12 #include <systemd/sd-daemon.h>
24 #include "accesslog.h"
27 #include "input_stats.h"
29 #include "sa_compare.h"
30 #include "serverpool.h"
39 AccessLogThread *access_log = nullptr;
40 ServerPool *servers = nullptr;
41 volatile bool hupped = false;
42 volatile bool stopped = false;
44 typedef pair<string, Input::Encoding> InputKey;
48 struct OrderByConnectionTime {
49 bool operator() (const ClientProto &a, const ClientProto &b) const {
50 if (a.connect_time_sec() != b.connect_time_sec())
51 return a.connect_time_sec() < b.connect_time_sec();
52 return a.connect_time_nsec() < b.connect_time_nsec();
56 // An arbitrary ordering.
57 struct AcceptorConfigCompare {
58 bool operator() (const AcceptorConfig &a, const AcceptorConfig &b) const {
59 int cmp = a.certificate_chain.compare(b.certificate_chain);
64 cmp = a.private_key.compare(b.private_key);
69 return Sockaddr6Compare()(a.addr, b.addr);
75 struct InputWithRefcount {
83 if (signum == SIGINT) {
88 void do_nothing(int signum)
92 CubemapStateProto collect_state(const timespec &serialize_start,
93 const vector<Acceptor *> acceptors,
94 const multimap<InputKey, InputWithRefcount> inputs,
97 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
98 state.set_serialize_start_sec(serialize_start.tv_sec);
99 state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
101 for (Acceptor *acceptor : acceptors) {
102 state.add_acceptors()->MergeFrom(acceptor->serialize());
105 for (const auto &key_and_input_with_refcount : inputs) {
106 state.add_inputs()->MergeFrom(key_and_input_with_refcount.second.input->serialize());
112 // Find all port statements in the configuration file, and create acceptors for them.
113 vector<Acceptor *> create_acceptors(
114 const Config &config,
115 map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> *deserialized_acceptors)
117 vector<Acceptor *> acceptors;
118 for (const AcceptorConfig &acceptor_config : config.acceptors) {
119 Acceptor *acceptor = nullptr;
120 const auto deserialized_acceptor_it = deserialized_acceptors->find(acceptor_config);
121 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
122 acceptor = deserialized_acceptor_it->second;
123 deserialized_acceptors->erase(deserialized_acceptor_it);
125 int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
126 acceptor = new Acceptor(server_sock, acceptor_config.addr,
127 acceptor_config.certificate_chain,
128 acceptor_config.private_key);
131 acceptors.push_back(acceptor);
134 // Close all acceptors that are no longer in the configuration file.
135 for (auto &config_and_acceptor : *deserialized_acceptors) {
136 config_and_acceptor.second->close_socket();
137 delete config_and_acceptor.second;
143 void create_config_input(const string &src, Input::Encoding encoding, multimap<InputKey, InputWithRefcount> *inputs)
148 InputKey key(src, encoding);
149 if (inputs->count(key) != 0) {
153 InputWithRefcount iwr;
154 iwr.input = create_input(src, encoding);
155 if (iwr.input == nullptr) {
156 log(ERROR, "did not understand URL '%s' or source encoding was invalid, clients will not get any data.",
161 inputs->insert(make_pair(key, iwr));
164 // Find all streams in the configuration file, and create inputs for them.
165 void create_config_inputs(const Config &config, multimap<InputKey, InputWithRefcount> *inputs)
167 for (const StreamConfig &stream_config : config.streams) {
168 if (stream_config.src != "delete") {
169 create_config_input(stream_config.src, Input::Encoding(stream_config.src_encoding), inputs);
172 for (const UDPStreamConfig &udpstream_config : config.udpstreams) {
173 create_config_input(udpstream_config.src, Input::INPUT_ENCODING_RAW, inputs);
177 void create_streams(const Config &config,
178 const set<string> &deserialized_urls,
179 multimap<InputKey, InputWithRefcount> *inputs)
182 set<string> expecting_urls = deserialized_urls;
183 for (const StreamConfig &stream_config : config.streams) {
186 expecting_urls.erase(stream_config.url);
188 // Special-case deleted streams; they were never deserialized in the first place,
189 // so just ignore them.
190 if (stream_config.src == "delete") {
194 if (deserialized_urls.count(stream_config.url) == 0) {
195 stream_index = servers->add_stream(stream_config.url,
196 stream_config.backlog_size,
197 stream_config.prebuffering_bytes,
198 Stream::Encoding(stream_config.encoding),
199 Stream::Encoding(stream_config.src_encoding));
201 stream_index = servers->lookup_stream_by_url(stream_config.url);
202 assert(stream_index != -1);
203 servers->set_backlog_size(stream_index, stream_config.backlog_size);
204 servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
205 servers->set_encoding(stream_index,
206 Stream::Encoding(stream_config.encoding));
207 servers->set_src_encoding(stream_index,
208 Stream::Encoding(stream_config.src_encoding));
211 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
213 string src = stream_config.src;
214 Input::Encoding src_encoding = Input::Encoding(stream_config.src_encoding);
216 const auto input_it = inputs->find(make_pair(src, src_encoding));
217 if (input_it != inputs->end()) {
218 input_it->second.input->add_destination(stream_index);
219 ++input_it->second.refcount;
224 // Warn about any streams servers we've lost.
225 for (const string &url : expecting_urls) {
226 log(WARNING, "stream '%s' disappeared from the configuration file. "
227 "It will not be deleted, but clients will not get any new inputs. "
228 "If you really meant to delete it, set src=delete and reload.",
233 for (const UDPStreamConfig &udpstream_config : config.udpstreams) {
234 int stream_index = servers->add_udpstream(
235 udpstream_config.dst,
236 udpstream_config.pacing_rate,
237 udpstream_config.ttl,
238 udpstream_config.multicast_iface_index);
240 string src = udpstream_config.src;
242 auto input_it = inputs->find(make_pair(src, Input::INPUT_ENCODING_RAW));
243 assert(input_it != inputs->end());
244 input_it->second.input->add_destination(stream_index);
245 ++input_it->second.refcount;
249 // HTTP gen204 endpoints.
250 for (const Gen204Config &ping_config : config.pings) {
251 servers->add_gen204(ping_config.url, ping_config.allow_origin);
255 void open_logs(const vector<LogConfig> &log_destinations)
257 for (const LogConfig &log_destination : log_destinations) {
258 if (log_destination.type == LogConfig::LOG_TYPE_FILE) {
259 add_log_destination_file(log_destination.filename);
260 } else if (log_destination.type == LogConfig::LOG_TYPE_CONSOLE) {
261 add_log_destination_console();
262 } else if (log_destination.type == LogConfig::LOG_TYPE_SYSLOG) {
263 add_log_destination_syslog();
271 bool dry_run_config(const string &argv0, const string &config_filename)
273 char *argv0_copy = strdup(argv0.c_str());
274 char *config_filename_copy = strdup(config_filename.c_str());
279 log_perror("fork()");
281 free(config_filename_copy);
285 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, nullptr);
286 log_perror(argv0_copy);
294 free(config_filename_copy);
299 err = waitpid(pid, &status, 0);
300 } while (err == -1 && errno == EINTR);
303 log_perror("waitpid()");
307 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
310 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
312 for (const StreamConfig &stream_config : config.streams) {
313 if (stream_config.src == "delete") {
314 log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
315 deleted_urls->insert(stream_config.url);
320 int main(int argc, char **argv)
324 signal(SIGUSR1, do_nothing); // Used in internal signalling.
325 signal(SIGPIPE, SIG_IGN);
331 bool test_config = false;
333 static const option long_options[] = {
334 { "state", required_argument, 0, 's' },
335 { "test-config", no_argument, 0, 't' },
338 int option_index = 0;
339 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
346 state_fd = atoi(optarg);
352 fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
357 string config_filename = "cubemap.config";
359 config_filename = argv[optind++];
362 // Canonicalize argv[0] and config_filename.
363 char argv0_canon[PATH_MAX];
364 char config_filename_canon[PATH_MAX];
366 if (realpath("/proc/self/exe", argv0_canon) == nullptr) {
370 if (realpath(config_filename.c_str(), config_filename_canon) == nullptr) {
371 log_perror(config_filename.c_str());
375 // Now parse the configuration file.
377 if (!parse_config(config_filename_canon, &config)) {
384 // Ideally we'd like to daemonize only when we've started up all threads etc.,
385 // but daemon() forks, which is not good in multithreaded software, so we'll
386 // have to do it here.
387 if (config.daemonize) {
388 if (daemon(0, 0) == -1) {
389 log_perror("daemon");
395 // Open logs as soon as possible.
396 open_logs(config.log_destinations);
398 log(INFO, "Cubemap " SERVER_VERSION " starting.");
399 if (config.access_log_file.empty()) {
400 // Create a dummy logger.
401 access_log = new AccessLogThread();
403 access_log = new AccessLogThread(config.access_log_file);
407 servers = new ServerPool(config.num_servers);
409 // Find all the streams that are to be deleted.
410 set<string> deleted_urls;
411 find_deleted_streams(config, &deleted_urls);
413 CubemapStateProto loaded_state;
414 timespec serialize_start;
415 set<string> deserialized_urls;
416 map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> deserialized_acceptors;
417 multimap<InputKey, InputWithRefcount> inputs; // multimap due to older versions without deduplication.
418 if (state_fd != -1) {
419 log(INFO, "Deserializing state from previous process...");
421 if (!read_tempfile_and_close(state_fd, &serialized)) {
424 if (!loaded_state.ParseFromString(serialized)) {
425 log(ERROR, "Failed deserialization of state.");
429 serialize_start.tv_sec = loaded_state.serialize_start_sec();
430 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
432 // Deserialize the streams.
433 map<string, string> stream_headers_for_url; // See below.
434 for (const StreamProto &stream : loaded_state.streams()) {
435 if (deleted_urls.count(stream.url()) != 0) {
436 // Delete the stream backlogs.
437 for (const int fd : stream.data_fds()) {
441 vector<int> data_fds;
442 for (const int fd : stream.data_fds()) {
443 data_fds.push_back(fd);
446 servers->add_stream_from_serialized(stream, data_fds);
447 deserialized_urls.insert(stream.url());
449 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
453 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
454 for (const InputProto &serialized_input : loaded_state.inputs()) {
455 InputWithRefcount iwr;
456 iwr.input = create_input(serialized_input);
459 Input::Encoding src_encoding = serialized_input.is_metacube_encoded() ?
460 Input::INPUT_ENCODING_METACUBE :
461 Input::INPUT_ENCODING_RAW;
462 InputKey key(serialized_input.url(), src_encoding);
463 inputs.insert(make_pair(key, iwr));
466 // Deserialize the acceptors.
467 for (const AcceptorProto &serialized_acceptor : loaded_state.acceptors()) {
468 AcceptorConfig config;
469 config.addr = extract_address_from_acceptor_proto(serialized_acceptor);
470 config.certificate_chain = serialized_acceptor.certificate_chain();
471 config.private_key = serialized_acceptor.private_key();
472 deserialized_acceptors.insert(make_pair(
474 new Acceptor(serialized_acceptor)));
477 log(INFO, "Deserialization done.");
480 // Add any new inputs coming from the config.
481 create_config_inputs(config, &inputs);
483 // Find all streams in the configuration file, create them, and connect to the inputs.
484 create_streams(config, deserialized_urls, &inputs);
485 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
487 // Make all the servers create TLS contexts for every TLS keypair we have.
488 for (Acceptor *acceptor : acceptors) {
489 if (acceptor->is_tls()) {
490 servers->create_tls_context_for_acceptor(acceptor);
494 // Put back the existing clients. It doesn't matter which server we
495 // allocate them to, so just do round-robin. However, we need to sort them
496 // by connection time first, since add_client_serialized() expects that.
497 sort(loaded_state.mutable_clients()->begin(),
498 loaded_state.mutable_clients()->end(),
499 OrderByConnectionTime());
500 for (int i = 0; i < loaded_state.clients_size(); ++i) {
501 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
502 safe_close(loaded_state.clients(i).sock());
504 servers->add_client_from_serialized(loaded_state.clients(i));
510 // Now delete all inputs that are longer in use, and start the others.
511 for (auto input_it = inputs.begin(); input_it != inputs.end(); ) {
512 if (input_it->second.refcount == 0) {
513 if (input_it->first.second == Input::INPUT_ENCODING_RAW) {
514 log(WARNING, "Raw input '%s' no longer in use, closing.",
515 input_it->first.first.c_str());
517 assert(input_it->first.second == Input::INPUT_ENCODING_METACUBE);
518 log(WARNING, "Metacube input '%s' no longer in use, closing.",
519 input_it->first.first.c_str());
521 input_it->second.input->close_socket();
522 delete input_it->second.input;
523 inputs.erase(input_it++);
525 input_it->second.input->run();
530 // Start writing statistics.
531 unique_ptr<StatsThread> stats_thread;
532 if (!config.stats_file.empty()) {
533 stats_thread.reset(new StatsThread(config.stats_file, config.stats_interval));
537 unique_ptr<InputStatsThread> input_stats_thread;
538 if (!config.input_stats_file.empty()) {
539 vector<Input*> inputs_no_refcount;
540 for (const auto &key_and_input_with_refcount : inputs) {
541 inputs_no_refcount.push_back(key_and_input_with_refcount.second.input);
544 input_stats_thread.reset(new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount));
545 input_stats_thread->run();
548 timespec server_start;
549 int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
551 if (state_fd != -1) {
552 // Measure time from we started deserializing (below) to now, when basically everything
553 // is up and running. This is, in other words, a conservative estimate of how long our
554 // “glitch” period was, not counting of course reconnects if the configuration changed.
555 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
556 1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
557 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
560 sd_notify(0, "READY=1");
567 sd_notify(0, "STOPPING=1");
569 sd_notify(0, "RELOADING=1");
572 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
573 err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
576 if (input_stats_thread != nullptr) {
577 input_stats_thread->stop();
578 input_stats_thread.reset();
580 if (stats_thread != nullptr) {
581 stats_thread->stop();
582 stats_thread.reset();
584 for (Acceptor *acceptor : acceptors) {
587 for (const auto &key_and_input_with_refcount : inputs) {
588 key_and_input_with_refcount.second.input->stop();
592 CubemapStateProto state;
594 log(INFO, "Shutting down.");
596 log(INFO, "Serializing state and re-execing...");
597 state = collect_state(
598 serialize_start, acceptors, inputs, servers);
600 state.SerializeToString(&serialized);
601 state_fd = make_tempfile(serialized);
602 if (state_fd == -1) {
616 // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
617 if (!dry_run_config(argv0_canon, config_filename_canon)) {
618 open_logs(config.log_destinations);
619 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
626 sprintf(buf, "%d", state_fd);
629 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, nullptr);
630 open_logs(config.log_destinations);
631 log_perror("execlp");
632 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);