6 #include <sys/socket.h>
26 #include "serverpool.h"
33 ServerPool *servers = NULL;
34 volatile bool hupped = false;
41 // Serialize the given state to a file descriptor, and return the (still open)
43 int make_tempfile(const CubemapStateProto &state)
45 char tmpl[] = "/tmp/cubemapstate.XXXXXX";
46 int state_fd = mkstemp(tmpl);
53 state.SerializeToString(&serialized);
55 const char *ptr = serialized.data();
56 size_t to_write = serialized.size();
57 while (to_write > 0) {
58 ssize_t ret = write(state_fd, ptr, to_write);
71 // Read the state back from the file descriptor made by make_tempfile,
73 CubemapStateProto read_tempfile(int state_fd)
75 if (lseek(state_fd, 0, SEEK_SET) == -1) {
83 ssize_t ret = read(state_fd, buf, sizeof(buf));
93 serialized.append(string(buf, buf + ret));
96 close(state_fd); // Implicitly deletes the file.
98 CubemapStateProto state;
99 if (!state.ParseFromString(serialized)) {
100 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
107 // Reuse mark pools if one already exists.
108 MarkPool *get_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, int from, int to)
110 pair<int, int> mark_range(from, to);
111 if (mark_pools->count(mark_range) != 0) {
112 return (*mark_pools)[mark_range];
115 // Check if we're overlapping some other mark pool.
116 for (map<pair<int, int>, MarkPool *>::const_iterator mp_it = mark_pools->begin();
117 mp_it != mark_pools->end();
119 int other_from = mp_it->first.first;
120 int other_to = mp_it->first.second;
121 if ((from >= other_from && from < other_to) ||
122 (to >= other_from && to < other_to)) {
123 fprintf(stderr, "WARNING: Mark pool %d-%d partially overlaps with %d-%d, you may get duplicate marks.\n",
124 from, to, other_from, other_to);
125 fprintf(stderr, " Mark pools must either be completely disjunct, or completely overlapping.\n");
129 MarkPool *mark_pool = new MarkPool(from, to);
130 mark_pools->insert(make_pair(mark_range, mark_pool));
134 MarkPool *parse_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, const string &mark_str)
136 size_t split = mark_str.find_first_of('-');
137 if (split == string::npos) {
138 fprintf(stderr, "WARNING: Invalid mark specification '%s' (expected 'X-Y'), ignoring.\n",
143 string from_str(mark_str.begin(), mark_str.begin() + split);
144 string to_str(mark_str.begin() + split + 1, mark_str.end());
145 int from = atoi(from_str.c_str());
146 int to = atoi(to_str.c_str());
148 if (from <= 0 || from >= 65536 || to <= 0 || to >= 65536) {
149 fprintf(stderr, "WARNING: Mark pool range %d-%d is outside legal range [1,65536>, ignoring.\n",
154 return get_mark_pool(mark_pools, from, to);
157 int main(int argc, char **argv)
159 fprintf(stderr, "\nCubemap starting.\n");
161 struct timeval serialize_start;
162 bool is_reexec = false;
164 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
165 vector<ConfigLine> config = parse_config(config_filename);
167 int port = fetch_config_int(config, "port", 1, 65535, PARAMATER_MANDATORY);
168 int num_servers = fetch_config_int(config, "num_servers", 1, 20000, PARAMATER_MANDATORY); // Insanely high max limit.
170 servers = new ServerPool(num_servers);
172 CubemapStateProto loaded_state;
173 int server_sock = -1, old_port = -1;
174 set<string> deserialized_stream_ids;
175 map<string, Input *> deserialized_inputs;
176 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
179 fprintf(stderr, "Deserializing state from previous process... ");
180 int state_fd = atoi(argv[3]);
181 loaded_state = read_tempfile(state_fd);
183 serialize_start.tv_sec = loaded_state.serialize_start_sec();
184 serialize_start.tv_usec = loaded_state.serialize_start_usec();
186 // Deserialize the streams.
187 for (int i = 0; i < loaded_state.streams_size(); ++i) {
188 servers->add_stream_from_serialized(loaded_state.streams(i));
189 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
192 // Deserialize the inputs. Note that we don't actually add them to any state yet.
193 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
194 deserialized_inputs.insert(make_pair(
195 loaded_state.inputs(i).stream_id(),
196 new Input(loaded_state.inputs(i))));
199 // Deserialize the server socket.
200 server_sock = loaded_state.server_sock();
201 old_port = loaded_state.port();
203 fprintf(stderr, "done.\n");
206 // Find all streams in the configuration file, and create them.
207 set<string> expecting_stream_ids = deserialized_stream_ids;
208 map<pair<int, int>, MarkPool *> mark_pools;
209 for (unsigned i = 0; i < config.size(); ++i) {
210 if (config[i].keyword != "stream") {
213 if (config[i].arguments.size() != 1) {
214 fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
217 string stream_id = config[i].arguments[0];
218 if (deserialized_stream_ids.count(stream_id) == 0) {
219 servers->add_stream(stream_id);
221 expecting_stream_ids.erase(stream_id);
223 // Set up marks, if so desired.
224 if (config[i].parameters.count("mark")) {
225 MarkPool *mark_pool = parse_mark_pool(&mark_pools, config[i].parameters["mark"]);
226 servers->set_mark_pool(stream_id, mark_pool);
230 // Warn about any servers we've lost.
231 // TODO: Make an option (delete=yes?) to actually shut down streams.
232 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
233 stream_it != expecting_stream_ids.end();
235 string stream_id = *stream_it;
236 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
238 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
239 if (deserialized_inputs.count(stream_id) != 0) {
240 delete deserialized_inputs[stream_id];
241 deserialized_inputs.erase(stream_id);
245 // Open a new server socket if we do not already have one, or if we changed ports.
246 if (server_sock != -1 && port != old_port) {
247 fprintf(stderr, "NOTE: Port changed from %d to %d; opening new socket.\n", old_port, port);
251 if (server_sock == -1) {
252 server_sock = create_server_socket(port);
255 // See if the user wants stats.
256 string stats_file = fetch_config_string(config, "stats_file", PARAMETER_OPTIONAL);
257 int stats_interval = fetch_config_int(config, "stats_interval", 1, INT_MAX, PARAMETER_OPTIONAL, -1);
258 if (stats_interval != -1 && stats_file.empty()) {
259 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
261 StatsThread *stats_thread = NULL;
262 if (!stats_file.empty()) {
263 stats_thread = new StatsThread(stats_file, stats_interval);
268 AcceptorThread acceptor_thread(server_sock);
269 acceptor_thread.run();
271 // Find all streams in the configuration file, and create inputs for them.
272 vector<Input *> inputs;
273 for (unsigned i = 0; i < config.size(); ++i) {
274 if (config[i].keyword != "stream") {
277 assert(config[i].arguments.size() == 1);
278 string stream_id = config[i].arguments[0];
280 if (config[i].parameters.count("src") == 0) {
281 fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
286 string src = config[i].parameters["src"];
288 if (deserialized_inputs.count(stream_id) != 0) {
289 input = deserialized_inputs[stream_id];
290 if (input->get_url() != src) {
291 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
292 stream_id.c_str(), input->get_url().c_str(), src.c_str());
296 deserialized_inputs.erase(stream_id);
299 input = new Input(stream_id, src);
302 inputs.push_back(input);
305 // All deserialized inputs should now have been taken care of, one way or the other.
306 assert(deserialized_inputs.empty());
309 // Put back the existing clients. It doesn't matter which server we
310 // allocate them to, so just do round-robin. However, we need to add
311 // them after the mark pools have been set up.
312 for (int i = 0; i < loaded_state.clients_size(); ++i) {
313 servers->add_client_from_serialized(loaded_state.clients(i));
317 // Start writing statistics.
318 if (stats_thread != NULL) {
324 struct timeval server_start;
325 gettimeofday(&server_start, NULL);
327 // Measure time from we started deserializing (below) to now, when basically everything
328 // is up and running. This is, in other words, a conservative estimate of how long our
329 // “glitch” period was, not counting of course reconnects if the configuration changed.
330 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
331 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
332 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
339 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
340 gettimeofday(&serialize_start, NULL);
342 if (stats_thread != NULL) {
343 stats_thread->stop();
345 acceptor_thread.stop();
347 CubemapStateProto state;
348 state.set_serialize_start_sec(serialize_start.tv_sec);
349 state.set_serialize_start_usec(serialize_start.tv_usec);
350 state.set_server_sock(server_sock);
351 state.set_port(port);
353 for (size_t i = 0; i < inputs.size(); ++i) {
355 state.add_inputs()->MergeFrom(inputs[i]->serialize());
358 for (int i = 0; i < num_servers; ++i) {
359 servers->get_server(i)->stop();
361 CubemapStateProto local_state = servers->get_server(i)->serialize();
363 // The stream state should be identical between the servers, so we only store it once.
365 state.mutable_streams()->MergeFrom(local_state.streams());
367 for (int j = 0; j < local_state.clients_size(); ++j) {
368 state.add_clients()->MergeFrom(local_state.clients(j));
373 fprintf(stderr, "Serializing state and re-execing...\n");
374 int state_fd = make_tempfile(state);
377 sprintf(buf, "%d", state_fd);
380 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
382 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);