SocketMgr.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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 GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef SocketMgr_h__
#define SocketMgr_h__

#include "AsyncAcceptor.h"
#include "Errors.h"
#include "NetworkThread.h"
#include <boost/asio/ip/tcp.hpp>
#include <memory>

using boost::asio::ip::tcp;

template<class SocketType>
class SocketMgr
{
public:
 virtual ~SocketMgr()
 {
 ASSERT(!_threads && !_acceptor && !_threadCount, "StopNetwork must be called prior to SocketMgr destruction");
 }

 virtual bool StartNetwork(boost::asio::io_service& service, std::string const& bindIp, uint16 port, int threadCount)
 {
 ASSERT(threadCount > 0);

 try
 {
 _acceptor = new AsyncAcceptor(service, bindIp, port);
 }
 catch (boost::system::system_error const& err)
 {
 TC_LOG_ERROR("network", "Exception caught in SocketMgr.StartNetwork (%s:%u): %s", bindIp.c_str(), port, err.what());
 return false;
 }

 _threadCount = threadCount;
 _threads = CreateThreads();

 ASSERT(_threads);

 for (int32 i = 0; i < _threadCount; ++i)
 _threads[i].Start();

 return true;
 }

 virtual void StopNetwork()
 {
 _acceptor->Close();

 if (_threadCount != 0)
 for (int32 i = 0; i < _threadCount; ++i)
 _threads[i].Stop();

 Wait();

 delete _acceptor;
 _acceptor = nullptr;
 delete[] _threads;
 _threads = nullptr;
 _threadCount = 0;
 }

 void Wait()
 {
 if (_threadCount != 0)
 for (int32 i = 0; i < _threadCount; ++i)
 _threads[i].Wait();
 }

 virtual void OnSocketOpen(tcp::socket&& sock, uint32 threadIndex)
 {
 try
 {
 std::shared_ptr<SocketType> newSocket = std::make_shared<SocketType>(std::move(sock));
 newSocket->Start();

 _threads[threadIndex].AddSocket(newSocket);
 }
 catch (boost::system::system_error const& err)
 {
 TC_LOG_WARN("network", "Failed to retrieve client's remote address %s", err.what());
 }
 }

 int32 GetNetworkThreadCount() const { return _threadCount; }

 uint32 SelectThreadWithMinConnections() const
 {
 uint32 min = 0;

 for (int32 i = 1; i < _threadCount; ++i)
 if (_threads[i].GetConnectionCount() < _threads[min].GetConnectionCount())
 min = i;

 return min;
 }

 std::pair<tcp::socket*, uint32> GetSocketForAccept()
 {
 uint32 threadIndex = SelectThreadWithMinConnections();
 return std::make_pair(_threads[threadIndex].GetSocketForAccept(), threadIndex);
 }

protected:
 SocketMgr() : _acceptor(nullptr), _threads(nullptr), _threadCount(1)
 {
 }

 virtual NetworkThread<SocketType>* CreateThreads() const = 0;

 AsyncAcceptor* _acceptor;
 NetworkThread<SocketType>* _threads;
 int32 _threadCount;
};

#endif // SocketMgr_h__