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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation; either version 3 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 Affero 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 __ASYNCACCEPT_H_
#define __ASYNCACCEPT_H_
#include "IpAddress.h"
#include "Log.h"
#include <atomic>
#include <boost/asio/ip/tcp.hpp>
#include <functional>
using boost::asio::ip::tcp;
constexpr auto ACORE_MAX_LISTEN_CONNECTIONS = boost::asio::socket_base::max_listen_connections;
class AsyncAcceptor
{
public:
typedef void(*AcceptCallback)(tcp::socket&& newSocket, uint32 threadIndex);
AsyncAcceptor(Acore::Asio::IoContext& ioContext, std::string const& bindIp, uint16 port) :
_acceptor(ioContext), _endpoint(Acore::Net::make_address(bindIp), port),
_socket(ioContext), _closed(false), _socketFactory([this](){ return DefaultSocketFactory(); })
{
}
template<class T>
void AsyncAccept();
template<AcceptCallback acceptCallback>
void AsyncAcceptWithCallback()
{
tcp::socket* socket;
uint32 threadIndex;
std::tie(socket, threadIndex) = _socketFactory();
_acceptor.async_accept(*socket, [this, socket, threadIndex](boost::system::error_code error)
{
if (!error)
{
try
{
socket->non_blocking(true);
acceptCallback(std::move(*socket), threadIndex);
}
catch (boost::system::system_error const& err)
{
LOG_INFO("network", "Failed to initialize client's socket {}", err.what());
}
}
if (!_closed)
this->AsyncAcceptWithCallback<acceptCallback>();
});
}
bool Bind()
{
boost::system::error_code errorCode;
_acceptor.open(_endpoint.protocol(), errorCode);
if (errorCode)
{
LOG_INFO("network", "Failed to open acceptor {}", errorCode.message());
return false;
}
#if AC_PLATFORM != AC_PLATFORM_WINDOWS
_acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true), errorCode);
if (errorCode)
{
LOG_INFO("network", "Failed to set reuse_address option on acceptor {}", errorCode.message());
return false;
}
#endif
_acceptor.bind(_endpoint, errorCode);
if (errorCode)
{
LOG_INFO("network", "Could not bind to {}:{} {}", _endpoint.address().to_string(), _endpoint.port(), errorCode.message());
return false;
}
_acceptor.listen(ACORE_MAX_LISTEN_CONNECTIONS, errorCode);
if (errorCode)
{
LOG_INFO("network", "Failed to start listening on {}:{} {}", _endpoint.address().to_string(), _endpoint.port(), errorCode.message());
return false;
}
return true;
}
void Close()
{
if (_closed.exchange(true))
return;
boost::system::error_code err;
_acceptor.close(err);
}
void SetSocketFactory(std::function<std::pair<tcp::socket*, uint32>()> func) { _socketFactory = func; }
private:
std::pair<tcp::socket*, uint32> DefaultSocketFactory() { return std::make_pair(&_socket, 0); }
tcp::acceptor _acceptor;
tcp::endpoint _endpoint;
tcp::socket _socket;
std::atomic<bool> _closed;
std::function<std::pair<tcp::socket*, uint32>()> _socketFactory;
};
template<class T>
void AsyncAcceptor::AsyncAccept()
{
_acceptor.async_accept(_socket, [this](boost::system::error_code error)
{
if (!error)
{
try
{
// this-> is required here to fix an segmentation fault in gcc 4.7.2 - reason is lambdas in a templated class
std::make_shared<T>(std::move(this->_socket))->Start();
}
catch (boost::system::system_error const& err)
{
LOG_INFO("network", "Failed to retrieve client's remote address {}", err.what());
}
}
// lets slap some more this-> on this so we can fix this bug with gcc 4.7.2 throwing internals in yo face
if (!_closed)
this->AsyncAccept<T>();
});
}
#endif /* __ASYNC ACCEPT_H_ */
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