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/**
* Copyright (C) 2021-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 "mongo/db/auth/authorization_manager.h"
#include "mongo/db/operation_context.h"
#include "mongo/stdx/unordered_map.h"
#include <stack>
namespace mongo {
/**
* The InternalSessionPool creates a pool of reusable sessions, as needed, that can be used
* to execute an internal transaction. Sessions are reaped from the pool if they have not been used
* for over 15 minutes. The session pool is partitioned by uid.
*/
class InternalSessionPool {
public:
class Session {
friend class InternalSessionPool;
public:
Session(LogicalSessionId lsid, TxnNumber txnNumber)
: _lsid(std::move(lsid)), _txnNumber(txnNumber) {}
const LogicalSessionId& getSessionId() const {
return _lsid;
}
const TxnNumber& getTxnNumber() const {
return _txnNumber;
}
private:
bool _isExpired(Date_t now) {
auto timeElapsed = now - _lastSeen;
return timeElapsed > Minutes(localLogicalSessionTimeoutMinutes / 2);
}
LogicalSessionId _lsid;
TxnNumber _txnNumber;
Date_t _lastSeen;
};
InternalSessionPool() = default;
static InternalSessionPool* get(ServiceContext* serviceContext);
static InternalSessionPool* get(OperationContext* opCtx);
/**
* Use this method to acquire an internal session for a system initiated transaction.
*/
Session acquireSystemSession();
/**
* Use this method to acquire an internal session when the user is not currently running a
* session.
*/
Session acquireStandaloneSession(OperationContext* opCtx);
/**
* Use this method to acquire an internal session nested in a client session.
*/
Session acquireChildSession(OperationContext* opCtx, const LogicalSessionId& parentLsid);
/**
* Use this method to release all types of acquired sessions back to the session pool. Upon
* release, all expired sessions are removed from the session pool.
*/
void release(Session session);
/**
* Use this method to confirm the size of list at _userSessionPool[userDigest]. To be used for
* testing only.
*/
std::size_t numSessionsForUser_forTest(SHA256Block userDigest);
private:
void _reapExpiredSessions(WithLock);
boost::optional<InternalSessionPool::Session> _acquireSession(SHA256Block userDigest, WithLock);
// Used for associating parent lsids with existing Sessions of the form <id, uid, txnUUID>.
LogicalSessionIdMap<Session> _childSessions;
// Map partitioning the session pool by logged in user.
stdx::unordered_map<SHA256Block, std::list<Session>, SHA256Block::Hash> _perUserSessionPool;
// Protects the internal data structures.
mutable Mutex _mutex = MONGO_MAKE_LATCH("InternalSessionPool::_mutex");
};
} // namespace mongo
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