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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 "mongo/client/connpool.h"
namespace mongo {
class ChunkManager;
class ShardConnection : public AScopedConnection {
public:
/**
* Instantiates a new sharded connection, which will be associated with the specified chunk
* manager for versioning purposes.
*
* @param connectionString Connection string for the host to use.
* @param ns Namespace to associate the version with.
* @param manager The chunk manager, which should be used for obtaining shard version
* information to be set on the connection. This value can be nullptr, if the connection will
* not be versioned and not associated with a namespace, in which case only the
* setShardVersion command will be invoked to initialize the remote shard. Otherwise, the
* chunk manager will be used to obtain the shard version to set on the connection.
*/
ShardConnection(OperationContext* opCtx,
const ConnectionString& connectionString,
const std::string& ns,
std::shared_ptr<ChunkManager> manager = nullptr);
~ShardConnection();
void done();
void kill();
DBClientBase& conn() {
_finishInit();
verify(_conn);
return *_conn;
}
DBClientBase* operator->() {
_finishInit();
verify(_conn);
return _conn;
}
DBClientBase* get() {
_finishInit();
verify(_conn);
return _conn;
}
/**
* @return the connection object underneath without setting the shard version.
* @throws AssertionException if _conn is uninitialized.
*/
DBClientBase* getRawConn() const {
verify(_conn);
return _conn;
}
std::string getHost() const {
return _cs.toString();
}
std::string getNS() const {
return _ns;
}
std::shared_ptr<ChunkManager> getManager() const {
return _manager;
}
bool setVersion() {
_finishInit();
return _setVersion;
}
void donotCheckVersion() {
invariant(!_finishedInit);
_finishedInit = true;
_setVersion = false;
}
bool ok() const {
return _conn != NULL;
}
/** reports all thread local connections on this instance */
static void reportActiveClientConnections(BSONObjBuilder* builder);
/** checks all of my thread local connections for the version of this ns */
static void checkMyConnectionVersions(OperationContext* opCtx, const std::string& ns);
/**
* Returns all the current sharded connections to the pool.
* Note: This is *dangerous* if we have GLE state.
*/
static void releaseMyConnections();
/**
* Clears all connections in the sharded pool, including connections in the
* thread local storage pool of the current thread.
*/
static void clearPool();
/**
* Forgets a namespace to prevent future versioning.
*/
static void forgetNS(const std::string& ns);
private:
void _finishInit();
const ConnectionString _cs;
const std::string _ns;
const std::shared_ptr<ChunkManager> _manager;
bool _finishedInit{false};
// Specifies whether the call to _finishInit established a version on the connection
bool _setVersion{false};
DBClientBase* _conn;
};
/**
* Global sharded connection pool, used by all instances of ShardConnection.
*/
extern DBConnectionPool shardConnectionPool;
} // namespace mongo
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