5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
17 #include <boost/bind.hpp>
18 #include <boost/shared_ptr.hpp>
19 #include <boost/enable_shared_from_this.hpp>
20 #include <boost/asio.hpp>
21 #include "chat_message.hpp"
23 using boost::asio::ip::tcp
;
25 //----------------------------------------------------------------------
27 typedef std::deque
<chat_message
> chat_message_queue
;
29 //----------------------------------------------------------------------
31 class chat_participant
34 virtual ~chat_participant() {}
35 virtual void deliver(const chat_message
& msg
) = 0;
38 typedef boost::shared_ptr
<chat_participant
> chat_participant_ptr
;
40 //----------------------------------------------------------------------
45 void join(chat_participant_ptr participant
)
47 participants_
.insert(participant
);
48 std::for_each(recent_msgs_
.begin(), recent_msgs_
.end(),
49 boost::bind(&chat_participant::deliver
, participant
, _1
));
52 void leave(chat_participant_ptr participant
)
54 participants_
.erase(participant
);
57 void deliver(const chat_message
& msg
)
59 recent_msgs_
.push_back(msg
);
60 while (recent_msgs_
.size() > max_recent_msgs
)
61 recent_msgs_
.pop_front();
63 std::for_each(participants_
.begin(), participants_
.end(),
64 boost::bind(&chat_participant::deliver
, _1
, boost::ref(msg
)));
68 std::set
<chat_participant_ptr
> participants_
;
69 enum { max_recent_msgs
= 100 };
70 chat_message_queue recent_msgs_
;
73 //----------------------------------------------------------------------
76 : public chat_participant
,
77 public boost::enable_shared_from_this
<chat_session
>
80 chat_session(boost::asio::io_service
& io_service
, chat_room
& room
)
81 : socket_(io_service
),
93 room_
.join(shared_from_this());
94 boost::asio::async_read(socket_
,
95 boost::asio::buffer(read_msg_
.data(), chat_message::header_length
),
97 &chat_session::handle_read_header
, shared_from_this(),
98 boost::asio::placeholders::error
));
101 void deliver(const chat_message
& msg
)
103 bool write_in_progress
= !write_msgs_
.empty();
104 write_msgs_
.push_back(msg
);
105 if (!write_in_progress
)
107 boost::asio::async_write(socket_
,
108 boost::asio::buffer(write_msgs_
.front().data(),
109 write_msgs_
.front().length()),
110 boost::bind(&chat_session::handle_write
, shared_from_this(),
111 boost::asio::placeholders::error
));
115 void handle_read_header(const boost::system::error_code
& error
)
117 if (!error
&& read_msg_
.decode_header())
119 boost::asio::async_read(socket_
,
120 boost::asio::buffer(read_msg_
.body(), read_msg_
.body_length()),
121 boost::bind(&chat_session::handle_read_body
, shared_from_this(),
122 boost::asio::placeholders::error
));
126 room_
.leave(shared_from_this());
130 void handle_read_body(const boost::system::error_code
& error
)
134 room_
.deliver(read_msg_
);
135 boost::asio::async_read(socket_
,
136 boost::asio::buffer(read_msg_
.data(), chat_message::header_length
),
137 boost::bind(&chat_session::handle_read_header
, shared_from_this(),
138 boost::asio::placeholders::error
));
142 room_
.leave(shared_from_this());
146 void handle_write(const boost::system::error_code
& error
)
150 write_msgs_
.pop_front();
151 if (!write_msgs_
.empty())
153 boost::asio::async_write(socket_
,
154 boost::asio::buffer(write_msgs_
.front().data(),
155 write_msgs_
.front().length()),
156 boost::bind(&chat_session::handle_write
, shared_from_this(),
157 boost::asio::placeholders::error
));
162 room_
.leave(shared_from_this());
169 chat_message read_msg_
;
170 chat_message_queue write_msgs_
;
173 typedef boost::shared_ptr
<chat_session
> chat_session_ptr
;
175 //----------------------------------------------------------------------
180 chat_server(boost::asio::io_service
& io_service
,
181 const tcp::endpoint
& endpoint
)
182 : io_service_(io_service
),
183 acceptor_(io_service
, endpoint
)
190 chat_session_ptr
new_session(new chat_session(io_service_
, room_
));
191 acceptor_
.async_accept(new_session
->socket(),
192 boost::bind(&chat_server::handle_accept
, this, new_session
,
193 boost::asio::placeholders::error
));
196 void handle_accept(chat_session_ptr session
,
197 const boost::system::error_code
& error
)
208 boost::asio::io_service
& io_service_
;
209 tcp::acceptor acceptor_
;
213 typedef boost::shared_ptr
<chat_server
> chat_server_ptr
;
214 typedef std::list
<chat_server_ptr
> chat_server_list
;
216 //----------------------------------------------------------------------
218 int main(int argc
, char* argv
[])
224 std::cerr
<< "Usage: chat_server <port> [<port> ...]\n";
228 boost::asio::io_service io_service
;
230 chat_server_list servers
;
231 for (int i
= 1; i
< argc
; ++i
)
233 using namespace std
; // For atoi.
234 tcp::endpoint
endpoint(tcp::v4(), atoi(argv
[i
]));
235 chat_server_ptr
server(new chat_server(io_service
, endpoint
));
236 servers
.push_back(server
);
241 catch (std::exception
& e
)
243 std::cerr
<< "Exception: " << e
.what() << "\n";