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