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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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::kTransaction
#include "mongo/platform/basic.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/txn_cmds_gen.h"
#include "mongo/db/curop_failpoint_helpers.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/s/transaction_coordinator_service.h"
#include "mongo/db/service_context.h"
#include "mongo/db/transaction_participant.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
MONGO_FAIL_POINT_DEFINE(participantReturnNetworkErrorForAbortAfterExecutingAbortLogic);
MONGO_FAIL_POINT_DEFINE(participantReturnNetworkErrorForCommitAfterExecutingCommitLogic);
MONGO_FAIL_POINT_DEFINE(hangBeforeCommitingTxn);
MONGO_FAIL_POINT_DEFINE(hangBeforeAbortingTxn);
// TODO SERVER-39704: Remove this fail point once the router can safely retry within a transaction
// on stale version and snapshot errors.
MONGO_FAIL_POINT_DEFINE(dontRemoveTxnCoordinatorOnAbort);
class CmdCommitTxn : public BasicCommand {
public:
CmdCommitTxn() : BasicCommand("commitTransaction") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
virtual bool adminOnly() const {
return true;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
std::string help() const override {
return "Commits a transaction";
}
Status checkAuthForOperation(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj) const override {
return Status::OK();
}
bool run(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
IDLParserErrorContext ctx("commitTransaction");
auto cmd = CommitTransaction::parse(ctx, cmdObj);
auto txnParticipant = TransactionParticipant::get(opCtx);
uassert(ErrorCodes::CommandFailed,
"commitTransaction must be run within a transaction",
txnParticipant);
LOG(3) << "Received commitTransaction for transaction with txnNumber "
<< opCtx->getTxnNumber() << " on session " << opCtx->getLogicalSessionId()->toBSON();
// commitTransaction is retryable.
if (txnParticipant.transactionIsCommitted()) {
// We set the client last op to the last optime observed by the system to ensure that
// we wait for the specified write concern on an optime greater than or equal to the
// commit oplog entry.
auto& replClient = repl::ReplClientInfo::forClient(opCtx->getClient());
replClient.setLastOpToSystemLastOpTime(opCtx);
if (MONGO_FAIL_POINT(participantReturnNetworkErrorForCommitAfterExecutingCommitLogic)) {
uasserted(ErrorCodes::HostUnreachable,
"returning network error because failpoint is on");
}
return true;
}
uassert(ErrorCodes::NoSuchTransaction,
"Transaction isn't in progress",
txnParticipant.transactionIsOpen());
CurOpFailpointHelpers::waitWhileFailPointEnabled(
&hangBeforeCommitingTxn, opCtx, "hangBeforeCommitingTxn");
auto optionalCommitTimestamp = cmd.getCommitTimestamp();
if (optionalCommitTimestamp) {
// commitPreparedTransaction will throw if the transaction is not prepared.
txnParticipant.commitPreparedTransaction(opCtx, optionalCommitTimestamp.get(), {});
} else {
if (ShardingState::get(opCtx)->canAcceptShardedCommands().isOK() ||
serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {
TransactionCoordinatorService::get(opCtx)->cancelIfCommitNotYetStarted(
opCtx, *opCtx->getLogicalSessionId(), *opCtx->getTxnNumber());
}
// commitUnpreparedTransaction will throw if the transaction is prepared.
txnParticipant.commitUnpreparedTransaction(opCtx);
}
if (MONGO_FAIL_POINT(participantReturnNetworkErrorForCommitAfterExecutingCommitLogic)) {
uasserted(ErrorCodes::HostUnreachable,
"returning network error because failpoint is on");
}
return true;
}
} commitTxn;
class CmdAbortTxn : public BasicCommand {
public:
CmdAbortTxn() : BasicCommand("abortTransaction") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
virtual bool adminOnly() const {
return true;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
std::string help() const override {
return "Aborts a transaction";
}
Status checkAuthForOperation(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj) const override {
return Status::OK();
}
bool run(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
auto txnParticipant = TransactionParticipant::get(opCtx);
uassert(ErrorCodes::CommandFailed,
"abortTransaction must be run within a transaction",
txnParticipant);
LOG(3) << "Received abortTransaction for transaction with txnNumber "
<< opCtx->getTxnNumber() << " on session " << opCtx->getLogicalSessionId()->toBSON();
uassert(ErrorCodes::NoSuchTransaction,
"Transaction isn't in progress",
txnParticipant.transactionIsOpen());
CurOpFailpointHelpers::waitWhileFailPointEnabled(
&hangBeforeAbortingTxn, opCtx, "hangBeforeAbortingTxn");
if (!MONGO_FAIL_POINT(dontRemoveTxnCoordinatorOnAbort) &&
(ShardingState::get(opCtx)->canAcceptShardedCommands().isOK() ||
serverGlobalParams.clusterRole == ClusterRole::ConfigServer)) {
TransactionCoordinatorService::get(opCtx)->cancelIfCommitNotYetStarted(
opCtx, *opCtx->getLogicalSessionId(), *opCtx->getTxnNumber());
}
txnParticipant.abortTransaction(opCtx);
if (MONGO_FAIL_POINT(participantReturnNetworkErrorForAbortAfterExecutingAbortLogic)) {
uasserted(ErrorCodes::HostUnreachable,
"returning network error because failpoint is on");
}
return true;
}
} abortTxn;
} // namespace
} // namespace mongo
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