123 lines
2.8 KiB
C++
123 lines
2.8 KiB
C++
//
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// 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 <boost/asio/io_context.hpp>
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#include <boost/asio/ip/tcp.hpp>
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#include <boost/asio/spawn.hpp>
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#include <boost/asio/steady_timer.hpp>
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#include <boost/asio/write.hpp>
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#include <boost/bind.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/enable_shared_from_this.hpp>
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#include <iostream>
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using boost::asio::ip::tcp;
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class session : public boost::enable_shared_from_this<session>
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{
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public:
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explicit session(boost::asio::io_context& io_context)
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: strand_(boost::asio::make_strand(io_context)),
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socket_(io_context),
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timer_(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 go()
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{
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boost::asio::spawn(strand_,
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boost::bind(&session::echo,
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shared_from_this(), _1));
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boost::asio::spawn(strand_,
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boost::bind(&session::timeout,
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shared_from_this(), _1));
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}
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private:
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void echo(boost::asio::yield_context yield)
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{
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try
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{
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char data[128];
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for (;;)
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{
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timer_.expires_after(boost::asio::chrono::seconds(10));
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std::size_t n = socket_.async_read_some(boost::asio::buffer(data), yield);
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boost::asio::async_write(socket_, boost::asio::buffer(data, n), yield);
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}
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}
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catch (std::exception& e)
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{
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socket_.close();
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timer_.cancel();
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}
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}
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void timeout(boost::asio::yield_context yield)
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{
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while (socket_.is_open())
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{
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boost::system::error_code ignored_ec;
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timer_.async_wait(yield[ignored_ec]);
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if (timer_.expiry() <= boost::asio::steady_timer::clock_type::now())
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socket_.close();
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}
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}
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boost::asio::strand<boost::asio::io_context::executor_type> strand_;
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tcp::socket socket_;
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boost::asio::steady_timer timer_;
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};
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void do_accept(boost::asio::io_context& io_context,
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unsigned short port, boost::asio::yield_context yield)
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{
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tcp::acceptor acceptor(io_context, tcp::endpoint(tcp::v4(), port));
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for (;;)
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{
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boost::system::error_code ec;
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boost::shared_ptr<session> new_session(new session(io_context));
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acceptor.async_accept(new_session->socket(), yield[ec]);
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if (!ec) new_session->go();
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}
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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: 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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boost::asio::spawn(io_context,
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boost::bind(do_accept,
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boost::ref(io_context), atoi(argv[1]), _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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