7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
28 #include "serverpool.h"
36 ServerPool *servers = NULL;
37 volatile bool hupped = false;
44 // Serialize the given state to a file descriptor, and return the (still open)
46 int make_tempfile(const CubemapStateProto &state)
48 char tmpl[] = "/tmp/cubemapstate.XXXXXX";
49 int state_fd = mkstemp(tmpl);
56 state.SerializeToString(&serialized);
58 const char *ptr = serialized.data();
59 size_t to_write = serialized.size();
60 while (to_write > 0) {
61 ssize_t ret = write(state_fd, ptr, to_write);
74 CubemapStateProto collect_state(const timeval &serialize_start,
75 const vector<Acceptor *> acceptors,
76 const vector<Input *> inputs,
79 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
80 state.set_serialize_start_sec(serialize_start.tv_sec);
81 state.set_serialize_start_usec(serialize_start.tv_usec);
83 for (size_t i = 0; i < acceptors.size(); ++i) {
84 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
87 for (size_t i = 0; i < inputs.size(); ++i) {
88 state.add_inputs()->MergeFrom(inputs[i]->serialize());
94 // Read the state back from the file descriptor made by make_tempfile,
96 CubemapStateProto read_tempfile(int state_fd)
98 if (lseek(state_fd, 0, SEEK_SET) == -1) {
106 ssize_t ret = read(state_fd, buf, sizeof(buf));
116 serialized.append(string(buf, buf + ret));
119 close(state_fd); // Implicitly deletes the file.
121 CubemapStateProto state;
122 if (!state.ParseFromString(serialized)) {
123 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
130 // Find all port statements in the configuration file, and create acceptors for htem.
131 vector<Acceptor *> create_acceptors(
132 const Config &config,
133 map<int, Acceptor *> *deserialized_acceptors)
135 vector<Acceptor *> acceptors;
136 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
137 const AcceptorConfig &acceptor_config = config.acceptors[i];
138 Acceptor *acceptor = NULL;
139 map<int, Acceptor *>::iterator deserialized_acceptor_it =
140 deserialized_acceptors->find(acceptor_config.port);
141 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
142 acceptor = deserialized_acceptor_it->second;
143 deserialized_acceptors->erase(deserialized_acceptor_it);
145 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
146 acceptor = new Acceptor(server_sock, acceptor_config.port);
149 acceptors.push_back(acceptor);
152 // Close all acceptors that are no longer in the configuration file.
153 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
154 acceptor_it != deserialized_acceptors->end();
156 acceptor_it->second->close_socket();
157 delete acceptor_it->second;
163 // Find all streams in the configuration file, and create inputs for them.
164 vector<Input *> create_inputs(const Config &config,
165 map<string, Input *> *deserialized_inputs)
167 vector<Input *> inputs;
168 for (unsigned i = 0; i < config.streams.size(); ++i) {
169 const StreamConfig &stream_config = config.streams[i];
170 if (stream_config.src.empty()) {
174 string stream_id = stream_config.stream_id;
175 string src = stream_config.src;
178 map<string, Input *>::iterator deserialized_input_it =
179 deserialized_inputs->find(stream_id);
180 if (deserialized_input_it != deserialized_inputs->end()) {
181 input = deserialized_input_it->second;
182 if (input->get_url() != src) {
183 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
184 stream_id.c_str(), input->get_url().c_str(), src.c_str());
185 input->close_socket();
189 deserialized_inputs->erase(deserialized_input_it);
192 input = create_input(stream_id, src);
194 fprintf(stderr, "ERROR: did not understand URL '%s', clients will not get any data.\n",
200 inputs.push_back(input);
205 void create_streams(const Config &config,
206 const set<string> &deserialized_stream_ids,
207 map<string, Input *> *deserialized_inputs)
209 vector<MarkPool *> mark_pools; // FIXME: leak
210 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
211 const MarkPoolConfig &mp_config = config.mark_pools[i];
212 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
215 set<string> expecting_stream_ids = deserialized_stream_ids;
216 for (unsigned i = 0; i < config.streams.size(); ++i) {
217 const StreamConfig &stream_config = config.streams[i];
218 if (deserialized_stream_ids.count(stream_config.stream_id) == 0) {
219 servers->add_stream(stream_config.stream_id);
221 expecting_stream_ids.erase(stream_config.stream_id);
223 if (stream_config.mark_pool != -1) {
224 servers->set_mark_pool(stream_config.stream_id,
225 mark_pools[stream_config.mark_pool]);
229 // Warn about any servers we've lost.
230 // TODO: Make an option (delete=yes?) to actually shut down streams.
231 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
232 stream_it != expecting_stream_ids.end();
234 string stream_id = *stream_it;
235 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
237 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
238 if (deserialized_inputs->count(stream_id) != 0) {
239 delete (*deserialized_inputs)[stream_id];
240 deserialized_inputs->erase(stream_id);
245 int main(int argc, char **argv)
247 fprintf(stderr, "\nCubemap " SERVER_VERSION " starting.\n");
252 static const option long_options[] = {
253 { "state", required_argument, 0, 's' },
255 int option_index = 0;
256 int c = getopt_long (argc, argv, "s:", long_options, &option_index);
263 state_fd = atoi(optarg);
270 string config_filename = "cubemap.config";
272 config_filename = argv[optind++];
275 struct timeval serialize_start;
278 if (!parse_config(config_filename, &config)) {
282 servers = new ServerPool(config.num_servers);
284 CubemapStateProto loaded_state;
285 set<string> deserialized_stream_ids;
286 map<string, Input *> deserialized_inputs;
287 map<int, Acceptor *> deserialized_acceptors;
288 if (state_fd != -1) {
289 fprintf(stderr, "Deserializing state from previous process... ");
290 loaded_state = read_tempfile(state_fd);
292 serialize_start.tv_sec = loaded_state.serialize_start_sec();
293 serialize_start.tv_usec = loaded_state.serialize_start_usec();
295 // Deserialize the streams.
296 for (int i = 0; i < loaded_state.streams_size(); ++i) {
297 servers->add_stream_from_serialized(loaded_state.streams(i));
298 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
301 // Deserialize the inputs. Note that we don't actually add them to any state yet.
302 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
303 deserialized_inputs.insert(make_pair(
304 loaded_state.inputs(i).stream_id(),
305 create_input(loaded_state.inputs(i))));
308 // Deserialize the acceptors.
309 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
310 deserialized_acceptors.insert(make_pair(
311 loaded_state.acceptors(i).port(),
312 new Acceptor(loaded_state.acceptors(i))));
315 fprintf(stderr, "done.\n");
318 // Find all streams in the configuration file, and create them.
319 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
323 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
324 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
326 // All deserialized inputs should now have been taken care of, one way or the other.
327 assert(deserialized_inputs.empty());
329 // Put back the existing clients. It doesn't matter which server we
330 // allocate them to, so just do round-robin. However, we need to add
331 // them after the mark pools have been set up.
332 for (int i = 0; i < loaded_state.clients_size(); ++i) {
333 servers->add_client_from_serialized(loaded_state.clients(i));
336 // Start writing statistics.
337 StatsThread *stats_thread = NULL;
338 if (!config.stats_file.empty()) {
339 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
341 } else if (config.stats_interval != -1) {
342 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
347 struct timeval server_start;
348 gettimeofday(&server_start, NULL);
349 if (state_fd != -1) {
350 // Measure time from we started deserializing (below) to now, when basically everything
351 // is up and running. This is, in other words, a conservative estimate of how long our
352 // “glitch” period was, not counting of course reconnects if the configuration changed.
353 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
354 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
355 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
362 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
363 gettimeofday(&serialize_start, NULL);
365 if (stats_thread != NULL) {
366 stats_thread->stop();
368 for (size_t i = 0; i < acceptors.size(); ++i) {
369 acceptors[i]->stop();
371 for (size_t i = 0; i < inputs.size(); ++i) {
376 fprintf(stderr, "Serializing state and re-execing...\n");
377 state_fd = make_tempfile(collect_state(
378 serialize_start, acceptors, inputs, servers));
382 sprintf(buf, "%d", state_fd);
385 execlp(argv[0], argv[0], config_filename.c_str(), "--state", buf, NULL);
387 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);