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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.
*/
#pragma once
#include "mongo/db/pipeline/document_source.h"
namespace mongo {
/**
* Provides a document source interface to retrieve collection-level statistics for a given
* collection.
*/
class DocumentSourceCollStats : public DocumentSource {
public:
class LiteParsed final : public LiteParsedDocumentSource {
public:
static std::unique_ptr<LiteParsed> parse(const AggregationRequest& request,
const BSONElement& spec) {
return std::make_unique<LiteParsed>(request.getNamespaceString());
}
explicit LiteParsed(NamespaceString nss) : _nss(std::move(nss)) {}
bool isCollStats() const final {
return true;
}
PrivilegeVector requiredPrivileges(bool isMongos) const final {
return {Privilege(ResourcePattern::forExactNamespace(_nss), ActionType::collStats)};
}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
bool isInitialSource() const final {
return true;
}
private:
const NamespaceString _nss;
};
DocumentSourceCollStats(const boost::intrusive_ptr<ExpressionContext>& pExpCtx)
: DocumentSource(pExpCtx) {}
GetNextResult getNext() final;
const char* getSourceName() 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);
constraints.requiresInputDocSource = false;
return constraints;
}
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
return boost::none;
}
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
private:
// The raw object given to $collStats containing user specified options.
BSONObj _collStatsSpec;
bool _finished = false;
};
} // namespace mongo
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