File: main.cpp

package info (click to toggle)
cubemap 1.3.2-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 428 kB
  • sloc: cpp: 4,431; sh: 114; perl: 102; makefile: 60
file content (647 lines) | stat: -rw-r--r-- 19,471 bytes parent folder | download
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
#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <limits.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <systemd/sd-daemon.h>
#include <unistd.h>
#include <algorithm>
#include <map>
#include <set>
#include <string>
#include <utility>
#include <vector>

#include "acceptor.h"
#include "accesslog.h"
#include "config.h"
#include "input.h"
#include "input_stats.h"
#include "log.h"
#include "sa_compare.h"
#include "serverpool.h"
#include "state.pb.h"
#include "stats.h"
#include "stream.h"
#include "util.h"
#include "version.h"

using namespace std;

AccessLogThread *access_log = NULL;
ServerPool *servers = NULL;
volatile bool hupped = false;
volatile bool stopped = false;

typedef pair<string, Input::Encoding> InputKey;

namespace {

struct OrderByConnectionTime {
	bool operator() (const ClientProto &a, const ClientProto &b) const {
		if (a.connect_time_sec() != b.connect_time_sec())
			return a.connect_time_sec() < b.connect_time_sec();
		return a.connect_time_nsec() < b.connect_time_nsec();
	}
};

}  // namespace

struct InputWithRefcount {
	Input *input;
	int refcount;
};

void hup(int signum)
{
	hupped = true;
	if (signum == SIGINT) {
		stopped = true;
	}
}

void do_nothing(int signum)
{
}

CubemapStateProto collect_state(const timespec &serialize_start,
                                const vector<Acceptor *> acceptors,
                                const multimap<InputKey, InputWithRefcount> inputs,
                                ServerPool *servers)
{
	CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
	state.set_serialize_start_sec(serialize_start.tv_sec);
	state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
	
	for (size_t i = 0; i < acceptors.size(); ++i) {
		state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
	}

	for (multimap<InputKey, InputWithRefcount>::const_iterator input_it = inputs.begin();
	     input_it != inputs.end();
	     ++input_it) {
		state.add_inputs()->MergeFrom(input_it->second.input->serialize());
	}

	return state;
}

// Find all port statements in the configuration file, and create acceptors for htem.
vector<Acceptor *> create_acceptors(
	const Config &config,
	map<sockaddr_in6, Acceptor *, Sockaddr6Compare> *deserialized_acceptors)
{
	vector<Acceptor *> acceptors;
	for (unsigned i = 0; i < config.acceptors.size(); ++i) {
		const AcceptorConfig &acceptor_config = config.acceptors[i];
		Acceptor *acceptor = NULL;
		map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator deserialized_acceptor_it =
			deserialized_acceptors->find(acceptor_config.addr);
		if (deserialized_acceptor_it != deserialized_acceptors->end()) {
			acceptor = deserialized_acceptor_it->second;
			deserialized_acceptors->erase(deserialized_acceptor_it);
		} else {
			int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
			acceptor = new Acceptor(server_sock, acceptor_config.addr);
		}
		acceptor->run();
		acceptors.push_back(acceptor);
	}

	// Close all acceptors that are no longer in the configuration file.
	for (map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator
	         acceptor_it = deserialized_acceptors->begin();
	     acceptor_it != deserialized_acceptors->end();
	     ++acceptor_it) {
		acceptor_it->second->close_socket();
		delete acceptor_it->second;
	}

	return acceptors;
}

void create_config_input(const string &src, Input::Encoding encoding, multimap<InputKey, InputWithRefcount> *inputs)
{
	if (src.empty()) {
		return;
	}
	InputKey key(src, encoding);
	if (inputs->count(key) != 0) {
		return;
	}

	InputWithRefcount iwr;
	iwr.input = create_input(src, encoding);
	if (iwr.input == NULL) {
		log(ERROR, "did not understand URL '%s' or source encoding was invalid, clients will not get any data.",
			src.c_str());
		return;
	}
	iwr.refcount = 0;
	inputs->insert(make_pair(key, iwr));
}

// Find all streams in the configuration file, and create inputs for them.
void create_config_inputs(const Config &config, multimap<InputKey, InputWithRefcount> *inputs)
{
	for (unsigned i = 0; i < config.streams.size(); ++i) {
		const StreamConfig &stream_config = config.streams[i];
		if (stream_config.src != "delete") {
			create_config_input(stream_config.src, Input::Encoding(stream_config.src_encoding), inputs);
		}
	}
	for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
		const UDPStreamConfig &udpstream_config = config.udpstreams[i];
		create_config_input(udpstream_config.src, Input::INPUT_ENCODING_RAW, inputs);
	}
}

void create_streams(const Config &config,
                    const set<string> &deserialized_urls,
                    multimap<InputKey, InputWithRefcount> *inputs)
{
	// HTTP streams.
	set<string> expecting_urls = deserialized_urls;
	for (unsigned i = 0; i < config.streams.size(); ++i) {
		const StreamConfig &stream_config = config.streams[i];
		int stream_index;

		expecting_urls.erase(stream_config.url);

		// Special-case deleted streams; they were never deserialized in the first place,
		// so just ignore them.
		if (stream_config.src == "delete") {
			continue;
		}

		if (deserialized_urls.count(stream_config.url) == 0) {
			stream_index = servers->add_stream(stream_config.url,
			                                   stream_config.backlog_size,
			                                   stream_config.prebuffering_bytes,
			                                   Stream::Encoding(stream_config.encoding),
			                                   Stream::Encoding(stream_config.src_encoding));
		} else {
			stream_index = servers->lookup_stream_by_url(stream_config.url);
			assert(stream_index != -1);
			servers->set_backlog_size(stream_index, stream_config.backlog_size);
			servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
			servers->set_encoding(stream_index,
			                      Stream::Encoding(stream_config.encoding));
			servers->set_src_encoding(stream_index,
			                          Stream::Encoding(stream_config.src_encoding));
		}

		servers->set_pacing_rate(stream_index, stream_config.pacing_rate);

		string src = stream_config.src;
		Input::Encoding src_encoding = Input::Encoding(stream_config.src_encoding);
		if (!src.empty()) {
			multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, src_encoding));
			if (input_it != inputs->end()) {
				input_it->second.input->add_destination(stream_index);
				++input_it->second.refcount;
			}
		}
	}

	// Warn about any streams servers we've lost.
	for (set<string>::const_iterator stream_it = expecting_urls.begin();
	     stream_it != expecting_urls.end();
	     ++stream_it) {
		string url = *stream_it;
		log(WARNING, "stream '%s' disappeared from the configuration file. "
		             "It will not be deleted, but clients will not get any new inputs. "
		             "If you really meant to delete it, set src=delete and reload.",
		             url.c_str());
	}

	// UDP streams.
	for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
		const UDPStreamConfig &udpstream_config = config.udpstreams[i];
		int stream_index = servers->add_udpstream(
			udpstream_config.dst,
			udpstream_config.pacing_rate,
			udpstream_config.ttl,
			udpstream_config.multicast_iface_index);

		string src = udpstream_config.src;
		if (!src.empty()) {
			multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, Input::INPUT_ENCODING_RAW));
			assert(input_it != inputs->end());
			input_it->second.input->add_destination(stream_index);
			++input_it->second.refcount;
		}
	}

	// HTTP gen204 endpoints.
	for (unsigned i = 0; i < config.pings.size(); ++i) {
		const Gen204Config &ping_config = config.pings[i];
		servers->add_gen204(ping_config.url, ping_config.allow_origin);
	}
}
	
void open_logs(const vector<LogConfig> &log_destinations)
{
	for (size_t i = 0; i < log_destinations.size(); ++i) {
		if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
			add_log_destination_file(log_destinations[i].filename);
		} else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
			add_log_destination_console();
		} else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
			add_log_destination_syslog();
		} else {
			assert(false);
		}
	}
	start_logging();
}
	
bool dry_run_config(const string &argv0, const string &config_filename)
{
	char *argv0_copy = strdup(argv0.c_str());
	char *config_filename_copy = strdup(config_filename.c_str());

	pid_t pid = fork();
	switch (pid) {
	case -1:
		log_perror("fork()");
		free(argv0_copy);
		free(config_filename_copy);
		return false;
	case 0:
		// Child.
		execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
		log_perror(argv0_copy);
		_exit(1);
	default:
		// Parent.
		break;
	}
		
	free(argv0_copy);
	free(config_filename_copy);

	int status;
	pid_t err;
	do {
		err = waitpid(pid, &status, 0);
	} while (err == -1 && errno == EINTR);

	if (err == -1) {
		log_perror("waitpid()");
		return false;
	}	

	return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
}

void find_deleted_streams(const Config &config, set<string> *deleted_urls)
{
	for (unsigned i = 0; i < config.streams.size(); ++i) {
		const StreamConfig &stream_config = config.streams[i];
		if (stream_config.src == "delete") {
			log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
			deleted_urls->insert(stream_config.url);
		}
	}
}

int main(int argc, char **argv)
{
	signal(SIGHUP, hup);
	signal(SIGINT, hup);
	signal(SIGUSR1, do_nothing);  // Used in internal signalling.
	signal(SIGPIPE, SIG_IGN);
	
	// Parse options.
	int state_fd = -1;
	bool test_config = false;
	for ( ;; ) {
		static const option long_options[] = {
			{ "state", required_argument, 0, 's' },
			{ "test-config", no_argument, 0, 't' },
			{ 0, 0, 0, 0 }
		};
		int option_index = 0;
		int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
     
		if (c == -1) {
			break;
		}
		switch (c) {
		case 's':
			state_fd = atoi(optarg);
			break;
		case 't':
			test_config = true;
			break;
		default:
			fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
			exit(1);
		}
	}

	string config_filename = "cubemap.config";
	if (optind < argc) {
		config_filename = argv[optind++];
	}

	// Canonicalize argv[0] and config_filename.
	char argv0_canon[PATH_MAX];
	char config_filename_canon[PATH_MAX];

	if (realpath("/proc/self/exe", argv0_canon) == NULL) {
		log_perror(argv[0]);
		exit(1);
	}
	if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
		log_perror(config_filename.c_str());
		exit(1);
	}

	// Now parse the configuration file.
	Config config;
	if (!parse_config(config_filename_canon, &config)) {
		exit(1);
	}
	if (test_config) {
		exit(0);
	}
	
	// Ideally we'd like to daemonize only when we've started up all threads etc.,
	// but daemon() forks, which is not good in multithreaded software, so we'll
	// have to do it here.
	if (config.daemonize) {
		if (daemon(0, 0) == -1) {
			log_perror("daemon");
			exit(1);
		}
	}

start:
	// Open logs as soon as possible.
	open_logs(config.log_destinations);

	log(INFO, "Cubemap " SERVER_VERSION " starting.");
	if (config.access_log_file.empty()) {
		// Create a dummy logger.
		access_log = new AccessLogThread();
	} else {
		access_log = new AccessLogThread(config.access_log_file);
	}
	access_log->run();

	servers = new ServerPool(config.num_servers);

	// Find all the streams that are to be deleted.
	set<string> deleted_urls;
	find_deleted_streams(config, &deleted_urls);

	CubemapStateProto loaded_state;
	timespec serialize_start;
	set<string> deserialized_urls;
	map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
	multimap<InputKey, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
	if (state_fd != -1) {
		log(INFO, "Deserializing state from previous process...");
		string serialized;
		if (!read_tempfile_and_close(state_fd, &serialized)) {
			exit(1);
		}
		if (!loaded_state.ParseFromString(serialized)) {
			log(ERROR, "Failed deserialization of state.");
			exit(1);
		}

		serialize_start.tv_sec = loaded_state.serialize_start_sec();
		serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;

		// Deserialize the streams.
		map<string, string> stream_headers_for_url;  // See below.
		for (int i = 0; i < loaded_state.streams_size(); ++i) {
			const StreamProto &stream = loaded_state.streams(i);

			if (deleted_urls.count(stream.url()) != 0) {
				// Delete the stream backlogs.
				for (int j = 0; j < stream.data_fds_size(); ++j) {
					safe_close(stream.data_fds(j));
				}
			} else {
				vector<int> data_fds;
				for (int j = 0; j < stream.data_fds_size(); ++j) {
					data_fds.push_back(stream.data_fds(j));
				}

				servers->add_stream_from_serialized(stream, data_fds);
				deserialized_urls.insert(stream.url());

				stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
			}
		}

		// Deserialize the inputs. Note that we don't actually add them to any stream yet.
		for (int i = 0; i < loaded_state.inputs_size(); ++i) {
			InputProto serialized_input = loaded_state.inputs(i);

			InputWithRefcount iwr;
			iwr.input = create_input(serialized_input);
			iwr.refcount = 0;

			Input::Encoding src_encoding = serialized_input.is_metacube_encoded() ?
				Input::INPUT_ENCODING_METACUBE :
				Input::INPUT_ENCODING_RAW;
			InputKey key(serialized_input.url(), src_encoding);
			inputs.insert(make_pair(key, iwr));
		} 

		// Deserialize the acceptors.
		for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
			sockaddr_in6 sin6 = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
			deserialized_acceptors.insert(make_pair(
				sin6,
				new Acceptor(loaded_state.acceptors(i))));
		}

		log(INFO, "Deserialization done.");
	}

	// Add any new inputs coming from the config.
	create_config_inputs(config, &inputs);
	
	// Find all streams in the configuration file, create them, and connect to the inputs.
	create_streams(config, deserialized_urls, &inputs);
	vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);

	// Convert old-style timestamps to new-style timestamps for all clients;
	// this simplifies the sort below.
	{
		timespec now_monotonic;
		if (clock_gettime(CLOCK_MONOTONIC_COARSE, &now_monotonic) == -1) {
			log(ERROR, "clock_gettime(CLOCK_MONOTONIC_COARSE) failed.");
			exit(1);
		}
		long delta_sec = now_monotonic.tv_sec - time(NULL);

		for (int i = 0; i < loaded_state.clients_size(); ++i) {
			ClientProto* client = loaded_state.mutable_clients(i);
			if (client->has_connect_time_old()) {
				client->set_connect_time_sec(client->connect_time_old() + delta_sec);
				client->set_connect_time_nsec(now_monotonic.tv_nsec);
				client->clear_connect_time_old();
			}
		}
	}
	
	// Put back the existing clients. It doesn't matter which server we
	// allocate them to, so just do round-robin. However, we need to sort them
	// by connection time first, since add_client_serialized() expects that.
	sort(loaded_state.mutable_clients()->begin(),
	     loaded_state.mutable_clients()->end(),
	     OrderByConnectionTime());
	for (int i = 0; i < loaded_state.clients_size(); ++i) {
		if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
			safe_close(loaded_state.clients(i).sock());
		} else {
			servers->add_client_from_serialized(loaded_state.clients(i));
		}
	}
	
	servers->run();

	// Now delete all inputs that are longer in use, and start the others.
	for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
	     input_it != inputs.end(); ) {
		if (input_it->second.refcount == 0) {
			if (input_it->first.second == Input::INPUT_ENCODING_RAW) {
				log(WARNING, "Raw input '%s' no longer in use, closing.",
				    input_it->first.first.c_str());
			} else {
				assert(input_it->first.second == Input::INPUT_ENCODING_METACUBE);
				log(WARNING, "Metacube input '%s' no longer in use, closing.",
				    input_it->first.first.c_str());
			}
			input_it->second.input->close_socket();
			delete input_it->second.input;
			inputs.erase(input_it++);
		} else {
			input_it->second.input->run();
			++input_it;
		}
	}

	// Start writing statistics.
	StatsThread *stats_thread = NULL;
	if (!config.stats_file.empty()) {
		stats_thread = new StatsThread(config.stats_file, config.stats_interval);
		stats_thread->run();
	}

	InputStatsThread *input_stats_thread = NULL;
	if (!config.input_stats_file.empty()) {
		vector<Input*> inputs_no_refcount;
		for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
		     input_it != inputs.end(); ++input_it) {
			inputs_no_refcount.push_back(input_it->second.input);
		}

		input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
		input_stats_thread->run();
	}

	timespec server_start;
	int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
	assert(err != -1);
	if (state_fd != -1) {
		// Measure time from we started deserializing (below) to now, when basically everything
		// is up and running. This is, in other words, a conservative estimate of how long our
		// “glitch” period was, not counting of course reconnects if the configuration changed.
		double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
			1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
		log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
	}

	sd_notify(0, "READY=1");

	while (!hupped) {
		usleep(100000);
	}

	if (stopped) {
		sd_notify(0, "STOPPING=1");
	} else {
		sd_notify(0, "RELOADING=1");
	}

	// OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
	err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
	assert(err != -1);

	if (input_stats_thread != NULL) {
		input_stats_thread->stop();
		delete input_stats_thread;
	}
	if (stats_thread != NULL) {
		stats_thread->stop();
		delete stats_thread;
	}
	for (size_t i = 0; i < acceptors.size(); ++i) {
		acceptors[i]->stop();
	}
	for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
	     input_it != inputs.end();
	     ++input_it) {
		input_it->second.input->stop();
	}
	servers->stop();

	CubemapStateProto state;
	if (stopped) {
		log(INFO, "Shutting down.");
	} else {
		log(INFO, "Serializing state and re-execing...");
		state = collect_state(
			serialize_start, acceptors, inputs, servers);
		string serialized;
		state.SerializeToString(&serialized);
		state_fd = make_tempfile(serialized);
		if (state_fd == -1) {
			exit(1);
		}
	}
	delete servers;

	access_log->stop();
	delete access_log;
	shut_down_logging();

	if (stopped) {
		exit(0);
	}

	// OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
	if (!dry_run_config(argv0_canon, config_filename_canon)) {
		open_logs(config.log_destinations);
		log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
		hupped = false;
		shut_down_logging();
		goto start;
	}
	 
	char buf[16];
	sprintf(buf, "%d", state_fd);

	for ( ;; ) {
		execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
		open_logs(config.log_destinations);
		log_perror("execlp");
		log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
		shut_down_logging();
		usleep(200000);
	}
}