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,
72 const vector<Acceptor *> acceptors,
73 const vector<Input *> inputs,
77 CubemapStateProto state;
78 state.set_serialize_start_sec(serialize_start.tv_sec);
79 state.set_serialize_start_usec(serialize_start.tv_usec);
81 for (size_t i = 0; i < acceptors.size(); ++i) {
82 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
85 for (size_t i = 0; i < inputs.size(); ++i) {
86 state.add_inputs()->MergeFrom(inputs[i]->serialize());
89 for (int i = 0; i < num_servers; ++i) {
90 CubemapStateProto local_state = servers->get_server(i)->serialize();
92 // The stream state should be identical between the servers, so we only store it once.
94 state.mutable_streams()->MergeFrom(local_state.streams());
96 for (int j = 0; j < local_state.clients_size(); ++j) {
97 state.add_clients()->MergeFrom(local_state.clients(j));
104 // Read the state back from the file descriptor made by make_tempfile,
106 CubemapStateProto read_tempfile(int state_fd)
108 if (lseek(state_fd, 0, SEEK_SET) == -1) {
116 ssize_t ret = read(state_fd, buf, sizeof(buf));
126 serialized.append(string(buf, buf + ret));
129 close(state_fd); // Implicitly deletes the file.
131 CubemapStateProto state;
132 if (!state.ParseFromString(serialized)) {
133 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
140 // Reuse mark pools if one already exists.
141 MarkPool *get_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, int from, int to)
143 pair<int, int> mark_range(from, to);
144 if (mark_pools->count(mark_range) != 0) {
145 return (*mark_pools)[mark_range];
148 // Check if we're overlapping some other mark pool.
149 for (map<pair<int, int>, MarkPool *>::const_iterator mp_it = mark_pools->begin();
150 mp_it != mark_pools->end();
152 int other_from = mp_it->first.first;
153 int other_to = mp_it->first.second;
154 if ((from >= other_from && from < other_to) ||
155 (to >= other_from && to < other_to)) {
156 fprintf(stderr, "WARNING: Mark pool %d-%d partially overlaps with %d-%d, you may get duplicate marks.\n",
157 from, to, other_from, other_to);
158 fprintf(stderr, " Mark pools must either be completely disjunct, or completely overlapping.\n");
162 MarkPool *mark_pool = new MarkPool(from, to);
163 mark_pools->insert(make_pair(mark_range, mark_pool));
167 MarkPool *parse_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, const string &mark_str)
169 size_t split = mark_str.find_first_of('-');
170 if (split == string::npos) {
171 fprintf(stderr, "WARNING: Invalid mark specification '%s' (expected 'X-Y'), ignoring.\n",
176 string from_str(mark_str.begin(), mark_str.begin() + split);
177 string to_str(mark_str.begin() + split + 1, mark_str.end());
178 int from = atoi(from_str.c_str());
179 int to = atoi(to_str.c_str());
181 if (from <= 0 || from >= 65536 || to <= 0 || to >= 65536) {
182 fprintf(stderr, "WARNING: Mark pool range %d-%d is outside legal range [1,65536>, ignoring.\n",
187 return get_mark_pool(mark_pools, from, to);
190 // Find all port statements in the configuration file, and create acceptors for htem.
191 vector<Acceptor *> create_acceptors(
192 const vector<ConfigLine> &config,
193 map<int, Acceptor *> *deserialized_acceptors)
195 vector<Acceptor *> acceptors;
196 for (unsigned i = 0; i < config.size(); ++i) {
197 if (config[i].keyword != "port") {
200 if (config[i].arguments.size() != 1) {
201 fprintf(stderr, "ERROR: 'port' takes exactly one argument\n");
204 int port = atoi(config[i].arguments[0].c_str());
205 if (port < 1 || port >= 65536) {
206 fprintf(stderr, "WARNING: port %d is out of range (must be [1,65536>), ignoring\n", port);
210 Acceptor *acceptor = NULL;
211 map<int, Acceptor *>::iterator deserialized_acceptor_it =
212 deserialized_acceptors->find(port);
213 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
214 acceptor = deserialized_acceptor_it->second;
215 deserialized_acceptors->erase(deserialized_acceptor_it);
217 int server_sock = create_server_socket(port);
218 acceptor = new Acceptor(server_sock, port);
221 acceptors.push_back(acceptor);
224 // Close all acceptors that are no longer in the configuration file.
225 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
226 acceptor_it != deserialized_acceptors->end();
228 acceptor_it->second->close_socket();
229 delete acceptor_it->second;
235 // Find all streams in the configuration file, and create inputs for them.
236 vector<Input *> create_inputs(const vector<ConfigLine> &config,
237 map<string, Input *> *deserialized_inputs)
239 vector<Input *> inputs;
240 for (unsigned i = 0; i < config.size(); ++i) {
241 if (config[i].keyword != "stream") {
244 assert(config[i].arguments.size() == 1);
245 string stream_id = config[i].arguments[0];
247 map<string, string>::const_iterator src_it =
248 config[i].parameters.find("src");
249 if (src_it == config[i].parameters.end()) {
250 fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
255 string src = src_it->second;
257 map<string, Input *>::iterator deserialized_input_it =
258 deserialized_inputs->find(stream_id);
259 if (deserialized_input_it != deserialized_inputs->end()) {
260 input = deserialized_input_it->second;
261 if (input->get_url() != src) {
262 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
263 stream_id.c_str(), input->get_url().c_str(), src.c_str());
267 deserialized_inputs->erase(deserialized_input_it);
270 input = new Input(stream_id, src);
273 inputs.push_back(input);
278 void create_streams(const vector<ConfigLine> &config,
279 const set<string> &deserialized_stream_ids,
280 map<string, Input *> *deserialized_inputs)
282 set<string> expecting_stream_ids = deserialized_stream_ids;
283 map<pair<int, int>, MarkPool *> mark_pools;
284 for (unsigned i = 0; i < config.size(); ++i) {
285 if (config[i].keyword != "stream") {
288 if (config[i].arguments.size() != 1) {
289 fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
292 string stream_id = config[i].arguments[0];
293 if (deserialized_stream_ids.count(stream_id) == 0) {
294 servers->add_stream(stream_id);
296 expecting_stream_ids.erase(stream_id);
298 // Set up marks, if so desired.
299 map<string, string>::const_iterator mark_parm_it =
300 config[i].parameters.find("mark");
301 if (mark_parm_it != config[i].parameters.end()) {
302 MarkPool *mark_pool = parse_mark_pool(&mark_pools, mark_parm_it->second);
303 servers->set_mark_pool(stream_id, mark_pool);
307 // Warn about any servers we've lost.
308 // TODO: Make an option (delete=yes?) to actually shut down streams.
309 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
310 stream_it != expecting_stream_ids.end();
312 string stream_id = *stream_it;
313 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
315 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
316 if (deserialized_inputs->count(stream_id) != 0) {
317 delete (*deserialized_inputs)[stream_id];
318 deserialized_inputs->erase(stream_id);
323 int main(int argc, char **argv)
325 fprintf(stderr, "\nCubemap starting.\n");
327 struct timeval serialize_start;
328 bool is_reexec = false;
330 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
331 vector<ConfigLine> config = parse_config(config_filename);
333 int num_servers = fetch_config_int(config, "num_servers", 1, 20000, PARAMATER_MANDATORY); // Insanely high max limit.
335 servers = new ServerPool(num_servers);
337 CubemapStateProto loaded_state;
338 set<string> deserialized_stream_ids;
339 map<string, Input *> deserialized_inputs;
340 map<int, Acceptor *> deserialized_acceptors;
341 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
344 fprintf(stderr, "Deserializing state from previous process... ");
345 int state_fd = atoi(argv[3]);
346 loaded_state = read_tempfile(state_fd);
348 serialize_start.tv_sec = loaded_state.serialize_start_sec();
349 serialize_start.tv_usec = loaded_state.serialize_start_usec();
351 // Deserialize the streams.
352 for (int i = 0; i < loaded_state.streams_size(); ++i) {
353 servers->add_stream_from_serialized(loaded_state.streams(i));
354 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
357 // Deserialize the inputs. Note that we don't actually add them to any state yet.
358 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
359 deserialized_inputs.insert(make_pair(
360 loaded_state.inputs(i).stream_id(),
361 new Input(loaded_state.inputs(i))));
364 // Convert the acceptor from older serialized formats.
365 if (loaded_state.has_server_sock() && loaded_state.has_port()) {
366 AcceptorProto *acceptor = loaded_state.add_acceptors();
367 acceptor->set_server_sock(loaded_state.server_sock());
368 acceptor->set_port(loaded_state.port());
371 // Deserialize the acceptors.
372 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
373 deserialized_acceptors.insert(make_pair(
374 loaded_state.acceptors(i).port(),
375 new Acceptor(loaded_state.acceptors(i))));
378 fprintf(stderr, "done.\n");
381 // Find all streams in the configuration file, and create them.
382 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
384 // See if the user wants stats.
385 string stats_file = fetch_config_string(config, "stats_file", PARAMETER_OPTIONAL);
386 int stats_interval = fetch_config_int(config, "stats_interval", 1, INT_MAX, PARAMETER_OPTIONAL, -1);
387 if (stats_interval != -1 && stats_file.empty()) {
388 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
393 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
394 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
396 // All deserialized inputs should now have been taken care of, one way or the other.
397 assert(deserialized_inputs.empty());
400 // Put back the existing clients. It doesn't matter which server we
401 // allocate them to, so just do round-robin. However, we need to add
402 // them after the mark pools have been set up.
403 for (int i = 0; i < loaded_state.clients_size(); ++i) {
404 servers->add_client_from_serialized(loaded_state.clients(i));
408 // Start writing statistics.
409 StatsThread *stats_thread = NULL;
410 if (!stats_file.empty()) {
411 stats_thread = new StatsThread(stats_file, stats_interval);
417 struct timeval server_start;
418 gettimeofday(&server_start, NULL);
420 // Measure time from we started deserializing (below) to now, when basically everything
421 // is up and running. This is, in other words, a conservative estimate of how long our
422 // “glitch” period was, not counting of course reconnects if the configuration changed.
423 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
424 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
425 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
432 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
433 gettimeofday(&serialize_start, NULL);
435 if (stats_thread != NULL) {
436 stats_thread->stop();
438 for (size_t i = 0; i < acceptors.size(); ++i) {
439 acceptors[i]->stop();
441 for (size_t i = 0; i < inputs.size(); ++i) {
446 fprintf(stderr, "Serializing state and re-execing...\n");
447 int state_fd = make_tempfile(collect_state(
448 serialize_start, acceptors, inputs, servers, num_servers));
452 sprintf(buf, "%d", state_fd);
455 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
457 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);