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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/client/remote_command_targeter_rs.h"
#include "mongo/base/status_with.h"
#include "mongo/client/connection_string.h"
#include "mongo/client/read_preference.h"
#include "mongo/client/replica_set_monitor.h"
#include "mongo/db/operation_context.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.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) {
std::set<HostAndPort> seedServers(seedHosts.begin(), seedHosts.end());
_rsMonitor = ReplicaSetMonitor::createIfNeeded(rsName, seedServers);
LOG(1) << "Started targeter for "
<< ConnectionString::forReplicaSet(
rsName, std::vector<HostAndPort>(seedServers.begin(), seedServers.end()));
}
ConnectionString RemoteCommandTargeterRS::connectionString() {
return uassertStatusOK(ConnectionString::parse(_rsMonitor->getServerAddress()));
}
StatusWith<HostAndPort> RemoteCommandTargeterRS::findHostWithMaxWait(
const ReadPreferenceSetting& readPref, Milliseconds maxWait) {
return _rsMonitor->getHostOrRefresh(readPref, maxWait);
}
StatusWith<HostAndPort> RemoteCommandTargeterRS::findHost(OperationContext* txn,
const ReadPreferenceSetting& readPref) {
auto clock = txn->getServiceContext()->getFastClockSource();
auto startDate = clock->now();
while (true) {
const auto interruptStatus = txn->checkForInterruptNoAssert();
if (!interruptStatus.isOK()) {
return interruptStatus;
}
const auto host = _rsMonitor->getHostOrRefresh(readPref, Milliseconds::zero());
if (host.getStatus() != ErrorCodes::FailedToSatisfyReadPreference) {
return host;
}
// Enforce a 20-second ceiling on the time spent looking for a host. This conforms with the
// behavior used throughout mongos prior to version 3.4, but is not fundamentally desirable.
// See comment in remote_command_targeter.h for details.
if (clock->now() - startDate > Seconds{20}) {
return host;
}
sleepFor(Milliseconds{500});
}
}
void RemoteCommandTargeterRS::markHostNotMaster(const HostAndPort& host, const Status& status) {
invariant(_rsMonitor);
_rsMonitor->failedHost(host, status);
}
void RemoteCommandTargeterRS::markHostUnreachable(const HostAndPort& host, const Status& status) {
invariant(_rsMonitor);
_rsMonitor->failedHost(host, status);
}
} // namespace mongo
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