| // |
| // chat_client.cpp |
| // ~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 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 <boost/bind.hpp> |
| #include <boost/asio.hpp> |
| #include <boost/thread.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_service& io_service, |
| tcp::resolver::iterator endpoint_iterator) |
| : io_service_(io_service), |
| socket_(io_service) |
| { |
| tcp::endpoint endpoint = *endpoint_iterator; |
| socket_.async_connect(endpoint, |
| boost::bind(&chat_client::handle_connect, this, |
| boost::asio::placeholders::error, ++endpoint_iterator)); |
| } |
| |
| void write(const chat_message& msg) |
| { |
| io_service_.post(boost::bind(&chat_client::do_write, this, msg)); |
| } |
| |
| void close() |
| { |
| io_service_.post(boost::bind(&chat_client::do_close, this)); |
| } |
| |
| private: |
| |
| void handle_connect(const boost::system::error_code& error, |
| tcp::resolver::iterator endpoint_iterator) |
| { |
| if (!error) |
| { |
| boost::asio::async_read(socket_, |
| boost::asio::buffer(read_msg_.data(), chat_message::header_length), |
| boost::bind(&chat_client::handle_read_header, this, |
| boost::asio::placeholders::error)); |
| } |
| else if (endpoint_iterator != tcp::resolver::iterator()) |
| { |
| socket_.close(); |
| tcp::endpoint endpoint = *endpoint_iterator; |
| socket_.async_connect(endpoint, |
| boost::bind(&chat_client::handle_connect, this, |
| boost::asio::placeholders::error, ++endpoint_iterator)); |
| } |
| } |
| |
| void handle_read_header(const boost::system::error_code& error) |
| { |
| if (!error && read_msg_.decode_header()) |
| { |
| boost::asio::async_read(socket_, |
| boost::asio::buffer(read_msg_.body(), read_msg_.body_length()), |
| boost::bind(&chat_client::handle_read_body, this, |
| boost::asio::placeholders::error)); |
| } |
| else |
| { |
| do_close(); |
| } |
| } |
| |
| void handle_read_body(const boost::system::error_code& error) |
| { |
| if (!error) |
| { |
| std::cout.write(read_msg_.body(), read_msg_.body_length()); |
| std::cout << "\n"; |
| boost::asio::async_read(socket_, |
| boost::asio::buffer(read_msg_.data(), chat_message::header_length), |
| boost::bind(&chat_client::handle_read_header, this, |
| boost::asio::placeholders::error)); |
| } |
| else |
| { |
| do_close(); |
| } |
| } |
| |
| void do_write(chat_message msg) |
| { |
| bool write_in_progress = !write_msgs_.empty(); |
| write_msgs_.push_back(msg); |
| if (!write_in_progress) |
| { |
| boost::asio::async_write(socket_, |
| boost::asio::buffer(write_msgs_.front().data(), |
| write_msgs_.front().length()), |
| boost::bind(&chat_client::handle_write, this, |
| boost::asio::placeholders::error)); |
| } |
| } |
| |
| void handle_write(const boost::system::error_code& error) |
| { |
| if (!error) |
| { |
| write_msgs_.pop_front(); |
| if (!write_msgs_.empty()) |
| { |
| boost::asio::async_write(socket_, |
| boost::asio::buffer(write_msgs_.front().data(), |
| write_msgs_.front().length()), |
| boost::bind(&chat_client::handle_write, this, |
| boost::asio::placeholders::error)); |
| } |
| } |
| else |
| { |
| do_close(); |
| } |
| } |
| |
| void do_close() |
| { |
| socket_.close(); |
| } |
| |
| private: |
| boost::asio::io_service& io_service_; |
| 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_service io_service; |
| |
| tcp::resolver resolver(io_service); |
| tcp::resolver::query query(argv[1], argv[2]); |
| tcp::resolver::iterator iterator = resolver.resolve(query); |
| |
| chat_client c(io_service, iterator); |
| |
| boost::thread t(boost::bind(&boost::asio::io_service::run, &io_service)); |
| |
| char line[chat_message::max_body_length + 1]; |
| while (std::cin.getline(line, chat_message::max_body_length + 1)) |
| { |
| using namespace std; // For strlen and memcpy. |
| chat_message msg; |
| msg.body_length(strlen(line)); |
| 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; |
| } |