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/** @file dbclient_rs.h - connect to a Replica Set, from C++ */
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "../pch.h"
#include "dbclient.h"
namespace mongo {
/** Use this class to connect to a replica set of servers. The class will manage
checking for which server in a replica set is master, and do failover automatically.
This can also be used to connect to replica pairs since pairs are a subset of sets
On a failover situation, expect at least one operation to return an error (throw
an exception) before the failover is complete. Operations are not retried.
*/
class DBClientReplicaSet : public DBClientBase {
string _name;
DBClientConnection * _currentMaster;
vector<HostAndPort> _servers;
vector<DBClientConnection*> _conns;
void _checkMaster();
DBClientConnection * checkMaster();
public:
/** Call connect() after constructing. autoReconnect is always on for DBClientReplicaSet connections. */
DBClientReplicaSet( const string& name , const vector<HostAndPort>& servers );
virtual ~DBClientReplicaSet();
/** Returns false if nomember of the set were reachable, or neither is
master, although,
when false returned, you can still try to use this connection object, it will
try reconnects.
*/
bool connect();
/** Authorize. Authorizes all nodes as needed
*/
virtual bool auth(const string &dbname, const string &username, const string &pwd, string& errmsg, bool digestPassword = true );
/** throws userassertion "no master found" */
virtual
auto_ptr<DBClientCursor> query(const string &ns, Query query, int nToReturn = 0, int nToSkip = 0,
const BSONObj *fieldsToReturn = 0, int queryOptions = 0 , int batchSize = 0 );
/** throws userassertion "no master found" */
virtual
BSONObj findOne(const string &ns, const Query& query, const BSONObj *fieldsToReturn = 0, int queryOptions = 0);
/** insert */
virtual void insert( const string &ns , BSONObj obj ) {
checkMaster()->insert(ns, obj);
}
/** insert multiple objects. Note that single object insert is asynchronous, so this version
is only nominally faster and not worth a special effort to try to use. */
virtual void insert( const string &ns, const vector< BSONObj >& v ) {
checkMaster()->insert(ns, v);
}
/** remove */
virtual void remove( const string &ns , Query obj , bool justOne = 0 ) {
checkMaster()->remove(ns, obj, justOne);
}
/** update */
virtual void update( const string &ns , Query query , BSONObj obj , bool upsert = 0 , bool multi = 0 ) {
return checkMaster()->update(ns, query, obj, upsert,multi);
}
virtual void killCursor( long long cursorID ){
checkMaster()->killCursor( cursorID );
}
string toString();
/* this is the callback from our underlying connections to notify us that we got a "not master" error.
*/
void isntMaster() {
_currentMaster = 0;
}
string getServerAddress() const;
DBClientConnection& masterConn();
DBClientConnection& slaveConn();
virtual bool call( Message &toSend, Message &response, bool assertOk=true ) { return checkMaster()->call( toSend , response , assertOk ); }
virtual void say( Message &toSend ) { checkMaster()->say( toSend ); }
virtual bool callRead( Message& toSend , Message& response ){ return checkMaster()->callRead( toSend , response ); }
virtual ConnectionString::ConnectionType type() const { return ConnectionString::SET; }
virtual bool isMember( const DBConnector * conn ) const;
virtual void checkResponse( const char *data, int nReturned ) { checkMaster()->checkResponse( data , nReturned ); }
virtual bool isFailed() const {
return _currentMaster == 0 || _currentMaster->isFailed();
}
protected:
virtual void sayPiggyBack( Message &toSend ) { checkMaster()->say( toSend ); }
};
}
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