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