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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.
*/
#include "mongo/db/exec/write_stage_common.h"
#include "mongo/base/shim.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/exec/shard_filterer_impl.h"
#include "mongo/db/exec/working_set.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/transaction/transaction_participant.h"
#include "mongo/logv2/log.h"
#include "mongo/logv2/redaction.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kWrite
namespace mongo {
namespace write_stage_common {
PreWriteFilter::PreWriteFilter(OperationContext* opCtx, NamespaceString nss)
: _opCtx(opCtx), _nss(std::move(nss)), _skipFiltering([&] {
// Always allow writes on replica sets.
if (serverGlobalParams.clusterRole.has(ClusterRole::None)) {
return true;
}
// Always allow writes on standalone and secondary nodes.
const auto replCoord{repl::ReplicationCoordinator::get(opCtx)};
return !replCoord->canAcceptWritesForDatabase(opCtx, DatabaseName::kAdmin);
}()) {}
PreWriteFilter::Action PreWriteFilter::computeAction(const Document& doc) {
if (_skipFiltering) {
// Secondaries do not apply any filtering logic as the primary already did.
return Action::kWrite;
}
const auto docBelongsToMe = _documentBelongsToMe(doc.toBson());
if (docBelongsToMe)
return Action::kWrite;
else
return OperationShardingState::isComingFromRouter(_opCtx) ? Action::kSkip
: Action::kWriteAsFromMigrate;
}
bool PreWriteFilter::_documentBelongsToMe(const BSONObj& doc) {
if (!_shardFilterer) {
_shardFilterer = [&] {
auto scopedCss =
CollectionShardingState::assertCollectionLockedAndAcquire(_opCtx, _nss);
return std::make_unique<ShardFiltererImpl>(scopedCss->getOwnershipFilter(
_opCtx,
CollectionShardingState::OrphanCleanupPolicy::kAllowOrphanCleanup,
true /*supportNonVersionedOperations*/));
}();
}
const auto docBelongsToMe = _shardFilterer->documentBelongsToMe(doc);
uassert(ErrorCodes::ShardKeyNotFound,
str::stream() << "No shard key found in document " << redact(doc)
<< " and shard key pattern "
<< _shardFilterer->getKeyPattern().toString(),
docBelongsToMe != ShardFilterer::DocumentBelongsResult::kNoShardKey);
if (docBelongsToMe == ShardFilterer::DocumentBelongsResult::kBelongs) {
return true;
} else {
invariant(docBelongsToMe == ShardFilterer::DocumentBelongsResult::kDoesNotBelong);
return false;
}
}
void PreWriteFilter::restoreState() {
_shardFilterer.reset();
}
void PreWriteFilter::logSkippingDocument(const Document& doc,
StringData opKind,
const NamespaceString& collNs) {
LOGV2_DEBUG(5983201,
3,
"Skipping the operation to orphan document to prevent a wrong change "
"stream event",
"op"_attr = opKind,
logAttrs(collNs),
"record"_attr = doc);
}
void PreWriteFilter::logFromMigrate(const Document& doc,
StringData opKind,
const NamespaceString& collNs) {
LOGV2_DEBUG(6184700,
3,
"Marking the operation to orphan document with the fromMigrate flag to "
"prevent a wrong change stream event",
"op"_attr = opKind,
logAttrs(collNs),
"record"_attr = doc);
}
bool ensureStillMatches(const CollectionPtr& collection,
OperationContext* opCtx,
WorkingSet* ws,
WorkingSetID id,
const CanonicalQuery* cq) {
// If the snapshot changed, then we have to make sure we have the latest copy of the doc and
// that it still matches.
WorkingSetMember* member = ws->get(id);
if (opCtx->recoveryUnit()->getSnapshotId() != member->doc.snapshotId()) {
std::unique_ptr<SeekableRecordCursor> cursor(collection->getCursor(opCtx));
if (!WorkingSetCommon::fetch(opCtx, ws, id, cursor.get(), collection, collection->ns())) {
// Doc is already deleted.
return false;
}
// Make sure the re-fetched doc still matches the predicate.
if (cq && !cq->root()->matchesBSON(member->doc.value().toBson(), nullptr)) {
// No longer matches.
return false;
}
// Ensure that the BSONObj underlying the WorkingSetMember is owned because the cursor's
// destructor is allowed to free the memory.
member->makeObjOwnedIfNeeded();
}
return true;
}
bool isRetryableWrite(OperationContext* opCtx) {
const auto replCoord{repl::ReplicationCoordinator::get(opCtx)};
return replCoord->isRetryableWrite(opCtx);
}
} // namespace write_stage_common
} // namespace mongo
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