summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/util/server_ws_impl.hpp
blob: cbb6f9b4908c4242831763fef249e6e17fdf1a05 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
// license:MIT
// copyright-holders:Ole Christian Eidheim, Miodrag Milanovic
#ifndef MAME_LIB_UTIL_SERVER_WS_IMPL_HPP
#define MAME_LIB_UTIL_SERVER_WS_IMPL_HPP
#include "path_to_regex.hpp"
#include "crypto.hpp"

#include "asio.h"
#include "asio/system_timer.hpp"

#include "server_ws.hpp"
#include <unordered_map>
#include <thread>
#include <mutex>
#include <unordered_set>
#include <list>
#include <memory>
#include <atomic>
#include <iostream>
#include <map>
#include <chrono>
#include <regex>

#ifndef CASE_INSENSITIVE_EQUALS_AND_HASH
#define CASE_INSENSITIVE_EQUALS_AND_HASH
class case_insensitive_equals {
public:
	bool operator()(const std::string &key1, const std::string &key2) const {
		return key1.size() == key2.size()
			&& equal(key1.cbegin(), key1.cend(), key2.cbegin(),
				[](std::string::value_type key1v, std::string::value_type key2v)
		{ return tolower(key1v) == tolower(key2v); });
	}
};
class case_insensitive_hash {
public:
	size_t operator()(const std::string &key) const {
		size_t seed = 0;
		for (auto &c : key) {
			std::hash<char> hasher;
			seed ^= hasher(std::tolower(c)) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
		}
		return seed;
	}
};
#endif

namespace webpp {
	template <class socket_type>
	class SocketServer;

	template <class socket_type>
	class SocketServerBase {
	public:
		virtual ~SocketServerBase() {}

		class SendStream : public std::ostream, public std::enable_shared_from_this<SendStream> {
			friend class SocketServerBase<socket_type>;

			asio::streambuf streambuf;
		public:
			SendStream(): std::ostream(&streambuf) {}
			size_t size() const {
				return streambuf.size();
			}
		};


		class Connection : public webpp::Connection {
			friend class SocketServerBase<socket_type>;
			friend class SocketServer<socket_type>;
			using super = webpp::Connection;

		public:
			virtual ~Connection() {}
			explicit Connection(const std::shared_ptr<socket_type> &socket) : super(0), socket(socket), strand(socket->get_io_service()), closed(false) { }

		private:
			explicit Connection(socket_type *socket): super(0), socket(socket), strand(socket->get_io_service()), closed(false) { }

			class SendData {
			public:
				SendData(const std::shared_ptr<SendStream> &header_stream, const std::shared_ptr<SendStream> &message_stream,
						const std::function<void(const std::error_code)> &callback) :
						header_stream(header_stream), message_stream(message_stream), callback(callback) {}
				std::shared_ptr<SendStream> header_stream;
				std::shared_ptr<SendStream> message_stream;
				std::function<void(const std::error_code)> callback;
			};

			std::shared_ptr<socket_type> socket;

			asio::io_context::strand strand;

			std::list<SendData> send_queue;

			void send_from_queue(const std::shared_ptr<Connection> &connection) {
				strand.post([this, connection]() {
					asio::async_write(*socket, send_queue.begin()->header_stream->streambuf,
							strand.wrap([this, connection](const std::error_code& ec, size_t /*bytes_transferred*/) {
						if(!ec) {
							asio::async_write(*socket, send_queue.begin()->message_stream->streambuf,
									strand.wrap([this, connection]
									(const std::error_code& ec, size_t /*bytes_transferred*/) {
								auto send_queued=send_queue.begin();
								if(send_queued->callback)
									send_queued->callback(ec);
								if(!ec) {
									send_queue.erase(send_queued);
									if(send_queue.size()>0)
										send_from_queue(connection);
								}
								else
									send_queue.clear();
							}));
						}
						else {
							auto send_queued=send_queue.begin();
							if(send_queued->callback)
								send_queued->callback(ec);
							send_queue.clear();
						}
					}));
				});
			}

			std::atomic<bool> closed;

			std::unique_ptr<asio::system_timer> timer_idle;

			void read_remote_endpoint_data() {
				try {
					remote_endpoint_address=socket->lowest_layer().remote_endpoint().address().to_string();
					remote_endpoint_port=socket->lowest_layer().remote_endpoint().port();
				}
				catch (...) {}
			}
		};

		class Message : public std::istream, public std::enable_shared_from_this<Message> {
			friend class SocketServerBase<socket_type>;

		public:
			unsigned char fin_rsv_opcode;
			size_t size() const {
				return length;
			}
			std::string string() const {
				std::stringstream ss;
				ss << rdbuf();
				return ss.str();
			}
		private:
			Message(): std::istream(&streambuf), fin_rsv_opcode(0), length(0) {}

			size_t length;
			asio::streambuf streambuf;
		};

		class Endpoint : public std::enable_shared_from_this<Endpoint> {
			friend class SocketServerBase<socket_type>;
			std::unordered_set<std::shared_ptr<Connection> > connections;
			std::mutex connections_mutex;

		public:
			std::function<void(std::shared_ptr<Connection>)> on_open;
			std::function<void(std::shared_ptr<Connection>, std::shared_ptr<Message>)> on_message;
			std::function<void(std::shared_ptr<Connection>, int, const std::string&)> on_close;
			std::function<void(std::shared_ptr<Connection>, const std::error_code&)> on_error;

			std::unordered_set<std::shared_ptr<Connection> > get_connections() {
				std::lock_guard<std::mutex> lock(connections_mutex);
				auto copy=connections;
				return copy;
			}
		};

		class Config {
			friend class SocketServerBase<socket_type>;

			Config(unsigned short port) : port(port) {}
		public:
			/// Port number to use. Defaults to 80 for HTTP and 443 for HTTPS.
			unsigned short port;
			/// Number of threads that the server will use when start() is called. Defaults to 1 thread.
			size_t thread_pool_size=1;
			/// Timeout on request handling. Defaults to 5 seconds.
			size_t timeout_request=5;
			/// Idle timeout. Defaults to no timeout.
			size_t timeout_idle=0;
			/// IPv4 address in dotted decimal form or IPv6 address in hexadecimal notation.
			/// If empty, the address will be any address.
			std::string address;
			/// Set to false to avoid binding the socket to an address that is already in use. Defaults to true.
			bool reuse_address=true;
		};
		///Set before calling start().
		Config config;

	private:
		class regex_orderable : public std::regex {
			std::string str;
			path2regex::Keys keys;
		public:
			regex_orderable(const char *regex_cstr) : std::regex(path2regex::path_to_regex(regex_cstr, keys)), str(regex_cstr) {}
			regex_orderable(const std::string &regex_cstr) : std::regex(path2regex::path_to_regex(regex_cstr, keys)), str(regex_cstr) {}
			bool operator<(const regex_orderable  &rhs) const {
				return str<rhs.str;
			}
		};
	public:
		/// Warning: do not access (red or write) m_endpoint without holding m_endpoint_mutex
		std::map<regex_orderable, Endpoint> m_endpoint;
		std::mutex m_endpoint_mutex;

		virtual void start() {
			if(!io_context)
				io_context=std::make_shared<asio::io_context>();

			if(io_context->stopped())
				io_context->reset();

			asio::ip::tcp::endpoint endpoint;
			if(config.address.size()>0)
				endpoint=asio::ip::tcp::endpoint(asio::ip::address::from_string(config.address), config.port);
			else
				endpoint=asio::ip::tcp::endpoint(asio::ip::tcp::v4(), config.port);

			if(!acceptor)
				acceptor= std::make_unique<asio::ip::tcp::acceptor>(*io_context);
			acceptor->open(endpoint.protocol());
			acceptor->set_option(asio::socket_base::reuse_address(config.reuse_address));
			acceptor->bind(endpoint);
			acceptor->listen();

			accept();

			io_context->run();
		}

		void stop() {
			acceptor->close();
			io_context->stop();

			std::lock_guard<std::mutex> lock(m_endpoint_mutex);
			for(auto& p: m_endpoint)
				p.second.connections.clear();
		}

		///fin_rsv_opcode: 129=one fragment, text, 130=one fragment, binary, 136=close connection.
		///See http://tools.ietf.org/html/rfc6455#section-5.2 for more information
		void send(std::shared_ptr<webpp::Connection> conn, const std::shared_ptr<SendStream> &message_stream,
				const std::function<void(const std::error_code&)>& callback=nullptr,
				unsigned char fin_rsv_opcode=129) const {
			std::shared_ptr<Connection> connection = std::dynamic_pointer_cast<Connection> (conn);
			if (!connection) return;

			if(fin_rsv_opcode!=136)
				timer_idle_reset(connection);

			auto header_stream = std::make_shared<SendStream>();

			size_t length=message_stream->size();

			header_stream->put(fin_rsv_opcode);
			//unmasked (first length byte<128)
			if(length>=126) {
				int num_bytes;
				if(length>0xffff) {
					num_bytes=8;
					header_stream->put(127);
				}
				else {
					num_bytes=2;
					header_stream->put(126);
				}

				for(int c=num_bytes-1;c>=0;c--) {
					header_stream->put((static_cast<unsigned long long>(length) >> (8 * c)) % 256);
				}
			}
			else
				header_stream->put(static_cast<unsigned char>(length));

			connection->strand.post([connection, header_stream, message_stream, callback]() {
				connection->send_queue.emplace_back(header_stream, message_stream, callback);
				if(connection->send_queue.size()==1)
					connection->send_from_queue(connection);
			});
		}

		void send_close(std::shared_ptr<webpp::Connection> conn, int status, const std::string& reason="",
				const std::function<void(const std::error_code&)>& callback=nullptr) const {
			std::shared_ptr<Connection> connection = std::dynamic_pointer_cast<Connection> (conn);
			if (!connection) return;
			//Send close only once (in case close is initiated by server)
			if(connection->closed)
				return;
			connection->closed=true;

			auto send_stream=std::make_shared<SendStream>();

			send_stream->put(status>>8);
			send_stream->put(status%256);

			*send_stream << reason;

			//fin_rsv_opcode=136: message close
			send(connection, send_stream, callback, 136);
		}

		std::unordered_set<std::shared_ptr<Connection> > get_connections() {
			std::unordered_set<std::shared_ptr<Connection> > all_connections;
			std::lock_guard<std::mutex> lock(m_endpoint_mutex);
			for(auto& e: m_endpoint) {
				std::lock_guard<std::mutex> lock(e.second.connections_mutex);
				all_connections.insert(e.second.connections.begin(), e.second.connections.end());
			}
			return all_connections;
		}

		/**
		* Upgrades a request, from for instance Simple-Web-Server, to a WebSocket connection.
		* The parameters are moved to the Connection object.
		* See also Server::on_upgrade in the Simple-Web-Server project.
		* The socket's io_service is used, thus running start() is not needed.
		*
		* Example use:
		* server.on_upgrade=[&socket_server] (auto socket, auto request) {
		*   auto connection=std::make_shared<SimpleWeb::SocketServer<SimpleWeb::WS>::Connection>(socket);
		*   connection->method=std::move(request->method);
		*   connection->path=std::move(request->path);
		*   connection->http_version=std::move(request->http_version);
		*   connection->header=std::move(request->header);
		*   connection->remote_endpoint_address=std::move(request->remote_endpoint_address);
		*   connection->remote_endpoint_port=request->remote_endpoint_port;
		*   socket_server.upgrade(connection);
		* }
		*/
		void upgrade(const std::shared_ptr<Connection> &connection) {
			auto read_buffer=std::make_shared<asio::streambuf>();
			write_handshake(connection, read_buffer);
		}

		/// If you have your own asio::io_context, store its pointer here before running start().
		/// You might also want to set config.num_threads to 0.
		std::shared_ptr<asio::io_context> io_context;
	protected:
		const std::string ws_magic_string="258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

		std::unique_ptr<asio::ip::tcp::acceptor> acceptor;

		std::vector<std::thread> threads;

		SocketServerBase(unsigned short port) :
				config(port) {}

		virtual void accept()=0;

		std::shared_ptr<asio::system_timer> get_timeout_timer(const std::shared_ptr<Connection> &connection, size_t seconds) {
			if (seconds == 0)
				return nullptr;
			auto timer = std::make_shared<asio::system_timer>(connection->socket->get_io_service());
			timer->expires_at(std::chrono::system_clock::now() + std::chrono::seconds(static_cast<long>(seconds)));
			timer->async_wait([connection](const std::error_code& ec){
				if(!ec) {
					connection->socket->lowest_layer().shutdown(asio::ip::tcp::socket::shutdown_both);
					connection->socket->lowest_layer().close();
				}
			});
			return timer;
		}

		void read_handshake(const std::shared_ptr<Connection> &connection) {
			connection->read_remote_endpoint_data();

			//Create new read_buffer for async_read_until()
			//Shared_ptr is used to pass temporary objects to the asynchronous functions
			auto read_buffer = std::make_shared<asio::streambuf>();

			//Set timeout on the following asio::async-read or write function
			auto timer = get_timeout_timer(connection, config.timeout_request);

			asio::async_read_until(*connection->socket, *read_buffer, "\r\n\r\n",
					[this, connection, read_buffer, timer]
					(const std::error_code& ec, size_t /*bytes_transferred*/) {
				if(timer)
					timer->cancel();
				if(!ec) {
					//Convert to istream to extract string-lines
					std::istream stream(read_buffer.get());

					parse_handshake(connection, stream);

					write_handshake(connection, read_buffer);
				}
			});
		}

		void parse_handshake(const std::shared_ptr<Connection> &connection, std::istream& stream) const {
			std::string line;
			getline(stream, line);
			size_t method_end;
			if((method_end=line.find(' '))!=std::string::npos) {
				size_t path_end;
				if((path_end=line.find(' ', method_end+1))!=std::string::npos) {
					connection->method=line.substr(0, method_end);
					connection->path=line.substr(method_end+1, path_end-method_end-1);
					if((path_end+6)<line.size())
						connection->http_version=line.substr(path_end+6, line.size()-(path_end+6)-1);
					else
						connection->http_version="1.1";

					getline(stream, line);
					size_t param_end;
					while((param_end=line.find(':'))!=std::string::npos) {
						size_t value_start=param_end+1;
						if((value_start)<line.size()) {
							if(line[value_start]==' ')
								value_start++;
							if(value_start<line.size())
								connection->header.emplace(line.substr(0, param_end), line.substr(value_start, line.size()-value_start-1));
						}

						getline(stream, line);
					}
				}
			}
		}

		void write_handshake(const std::shared_ptr<Connection> &connection, const std::shared_ptr<asio::streambuf> &read_buffer) {
			//Find path- and method-match, and generate response
			std::lock_guard<std::mutex> lock(m_endpoint_mutex);
			for (auto &regex_endpoint : m_endpoint) {
				std::smatch path_match;
				if(std::regex_match(connection->path, path_match, regex_endpoint.first)) {
					auto write_buffer = std::make_shared<asio::streambuf>();
					std::ostream handshake(write_buffer.get());

					if(generate_handshake(connection, handshake)) {
						connection->path_match=std::move(path_match);
						//Capture write_buffer in lambda so it is not destroyed before async_write is finished
						asio::async_write(*connection->socket, *write_buffer,
								[this, connection, write_buffer, read_buffer, &regex_endpoint]
								(const std::error_code& ec, size_t /*bytes_transferred*/) {
							if(!ec) {
								connection_open(connection, regex_endpoint.second);
								read_message(connection, read_buffer, regex_endpoint.second);
							}
							else
								connection_error(connection, regex_endpoint.second, ec);
						});
					}
					return;
				}
			}
		}

		bool generate_handshake(const std::shared_ptr<Connection> &connection, std::ostream& handshake) const {
			auto header_it = connection->header.find("Sec-WebSocket-Key");
			if (header_it == connection->header.end())
				return false;

			auto sha1=sha1_encode(header_it->second + ws_magic_string);

			handshake << "HTTP/1.1 101 Web Socket Protocol Handshake\r\n";
			handshake << "Upgrade: websocket\r\n";
			handshake << "Connection: Upgrade\r\n";
			handshake << "Sec-WebSocket-Accept: " << base64_encode(sha1) << "\r\n";
			handshake << "\r\n";

			return true;
		}

		void read_message(const std::shared_ptr<Connection> &connection,
						  const std::shared_ptr<asio::streambuf> &read_buffer, Endpoint& endpoint) const {
			asio::async_read(*connection->socket, *read_buffer, asio::transfer_exactly(2),
					[this, connection, read_buffer, &endpoint]
					(const std::error_code& ec, size_t bytes_transferred) {
				if(!ec) {
					if(bytes_transferred==0) { //TODO: why does this happen sometimes?
						read_message(connection, read_buffer, endpoint);
						return;
					}
					std::istream stream(read_buffer.get());

					std::vector<unsigned char> first_bytes;
					first_bytes.resize(2);
					stream.read(reinterpret_cast<char*>(&first_bytes[0]), 2);

					unsigned char fin_rsv_opcode=first_bytes[0];

					//Close connection if unmasked message from client (protocol error)
					if(first_bytes[1]<128) {
						const std::string reason("message from client not masked");
						send_close(connection, 1002, reason, [connection](const std::error_code& /*ec*/) {});
						connection_close(connection, endpoint, 1002, reason);
						return;
					}

					size_t length=(first_bytes[1]&127);

					if(length==126) {
						//2 next bytes is the size of content
						asio::async_read(*connection->socket, *read_buffer, asio::transfer_exactly(2),
								[this, connection, read_buffer, &endpoint, fin_rsv_opcode]
								(const std::error_code& ec, size_t /*bytes_transferred*/) {
							if(!ec) {
								std::istream stream(read_buffer.get());

								std::vector<unsigned char> length_bytes;
								length_bytes.resize(2);
								stream.read(reinterpret_cast<char*>(&length_bytes[0]), 2);

								size_t length=0;
								int num_bytes=2;
								for(int c=0;c<num_bytes;c++)
									length+=length_bytes[c]<<(8*(num_bytes-1-c));

								read_message_content(connection, read_buffer, length, endpoint, fin_rsv_opcode);
							}
							else
								connection_error(connection, endpoint, ec);
						});
					}
					else if(length==127) {
						//8 next bytes is the size of content
						asio::async_read(*connection->socket, *read_buffer, asio::transfer_exactly(8),
								[this, connection, read_buffer, &endpoint, fin_rsv_opcode]
								(const std::error_code& ec, size_t /*bytes_transferred*/) {
							if(!ec) {
								std::istream stream(read_buffer.get());

								std::vector<unsigned char> length_bytes;
								length_bytes.resize(8);
								stream.read(reinterpret_cast<char*>(&length_bytes[0]), 8);

								size_t length=0;
								int num_bytes=8;
								for(int c=0;c<num_bytes;c++)
									length+=length_bytes[c]<<(8*(num_bytes-1-c));

								read_message_content(connection, read_buffer, length, endpoint, fin_rsv_opcode);
							}
							else
								connection_error(connection, endpoint, ec);
						});
					}
					else
						read_message_content(connection, read_buffer, length, endpoint, fin_rsv_opcode);
				}
				else
					connection_error(connection, endpoint, ec);
			});
		}

		void read_message_content(const std::shared_ptr<Connection> &connection, const std::shared_ptr<asio::streambuf> &read_buffer,
								  size_t length, Endpoint& endpoint, unsigned char fin_rsv_opcode) const {
			asio::async_read(*connection->socket, *read_buffer, asio::transfer_exactly(4+length),
					[this, connection, read_buffer, length, &endpoint, fin_rsv_opcode]
					(const std::error_code& ec, size_t /*bytes_transferred*/) {
				if(!ec) {
					std::istream raw_message_data(read_buffer.get());

					//Read mask
					std::vector<unsigned char> mask;
					mask.resize(4);
					raw_message_data.read(reinterpret_cast<char*>(&mask[0]), 4);

					std::shared_ptr<Message> message(new Message());
					message->length=length;
					message->fin_rsv_opcode=fin_rsv_opcode;

					std::ostream message_data_out_stream(&message->streambuf);
					for(size_t c=0;c<length;c++) {
						message_data_out_stream.put(raw_message_data.get()^mask[c%4]);
					}

					//If connection close
					if((fin_rsv_opcode&0x0f)==8) {
						int status=0;
						if(length>=2) {
							unsigned char byte1=message->get();
							unsigned char byte2=message->get();
							status=(byte1<<8)+byte2;
						}

						auto reason=message->string();
						send_close(connection, status, reason, [connection](const std::error_code& /*ec*/) {});
						connection_close(connection, endpoint, status, reason);
						return;
					}
					else {
						//If ping
						if((fin_rsv_opcode&0x0f)==9) {
							//send pong
							auto empty_send_stream=std::make_shared<SendStream>();
							send(connection, empty_send_stream, nullptr, fin_rsv_opcode+1);
						}
						else if(endpoint.on_message) {
							timer_idle_reset(connection);
							endpoint.on_message(connection, message);
						}

						//Next message
						read_message(connection, read_buffer, endpoint);
					}
				}
				else
					connection_error(connection, endpoint, ec);
			});
		}

		void connection_open(const std::shared_ptr<Connection> &connection, Endpoint& endpoint) {
			timer_idle_init(connection);

			{
				std::lock_guard<std::mutex> lock(endpoint.connections_mutex);
				endpoint.connections.insert(connection);
			}

			if(endpoint.on_open)
				endpoint.on_open(connection);
		}

		void connection_close(const std::shared_ptr<Connection> &connection, Endpoint& endpoint, int status, const std::string& reason) const {
			timer_idle_cancel(connection);

			{
				std::lock_guard<std::mutex> lock(endpoint.connections_mutex);
				endpoint.connections.erase(connection);
			}

			if(endpoint.on_close)
				endpoint.on_close(connection, status, reason);
		}

		void connection_error(const std::shared_ptr<Connection> &connection, Endpoint& endpoint, const std::error_code& ec) const {
			timer_idle_cancel(connection);

			{
				std::lock_guard<std::mutex> lock(endpoint.connections_mutex);
				endpoint.connections.erase(connection);
			}

			if(endpoint.on_error) {
				std::error_code ec_tmp=ec;
				endpoint.on_error(connection, ec_tmp);
			}
		}

		void timer_idle_init(const std::shared_ptr<Connection> &connection) {
			if(config.timeout_idle>0) {
				connection->timer_idle= std::make_unique<asio::system_timer>(connection->socket->get_io_service());
				connection->timer_idle->expires_from_now(std::chrono::seconds(static_cast<unsigned long>(config.timeout_idle)));
				timer_idle_expired_function(connection);
			}
		}
		void timer_idle_reset(const std::shared_ptr<Connection> &connection) const {
			if(config.timeout_idle>0 && connection->timer_idle->expires_from_now(std::chrono::seconds(static_cast<unsigned long>(config.timeout_idle)))>0)
				timer_idle_expired_function(connection);
		}
		void timer_idle_cancel(const std::shared_ptr<Connection> &connection) const {
			if(config.timeout_idle>0)
				connection->timer_idle->cancel();
		}

		void timer_idle_expired_function(const std::shared_ptr<Connection> &connection) const {
			connection->timer_idle->async_wait([this, connection](const std::error_code& ec){
				if(!ec)
					send_close(connection, 1000, "idle timeout"); //1000=normal closure
			});
		}
	};

	template<class socket_type>
	class SocketServer : public SocketServerBase<socket_type> {
	public:
		SocketServer(unsigned short port, size_t timeout_request, size_t timeout_idle)
			: SocketServerBase<socket_type>(port, timeout_request, timeout_idle)
		{
		}
	};

	using WS = asio::ip::tcp::socket;

	template<>
	class SocketServer<WS> : public SocketServerBase<WS> {
	public:
		SocketServer() : SocketServerBase<WS>(80) {}
	protected:
		void accept() override {
			//Create new socket for this connection (stored in Connection::socket)
			//Shared_ptr is used to pass temporary objects to the asynchronous functions
			std::shared_ptr<Connection> connection(new Connection(new WS(*io_context)));

			acceptor->async_accept(*connection->socket, [this, connection](const std::error_code& ec) {
				//Immediately start accepting a new connection (if io_context hasn't been stopped)
				if (ec != asio::error::operation_aborted)
					accept();

				if(!ec) {
					asio::ip::tcp::no_delay option(true);
					connection->socket->set_option(option);

					read_handshake(connection);
				}
			});
		}
	};

	class ws_server : public SocketServer<WS> {
	public:
		ws_server() : SocketServer<WS>::SocketServer() {}
	};
}
#endif  /* MAME_LIB_UTIL_SERVER_WS_IMPL_HPP */