baca9a092f
The awaitable<>, co_spawn(), this_coro, detached, and redirect_error facilities have been moved from the asio::experimental namespace to namespace asio. As part of this change, the this_coro::token() awaitable has been superseded by the asio::use_awaitable completion token. Please note that the use_awaitable and redirect_error completion tokens work only with asynchronous operations that use the new form of async_result with member function initiate(). Furthermore, when using use_awaitable, please be aware that the asynchronous operation is not initiated until co_await is applied to the awaitable<>.
77 lines
1.8 KiB
C++
77 lines
1.8 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/co_spawn.hpp>
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#include <boost/asio/detached.hpp>
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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/signal_set.hpp>
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#include <boost/asio/write.hpp>
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#include <cstdio>
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using boost::asio::ip::tcp;
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using boost::asio::awaitable;
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using boost::asio::co_spawn;
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using boost::asio::detached;
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using boost::asio::use_awaitable;
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namespace this_coro = boost::asio::this_coro;
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awaitable<void> echo(tcp::socket socket)
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{
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try
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{
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char data[1024];
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for (;;)
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{
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std::size_t n = co_await socket.async_read_some(boost::asio::buffer(data), use_awaitable);
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co_await async_write(socket, boost::asio::buffer(data, n), use_awaitable);
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}
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}
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catch (std::exception& e)
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{
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std::printf("echo Exception: %s\n", e.what());
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}
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}
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awaitable<void> listener()
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{
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auto executor = co_await this_coro::executor;
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tcp::acceptor acceptor(executor, {tcp::v4(), 55555});
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for (;;)
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{
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tcp::socket socket = co_await acceptor.async_accept(use_awaitable);
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co_spawn(executor,
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[socket = std::move(socket)]() mutable
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{
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return echo(std::move(socket));
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},
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detached);
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}
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}
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int main()
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{
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try
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{
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boost::asio::io_context io_context(1);
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boost::asio::signal_set signals(io_context, SIGINT, SIGTERM);
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signals.async_wait([&](auto, auto){ io_context.stop(); });
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co_spawn(io_context, listener, detached);
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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::printf("Exception: %s\n", e.what());
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}
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}
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