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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::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/rollback_checker.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
using RemoteCommandCallbackArgs = executor::TaskExecutor::RemoteCommandCallbackArgs;
using UniqueLock = stdx::unique_lock<stdx::mutex>;
RollbackChecker::RollbackChecker(executor::TaskExecutor* executor, HostAndPort syncSource)
: _executor(executor), _syncSource(syncSource), _baseRBID(-1), _lastRBID(-1) {
uassert(ErrorCodes::BadValue, "null task executor", executor);
}
RollbackChecker::~RollbackChecker() {}
RollbackChecker::CallbackHandle RollbackChecker::checkForRollback(const CallbackFn& nextAction) {
return _scheduleGetRollbackId(
[this, nextAction](const RemoteCommandCallbackArgs& args) {
if (args.response.getStatus() == ErrorCodes::CallbackCanceled) {
return;
}
if (!args.response.isOK()) {
nextAction(args.response.getStatus());
return;
}
if (auto rbidElement = args.response.getValue().data["rbid"]) {
int remoteRBID = rbidElement.numberInt();
UniqueLock lk(_mutex);
bool hadRollback = _checkForRollback_inlock(remoteRBID);
lk.unlock();
if (hadRollback) {
nextAction(Status(ErrorCodes::UnrecoverableRollbackError,
"RollbackChecker detected rollback occurred"));
} else {
nextAction(Status::OK());
}
} else {
nextAction(Status(ErrorCodes::CommandFailed,
"replSetGetRBID command failed when checking for rollback"));
}
},
nextAction);
}
bool RollbackChecker::hasHadRollback() {
// Default to true in case the callback is not called in an error case.
bool hasHadRollback = true;
auto cbh = checkForRollback(
[&hasHadRollback](const Status& status) { hasHadRollback = !status.isOK(); });
_executor->wait(cbh);
return hasHadRollback;
}
RollbackChecker::CallbackHandle RollbackChecker::reset(const CallbackFn& nextAction) {
return _scheduleGetRollbackId(
[this, nextAction](const RemoteCommandCallbackArgs& args) {
if (args.response.getStatus() == ErrorCodes::CallbackCanceled) {
return;
}
if (!args.response.isOK()) {
nextAction(args.response.getStatus());
return;
}
if (auto rbidElement = args.response.getValue().data["rbid"]) {
int newRBID = rbidElement.numberInt();
UniqueLock lk(_mutex);
_setRBID_inlock(newRBID);
lk.unlock();
nextAction(Status::OK());
} else {
nextAction(Status(ErrorCodes::CommandFailed,
"replSetGetRBID command failed when checking for rollback"));
}
},
nextAction);
}
Status RollbackChecker::reset_sync() {
// Default to an error in case the callback is not called in an error case.
Status resetStatus = Status(ErrorCodes::CommandFailed, "RollbackChecker reset failed");
auto cbh = reset([&resetStatus](const Status& status) { resetStatus = status; });
_executor->wait(cbh);
return resetStatus;
}
int RollbackChecker::getBaseRBID_forTest() {
stdx::lock_guard<stdx::mutex> lk(_mutex);
return _baseRBID;
}
int RollbackChecker::getLastRBID_forTest() {
stdx::lock_guard<stdx::mutex> lk(_mutex);
return _lastRBID;
}
bool RollbackChecker::_checkForRollback_inlock(int remoteRBID) {
_lastRBID = remoteRBID;
return remoteRBID != _baseRBID;
}
RollbackChecker::CallbackHandle RollbackChecker::_scheduleGetRollbackId(
const RemoteCommandCallbackFn& nextAction, const CallbackFn& errorFn) {
executor::RemoteCommandRequest getRollbackIDReq(
_syncSource, "admin", BSON("replSetGetRBID" << 1));
auto cbh = _executor->scheduleRemoteCommand(getRollbackIDReq, nextAction);
if (cbh.getStatus() == ErrorCodes::ShutdownInProgress) {
return RollbackChecker::CallbackHandle();
}
if (!cbh.isOK()) {
errorFn(cbh.getStatus());
return RollbackChecker::CallbackHandle();
}
return cbh.getValue();
}
void RollbackChecker::_setRBID_inlock(int rbid) {
_baseRBID = rbid;
_lastRBID = rbid;
}
} // namespace repl
} // namespace mongo
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