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/**
* Copyright (C) 2013 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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.
*/
#include "mongo/s/dbclient_shard_resolver.h"
#include <set>
#include "mongo/client/replica_set_monitor.h"
#include "mongo/s/config.h"
#include "mongo/s/client/shard.h"
namespace mongo {
using std::string;
Status DBClientShardResolver::chooseWriteHost( const string& shardName,
ConnectionString* shardHost ) const {
// Declare up here for parsing later
string errMsg;
// Special-case for config
if (shardName == "config") {
*shardHost = ConnectionString::parse( configServer.modelServer(), errMsg );
dassert( errMsg == "" );
return Status::OK();
}
//
// First get the information about the shard from the shard cache
//
// Internally uses our shard cache, does no reload
Shard shard = Shard::findIfExists( shardName );
if ( shard.getName() == "" ) {
return Status( ErrorCodes::ShardNotFound,
string("unknown shard name ") + shardName );
}
return findMaster(shard.getConnString(), shardHost);
}
Status DBClientShardResolver::findMaster( const std::string connString,
ConnectionString* resolvedHost ) {
std::string errMsg;
ConnectionString rawHost = ConnectionString::parse( connString, errMsg );
dassert( errMsg == "" );
dassert( rawHost.type() == ConnectionString::SET
|| rawHost.type() == ConnectionString::MASTER );
if ( rawHost.type() == ConnectionString::MASTER ) {
*resolvedHost = rawHost;
return Status::OK();
}
//
// If we need to, then get the particular node we're targeting in the replica set
//
// Don't create the monitor unless we need to - fast path
ReplicaSetMonitorPtr replMonitor = ReplicaSetMonitor::get(rawHost.getSetName(), false);
if (!replMonitor) {
// Slow path
std::set<HostAndPort> seedServers(rawHost.getServers().begin(),
rawHost.getServers().end());
ReplicaSetMonitor::createIfNeeded(rawHost.getSetName(), seedServers);
replMonitor = ReplicaSetMonitor::get(rawHost.getSetName(), true);
}
if (!replMonitor) {
return Status( ErrorCodes::ReplicaSetNotFound,
string("unknown replica set ") + rawHost.getSetName() );
}
try {
// This can throw when we don't find a master!
HostAndPort masterHostAndPort = replMonitor->getMasterOrUassert();
*resolvedHost = ConnectionString::parse( masterHostAndPort.toString(), errMsg );
dassert( errMsg == "" );
return Status::OK();
}
catch ( const DBException& ) {
return Status( ErrorCodes::HostNotFound,
string("could not contact primary for replica set ")
+ replMonitor->getName() );
}
// Unreachable
dassert( false );
return Status( ErrorCodes::UnknownError, "" );
}
} // namespace mongo
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