7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
13 #include <sys/types.h>
30 #include "serverpool.h"
38 ServerPool *servers = NULL;
39 volatile bool hupped = false;
46 // Serialize the given state to a file descriptor, and return the (still open)
48 int make_tempfile(const CubemapStateProto &state)
50 char tmpl[] = "/tmp/cubemapstate.XXXXXX";
51 int state_fd = mkstemp(tmpl);
58 state.SerializeToString(&serialized);
60 const char *ptr = serialized.data();
61 size_t to_write = serialized.size();
62 while (to_write > 0) {
63 ssize_t ret = write(state_fd, ptr, to_write);
76 CubemapStateProto collect_state(const timeval &serialize_start,
77 const vector<Acceptor *> acceptors,
78 const vector<Input *> inputs,
81 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
82 state.set_serialize_start_sec(serialize_start.tv_sec);
83 state.set_serialize_start_usec(serialize_start.tv_usec);
85 for (size_t i = 0; i < acceptors.size(); ++i) {
86 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
89 for (size_t i = 0; i < inputs.size(); ++i) {
90 state.add_inputs()->MergeFrom(inputs[i]->serialize());
96 // Read the state back from the file descriptor made by make_tempfile,
98 CubemapStateProto read_tempfile(int state_fd)
100 if (lseek(state_fd, 0, SEEK_SET) == -1) {
108 ssize_t ret = read(state_fd, buf, sizeof(buf));
118 serialized.append(string(buf, buf + ret));
121 close(state_fd); // Implicitly deletes the file.
123 CubemapStateProto state;
124 if (!state.ParseFromString(serialized)) {
125 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
132 // Find all port statements in the configuration file, and create acceptors for htem.
133 vector<Acceptor *> create_acceptors(
134 const Config &config,
135 map<int, Acceptor *> *deserialized_acceptors)
137 vector<Acceptor *> acceptors;
138 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
139 const AcceptorConfig &acceptor_config = config.acceptors[i];
140 Acceptor *acceptor = NULL;
141 map<int, Acceptor *>::iterator deserialized_acceptor_it =
142 deserialized_acceptors->find(acceptor_config.port);
143 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
144 acceptor = deserialized_acceptor_it->second;
145 deserialized_acceptors->erase(deserialized_acceptor_it);
147 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
148 acceptor = new Acceptor(server_sock, acceptor_config.port);
151 acceptors.push_back(acceptor);
154 // Close all acceptors that are no longer in the configuration file.
155 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
156 acceptor_it != deserialized_acceptors->end();
158 acceptor_it->second->close_socket();
159 delete acceptor_it->second;
165 // Find all streams in the configuration file, and create inputs for them.
166 vector<Input *> create_inputs(const Config &config,
167 map<string, Input *> *deserialized_inputs)
169 vector<Input *> inputs;
170 for (unsigned i = 0; i < config.streams.size(); ++i) {
171 const StreamConfig &stream_config = config.streams[i];
172 if (stream_config.src.empty()) {
176 string stream_id = stream_config.stream_id;
177 string src = stream_config.src;
180 map<string, Input *>::iterator deserialized_input_it =
181 deserialized_inputs->find(stream_id);
182 if (deserialized_input_it != deserialized_inputs->end()) {
183 input = deserialized_input_it->second;
184 if (input->get_url() != src) {
185 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
186 stream_id.c_str(), input->get_url().c_str(), src.c_str());
187 input->close_socket();
191 deserialized_inputs->erase(deserialized_input_it);
194 input = create_input(stream_id, src);
196 fprintf(stderr, "ERROR: did not understand URL '%s', clients will not get any data.\n",
202 inputs.push_back(input);
207 void create_streams(const Config &config,
208 const set<string> &deserialized_stream_ids,
209 map<string, Input *> *deserialized_inputs)
211 vector<MarkPool *> mark_pools; // FIXME: leak
212 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
213 const MarkPoolConfig &mp_config = config.mark_pools[i];
214 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
217 set<string> expecting_stream_ids = deserialized_stream_ids;
218 for (unsigned i = 0; i < config.streams.size(); ++i) {
219 const StreamConfig &stream_config = config.streams[i];
220 if (deserialized_stream_ids.count(stream_config.stream_id) == 0) {
221 servers->add_stream(stream_config.stream_id);
223 expecting_stream_ids.erase(stream_config.stream_id);
225 if (stream_config.mark_pool != -1) {
226 servers->set_mark_pool(stream_config.stream_id,
227 mark_pools[stream_config.mark_pool]);
231 // Warn about any servers we've lost.
232 // TODO: Make an option (delete=yes?) to actually shut down streams.
233 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
234 stream_it != expecting_stream_ids.end();
236 string stream_id = *stream_it;
237 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
239 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
240 if (deserialized_inputs->count(stream_id) != 0) {
241 delete (*deserialized_inputs)[stream_id];
242 deserialized_inputs->erase(stream_id);
247 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
249 char *argv0_copy = strdup(argv0.c_str());
250 char *config_filename_copy = strdup(config_filename.c_str());
257 free(config_filename_copy);
261 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
270 free(config_filename_copy);
275 err = waitpid(pid, &status, 0);
276 } while (err == -1 && errno == EINTR);
283 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
286 int main(int argc, char **argv)
290 bool test_config = false;
292 static const option long_options[] = {
293 { "state", required_argument, 0, 's' },
294 { "test-config", no_argument, 0, 't' },
296 int option_index = 0;
297 int c = getopt_long (argc, argv, "s:t", long_options, &option_index);
304 state_fd = atoi(optarg);
314 string config_filename = "cubemap.config";
316 config_filename = argv[optind++];
320 if (!parse_config(config_filename, &config)) {
328 fprintf(stderr, "\nCubemap " SERVER_VERSION " starting.\n");
329 servers = new ServerPool(config.num_servers);
331 CubemapStateProto loaded_state;
332 struct timeval serialize_start;
333 set<string> deserialized_stream_ids;
334 map<string, Input *> deserialized_inputs;
335 map<int, Acceptor *> deserialized_acceptors;
336 if (state_fd != -1) {
337 fprintf(stderr, "Deserializing state from previous process... ");
338 loaded_state = read_tempfile(state_fd);
340 serialize_start.tv_sec = loaded_state.serialize_start_sec();
341 serialize_start.tv_usec = loaded_state.serialize_start_usec();
343 // Deserialize the streams.
344 for (int i = 0; i < loaded_state.streams_size(); ++i) {
345 servers->add_stream_from_serialized(loaded_state.streams(i));
346 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
349 // Deserialize the inputs. Note that we don't actually add them to any state yet.
350 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
351 deserialized_inputs.insert(make_pair(
352 loaded_state.inputs(i).stream_id(),
353 create_input(loaded_state.inputs(i))));
356 // Deserialize the acceptors.
357 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
358 deserialized_acceptors.insert(make_pair(
359 loaded_state.acceptors(i).port(),
360 new Acceptor(loaded_state.acceptors(i))));
363 fprintf(stderr, "done.\n");
366 // Find all streams in the configuration file, and create them.
367 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
371 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
372 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
374 // All deserialized inputs should now have been taken care of, one way or the other.
375 assert(deserialized_inputs.empty());
377 // Put back the existing clients. It doesn't matter which server we
378 // allocate them to, so just do round-robin. However, we need to add
379 // them after the mark pools have been set up.
380 for (int i = 0; i < loaded_state.clients_size(); ++i) {
381 servers->add_client_from_serialized(loaded_state.clients(i));
384 // Start writing statistics.
385 StatsThread *stats_thread = NULL;
386 if (!config.stats_file.empty()) {
387 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
389 } else if (config.stats_interval != -1) {
390 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
395 struct timeval server_start;
396 gettimeofday(&server_start, NULL);
397 if (state_fd != -1) {
398 // Measure time from we started deserializing (below) to now, when basically everything
399 // is up and running. This is, in other words, a conservative estimate of how long our
400 // “glitch” period was, not counting of course reconnects if the configuration changed.
401 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
402 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
403 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
410 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
411 gettimeofday(&serialize_start, NULL);
413 if (stats_thread != NULL) {
414 stats_thread->stop();
416 for (size_t i = 0; i < acceptors.size(); ++i) {
417 acceptors[i]->stop();
419 for (size_t i = 0; i < inputs.size(); ++i) {
424 fprintf(stderr, "Serializing state and re-execing...\n");
425 state_fd = make_tempfile(collect_state(
426 serialize_start, acceptors, inputs, servers));
429 if (!dry_run_config(argv[0], config_filename)) {
430 fprintf(stderr, "ERROR: %s --test-config failed. Restarting old version instead of new.\n", argv[0]);
436 sprintf(buf, "%d", state_fd);
439 execlp(argv[0], argv[0], config_filename.c_str(), "--state", buf, NULL);
441 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);