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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 <functional>
#include "mongo/db/logical_session_id.h"
namespace mongo {
class DBClientBase;
class OperationContext;
/**
* An abstract interface describing the entrypoint into the sessions collection.
*
* Different server deployments (standalone, replica set, sharded cluster) should
* implement their own classes that fulfill this interface.
*/
class SessionsCollection {
public:
static constexpr StringData kSessionsTTLIndex = "lsidTTLIndex"_sd;
virtual ~SessionsCollection();
/**
* Ensures that the sessions collection exists and has the proper indexes. Implementations of
* this method must support multiple concurrent invocations.
*/
virtual void setupSessionsCollection(OperationContext* opCtx) = 0;
/**
* Checks if the sessions collection exists and has the proper indexes.
*/
virtual void checkSessionsCollectionExists(OperationContext* opCtx) = 0;
/**
* Updates the last-use times on the given sessions to be greater than or equal to the given
* time. Throws an exception if a networking issue occurred.
*/
virtual void refreshSessions(OperationContext* opCtx,
const LogicalSessionRecordSet& sessions) = 0;
/**
* Removes the authoritative records for the specified sessions.
*
* Implementations should perform authentication checks to ensure that session records may only
* be removed if their owner is logged in.
*
* Throws an exception if the removal fails, for example from a network error.
*/
virtual void removeRecords(OperationContext* opCtx, const LogicalSessionIdSet& sessions) = 0;
/**
* Checks a set of lsids and returns the set that no longer exists.
*
* Throws an exception if the fetch cannot occur, for example from a network error.
*/
virtual LogicalSessionIdSet findRemovedSessions(OperationContext* opCtx,
const LogicalSessionIdSet& sessions) = 0;
/**
* Generates a createIndexes command for the sessions collection TTL index.
*/
static BSONObj generateCreateIndexesCmd();
/*
* Generates a collMod command for the sessions collection TTL index.
*/
static BSONObj generateCollModCmd();
protected:
SessionsCollection();
using SendBatchFn = std::function<void(BSONObj batch)>;
static SendBatchFn makeSendFnForCommand(const NamespaceString& ns, DBClientBase* client);
static SendBatchFn makeSendFnForBatchWrite(const NamespaceString& ns, DBClientBase* client);
using FindBatchFn = std::function<BSONObj(BSONObj batch)>;
static FindBatchFn makeFindFnForCommand(const NamespaceString& ns, DBClientBase* client);
/**
* Formats and sends batches of refreshes for the given set of sessions.
*/
void _doRefresh(const NamespaceString& ns,
const std::vector<LogicalSessionRecord>& sessions,
SendBatchFn send);
/**
* Formats and sends batches of deletes for the given set of sessions.
*/
void _doRemove(const NamespaceString& ns,
const std::vector<LogicalSessionId>& sessions,
SendBatchFn send);
/**
* Returns those lsids from the input 'sessions' array which are not present in the sessions
* collection. Note that a parent session and its child sessions are tracked as one session in
* the sessions collection.
*/
LogicalSessionIdSet _doFindRemoved(const NamespaceString& ns,
const std::vector<LogicalSessionId>& sessions,
FindBatchFn send);
};
} // namespace mongo
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