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7c673cae FG |
1 | // |
2 | // chat_server.cpp | |
3 | // ~~~~~~~~~~~~~~~ | |
4 | // | |
b32b8144 | 5 | // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
6 | // |
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) | |
9 | // | |
10 | ||
11 | #include <algorithm> | |
12 | #include <cstdlib> | |
13 | #include <deque> | |
14 | #include <iostream> | |
15 | #include <list> | |
16 | #include <set> | |
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" | |
22 | ||
23 | using boost::asio::ip::tcp; | |
24 | ||
25 | //---------------------------------------------------------------------- | |
26 | ||
27 | typedef std::deque<chat_message> chat_message_queue; | |
28 | ||
29 | //---------------------------------------------------------------------- | |
30 | ||
31 | class chat_participant | |
32 | { | |
33 | public: | |
34 | virtual ~chat_participant() {} | |
35 | virtual void deliver(const chat_message& msg) = 0; | |
36 | }; | |
37 | ||
38 | typedef boost::shared_ptr<chat_participant> chat_participant_ptr; | |
39 | ||
40 | //---------------------------------------------------------------------- | |
41 | ||
42 | class chat_room | |
43 | { | |
44 | public: | |
45 | void join(chat_participant_ptr participant) | |
46 | { | |
47 | participants_.insert(participant); | |
48 | std::for_each(recent_msgs_.begin(), recent_msgs_.end(), | |
49 | boost::bind(&chat_participant::deliver, participant, _1)); | |
50 | } | |
51 | ||
52 | void leave(chat_participant_ptr participant) | |
53 | { | |
54 | participants_.erase(participant); | |
55 | } | |
56 | ||
57 | void deliver(const chat_message& msg) | |
58 | { | |
59 | recent_msgs_.push_back(msg); | |
60 | while (recent_msgs_.size() > max_recent_msgs) | |
61 | recent_msgs_.pop_front(); | |
62 | ||
63 | std::for_each(participants_.begin(), participants_.end(), | |
64 | boost::bind(&chat_participant::deliver, _1, boost::ref(msg))); | |
65 | } | |
66 | ||
67 | private: | |
68 | std::set<chat_participant_ptr> participants_; | |
69 | enum { max_recent_msgs = 100 }; | |
70 | chat_message_queue recent_msgs_; | |
71 | }; | |
72 | ||
73 | //---------------------------------------------------------------------- | |
74 | ||
75 | class chat_session | |
76 | : public chat_participant, | |
77 | public boost::enable_shared_from_this<chat_session> | |
78 | { | |
79 | public: | |
b32b8144 FG |
80 | chat_session(boost::asio::io_context& io_context, chat_room& room) |
81 | : socket_(io_context), | |
7c673cae FG |
82 | room_(room) |
83 | { | |
84 | } | |
85 | ||
86 | tcp::socket& socket() | |
87 | { | |
88 | return socket_; | |
89 | } | |
90 | ||
91 | void start() | |
92 | { | |
93 | room_.join(shared_from_this()); | |
94 | boost::asio::async_read(socket_, | |
95 | boost::asio::buffer(read_msg_.data(), chat_message::header_length), | |
96 | boost::bind( | |
97 | &chat_session::handle_read_header, shared_from_this(), | |
98 | boost::asio::placeholders::error)); | |
99 | } | |
100 | ||
101 | void deliver(const chat_message& msg) | |
102 | { | |
103 | bool write_in_progress = !write_msgs_.empty(); | |
104 | write_msgs_.push_back(msg); | |
105 | if (!write_in_progress) | |
106 | { | |
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)); | |
112 | } | |
113 | } | |
114 | ||
115 | void handle_read_header(const boost::system::error_code& error) | |
116 | { | |
117 | if (!error && read_msg_.decode_header()) | |
118 | { | |
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)); | |
123 | } | |
124 | else | |
125 | { | |
126 | room_.leave(shared_from_this()); | |
127 | } | |
128 | } | |
129 | ||
130 | void handle_read_body(const boost::system::error_code& error) | |
131 | { | |
132 | if (!error) | |
133 | { | |
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)); | |
139 | } | |
140 | else | |
141 | { | |
142 | room_.leave(shared_from_this()); | |
143 | } | |
144 | } | |
145 | ||
146 | void handle_write(const boost::system::error_code& error) | |
147 | { | |
148 | if (!error) | |
149 | { | |
150 | write_msgs_.pop_front(); | |
151 | if (!write_msgs_.empty()) | |
152 | { | |
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)); | |
158 | } | |
159 | } | |
160 | else | |
161 | { | |
162 | room_.leave(shared_from_this()); | |
163 | } | |
164 | } | |
165 | ||
166 | private: | |
167 | tcp::socket socket_; | |
168 | chat_room& room_; | |
169 | chat_message read_msg_; | |
170 | chat_message_queue write_msgs_; | |
171 | }; | |
172 | ||
173 | typedef boost::shared_ptr<chat_session> chat_session_ptr; | |
174 | ||
175 | //---------------------------------------------------------------------- | |
176 | ||
177 | class chat_server | |
178 | { | |
179 | public: | |
b32b8144 | 180 | chat_server(boost::asio::io_context& io_context, |
7c673cae | 181 | const tcp::endpoint& endpoint) |
b32b8144 FG |
182 | : io_context_(io_context), |
183 | acceptor_(io_context, endpoint) | |
7c673cae FG |
184 | { |
185 | start_accept(); | |
186 | } | |
187 | ||
188 | void start_accept() | |
189 | { | |
b32b8144 | 190 | chat_session_ptr new_session(new chat_session(io_context_, room_)); |
7c673cae FG |
191 | acceptor_.async_accept(new_session->socket(), |
192 | boost::bind(&chat_server::handle_accept, this, new_session, | |
193 | boost::asio::placeholders::error)); | |
194 | } | |
195 | ||
196 | void handle_accept(chat_session_ptr session, | |
197 | const boost::system::error_code& error) | |
198 | { | |
199 | if (!error) | |
200 | { | |
201 | session->start(); | |
202 | } | |
203 | ||
204 | start_accept(); | |
205 | } | |
206 | ||
207 | private: | |
b32b8144 | 208 | boost::asio::io_context& io_context_; |
7c673cae FG |
209 | tcp::acceptor acceptor_; |
210 | chat_room room_; | |
211 | }; | |
212 | ||
213 | typedef boost::shared_ptr<chat_server> chat_server_ptr; | |
214 | typedef std::list<chat_server_ptr> chat_server_list; | |
215 | ||
216 | //---------------------------------------------------------------------- | |
217 | ||
218 | int main(int argc, char* argv[]) | |
219 | { | |
220 | try | |
221 | { | |
222 | if (argc < 2) | |
223 | { | |
224 | std::cerr << "Usage: chat_server <port> [<port> ...]\n"; | |
225 | return 1; | |
226 | } | |
227 | ||
b32b8144 | 228 | boost::asio::io_context io_context; |
7c673cae FG |
229 | |
230 | chat_server_list servers; | |
231 | for (int i = 1; i < argc; ++i) | |
232 | { | |
233 | using namespace std; // For atoi. | |
234 | tcp::endpoint endpoint(tcp::v4(), atoi(argv[i])); | |
b32b8144 | 235 | chat_server_ptr server(new chat_server(io_context, endpoint)); |
7c673cae FG |
236 | servers.push_back(server); |
237 | } | |
238 | ||
b32b8144 | 239 | io_context.run(); |
7c673cae FG |
240 | } |
241 | catch (std::exception& e) | |
242 | { | |
243 | std::cerr << "Exception: " << e.what() << "\n"; | |
244 | } | |
245 | ||
246 | return 0; | |
247 | } |