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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/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
namespace mongo {
using std::string;
Status DBClientShardResolver::chooseWriteHost(const string& shardName,
ConnectionString* shardHost) const {
// Internally uses our shard cache, does no reload
std::shared_ptr<Shard> shard = grid.shardRegistry()->getShard(shardName);
if (!shard) {
return Status(ErrorCodes::ShardNotFound,
str::stream() << "unknown shard name " << shardName);
}
return findMaster(shard->getConnString(), shardHost);
}
Status DBClientShardResolver::findMaster(const ConnectionString& connString,
ConnectionString* resolvedHost) {
if (connString.type() == ConnectionString::MASTER) {
*resolvedHost = connString;
return Status::OK();
}
dassert(connString.type() == ConnectionString::SET);
//
// 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(connString.getSetName());
if (!replMonitor) {
// Slow path
std::set<HostAndPort> seedServers(connString.getServers().begin(),
connString.getServers().end());
ReplicaSetMonitor::createIfNeeded(connString.getSetName(), seedServers);
replMonitor = ReplicaSetMonitor::get(connString.getSetName());
}
if (!replMonitor) {
return Status(ErrorCodes::ReplicaSetNotFound,
str::stream() << "unknown replica set " << connString.getSetName());
}
try {
// This can throw when we don't find a master!
HostAndPort masterHostAndPort = replMonitor->getMasterOrUassert();
*resolvedHost =
fassertStatusOK(28687, ConnectionString::parse(masterHostAndPort.toString()));
return Status::OK();
} catch (const DBException&) {
return Status(ErrorCodes::HostNotFound,
string("could not contact primary for replica set ") +
replMonitor->getName());
}
MONGO_UNREACHABLE;
}
} // namespace mongo
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