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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 <iostream>
- #include <memory>
- using boost::asio::ip::tcp;
- class session : public std::enable_shared_from_this<session>
- {
- public:
- explicit session(boost::asio::io_context& io_context, tcp::socket socket)
- : socket_(std::move(socket)),
- timer_(io_context),
- strand_(io_context.get_executor())
- {
- }
- void go()
- {
- auto self(shared_from_this());
- boost::asio::spawn(strand_,
- [this, self](boost::asio::yield_context yield)
- {
- try
- {
- char data[128];
- for (;;)
- {
- timer_.expires_from_now(std::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();
- }
- });
- boost::asio::spawn(strand_,
- [this, self](boost::asio::yield_context yield)
- {
- while (socket_.is_open())
- {
- boost::system::error_code ignored_ec;
- timer_.async_wait(yield[ignored_ec]);
- if (timer_.expires_from_now() <= std::chrono::seconds(0))
- socket_.close();
- }
- });
- }
- private:
- tcp::socket socket_;
- boost::asio::steady_timer timer_;
- boost::asio::strand<boost::asio::io_context::executor_type> strand_;
- };
- 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::asio::yield_context yield)
- {
- tcp::acceptor acceptor(io_context,
- tcp::endpoint(tcp::v4(), std::atoi(argv[1])));
- for (;;)
- {
- boost::system::error_code ec;
- tcp::socket socket(io_context);
- acceptor.async_accept(socket, yield[ec]);
- if (!ec)
- {
- std::make_shared<session>(io_context, std::move(socket))->go();
- }
- }
- });
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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