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- //
- // chat_client.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 <cstdlib>
- #include <deque>
- #include <iostream>
- #include <thread>
- #include <boost/asio.hpp>
- #include "chat_message.hpp"
- using boost::asio::ip::tcp;
- typedef std::deque<chat_message> chat_message_queue;
- class chat_client
- {
- public:
- chat_client(boost::asio::io_context& io_context,
- const tcp::resolver::results_type& endpoints)
- : io_context_(io_context),
- socket_(io_context)
- {
- do_connect(endpoints);
- }
- void write(const chat_message& msg)
- {
- boost::asio::post(io_context_,
- [this, msg]()
- {
- bool write_in_progress = !write_msgs_.empty();
- write_msgs_.push_back(msg);
- if (!write_in_progress)
- {
- do_write();
- }
- });
- }
- void close()
- {
- boost::asio::post(io_context_, [this]() { socket_.close(); });
- }
- private:
- void do_connect(const tcp::resolver::results_type& endpoints)
- {
- boost::asio::async_connect(socket_, endpoints,
- [this](boost::system::error_code ec, tcp::endpoint)
- {
- if (!ec)
- {
- do_read_header();
- }
- });
- }
- void do_read_header()
- {
- boost::asio::async_read(socket_,
- boost::asio::buffer(read_msg_.data(), chat_message::header_length),
- [this](boost::system::error_code ec, std::size_t /*length*/)
- {
- if (!ec && read_msg_.decode_header())
- {
- do_read_body();
- }
- else
- {
- socket_.close();
- }
- });
- }
- void do_read_body()
- {
- boost::asio::async_read(socket_,
- boost::asio::buffer(read_msg_.body(), read_msg_.body_length()),
- [this](boost::system::error_code ec, std::size_t /*length*/)
- {
- if (!ec)
- {
- std::cout.write(read_msg_.body(), read_msg_.body_length());
- std::cout << "\n";
- do_read_header();
- }
- else
- {
- socket_.close();
- }
- });
- }
- void do_write()
- {
- boost::asio::async_write(socket_,
- boost::asio::buffer(write_msgs_.front().data(),
- write_msgs_.front().length()),
- [this](boost::system::error_code ec, std::size_t /*length*/)
- {
- if (!ec)
- {
- write_msgs_.pop_front();
- if (!write_msgs_.empty())
- {
- do_write();
- }
- }
- else
- {
- socket_.close();
- }
- });
- }
- private:
- boost::asio::io_context& io_context_;
- tcp::socket socket_;
- chat_message read_msg_;
- chat_message_queue write_msgs_;
- };
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 3)
- {
- std::cerr << "Usage: chat_client <host> <port>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- tcp::resolver resolver(io_context);
- auto endpoints = resolver.resolve(argv[1], argv[2]);
- chat_client c(io_context, endpoints);
- std::thread t([&io_context](){ io_context.run(); });
- char line[chat_message::max_body_length + 1];
- while (std::cin.getline(line, chat_message::max_body_length + 1))
- {
- chat_message msg;
- msg.body_length(std::strlen(line));
- std::memcpy(msg.body(), line, msg.body_length());
- msg.encode_header();
- c.write(msg);
- }
- c.close();
- t.join();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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