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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 <vector>
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/generic_cursor.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/document_sources_gen.h"
#include "mongo/db/pipeline/lite_parsed_document_source.h"
namespace mongo {
/**
* Produces one document per session in the local cache if 'allUsers' is specified
* as true, and returns just sessions for the currently logged in user if
* 'allUsers' is specified as false, or not specified at all.
*/
class DocumentSourceListLocalCursors final : public DocumentSource {
public:
static const char* kStageName;
class LiteParsed final : public LiteParsedDocumentSource {
public:
explicit LiteParsed(std::string parseTimeName)
: LiteParsedDocumentSource(std::move(parseTimeName)) {}
static std::unique_ptr<LiteParsed> parse(const AggregationRequest& request,
const BSONElement& spec) {
return stdx::make_unique<LiteParsed>(spec.fieldName());
}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
PrivilegeVector requiredPrivileges(bool isMongos) const final {
return {Privilege(ResourcePattern::forClusterResource(), ActionType::listCursors)};
}
bool isInitialSource() const final {
return true;
}
bool allowedToForwardFromMongos() const final {
return false;
}
void assertSupportsReadConcern(const repl::ReadConcernArgs& readConcern) const {
uassert(ErrorCodes::InvalidOptions,
str::stream() << "Aggregation stage " << kStageName << " cannot run with a "
<< "readConcern other than 'local', or in a multi-document "
<< "transaction. Current readConcern: "
<< readConcern.toString(),
readConcern.getLevel() == repl::ReadConcernLevel::kLocalReadConcern);
}
};
GetNextResult getNext() final;
const char* getSourceName() const final {
return kStageName;
}
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final {
return Value(Document{{getSourceName(), Document{}}});
}
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
StageConstraints constraints(StreamType::kStreaming,
PositionRequirement::kFirst,
HostTypeRequirement::kLocalOnly,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kNotAllowed);
constraints.isIndependentOfAnyCollection = true;
constraints.requiresInputDocSource = false;
return constraints;
}
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
private:
DocumentSourceListLocalCursors(const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
std::vector<GenericCursor> _cursors;
};
} // namespace mongo
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