| // |
| // 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 <boost/asio/io_context.hpp> |
| #include <boost/asio/ip/tcp.hpp> |
| #include <boost/asio/spawn.hpp> |
| #include <boost/asio/steady_timer.hpp> |
| #include <boost/asio/write.hpp> |
| #include <iostream> |
| #include <memory> |
| |
| using boost::asio::ip::tcp; |
| |
| class session : public std::enable_shared_from_this<session> |
| { |
| public: |
| explicit session(boost::asio::io_context& io_context, tcp::socket socket) |
| : socket_(std::move(socket)), |
| timer_(io_context), |
| strand_(io_context.get_executor()) |
| { |
| } |
| |
| void go() |
| { |
| auto self(shared_from_this()); |
| boost::asio::spawn(strand_, |
| [this, self](boost::asio::yield_context yield) |
| { |
| try |
| { |
| char data[128]; |
| for (;;) |
| { |
| timer_.expires_from_now(std::chrono::seconds(10)); |
| std::size_t n = socket_.async_read_some(boost::asio::buffer(data), yield); |
| boost::asio::async_write(socket_, boost::asio::buffer(data, n), yield); |
| } |
| } |
| catch (std::exception& e) |
| { |
| socket_.close(); |
| timer_.cancel(); |
| } |
| }); |
| |
| boost::asio::spawn(strand_, |
| [this, self](boost::asio::yield_context yield) |
| { |
| while (socket_.is_open()) |
| { |
| boost::system::error_code ignored_ec; |
| timer_.async_wait(yield[ignored_ec]); |
| if (timer_.expires_from_now() <= std::chrono::seconds(0)) |
| socket_.close(); |
| } |
| }); |
| } |
| |
| private: |
| tcp::socket socket_; |
| boost::asio::steady_timer timer_; |
| boost::asio::strand<boost::asio::io_context::executor_type> strand_; |
| }; |
| |
| int main(int argc, char* argv[]) |
| { |
| try |
| { |
| if (argc != 2) |
| { |
| std::cerr << "Usage: echo_server <port>\n"; |
| return 1; |
| } |
| |
| boost::asio::io_context io_context; |
| |
| boost::asio::spawn(io_context, |
| [&](boost::asio::yield_context yield) |
| { |
| tcp::acceptor acceptor(io_context, |
| tcp::endpoint(tcp::v4(), std::atoi(argv[1]))); |
| |
| for (;;) |
| { |
| boost::system::error_code ec; |
| tcp::socket socket(io_context); |
| acceptor.async_accept(socket, yield[ec]); |
| if (!ec) |
| { |
| std::make_shared<session>(io_context, std::move(socket))->go(); |
| } |
| } |
| }); |
| |
| io_context.run(); |
| } |
| catch (std::exception& e) |
| { |
| std::cerr << "Exception: " << e.what() << "\n"; |
| } |
| |
| return 0; |
| } |