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- //
- // chat_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 <algorithm>
- #include <cstdlib>
- #include <deque>
- #include <iostream>
- #include <list>
- #include <set>
- #include <boost/bind.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/enable_shared_from_this.hpp>
- #include <boost/asio.hpp>
- #include "chat_message.hpp"
- using boost::asio::ip::tcp;
- //----------------------------------------------------------------------
- typedef std::deque<chat_message> chat_message_queue;
- //----------------------------------------------------------------------
- class chat_participant
- {
- public:
- virtual ~chat_participant() {}
- virtual void deliver(const chat_message& msg) = 0;
- };
- typedef boost::shared_ptr<chat_participant> chat_participant_ptr;
- //----------------------------------------------------------------------
- class chat_room
- {
- public:
- void join(chat_participant_ptr participant)
- {
- participants_.insert(participant);
- std::for_each(recent_msgs_.begin(), recent_msgs_.end(),
- boost::bind(&chat_participant::deliver, participant, _1));
- }
- void leave(chat_participant_ptr participant)
- {
- participants_.erase(participant);
- }
- void deliver(const chat_message& msg)
- {
- recent_msgs_.push_back(msg);
- while (recent_msgs_.size() > max_recent_msgs)
- recent_msgs_.pop_front();
- std::for_each(participants_.begin(), participants_.end(),
- boost::bind(&chat_participant::deliver, _1, boost::ref(msg)));
- }
- private:
- std::set<chat_participant_ptr> participants_;
- enum { max_recent_msgs = 100 };
- chat_message_queue recent_msgs_;
- };
- //----------------------------------------------------------------------
- class chat_session
- : public chat_participant,
- public boost::enable_shared_from_this<chat_session>
- {
- public:
- chat_session(boost::asio::io_context& io_context, chat_room& room)
- : socket_(io_context),
- room_(room)
- {
- }
- tcp::socket& socket()
- {
- return socket_;
- }
- void start()
- {
- room_.join(shared_from_this());
- boost::asio::async_read(socket_,
- boost::asio::buffer(read_msg_.data(), chat_message::header_length),
- boost::bind(
- &chat_session::handle_read_header, shared_from_this(),
- boost::asio::placeholders::error));
- }
- void deliver(const 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_session::handle_write, shared_from_this(),
- boost::asio::placeholders::error));
- }
- }
- 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_session::handle_read_body, shared_from_this(),
- boost::asio::placeholders::error));
- }
- else
- {
- room_.leave(shared_from_this());
- }
- }
- void handle_read_body(const boost::system::error_code& error)
- {
- if (!error)
- {
- room_.deliver(read_msg_);
- boost::asio::async_read(socket_,
- boost::asio::buffer(read_msg_.data(), chat_message::header_length),
- boost::bind(&chat_session::handle_read_header, shared_from_this(),
- boost::asio::placeholders::error));
- }
- else
- {
- room_.leave(shared_from_this());
- }
- }
- 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_session::handle_write, shared_from_this(),
- boost::asio::placeholders::error));
- }
- }
- else
- {
- room_.leave(shared_from_this());
- }
- }
- private:
- tcp::socket socket_;
- chat_room& room_;
- chat_message read_msg_;
- chat_message_queue write_msgs_;
- };
- typedef boost::shared_ptr<chat_session> chat_session_ptr;
- //----------------------------------------------------------------------
- class chat_server
- {
- public:
- chat_server(boost::asio::io_context& io_context,
- const tcp::endpoint& endpoint)
- : io_context_(io_context),
- acceptor_(io_context, endpoint)
- {
- start_accept();
- }
- void start_accept()
- {
- chat_session_ptr new_session(new chat_session(io_context_, room_));
- acceptor_.async_accept(new_session->socket(),
- boost::bind(&chat_server::handle_accept, this, new_session,
- boost::asio::placeholders::error));
- }
- void handle_accept(chat_session_ptr session,
- const boost::system::error_code& error)
- {
- if (!error)
- {
- session->start();
- }
- start_accept();
- }
- private:
- boost::asio::io_context& io_context_;
- tcp::acceptor acceptor_;
- chat_room room_;
- };
- typedef boost::shared_ptr<chat_server> chat_server_ptr;
- typedef std::list<chat_server_ptr> chat_server_list;
- //----------------------------------------------------------------------
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc < 2)
- {
- std::cerr << "Usage: chat_server <port> [<port> ...]\n";
- return 1;
- }
- boost::asio::io_context io_context;
- chat_server_list servers;
- for (int i = 1; i < argc; ++i)
- {
- using namespace std; // For atoi.
- tcp::endpoint endpoint(tcp::v4(), atoi(argv[i]));
- chat_server_ptr server(new chat_server(io_context, endpoint));
- servers.push_back(server);
- }
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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