLogGroup);
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void shrinkProxyList(ClientDBInfo& ni,
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std::vector<UID>& lastCommitProxyUIDs,
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std::vector<CommitProxyInterface>& lastCommitProxies,
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std::vector<UID>& lastGrvProxyUIDs,
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std::vector<GrvProxyInterface>& lastGrvProxies);
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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,
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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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auto serializedInfo = makeReference<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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