Remove some code for pre-1.1.3 deserialization compatibility.
[cubemap] / 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 "acceptor.h"
22 #include "accesslog.h"
23 #include "config.h"
24 #include "input.h"
25 #include "input_stats.h"
26 #include "log.h"
27 #include "sa_compare.h"
28 #include "serverpool.h"
29 #include "state.pb.h"
30 #include "stats.h"
31 #include "stream.h"
32 #include "util.h"
33 #include "version.h"
34
35 using namespace std;
36
37 AccessLogThread *access_log = NULL;
38 ServerPool *servers = NULL;
39 volatile bool hupped = false;
40 volatile bool stopped = false;
41
42 typedef pair<string, Input::Encoding> InputKey;
43
44 namespace {
45
46 struct OrderByConnectionTime {
47         bool operator() (const ClientProto &a, const ClientProto &b) const {
48                 if (a.connect_time_sec() != b.connect_time_sec())
49                         return a.connect_time_sec() < b.connect_time_sec();
50                 return a.connect_time_nsec() < b.connect_time_nsec();
51         }
52 };
53
54 }  // namespace
55
56 struct InputWithRefcount {
57         Input *input;
58         int refcount;
59 };
60
61 void hup(int signum)
62 {
63         hupped = true;
64         if (signum == SIGINT) {
65                 stopped = true;
66         }
67 }
68
69 void do_nothing(int signum)
70 {
71 }
72
73 CubemapStateProto collect_state(const timespec &serialize_start,
74                                 const vector<Acceptor *> acceptors,
75                                 const multimap<InputKey, InputWithRefcount> inputs,
76                                 ServerPool *servers)
77 {
78         CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
79         state.set_serialize_start_sec(serialize_start.tv_sec);
80         state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
81         
82         for (size_t i = 0; i < acceptors.size(); ++i) {
83                 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
84         }
85
86         for (multimap<InputKey, InputWithRefcount>::const_iterator input_it = inputs.begin();
87              input_it != inputs.end();
88              ++input_it) {
89                 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
90         }
91
92         return state;
93 }
94
95 // Find all port statements in the configuration file, and create acceptors for htem.
96 vector<Acceptor *> create_acceptors(
97         const Config &config,
98         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> *deserialized_acceptors)
99 {
100         vector<Acceptor *> acceptors;
101         for (unsigned i = 0; i < config.acceptors.size(); ++i) {
102                 const AcceptorConfig &acceptor_config = config.acceptors[i];
103                 Acceptor *acceptor = NULL;
104                 map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator deserialized_acceptor_it =
105                         deserialized_acceptors->find(acceptor_config.addr);
106                 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
107                         acceptor = deserialized_acceptor_it->second;
108                         deserialized_acceptors->erase(deserialized_acceptor_it);
109                 } else {
110                         int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
111                         acceptor = new Acceptor(server_sock, acceptor_config.addr);
112                 }
113                 acceptor->run();
114                 acceptors.push_back(acceptor);
115         }
116
117         // Close all acceptors that are no longer in the configuration file.
118         for (map<sockaddr_in6, Acceptor *, Sockaddr6Compare>::iterator
119                  acceptor_it = deserialized_acceptors->begin();
120              acceptor_it != deserialized_acceptors->end();
121              ++acceptor_it) {
122                 acceptor_it->second->close_socket();
123                 delete acceptor_it->second;
124         }
125
126         return acceptors;
127 }
128
129 void create_config_input(const string &src, Input::Encoding encoding, multimap<InputKey, InputWithRefcount> *inputs)
130 {
131         if (src.empty()) {
132                 return;
133         }
134         InputKey key(src, encoding);
135         if (inputs->count(key) != 0) {
136                 return;
137         }
138
139         InputWithRefcount iwr;
140         iwr.input = create_input(src, encoding);
141         if (iwr.input == NULL) {
142                 log(ERROR, "did not understand URL '%s' or source encoding was invalid, clients will not get any data.",
143                         src.c_str());
144                 return;
145         }
146         iwr.refcount = 0;
147         inputs->insert(make_pair(key, iwr));
148 }
149
150 // Find all streams in the configuration file, and create inputs for them.
151 void create_config_inputs(const Config &config, multimap<InputKey, InputWithRefcount> *inputs)
152 {
153         for (unsigned i = 0; i < config.streams.size(); ++i) {
154                 const StreamConfig &stream_config = config.streams[i];
155                 if (stream_config.src != "delete") {
156                         create_config_input(stream_config.src, Input::Encoding(stream_config.src_encoding), inputs);
157                 }
158         }
159         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
160                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
161                 create_config_input(udpstream_config.src, Input::INPUT_ENCODING_RAW, inputs);
162         }
163 }
164
165 void create_streams(const Config &config,
166                     const set<string> &deserialized_urls,
167                     multimap<InputKey, InputWithRefcount> *inputs)
168 {
169         // HTTP streams.
170         set<string> expecting_urls = deserialized_urls;
171         for (unsigned i = 0; i < config.streams.size(); ++i) {
172                 const StreamConfig &stream_config = config.streams[i];
173                 int stream_index;
174
175                 expecting_urls.erase(stream_config.url);
176
177                 // Special-case deleted streams; they were never deserialized in the first place,
178                 // so just ignore them.
179                 if (stream_config.src == "delete") {
180                         continue;
181                 }
182
183                 if (deserialized_urls.count(stream_config.url) == 0) {
184                         stream_index = servers->add_stream(stream_config.url,
185                                                            stream_config.backlog_size,
186                                                            stream_config.prebuffering_bytes,
187                                                            Stream::Encoding(stream_config.encoding),
188                                                            Stream::Encoding(stream_config.src_encoding));
189                 } else {
190                         stream_index = servers->lookup_stream_by_url(stream_config.url);
191                         assert(stream_index != -1);
192                         servers->set_backlog_size(stream_index, stream_config.backlog_size);
193                         servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
194                         servers->set_encoding(stream_index,
195                                               Stream::Encoding(stream_config.encoding));
196                         servers->set_src_encoding(stream_index,
197                                                   Stream::Encoding(stream_config.src_encoding));
198                 }
199
200                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
201
202                 string src = stream_config.src;
203                 Input::Encoding src_encoding = Input::Encoding(stream_config.src_encoding);
204                 if (!src.empty()) {
205                         multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, src_encoding));
206                         if (input_it != inputs->end()) {
207                                 input_it->second.input->add_destination(stream_index);
208                                 ++input_it->second.refcount;
209                         }
210                 }
211         }
212
213         // Warn about any streams servers we've lost.
214         for (set<string>::const_iterator stream_it = expecting_urls.begin();
215              stream_it != expecting_urls.end();
216              ++stream_it) {
217                 string url = *stream_it;
218                 log(WARNING, "stream '%s' disappeared from the configuration file. "
219                              "It will not be deleted, but clients will not get any new inputs. "
220                              "If you really meant to delete it, set src=delete and reload.",
221                              url.c_str());
222         }
223
224         // UDP streams.
225         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
226                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
227                 int stream_index = servers->add_udpstream(
228                         udpstream_config.dst,
229                         udpstream_config.pacing_rate,
230                         udpstream_config.ttl,
231                         udpstream_config.multicast_iface_index);
232
233                 string src = udpstream_config.src;
234                 if (!src.empty()) {
235                         multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, Input::INPUT_ENCODING_RAW));
236                         assert(input_it != inputs->end());
237                         input_it->second.input->add_destination(stream_index);
238                         ++input_it->second.refcount;
239                 }
240         }
241
242         // HTTP gen204 endpoints.
243         for (unsigned i = 0; i < config.pings.size(); ++i) {
244                 const Gen204Config &ping_config = config.pings[i];
245                 servers->add_gen204(ping_config.url, ping_config.allow_origin);
246         }
247 }
248         
249 void open_logs(const vector<LogConfig> &log_destinations)
250 {
251         for (size_t i = 0; i < log_destinations.size(); ++i) {
252                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
253                         add_log_destination_file(log_destinations[i].filename);
254                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
255                         add_log_destination_console();
256                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
257                         add_log_destination_syslog();
258                 } else {
259                         assert(false);
260                 }
261         }
262         start_logging();
263 }
264         
265 bool dry_run_config(const string &argv0, const string &config_filename)
266 {
267         char *argv0_copy = strdup(argv0.c_str());
268         char *config_filename_copy = strdup(config_filename.c_str());
269
270         pid_t pid = fork();
271         switch (pid) {
272         case -1:
273                 log_perror("fork()");
274                 free(argv0_copy);
275                 free(config_filename_copy);
276                 return false;
277         case 0:
278                 // Child.
279                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
280                 log_perror(argv0_copy);
281                 _exit(1);
282         default:
283                 // Parent.
284                 break;
285         }
286                 
287         free(argv0_copy);
288         free(config_filename_copy);
289
290         int status;
291         pid_t err;
292         do {
293                 err = waitpid(pid, &status, 0);
294         } while (err == -1 && errno == EINTR);
295
296         if (err == -1) {
297                 log_perror("waitpid()");
298                 return false;
299         }       
300
301         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
302 }
303
304 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
305 {
306         for (unsigned i = 0; i < config.streams.size(); ++i) {
307                 const StreamConfig &stream_config = config.streams[i];
308                 if (stream_config.src == "delete") {
309                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
310                         deleted_urls->insert(stream_config.url);
311                 }
312         }
313 }
314
315 int main(int argc, char **argv)
316 {
317         signal(SIGHUP, hup);
318         signal(SIGINT, hup);
319         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
320         signal(SIGPIPE, SIG_IGN);
321         
322         // Parse options.
323         int state_fd = -1;
324         bool test_config = false;
325         for ( ;; ) {
326                 static const option long_options[] = {
327                         { "state", required_argument, 0, 's' },
328                         { "test-config", no_argument, 0, 't' },
329                         { 0, 0, 0, 0 }
330                 };
331                 int option_index = 0;
332                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
333      
334                 if (c == -1) {
335                         break;
336                 }
337                 switch (c) {
338                 case 's':
339                         state_fd = atoi(optarg);
340                         break;
341                 case 't':
342                         test_config = true;
343                         break;
344                 default:
345                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
346                         exit(1);
347                 }
348         }
349
350         string config_filename = "cubemap.config";
351         if (optind < argc) {
352                 config_filename = argv[optind++];
353         }
354
355         // Canonicalize argv[0] and config_filename.
356         char argv0_canon[PATH_MAX];
357         char config_filename_canon[PATH_MAX];
358
359         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
360                 log_perror(argv[0]);
361                 exit(1);
362         }
363         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
364                 log_perror(config_filename.c_str());
365                 exit(1);
366         }
367
368         // Now parse the configuration file.
369         Config config;
370         if (!parse_config(config_filename_canon, &config)) {
371                 exit(1);
372         }
373         if (test_config) {
374                 exit(0);
375         }
376         
377         // Ideally we'd like to daemonize only when we've started up all threads etc.,
378         // but daemon() forks, which is not good in multithreaded software, so we'll
379         // have to do it here.
380         if (config.daemonize) {
381                 if (daemon(0, 0) == -1) {
382                         log_perror("daemon");
383                         exit(1);
384                 }
385         }
386
387 start:
388         // Open logs as soon as possible.
389         open_logs(config.log_destinations);
390
391         log(INFO, "Cubemap " SERVER_VERSION " starting.");
392         if (config.access_log_file.empty()) {
393                 // Create a dummy logger.
394                 access_log = new AccessLogThread();
395         } else {
396                 access_log = new AccessLogThread(config.access_log_file);
397         }
398         access_log->run();
399
400         servers = new ServerPool(config.num_servers);
401
402         // Find all the streams that are to be deleted.
403         set<string> deleted_urls;
404         find_deleted_streams(config, &deleted_urls);
405
406         CubemapStateProto loaded_state;
407         timespec serialize_start;
408         set<string> deserialized_urls;
409         map<sockaddr_in6, Acceptor *, Sockaddr6Compare> deserialized_acceptors;
410         multimap<InputKey, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
411         if (state_fd != -1) {
412                 log(INFO, "Deserializing state from previous process...");
413                 string serialized;
414                 if (!read_tempfile_and_close(state_fd, &serialized)) {
415                         exit(1);
416                 }
417                 if (!loaded_state.ParseFromString(serialized)) {
418                         log(ERROR, "Failed deserialization of state.");
419                         exit(1);
420                 }
421
422                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
423                 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
424
425                 // Deserialize the streams.
426                 map<string, string> stream_headers_for_url;  // See below.
427                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
428                         const StreamProto &stream = loaded_state.streams(i);
429
430                         if (deleted_urls.count(stream.url()) != 0) {
431                                 // Delete the stream backlogs.
432                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
433                                         safe_close(stream.data_fds(j));
434                                 }
435                         } else {
436                                 vector<int> data_fds;
437                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
438                                         data_fds.push_back(stream.data_fds(j));
439                                 }
440
441                                 servers->add_stream_from_serialized(stream, data_fds);
442                                 deserialized_urls.insert(stream.url());
443
444                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
445                         }
446                 }
447
448                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
449                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
450                         InputProto serialized_input = loaded_state.inputs(i);
451
452                         InputWithRefcount iwr;
453                         iwr.input = create_input(serialized_input);
454                         iwr.refcount = 0;
455
456                         Input::Encoding src_encoding = serialized_input.is_metacube_encoded() ?
457                                 Input::INPUT_ENCODING_METACUBE :
458                                 Input::INPUT_ENCODING_RAW;
459                         InputKey key(serialized_input.url(), src_encoding);
460                         inputs.insert(make_pair(key, iwr));
461                 } 
462
463                 // Deserialize the acceptors.
464                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
465                         sockaddr_in6 sin6 = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
466                         deserialized_acceptors.insert(make_pair(
467                                 sin6,
468                                 new Acceptor(loaded_state.acceptors(i))));
469                 }
470
471                 log(INFO, "Deserialization done.");
472         }
473
474         // Add any new inputs coming from the config.
475         create_config_inputs(config, &inputs);
476         
477         // Find all streams in the configuration file, create them, and connect to the inputs.
478         create_streams(config, deserialized_urls, &inputs);
479         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
480         
481         // Put back the existing clients. It doesn't matter which server we
482         // allocate them to, so just do round-robin. However, we need to sort them
483         // by connection time first, since add_client_serialized() expects that.
484         sort(loaded_state.mutable_clients()->begin(),
485              loaded_state.mutable_clients()->end(),
486              OrderByConnectionTime());
487         for (int i = 0; i < loaded_state.clients_size(); ++i) {
488                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
489                         safe_close(loaded_state.clients(i).sock());
490                 } else {
491                         servers->add_client_from_serialized(loaded_state.clients(i));
492                 }
493         }
494         
495         servers->run();
496
497         // Now delete all inputs that are longer in use, and start the others.
498         for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
499              input_it != inputs.end(); ) {
500                 if (input_it->second.refcount == 0) {
501                         if (input_it->first.second == Input::INPUT_ENCODING_RAW) {
502                                 log(WARNING, "Raw input '%s' no longer in use, closing.",
503                                     input_it->first.first.c_str());
504                         } else {
505                                 assert(input_it->first.second == Input::INPUT_ENCODING_METACUBE);
506                                 log(WARNING, "Metacube input '%s' no longer in use, closing.",
507                                     input_it->first.first.c_str());
508                         }
509                         input_it->second.input->close_socket();
510                         delete input_it->second.input;
511                         inputs.erase(input_it++);
512                 } else {
513                         input_it->second.input->run();
514                         ++input_it;
515                 }
516         }
517
518         // Start writing statistics.
519         StatsThread *stats_thread = NULL;
520         if (!config.stats_file.empty()) {
521                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
522                 stats_thread->run();
523         }
524
525         InputStatsThread *input_stats_thread = NULL;
526         if (!config.input_stats_file.empty()) {
527                 vector<Input*> inputs_no_refcount;
528                 for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
529                      input_it != inputs.end(); ++input_it) {
530                         inputs_no_refcount.push_back(input_it->second.input);
531                 }
532
533                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
534                 input_stats_thread->run();
535         }
536
537         timespec server_start;
538         int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
539         assert(err != -1);
540         if (state_fd != -1) {
541                 // Measure time from we started deserializing (below) to now, when basically everything
542                 // is up and running. This is, in other words, a conservative estimate of how long our
543                 // “glitch” period was, not counting of course reconnects if the configuration changed.
544                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
545                         1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
546                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
547         }
548
549         sd_notify(0, "READY=1");
550
551         while (!hupped) {
552                 usleep(100000);
553         }
554
555         if (stopped) {
556                 sd_notify(0, "STOPPING=1");
557         } else {
558                 sd_notify(0, "RELOADING=1");
559         }
560
561         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
562         err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
563         assert(err != -1);
564
565         if (input_stats_thread != NULL) {
566                 input_stats_thread->stop();
567                 delete input_stats_thread;
568         }
569         if (stats_thread != NULL) {
570                 stats_thread->stop();
571                 delete stats_thread;
572         }
573         for (size_t i = 0; i < acceptors.size(); ++i) {
574                 acceptors[i]->stop();
575         }
576         for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
577              input_it != inputs.end();
578              ++input_it) {
579                 input_it->second.input->stop();
580         }
581         servers->stop();
582
583         CubemapStateProto state;
584         if (stopped) {
585                 log(INFO, "Shutting down.");
586         } else {
587                 log(INFO, "Serializing state and re-execing...");
588                 state = collect_state(
589                         serialize_start, acceptors, inputs, servers);
590                 string serialized;
591                 state.SerializeToString(&serialized);
592                 state_fd = make_tempfile(serialized);
593                 if (state_fd == -1) {
594                         exit(1);
595                 }
596         }
597         delete servers;
598
599         access_log->stop();
600         delete access_log;
601         shut_down_logging();
602
603         if (stopped) {
604                 exit(0);
605         }
606
607         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
608         if (!dry_run_config(argv0_canon, config_filename_canon)) {
609                 open_logs(config.log_destinations);
610                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
611                 hupped = false;
612                 shut_down_logging();
613                 goto start;
614         }
615          
616         char buf[16];
617         sprintf(buf, "%d", state_fd);
618
619         for ( ;; ) {
620                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
621                 open_logs(config.log_destinations);
622                 log_perror("execlp");
623                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
624                 shut_down_logging();
625                 usleep(200000);
626         }
627 }