| // |
| // async_tcp_echo_server.cpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| // |
| |
| #include <cstdlib> |
| #include <iostream> |
| #include <memory> |
| #include <utility> |
| #include "asio.hpp" |
| |
| using asio::ip::tcp; |
| |
| class session |
| : public std::enable_shared_from_this<session> |
| { |
| public: |
| session(tcp::socket socket) |
| : socket_(std::move(socket)) |
| { |
| } |
| |
| void start() |
| { |
| do_read(); |
| } |
| |
| private: |
| void do_read() |
| { |
| auto self(shared_from_this()); |
| socket_.async_read_some(asio::buffer(data_, max_length), |
| [this, self](std::error_code ec, std::size_t length) |
| { |
| if (!ec) |
| { |
| do_write(length); |
| } |
| }); |
| } |
| |
| void do_write(std::size_t length) |
| { |
| auto self(shared_from_this()); |
| asio::async_write(socket_, asio::buffer(data_, length), |
| [this, self](std::error_code ec, std::size_t /*length*/) |
| { |
| if (!ec) |
| { |
| do_read(); |
| } |
| }); |
| } |
| |
| tcp::socket socket_; |
| enum { max_length = 1024 }; |
| char data_[max_length]; |
| }; |
| |
| class server |
| { |
| public: |
| server(asio::io_context& io_context, short port) |
| : acceptor_(io_context, tcp::endpoint(tcp::v4(), port)) |
| { |
| do_accept(); |
| } |
| |
| private: |
| void do_accept() |
| { |
| acceptor_.async_accept( |
| [this](std::error_code ec, tcp::socket socket) |
| { |
| if (!ec) |
| { |
| std::make_shared<session>(std::move(socket))->start(); |
| } |
| |
| do_accept(); |
| }); |
| } |
| |
| tcp::acceptor acceptor_; |
| }; |
| |
| int main(int argc, char* argv[]) |
| { |
| try |
| { |
| if (argc != 2) |
| { |
| std::cerr << "Usage: async_tcp_echo_server <port>\n"; |
| return 1; |
| } |
| |
| asio::io_context io_context; |
| |
| server s(io_context, std::atoi(argv[1])); |
| |
| io_context.run(); |
| } |
| catch (std::exception& e) |
| { |
| std::cerr << "Exception: " << e.what() << "\n"; |
| } |
| |
| return 0; |
| } |