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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/crypto/sha256_block.h"
#include "mongo/db/logical_session_cache.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/document_source_list_sessions_gen.h"
#include "mongo/db/pipeline/lite_parsed_document_source.h"
namespace mongo {
ListSessionsSpec listSessionsParseSpec(StringData stageName, const BSONElement& spec);
PrivilegeVector listSessionsRequiredPrivileges(const ListSessionsSpec& spec);
std::vector<SHA256Block> listSessionsUsersToDigests(const std::vector<ListSessionsUser>& users);
/**
* 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 DocumentSourceListLocalSessions final : public DocumentSource {
public:
static constexpr StringData kStageName = "$listLocalSessions"_sd;
class LiteParsed final : public LiteParsedDocumentSource {
public:
static std::unique_ptr<LiteParsed> parse(const NamespaceString& nss,
const BSONElement& spec) {
return std::make_unique<LiteParsed>(
listSessionsParseSpec(DocumentSourceListLocalSessions::kStageName, spec));
}
explicit LiteParsed(const ListSessionsSpec& spec) : _spec(spec) {}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
PrivilegeVector requiredPrivileges(bool isMongos,
bool bypassDocumentValidation) const final {
return listSessionsRequiredPrivileges(_spec);
}
bool isInitialSource() const final {
return true;
}
bool allowedToPassthroughFromMongos() const final {
return false;
}
ReadConcernSupportResult supportsReadConcern(repl::ReadConcernLevel level) const {
return onlyReadConcernLocalSupported(kStageName, level);
}
void assertSupportsMultiDocumentTransaction() const {
transactionNotSupported(DocumentSourceListLocalSessions::kStageName);
}
private:
const ListSessionsSpec _spec;
};
const char* getSourceName() const final {
return DocumentSourceListLocalSessions::kStageName.rawData();
}
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final {
return Value(Document{{getSourceName(), _spec.toBSON()}});
}
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
StageConstraints constraints(StreamType::kStreaming,
PositionRequirement::kFirst,
HostTypeRequirement::kLocalOnly,
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kNotAllowed,
LookupRequirement::kAllowed,
UnionRequirement::kNotAllowed);
constraints.isIndependentOfAnyCollection = true;
constraints.requiresInputDocSource = false;
return constraints;
}
boost::optional<DistributedPlanLogic> distributedPlanLogic() final {
return boost::none;
}
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement elem, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
private:
DocumentSourceListLocalSessions(const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
const ListSessionsSpec& spec);
GetNextResult doGetNext() final;
const ListSessionsSpec _spec;
const LogicalSessionCache* _cache;
std::vector<LogicalSessionId> _ids;
};
} // namespace mongo
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