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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.
*/
#pragma once
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/document_source_coll_stats.h"
#include "mongo/db/pipeline/document_source_internal_all_collection_stats_gen.h"
#include "mongo/db/pipeline/document_source_match.h"
namespace mongo {
/**
* This aggregation stage is the â$_internalAllCollectionStats´. It takes no arguments. Its
* response will be a cursor, each document of which represents the collection statistics for a
* single collection for all the existing collections.
*
* When executing the '$_internalAllCollectionStats' aggregation stage, we will need to obtain the
* catalog containing all collections namespaces.
*
* Then, for each collection, we will call `makeStatsForNs` method from DocumentSourceCollStats that
* will retrieve all storage stats for that particular collection.
*/
class DocumentSourceInternalAllCollectionStats final : public DocumentSource {
public:
static constexpr StringData kStageNameInternal = "$_internalAllCollectionStats"_sd;
DocumentSourceInternalAllCollectionStats(const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
DocumentSourceInternalAllCollectionStatsSpec spec);
class LiteParsed final : public LiteParsedDocumentSource {
public:
static std::unique_ptr<LiteParsed> parse(const NamespaceString& nss,
const BSONElement& spec) {
return std::make_unique<LiteParsed>(spec.fieldName());
}
explicit LiteParsed(std::string parseTimeName)
: LiteParsedDocumentSource(std::move(parseTimeName)) {}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
PrivilegeVector requiredPrivileges(bool isMongos,
bool bypassDocumentValidation) const final {
return {
Privilege(ResourcePattern::forClusterResource(), ActionType::allCollectionStats)};
}
bool isInitialSource() const final {
return true;
}
};
const char* getSourceName() const final;
void addVariableRefs(std::set<Variables::Id>* refs) const final{};
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
StageConstraints constraints(StreamType::kStreaming,
PositionRequirement::kFirst,
HostTypeRequirement::kAnyShard,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kNotAllowed,
LookupRequirement::kAllowed,
UnionRequirement::kAllowed);
constraints.isIndependentOfAnyCollection = true;
constraints.requiresInputDocSource = false;
return constraints;
}
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
return boost::none;
}
static boost::intrusive_ptr<DocumentSource> createFromBsonInternal(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
Pipeline::SourceContainer::iterator doOptimizeAt(Pipeline::SourceContainer::iterator itr,
Pipeline::SourceContainer* container) final;
void serializeToArray(
std::vector<Value>& array,
boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
private:
GetNextResult doGetNext() final;
// The specification object given to $_internalAllCollectionStats containing user specified
// options.
const DocumentSourceInternalAllCollectionStatsSpec _internalAllCollectionStatsSpec;
boost::optional<std::deque<BSONObj>> _catalogDocs;
// A $match stage can be absorbed in order to avoid unnecessarily computing the stats for
// collections that do not match that predicate.
boost::intrusive_ptr<DocumentSourceMatch> _absorbedMatch;
// If a $project stage exists after $_internalAllCollectionStats, we will peek the BSONObj
// associated with the $project. This BSONObj will be used to avoid calculating
// unnecessary fields.
boost::optional<BSONObj> _projectFilter;
};
} // namespace mongo
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