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/**
* Copyright (C) 2019-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/platform/basic.h"
#include "mongo/db/pipeline/document_source_internal_shard_filter.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo {
//
// This DocumentSource is not registered and can only be created as part of expansions for other
// DocumentSources.
//
DocumentSourceInternalShardFilter::DocumentSourceInternalShardFilter(
const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
std::unique_ptr<ShardFilterer> shardFilterer)
: DocumentSource(kStageName, pExpCtx), _shardFilterer(std::move(shardFilterer)) {}
DocumentSource::GetNextResult DocumentSourceInternalShardFilter::doGetNext() {
auto next = pSource->getNext();
invariant(_shardFilterer);
for (; next.isAdvanced(); next = pSource->getNext()) {
const auto belongsRes = _shardFilterer->documentBelongsToMe(next.getDocument().toBson());
if (belongsRes == ShardFilterer::DocumentBelongsResult::kBelongs) {
return next;
}
if (belongsRes == ShardFilterer::DocumentBelongsResult::kNoShardKey) {
LOGV2_WARNING(23870,
"no shard key found in document {next_getDocument_toBson} for shard key "
"pattern {shardFilterer_getKeyPattern}, document may have been inserted "
"manually into shard",
"next_getDocument_toBson"_attr = redact(next.getDocument().toBson()),
"shardFilterer_getKeyPattern"_attr = _shardFilterer->getKeyPattern());
}
// For performance reasons, a streaming stage must not keep references to documents across
// calls to getNext(). Such stages must retrieve a result from their child and then release
// it (or return it) before asking for another result. Failing to do so can result in extra
// work, since the Document/Value library must copy data on write when that data has a
// refcount above one.
next.releaseDocument();
}
return next;
}
Pipeline::SourceContainer::iterator DocumentSourceInternalShardFilter::doOptimizeAt(
Pipeline::SourceContainer::iterator itr, Pipeline::SourceContainer* container) {
invariant(*itr == this);
if (_shardFilterer->isCollectionSharded()) {
return std::next(itr);
}
if (itr == container->begin()) {
// Delete this stage from the pipeline if the operation does not require shard versioning.
container->erase(itr);
return container->begin();
}
auto ret = std::prev(itr);
container->erase(itr);
return ret;
}
Value DocumentSourceInternalShardFilter::serialize(SerializationOptions opts) const {
return Value(DOC(getSourceName() << Document()));
}
} // namespace mongo
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