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 // Find all streams in the configuration file, and create inputs for them.
158 vector<Input *> create_inputs(const vector<ConfigLine> &config,
159 map<string, Input *> *deserialized_inputs)
161 vector<Input *> inputs;
162 for (unsigned i = 0; i < config.size(); ++i) {
163 if (config[i].keyword != "stream") {
166 assert(config[i].arguments.size() == 1);
167 string stream_id = config[i].arguments[0];
169 map<string, string>::const_iterator src_it =
170 config[i].parameters.find("src");
171 if (src_it == config[i].parameters.end()) {
172 fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
177 string src = src_it->second;
179 map<string, Input *>::iterator deserialized_input_it =
180 deserialized_inputs->find(stream_id);
181 if (deserialized_input_it != deserialized_inputs->end()) {
182 input = deserialized_input_it->second;
183 if (input->get_url() != src) {
184 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
185 stream_id.c_str(), input->get_url().c_str(), src.c_str());
189 deserialized_inputs->erase(deserialized_input_it);
192 input = new Input(stream_id, src);
195 inputs.push_back(input);
200 void create_streams(const vector<ConfigLine> &config,
201 const set<string> &deserialized_stream_ids,
202 map<string, Input *> *deserialized_inputs)
204 set<string> expecting_stream_ids = deserialized_stream_ids;
205 map<pair<int, int>, MarkPool *> mark_pools;
206 for (unsigned i = 0; i < config.size(); ++i) {
207 if (config[i].keyword != "stream") {
210 if (config[i].arguments.size() != 1) {
211 fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
214 string stream_id = config[i].arguments[0];
215 if (deserialized_stream_ids.count(stream_id) == 0) {
216 servers->add_stream(stream_id);
218 expecting_stream_ids.erase(stream_id);
220 // Set up marks, if so desired.
221 map<string, string>::const_iterator mark_parm_it =
222 config[i].parameters.find("mark");
223 if (mark_parm_it != config[i].parameters.end()) {
224 MarkPool *mark_pool = parse_mark_pool(&mark_pools, mark_parm_it->second);
225 servers->set_mark_pool(stream_id, 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 starting.\n");
249 struct timeval serialize_start;
250 bool is_reexec = false;
252 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
253 vector<ConfigLine> config = parse_config(config_filename);
255 int port = fetch_config_int(config, "port", 1, 65535, PARAMATER_MANDATORY);
256 int num_servers = fetch_config_int(config, "num_servers", 1, 20000, PARAMATER_MANDATORY); // Insanely high max limit.
258 servers = new ServerPool(num_servers);
260 CubemapStateProto loaded_state;
261 int server_sock = -1, old_port = -1;
262 set<string> deserialized_stream_ids;
263 map<string, Input *> deserialized_inputs;
264 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
267 fprintf(stderr, "Deserializing state from previous process... ");
268 int state_fd = atoi(argv[3]);
269 loaded_state = read_tempfile(state_fd);
271 serialize_start.tv_sec = loaded_state.serialize_start_sec();
272 serialize_start.tv_usec = loaded_state.serialize_start_usec();
274 // Deserialize the streams.
275 for (int i = 0; i < loaded_state.streams_size(); ++i) {
276 servers->add_stream_from_serialized(loaded_state.streams(i));
277 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
280 // Deserialize the inputs. Note that we don't actually add them to any state yet.
281 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
282 deserialized_inputs.insert(make_pair(
283 loaded_state.inputs(i).stream_id(),
284 new Input(loaded_state.inputs(i))));
287 // Deserialize the server socket.
288 server_sock = loaded_state.server_sock();
289 old_port = loaded_state.port();
291 fprintf(stderr, "done.\n");
294 // Find all streams in the configuration file, and create them.
295 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
297 // Open a new server socket if we do not already have one, or if we changed ports.
298 if (server_sock != -1 && port != old_port) {
299 fprintf(stderr, "NOTE: Port changed from %d to %d; opening new socket.\n", old_port, port);
303 if (server_sock == -1) {
304 server_sock = create_server_socket(port);
307 // See if the user wants stats.
308 string stats_file = fetch_config_string(config, "stats_file", PARAMETER_OPTIONAL);
309 int stats_interval = fetch_config_int(config, "stats_interval", 1, INT_MAX, PARAMETER_OPTIONAL, -1);
310 if (stats_interval != -1 && stats_file.empty()) {
311 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
316 AcceptorThread acceptor_thread(server_sock);
317 acceptor_thread.run();
319 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
321 // All deserialized inputs should now have been taken care of, one way or the other.
322 assert(deserialized_inputs.empty());
325 // Put back the existing clients. It doesn't matter which server we
326 // allocate them to, so just do round-robin. However, we need to add
327 // them after the mark pools have been set up.
328 for (int i = 0; i < loaded_state.clients_size(); ++i) {
329 servers->add_client_from_serialized(loaded_state.clients(i));
333 // Start writing statistics.
334 StatsThread *stats_thread = NULL;
335 if (!stats_file.empty()) {
336 stats_thread = new StatsThread(stats_file, stats_interval);
342 struct timeval server_start;
343 gettimeofday(&server_start, NULL);
345 // Measure time from we started deserializing (below) to now, when basically everything
346 // is up and running. This is, in other words, a conservative estimate of how long our
347 // “glitch” period was, not counting of course reconnects if the configuration changed.
348 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
349 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
350 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
357 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
358 gettimeofday(&serialize_start, NULL);
360 if (stats_thread != NULL) {
361 stats_thread->stop();
363 acceptor_thread.stop();
365 CubemapStateProto state;
366 state.set_serialize_start_sec(serialize_start.tv_sec);
367 state.set_serialize_start_usec(serialize_start.tv_usec);
368 state.set_server_sock(server_sock);
369 state.set_port(port);
371 for (size_t i = 0; i < inputs.size(); ++i) {
373 state.add_inputs()->MergeFrom(inputs[i]->serialize());
376 for (int i = 0; i < num_servers; ++i) {
377 servers->get_server(i)->stop();
379 CubemapStateProto local_state = servers->get_server(i)->serialize();
381 // The stream state should be identical between the servers, so we only store it once.
383 state.mutable_streams()->MergeFrom(local_state.streams());
385 for (int j = 0; j < local_state.clients_size(); ++j) {
386 state.add_clients()->MergeFrom(local_state.clients(j));
391 fprintf(stderr, "Serializing state and re-execing...\n");
392 int state_fd = make_tempfile(state);
395 sprintf(buf, "%d", state_fd);
398 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
400 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);