6 #include <sys/socket.h>
27 #include "serverpool.h"
35 ServerPool *servers = NULL;
36 volatile bool hupped = false;
43 // Serialize the given state to a file descriptor, and return the (still open)
45 int make_tempfile(const CubemapStateProto &state)
47 char tmpl[] = "/tmp/cubemapstate.XXXXXX";
48 int state_fd = mkstemp(tmpl);
55 state.SerializeToString(&serialized);
57 const char *ptr = serialized.data();
58 size_t to_write = serialized.size();
59 while (to_write > 0) {
60 ssize_t ret = write(state_fd, ptr, to_write);
73 CubemapStateProto collect_state(const timeval &serialize_start,
74 const vector<Acceptor *> acceptors,
75 const vector<Input *> inputs,
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_usec);
82 for (size_t i = 0; i < acceptors.size(); ++i) {
83 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
86 for (size_t i = 0; i < inputs.size(); ++i) {
87 state.add_inputs()->MergeFrom(inputs[i]->serialize());
93 // Read the state back from the file descriptor made by make_tempfile,
95 CubemapStateProto read_tempfile(int state_fd)
97 if (lseek(state_fd, 0, SEEK_SET) == -1) {
105 ssize_t ret = read(state_fd, buf, sizeof(buf));
115 serialized.append(string(buf, buf + ret));
118 close(state_fd); // Implicitly deletes the file.
120 CubemapStateProto state;
121 if (!state.ParseFromString(serialized)) {
122 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
129 // Find all port statements in the configuration file, and create acceptors for htem.
130 vector<Acceptor *> create_acceptors(
131 const Config &config,
132 map<int, Acceptor *> *deserialized_acceptors)
134 vector<Acceptor *> acceptors;
135 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
136 const AcceptorConfig &acceptor_config = config.acceptors[i];
137 Acceptor *acceptor = NULL;
138 map<int, Acceptor *>::iterator deserialized_acceptor_it =
139 deserialized_acceptors->find(acceptor_config.port);
140 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
141 acceptor = deserialized_acceptor_it->second;
142 deserialized_acceptors->erase(deserialized_acceptor_it);
144 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
145 acceptor = new Acceptor(server_sock, acceptor_config.port);
148 acceptors.push_back(acceptor);
151 // Close all acceptors that are no longer in the configuration file.
152 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
153 acceptor_it != deserialized_acceptors->end();
155 acceptor_it->second->close_socket();
156 delete acceptor_it->second;
162 // Find all streams in the configuration file, and create inputs for them.
163 vector<Input *> create_inputs(const Config &config,
164 map<string, Input *> *deserialized_inputs)
166 vector<Input *> inputs;
167 for (unsigned i = 0; i < config.streams.size(); ++i) {
168 const StreamConfig &stream_config = config.streams[i];
169 if (stream_config.src.empty()) {
173 string stream_id = stream_config.stream_id;
174 string src = stream_config.src;
177 map<string, Input *>::iterator deserialized_input_it =
178 deserialized_inputs->find(stream_id);
179 if (deserialized_input_it != deserialized_inputs->end()) {
180 input = deserialized_input_it->second;
181 if (input->get_url() != src) {
182 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
183 stream_id.c_str(), input->get_url().c_str(), src.c_str());
184 input->close_socket();
188 deserialized_inputs->erase(deserialized_input_it);
191 input = create_input(stream_id, src);
193 fprintf(stderr, "ERROR: did not understand URL '%s', clients will not get any data.\n",
199 inputs.push_back(input);
204 void create_streams(const Config &config,
205 const set<string> &deserialized_stream_ids,
206 map<string, Input *> *deserialized_inputs)
208 vector<MarkPool *> mark_pools; // FIXME: leak
209 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
210 const MarkPoolConfig &mp_config = config.mark_pools[i];
211 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
214 set<string> expecting_stream_ids = deserialized_stream_ids;
215 for (unsigned i = 0; i < config.streams.size(); ++i) {
216 const StreamConfig &stream_config = config.streams[i];
217 if (deserialized_stream_ids.count(stream_config.stream_id) == 0) {
218 servers->add_stream(stream_config.stream_id);
220 expecting_stream_ids.erase(stream_config.stream_id);
222 if (stream_config.mark_pool != -1) {
223 servers->set_mark_pool(stream_config.stream_id,
224 mark_pools[stream_config.mark_pool]);
228 // Warn about any servers we've lost.
229 // TODO: Make an option (delete=yes?) to actually shut down streams.
230 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
231 stream_it != expecting_stream_ids.end();
233 string stream_id = *stream_it;
234 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
236 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
237 if (deserialized_inputs->count(stream_id) != 0) {
238 delete (*deserialized_inputs)[stream_id];
239 deserialized_inputs->erase(stream_id);
244 int main(int argc, char **argv)
246 fprintf(stderr, "\nCubemap " SERVER_VERSION " starting.\n");
248 struct timeval serialize_start;
249 bool is_reexec = false;
251 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
253 if (!parse_config(config_filename, &config)) {
257 servers = new ServerPool(config.num_servers);
259 CubemapStateProto loaded_state;
260 set<string> deserialized_stream_ids;
261 map<string, Input *> deserialized_inputs;
262 map<int, Acceptor *> deserialized_acceptors;
263 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
266 fprintf(stderr, "Deserializing state from previous process... ");
267 int state_fd = atoi(argv[3]);
268 loaded_state = read_tempfile(state_fd);
270 serialize_start.tv_sec = loaded_state.serialize_start_sec();
271 serialize_start.tv_usec = loaded_state.serialize_start_usec();
273 // Deserialize the streams.
274 for (int i = 0; i < loaded_state.streams_size(); ++i) {
275 servers->add_stream_from_serialized(loaded_state.streams(i));
276 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
279 // Deserialize the inputs. Note that we don't actually add them to any state yet.
280 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
281 deserialized_inputs.insert(make_pair(
282 loaded_state.inputs(i).stream_id(),
283 create_input(loaded_state.inputs(i))));
286 // Convert the acceptor from older serialized formats.
287 if (loaded_state.has_server_sock() && loaded_state.has_port()) {
288 AcceptorProto *acceptor = loaded_state.add_acceptors();
289 acceptor->set_server_sock(loaded_state.server_sock());
290 acceptor->set_port(loaded_state.port());
293 // Deserialize the acceptors.
294 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
295 deserialized_acceptors.insert(make_pair(
296 loaded_state.acceptors(i).port(),
297 new Acceptor(loaded_state.acceptors(i))));
300 fprintf(stderr, "done.\n");
303 // Find all streams in the configuration file, and create them.
304 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
308 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
309 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
311 // All deserialized inputs should now have been taken care of, one way or the other.
312 assert(deserialized_inputs.empty());
315 // Put back the existing clients. It doesn't matter which server we
316 // allocate them to, so just do round-robin. However, we need to add
317 // them after the mark pools have been set up.
318 for (int i = 0; i < loaded_state.clients_size(); ++i) {
319 servers->add_client_from_serialized(loaded_state.clients(i));
323 // Start writing statistics.
324 StatsThread *stats_thread = NULL;
325 if (!config.stats_file.empty()) {
326 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
328 } else if (config.stats_interval != -1) {
329 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
334 struct timeval server_start;
335 gettimeofday(&server_start, NULL);
337 // Measure time from we started deserializing (below) to now, when basically everything
338 // is up and running. This is, in other words, a conservative estimate of how long our
339 // “glitch” period was, not counting of course reconnects if the configuration changed.
340 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
341 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
342 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
349 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
350 gettimeofday(&serialize_start, NULL);
352 if (stats_thread != NULL) {
353 stats_thread->stop();
355 for (size_t i = 0; i < acceptors.size(); ++i) {
356 acceptors[i]->stop();
358 for (size_t i = 0; i < inputs.size(); ++i) {
363 fprintf(stderr, "Serializing state and re-execing...\n");
364 int state_fd = make_tempfile(collect_state(
365 serialize_start, acceptors, inputs, servers));
369 sprintf(buf, "%d", state_fd);
372 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
374 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);