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         // HTTP ping endpoints.
 236         for (unsigned i = 0; i < config.pings.size(); ++i) {
 237                 const PingConfig &ping_config = config.pings[i];
 238                 servers->add_ping(ping_config.url, ping_config.allow_origin);
 239         }
 240 }
 241
 242 void open_logs(const vector<LogConfig> &log_destinations)
 243 {
 244         for (size_t i = 0; i < log_destinations.size(); ++i) {
 245                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
 246                         add_log_destination_file(log_destinations[i].filename);
 247                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
 248                         add_log_destination_console();
 249                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
 250                         add_log_destination_syslog();
 251                 } else {
 252                         assert(false);
 253                 }
 254         }
 255         start_logging();
 256 }
 257
 258 bool dry_run_config(const string &argv0, const string &config_filename)
 259 {
 260         char *argv0_copy = strdup(argv0.c_str());
 261         char *config_filename_copy = strdup(config_filename.c_str());
 262
 263         pid_t pid = fork();
 264         switch (pid) {
 265         case -1:
 266                 log_perror("fork()");
 267                 free(argv0_copy);
 268                 free(config_filename_copy);
 269                 return false;
 270         case 0:
 271                 // Child.
 272                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
 273                 log_perror(argv0_copy);
 274                 _exit(1);
 275         default:
 276                 // Parent.
 277                 break;
 278         }
 279
 280         free(argv0_copy);
 281         free(config_filename_copy);
 282
 283         int status;
 284         pid_t err;
 285         do {
 286                 err = waitpid(pid, &status, 0);
 287         } while (err == -1 && errno == EINTR);
 288
 289         if (err == -1) {
 290                 log_perror("waitpid()");
 291                 return false;
 292         }
 293
 294         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 295 }
 296
 297 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 298 {
 299         for (unsigned i = 0; i < config.streams.size(); ++i) {
 300                 const StreamConfig &stream_config = config.streams[i];
 301                 if (stream_config.src == "delete") {
 302                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 303                         deleted_urls->insert(stream_config.url);
 304                 }
 305         }
 306 }
 307
 308 int main(int argc, char **argv)
 309 {
 310         signal(SIGHUP, hup);
 311         signal(SIGINT, hup);
 312         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 313         signal(SIGPIPE, SIG_IGN);
 314
 315         // Parse options.
 316         int state_fd = -1;
 317         bool test_config = false;
 318         for ( ;; ) {
 319                 static const option long_options[] = {
 320                         { "state", required_argument, 0, 's' },
 321                         { "test-config", no_argument, 0, 't' },
 322                         { 0, 0, 0, 0 }
 323                 };
 324                 int option_index = 0;
 325                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 326
 327                 if (c == -1) {
 328                         break;
 329                 }
 330                 switch (c) {
 331                 case 's':
 332                         state_fd = atoi(optarg);
 333                         break;
 334                 case 't':
 335                         test_config = true;
 336                         break;
 337                 default:
 338                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 339                         exit(1);
 340                 }
 341         }
 342
 343         string config_filename = "cubemap.config";
 344         if (optind < argc) {
 345                 config_filename = argv[optind++];
 346         }
 347
 348         // Canonicalize argv[0] and config_filename.
 349         char argv0_canon[PATH_MAX];
 350         char config_filename_canon[PATH_MAX];
 351
 352         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
 353                 log_perror(argv[0]);
 354                 exit(1);
 355         }
 356         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
 357                 log_perror(config_filename.c_str());
 358                 exit(1);
 359         }
 360
 361         // Now parse the configuration file.
 362         Config config;
 363         if (!parse_config(config_filename_canon, &config)) {
 364                 exit(1);
 365         }
 366         if (test_config) {
 367                 exit(0);
 368         }
 369
 370         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 371         // but daemon() forks, which is not good in multithreaded software, so we'll
 372         // have to do it here.
 373         if (config.daemonize) {
 374                 if (daemon(0, 0) == -1) {
 375                         log_perror("daemon");
 376                         exit(1);
 377                 }
 378         }
 379
 380 start:
 381         // Open logs as soon as possible.
 382         open_logs(config.log_destinations);
 383
 384         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 385         if (config.access_log_file.empty()) {
 386                 // Create a dummy logger.
 387                 access_log = new AccessLogThread();
 388         } else {
 389                 access_log = new AccessLogThread(config.access_log_file);
 390         }
 391         access_log->run();
 392
 393         servers = new ServerPool(config.num_servers);
 394
 395         // Find all the streams that are to be deleted.
 396         set<string> deleted_urls;
 397         find_deleted_streams(config, &deleted_urls);
 398
 399         CubemapStateProto loaded_state;
 400         timespec serialize_start;
 401         set<string> deserialized_urls;
 402         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
 403         multimap<string, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 404         if (state_fd != -1) {
 405                 log(INFO, "Deserializing state from previous process...");
 406                 string serialized;
 407                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 408                         exit(1);
 409                 }
 410                 if (!loaded_state.ParseFromString(serialized)) {
 411                         log(ERROR, "Failed deserialization of state.");
 412                         exit(1);
 413                 }
 414
 415                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 416                 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
 417
 418                 // Deserialize the streams.
 419                 map<string, string> stream_headers_for_url;  // See below.
 420                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
 421                         const StreamProto &stream = loaded_state.streams(i);
 422
 423                         if (deleted_urls.count(stream.url()) != 0) {
 424                                 // Delete the stream backlogs.
 425                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 426                                         safe_close(stream.data_fds(j));
 427                                 }
 428                         } else {
 429                                 vector<int> data_fds;
 430                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 431                                         data_fds.push_back(stream.data_fds(j));
 432                                 }
 433
 434                                 servers->add_stream_from_serialized(stream, data_fds);
 435                                 deserialized_urls.insert(stream.url());
 436
 437                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 438                         }
 439                 }
 440
 441                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 442                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
 443                         InputProto serialized_input = loaded_state.inputs(i);
 444
 445                         InputWithRefcount iwr;
 446                         iwr.input = create_input(serialized_input);
 447                         iwr.refcount = 0;
 448                         inputs.insert(make_pair(serialized_input.url(), iwr));
 449                 }
 450
 451                 // Deserialize the acceptors.
 452                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
 453                         sockaddr_in6 sin6 = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
 454                         deserialized_acceptors.insert(make_pair(
 455                                 sin6,
 456                                 new Acceptor(loaded_state.acceptors(i))));
 457                 }
 458
 459                 log(INFO, "Deserialization done.");
 460         }
 461
 462         // Add any new inputs coming from the config.
 463         create_config_inputs(config, &inputs);
 464
 465         // Find all streams in the configuration file, create them, and connect to the inputs.
 466         create_streams(config, deserialized_urls, &inputs);
 467         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 468
 469         // Convert old-style timestamps to new-style timestamps for all clients;
 470         // this simplifies the sort below.
 471         {
 472                 timespec now_monotonic;
 473                 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &now_monotonic) == -1) {
 474                         log(ERROR, "clock_gettime(CLOCK_MONOTONIC_COARSE) failed.");
 475                         exit(1);
 476                 }
 477                 long delta_sec = now_monotonic.tv_sec - time(NULL);
 478
 479                 for (int i = 0; i < loaded_state.clients_size(); ++i) {
 480                         ClientProto* client = loaded_state.mutable_clients(i);
 481                         if (client->has_connect_time_old()) {
 482                                 client->set_connect_time_sec(client->connect_time_old() + delta_sec);
 483                                 client->set_connect_time_nsec(now_monotonic.tv_nsec);
 484                                 client->clear_connect_time_old();
 485                         }
 486                 }
 487         }
 488
 489         // Put back the existing clients. It doesn't matter which server we
 490         // allocate them to, so just do round-robin. However, we need to sort them
 491         // by connection time first, since add_client_serialized() expects that.
 492         sort(loaded_state.mutable_clients()->begin(),
 493              loaded_state.mutable_clients()->end(),
 494              OrderByConnectionTime());
 495         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 496                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 497                         safe_close(loaded_state.clients(i).sock());
 498                 } else {
 499                         servers->add_client_from_serialized(loaded_state.clients(i));
 500                 }
 501         }
 502
 503         servers->run();
 504
 505         // Now delete all inputs that are longer in use, and start the others.
 506         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 507              input_it != inputs.end(); ) {
 508                 if (input_it->second.refcount == 0) {
 509                         log(WARNING, "Input '%s' no longer in use, closing.",
 510                             input_it->first.c_str());
 511                         input_it->second.input->close_socket();
 512                         delete input_it->second.input;
 513                         inputs.erase(input_it++);
 514                 } else {
 515                         input_it->second.input->run();
 516                         ++input_it;
 517                 }
 518         }
 519
 520         // Start writing statistics.
 521         StatsThread *stats_thread = NULL;
 522         if (!config.stats_file.empty()) {
 523                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
 524                 stats_thread->run();
 525         }
 526
 527         InputStatsThread *input_stats_thread = NULL;
 528         if (!config.input_stats_file.empty()) {
 529                 vector<Input*> inputs_no_refcount;
 530                 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 531                      input_it != inputs.end(); ++input_it) {
 532                         inputs_no_refcount.push_back(input_it->second.input);
 533                 }
 534
 535                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
 536                 input_stats_thread->run();
 537         }
 538
 539         timespec server_start;
 540         int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
 541         assert(err != -1);
 542         if (state_fd != -1) {
 543                 // Measure time from we started deserializing (below) to now, when basically everything
 544                 // is up and running. This is, in other words, a conservative estimate of how long our
 545                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 546                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 547                         1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
 548                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 549         }
 550
 551         sd_notify(0, "READY=1");
 552
 553         while (!hupped) {
 554                 usleep(100000);
 555         }
 556
 557         if (stopped) {
 558                 sd_notify(0, "STOPPING=1");
 559         } else {
 560                 sd_notify(0, "RELOADING=1");
 561         }
 562
 563         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 564         err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
 565         assert(err != -1);
 566
 567         if (input_stats_thread != NULL) {
 568                 input_stats_thread->stop();
 569                 delete input_stats_thread;
 570         }
 571         if (stats_thread != NULL) {
 572                 stats_thread->stop();
 573                 delete stats_thread;
 574         }
 575         for (size_t i = 0; i < acceptors.size(); ++i) {
 576                 acceptors[i]->stop();
 577         }
 578         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 579              input_it != inputs.end();
 580              ++input_it) {
 581                 input_it->second.input->stop();
 582         }
 583         servers->stop();
 584
 585         CubemapStateProto state;
 586         if (stopped) {
 587                 log(INFO, "Shutting down.");
 588         } else {
 589                 log(INFO, "Serializing state and re-execing...");
 590                 state = collect_state(
 591                         serialize_start, acceptors, inputs, servers);
 592                 string serialized;
 593                 state.SerializeToString(&serialized);
 594                 state_fd = make_tempfile(serialized);
 595                 if (state_fd == -1) {
 596                         exit(1);
 597                 }
 598         }
 599         delete servers;
 600
 601         access_log->stop();
 602         delete access_log;
 603         shut_down_logging();
 604
 605         if (stopped) {
 606                 exit(0);
 607         }
 608
 609         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 610         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 611                 open_logs(config.log_destinations);
 612                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 613                 hupped = false;
 614                 shut_down_logging();
 615                 goto start;
 616         }
 617
 618         char buf[16];
 619         sprintf(buf, "%d", state_fd);
 620
 621         for ( ;; ) {
 622                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
 623                 open_logs(config.log_destinations);
 624                 log_perror("execlp");
 625                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 626                 shut_down_logging();
 627                 usleep(200000);
 628         }
 629 }