ceph/src/boost/libs/asio/example/cpp17/coroutines_ts/echo_server.cpp

   1 //
   2 // echo_server.cpp
   3 // ~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   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)
   9 //
  10
  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>
  17 #include <cstdio>
  18
  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;
  24 namespace this_coro = boost::asio::this_coro;
  25
  26 #if defined(BOOST_ASIO_ENABLE_HANDLER_TRACKING)
  27 # define use_awaitable \
  28   boost::asio::use_awaitable_t(__FILE__, __LINE__, __PRETTY_FUNCTION__)
  29 #endif
  30
  31 awaitable<void> echo(tcp::socket socket)
  32 {
  33   try
  34   {
  35     char data[1024];
  36     for (;;)
  37     {
  38       std::size_t n = co_await socket.async_read_some(boost::asio::buffer(data), use_awaitable);
  39       co_await async_write(socket, boost::asio::buffer(data, n), use_awaitable);
  40     }
  41   }
  42   catch (std::exception& e)
  43   {
  44     std::printf("echo Exception: %s\n", e.what());
  45   }
  46 }
  47
  48 awaitable<void> listener()
  49 {
  50   auto executor = co_await this_coro::executor;
  51   tcp::acceptor acceptor(executor, {tcp::v4(), 55555});
  52   for (;;)
  53   {
  54     tcp::socket socket = co_await acceptor.async_accept(use_awaitable);
  55     co_spawn(executor, echo(std::move(socket)), detached);
  56   }
  57 }
  58
  59 int main()
  60 {
  61   try
  62   {
  63     boost::asio::io_context io_context(1);
  64
  65     boost::asio::signal_set signals(io_context, SIGINT, SIGTERM);
  66     signals.async_wait([&](auto, auto){ io_context.stop(); });
  67
  68     co_spawn(io_context, listener(), detached);
  69
  70     io_context.run();
  71   }
  72   catch (std::exception& e)
  73   {
  74     std::printf("Exception: %s\n", e.what());
  75   }
  76 }