git.sesse.net Git - cubemap/blob - main.cpp

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <getopt.h>
   4 #include <limits.h>
   5 #include <signal.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/time.h>
  11 #include <sys/wait.h>
  12 #include <systemd/sd-daemon.h>
  13 #include <unistd.h>
  14 #include <algorithm>
  15 #include <map>
  16 #include <set>
  17 #include <string>
  18 #include <utility>
  19 #include <vector>
  20
  21 #include "tlse.h"
  22
  23 #include "acceptor.h"
  24 #include "accesslog.h"
  25 #include "config.h"
  26 #include "input.h"
  27 #include "input_stats.h"
  28 #include "log.h"
  29 #include "sa_compare.h"
  30 #include "serverpool.h"
  31 #include "state.pb.h"
  32 #include "stats.h"
  33 #include "stream.h"
  34 #include "util.h"
  35 #include "version.h"
  36
  37 using namespace std;
  38
  39 AccessLogThread *access_log = nullptr;
  40 ServerPool *servers = nullptr;
  41 volatile bool hupped = false;
  42 volatile bool stopped = false;
  43
  44 typedef pair<string, Input::Encoding> InputKey;
  45
  46 namespace {
  47
  48 struct OrderByConnectionTime {
  49         bool operator() (const ClientProto &a, const ClientProto &b) const {
  50                 if (a.connect_time_sec() != b.connect_time_sec())
  51                         return a.connect_time_sec() < b.connect_time_sec();
  52                 return a.connect_time_nsec() < b.connect_time_nsec();
  53         }
  54 };
  55
  56 // An arbitrary ordering.
  57 struct AcceptorConfigCompare {
  58         bool operator() (const AcceptorConfig &a, const AcceptorConfig &b) const {
  59                 int cmp = a.certificate_chain.compare(b.certificate_chain);
  60                 if (cmp != 0) {
  61                         return cmp < 0;
  62                 }
  63
  64                 cmp = a.private_key.compare(b.private_key);
  65                 if (cmp != 0) {
  66                         return cmp < 0;
  67                 }
  68
  69                 return Sockaddr6Compare()(a.addr, b.addr);
  70         }
  71 };
  72
  73 }  // namespace
  74
  75 struct InputWithRefcount {
  76         Input *input;
  77         int refcount;
  78 };
  79
  80 void hup(int signum)
  81 {
  82         hupped = true;
  83         if (signum == SIGINT) {
  84                 stopped = true;
  85         }
  86 }
  87
  88 void do_nothing(int signum)
  89 {
  90 }
  91
  92 CubemapStateProto collect_state(const timespec &serialize_start,
  93                                 const vector<Acceptor *> acceptors,
  94                                 const multimap<InputKey, InputWithRefcount> inputs,
  95                                 ServerPool *servers)
  96 {
  97         CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
  98         state.set_serialize_start_sec(serialize_start.tv_sec);
  99         state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
 100
 101         for (Acceptor *acceptor : acceptors) {
 102                 state.add_acceptors()->MergeFrom(acceptor->serialize());
 103         }
 104
 105         for (const auto &key_and_input_with_refcount : inputs) {
 106                 state.add_inputs()->MergeFrom(key_and_input_with_refcount.second.input->serialize());
 107         }
 108
 109         return state;
 110 }
 111
 112 // Find all port statements in the configuration file, and create acceptors for them.
 113 vector<Acceptor *> create_acceptors(
 114         const Config &config,
 115         map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> *deserialized_acceptors)
 116 {
 117         vector<Acceptor *> acceptors;
 118         for (const AcceptorConfig &acceptor_config : config.acceptors) {
 119                 Acceptor *acceptor = nullptr;
 120                 const auto deserialized_acceptor_it = deserialized_acceptors->find(acceptor_config);
 121                 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
 122                         acceptor = deserialized_acceptor_it->second;
 123                         deserialized_acceptors->erase(deserialized_acceptor_it);
 124                 } else {
 125                         int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
 126                         acceptor = new Acceptor(server_sock, acceptor_config.addr,
 127                                                 acceptor_config.certificate_chain,
 128                                                 acceptor_config.private_key);
 129                 }
 130                 acceptor->run();
 131                 acceptors.push_back(acceptor);
 132         }
 133
 134         // Close all acceptors that are no longer in the configuration file.
 135         for (auto &config_and_acceptor : *deserialized_acceptors) {
 136                 config_and_acceptor.second->close_socket();
 137                 delete config_and_acceptor.second;
 138         }
 139
 140         return acceptors;
 141 }
 142
 143 void create_config_input(const string &src, Input::Encoding encoding, multimap<InputKey, InputWithRefcount> *inputs)
 144 {
 145         if (src.empty()) {
 146                 return;
 147         }
 148         InputKey key(src, encoding);
 149         if (inputs->count(key) != 0) {
 150                 return;
 151         }
 152
 153         InputWithRefcount iwr;
 154         iwr.input = create_input(src, encoding);
 155         if (iwr.input == nullptr) {
 156                 log(ERROR, "did not understand URL '%s' or source encoding was invalid, clients will not get any data.",
 157                         src.c_str());
 158                 return;
 159         }
 160         iwr.refcount = 0;
 161         inputs->insert(make_pair(key, iwr));
 162 }
 163
 164 // Find all streams in the configuration file, and create inputs for them.
 165 void create_config_inputs(const Config &config, multimap<InputKey, InputWithRefcount> *inputs)
 166 {
 167         for (const StreamConfig &stream_config : config.streams) {
 168                 if (stream_config.src != "delete") {
 169                         create_config_input(stream_config.src, Input::Encoding(stream_config.src_encoding), inputs);
 170                 }
 171         }
 172         for (const UDPStreamConfig &udpstream_config : config.udpstreams) {
 173                 create_config_input(udpstream_config.src, Input::INPUT_ENCODING_RAW, inputs);
 174         }
 175 }
 176
 177 void create_streams(const Config &config,
 178                     const set<string> &deserialized_urls,
 179                     multimap<InputKey, InputWithRefcount> *inputs)
 180 {
 181         // HTTP streams.
 182         set<string> expecting_urls = deserialized_urls;
 183         for (const StreamConfig &stream_config : config.streams) {
 184                 int stream_index;
 185
 186                 expecting_urls.erase(stream_config.url);
 187
 188                 // Special-case deleted streams; they were never deserialized in the first place,
 189                 // so just ignore them.
 190                 if (stream_config.src == "delete") {
 191                         continue;
 192                 }
 193
 194                 if (deserialized_urls.count(stream_config.url) == 0) {
 195                         stream_index = servers->add_stream(stream_config.url,
 196                                                            stream_config.backlog_size,
 197                                                            stream_config.prebuffering_bytes,
 198                                                            Stream::Encoding(stream_config.encoding),
 199                                                            Stream::Encoding(stream_config.src_encoding));
 200                 } else {
 201                         stream_index = servers->lookup_stream_by_url(stream_config.url);
 202                         assert(stream_index != -1);
 203                         servers->set_backlog_size(stream_index, stream_config.backlog_size);
 204                         servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
 205                         servers->set_encoding(stream_index,
 206                                               Stream::Encoding(stream_config.encoding));
 207                         servers->set_src_encoding(stream_index,
 208                                                   Stream::Encoding(stream_config.src_encoding));
 209                 }
 210
 211                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
 212
 213                 string src = stream_config.src;
 214                 Input::Encoding src_encoding = Input::Encoding(stream_config.src_encoding);
 215                 if (!src.empty()) {
 216                         const auto input_it = inputs->find(make_pair(src, src_encoding));
 217                         if (input_it != inputs->end()) {
 218                                 input_it->second.input->add_destination(stream_index);
 219                                 ++input_it->second.refcount;
 220                         }
 221                 }
 222         }
 223
 224         // Warn about any streams servers we've lost.
 225         for (const string &url : expecting_urls) {
 226                 log(WARNING, "stream '%s' disappeared from the configuration file. "
 227                              "It will not be deleted, but clients will not get any new inputs. "
 228                              "If you really meant to delete it, set src=delete and reload.",
 229                              url.c_str());
 230         }
 231
 232         // UDP streams.
 233         for (const UDPStreamConfig &udpstream_config : config.udpstreams) {
 234                 int stream_index = servers->add_udpstream(
 235                         udpstream_config.dst,
 236                         udpstream_config.pacing_rate,
 237                         udpstream_config.ttl,
 238                         udpstream_config.multicast_iface_index);
 239
 240                 string src = udpstream_config.src;
 241                 if (!src.empty()) {
 242                         auto input_it = inputs->find(make_pair(src, Input::INPUT_ENCODING_RAW));
 243                         assert(input_it != inputs->end());
 244                         input_it->second.input->add_destination(stream_index);
 245                         ++input_it->second.refcount;
 246                 }
 247         }
 248
 249         // HTTP gen204 endpoints.
 250         for (const Gen204Config &ping_config : config.pings) {
 251                 servers->add_gen204(ping_config.url, ping_config.allow_origin);
 252         }
 253 }
 254
 255 void open_logs(const vector<LogConfig> &log_destinations)
 256 {
 257         for (const LogConfig &log_destination : log_destinations) {
 258                 if (log_destination.type == LogConfig::LOG_TYPE_FILE) {
 259                         add_log_destination_file(log_destination.filename);
 260                 } else if (log_destination.type == LogConfig::LOG_TYPE_CONSOLE) {
 261                         add_log_destination_console();
 262                 } else if (log_destination.type == LogConfig::LOG_TYPE_SYSLOG) {
 263                         add_log_destination_syslog();
 264                 } else {
 265                         assert(false);
 266                 }
 267         }
 268         start_logging();
 269 }
 270
 271 bool dry_run_config(const string &argv0, const string &config_filename)
 272 {
 273         char *argv0_copy = strdup(argv0.c_str());
 274         char *config_filename_copy = strdup(config_filename.c_str());
 275
 276         pid_t pid = fork();
 277         switch (pid) {
 278         case -1:
 279                 log_perror("fork()");
 280                 free(argv0_copy);
 281                 free(config_filename_copy);
 282                 return false;
 283         case 0:
 284                 // Child.
 285                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, nullptr);
 286                 log_perror(argv0_copy);
 287                 _exit(1);
 288         default:
 289                 // Parent.
 290                 break;
 291         }
 292
 293         free(argv0_copy);
 294         free(config_filename_copy);
 295
 296         int status;
 297         pid_t err;
 298         do {
 299                 err = waitpid(pid, &status, 0);
 300         } while (err == -1 && errno == EINTR);
 301
 302         if (err == -1) {
 303                 log_perror("waitpid()");
 304                 return false;
 305         }
 306
 307         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 308 }
 309
 310 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 311 {
 312         for (const StreamConfig &stream_config : config.streams) {
 313                 if (stream_config.src == "delete") {
 314                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 315                         deleted_urls->insert(stream_config.url);
 316                 }
 317         }
 318 }
 319
 320 int main(int argc, char **argv)
 321 {
 322         signal(SIGHUP, hup);
 323         signal(SIGINT, hup);
 324         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 325         signal(SIGPIPE, SIG_IGN);
 326
 327         tls_init();
 328
 329         // Parse options.
 330         int state_fd = -1;
 331         bool test_config = false;
 332         for ( ;; ) {
 333                 static const option long_options[] = {
 334                         { "state", required_argument, 0, 's' },
 335                         { "test-config", no_argument, 0, 't' },
 336                         { 0, 0, 0, 0 }
 337                 };
 338                 int option_index = 0;
 339                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 340
 341                 if (c == -1) {
 342                         break;
 343                 }
 344                 switch (c) {
 345                 case 's':
 346                         state_fd = atoi(optarg);
 347                         break;
 348                 case 't':
 349                         test_config = true;
 350                         break;
 351                 default:
 352                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 353                         exit(1);
 354                 }
 355         }
 356
 357         string config_filename = "cubemap.config";
 358         if (optind < argc) {
 359                 config_filename = argv[optind++];
 360         }
 361
 362         // Canonicalize argv[0] and config_filename.
 363         char argv0_canon[PATH_MAX];
 364         char config_filename_canon[PATH_MAX];
 365
 366         if (realpath("/proc/self/exe", argv0_canon) == nullptr) {
 367                 log_perror(argv[0]);
 368                 exit(1);
 369         }
 370         if (realpath(config_filename.c_str(), config_filename_canon) == nullptr) {
 371                 log_perror(config_filename.c_str());
 372                 exit(1);
 373         }
 374
 375         // Now parse the configuration file.
 376         Config config;
 377         if (!parse_config(config_filename_canon, &config)) {
 378                 exit(1);
 379         }
 380         if (test_config) {
 381                 exit(0);
 382         }
 383
 384         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 385         // but daemon() forks, which is not good in multithreaded software, so we'll
 386         // have to do it here.
 387         if (config.daemonize) {
 388                 if (daemon(0, 0) == -1) {
 389                         log_perror("daemon");
 390                         exit(1);
 391                 }
 392         }
 393
 394 start:
 395         // Open logs as soon as possible.
 396         open_logs(config.log_destinations);
 397
 398         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 399         if (config.access_log_file.empty()) {
 400                 // Create a dummy logger.
 401                 access_log = new AccessLogThread();
 402         } else {
 403                 access_log = new AccessLogThread(config.access_log_file);
 404         }
 405         access_log->run();
 406
 407         servers = new ServerPool(config.num_servers);
 408
 409         // Find all the streams that are to be deleted.
 410         set<string> deleted_urls;
 411         find_deleted_streams(config, &deleted_urls);
 412
 413         CubemapStateProto loaded_state;
 414         timespec serialize_start;
 415         set<string> deserialized_urls;
 416         map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> deserialized_acceptors;
 417         multimap<InputKey, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 418         if (state_fd != -1) {
 419                 log(INFO, "Deserializing state from previous process...");
 420                 string serialized;
 421                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 422                         exit(1);
 423                 }
 424                 if (!loaded_state.ParseFromString(serialized)) {
 425                         log(ERROR, "Failed deserialization of state.");
 426                         exit(1);
 427                 }
 428
 429                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 430                 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
 431
 432                 // Deserialize the streams.
 433                 map<string, string> stream_headers_for_url;  // See below.
 434                 for (const StreamProto &stream : loaded_state.streams()) {
 435                         if (deleted_urls.count(stream.url()) != 0) {
 436                                 // Delete the stream backlogs.
 437                                 for (const int fd : stream.data_fds()) {
 438                                         safe_close(fd);
 439                                 }
 440                         } else {
 441                                 vector<int> data_fds;
 442                                 for (const int fd : stream.data_fds()) {
 443                                         data_fds.push_back(fd);
 444                                 }
 445
 446                                 servers->add_stream_from_serialized(stream, data_fds);
 447                                 deserialized_urls.insert(stream.url());
 448
 449                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 450                         }
 451                 }
 452
 453                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 454                 for (const InputProto &serialized_input : loaded_state.inputs()) {
 455                         InputWithRefcount iwr;
 456                         iwr.input = create_input(serialized_input);
 457                         iwr.refcount = 0;
 458
 459                         Input::Encoding src_encoding = serialized_input.is_metacube_encoded() ?
 460                                 Input::INPUT_ENCODING_METACUBE :
 461                                 Input::INPUT_ENCODING_RAW;
 462                         InputKey key(serialized_input.url(), src_encoding);
 463                         inputs.insert(make_pair(key, iwr));
 464                 }
 465
 466                 // Deserialize the acceptors.
 467                 for (const AcceptorProto &serialized_acceptor : loaded_state.acceptors()) {
 468                         AcceptorConfig config;
 469                         config.addr = extract_address_from_acceptor_proto(serialized_acceptor);
 470                         config.certificate_chain = serialized_acceptor.certificate_chain();
 471                         config.private_key = serialized_acceptor.private_key();
 472                         deserialized_acceptors.insert(make_pair(
 473                                 config,
 474                                 new Acceptor(serialized_acceptor)));
 475                 }
 476
 477                 log(INFO, "Deserialization done.");
 478         }
 479
 480         // Add any new inputs coming from the config.
 481         create_config_inputs(config, &inputs);
 482
 483         // Find all streams in the configuration file, create them, and connect to the inputs.
 484         create_streams(config, deserialized_urls, &inputs);
 485         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 486
 487         // Make all the servers create TLS contexts for every TLS keypair we have.
 488         for (Acceptor *acceptor : acceptors) {
 489                 if (acceptor->is_tls()) {
 490                         servers->create_tls_context_for_acceptor(acceptor);
 491                 }
 492         }
 493
 494         // Put back the existing clients. It doesn't matter which server we
 495         // allocate them to, so just do round-robin. However, we need to sort them
 496         // by connection time first, since add_client_serialized() expects that.
 497         sort(loaded_state.mutable_clients()->begin(),
 498              loaded_state.mutable_clients()->end(),
 499              OrderByConnectionTime());
 500         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 501                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 502                         safe_close(loaded_state.clients(i).sock());
 503                 } else {
 504                         servers->add_client_from_serialized(loaded_state.clients(i));
 505                 }
 506         }
 507
 508         servers->run();
 509
 510         // Now delete all inputs that are longer in use, and start the others.
 511         for (auto input_it = inputs.begin(); input_it != inputs.end(); ) {
 512                 if (input_it->second.refcount == 0) {
 513                         if (input_it->first.second == Input::INPUT_ENCODING_RAW) {
 514                                 log(WARNING, "Raw input '%s' no longer in use, closing.",
 515                                     input_it->first.first.c_str());
 516                         } else {
 517                                 assert(input_it->first.second == Input::INPUT_ENCODING_METACUBE);
 518                                 log(WARNING, "Metacube input '%s' no longer in use, closing.",
 519                                     input_it->first.first.c_str());
 520                         }
 521                         input_it->second.input->close_socket();
 522                         delete input_it->second.input;
 523                         inputs.erase(input_it++);
 524                 } else {
 525                         input_it->second.input->run();
 526                         ++input_it;
 527                 }
 528         }
 529
 530         // Start writing statistics.
 531         unique_ptr<StatsThread> stats_thread;
 532         if (!config.stats_file.empty()) {
 533                 stats_thread.reset(new StatsThread(config.stats_file, config.stats_interval));
 534                 stats_thread->run();
 535         }
 536
 537         unique_ptr<InputStatsThread> input_stats_thread;
 538         if (!config.input_stats_file.empty()) {
 539                 vector<Input*> inputs_no_refcount;
 540                 for (const auto &key_and_input_with_refcount : inputs) {
 541                         inputs_no_refcount.push_back(key_and_input_with_refcount.second.input);
 542                 }
 543
 544                 input_stats_thread.reset(new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount));
 545                 input_stats_thread->run();
 546         }
 547
 548         timespec server_start;
 549         int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
 550         assert(err != -1);
 551         if (state_fd != -1) {
 552                 // Measure time from we started deserializing (below) to now, when basically everything
 553                 // is up and running. This is, in other words, a conservative estimate of how long our
 554                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 555                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 556                         1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
 557                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 558         }
 559
 560         sd_notify(0, "READY=1");
 561
 562         while (!hupped) {
 563                 usleep(100000);
 564         }
 565
 566         if (stopped) {
 567                 sd_notify(0, "STOPPING=1");
 568         } else {
 569                 sd_notify(0, "RELOADING=1");
 570         }
 571
 572         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 573         err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
 574         assert(err != -1);
 575
 576         if (input_stats_thread != nullptr) {
 577                 input_stats_thread->stop();
 578                 input_stats_thread.reset();
 579         }
 580         if (stats_thread != nullptr) {
 581                 stats_thread->stop();
 582                 stats_thread.reset();
 583         }
 584         for (Acceptor *acceptor : acceptors) {
 585                 acceptor->stop();
 586         }
 587         for (const auto &key_and_input_with_refcount : inputs) {
 588                 key_and_input_with_refcount.second.input->stop();
 589         }
 590         servers->stop();
 591
 592         CubemapStateProto state;
 593         if (stopped) {
 594                 log(INFO, "Shutting down.");
 595         } else {
 596                 log(INFO, "Serializing state and re-execing...");
 597                 state = collect_state(
 598                         serialize_start, acceptors, inputs, servers);
 599                 string serialized;
 600                 state.SerializeToString(&serialized);
 601                 state_fd = make_tempfile(serialized);
 602                 if (state_fd == -1) {
 603                         exit(1);
 604                 }
 605         }
 606         delete servers;
 607
 608         access_log->stop();
 609         delete access_log;
 610         shut_down_logging();
 611
 612         if (stopped) {
 613                 exit(0);
 614         }
 615
 616         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 617         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 618                 open_logs(config.log_destinations);
 619                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 620                 hupped = false;
 621                 shut_down_logging();
 622                 goto start;
 623         }
 624
 625         char buf[16];
 626         sprintf(buf, "%d", state_fd);
 627
 628         for ( ;; ) {
 629                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, nullptr);
 630                 open_logs(config.log_destinations);
 631                 log_perror("execlp");
 632                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 633                 shut_down_logging();
 634                 usleep(200000);
 635         }
 636 }