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/**
* Copyright 2016 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::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/freshness_scanner.h"
#include "mongo/base/status.h"
#include "mongo/db/repl/bson_extract_optime.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/db/repl/scatter_gather_runner.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
using executor::RemoteCommandRequest;
FreshnessScanner::Algorithm::Algorithm(const ReplicaSetConfig& rsConfig,
int myIndex,
Milliseconds timeout)
: _rsConfig(rsConfig), _myIndex(myIndex), _timeout(timeout) {
for (int index = 0; index < _rsConfig.getNumMembers(); index++) {
if (index != _myIndex) {
_targets.push_back(_rsConfig.getMemberAt(index).getHostAndPort());
}
}
_totalRequests = _targets.size();
}
std::vector<RemoteCommandRequest> FreshnessScanner::Algorithm::getRequests() const {
BSONObjBuilder cmdBuilder;
cmdBuilder << "replSetGetStatus" << 1;
const BSONObj getStatusCmd = cmdBuilder.obj();
std::vector<RemoteCommandRequest> requests;
for (auto& target : _targets) {
requests.push_back(RemoteCommandRequest(target, "admin", getStatusCmd, _timeout));
}
return requests;
}
void FreshnessScanner::Algorithm::processResponse(const RemoteCommandRequest& request,
const ResponseStatus& response) {
_responsesProcessed++;
if (!response.isOK()) { // failed response
LOG(2) << "FreshnessScanner: Got failed response from " << request.target << ": "
<< response.getStatus();
} else {
BSONObj opTimesObj = response.getValue().data.getObjectField("optimes");
OpTime lastOpTime;
Status status = bsonExtractOpTimeField(opTimesObj, "appliedOpTime", &lastOpTime);
if (!status.isOK()) {
return;
}
int index = _rsConfig.findMemberIndexByHostAndPort(request.target);
FreshnessInfo freshnessInfo{index, lastOpTime};
auto cmp =
[](const FreshnessInfo& a, const FreshnessInfo& b) { return a.opTime > b.opTime; };
auto iter =
std::upper_bound(_freshnessInfos.begin(), _freshnessInfos.end(), freshnessInfo, cmp);
_freshnessInfos.insert(iter, freshnessInfo);
}
}
bool FreshnessScanner::Algorithm::hasReceivedSufficientResponses() const {
return _responsesProcessed == _totalRequests;
}
FreshnessScanner::Result FreshnessScanner::Algorithm::getResult() const {
invariant(hasReceivedSufficientResponses());
return _freshnessInfos;
}
StatusWith<ReplicationExecutor::EventHandle> FreshnessScanner::start(
ReplicationExecutor* executor,
const ReplicaSetConfig& rsConfig,
int myIndex,
Milliseconds timeout) {
_algorithm.reset(new Algorithm(rsConfig, myIndex, timeout));
_runner.reset(new ScatterGatherRunner(_algorithm.get(), executor));
return _runner->start();
}
void FreshnessScanner::cancel() {
_runner->cancel();
}
FreshnessScanner::Result FreshnessScanner::getResult() const {
return _algorithm->getResult();
}
} // namespace repl
} // namespace mongo
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