2 // echo_server_with_default.cpp
3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5 // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
11 #include <boost/asio/co_spawn.hpp>
12 #include <boost/asio/detached.hpp>
13 #include <boost/asio/io_context.hpp>
14 #include <boost/asio/ip/tcp.hpp>
15 #include <boost/asio/signal_set.hpp>
16 #include <boost/asio/write.hpp>
19 using boost::asio::ip::tcp;
20 using boost::asio::awaitable;
21 using boost::asio::co_spawn;
22 using boost::asio::detached;
23 using boost::asio::use_awaitable_t;
24 using tcp_acceptor = use_awaitable_t<>::as_default_on_t<tcp::acceptor>;
25 using tcp_socket = use_awaitable_t<>::as_default_on_t<tcp::socket>;
26 namespace this_coro = boost::asio::this_coro;
28 awaitable<void> echo(tcp_socket socket)
35 std::size_t n = co_await socket.async_read_some(boost::asio::buffer(data));
36 co_await async_write(socket, boost::asio::buffer(data, n));
39 catch (std::exception& e)
41 std::printf("echo Exception: %s\n", e.what());
45 awaitable<void> listener()
47 auto executor = co_await this_coro::executor;
48 tcp_acceptor acceptor(executor, {tcp::v4(), 55555});
51 auto socket = co_await acceptor.async_accept();
53 [socket = std::move(socket)]() mutable
55 return echo(std::move(socket));
65 boost::asio::io_context io_context(1);
67 boost::asio::signal_set signals(io_context, SIGINT, SIGTERM);
68 signals.async_wait([&](auto, auto){ io_context.stop(); });
70 co_spawn(io_context, listener, detached);
74 catch (std::exception& e)
76 std::printf("Exception: %s\n", e.what());