138 lines
2.7 KiB
C++
138 lines
2.7 KiB
C++
//
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// async_tcp_echo_server.cpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <cstdlib>
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#include <iostream>
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#include <boost/bind.hpp>
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#include <boost/asio.hpp>
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using boost::asio::ip::tcp;
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class session
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{
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public:
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session(boost::asio::io_context& io_context)
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: socket_(io_context)
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{
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}
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tcp::socket& socket()
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{
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return socket_;
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}
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void start()
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{
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socket_.async_read_some(boost::asio::buffer(data_, max_length),
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boost::bind(&session::handle_read, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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}
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private:
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void handle_read(const boost::system::error_code& error,
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size_t bytes_transferred)
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{
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if (!error)
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{
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boost::asio::async_write(socket_,
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boost::asio::buffer(data_, bytes_transferred),
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boost::bind(&session::handle_write, this,
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boost::asio::placeholders::error));
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}
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else
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{
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delete this;
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}
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}
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void handle_write(const boost::system::error_code& error)
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{
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if (!error)
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{
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socket_.async_read_some(boost::asio::buffer(data_, max_length),
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boost::bind(&session::handle_read, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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}
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else
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{
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delete this;
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}
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}
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tcp::socket socket_;
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enum { max_length = 1024 };
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char data_[max_length];
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};
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class server
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{
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public:
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server(boost::asio::io_context& io_context, short port)
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: io_context_(io_context),
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acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
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{
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start_accept();
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}
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private:
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void start_accept()
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{
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session* new_session = new session(io_context_);
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acceptor_.async_accept(new_session->socket(),
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boost::bind(&server::handle_accept, this, new_session,
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boost::asio::placeholders::error));
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}
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void handle_accept(session* new_session,
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const boost::system::error_code& error)
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{
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if (!error)
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{
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new_session->start();
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}
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else
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{
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delete new_session;
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}
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start_accept();
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}
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boost::asio::io_context& io_context_;
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tcp::acceptor acceptor_;
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};
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: async_tcp_echo_server <port>\n";
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return 1;
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}
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boost::asio::io_context io_context;
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using namespace std; // For atoi.
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server s(io_context, atoi(argv[1]));
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io_context.run();
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}
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catch (std::exception& e)
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{
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std::cerr << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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