/
replica_set_monitor_manager.h
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/
replica_set_monitor_manager.h
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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <string>
#include <vector>
#include "mongo/client/replica_set_change_notifier.h"
#include "mongo/executor/egress_tag_closer.h"
#include "mongo/executor/network_connection_hook.h"
#include "mongo/executor/network_interface.h"
#include "mongo/executor/task_executor.h"
#include "mongo/platform/mutex.h"
#include "mongo/util/hierarchical_acquisition.h"
#include "mongo/util/string_map.h"
namespace mongo {
class BSONObjBuilder;
class ConnectionString;
class ReplicaSetMonitor;
class MongoURI;
class ReplicaSetMonitorManagerNetworkConnectionHook final : public executor::NetworkConnectionHook {
public:
ReplicaSetMonitorManagerNetworkConnectionHook() = default;
virtual ~ReplicaSetMonitorManagerNetworkConnectionHook() = default;
Status validateHost(const HostAndPort& remoteHost,
const BSONObj& isMasterRequest,
const executor::RemoteCommandResponse& isMasterReply) override;
StatusWith<boost::optional<executor::RemoteCommandRequest>> makeRequest(
const HostAndPort& remoteHost) override;
Status handleReply(const HostAndPort& remoteHost,
executor::RemoteCommandResponse&& response) override;
};
class ReplicaSetMonitorConnectionManager : public executor::EgressTagCloser {
ReplicaSetMonitorConnectionManager() = delete;
public:
ReplicaSetMonitorConnectionManager(std::shared_ptr<executor::NetworkInterface> network)
: _network(network) {}
void dropConnections(const HostAndPort& hostAndPort) override;
// Not supported.
void dropConnections(transport::Session::TagMask tags) override {
MONGO_UNREACHABLE;
};
// Not supported.
void mutateTags(const HostAndPort& hostAndPort,
const std::function<transport::Session::TagMask(transport::Session::TagMask)>&
mutateFunc) override {
MONGO_UNREACHABLE;
};
private:
std::shared_ptr<executor::NetworkInterface> _network;
};
/**
* Manages the lifetime of a set of replica set monitors.
*/
class ReplicaSetMonitorManager {
ReplicaSetMonitorManager(const ReplicaSetMonitorManager&) = delete;
ReplicaSetMonitorManager& operator=(const ReplicaSetMonitorManager&) = delete;
public:
ReplicaSetMonitorManager() = default;
~ReplicaSetMonitorManager();
static ReplicaSetMonitorManager* get();
/**
* Create or retrieve a monitor for a particular replica set. The getter method returns
* nullptr if there is no monitor registered for the particular replica set.
*/
std::shared_ptr<ReplicaSetMonitor> getMonitor(StringData setName);
std::shared_ptr<ReplicaSetMonitor> getOrCreateMonitor(const ConnectionString& connStr);
std::shared_ptr<ReplicaSetMonitor> getOrCreateMonitor(const MongoURI& uri);
/**
* Retrieves the names of all sets tracked by this manager.
*/
std::vector<std::string> getAllSetNames();
/**
* Removes the specified replica set monitor from being tracked, if it exists. Otherwise
* does nothing. Once all shared_ptr references to that monitor are released, the monitor
* will be destroyed and will no longer be tracked.
*/
void removeMonitor(StringData setName);
std::shared_ptr<ReplicaSetMonitor> getMonitorForHost(const HostAndPort& host);
/**
* Removes and destroys all replica set monitors. Should be used for unit tests only.
*/
void removeAllMonitors();
/**
* Shuts down _taskExecutor.
*/
void shutdown();
/**
* Reports information about the replica sets tracked by us, for diagnostic purposes. If
* forFTDC, trim to minimize its size for full-time diagnostic data capture.
*/
void report(BSONObjBuilder* builder, bool forFTDC = false);
/**
* Returns an executor for running RSM tasks.
*/
std::shared_ptr<executor::TaskExecutor> getExecutor();
ReplicaSetChangeNotifier& getNotifier();
bool isShutdown() const;
private:
/**
* Returns an EgressTagCloser controlling the executor's network interface.
*/
std::shared_ptr<executor::EgressTagCloser> _getConnectionManager();
using ReplicaSetMonitorsMap = StringMap<std::weak_ptr<ReplicaSetMonitor>>;
// Protects access to the replica set monitors
mutable Mutex _mutex =
MONGO_MAKE_LATCH(HierarchicalAcquisitionLevel(6), "ReplicaSetMonitorManager::_mutex");
// Executor for monitoring replica sets.
std::shared_ptr<executor::TaskExecutor> _taskExecutor;
// Allows closing connections established by the network interface associated with the
// _taskExecutor instance
std::shared_ptr<ReplicaSetMonitorConnectionManager> _connectionManager;
// Widget to notify listeners when a RSM notices a change
ReplicaSetChangeNotifier _notifier;
// Needs to be after `_taskExecutor`, so that it will be destroyed before the `_taskExecutor`.
ReplicaSetMonitorsMap _monitors;
void _setupTaskExecutorInLock();
// set to true when shutdown has been called.
bool _isShutdown{false};
};
} // namespace mongo