123 lines
2.5 KiB
C++
123 lines
2.5 KiB
C++
//
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// reference_counted.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.hpp>
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#include <iostream>
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#include <memory>
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#include <utility>
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#include <vector>
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#include <ctime>
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using boost::asio::ip::tcp;
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// A reference-counted non-modifiable buffer class.
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class shared_const_buffer
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{
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public:
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// Construct from a std::string.
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explicit shared_const_buffer(const std::string& data)
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: data_(new std::vector<char>(data.begin(), data.end())),
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buffer_(boost::asio::buffer(*data_))
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{
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}
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// Implement the ConstBufferSequence requirements.
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typedef boost::asio::const_buffer value_type;
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typedef const boost::asio::const_buffer* const_iterator;
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const boost::asio::const_buffer* begin() const { return &buffer_; }
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const boost::asio::const_buffer* end() const { return &buffer_ + 1; }
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private:
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std::shared_ptr<std::vector<char> > data_;
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boost::asio::const_buffer buffer_;
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};
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class session
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: public std::enable_shared_from_this<session>
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{
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public:
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session(tcp::socket socket)
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: socket_(std::move(socket))
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{
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}
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void start()
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{
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do_write();
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}
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private:
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void do_write()
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{
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std::time_t now = std::time(0);
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shared_const_buffer buffer(std::ctime(&now));
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auto self(shared_from_this());
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boost::asio::async_write(socket_, buffer,
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[self](boost::system::error_code /*ec*/, std::size_t /*length*/)
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{
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});
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}
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// The socket used to communicate with the client.
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tcp::socket socket_;
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};
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class server
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{
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public:
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server(boost::asio::io_context& io_context, short port)
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: acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
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{
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do_accept();
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}
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private:
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void do_accept()
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{
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acceptor_.async_accept(
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[this](boost::system::error_code ec, tcp::socket socket)
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{
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if (!ec)
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{
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std::make_shared<session>(std::move(socket))->start();
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}
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do_accept();
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});
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}
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tcp::acceptor acceptor_;
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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: reference_counted <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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server s(io_context, std::atoi(argv[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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