4 #include <google/protobuf/stubs/common.h>
23 #include "serverpool.h"
31 ServerPool *servers = NULL;
32 volatile bool hupped = false;
39 CubemapStateProto collect_state(const timeval &serialize_start,
40 const vector<Acceptor *> acceptors,
41 const vector<Input *> inputs,
44 CubemapStateProto state = servers->serialize(); // Fills streams() and clients().
45 state.set_serialize_start_sec(serialize_start.tv_sec);
46 state.set_serialize_start_usec(serialize_start.tv_usec);
48 for (size_t i = 0; i < acceptors.size(); ++i) {
49 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
52 for (size_t i = 0; i < inputs.size(); ++i) {
53 state.add_inputs()->MergeFrom(inputs[i]->serialize());
59 // Find all port statements in the configuration file, and create acceptors for htem.
60 vector<Acceptor *> create_acceptors(
62 map<int, Acceptor *> *deserialized_acceptors)
64 vector<Acceptor *> acceptors;
65 for (unsigned i = 0; i < config.acceptors.size(); ++i) {
66 const AcceptorConfig &acceptor_config = config.acceptors[i];
67 Acceptor *acceptor = NULL;
68 map<int, Acceptor *>::iterator deserialized_acceptor_it =
69 deserialized_acceptors->find(acceptor_config.port);
70 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
71 acceptor = deserialized_acceptor_it->second;
72 deserialized_acceptors->erase(deserialized_acceptor_it);
74 int server_sock = create_server_socket(acceptor_config.port, TCP_SOCKET);
75 acceptor = new Acceptor(server_sock, acceptor_config.port);
78 acceptors.push_back(acceptor);
81 // Close all acceptors that are no longer in the configuration file.
82 for (map<int, Acceptor *>::iterator acceptor_it = deserialized_acceptors->begin();
83 acceptor_it != deserialized_acceptors->end();
85 acceptor_it->second->close_socket();
86 delete acceptor_it->second;
92 // Find all streams in the configuration file, and create inputs for them.
93 vector<Input *> create_inputs(const Config &config,
94 map<string, Input *> *deserialized_inputs)
96 vector<Input *> inputs;
97 for (unsigned i = 0; i < config.streams.size(); ++i) {
98 const StreamConfig &stream_config = config.streams[i];
99 if (stream_config.src.empty()) {
103 string stream_id = stream_config.stream_id;
104 string src = stream_config.src;
107 map<string, Input *>::iterator deserialized_input_it =
108 deserialized_inputs->find(stream_id);
109 if (deserialized_input_it != deserialized_inputs->end()) {
110 input = deserialized_input_it->second;
111 if (input->get_url() != src) {
112 fprintf(stderr, "INFO: Stream '%s' has changed URL from '%s' to '%s', restarting input.\n",
113 stream_id.c_str(), input->get_url().c_str(), src.c_str());
114 input->close_socket();
118 deserialized_inputs->erase(deserialized_input_it);
121 input = create_input(stream_id, src);
123 fprintf(stderr, "ERROR: did not understand URL '%s', clients will not get any data.\n",
129 inputs.push_back(input);
134 void create_streams(const Config &config,
135 const set<string> &deserialized_stream_ids,
136 map<string, Input *> *deserialized_inputs)
138 vector<MarkPool *> mark_pools; // FIXME: leak
139 for (unsigned i = 0; i < config.mark_pools.size(); ++i) {
140 const MarkPoolConfig &mp_config = config.mark_pools[i];
141 mark_pools.push_back(new MarkPool(mp_config.from, mp_config.to));
144 set<string> expecting_stream_ids = deserialized_stream_ids;
145 for (unsigned i = 0; i < config.streams.size(); ++i) {
146 const StreamConfig &stream_config = config.streams[i];
147 if (deserialized_stream_ids.count(stream_config.stream_id) == 0) {
148 servers->add_stream(stream_config.stream_id, stream_config.backlog_size);
150 expecting_stream_ids.erase(stream_config.stream_id);
152 if (stream_config.mark_pool != -1) {
153 servers->set_mark_pool(stream_config.stream_id,
154 mark_pools[stream_config.mark_pool]);
158 // Warn about any servers we've lost.
159 // TODO: Make an option (delete=yes?) to actually shut down streams.
160 for (set<string>::const_iterator stream_it = expecting_stream_ids.begin();
161 stream_it != expecting_stream_ids.end();
163 string stream_id = *stream_it;
164 fprintf(stderr, "WARNING: stream '%s' disappeared from the configuration file.\n",
166 fprintf(stderr, " It will not be deleted, but clients will not get any new inputs.\n");
167 if (deserialized_inputs->count(stream_id) != 0) {
168 delete (*deserialized_inputs)[stream_id];
169 deserialized_inputs->erase(stream_id);
174 bool dry_run_config(const std::string &argv0, const std::string &config_filename)
176 char *argv0_copy = strdup(argv0.c_str());
177 char *config_filename_copy = strdup(config_filename.c_str());
184 free(config_filename_copy);
188 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
197 free(config_filename_copy);
202 err = waitpid(pid, &status, 0);
203 } while (err == -1 && errno == EINTR);
210 return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
213 int main(int argc, char **argv)
217 bool test_config = false;
219 static const option long_options[] = {
220 { "state", required_argument, 0, 's' },
221 { "test-config", no_argument, 0, 't' },
223 int option_index = 0;
224 int c = getopt_long (argc, argv, "s:t", long_options, &option_index);
231 state_fd = atoi(optarg);
241 string config_filename = "cubemap.config";
243 config_filename = argv[optind++];
247 if (!parse_config(config_filename, &config)) {
255 fprintf(stderr, "\nCubemap " SERVER_VERSION " starting.\n");
256 servers = new ServerPool(config.num_servers);
258 CubemapStateProto loaded_state;
259 struct timeval serialize_start;
260 set<string> deserialized_stream_ids;
261 map<string, Input *> deserialized_inputs;
262 map<int, Acceptor *> deserialized_acceptors;
263 if (state_fd != -1) {
264 fprintf(stderr, "Deserializing state from previous process... ");
266 if (!read_tempfile(state_fd, &serialized)) {
269 if (!loaded_state.ParseFromString(serialized)) {
270 fprintf(stderr, "ERROR: Failed deserialization of state.\n");
274 serialize_start.tv_sec = loaded_state.serialize_start_sec();
275 serialize_start.tv_usec = loaded_state.serialize_start_usec();
277 // Deserialize the streams.
278 for (int i = 0; i < loaded_state.streams_size(); ++i) {
279 servers->add_stream_from_serialized(loaded_state.streams(i));
280 deserialized_stream_ids.insert(loaded_state.streams(i).stream_id());
283 // Deserialize the inputs. Note that we don't actually add them to any state yet.
284 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
285 deserialized_inputs.insert(make_pair(
286 loaded_state.inputs(i).stream_id(),
287 create_input(loaded_state.inputs(i))));
290 // Deserialize the acceptors.
291 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
292 deserialized_acceptors.insert(make_pair(
293 loaded_state.acceptors(i).port(),
294 new Acceptor(loaded_state.acceptors(i))));
297 fprintf(stderr, "done.\n");
300 // Find all streams in the configuration file, and create them.
301 create_streams(config, deserialized_stream_ids, &deserialized_inputs);
305 vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
306 vector<Input *> inputs = create_inputs(config, &deserialized_inputs);
308 // All deserialized inputs should now have been taken care of, one way or the other.
309 assert(deserialized_inputs.empty());
311 // Put back the existing clients. It doesn't matter which server we
312 // allocate them to, so just do round-robin. However, we need to add
313 // them after the mark pools have been set up.
314 for (int i = 0; i < loaded_state.clients_size(); ++i) {
315 servers->add_client_from_serialized(loaded_state.clients(i));
318 // Start writing statistics.
319 StatsThread *stats_thread = NULL;
320 if (!config.stats_file.empty()) {
321 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
327 struct timeval server_start;
328 gettimeofday(&server_start, NULL);
329 if (state_fd != -1) {
330 // Measure time from we started deserializing (below) to now, when basically everything
331 // is up and running. This is, in other words, a conservative estimate of how long our
332 // “glitch” period was, not counting of course reconnects if the configuration changed.
333 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
334 1e-6 * (server_start.tv_usec - serialize_start.tv_usec);
335 fprintf(stderr, "Re-exec happened in approx. %.0f ms.\n", glitch_time * 1000.0);
342 // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
343 gettimeofday(&serialize_start, NULL);
345 if (stats_thread != NULL) {
346 stats_thread->stop();
348 for (size_t i = 0; i < acceptors.size(); ++i) {
349 acceptors[i]->stop();
351 for (size_t i = 0; i < inputs.size(); ++i) {
356 fprintf(stderr, "Serializing state and re-execing...\n");
357 CubemapStateProto state = collect_state(
358 serialize_start, acceptors, inputs, servers);
360 state.SerializeToString(&serialized);
361 state_fd = make_tempfile(serialized);
362 if (state_fd == -1) {
367 if (!dry_run_config(argv[0], config_filename)) {
368 fprintf(stderr, "ERROR: %s --test-config failed. Restarting old version instead of new.\n", argv[0]);
374 sprintf(buf, "%d", state_fd);
377 execlp(argv[0], argv[0], config_filename.c_str(), "--state", buf, NULL);
379 fprintf(stderr, "PANIC: re-exec of %s failed. Waiting 0.2 seconds and trying again...\n", argv[0]);