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- //
- // echo_server.cpp
- // ~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 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 <boost/bind.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/enable_shared_from_this.hpp>
- #include <iostream>
- using boost::asio::ip::tcp;
- class session : public boost::enable_shared_from_this<session>
- {
- public:
- explicit session(boost::asio::io_context& io_context)
- : strand_(boost::asio::make_strand(io_context)),
- socket_(io_context),
- timer_(io_context)
- {
- }
- tcp::socket& socket()
- {
- return socket_;
- }
- void go()
- {
- boost::asio::spawn(strand_,
- boost::bind(&session::echo,
- shared_from_this(), _1));
- boost::asio::spawn(strand_,
- boost::bind(&session::timeout,
- shared_from_this(), _1));
- }
- private:
- void echo(boost::asio::yield_context yield)
- {
- try
- {
- char data[128];
- for (;;)
- {
- timer_.expires_after(boost::asio::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();
- }
- }
- void timeout(boost::asio::yield_context yield)
- {
- while (socket_.is_open())
- {
- boost::system::error_code ignored_ec;
- timer_.async_wait(yield[ignored_ec]);
- if (timer_.expiry() <= boost::asio::steady_timer::clock_type::now())
- socket_.close();
- }
- }
- boost::asio::strand<boost::asio::io_context::executor_type> strand_;
- tcp::socket socket_;
- boost::asio::steady_timer timer_;
- };
- void do_accept(boost::asio::io_context& io_context,
- unsigned short port, boost::asio::yield_context yield)
- {
- tcp::acceptor acceptor(io_context, tcp::endpoint(tcp::v4(), port));
- for (;;)
- {
- boost::system::error_code ec;
- boost::shared_ptr<session> new_session(new session(io_context));
- acceptor.async_accept(new_session->socket(), yield[ec]);
- if (!ec) new_session->go();
- }
- }
- 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::bind(do_accept,
- boost::ref(io_context), atoi(argv[1]), _1));
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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