20 #include "accesslog.h"
23 #include "input_stats.h"
26 #include "serverpool.h"
35 AccessLogThread *access_log = NULL;
36 ServerPool *servers = NULL;
37 vector<MarkPool *> mark_pools;
38 volatile bool hupped = false;
39 volatile bool stopped = false;
41 struct InputWithRefcount {
49 if (signum == SIGINT) {
54 void do_nothing(int signum)
58 CubemapStateProto collect_state(const timeval &serialize_start,
59 const vector<Acceptor *> acceptors,
60 const multimap<string, InputWithRefcount> inputs,
63 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
64 state.set_serialize_start_sec(serialize_start.tv_sec);
65 state.set_serialize_start_usec(serialize_start.tv_usec);
67 for (size_t i = 0; i < acceptors.size(); ++i) {
68 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
71 for (multimap<string, InputWithRefcount>::const_iterator input_it = inputs.begin();
72 input_it != inputs.end();
74 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
80 // Find all port statements in the configuration file, and create acceptors for htem.
81 vector<Acceptor *> create_acceptors(
83 map<int, Acceptor *> *deserialized_acceptors)
85 vector<Acceptor *> acceptors;
86 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
87 const AcceptorConfig &acceptor_config = config.acceptors[i];
88 Acceptor *acceptor = NULL;
89 map<int, Acceptor *>::iterator deserialized_acceptor_it =
90 deserialized_acceptors->find(acceptor_config.port);
91 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
92 acceptor = deserialized_acceptor_it->second;
93 deserialized_acceptors->erase(deserialized_acceptor_it);
95 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
96 acceptor = new Acceptor(server_sock, acceptor_config.port);
99 acceptors.push_back(acceptor);
102 // Close all acceptors that are no longer in the configuration file.
103 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
104 acceptor_it != deserialized_acceptors->end();
106 acceptor_it->second->close_socket();
107 delete acceptor_it->second;
113 void create_config_input(const string &src, multimap<string, InputWithRefcount> *inputs)
118 if (inputs->count(src) != 0) {
122 InputWithRefcount iwr;
123 iwr.input = create_input(src);
124 if (iwr.input == NULL) {
125 log(ERROR, "did not understand URL '%s', clients will not get any data.",
130 inputs->insert(make_pair(src, iwr));
133 // Find all streams in the configuration file, and create inputs for them.
134 void create_config_inputs(const Config &config, multimap<string, InputWithRefcount> *inputs)
136 for (unsigned i = 0; i < config.streams.size(); ++i) {
137 const StreamConfig &stream_config = config.streams[i];
138 if (stream_config.src != "delete") {
139 create_config_input(stream_config.src, inputs);
142 for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
143 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
144 create_config_input(udpstream_config.src, inputs);
148 void create_streams(const Config &config,
149 const set<string> &deserialized_urls,
150 multimap<string, InputWithRefcount> *inputs)
152 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
153 const MarkPoolConfig &mp_config = config.mark_pools[i];
154 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
158 set<string> expecting_urls = deserialized_urls;
159 for (unsigned i = 0; i < config.streams.size(); ++i) {
160 const StreamConfig &stream_config = config.streams[i];
163 expecting_urls.erase(stream_config.url);
165 // Special-case deleted streams; they were never deserialized in the first place,
166 // so just ignore them.
167 if (stream_config.src == "delete") {
171 if (deserialized_urls.count(stream_config.url) == 0) {
172 stream_index = servers->add_stream(stream_config.url,
173 stream_config.backlog_size,
174 Stream::Encoding(stream_config.encoding));
176 stream_index = servers->lookup_stream_by_url(stream_config.url);
177 assert(stream_index != -1);
178 servers->set_backlog_size(stream_index, stream_config.backlog_size);
179 servers->set_encoding(stream_index,
180 Stream::Encoding(stream_config.encoding));
183 if (stream_config.mark_pool != -1) {
184 servers->set_mark_pool(stream_index, mark_pools[stream_config.mark_pool]);
187 string src = stream_config.src;
189 multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
190 if (input_it != inputs->end()) {
191 input_it->second.input->add_destination(stream_index);
192 ++input_it->second.refcount;
197 // Warn about any streams servers we've lost.
198 for (set<string>::const_iterator stream_it = expecting_urls.begin();
199 stream_it != expecting_urls.end();
201 string url = *stream_it;
202 log(WARNING, "stream '%s' disappeared from the configuration file. "
203 "It will not be deleted, but clients will not get any new inputs. "
204 "If you really meant to delete it, set src=delete and reload.",
209 for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
210 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
211 MarkPool *mark_pool = NULL;
212 if (udpstream_config.mark_pool != -1) {
213 mark_pool = mark_pools[udpstream_config.mark_pool];
215 int stream_index = servers->add_udpstream(udpstream_config.dst, mark_pool);
217 string src = udpstream_config.src;
219 multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
220 assert(input_it != inputs->end());
221 input_it->second.input->add_destination(stream_index);
222 ++input_it->second.refcount;
227 void open_logs(const vector<LogConfig> &log_destinations)
229 for (size_t i = 0; i < log_destinations.size(); ++i) {
230 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
231 add_log_destination_file(log_destinations[i].filename);
232 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
233 add_log_destination_console();
234 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
235 add_log_destination_syslog();
243 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
245 char *argv0_copy = strdup(argv0.c_str());
246 char *config_filename_copy = strdup(config_filename.c_str());
251 log_perror("fork()");
253 free(config_filename_copy);
257 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
258 log_perror(argv0_copy);
266 free(config_filename_copy);
271 err = waitpid(pid, &status, 0);
272 } while (err == -1 && errno == EINTR);
275 log_perror("waitpid()");
279 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
282 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
284 for (unsigned i = 0; i < config.streams.size(); ++i) {
285 const StreamConfig &stream_config = config.streams[i];
286 if (stream_config.src == "delete") {
287 log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
288 deleted_urls->insert(stream_config.url);
293 int main(int argc, char **argv)
297 signal(SIGUSR1, do_nothing); // Used in internal signalling.
298 signal(SIGPIPE, SIG_IGN);
302 bool test_config = false;
304 static const option long_options[] = {
305 { "state", required_argument, 0, 's' },
306 { "test-config", no_argument, 0, 't' },
309 int option_index = 0;
310 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
317 state_fd = atoi(optarg);
323 fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
328 string config_filename = "cubemap.config";
330 config_filename = argv[optind++];
333 // Canonicalize argv[0] and config_filename.
334 char argv0_canon[PATH_MAX];
335 char config_filename_canon[PATH_MAX];
337 if (realpath(argv[0], argv0_canon) == NULL) {
341 if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
342 log_perror(config_filename.c_str());
346 // Now parse the configuration file.
348 if (!parse_config(config_filename_canon, &config)) {
355 // Ideally we'd like to daemonize only when we've started up all threads etc.,
356 // but daemon() forks, which is not good in multithreaded software, so we'll
357 // have to do it here.
358 if (config.daemonize) {
359 if (daemon(0, 0) == -1) {
360 log_perror("daemon");
366 // Open logs as soon as possible.
367 open_logs(config.log_destinations);
369 log(INFO, "Cubemap " SERVER_VERSION " starting.");
370 if (config.access_log_file.empty()) {
371 // Create a dummy logger.
372 access_log = new AccessLogThread();
374 access_log = new AccessLogThread(config.access_log_file);
378 servers = new ServerPool(config.num_servers);
380 // Find all the streams that are to be deleted.
381 set<string> deleted_urls;
382 find_deleted_streams(config, &deleted_urls);
384 CubemapStateProto loaded_state;
385 struct timeval serialize_start;
386 set<string> deserialized_urls;
387 map<int, Acceptor *> deserialized_acceptors;
388 multimap<string, InputWithRefcount> inputs; // multimap due to older versions without deduplication.
389 if (state_fd != -1) {
390 log(INFO, "Deserializing state from previous process...");
392 if (!read_tempfile(state_fd, &serialized)) {
395 if (!loaded_state.ParseFromString(serialized)) {
396 log(ERROR, "Failed deserialization of state.");
400 serialize_start.tv_sec = loaded_state.serialize_start_sec();
401 serialize_start.tv_usec = loaded_state.serialize_start_usec();
403 // Deserialize the streams.
404 for (int i = 0; i < loaded_state.streams_size(); ++i) {
405 const StreamProto &stream = loaded_state.streams(i);
407 if (deleted_urls.count(stream.url()) != 0) {
408 // Delete the stream backlogs.
409 for (int j = 0; j < stream.data_fds_size(); ++j) {
410 safe_close(stream.data_fds(j));
413 vector<int> data_fds;
414 for (int j = 0; j < stream.data_fds_size(); ++j) {
415 data_fds.push_back(stream.data_fds(j));
418 // Older versions stored the data once in the protobuf instead of
419 // sending around file descriptors.
420 if (data_fds.empty() && stream.has_data()) {
421 data_fds.push_back(make_tempfile(stream.data()));
424 servers->add_stream_from_serialized(stream, data_fds);
425 deserialized_urls.insert(stream.url());
429 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
430 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
431 InputWithRefcount iwr;
432 iwr.input = create_input(loaded_state.inputs(i));
434 inputs.insert(make_pair(loaded_state.inputs(i).url(), iwr));
437 // Deserialize the acceptors.
438 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
439 deserialized_acceptors.insert(make_pair(
440 loaded_state.acceptors(i).port(),
441 new Acceptor(loaded_state.acceptors(i))));
444 log(INFO, "Deserialization done.");
447 // Add any new inputs coming from the config.
448 create_config_inputs(config, &inputs);
450 // Find all streams in the configuration file, create them, and connect to the inputs.
451 create_streams(config, deserialized_urls, &inputs);
452 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
454 // Put back the existing clients. It doesn't matter which server we
455 // allocate them to, so just do round-robin. However, we need to add
456 // them after the mark pools have been set up.
457 for (int i = 0; i < loaded_state.clients_size(); ++i) {
458 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
459 safe_close(loaded_state.clients(i).sock());
461 servers->add_client_from_serialized(loaded_state.clients(i));
467 // Now delete all inputs that are longer in use, and start the others.
468 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
469 input_it != inputs.end(); ) {
470 if (input_it->second.refcount == 0) {
471 log(WARNING, "Input '%s' no longer in use, closing.",
472 input_it->first.c_str());
473 input_it->second.input->close_socket();
474 delete input_it->second.input;
475 inputs.erase(input_it++);
477 input_it->second.input->run();
482 // Start writing statistics.
483 StatsThread *stats_thread = NULL;
484 if (!config.stats_file.empty()) {
485 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
489 InputStatsThread *input_stats_thread = NULL;
490 if (!config.input_stats_file.empty()) {
491 vector<Input*> inputs_no_refcount;
492 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
493 input_it != inputs.end(); ++input_it) {
494 inputs_no_refcount.push_back(input_it->second.input);
497 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
498 input_stats_thread->run();
501 struct timeval server_start;
502 gettimeofday(&server_start, NULL);
503 if (state_fd != -1) {
504 // Measure time from we started deserializing (below) to now, when basically everything
505 // is up and running. This is, in other words, a conservative estimate of how long our
506 // “glitch” period was, not counting of course reconnects if the configuration changed.
507 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
508 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
509 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
516 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
517 gettimeofday(&serialize_start, NULL);
519 if (input_stats_thread != NULL) {
520 input_stats_thread->stop();
521 delete input_stats_thread;
523 if (stats_thread != NULL) {
524 stats_thread->stop();
527 for (size_t i = 0; i < acceptors.size(); ++i) {
528 acceptors[i]->stop();
530 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
531 input_it != inputs.end();
533 input_it->second.input->stop();
537 CubemapStateProto state;
539 log(INFO, "Shutting down.");
541 log(INFO, "Serializing state and re-execing...");
542 state = collect_state(
543 serialize_start, acceptors, inputs, servers);
545 state.SerializeToString(&serialized);
546 state_fd = make_tempfile(serialized);
547 if (state_fd == -1) {
553 for (unsigned i = 0; i < mark_pools.size(); ++i) {
554 delete mark_pools[i];
566 // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
567 if (!dry_run_config(argv0_canon, config_filename_canon)) {
568 open_logs(config.log_destinations);
569 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
576 sprintf(buf, "%d", state_fd);
579 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
580 open_logs(config.log_destinations);
581 log_perror("execlp");
582 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);