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 CubemapStateProto collect_state(const timeval &serialize_start,
54 const vector<Acceptor *> acceptors,
55 const multimap<string, InputWithRefcount> inputs,
58 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
59 state.set_serialize_start_sec(serialize_start.tv_sec);
60 state.set_serialize_start_usec(serialize_start.tv_usec);
62 for (size_t i = 0; i < acceptors.size(); ++i) {
63 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
66 for (multimap<string, InputWithRefcount>::const_iterator input_it = inputs.begin();
67 input_it != inputs.end();
69 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
75 // Find all port statements in the configuration file, and create acceptors for htem.
76 vector<Acceptor *> create_acceptors(
78 map<int, Acceptor *> *deserialized_acceptors)
80 vector<Acceptor *> acceptors;
81 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
82 const AcceptorConfig &acceptor_config = config.acceptors[i];
83 Acceptor *acceptor = NULL;
84 map<int, Acceptor *>::iterator deserialized_acceptor_it =
85 deserialized_acceptors->find(acceptor_config.port);
86 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
87 acceptor = deserialized_acceptor_it->second;
88 deserialized_acceptors->erase(deserialized_acceptor_it);
90 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
91 acceptor = new Acceptor(server_sock, acceptor_config.port);
94 acceptors.push_back(acceptor);
97 // Close all acceptors that are no longer in the configuration file.
98 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
99 acceptor_it != deserialized_acceptors->end();
101 acceptor_it->second->close_socket();
102 delete acceptor_it->second;
108 // Find all streams in the configuration file, and create inputs for them.
109 void create_config_inputs(const Config &config, multimap<string, InputWithRefcount> *inputs)
111 for (unsigned i = 0; i < config.streams.size(); ++i) {
112 const StreamConfig &stream_config = config.streams[i];
113 if (stream_config.src.empty()) {
117 string src = stream_config.src;
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));
134 void create_streams(const Config &config,
135 const set<string> &deserialized_stream_ids,
136 multimap<string, InputWithRefcount> *inputs)
138 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
139 const MarkPoolConfig &mp_config = config.mark_pools[i];
140 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
143 set<string> expecting_stream_ids = deserialized_stream_ids;
144 for (unsigned i = 0; i < config.streams.size(); ++i) {
145 const StreamConfig &stream_config = config.streams[i];
146 if (deserialized_stream_ids.count(stream_config.stream_id) == 0) {
147 servers->add_stream(stream_config.stream_id,
148 stream_config.backlog_size,
149 Stream::Encoding(stream_config.encoding));
151 servers->set_backlog_size(stream_config.stream_id, stream_config.backlog_size);
152 servers->set_encoding(stream_config.stream_id,
153 Stream::Encoding(stream_config.encoding));
155 expecting_stream_ids.erase(stream_config.stream_id);
157 if (stream_config.mark_pool != -1) {
158 servers->set_mark_pool(stream_config.stream_id,
159 mark_pools[stream_config.mark_pool]);
162 string src = stream_config.src;
164 multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
165 assert(input_it != inputs->end());
166 input_it->second.input->add_destination(stream_config.stream_id);
167 ++input_it->second.refcount;
171 // Warn about any servers we've lost.
172 // TODO: Make an option (delete=yes?) to actually shut down streams.
173 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
174 stream_it != expecting_stream_ids.end();
176 string stream_id = *stream_it;
177 log(WARNING, "stream '%s' disappeared from the configuration file. "
178 "It will not be deleted, but clients will not get any new inputs.",
183 void open_logs(const vector<LogConfig> &log_destinations)
185 for (size_t i = 0; i < log_destinations.size(); ++i) {
186 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
187 add_log_destination_file(log_destinations[i].filename);
188 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
189 add_log_destination_console();
190 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
191 add_log_destination_syslog();
199 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
201 char *argv0_copy = strdup(argv0.c_str());
202 char *config_filename_copy = strdup(config_filename.c_str());
207 log_perror("fork()");
209 free(config_filename_copy);
213 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
214 log_perror(argv0_copy);
222 free(config_filename_copy);
227 err = waitpid(pid, &status, 0);
228 } while (err == -1 && errno == EINTR);
231 log_perror("waitpid()");
235 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
238 int main(int argc, char **argv)
242 signal(SIGPIPE, SIG_IGN);
246 bool test_config = false;
248 static const option long_options[] = {
249 { "state", required_argument, 0, 's' },
250 { "test-config", no_argument, 0, 't' },
253 int option_index = 0;
254 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
261 state_fd = atoi(optarg);
267 fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
272 string config_filename = "cubemap.config";
274 config_filename = argv[optind++];
277 // Canonicalize argv[0] and config_filename.
278 char argv0_canon[PATH_MAX];
279 char config_filename_canon[PATH_MAX];
281 if (realpath(argv[0], argv0_canon) == NULL) {
285 if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
286 log_perror(config_filename.c_str());
290 // Now parse the configuration file.
292 if (!parse_config(config_filename_canon, &config)) {
299 // Ideally we'd like to daemonize only when we've started up all threads etc.,
300 // but daemon() forks, which is not good in multithreaded software, so we'll
301 // have to do it here.
302 if (config.daemonize) {
303 if (daemon(0, 0) == -1) {
304 log_perror("daemon");
310 // Open logs as soon as possible.
311 open_logs(config.log_destinations);
313 log(INFO, "Cubemap " SERVER_VERSION " starting.");
314 if (config.access_log_file.empty()) {
315 // Create a dummy logger.
316 access_log = new AccessLogThread();
318 access_log = new AccessLogThread(config.access_log_file);
322 servers = new ServerPool(config.num_servers);
324 CubemapStateProto loaded_state;
325 struct timeval serialize_start;
326 set<string> deserialized_stream_ids;
327 map<int, Acceptor *> deserialized_acceptors;
328 multimap<string, InputWithRefcount> inputs; // multimap due to older versions without deduplication.
329 if (state_fd != -1) {
330 log(INFO, "Deserializing state from previous process...");
332 if (!read_tempfile(state_fd, &serialized)) {
335 if (!loaded_state.ParseFromString(serialized)) {
336 log(ERROR, "Failed deserialization of state.");
340 serialize_start.tv_sec = loaded_state.serialize_start_sec();
341 serialize_start.tv_usec = loaded_state.serialize_start_usec();
343 // Deserialize the streams.
344 for (int i = 0; i < loaded_state.streams_size(); ++i) {
345 const StreamProto &stream = loaded_state.streams(i);
347 vector<int> data_fds;
348 for (int j = 0; j < stream.data_fds_size(); ++j) {
349 data_fds.push_back(stream.data_fds(j));
352 // Older versions stored the data once in the protobuf instead of
353 // sending around file descriptors.
354 if (data_fds.empty() && stream.has_data()) {
355 data_fds.push_back(make_tempfile(stream.data()));
358 servers->add_stream_from_serialized(stream, data_fds);
359 deserialized_stream_ids.insert(stream.stream_id());
362 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
363 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
364 InputWithRefcount iwr;
365 iwr.input = create_input(loaded_state.inputs(i));
367 inputs.insert(make_pair(loaded_state.inputs(i).url(), iwr));
370 // Deserialize the acceptors.
371 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
372 deserialized_acceptors.insert(make_pair(
373 loaded_state.acceptors(i).port(),
374 new Acceptor(loaded_state.acceptors(i))));
377 log(INFO, "Deserialization done.");
380 // Add any new inputs coming from the config.
381 create_config_inputs(config, &inputs);
383 // Find all streams in the configuration file, create them, and connect to the inputs.
384 create_streams(config, deserialized_stream_ids, &inputs);
385 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
387 // Put back the existing clients. It doesn't matter which server we
388 // allocate them to, so just do round-robin. However, we need to add
389 // them after the mark pools have been set up.
390 for (int i = 0; i < loaded_state.clients_size(); ++i) {
391 servers->add_client_from_serialized(loaded_state.clients(i));
396 // Now delete all inputs that are longer in use, and start the others.
397 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
398 input_it != inputs.end(); ) {
399 if (input_it->second.refcount == 0) {
400 log(WARNING, "Input '%s' no longer in use, closing.",
401 input_it->first.c_str());
402 input_it->second.input->close_socket();
403 delete input_it->second.input;
404 inputs.erase(input_it++);
406 input_it->second.input->run();
411 // Start writing statistics.
412 StatsThread *stats_thread = NULL;
413 if (!config.stats_file.empty()) {
414 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
418 struct timeval server_start;
419 gettimeofday(&server_start, NULL);
420 if (state_fd != -1) {
421 // Measure time from we started deserializing (below) to now, when basically everything
422 // is up and running. This is, in other words, a conservative estimate of how long our
423 // “glitch” period was, not counting of course reconnects if the configuration changed.
424 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
425 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
426 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
433 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
434 gettimeofday(&serialize_start, NULL);
436 if (stats_thread != NULL) {
437 stats_thread->stop();
440 for (size_t i = 0; i < acceptors.size(); ++i) {
441 acceptors[i]->stop();
443 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
444 input_it != inputs.end();
446 input_it->second.input->stop();
450 CubemapStateProto state;
452 log(INFO, "Shutting down.");
454 log(INFO, "Serializing state and re-execing...");
455 state = collect_state(
456 serialize_start, acceptors, inputs, servers);
458 state.SerializeToString(&serialized);
459 state_fd = make_tempfile(serialized);
460 if (state_fd == -1) {
466 for (unsigned i = 0; i < mark_pools.size(); ++i) {
467 delete mark_pools[i];
479 // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
480 if (!dry_run_config(argv0_canon, config_filename_canon)) {
481 open_logs(config.log_destinations);
482 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
489 sprintf(buf, "%d", state_fd);
492 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
493 open_logs(config.log_destinations);
494 log_perror("execlp");
495 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);