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,
79 CubemapStateProto state;
80 state.set_serialize_start_sec(serialize_start.tv_sec);
81 state.set_serialize_start_usec(serialize_start.tv_usec);
83 for (size_t i = 0; i < acceptors.size(); ++i) {
84 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
87 for (size_t i = 0; i < inputs.size(); ++i) {
88 state.add_inputs()->MergeFrom(inputs[i]->serialize());
91 for (int i = 0; i < num_servers; ++i) {
92 CubemapStateProto local_state = servers->get_server(i)->serialize();
94 // The stream state should be identical between the servers, so we only store it once.
96 state.mutable_streams()->MergeFrom(local_state.streams());
98 for (int j = 0; j < local_state.clients_size(); ++j) {
99 state.add_clients()->MergeFrom(local_state.clients(j));
106 // Read the state back from the file descriptor made by make_tempfile,
108 CubemapStateProto read_tempfile(int state_fd)
110 if (lseek(state_fd, 0, SEEK_SET) == -1) {
118 ssize_t ret = read(state_fd, buf, sizeof(buf));
128 serialized.append(string(buf, buf + ret));
131 close(state_fd); // Implicitly deletes the file.
133 CubemapStateProto state;
134 if (!state.ParseFromString(serialized)) {
135 fprintf(stderr, "PANIC: Failed deserialization of state.\n");
142 // Reuse mark pools if one already exists.
143 MarkPool *get_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, int from, int to)
145 pair<int, int> mark_range(from, to);
146 if (mark_pools->count(mark_range) != 0) {
147 return (*mark_pools)[mark_range];
150 // Check if we're overlapping some other mark pool.
151 for (map<pair<int, int>, MarkPool *>::const_iterator mp_it = mark_pools->begin();
152 mp_it != mark_pools->end();
154 int other_from = mp_it->first.first;
155 int other_to = mp_it->first.second;
156 if ((from >= other_from && from < other_to) ||
157 (to >= other_from && to < other_to)) {
158 fprintf(stderr, "WARNING: Mark pool %d-%d partially overlaps with %d-%d, you may get duplicate marks.\n",
159 from, to, other_from, other_to);
160 fprintf(stderr, " Mark pools must either be completely disjunct, or completely overlapping.\n");
164 MarkPool *mark_pool = new MarkPool(from, to);
165 mark_pools->insert(make_pair(mark_range, mark_pool));
169 MarkPool *parse_mark_pool(map<pair<int, int>, MarkPool *> *mark_pools, const string &mark_str)
171 size_t split = mark_str.find_first_of('-');
172 if (split == string::npos) {
173 fprintf(stderr, "WARNING: Invalid mark specification '%s' (expected 'X-Y'), ignoring.\n",
178 string from_str(mark_str.begin(), mark_str.begin() + split);
179 string to_str(mark_str.begin() + split + 1, mark_str.end());
180 int from = atoi(from_str.c_str());
181 int to = atoi(to_str.c_str());
183 if (from <= 0 || from >= 65536 || to <= 0 || to >= 65536) {
184 fprintf(stderr, "WARNING: Mark pool range %d-%d is outside legal range [1,65536>, ignoring.\n",
189 return get_mark_pool(mark_pools, from, to);
192 // Find all port statements in the configuration file, and create acceptors for htem.
193 vector<Acceptor *> create_acceptors(
194 const vector<ConfigLine> &config,
195 map<int, Acceptor *> *deserialized_acceptors)
197 vector<Acceptor *> acceptors;
198 for (unsigned i = 0; i < config.size(); ++i) {
199 if (config[i].keyword != "port") {
202 if (config[i].arguments.size() != 1) {
203 fprintf(stderr, "ERROR: 'port' takes exactly one argument\n");
206 int port = atoi(config[i].arguments[0].c_str());
207 if (port < 1 || port >= 65536) {
208 fprintf(stderr, "WARNING: port %d is out of range (must be [1,65536>), ignoring\n", port);
212 Acceptor *acceptor = NULL;
213 map<int, Acceptor *>::iterator deserialized_acceptor_it =
214 deserialized_acceptors->find(port);
215 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
216 acceptor = deserialized_acceptor_it->second;
217 deserialized_acceptors->erase(deserialized_acceptor_it);
219 int server_sock = create_server_socket(port, TCP_SOCKET);
220 acceptor = new Acceptor(server_sock, port);
223 acceptors.push_back(acceptor);
226 // Close all acceptors that are no longer in the configuration file.
227 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
228 acceptor_it != deserialized_acceptors->end();
230 acceptor_it->second->close_socket();
231 delete acceptor_it->second;
237 // Find all streams in the configuration file, and create inputs for them.
238 vector<Input *> create_inputs(const vector<ConfigLine> &config,
239 map<string, Input *> *deserialized_inputs)
241 vector<Input *> inputs;
242 for (unsigned i = 0; i < config.size(); ++i) {
243 if (config[i].keyword != "stream") {
246 assert(config[i].arguments.size() == 1);
247 string stream_id = config[i].arguments[0];
249 map<string, string>::const_iterator src_it =
250 config[i].parameters.find("src");
251 if (src_it == config[i].parameters.end()) {
252 fprintf(stderr, "WARNING: stream '%s' has no src= attribute, clients will not get any data.\n",
257 string src = src_it->second;
259 map<string, Input *>::iterator deserialized_input_it =
260 deserialized_inputs->find(stream_id);
261 if (deserialized_input_it != deserialized_inputs->end()) {
262 input = deserialized_input_it->second;
263 if (input->get_url() != src) {
264 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
265 stream_id.c_str(), input->get_url().c_str(), src.c_str());
266 input->close_socket();
270 deserialized_inputs->erase(deserialized_input_it);
273 input = create_input(stream_id, src);
275 fprintf(stderr, "ERROR: did not understand URL '%s', clients will not get any data.\n",
281 inputs.push_back(input);
286 void create_streams(const vector<ConfigLine> &config,
287 const set<string> &deserialized_stream_ids,
288 map<string, Input *> *deserialized_inputs)
290 set<string> expecting_stream_ids = deserialized_stream_ids;
291 map<pair<int, int>, MarkPool *> mark_pools;
292 for (unsigned i = 0; i < config.size(); ++i) {
293 if (config[i].keyword != "stream") {
296 if (config[i].arguments.size() != 1) {
297 fprintf(stderr, "ERROR: 'stream' takes exactly one argument\n");
300 string stream_id = config[i].arguments[0];
301 if (deserialized_stream_ids.count(stream_id) == 0) {
302 servers->add_stream(stream_id);
304 expecting_stream_ids.erase(stream_id);
306 // Set up marks, if so desired.
307 map<string, string>::const_iterator mark_parm_it =
308 config[i].parameters.find("mark");
309 if (mark_parm_it != config[i].parameters.end()) {
310 MarkPool *mark_pool = parse_mark_pool(&mark_pools, mark_parm_it->second);
311 servers->set_mark_pool(stream_id, mark_pool);
315 // Warn about any servers we've lost.
316 // TODO: Make an option (delete=yes?) to actually shut down streams.
317 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
318 stream_it != expecting_stream_ids.end();
320 string stream_id = *stream_it;
321 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
323 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
324 if (deserialized_inputs->count(stream_id) != 0) {
325 delete (*deserialized_inputs)[stream_id];
326 deserialized_inputs->erase(stream_id);
331 int main(int argc, char **argv)
333 fprintf(stderr, "\nCubemap " SERVER_VERSION " starting.\n");
335 struct timeval serialize_start;
336 bool is_reexec = false;
338 string config_filename = (argc == 1) ? "cubemap.config" : argv[1];
339 vector<ConfigLine> config = parse_config(config_filename);
341 int num_servers = fetch_config_int(config, "num_servers", 1, 20000, PARAMATER_MANDATORY); // Insanely high max limit.
343 servers = new ServerPool(num_servers);
345 CubemapStateProto loaded_state;
346 set<string> deserialized_stream_ids;
347 map<string, Input *> deserialized_inputs;
348 map<int, Acceptor *> deserialized_acceptors;
349 if (argc == 4 && strcmp(argv[2], "-state") == 0) {
352 fprintf(stderr, "Deserializing state from previous process... ");
353 int state_fd = atoi(argv[3]);
354 loaded_state = read_tempfile(state_fd);
356 serialize_start.tv_sec = loaded_state.serialize_start_sec();
357 serialize_start.tv_usec = loaded_state.serialize_start_usec();
359 // Deserialize the streams.
360 for (int i = 0; i < loaded_state.streams_size(); ++i) {
361 servers->add_stream_from_serialized(loaded_state.streams(i));
362 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
365 // Deserialize the inputs. Note that we don't actually add them to any state yet.
366 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
367 deserialized_inputs.insert(make_pair(
368 loaded_state.inputs(i).stream_id(),
369 create_input(loaded_state.inputs(i))));
372 // Convert the acceptor from older serialized formats.
373 if (loaded_state.has_server_sock() && loaded_state.has_port()) {
374 AcceptorProto *acceptor = loaded_state.add_acceptors();
375 acceptor->set_server_sock(loaded_state.server_sock());
376 acceptor->set_port(loaded_state.port());
379 // Deserialize the acceptors.
380 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
381 deserialized_acceptors.insert(make_pair(
382 loaded_state.acceptors(i).port(),
383 new Acceptor(loaded_state.acceptors(i))));
386 fprintf(stderr, "done.\n");
389 // Find all streams in the configuration file, and create them.
390 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
392 // See if the user wants stats.
393 string stats_file = fetch_config_string(config, "stats_file", PARAMETER_OPTIONAL);
394 int stats_interval = fetch_config_int(config, "stats_interval", 1, INT_MAX, PARAMETER_OPTIONAL, -1);
395 if (stats_interval != -1 && stats_file.empty()) {
396 fprintf(stderr, "WARNING: 'stats_interval' given, but no 'stats_file'. No statistics will be written.\n");
401 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
402 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
404 // All deserialized inputs should now have been taken care of, one way or the other.
405 assert(deserialized_inputs.empty());
408 // Put back the existing clients. It doesn't matter which server we
409 // allocate them to, so just do round-robin. However, we need to add
410 // them after the mark pools have been set up.
411 for (int i = 0; i < loaded_state.clients_size(); ++i) {
412 servers->add_client_from_serialized(loaded_state.clients(i));
416 // Start writing statistics.
417 StatsThread *stats_thread = NULL;
418 if (!stats_file.empty()) {
419 stats_thread = new StatsThread(stats_file, stats_interval);
425 struct timeval server_start;
426 gettimeofday(&server_start, NULL);
428 // Measure time from we started deserializing (below) to now, when basically everything
429 // is up and running. This is, in other words, a conservative estimate of how long our
430 // “glitch” period was, not counting of course reconnects if the configuration changed.
431 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
432 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
433 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
440 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
441 gettimeofday(&serialize_start, NULL);
443 if (stats_thread != NULL) {
444 stats_thread->stop();
446 for (size_t i = 0; i < acceptors.size(); ++i) {
447 acceptors[i]->stop();
449 for (size_t i = 0; i < inputs.size(); ++i) {
454 fprintf(stderr, "Serializing state and re-execing...\n");
455 int state_fd = make_tempfile(collect_state(
456 serialize_start, acceptors, inputs, servers, num_servers));
460 sprintf(buf, "%d", state_fd);
463 execlp(argv[0], argv[0], config_filename.c_str(), "-state", buf, NULL);
465 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);