git.sesse.net Git - cubemap/blob - main.cpp

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <getopt.h>
   4 #include <limits.h>
   5 #include <signal.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/time.h>
  11 #include <sys/wait.h>
  12 #include <systemd/sd-daemon.h>
  13 #include <unistd.h>
  14 #include <algorithm>
  15 #include <map>
  16 #include <set>
  17 #include <string>
  18 #include <utility>
  19 #include <vector>
  20
  21 #include "acceptor.h"
  22 #include "accesslog.h"
  23 #include "config.h"
  24 #include "input.h"
  25 #include "input_stats.h"
  26 #include "log.h"
  27 #include "sa_compare.h"
  28 #include "serverpool.h"
  29 #include "state.pb.h"
  30 #include "stats.h"
  31 #include "stream.h"
  32 #include "util.h"
  33 #include "version.h"
  34
  35 using namespace std;
  36
  37 AccessLogThread *access_log = NULL;
  38 ServerPool *servers = NULL;
  39 volatile bool hupped = false;
  40 volatile bool stopped = false;
  41
  42 namespace {
  43
  44 struct OrderByConnectionTime {
  45         bool operator() (const ClientProto &a, const ClientProto &b) const {
  46                 if (a.connect_time_sec() != b.connect_time_sec())
  47                         return a.connect_time_sec() < b.connect_time_sec();
  48                 return a.connect_time_nsec() < b.connect_time_nsec();
  49         }
  50 };
  51
  52 }  // namespace
  53
  54 struct InputWithRefcount {
  55         Input *input;
  56         int refcount;
  57 };
  58
  59 void hup(int signum)
  60 {
  61         hupped = true;
  62         if (signum == SIGINT) {
  63                 stopped = true;
  64         }
  65 }
  66
  67 void do_nothing(int signum)
  68 {
  69 }
  70
  71 CubemapStateProto collect_state(const timespec &serialize_start,
  72                                 const vector<Acceptor *> acceptors,
  73                                 const multimap<string, InputWithRefcount> inputs,
  74                                 ServerPool *servers)
  75 {
  76         CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
  77         state.set_serialize_start_sec(serialize_start.tv_sec);
  78         state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
  79
  80         for (size_t i = 0; i < acceptors.size(); ++i) {
  81                 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
  82         }
  83
  84         for (multimap<string, InputWithRefcount>::const_iterator input_it = inputs.begin();
  85              input_it != inputs.end();
  86              ++input_it) {
  87                 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
  88         }
  89
  90         return state;
  91 }
  92
  93 // Find all port statements in the configuration file, and create acceptors for htem.
  94 vector<Acceptor *> create_acceptors(
  95         const Config &config,
  96         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> *deserialized_acceptors)
  97 {
  98         vector<Acceptor *> acceptors;
  99         for (unsigned i = 0; i < config.acceptors.size(); ++i) {
 100                 const AcceptorConfig &acceptor_config = config.acceptors[i];
 101                 Acceptor *acceptor = NULL;
 102                 map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator deserialized_acceptor_it =
 103                         deserialized_acceptors->find(acceptor_config.addr);
 104                 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
 105                         acceptor = deserialized_acceptor_it->second;
 106                         deserialized_acceptors->erase(deserialized_acceptor_it);
 107                 } else {
 108                         int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
 109                         acceptor = new Acceptor(server_sock, acceptor_config.addr);
 110                 }
 111                 acceptor->run();
 112                 acceptors.push_back(acceptor);
 113         }
 114
 115         // Close all acceptors that are no longer in the configuration file.
 116         for (map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator
 117                  acceptor_it = deserialized_acceptors->begin();
 118              acceptor_it != deserialized_acceptors->end();
 119              ++acceptor_it) {
 120                 acceptor_it->second->close_socket();
 121                 delete acceptor_it->second;
 122         }
 123
 124         return acceptors;
 125 }
 126
 127 void create_config_input(const string &src, multimap<string, InputWithRefcount> *inputs)
 128 {
 129         if (src.empty()) {
 130                 return;
 131         }
 132         if (inputs->count(src) != 0) {
 133                 return;
 134         }
 135
 136         InputWithRefcount iwr;
 137         iwr.input = create_input(src);
 138         if (iwr.input == NULL) {
 139                 log(ERROR, "did not understand URL '%s', clients will not get any data.",
 140                         src.c_str());
 141                 return;
 142         }
 143         iwr.refcount = 0;
 144         inputs->insert(make_pair(src, iwr));
 145 }
 146
 147 // Find all streams in the configuration file, and create inputs for them.
 148 void create_config_inputs(const Config &config, multimap<string, InputWithRefcount> *inputs)
 149 {
 150         for (unsigned i = 0; i < config.streams.size(); ++i) {
 151                 const StreamConfig &stream_config = config.streams[i];
 152                 if (stream_config.src != "delete") {
 153                         create_config_input(stream_config.src, inputs);
 154                 }
 155         }
 156         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 157                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 158                 create_config_input(udpstream_config.src, inputs);
 159         }
 160 }
 161
 162 void create_streams(const Config &config,
 163                     const set<string> &deserialized_urls,
 164                     multimap<string, InputWithRefcount> *inputs)
 165 {
 166         // HTTP streams.
 167         set<string> expecting_urls = deserialized_urls;
 168         for (unsigned i = 0; i < config.streams.size(); ++i) {
 169                 const StreamConfig &stream_config = config.streams[i];
 170                 int stream_index;
 171
 172                 expecting_urls.erase(stream_config.url);
 173
 174                 // Special-case deleted streams; they were never deserialized in the first place,
 175                 // so just ignore them.
 176                 if (stream_config.src == "delete") {
 177                         continue;
 178                 }
 179
 180                 if (deserialized_urls.count(stream_config.url) == 0) {
 181                         stream_index = servers->add_stream(stream_config.url,
 182                                                            stream_config.backlog_size,
 183                                                            stream_config.prebuffering_bytes,
 184                                                            Stream::Encoding(stream_config.encoding));
 185                 } else {
 186                         stream_index = servers->lookup_stream_by_url(stream_config.url);
 187                         assert(stream_index != -1);
 188                         servers->set_backlog_size(stream_index, stream_config.backlog_size);
 189                         servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
 190                         servers->set_encoding(stream_index,
 191                                               Stream::Encoding(stream_config.encoding));
 192                 }
 193
 194                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
 195
 196                 string src = stream_config.src;
 197                 if (!src.empty()) {
 198                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 199                         if (input_it != inputs->end()) {
 200                                 input_it->second.input->add_destination(stream_index);
 201                                 ++input_it->second.refcount;
 202                         }
 203                 }
 204         }
 205
 206         // Warn about any streams servers we've lost.
 207         for (set<string>::const_iterator stream_it = expecting_urls.begin();
 208              stream_it != expecting_urls.end();
 209              ++stream_it) {
 210                 string url = *stream_it;
 211                 log(WARNING, "stream '%s' disappeared from the configuration file. "
 212                              "It will not be deleted, but clients will not get any new inputs. "
 213                              "If you really meant to delete it, set src=delete and reload.",
 214                              url.c_str());
 215         }
 216
 217         // UDP streams.
 218         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 219                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 220                 int stream_index = servers->add_udpstream(
 221                         udpstream_config.dst,
 222                         udpstream_config.pacing_rate,
 223                         udpstream_config.ttl,
 224                         udpstream_config.multicast_iface_index);
 225
 226                 string src = udpstream_config.src;
 227                 if (!src.empty()) {
 228                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 229                         assert(input_it != inputs->end());
 230                         input_it->second.input->add_destination(stream_index);
 231                         ++input_it->second.refcount;
 232                 }
 233         }
 234 }
 235
 236 void open_logs(const vector<LogConfig> &log_destinations)
 237 {
 238         for (size_t i = 0; i < log_destinations.size(); ++i) {
 239                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
 240                         add_log_destination_file(log_destinations[i].filename);
 241                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
 242                         add_log_destination_console();
 243                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
 244                         add_log_destination_syslog();
 245                 } else {
 246                         assert(false);
 247                 }
 248         }
 249         start_logging();
 250 }
 251
 252 bool dry_run_config(const string &argv0, const string &config_filename)
 253 {
 254         char *argv0_copy = strdup(argv0.c_str());
 255         char *config_filename_copy = strdup(config_filename.c_str());
 256
 257         pid_t pid = fork();
 258         switch (pid) {
 259         case -1:
 260                 log_perror("fork()");
 261                 free(argv0_copy);
 262                 free(config_filename_copy);
 263                 return false;
 264         case 0:
 265                 // Child.
 266                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
 267                 log_perror(argv0_copy);
 268                 _exit(1);
 269         default:
 270                 // Parent.
 271                 break;
 272         }
 273
 274         free(argv0_copy);
 275         free(config_filename_copy);
 276
 277         int status;
 278         pid_t err;
 279         do {
 280                 err = waitpid(pid, &status, 0);
 281         } while (err == -1 && errno == EINTR);
 282
 283         if (err == -1) {
 284                 log_perror("waitpid()");
 285                 return false;
 286         }
 287
 288         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 289 }
 290
 291 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 292 {
 293         for (unsigned i = 0; i < config.streams.size(); ++i) {
 294                 const StreamConfig &stream_config = config.streams[i];
 295                 if (stream_config.src == "delete") {
 296                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 297                         deleted_urls->insert(stream_config.url);
 298                 }
 299         }
 300 }
 301
 302 int main(int argc, char **argv)
 303 {
 304         signal(SIGHUP, hup);
 305         signal(SIGINT, hup);
 306         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 307         signal(SIGPIPE, SIG_IGN);
 308
 309         // Parse options.
 310         int state_fd = -1;
 311         bool test_config = false;
 312         for ( ;; ) {
 313                 static const option long_options[] = {
 314                         { "state", required_argument, 0, 's' },
 315                         { "test-config", no_argument, 0, 't' },
 316                         { 0, 0, 0, 0 }
 317                 };
 318                 int option_index = 0;
 319                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 320
 321                 if (c == -1) {
 322                         break;
 323                 }
 324                 switch (c) {
 325                 case 's':
 326                         state_fd = atoi(optarg);
 327                         break;
 328                 case 't':
 329                         test_config = true;
 330                         break;
 331                 default:
 332                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 333                         exit(1);
 334                 }
 335         }
 336
 337         string config_filename = "cubemap.config";
 338         if (optind < argc) {
 339                 config_filename = argv[optind++];
 340         }
 341
 342         // Canonicalize argv[0] and config_filename.
 343         char argv0_canon[PATH_MAX];
 344         char config_filename_canon[PATH_MAX];
 345
 346         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
 347                 log_perror(argv[0]);
 348                 exit(1);
 349         }
 350         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
 351                 log_perror(config_filename.c_str());
 352                 exit(1);
 353         }
 354
 355         // Now parse the configuration file.
 356         Config config;
 357         if (!parse_config(config_filename_canon, &config)) {
 358                 exit(1);
 359         }
 360         if (test_config) {
 361                 exit(0);
 362         }
 363
 364         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 365         // but daemon() forks, which is not good in multithreaded software, so we'll
 366         // have to do it here.
 367         if (config.daemonize) {
 368                 if (daemon(0, 0) == -1) {
 369                         log_perror("daemon");
 370                         exit(1);
 371                 }
 372         }
 373
 374 start:
 375         // Open logs as soon as possible.
 376         open_logs(config.log_destinations);
 377
 378         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 379         if (config.access_log_file.empty()) {
 380                 // Create a dummy logger.
 381                 access_log = new AccessLogThread();
 382         } else {
 383                 access_log = new AccessLogThread(config.access_log_file);
 384         }
 385         access_log->run();
 386
 387         servers = new ServerPool(config.num_servers);
 388
 389         // Find all the streams that are to be deleted.
 390         set<string> deleted_urls;
 391         find_deleted_streams(config, &deleted_urls);
 392
 393         CubemapStateProto loaded_state;
 394         timespec serialize_start;
 395         set<string> deserialized_urls;
 396         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
 397         multimap<string, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 398         if (state_fd != -1) {
 399                 log(INFO, "Deserializing state from previous process...");
 400                 string serialized;
 401                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 402                         exit(1);
 403                 }
 404                 if (!loaded_state.ParseFromString(serialized)) {
 405                         log(ERROR, "Failed deserialization of state.");
 406                         exit(1);
 407                 }
 408
 409                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 410                 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
 411
 412                 // Deserialize the streams.
 413                 map<string, string> stream_headers_for_url;  // See below.
 414                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
 415                         const StreamProto &stream = loaded_state.streams(i);
 416
 417                         if (deleted_urls.count(stream.url()) != 0) {
 418                                 // Delete the stream backlogs.
 419                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 420                                         safe_close(stream.data_fds(j));
 421                                 }
 422                         } else {
 423                                 vector<int> data_fds;
 424                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 425                                         data_fds.push_back(stream.data_fds(j));
 426                                 }
 427
 428                                 servers->add_stream_from_serialized(stream, data_fds);
 429                                 deserialized_urls.insert(stream.url());
 430
 431                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 432                         }
 433                 }
 434
 435                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 436                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
 437                         InputProto serialized_input = loaded_state.inputs(i);
 438
 439                         InputWithRefcount iwr;
 440                         iwr.input = create_input(serialized_input);
 441                         iwr.refcount = 0;
 442                         inputs.insert(make_pair(serialized_input.url(), iwr));
 443                 }
 444
 445                 // Deserialize the acceptors.
 446                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
 447                         sockaddr_in6 sin6 = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
 448                         deserialized_acceptors.insert(make_pair(
 449                                 sin6,
 450                                 new Acceptor(loaded_state.acceptors(i))));
 451                 }
 452
 453                 log(INFO, "Deserialization done.");
 454         }
 455
 456         // Add any new inputs coming from the config.
 457         create_config_inputs(config, &inputs);
 458
 459         // Find all streams in the configuration file, create them, and connect to the inputs.
 460         create_streams(config, deserialized_urls, &inputs);
 461         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 462
 463         // Convert old-style timestamps to new-style timestamps for all clients;
 464         // this simplifies the sort below.
 465         {
 466                 timespec now_monotonic;
 467                 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &now_monotonic) == -1) {
 468                         log(ERROR, "clock_gettime(CLOCK_MONOTONIC_COARSE) failed.");
 469                         exit(1);
 470                 }
 471                 long delta_sec = now_monotonic.tv_sec - time(NULL);
 472
 473                 for (int i = 0; i < loaded_state.clients_size(); ++i) {
 474                         ClientProto* client = loaded_state.mutable_clients(i);
 475                         if (client->has_connect_time_old()) {
 476                                 client->set_connect_time_sec(client->connect_time_old() + delta_sec);
 477                                 client->set_connect_time_nsec(now_monotonic.tv_nsec);
 478                                 client->clear_connect_time_old();
 479                         }
 480                 }
 481         }
 482
 483         // Put back the existing clients. It doesn't matter which server we
 484         // allocate them to, so just do round-robin. However, we need to sort them
 485         // by connection time first, since add_client_serialized() expects that.
 486         sort(loaded_state.mutable_clients()->begin(),
 487              loaded_state.mutable_clients()->end(),
 488              OrderByConnectionTime());
 489         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 490                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 491                         safe_close(loaded_state.clients(i).sock());
 492                 } else {
 493                         servers->add_client_from_serialized(loaded_state.clients(i));
 494                 }
 495         }
 496
 497         servers->run();
 498
 499         // Now delete all inputs that are longer in use, and start the others.
 500         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 501              input_it != inputs.end(); ) {
 502                 if (input_it->second.refcount == 0) {
 503                         log(WARNING, "Input '%s' no longer in use, closing.",
 504                             input_it->first.c_str());
 505                         input_it->second.input->close_socket();
 506                         delete input_it->second.input;
 507                         inputs.erase(input_it++);
 508                 } else {
 509                         input_it->second.input->run();
 510                         ++input_it;
 511                 }
 512         }
 513
 514         // Start writing statistics.
 515         StatsThread *stats_thread = NULL;
 516         if (!config.stats_file.empty()) {
 517                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
 518                 stats_thread->run();
 519         }
 520
 521         InputStatsThread *input_stats_thread = NULL;
 522         if (!config.input_stats_file.empty()) {
 523                 vector<Input*> inputs_no_refcount;
 524                 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 525                      input_it != inputs.end(); ++input_it) {
 526                         inputs_no_refcount.push_back(input_it->second.input);
 527                 }
 528
 529                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
 530                 input_stats_thread->run();
 531         }
 532
 533         timespec server_start;
 534         int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
 535         assert(err != -1);
 536         if (state_fd != -1) {
 537                 // Measure time from we started deserializing (below) to now, when basically everything
 538                 // is up and running. This is, in other words, a conservative estimate of how long our
 539                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 540                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 541                         1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
 542                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 543         }
 544
 545         sd_notify(0, "READY=1");
 546
 547         while (!hupped) {
 548                 usleep(100000);
 549         }
 550
 551         if (stopped) {
 552                 sd_notify(0, "STOPPING=1");
 553         } else {
 554                 sd_notify(0, "RELOADING=1");
 555         }
 556
 557         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 558         err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
 559         assert(err != -1);
 560
 561         if (input_stats_thread != NULL) {
 562                 input_stats_thread->stop();
 563                 delete input_stats_thread;
 564         }
 565         if (stats_thread != NULL) {
 566                 stats_thread->stop();
 567                 delete stats_thread;
 568         }
 569         for (size_t i = 0; i < acceptors.size(); ++i) {
 570                 acceptors[i]->stop();
 571         }
 572         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 573              input_it != inputs.end();
 574              ++input_it) {
 575                 input_it->second.input->stop();
 576         }
 577         servers->stop();
 578
 579         CubemapStateProto state;
 580         if (stopped) {
 581                 log(INFO, "Shutting down.");
 582         } else {
 583                 log(INFO, "Serializing state and re-execing...");
 584                 state = collect_state(
 585                         serialize_start, acceptors, inputs, servers);
 586                 string serialized;
 587                 state.SerializeToString(&serialized);
 588                 state_fd = make_tempfile(serialized);
 589                 if (state_fd == -1) {
 590                         exit(1);
 591                 }
 592         }
 593         delete servers;
 594
 595         access_log->stop();
 596         delete access_log;
 597         shut_down_logging();
 598
 599         if (stopped) {
 600                 exit(0);
 601         }
 602
 603         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 604         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 605                 open_logs(config.log_destinations);
 606                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 607                 hupped = false;
 608                 shut_down_logging();
 609                 goto start;
 610         }
 611
 612         char buf[16];
 613         sprintf(buf, "%d", state_fd);
 614
 615         for ( ;; ) {
 616                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
 617                 open_logs(config.log_destinations);
 618                 log_perror("execlp");
 619                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 620                 shut_down_logging();
 621                 usleep(200000);
 622         }
 623 }