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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 <memory>
#include <type_traits>
#include "mongo/client/connpool.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/sessions_collection.h"
#include "mongo/platform/mutex.h"
#include "mongo/util/time_support.h"
namespace mongo {
class OperationContext;
/**
* Accesses the sessions collection for replica set members.
*/
class SessionsCollectionRS final : public SessionsCollection {
public:
/**
* Ensures that the sessions collection exists and has the proper indexes.
*/
void setupSessionsCollection(OperationContext* opCtx) override;
/**
* Checks if the sessions collection exists and has the proper indexes.
*/
Status checkSessionsCollectionExists(OperationContext* opCtx) override;
/**
* Updates the last-use times on the given sessions to be greater than
* or equal to the current time.
*
* If a step-down happens on this node as this method is running, it may fail.
*/
Status refreshSessions(OperationContext* opCtx,
const LogicalSessionRecordSet& sessions) override;
/**
* Removes the authoritative records for the specified sessions.
*
* If a step-down happens on this node as this method is running, it may fail.
*/
Status removeRecords(OperationContext* opCtx, const LogicalSessionIdSet& sessions) override;
/**
* Returns the subset of sessions from the given set that do not have entries
* in the sessions collection.
*
* If a step-down happens on this node as this method is running, it may
* return stale results.
*/
StatusWith<LogicalSessionIdSet> findRemovedSessions(
OperationContext* opCtx, const LogicalSessionIdSet& sessions) override;
private:
auto _makePrimaryConnection(OperationContext* opCtx);
bool _isStandaloneOrPrimary(const NamespaceString& ns, OperationContext* opCtx);
template <typename LocalCallback, typename RemoteCallback>
struct CommonResult {
using LocalReturnType = std::invoke_result_t<LocalCallback>;
using RemoteReturnType = std::invoke_result_t<RemoteCallback, DBClientBase*>;
static_assert(std::is_same_v<LocalReturnType, RemoteReturnType>,
"LocalCallback and RemoteCallback must have the same return type");
using Type = RemoteReturnType;
};
template <typename LocalCallback, typename RemoteCallback>
using CommonResultT = typename CommonResult<LocalCallback, RemoteCallback>::Type;
template <typename LocalCallback, typename RemoteCallback>
CommonResultT<LocalCallback, RemoteCallback> _dispatch(const NamespaceString& ns,
OperationContext* opCtx,
LocalCallback&& localCallback,
RemoteCallback&& remoteCallback);
Mutex _mutex = MONGO_MAKE_LATCH("SessionsCollectionRS::_mutex");
std::unique_ptr<RemoteCommandTargeter> _targeter;
};
} // namespace mongo
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