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 "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 vector<MarkPool *> mark_pools;
  39 volatile bool hupped = false;
  40 volatile bool stopped = false;
  41
  42 struct InputWithRefcount {
  43         Input *input;
  44         int refcount;
  45 };
  46
  47 void hup(int signum)
  48 {
  49         hupped = true;
  50         if (signum == SIGINT) {
  51                 stopped = true;
  52         }
  53 }
  54
  55 void do_nothing(int signum)
  56 {
  57 }
  58
  59 CubemapStateProto collect_state(const timeval &serialize_start,
  60                                 const vector<Acceptor *> acceptors,
  61                                 const multimap<string, InputWithRefcount> inputs,
  62                                 ServerPool *servers)
  63 {
  64         CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
  65         state.set_serialize_start_sec(serialize_start.tv_sec);
  66         state.set_serialize_start_usec(serialize_start.tv_usec);
  67
  68         for (size_t i = 0; i < acceptors.size(); ++i) {
  69                 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
  70         }
  71
  72         for (multimap<string, InputWithRefcount>::const_iterator input_it = inputs.begin();
  73              input_it != inputs.end();
  74              ++input_it) {
  75                 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
  76         }
  77
  78         return state;
  79 }
  80
  81 // Find all port statements in the configuration file, and create acceptors for htem.
  82 vector<Acceptor *> create_acceptors(
  83         const Config &config,
  84         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> *deserialized_acceptors)
  85 {
  86         vector<Acceptor *> acceptors;
  87         for (unsigned i = 0; i < config.acceptors.size(); ++i) {
  88                 const AcceptorConfig &acceptor_config = config.acceptors[i];
  89                 Acceptor *acceptor = NULL;
  90                 map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator deserialized_acceptor_it =
  91                         deserialized_acceptors->find(acceptor_config.addr);
  92                 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
  93                         acceptor = deserialized_acceptor_it->second;
  94                         deserialized_acceptors->erase(deserialized_acceptor_it);
  95                 } else {
  96                         int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
  97                         acceptor = new Acceptor(server_sock, acceptor_config.addr);
  98                 }
  99                 acceptor->run();
 100                 acceptors.push_back(acceptor);
 101         }
 102
 103         // Close all acceptors that are no longer in the configuration file.
 104         for (map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator
 105                  acceptor_it = deserialized_acceptors->begin();
 106              acceptor_it != deserialized_acceptors->end();
 107              ++acceptor_it) {
 108                 acceptor_it->second->close_socket();
 109                 delete acceptor_it->second;
 110         }
 111
 112         return acceptors;
 113 }
 114
 115 void create_config_input(const string &src, multimap<string, InputWithRefcount> *inputs)
 116 {
 117         if (src.empty()) {
 118                 return;
 119         }
 120         if (inputs->count(src) != 0) {
 121                 return;
 122         }
 123
 124         InputWithRefcount iwr;
 125         iwr.input = create_input(src);
 126         if (iwr.input == NULL) {
 127                 log(ERROR, "did not understand URL '%s', clients will not get any data.",
 128                         src.c_str());
 129                 return;
 130         }
 131         iwr.refcount = 0;
 132         inputs->insert(make_pair(src, iwr));
 133 }
 134
 135 // Find all streams in the configuration file, and create inputs for them.
 136 void create_config_inputs(const Config &config, multimap<string, InputWithRefcount> *inputs)
 137 {
 138         for (unsigned i = 0; i < config.streams.size(); ++i) {
 139                 const StreamConfig &stream_config = config.streams[i];
 140                 if (stream_config.src != "delete") {
 141                         create_config_input(stream_config.src, inputs);
 142                 }
 143         }
 144         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 145                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 146                 create_config_input(udpstream_config.src, inputs);
 147         }
 148 }
 149
 150 void create_streams(const Config &config,
 151                     const set<string> &deserialized_urls,
 152                     multimap<string, InputWithRefcount> *inputs)
 153 {
 154         for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
 155                 const MarkPoolConfig &mp_config = config.mark_pools[i];
 156                 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
 157         }
 158
 159         // HTTP streams.
 160         set<string> expecting_urls = deserialized_urls;
 161         for (unsigned i = 0; i < config.streams.size(); ++i) {
 162                 const StreamConfig &stream_config = config.streams[i];
 163                 int stream_index;
 164
 165                 expecting_urls.erase(stream_config.url);
 166
 167                 // Special-case deleted streams; they were never deserialized in the first place,
 168                 // so just ignore them.
 169                 if (stream_config.src == "delete") {
 170                         continue;
 171                 }
 172
 173                 if (deserialized_urls.count(stream_config.url) == 0) {
 174                         stream_index = servers->add_stream(stream_config.url,
 175                                                            stream_config.backlog_size,
 176                                                            Stream::Encoding(stream_config.encoding));
 177                 } else {
 178                         stream_index = servers->lookup_stream_by_url(stream_config.url);
 179                         assert(stream_index != -1);
 180                         servers->set_backlog_size(stream_index, stream_config.backlog_size);
 181                         servers->set_encoding(stream_index,
 182                                               Stream::Encoding(stream_config.encoding));
 183                 }
 184
 185                 if (stream_config.mark_pool != -1) {
 186                         servers->set_mark_pool(stream_index, mark_pools[stream_config.mark_pool]);
 187                 }
 188
 189                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
 190
 191                 string src = stream_config.src;
 192                 if (!src.empty()) {
 193                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 194                         if (input_it != inputs->end()) {
 195                                 input_it->second.input->add_destination(stream_index);
 196                                 ++input_it->second.refcount;
 197                         }
 198                 }
 199         }
 200
 201         // Warn about any streams servers we've lost.
 202         for (set<string>::const_iterator stream_it = expecting_urls.begin();
 203              stream_it != expecting_urls.end();
 204              ++stream_it) {
 205                 string url = *stream_it;
 206                 log(WARNING, "stream '%s' disappeared from the configuration file. "
 207                              "It will not be deleted, but clients will not get any new inputs. "
 208                              "If you really meant to delete it, set src=delete and reload.",
 209                              url.c_str());
 210         }
 211
 212         // UDP streams.
 213         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 214                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 215                 MarkPool *mark_pool = NULL;
 216                 if (udpstream_config.mark_pool != -1) {
 217                         mark_pool = mark_pools[udpstream_config.mark_pool];
 218                 }
 219                 int stream_index = servers->add_udpstream(udpstream_config.dst, mark_pool, udpstream_config.pacing_rate);
 220
 221                 string src = udpstream_config.src;
 222                 if (!src.empty()) {
 223                         multimap<string, InputWithRefcount>::iterator input_it = inputs->find(src);
 224                         assert(input_it != inputs->end());
 225                         input_it->second.input->add_destination(stream_index);
 226                         ++input_it->second.refcount;
 227                 }
 228         }
 229 }
 230
 231 void open_logs(const vector<LogConfig> &log_destinations)
 232 {
 233         for (size_t i = 0; i < log_destinations.size(); ++i) {
 234                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
 235                         add_log_destination_file(log_destinations[i].filename);
 236                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
 237                         add_log_destination_console();
 238                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
 239                         add_log_destination_syslog();
 240                 } else {
 241                         assert(false);
 242                 }
 243         }
 244         start_logging();
 245 }
 246
 247 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
 248 {
 249         char *argv0_copy = strdup(argv0.c_str());
 250         char *config_filename_copy = strdup(config_filename.c_str());
 251
 252         pid_t pid = fork();
 253         switch (pid) {
 254         case -1:
 255                 log_perror("fork()");
 256                 free(argv0_copy);
 257                 free(config_filename_copy);
 258                 return false;
 259         case 0:
 260                 // Child.
 261                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
 262                 log_perror(argv0_copy);
 263                 _exit(1);
 264         default:
 265                 // Parent.
 266                 break;
 267         }
 268
 269         free(argv0_copy);
 270         free(config_filename_copy);
 271
 272         int status;
 273         pid_t err;
 274         do {
 275                 err = waitpid(pid, &status, 0);
 276         } while (err == -1 && errno == EINTR);
 277
 278         if (err == -1) {
 279                 log_perror("waitpid()");
 280                 return false;
 281         }
 282
 283         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 284 }
 285
 286 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 287 {
 288         for (unsigned i = 0; i < config.streams.size(); ++i) {
 289                 const StreamConfig &stream_config = config.streams[i];
 290                 if (stream_config.src == "delete") {
 291                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 292                         deleted_urls->insert(stream_config.url);
 293                 }
 294         }
 295 }
 296
 297 int main(int argc, char **argv)
 298 {
 299         signal(SIGHUP, hup);
 300         signal(SIGINT, hup);
 301         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 302         signal(SIGPIPE, SIG_IGN);
 303
 304         // Parse options.
 305         int state_fd = -1;
 306         bool test_config = false;
 307         for ( ;; ) {
 308                 static const option long_options[] = {
 309                         { "state", required_argument, 0, 's' },
 310                         { "test-config", no_argument, 0, 't' },
 311                         { 0, 0, 0, 0 }
 312                 };
 313                 int option_index = 0;
 314                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 315
 316                 if (c == -1) {
 317                         break;
 318                 }
 319                 switch (c) {
 320                 case 's':
 321                         state_fd = atoi(optarg);
 322                         break;
 323                 case 't':
 324                         test_config = true;
 325                         break;
 326                 default:
 327                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 328                         exit(1);
 329                 }
 330         }
 331
 332         string config_filename = "cubemap.config";
 333         if (optind < argc) {
 334                 config_filename = argv[optind++];
 335         }
 336
 337         // Canonicalize argv[0] and config_filename.
 338         char argv0_canon[PATH_MAX];
 339         char config_filename_canon[PATH_MAX];
 340
 341         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
 342                 log_perror(argv[0]);
 343                 exit(1);
 344         }
 345         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
 346                 log_perror(config_filename.c_str());
 347                 exit(1);
 348         }
 349
 350         // Now parse the configuration file.
 351         Config config;
 352         if (!parse_config(config_filename_canon, &config)) {
 353                 exit(1);
 354         }
 355         if (test_config) {
 356                 exit(0);
 357         }
 358
 359         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 360         // but daemon() forks, which is not good in multithreaded software, so we'll
 361         // have to do it here.
 362         if (config.daemonize) {
 363                 if (daemon(0, 0) == -1) {
 364                         log_perror("daemon");
 365                         exit(1);
 366                 }
 367         }
 368
 369 start:
 370         // Open logs as soon as possible.
 371         open_logs(config.log_destinations);
 372
 373         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 374         if (config.access_log_file.empty()) {
 375                 // Create a dummy logger.
 376                 access_log = new AccessLogThread();
 377         } else {
 378                 access_log = new AccessLogThread(config.access_log_file);
 379         }
 380         access_log->run();
 381
 382         servers = new ServerPool(config.num_servers);
 383
 384         // Find all the streams that are to be deleted.
 385         set<string> deleted_urls;
 386         find_deleted_streams(config, &deleted_urls);
 387
 388         CubemapStateProto loaded_state;
 389         struct timeval serialize_start;
 390         set<string> deserialized_urls;
 391         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
 392         multimap<string, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 393         if (state_fd != -1) {
 394                 log(INFO, "Deserializing state from previous process...");
 395                 string serialized;
 396                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 397                         exit(1);
 398                 }
 399                 if (!loaded_state.ParseFromString(serialized)) {
 400                         log(ERROR, "Failed deserialization of state.");
 401                         exit(1);
 402                 }
 403
 404                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 405                 serialize_start.tv_usec = loaded_state.serialize_start_usec();
 406
 407                 // Deserialize the streams.
 408                 map<string, string> stream_headers_for_url;  // See below.
 409                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
 410                         const StreamProto &stream = loaded_state.streams(i);
 411
 412                         if (deleted_urls.count(stream.url()) != 0) {
 413                                 // Delete the stream backlogs.
 414                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 415                                         safe_close(stream.data_fds(j));
 416                                 }
 417                         } else {
 418                                 vector<int> data_fds;
 419                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 420                                         data_fds.push_back(stream.data_fds(j));
 421                                 }
 422
 423                                 servers->add_stream_from_serialized(stream, data_fds);
 424                                 deserialized_urls.insert(stream.url());
 425
 426                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 427                         }
 428                 }
 429
 430                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 431                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
 432                         InputProto serialized_input = loaded_state.inputs(i);
 433
 434                         InputWithRefcount iwr;
 435                         iwr.input = create_input(serialized_input);
 436                         iwr.refcount = 0;
 437                         inputs.insert(make_pair(serialized_input.url(), iwr));
 438                 }
 439
 440                 // Deserialize the acceptors.
 441                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
 442                         sockaddr_in6 sin6 = ExtractAddressFromAcceptorProto(loaded_state.acceptors(i));
 443                         deserialized_acceptors.insert(make_pair(
 444                                 sin6,
 445                                 new Acceptor(loaded_state.acceptors(i))));
 446                 }
 447
 448                 log(INFO, "Deserialization done.");
 449         }
 450
 451         // Add any new inputs coming from the config.
 452         create_config_inputs(config, &inputs);
 453
 454         // Find all streams in the configuration file, create them, and connect to the inputs.
 455         create_streams(config, deserialized_urls, &inputs);
 456         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 457
 458         // Put back the existing clients. It doesn't matter which server we
 459         // allocate them to, so just do round-robin. However, we need to add
 460         // them after the mark pools have been set up.
 461         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 462                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 463                         safe_close(loaded_state.clients(i).sock());
 464                 } else {
 465                         servers->add_client_from_serialized(loaded_state.clients(i));
 466                 }
 467         }
 468
 469         servers->run();
 470
 471         // Now delete all inputs that are longer in use, and start the others.
 472         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 473              input_it != inputs.end(); ) {
 474                 if (input_it->second.refcount == 0) {
 475                         log(WARNING, "Input '%s' no longer in use, closing.",
 476                             input_it->first.c_str());
 477                         input_it->second.input->close_socket();
 478                         delete input_it->second.input;
 479                         inputs.erase(input_it++);
 480                 } else {
 481                         input_it->second.input->run();
 482                         ++input_it;
 483                 }
 484         }
 485
 486         // Start writing statistics.
 487         StatsThread *stats_thread = NULL;
 488         if (!config.stats_file.empty()) {
 489                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
 490                 stats_thread->run();
 491         }
 492
 493         InputStatsThread *input_stats_thread = NULL;
 494         if (!config.input_stats_file.empty()) {
 495                 vector<Input*> inputs_no_refcount;
 496                 for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 497                      input_it != inputs.end(); ++input_it) {
 498                         inputs_no_refcount.push_back(input_it->second.input);
 499                 }
 500
 501                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
 502                 input_stats_thread->run();
 503         }
 504
 505         struct timeval server_start;
 506         gettimeofday(&server_start, NULL);
 507         if (state_fd != -1) {
 508                 // Measure time from we started deserializing (below) to now, when basically everything
 509                 // is up and running. This is, in other words, a conservative estimate of how long our
 510                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 511                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 512                         1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
 513                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 514         }
 515
 516         while (!hupped) {
 517                 usleep(100000);
 518         }
 519
 520         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 521         gettimeofday(&serialize_start, NULL);
 522
 523         if (input_stats_thread != NULL) {
 524                 input_stats_thread->stop();
 525                 delete input_stats_thread;
 526         }
 527         if (stats_thread != NULL) {
 528                 stats_thread->stop();
 529                 delete stats_thread;
 530         }
 531         for (size_t i = 0; i < acceptors.size(); ++i) {
 532                 acceptors[i]->stop();
 533         }
 534         for (multimap<string, InputWithRefcount>::iterator input_it = inputs.begin();
 535              input_it != inputs.end();
 536              ++input_it) {
 537                 input_it->second.input->stop();
 538         }
 539         servers->stop();
 540
 541         CubemapStateProto state;
 542         if (stopped) {
 543                 log(INFO, "Shutting down.");
 544         } else {
 545                 log(INFO, "Serializing state and re-execing...");
 546                 state = collect_state(
 547                         serialize_start, acceptors, inputs, servers);
 548                 string serialized;
 549                 state.SerializeToString(&serialized);
 550                 state_fd = make_tempfile(serialized);
 551                 if (state_fd == -1) {
 552                         exit(1);
 553                 }
 554         }
 555         delete servers;
 556
 557         for (unsigned i = 0; i < mark_pools.size(); ++i) {
 558                 delete mark_pools[i];
 559         }
 560         mark_pools.clear();
 561
 562         access_log->stop();
 563         delete access_log;
 564         shut_down_logging();
 565
 566         if (stopped) {
 567                 exit(0);
 568         }
 569
 570         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 571         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 572                 open_logs(config.log_destinations);
 573                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 574                 hupped = false;
 575                 shut_down_logging();
 576                 goto start;
 577         }
 578
 579         char buf[16];
 580         sprintf(buf, "%d", state_fd);
 581
 582         for ( ;; ) {
 583                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
 584                 open_logs(config.log_destinations);
 585                 log_perror("execlp");
 586                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 587                 shut_down_logging();
 588                 usleep(200000);
 589         }
 590 }