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