20 #include "accesslog.h"
25 #include "serverpool.h"
34 AccessLogThread *access_log = NULL;
35 ServerPool *servers = NULL;
36 vector<MarkPool *> mark_pools;
37 volatile bool hupped = false;
38 volatile bool stopped = false;
40 struct InputWithRefcount {
48 if (signum == SIGINT) {
53 void do_nothing(int signum)
57 CubemapStateProto collect_state(const timeval &serialize_start,
58 const vector<Acceptor *> acceptors,
59 const multimap<string, InputWithRefcount> inputs,
62 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
63 state.set_serialize_start_sec(serialize_start.tv_sec);
64 state.set_serialize_start_usec(serialize_start.tv_usec);
66 for (size_t i = 0; i < acceptors.size(); ++i) {
67 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
70 for (multimap<string, InputWithRefcount>::const_iterator input_it = inputs.begin();
71 input_it != inputs.end();
73 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
79 // Find all port statements in the configuration file, and create acceptors for htem.
80 vector<Acceptor *> create_acceptors(
82 map<int, Acceptor *> *deserialized_acceptors)
84 vector<Acceptor *> acceptors;
85 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
86 const AcceptorConfig &acceptor_config = config.acceptors[i];
87 Acceptor *acceptor = NULL;
88 map<int, Acceptor *>::iterator deserialized_acceptor_it =
89 deserialized_acceptors->find(acceptor_config.port);
90 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
91 acceptor = deserialized_acceptor_it->second;
92 deserialized_acceptors->erase(deserialized_acceptor_it);
94 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
95 acceptor = new Acceptor(server_sock, acceptor_config.port);
98 acceptors.push_back(acceptor);
101 // Close all acceptors that are no longer in the configuration file.
102 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
103 acceptor_it != deserialized_acceptors->end();
105 acceptor_it->second->close_socket();
106 delete acceptor_it->second;
112 void create_config_input(const string &src, multimap<string, InputWithRefcount> *inputs)
117 if (inputs->count(src) != 0) {
121 InputWithRefcount iwr;
122 iwr.input = create_input(src);
123 if (iwr.input == NULL) {
124 log(ERROR, "did not understand URL '%s', clients will not get any data.",
129 inputs->insert(make_pair(src, iwr));
132 // Find all streams in the configuration file, and create inputs for them.
133 void create_config_inputs(const Config &config, multimap<string, InputWithRefcount> *inputs)
135 for (unsigned i = 0; i < config.streams.size(); ++i) {
136 const StreamConfig &stream_config = config.streams[i];
137 create_config_input(stream_config.src, inputs);
139 for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
140 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
141 create_config_input(udpstream_config.src, inputs);
145 void create_streams(const Config &config,
146 const set<string> &deserialized_urls,
147 multimap<string, InputWithRefcount> *inputs)
149 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
150 const MarkPoolConfig &mp_config = config.mark_pools[i];
151 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
155 set<string> expecting_urls = deserialized_urls;
156 for (unsigned i = 0; i < config.streams.size(); ++i) {
157 const StreamConfig &stream_config = config.streams[i];
159 if (deserialized_urls.count(stream_config.url) == 0) {
160 stream_index = servers->add_stream(stream_config.url,
161 stream_config.backlog_size,
162 Stream::Encoding(stream_config.encoding));
164 stream_index = servers->lookup_stream_by_url(stream_config.url);
165 assert(stream_index != -1);
166 servers->set_backlog_size(stream_index, stream_config.backlog_size);
167 servers->set_encoding(stream_index,
168 Stream::Encoding(stream_config.encoding));
170 expecting_urls.erase(stream_config.url);
172 if (stream_config.mark_pool != -1) {
173 servers->set_mark_pool(stream_index, mark_pools[stream_config.mark_pool]);
176 string src = stream_config.src;
178 multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
179 assert(input_it != inputs->end());
180 input_it->second.input->add_destination(stream_index);
181 ++input_it->second.refcount;
185 // Warn about any HTTP servers we've lost.
186 // TODO: Make an option (delete=yes?) to actually shut down streams.
187 for (set<string>::const_iterator stream_it = expecting_urls.begin();
188 stream_it != expecting_urls.end();
190 string url = *stream_it;
191 log(WARNING, "stream '%s' disappeared from the configuration file. "
192 "It will not be deleted, but clients will not get any new inputs.",
197 for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
198 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
199 MarkPool *mark_pool = NULL;
200 if (udpstream_config.mark_pool != -1) {
201 mark_pool = mark_pools[udpstream_config.mark_pool];
203 int stream_index = servers->add_udpstream(udpstream_config.dst, mark_pool);
205 string src = udpstream_config.src;
207 multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
208 assert(input_it != inputs->end());
209 input_it->second.input->add_destination(stream_index);
210 ++input_it->second.refcount;
215 void open_logs(const vector<LogConfig> &log_destinations)
217 for (size_t i = 0; i < log_destinations.size(); ++i) {
218 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
219 add_log_destination_file(log_destinations[i].filename);
220 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
221 add_log_destination_console();
222 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
223 add_log_destination_syslog();
231 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
233 char *argv0_copy = strdup(argv0.c_str());
234 char *config_filename_copy = strdup(config_filename.c_str());
239 log_perror("fork()");
241 free(config_filename_copy);
245 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
246 log_perror(argv0_copy);
254 free(config_filename_copy);
259 err = waitpid(pid, &status, 0);
260 } while (err == -1 && errno == EINTR);
263 log_perror("waitpid()");
267 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
270 int main(int argc, char **argv)
274 signal(SIGUSR1, do_nothing); // Used in internal signalling.
275 signal(SIGPIPE, SIG_IGN);
279 bool test_config = false;
281 static const option long_options[] = {
282 { "state", required_argument, 0, 's' },
283 { "test-config", no_argument, 0, 't' },
286 int option_index = 0;
287 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
294 state_fd = atoi(optarg);
300 fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
305 string config_filename = "cubemap.config";
307 config_filename = argv[optind++];
310 // Canonicalize argv[0] and config_filename.
311 char argv0_canon[PATH_MAX];
312 char config_filename_canon[PATH_MAX];
314 if (realpath(argv[0], argv0_canon) == NULL) {
318 if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
319 log_perror(config_filename.c_str());
323 // Now parse the configuration file.
325 if (!parse_config(config_filename_canon, &config)) {
332 // Ideally we'd like to daemonize only when we've started up all threads etc.,
333 // but daemon() forks, which is not good in multithreaded software, so we'll
334 // have to do it here.
335 if (config.daemonize) {
336 if (daemon(0, 0) == -1) {
337 log_perror("daemon");
343 // Open logs as soon as possible.
344 open_logs(config.log_destinations);
346 log(INFO, "Cubemap " SERVER_VERSION " starting.");
347 if (config.access_log_file.empty()) {
348 // Create a dummy logger.
349 access_log = new AccessLogThread();
351 access_log = new AccessLogThread(config.access_log_file);
355 servers = new ServerPool(config.num_servers);
357 CubemapStateProto loaded_state;
358 struct timeval serialize_start;
359 set<string> deserialized_urls;
360 map<int, Acceptor *> deserialized_acceptors;
361 multimap<string, InputWithRefcount> inputs; // multimap due to older versions without deduplication.
362 if (state_fd != -1) {
363 log(INFO, "Deserializing state from previous process...");
365 if (!read_tempfile(state_fd, &serialized)) {
368 if (!loaded_state.ParseFromString(serialized)) {
369 log(ERROR, "Failed deserialization of state.");
373 serialize_start.tv_sec = loaded_state.serialize_start_sec();
374 serialize_start.tv_usec = loaded_state.serialize_start_usec();
376 // Deserialize the streams.
377 for (int i = 0; i < loaded_state.streams_size(); ++i) {
378 const StreamProto &stream = loaded_state.streams(i);
380 vector<int> data_fds;
381 for (int j = 0; j < stream.data_fds_size(); ++j) {
382 data_fds.push_back(stream.data_fds(j));
385 // Older versions stored the data once in the protobuf instead of
386 // sending around file descriptors.
387 if (data_fds.empty() && stream.has_data()) {
388 data_fds.push_back(make_tempfile(stream.data()));
391 servers->add_stream_from_serialized(stream, data_fds);
392 deserialized_urls.insert(stream.url());
395 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
396 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
397 InputWithRefcount iwr;
398 iwr.input = create_input(loaded_state.inputs(i));
400 inputs.insert(make_pair(loaded_state.inputs(i).url(), iwr));
403 // Deserialize the acceptors.
404 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
405 deserialized_acceptors.insert(make_pair(
406 loaded_state.acceptors(i).port(),
407 new Acceptor(loaded_state.acceptors(i))));
410 log(INFO, "Deserialization done.");
413 // Add any new inputs coming from the config.
414 create_config_inputs(config, &inputs);
416 // Find all streams in the configuration file, create them, and connect to the inputs.
417 create_streams(config, deserialized_urls, &inputs);
418 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
420 // Put back the existing clients. It doesn't matter which server we
421 // allocate them to, so just do round-robin. However, we need to add
422 // them after the mark pools have been set up.
423 for (int i = 0; i < loaded_state.clients_size(); ++i) {
424 servers->add_client_from_serialized(loaded_state.clients(i));
429 // Now delete all inputs that are longer in use, and start the others.
430 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
431 input_it != inputs.end(); ) {
432 if (input_it->second.refcount == 0) {
433 log(WARNING, "Input '%s' no longer in use, closing.",
434 input_it->first.c_str());
435 input_it->second.input->close_socket();
436 delete input_it->second.input;
437 inputs.erase(input_it++);
439 input_it->second.input->run();
444 // Start writing statistics.
445 StatsThread *stats_thread = NULL;
446 if (!config.stats_file.empty()) {
447 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
451 struct timeval server_start;
452 gettimeofday(&server_start, NULL);
453 if (state_fd != -1) {
454 // Measure time from we started deserializing (below) to now, when basically everything
455 // is up and running. This is, in other words, a conservative estimate of how long our
456 // “glitch” period was, not counting of course reconnects if the configuration changed.
457 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
458 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
459 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
466 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
467 gettimeofday(&serialize_start, NULL);
469 if (stats_thread != NULL) {
470 stats_thread->stop();
473 for (size_t i = 0; i < acceptors.size(); ++i) {
474 acceptors[i]->stop();
476 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
477 input_it != inputs.end();
479 input_it->second.input->stop();
483 CubemapStateProto state;
485 log(INFO, "Shutting down.");
487 log(INFO, "Serializing state and re-execing...");
488 state = collect_state(
489 serialize_start, acceptors, inputs, servers);
491 state.SerializeToString(&serialized);
492 state_fd = make_tempfile(serialized);
493 if (state_fd == -1) {
499 for (unsigned i = 0; i < mark_pools.size(); ++i) {
500 delete mark_pools[i];
512 // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
513 if (!dry_run_config(argv0_canon, config_filename_canon)) {
514 open_logs(config.log_destinations);
515 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
522 sprintf(buf, "%d", state_fd);
525 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
526 open_logs(config.log_destinations);
527 log_perror("execlp");
528 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);