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/*
* This file is part of the TrinityCore 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 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 TRINITYCORE_ASYNC_ACCEPTOR_H
#define TRINITYCORE_ASYNC_ACCEPTOR_H
#include "IoContext.h"
#include "IpAddress.h"
#include "Log.h"
#include "Socket.h"
#include <boost/asio/ip/tcp.hpp>
#include <boost/asio/ip/v6_only.hpp>
#include <atomic>
#include <functional>
#define TRINITY_MAX_LISTEN_CONNECTIONS boost::asio::socket_base::max_listen_connections
namespace Trinity::Net
{
template <typename Callable>
concept AcceptCallback = std::invocable<Callable, IoContextTcpSocket&&, uint32>;
class AsyncAcceptor
{
public:
AsyncAcceptor(Asio::IoContext& ioContext, std::string const& bindIp, uint16 port) :
_acceptor(ioContext), _endpoint(make_address(bindIp), port),
_socket(ioContext), _closed(false), _socketFactory([this] { return DefaultSocketFactory(); })
{
}
template <AcceptCallback Callback>
void AsyncAccept(Callback&& acceptCallback)
{
auto [tmpSocket, tmpThreadIndex] = _socketFactory();
// TODO: get rid of temporary variables (clang 15 cannot handle variables from structured bindings as lambda captures)
IoContextTcpSocket* socket = tmpSocket;
uint32 threadIndex = tmpThreadIndex;
_acceptor.async_accept(*socket, [this, socket, threadIndex, acceptCallback = std::forward<Callback>(acceptCallback)](boost::system::error_code const& error) mutable
{
if (!error)
{
try
{
socket->non_blocking(true);
acceptCallback(std::move(*socket), threadIndex);
}
catch (boost::system::system_error const& err)
{
TC_LOG_INFO("network", "Failed to initialize client's socket {}", err.what());
}
}
if (!_closed)
this->AsyncAccept(std::move(acceptCallback));
});
}
bool Bind()
{
boost::system::error_code errorCode;
_acceptor.open(_endpoint.protocol(), errorCode);
if (errorCode)
{
TC_LOG_INFO("network", "Failed to open acceptor {}", errorCode.message());
return false;
}
#if TRINITY_PLATFORM != TRINITY_PLATFORM_WINDOWS
_acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true), errorCode);
if (errorCode)
{
TC_LOG_INFO("network", "Failed to set reuse_address option on acceptor {}", errorCode.message());
return false;
}
#endif
// v6_only is enabled on some *BSD distributions by default
// we want to allow both v4 and v6 connections to the same listener
if (_endpoint.protocol() == boost::asio::ip::tcp::v6())
_acceptor.set_option(boost::asio::ip::v6_only(false));
_acceptor.bind(_endpoint, errorCode);
if (errorCode)
{
TC_LOG_INFO("network", "Could not bind to {}:{} {}", _endpoint.address(), _endpoint.port(), errorCode.message());
return false;
}
_acceptor.listen(TRINITY_MAX_LISTEN_CONNECTIONS, errorCode);
if (errorCode)
{
TC_LOG_INFO("network", "Failed to start listening on {}:{} {}", _endpoint.address(), _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<IoContextTcpSocket*, uint32>()> func) { _socketFactory = std::move(func); }
private:
std::pair<IoContextTcpSocket*, uint32> DefaultSocketFactory() { return std::make_pair(&_socket, 0); }
boost::asio::basic_socket_acceptor<boost::asio::ip::tcp, IoContextTcpSocket::executor_type> _acceptor;
boost::asio::ip::tcp::endpoint _endpoint;
IoContextTcpSocket _socket;
std::atomic<bool> _closed;
std::function<std::pair<IoContextTcpSocket*, uint32>()> _socketFactory;
};
}
#endif // TRINITYCORE_ASYNC_ACCEPTOR_H
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