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/**
* Copyright (C) 2022-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.
*/
#include "mongo/db/transaction/session_catalog_mongod_transaction_interface_impl.h"
#include "mongo/db/transaction/transaction_participant.h"
#include "mongo/logv2/log.h"
#include "mongo/s/transaction_router.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kTransaction
namespace mongo {
bool MongoDSessionCatalogTransactionInterfaceImpl::isTransactionPrepared(
const ObservableSession& session) {
const auto participant = TransactionParticipant::get(session);
return participant.transactionIsPrepared();
}
bool MongoDSessionCatalogTransactionInterfaceImpl::isTransactionInProgress(
OperationContext* opCtx) {
const auto txnParticipant = TransactionParticipant::get(opCtx);
return txnParticipant.transactionIsInProgress();
}
void MongoDSessionCatalogTransactionInterfaceImpl::refreshTransactionFromStorageIfNeeded(
OperationContext* opCtx) {
auto txnParticipant = TransactionParticipant::get(opCtx);
txnParticipant.refreshFromStorageIfNeeded(opCtx);
}
void MongoDSessionCatalogTransactionInterfaceImpl::
refreshTransactionFromStorageIfNeededNoOplogEntryFetch(OperationContext* opCtx) {
auto txnParticipant = TransactionParticipant::get(opCtx);
txnParticipant.refreshFromStorageIfNeededNoOplogEntryFetch(opCtx);
}
void MongoDSessionCatalogTransactionInterfaceImpl::beginOrContinueTransactionUnconditionally(
OperationContext* opCtx, TxnNumberAndRetryCounter txnNumberAndRetryCounter) {
auto txnParticipant = TransactionParticipant::get(opCtx);
txnParticipant.beginOrContinueTransactionUnconditionally(opCtx,
std::move(txnNumberAndRetryCounter));
}
void MongoDSessionCatalogTransactionInterfaceImpl::abortTransaction(
OperationContext* opCtx, const SessionTxnRecord& txnRecord) {
auto txnParticipant = TransactionParticipant::get(opCtx);
LOGV2_DEBUG(21978,
3,
"Aborting transaction sessionId: {sessionId} txnNumber {txnNumber}",
"Aborting transaction",
"sessionId"_attr = txnRecord.getSessionId().toBSON(),
"txnNumber"_attr = txnRecord.getTxnNum());
txnParticipant.abortTransaction(opCtx);
opCtx->resetMultiDocumentTransactionState();
}
void MongoDSessionCatalogTransactionInterfaceImpl::refreshLocksForPreparedTransaction(
OperationContext* opCtx, const OperationSessionInfo& sessionInfo) {
auto txnParticipant = TransactionParticipant::get(opCtx);
LOGV2_DEBUG(21979,
3,
"Restoring locks of prepared transaction. SessionId: {sessionId} "
"TxnNumberAndRetryCounter: {txnNumberAndRetryCounter}",
"Restoring locks of prepared transaction",
"sessionId"_attr = sessionInfo.getSessionId()->getId(),
"txnNumberAndRetryCounter"_attr =
txnParticipant.getActiveTxnNumberAndRetryCounter());
txnParticipant.refreshLocksForPreparedTransaction(opCtx, /*yieldLocks=*/false);
}
void MongoDSessionCatalogTransactionInterfaceImpl::invalidateSessionToKill(
OperationContext* opCtx, const SessionToKill& session) {
auto participant = TransactionParticipant::get(session);
participant.invalidate(opCtx);
}
MongoDSessionCatalogTransactionInterface::ScanSessionsCallbackFn
MongoDSessionCatalogTransactionInterfaceImpl::makeParentSessionWorkerFnForReap(
TxnNumber* parentSessionActiveTxnNumber) {
return [parentSessionActiveTxnNumber](ObservableSession& parentSession) {
const auto& transactionSessionId = parentSession.getSessionId();
const auto txnParticipant = TransactionParticipant::get(parentSession);
const auto txnRouter = TransactionRouter::get(parentSession);
*parentSessionActiveTxnNumber =
txnParticipant.getActiveTxnNumberAndRetryCounter().getTxnNumber();
if (txnParticipant.canBeReaped() && txnRouter.canBeReaped()) {
LOGV2_DEBUG(6753702,
5,
"Marking parent transaction session for reap",
"lsid"_attr = transactionSessionId);
// This is an external session so it can be reaped if and only if all of its
// internal sessions can be reaped.
parentSession.markForReap(ObservableSession::ReapMode::kNonExclusive);
}
};
}
MongoDSessionCatalogTransactionInterface::ScanSessionsCallbackFn
MongoDSessionCatalogTransactionInterfaceImpl::makeChildSessionWorkerFnForReap(
const TxnNumber& parentSessionActiveTxnNumber) {
return [&parentSessionActiveTxnNumber](ObservableSession& childSession) {
const auto& transactionSessionId = childSession.getSessionId();
const auto txnParticipant = TransactionParticipant::get(childSession);
const auto txnRouter = TransactionRouter::get(childSession);
if (txnParticipant.canBeReaped() && txnRouter.canBeReaped()) {
if (isInternalSessionForNonRetryableWrite(transactionSessionId)) {
LOGV2_DEBUG(6753703,
5,
"Marking child transaction session for reap",
"lsid"_attr = transactionSessionId);
// This is an internal session for a non-retryable write so it can be reaped
// independently of the external session that write ran in.
childSession.markForReap(ObservableSession::ReapMode::kExclusive);
} else if (isInternalSessionForRetryableWrite(transactionSessionId)) {
LOGV2_DEBUG(6753704,
5,
"Marking child transaction session for reap",
"lsid"_attr = transactionSessionId);
// This is an internal session for a retryable write so it must be reaped
// atomically with the external session and internal sessions for that
// retryable write, unless the write is no longer active (i.e. there is
// already a retryable write or transaction with a higher txnNumber).
childSession.markForReap(*transactionSessionId.getTxnNumber() <
parentSessionActiveTxnNumber
? ObservableSession::ReapMode::kExclusive
: ObservableSession::ReapMode::kNonExclusive);
} else {
MONGO_UNREACHABLE;
}
}
};
}
MongoDSessionCatalogTransactionInterface::ScanSessionsCallbackFn
MongoDSessionCatalogTransactionInterfaceImpl::makeSessionWorkerFnForStepUp(
std::vector<SessionCatalog::KillToken>* sessionKillTokens,
std::vector<OperationSessionInfo>* sessionsToReacquireLocks) {
return [sessionKillTokens, sessionsToReacquireLocks](ObservableSession& session) {
const auto txnParticipant = TransactionParticipant::get(session);
if (!txnParticipant.transactionIsOpen()) {
sessionKillTokens->emplace_back(session.kill());
}
if (txnParticipant.transactionIsPrepared()) {
const auto txnNumberAndRetryCounter =
txnParticipant.getActiveTxnNumberAndRetryCounter();
OperationSessionInfo sessionInfo;
sessionInfo.setSessionId(session.getSessionId());
sessionInfo.setTxnNumber(txnNumberAndRetryCounter.getTxnNumber());
sessionInfo.setTxnRetryCounter(txnNumberAndRetryCounter.getTxnRetryCounter());
sessionsToReacquireLocks->emplace_back(sessionInfo);
}
};
}
MongoDSessionCatalogTransactionInterface::ScanSessionsCallbackFn
MongoDSessionCatalogTransactionInterfaceImpl::makeSessionWorkerFnForEagerReap(
TxnNumber clientTxnNumberStarted, SessionCatalog::Provenance provenance) {
return [clientTxnNumberStarted, provenance](ObservableSession& osession) {
const auto& transactionSessionId = osession.getSessionId();
const auto txnParticipant = TransactionParticipant::get(osession);
// If a retryable session has been used for a TransactionParticipant, it may be in the
// retryable participant catalog. A participant triggers eager reaping after clearing its
// participant catalog, but a router may trigger reaping before, so we can only eager reap
// an initialized participant if the reap came from the participant role.
if (provenance == SessionCatalog::Provenance::kParticipant ||
txnParticipant.getActiveTxnNumberAndRetryCounter().getTxnNumber() ==
kUninitializedTxnNumber) {
if (isInternalSessionForRetryableWrite(transactionSessionId) &&
*transactionSessionId.getTxnNumber() < clientTxnNumberStarted) {
osession.markForReap(ObservableSession::ReapMode::kExclusive);
}
}
};
}
} // namespace mongo
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