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/**
* Copyright (C) 2015 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/platform/basic.h"
#include "mongo/client/remote_command_targeter_rs.h"
#include "mongo/base/status_with.h"
#include "mongo/client/read_preference.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
RemoteCommandTargeterRS::RemoteCommandTargeterRS(const std::string& rsName,
const std::vector<HostAndPort>& seedHosts)
: _rsName(rsName) {
_rsMonitor = ReplicaSetMonitor::get(rsName);
if (!_rsMonitor) {
std::set<HostAndPort> seedServers(seedHosts.begin(), seedHosts.end());
// TODO: Replica set monitor should be entirely owned and maintained by the remote
// command targeter. Otherwise, there is a slight race condition here where the
// RS monitor might be created, but then before the get call it gets removed so
// we end up with a NULL _rsMonitor.
ReplicaSetMonitor::createIfNeeded(rsName, seedServers);
_rsMonitor = ReplicaSetMonitor::get(rsName);
}
}
StatusWith<HostAndPort> RemoteCommandTargeterRS::findHost(const ReadPreferenceSetting& readPref) {
if (!_rsMonitor) {
return Status(ErrorCodes::ReplicaSetNotFound,
str::stream() << "unknown replica set " << _rsName);
}
HostAndPort hostAndPort = _rsMonitor->getHostOrRefresh(readPref);
if (hostAndPort.empty()) {
if (readPref.pref == ReadPreference::PrimaryOnly) {
return Status(ErrorCodes::NotMaster,
str::stream() << "No master found for set " << _rsName);
}
return Status(ErrorCodes::FailedToSatisfyReadPreference,
str::stream() << "could not find host matching read preference "
<< readPref.toString() << " for set " << _rsName);
}
return hostAndPort;
}
} // namespace mongo
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