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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_resources.h"
namespace mongo {
const PlacementConcern AcquisitionPrerequisites::kPretendUnsharded =
PlacementConcern{boost::none, boost::none};
namespace shard_role_details {
namespace {
/**
* This method ensures that two read concerns are equivalent for the purposes of acquiring a
* transactional snapshot. Equivalence means that they don't acquire snapshot at conflicting levels,
* such as one operation asking for local and a subsequent one for majority. Similarly, we can't
* have two subsequent acquisitions asking for snapshots at two different timestamps.
*/
void assertReadConcernsAreEquivalent(const repl::ReadConcernArgs& rc1,
const repl::ReadConcernArgs& rc2) {
tassert(771230,
str::stream() << "Acquired two different collections on the same transaction with "
"read concerns that are not equivalent ("
<< rc1.toString() << " != " << rc2.toString() << ")",
rc1.getLevel() == rc2.getLevel() &&
rc1.getArgsAtClusterTime() == rc2.getArgsAtClusterTime());
}
} // namespace
TransactionResources::TransactionResources() = default;
TransactionResources::~TransactionResources() {
invariant(!locker);
invariant(!yieldedLocker);
invariant(!yieldedRecoveryUnit);
invariant(acquiredCollections.empty());
invariant(acquiredViews.empty());
}
AcquiredCollection& TransactionResources::addAcquiredCollection(
AcquiredCollection&& acquiredCollection) {
if (!readConcern) {
readConcern = acquiredCollection.prerequisites.readConcern;
}
assertReadConcernsAreEquivalent(*readConcern, acquiredCollection.prerequisites.readConcern);
return acquiredCollections.emplace_back(std::move(acquiredCollection));
}
const AcquiredView& TransactionResources::addAcquiredView(AcquiredView&& acquiredView) {
return acquiredViews.emplace_back(std::move(acquiredView));
}
void TransactionResources::releaseAllResourcesOnCommitOrAbort() noexcept {
readConcern.reset();
locker.reset();
yieldedLocker.reset();
yieldedRecoveryUnit.reset();
acquiredCollections.clear();
acquiredViews.clear();
}
void TransactionResources::assertNoAcquiredCollections() const {
if (acquiredCollections.empty())
return;
std::stringstream ss("Found acquired collections:");
for (const auto& acquisition : acquiredCollections) {
ss << "\n" << acquisition.prerequisites.nss.toStringForErrorMsg();
}
fassertFailedWithStatus(737660, Status{ErrorCodes::InternalError, ss.str()});
}
} // namespace shard_role_details
} // namespace mongo
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