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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/collection_index_usage_tracker.h"
#include "mongo/db/pipeline/document_source.h"
namespace mongo {
/**
* Provides a document source interface to retrieve index statistics for a given namespace.
* Each document returned represents a single index and mongod instance.
*/
class DocumentSourceIndexStats final : public DocumentSource {
public:
class LiteParsed final : public LiteParsedDocumentSource {
public:
static std::unique_ptr<LiteParsed> parse(const AggregationRequest& request,
const BSONElement& spec) {
return stdx::make_unique<LiteParsed>(request.getNamespaceString());
}
explicit LiteParsed(NamespaceString nss) : _nss(std::move(nss)) {}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
PrivilegeVector requiredPrivileges(bool isMongos) const final {
return {Privilege(ResourcePattern::forExactNamespace(_nss), ActionType::indexStats)};
}
bool isInitialSource() const final {
return true;
}
private:
const NamespaceString _nss;
};
// virtuals from DocumentSource
GetNextResult getNext() final;
const char* getSourceName() 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);
constraints.requiresInputDocSource = false;
return constraints;
}
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
private:
DocumentSourceIndexStats(const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
CollectionIndexUsageMap _indexStatsMap;
CollectionIndexUsageMap::const_iterator _indexStatsIter;
std::string _processName;
};
} // namespace mongo
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