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 CubemapStateProto collect_state(const timeval &serialize_start,
74 const vector<Input *> inputs,
78 CubemapStateProto state;
79 state.set_serialize_start_sec(serialize_start.tv_sec);
80 state.set_serialize_start_usec(serialize_start.tv_usec);
81 state.set_server_sock(server_sock);
84 for (size_t i = 0; i < inputs.size(); ++i) {
85 state.add_inputs()->MergeFrom(inputs[i]->serialize());
88 for (int i = 0; i < num_servers; ++i) {
89 CubemapStateProto local_state = servers->get_server(i)->serialize();
91 // The stream state should be identical between the servers, so we only store it once.
93 state.mutable_streams()->MergeFrom(local_state.streams());
95 for (int j = 0; j < local_state.clients_size(); ++j) {
96 state.add_clients()->MergeFrom(local_state.clients(j));
103 // Read the state back from the file descriptor made by make_tempfile,
105 CubemapStateProto read_tempfile(int state_fd)
107 if (lseek(state_fd, 0, SEEK_SET) == -1) {
115 ssize_t ret = read(state_fd, buf, sizeof(buf));
125 serialized.append(string(buf, buf + ret));
128 close(state_fd); // Implicitly deletes the file.
130 CubemapStateProto state;
131 if (!state.ParseFromString(serialized)) {
132 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
139 // Reuse mark pools if one already exists.
140 MarkPool *get_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, int from, int to)
142 pair<int, int> mark_range(from, to);
143 if (mark_pools->count(mark_range) != 0) {
144 return (*mark_pools)[mark_range];
147 // Check if we're overlapping some other mark pool.
148 for (map<pair<int, int>, MarkPool *>::const_iterator mp_it = mark_pools->begin();
149 mp_it != mark_pools->end();
151 int other_from = mp_it->first.first;
152 int other_to = mp_it->first.second;
153 if ((from >= other_from && from < other_to) ||
154 (to >= other_from && to < other_to)) {
155 fprintf(stderr, "WARNING: Mark pool %d-%d partially overlaps with %d-%d, you may get duplicate marks.\n",
156 from, to, other_from, other_to);
157 fprintf(stderr, " Mark pools must either be completely disjunct, or completely overlapping.\n");
161 MarkPool *mark_pool = new MarkPool(from, to);
162 mark_pools->insert(make_pair(mark_range, mark_pool));
166 MarkPool *parse_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, const string &mark_str)
168 size_t split = mark_str.find_first_of('-');
169 if (split == string::npos) {
170 fprintf(stderr, "WARNING: Invalid mark specification '%s' (expected 'X-Y'), ignoring.\n",
175 string from_str(mark_str.begin(), mark_str.begin() + split);
176 string to_str(mark_str.begin() + split + 1, mark_str.end());
177 int from = atoi(from_str.c_str());
178 int to = atoi(to_str.c_str());
180 if (from <= 0 || from >= 65536 || to <= 0 || to >= 65536) {
181 fprintf(stderr, "WARNING: Mark pool range %d-%d is outside legal range [1,65536>, ignoring.\n",
186 return get_mark_pool(mark_pools, from, to);
189 // Find all streams in the configuration file, and create inputs for them.
190 vector<Input *> create_inputs(const vector<ConfigLine> &config,
191 map<string, Input *> *deserialized_inputs)
193 vector<Input *> inputs;
194 for (unsigned i = 0; i < config.size(); ++i) {
195 if (config[i].keyword != "stream") {
198 assert(config[i].arguments.size() == 1);
199 string stream_id = config[i].arguments[0];
201 map<string, string>::const_iterator src_it =
202 config[i].parameters.find("src");
203 if (src_it == config[i].parameters.end()) {
204 fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
209 string src = src_it->second;
211 map<string, Input *>::iterator deserialized_input_it =
212 deserialized_inputs->find(stream_id);
213 if (deserialized_input_it != deserialized_inputs->end()) {
214 input = deserialized_input_it->second;
215 if (input->get_url() != src) {
216 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
217 stream_id.c_str(), input->get_url().c_str(), src.c_str());
221 deserialized_inputs->erase(deserialized_input_it);
224 input = new Input(stream_id, src);
227 inputs.push_back(input);
232 void create_streams(const vector<ConfigLine> &config,
233 const set<string> &deserialized_stream_ids,
234 map<string, Input *> *deserialized_inputs)
236 set<string> expecting_stream_ids = deserialized_stream_ids;
237 map<pair<int, int>, MarkPool *> mark_pools;
238 for (unsigned i = 0; i < config.size(); ++i) {
239 if (config[i].keyword != "stream") {
242 if (config[i].arguments.size() != 1) {
243 fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
246 string stream_id = config[i].arguments[0];
247 if (deserialized_stream_ids.count(stream_id) == 0) {
248 servers->add_stream(stream_id);
250 expecting_stream_ids.erase(stream_id);
252 // Set up marks, if so desired.
253 map<string, string>::const_iterator mark_parm_it =
254 config[i].parameters.find("mark");
255 if (mark_parm_it != config[i].parameters.end()) {
256 MarkPool *mark_pool = parse_mark_pool(&mark_pools, mark_parm_it->second);
257 servers->set_mark_pool(stream_id, mark_pool);
261 // Warn about any servers we've lost.
262 // TODO: Make an option (delete=yes?) to actually shut down streams.
263 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
264 stream_it != expecting_stream_ids.end();
266 string stream_id = *stream_it;
267 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
269 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
270 if (deserialized_inputs->count(stream_id) != 0) {
271 delete (*deserialized_inputs)[stream_id];
272 deserialized_inputs->erase(stream_id);
277 int main(int argc, char **argv)
279 fprintf(stderr, "\nCubemap starting.\n");
281 struct timeval serialize_start;
282 bool is_reexec = false;
284 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
285 vector<ConfigLine> config = parse_config(config_filename);
287 int port = fetch_config_int(config, "port", 1, 65535, PARAMATER_MANDATORY);
288 int num_servers = fetch_config_int(config, "num_servers", 1, 20000, PARAMATER_MANDATORY); // Insanely high max limit.
290 servers = new ServerPool(num_servers);
292 CubemapStateProto loaded_state;
293 int server_sock = -1, old_port = -1;
294 set<string> deserialized_stream_ids;
295 map<string, Input *> deserialized_inputs;
296 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
299 fprintf(stderr, "Deserializing state from previous process... ");
300 int state_fd = atoi(argv[3]);
301 loaded_state = read_tempfile(state_fd);
303 serialize_start.tv_sec = loaded_state.serialize_start_sec();
304 serialize_start.tv_usec = loaded_state.serialize_start_usec();
306 // Deserialize the streams.
307 for (int i = 0; i < loaded_state.streams_size(); ++i) {
308 servers->add_stream_from_serialized(loaded_state.streams(i));
309 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
312 // Deserialize the inputs. Note that we don't actually add them to any state yet.
313 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
314 deserialized_inputs.insert(make_pair(
315 loaded_state.inputs(i).stream_id(),
316 new Input(loaded_state.inputs(i))));
319 // Deserialize the server socket.
320 server_sock = loaded_state.server_sock();
321 old_port = loaded_state.port();
323 fprintf(stderr, "done.\n");
326 // Find all streams in the configuration file, and create them.
327 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
329 // Open a new server socket if we do not already have one, or if we changed ports.
330 if (server_sock != -1 && port != old_port) {
331 fprintf(stderr, "NOTE: Port changed from %d to %d; opening new socket.\n", old_port, port);
335 if (server_sock == -1) {
336 server_sock = create_server_socket(port);
339 // See if the user wants stats.
340 string stats_file = fetch_config_string(config, "stats_file", PARAMETER_OPTIONAL);
341 int stats_interval = fetch_config_int(config, "stats_interval", 1, INT_MAX, PARAMETER_OPTIONAL, -1);
342 if (stats_interval != -1 && stats_file.empty()) {
343 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
348 AcceptorThread acceptor_thread(server_sock);
349 acceptor_thread.run();
351 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
353 // All deserialized inputs should now have been taken care of, one way or the other.
354 assert(deserialized_inputs.empty());
357 // Put back the existing clients. It doesn't matter which server we
358 // allocate them to, so just do round-robin. However, we need to add
359 // them after the mark pools have been set up.
360 for (int i = 0; i < loaded_state.clients_size(); ++i) {
361 servers->add_client_from_serialized(loaded_state.clients(i));
365 // Start writing statistics.
366 StatsThread *stats_thread = NULL;
367 if (!stats_file.empty()) {
368 stats_thread = new StatsThread(stats_file, stats_interval);
374 struct timeval server_start;
375 gettimeofday(&server_start, NULL);
377 // Measure time from we started deserializing (below) to now, when basically everything
378 // is up and running. This is, in other words, a conservative estimate of how long our
379 // “glitch” period was, not counting of course reconnects if the configuration changed.
380 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
381 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
382 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
389 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
390 gettimeofday(&serialize_start, NULL);
392 if (stats_thread != NULL) {
393 stats_thread->stop();
395 acceptor_thread.stop();
396 for (size_t i = 0; i < inputs.size(); ++i) {
401 fprintf(stderr, "Serializing state and re-execing...\n");
402 int state_fd = make_tempfile(collect_state(
403 serialize_start, server_sock, port, inputs, servers, num_servers));
407 sprintf(buf, "%d", state_fd);
410 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
412 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);