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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 <list>
#include "mongo/platform/atomic_word.h"
#include "mongo/platform/mutex.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/variant.h"
#include "mongo/transport/service_entry_point.h"
#include "mongo/transport/service_executor_reserved.h"
#include "mongo/transport/service_state_machine.h"
#include "mongo/util/hierarchical_acquisition.h"
#include "mongo/util/net/cidr.h"
namespace mongo {
class ServiceContext;
namespace transport {
class Session;
} // namespace transport
/**
* A basic entry point from the TransportLayer into a server.
*
* The server logic is implemented inside of handleRequest() by a subclass.
* startSession() spawns and detaches a new thread for each incoming connection
* (transport::Session).
*/
class ServiceEntryPointImpl : public ServiceEntryPoint {
ServiceEntryPointImpl(const ServiceEntryPointImpl&) = delete;
ServiceEntryPointImpl& operator=(const ServiceEntryPointImpl&) = delete;
public:
explicit ServiceEntryPointImpl(ServiceContext* svcCtx);
void startSession(transport::SessionHandle session) override;
void endAllSessions(transport::Session::TagMask tags) final;
Status start() final;
bool shutdown(Milliseconds timeout) final;
void appendStats(BSONObjBuilder* bob) const final;
size_t numOpenSessions() const final {
return _currentConnections.load();
}
private:
using SSMList = std::list<std::shared_ptr<ServiceStateMachine>>;
using SSMListIterator = SSMList::iterator;
ServiceContext* const _svcCtx;
AtomicWord<std::size_t> _nWorkers;
mutable Mutex _sessionsMutex =
MONGO_MAKE_LATCH(HierarchicalAcquisitionLevel(0), "ServiceEntryPointImpl::_sessionsMutex");
stdx::condition_variable _shutdownCondition;
SSMList _sessions;
size_t _maxNumConnections{DEFAULT_MAX_CONN};
AtomicWord<size_t> _currentConnections{0};
AtomicWord<size_t> _createdConnections{0};
std::unique_ptr<transport::ServiceExecutorReserved> _adminInternalPool;
};
/*
* Returns true if a session with remote/local addresses should be exempted from maxConns
*/
bool shouldOverrideMaxConns(const transport::SessionHandle& session,
const std::vector<stdx::variant<CIDR, std::string>>& exemptions);
} // namespace mongo
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