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 timeval &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_usec);
  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_encoding(stream_index,
 189                                               Stream::Encoding(stream_config.encoding));
 190                 }
 191
 192                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
 193
 194                 string src = stream_config.src;
 195                 if (!src.empty()) {
 196                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 197                         if (input_it != inputs->end()) {
 198                                 input_it->second.input->add_destination(stream_index);
 199                                 ++input_it->second.refcount;
 200                         }
 201                 }
 202         }
 203
 204         // Warn about any streams servers we've lost.
 205         for (set<string>::const_iterator stream_it = expecting_urls.begin();
 206              stream_it != expecting_urls.end();
 207              ++stream_it) {
 208                 string url = *stream_it;
 209                 log(WARNING, "stream '%s' disappeared from the configuration file. "
 210                              "It will not be deleted, but clients will not get any new inputs. "
 211                              "If you really meant to delete it, set src=delete and reload.",
 212                              url.c_str());
 213         }
 214
 215         // UDP streams.
 216         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 217                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 218                 int stream_index = servers->add_udpstream(
 219                         udpstream_config.dst,
 220                         udpstream_config.pacing_rate,
 221                         udpstream_config.ttl,
 222                         udpstream_config.multicast_iface_index);
 223
 224                 string src = udpstream_config.src;
 225                 if (!src.empty()) {
 226                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 227                         assert(input_it != inputs->end());
 228                         input_it->second.input->add_destination(stream_index);
 229                         ++input_it->second.refcount;
 230                 }
 231         }
 232 }
 233
 234 void open_logs(const vector<LogConfig> &log_destinations)
 235 {
 236         for (size_t i = 0; i < log_destinations.size(); ++i) {
 237                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
 238                         add_log_destination_file(log_destinations[i].filename);
 239                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
 240                         add_log_destination_console();
 241                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
 242                         add_log_destination_syslog();
 243                 } else {
 244                         assert(false);
 245                 }
 246         }
 247         start_logging();
 248 }
 249
 250 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
 251 {
 252         char *argv0_copy = strdup(argv0.c_str());
 253         char *config_filename_copy = strdup(config_filename.c_str());
 254
 255         pid_t pid = fork();
 256         switch (pid) {
 257         case -1:
 258                 log_perror("fork()");
 259                 free(argv0_copy);
 260                 free(config_filename_copy);
 261                 return false;
 262         case 0:
 263                 // Child.
 264                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
 265                 log_perror(argv0_copy);
 266                 _exit(1);
 267         default:
 268                 // Parent.
 269                 break;
 270         }
 271
 272         free(argv0_copy);
 273         free(config_filename_copy);
 274
 275         int status;
 276         pid_t err;
 277         do {
 278                 err = waitpid(pid, &status, 0);
 279         } while (err == -1 && errno == EINTR);
 280
 281         if (err == -1) {
 282                 log_perror("waitpid()");
 283                 return false;
 284         }
 285
 286         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 287 }
 288
 289 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 290 {
 291         for (unsigned i = 0; i < config.streams.size(); ++i) {
 292                 const StreamConfig &stream_config = config.streams[i];
 293                 if (stream_config.src == "delete") {
 294                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 295                         deleted_urls->insert(stream_config.url);
 296                 }
 297         }
 298 }
 299
 300 int main(int argc, char **argv)
 301 {
 302         signal(SIGHUP, hup);
 303         signal(SIGINT, hup);
 304         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 305         signal(SIGPIPE, SIG_IGN);
 306
 307         // Parse options.
 308         int state_fd = -1;
 309         bool test_config = false;
 310         for ( ;; ) {
 311                 static const option long_options[] = {
 312                         { "state", required_argument, 0, 's' },
 313                         { "test-config", no_argument, 0, 't' },
 314                         { 0, 0, 0, 0 }
 315                 };
 316                 int option_index = 0;
 317                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 318
 319                 if (c == -1) {
 320                         break;
 321                 }
 322                 switch (c) {
 323                 case 's':
 324                         state_fd = atoi(optarg);
 325                         break;
 326                 case 't':
 327                         test_config = true;
 328                         break;
 329                 default:
 330                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 331                         exit(1);
 332                 }
 333         }
 334
 335         string config_filename = "cubemap.config";
 336         if (optind < argc) {
 337                 config_filename = argv[optind++];
 338         }
 339
 340         // Canonicalize argv[0] and config_filename.
 341         char argv0_canon[PATH_MAX];
 342         char config_filename_canon[PATH_MAX];
 343
 344         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
 345                 log_perror(argv[0]);
 346                 exit(1);
 347         }
 348         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
 349                 log_perror(config_filename.c_str());
 350                 exit(1);
 351         }
 352
 353         // Now parse the configuration file.
 354         Config config;
 355         if (!parse_config(config_filename_canon, &config)) {
 356                 exit(1);
 357         }
 358         if (test_config) {
 359                 exit(0);
 360         }
 361
 362         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 363         // but daemon() forks, which is not good in multithreaded software, so we'll
 364         // have to do it here.
 365         if (config.daemonize) {
 366                 if (daemon(0, 0) == -1) {
 367                         log_perror("daemon");
 368                         exit(1);
 369                 }
 370         }
 371
 372 start:
 373         // Open logs as soon as possible.
 374         open_logs(config.log_destinations);
 375
 376         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 377         if (config.access_log_file.empty()) {
 378                 // Create a dummy logger.
 379                 access_log = new AccessLogThread();
 380         } else {
 381                 access_log = new AccessLogThread(config.access_log_file);
 382         }
 383         access_log->run();
 384
 385         servers = new ServerPool(config.num_servers);
 386
 387         // Find all the streams that are to be deleted.
 388         set<string> deleted_urls;
 389         find_deleted_streams(config, &deleted_urls);
 390
 391         CubemapStateProto loaded_state;
 392         struct timeval serialize_start;
 393         set<string> deserialized_urls;
 394         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
 395         multimap<string, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 396         if (state_fd != -1) {
 397                 log(INFO, "Deserializing state from previous process...");
 398                 string serialized;
 399                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 400                         exit(1);
 401                 }
 402                 if (!loaded_state.ParseFromString(serialized)) {
 403                         log(ERROR, "Failed deserialization of state.");
 404                         exit(1);
 405                 }
 406
 407                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 408                 serialize_start.tv_usec = loaded_state.serialize_start_usec();
 409
 410                 // Deserialize the streams.
 411                 map<string, string> stream_headers_for_url;  // See below.
 412                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
 413                         const StreamProto &stream = loaded_state.streams(i);
 414
 415                         if (deleted_urls.count(stream.url()) != 0) {
 416                                 // Delete the stream backlogs.
 417                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 418                                         safe_close(stream.data_fds(j));
 419                                 }
 420                         } else {
 421                                 vector<int> data_fds;
 422                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 423                                         data_fds.push_back(stream.data_fds(j));
 424                                 }
 425
 426                                 servers->add_stream_from_serialized(stream, data_fds);
 427                                 deserialized_urls.insert(stream.url());
 428
 429                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 430                         }
 431                 }
 432
 433                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 434                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
 435                         InputProto serialized_input = loaded_state.inputs(i);
 436
 437                         InputWithRefcount iwr;
 438                         iwr.input = create_input(serialized_input);
 439                         iwr.refcount = 0;
 440                         inputs.insert(make_pair(serialized_input.url(), iwr));
 441                 }
 442
 443                 // Deserialize the acceptors.
 444                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
 445                         sockaddr_in6 sin6 = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
 446                         deserialized_acceptors.insert(make_pair(
 447                                 sin6,
 448                                 new Acceptor(loaded_state.acceptors(i))));
 449                 }
 450
 451                 log(INFO, "Deserialization done.");
 452         }
 453
 454         // Add any new inputs coming from the config.
 455         create_config_inputs(config, &inputs);
 456
 457         // Find all streams in the configuration file, create them, and connect to the inputs.
 458         create_streams(config, deserialized_urls, &inputs);
 459         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 460
 461         // Convert old-style timestamps to new-style timestamps for all clients;
 462         // this simplifies the sort below.
 463         {
 464                 timespec now_monotonic;
 465                 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &now_monotonic) == -1) {
 466                         log(ERROR, "clock_gettime(CLOCK_MONOTONIC_COARSE) failed.");
 467                         exit(1);
 468                 }
 469                 long delta_sec = now_monotonic.tv_sec - time(NULL);
 470
 471                 for (int i = 0; i < loaded_state.clients_size(); ++i) {
 472                         ClientProto* client = loaded_state.mutable_clients(i);
 473                         if (client->has_connect_time_old()) {
 474                                 client->set_connect_time_sec(client->connect_time_old() + delta_sec);
 475                                 client->set_connect_time_nsec(now_monotonic.tv_nsec);
 476                                 client->clear_connect_time_old();
 477                         }
 478                 }
 479         }
 480
 481         // Put back the existing clients. It doesn't matter which server we
 482         // allocate them to, so just do round-robin. However, we need to sort them
 483         // by connection time first, since add_client_serialized() expects that.
 484         sort(loaded_state.mutable_clients()->begin(),
 485              loaded_state.mutable_clients()->end(),
 486              OrderByConnectionTime());
 487         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 488                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 489                         safe_close(loaded_state.clients(i).sock());
 490                 } else {
 491                         servers->add_client_from_serialized(loaded_state.clients(i));
 492                 }
 493         }
 494
 495         servers->run();
 496
 497         // Now delete all inputs that are longer in use, and start the others.
 498         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 499              input_it != inputs.end(); ) {
 500                 if (input_it->second.refcount == 0) {
 501                         log(WARNING, "Input '%s' no longer in use, closing.",
 502                             input_it->first.c_str());
 503                         input_it->second.input->close_socket();
 504                         delete input_it->second.input;
 505                         inputs.erase(input_it++);
 506                 } else {
 507                         input_it->second.input->run();
 508                         ++input_it;
 509                 }
 510         }
 511
 512         // Start writing statistics.
 513         StatsThread *stats_thread = NULL;
 514         if (!config.stats_file.empty()) {
 515                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
 516                 stats_thread->run();
 517         }
 518
 519         InputStatsThread *input_stats_thread = NULL;
 520         if (!config.input_stats_file.empty()) {
 521                 vector<Input*> inputs_no_refcount;
 522                 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 523                      input_it != inputs.end(); ++input_it) {
 524                         inputs_no_refcount.push_back(input_it->second.input);
 525                 }
 526
 527                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
 528                 input_stats_thread->run();
 529         }
 530
 531         struct timeval server_start;
 532         gettimeofday(&server_start, NULL);
 533         if (state_fd != -1) {
 534                 // Measure time from we started deserializing (below) to now, when basically everything
 535                 // is up and running. This is, in other words, a conservative estimate of how long our
 536                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 537                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 538                         1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
 539                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 540         }
 541
 542         while (!hupped) {
 543                 usleep(100000);
 544         }
 545
 546         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 547         gettimeofday(&serialize_start, NULL);
 548
 549         if (input_stats_thread != NULL) {
 550                 input_stats_thread->stop();
 551                 delete input_stats_thread;
 552         }
 553         if (stats_thread != NULL) {
 554                 stats_thread->stop();
 555                 delete stats_thread;
 556         }
 557         for (size_t i = 0; i < acceptors.size(); ++i) {
 558                 acceptors[i]->stop();
 559         }
 560         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 561              input_it != inputs.end();
 562              ++input_it) {
 563                 input_it->second.input->stop();
 564         }
 565         servers->stop();
 566
 567         CubemapStateProto state;
 568         if (stopped) {
 569                 log(INFO, "Shutting down.");
 570         } else {
 571                 log(INFO, "Serializing state and re-execing...");
 572                 state = collect_state(
 573                         serialize_start, acceptors, inputs, servers);
 574                 string serialized;
 575                 state.SerializeToString(&serialized);
 576                 state_fd = make_tempfile(serialized);
 577                 if (state_fd == -1) {
 578                         exit(1);
 579                 }
 580         }
 581         delete servers;
 582
 583         access_log->stop();
 584         delete access_log;
 585         shut_down_logging();
 586
 587         if (stopped) {
 588                 exit(0);
 589         }
 590
 591         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 592         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 593                 open_logs(config.log_destinations);
 594                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 595                 hupped = false;
 596                 shut_down_logging();
 597                 goto start;
 598         }
 599
 600         char buf[16];
 601         sprintf(buf, "%d", state_fd);
 602
 603         for ( ;; ) {
 604                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
 605                 open_logs(config.log_destinations);
 606                 log_perror("execlp");
 607                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 608                 shut_down_logging();
 609                 usleep(200000);
 610         }
 611 }