11 // Tokenize a string, allow quoting
12 // TODO doesn't yet allow quoting...
13 static std::vector<std::string> tokenize(std::string arg)
15 // TODO rewrite to be more efficient.
17 istringstream iss(arg);
18 return vector<string>(istream_iterator<string>(iss), istream_iterator<string>());
21 // Find the requested service by name
22 static ServiceRecord * findService(const std::list<ServiceRecord *> & records,
26 list<ServiceRecord *>::const_iterator i = records.begin();
27 for ( ; i != records.end(); i++ ) {
28 if (strcmp((*i)->getServiceName(), name) == 0) {
32 return (ServiceRecord *)0;
35 ServiceRecord * ServiceSet::findService(std::string name)
37 return ::findService(records, name.c_str());
40 void ServiceSet::startService(const char *name)
43 ServiceRecord *record = loadServiceRecord(name);
48 void ServiceSet::stopService(const std::string & name)
50 ServiceRecord *record = findService(name);
51 if (record != nullptr) {
56 // Called when a service has actually stopped.
57 void ServiceRecord::stopped()
59 service_state = SVC_STOPPED;
62 // Stop any dependencies whose desired state is SVC_STOPPED:
63 for (sr_iter i = depends_on.begin(); i != depends_on.end(); i++) {
64 (*i)->dependentStopped();
67 service_set->service_inactive(this);
69 // TODO inform listeners.
70 if (desired_state == SVC_STARTED) {
71 // Desired state is "started".
76 void ServiceRecord::process_child_callback(struct ev_loop *loop, ev_child *w, int revents)
78 ServiceRecord *sr = (ServiceRecord *) w->data;
81 ev_child_stop(ev_default_loop(EVFLAG_AUTO), &sr->child_listener);
83 // Ok, for a process service, any process death which we didn't rig
84 // ourselves is a bit... unexpected. Probably, the child died because
85 // we asked it to (sr->service_state == SVC_STOPPING). But even if
86 // we didn't, there's not much we can do.
88 if (sr->service_type == SVC_PROCESS) {
89 // TODO log non-zero rstatus?
90 if (sr->service_state == SVC_STOPPING) {
97 if (sr->auto_restart && sr->service_set->get_auto_restart()) {
101 else { // SVC_SCRIPTED
102 if (sr->service_state == SVC_STOPPING) {
103 if (w->rstatus == 0) {
108 // ??? failed to stop!
109 // For now just pretend we stopped, so that any dependencies
114 else { // SVC_STARTING
115 if (w->rstatus == 0) {
120 sr->failed_to_start();
126 void ServiceRecord::start()
128 if ((service_state == SVC_STARTING || service_state == SVC_STARTED)
129 && desired_state == SVC_STOPPED) {
130 // This service was starting, or started, but was set to be stopped.
131 // Cancel the stop (and continue starting/running).
132 // TODO any listeners waiting for stop should be notified of
136 desired_state = SVC_STARTED;
138 if (service_state != SVC_STOPPED) {
139 // Either we need do nothing (service is already started/starting)
140 // or the service is currently being stopped and we must wait for
145 // Service state is SVC_STOPPED. Start the service.
147 // First, start dependencies
148 bool all_deps_started = true;
149 for (sr_iter i = depends_on.begin(); i != depends_on.end(); ++i) {
150 // Note, we cannot treat a dependency as started if its force_stop
152 if ((*i)->service_state != SVC_STARTED || (*i)->force_stop) {
153 all_deps_started = false;
158 if (! all_deps_started) {
159 // The dependencies will notify this service once they've started.
163 // Actually start this service.
164 service_state = SVC_STARTING;
165 service_set->service_active(this);
167 if (service_type == SVC_PROCESS) {
168 bool start_success = start_ps_process();
177 // Script-controlled service
178 bool start_success = start_ps_process(std::vector<std::string>(1, "start"));
179 if (! start_success) {
185 void ServiceRecord::started()
187 service_state = SVC_STARTED;
188 // TODO - inform listeners
190 if (desired_state == SVC_STARTED) {
191 // Start any dependents whose desired state is SVC_STARTED:
192 for (sr_iter i = dependents.begin(); i != dependents.end(); i++) {
193 if ((*i)->desired_state == SVC_STARTED) {
197 for (sr_iter i = soft_dependents.begin(); i != soft_dependents.end(); i++) {
198 if ((*i)->desired_state == SVC_STARTED) {
208 void ServiceRecord::failed_to_start()
210 service_state = SVC_STOPPED;
211 desired_state = SVC_STOPPED;
212 service_set->service_inactive(this);
214 // Cancel start of dependents:
215 for (sr_iter i = dependents.begin(); i != dependents.end(); i++) {
216 if ((*i)->desired_state == SVC_STARTED) {
217 (*i)->failed_dependency();
220 // What about soft dependents?
221 // TODO we should probably send them "start" rather than "failed_dependency",
222 // or add a parameter to failed_dependency which says whether the dependency
223 // was soft and change start handling as appropriate.
224 // For now just fail the startup:
225 for (sr_iter i = soft_dependents.begin(); i != soft_dependents.end(); i++) {
226 if ((*i)->desired_state == SVC_STARTED) {
227 (*i)->failed_dependency();
232 bool ServiceRecord::start_ps_process()
234 return start_ps_process(std::vector<std::string>());
238 bool ServiceRecord::start_ps_process(const std::vector<std::string> &pargs)
240 // In general, you can't tell whether fork/exec is successful. We use a pipe to communicate
241 // success/failure from the child to the parent. The pipe is set CLOEXEC so a successful
242 // exec closes the pipe, and the parent sees EOF. If the exec is unsuccessful, the errno
243 // is written to the pipe, and the parent can read it.
249 if (pipe2(pipefd, O_CLOEXEC)) {
254 // TODO make sure pipefd's are not 0/1/2 (STDIN/OUT/ERR) - if they are, dup them
255 // until they are not.
257 pid_t forkpid = fork();
267 ev_default_destroy(); // won't need that on this side, free up fds.
269 // Re-set stdin, stdout, stderr
270 close(0); close(1); close(2);
271 string logfile = this->logfile;
272 if (logfile.length() == 0) {
273 logfile = "/dev/null";
276 // TODO rethink this logic. If we open it at not-0, shouldn't we just dup it to 0?:
277 if (open("/dev/null", O_RDONLY) == 0) {
278 // stdin = 0. That's what we should have; proceed with opening
279 // stdout and stderr.
280 open(logfile.c_str(), O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
284 // Tokenize the command, and add additional arguments from pargs:
285 vector<string> progAndArgs = tokenize(program_name);
286 progAndArgs.insert(progAndArgs.end(), pargs.begin(), pargs.end());
288 const char * pname = progAndArgs[0].c_str();
289 const char ** args = new const char *[progAndArgs.size() + 1];
291 for (std::vector<std::string>::size_type i = 0; i < progAndArgs.size(); i++) {
292 args[i] = progAndArgs[i].c_str();
294 args[progAndArgs.size()] = nullptr;
296 execvp(pname, (char ** const) args);
298 // If we got here, the exec failed:
299 int exec_status = errno;
300 write(pipefd[1], &exec_status, sizeof(int));
304 // Parent process - we only reach here once the exec() above
305 // has succeeded, or _exit() above was called (because vfork()
306 // suspends the parent until either of those occurs).
308 close(pipefd[1]); // close the 'other end' fd
311 if (read(pipefd[0], &exec_status, sizeof(int)) == 0) {
312 // pipe closed; success
315 // Add a process listener so we can detect when the
317 ev_child_init(&child_listener, process_child_callback, pid, 0);
318 child_listener.data = this;
319 ev_child_start(ev_default_loop(EVFLAG_AUTO), &child_listener);
335 // Mark this and all dependent services as force-stopped.
336 void ServiceRecord::forceStop()
340 for (sr_iter i = dependents.begin(); i != dependents.end(); i++) {
343 // We don't want to force stop soft dependencies, however.
346 // A dependency of this service failed to start.
347 void ServiceRecord::failed_dependency()
349 desired_state = SVC_STOPPED;
351 // Presumably, we were starting. So now we're not.
352 service_state = SVC_STOPPED;
354 // Notify dependents of this service also
355 for (sr_iter i = dependents.begin(); i != dependents.end(); i++) {
356 if ((*i)->desired_state == SVC_STARTED) {
357 (*i)->failed_dependency();
360 for (sr_iter i = soft_dependents.begin(); i != soft_dependents.end(); i++) {
361 if ((*i)->desired_state == SVC_STARTED) {
362 (*i)->failed_dependency();
367 void ServiceRecord::dependentStopped()
369 if (service_state != SVC_STOPPED && (desired_state == SVC_STOPPED || force_stop)) {
370 // Check the other dependents before we stop.
371 if (stopCheckDependents()) {
377 void ServiceRecord::stop()
379 if ((service_state == SVC_STOPPING || service_state == SVC_STOPPED)
380 && desired_state == SVC_STARTED) {
381 // The service *was* stopped/stopping, but it was going to restart.
382 // Now, we'll cancel the restart.
383 // TODO inform listeners waiting for start of cancellation
386 if (desired_state == SVC_STOPPED) return;
388 desired_state = SVC_STOPPED;
390 if (service_state != SVC_STARTED) {
391 if (service_state == SVC_STARTING) {
392 // Well this is awkward: we're going to have to continue
393 // starting, but we don't want any dependents to think that
394 // they are still waiting to start.
395 // Make sure they remain stopped:
399 // If we're starting we need to wait for that to complete.
400 // If we're already stopping/stopped there's nothing to do.
404 // If we get here, we are in STARTED state; stop all dependents.
405 if (stopCheckDependents()) {
410 bool ServiceRecord::stopCheckDependents()
412 bool all_deps_stopped = true;
413 for (sr_iter i = dependents.begin(); i != dependents.end(); ++i) {
414 if ((*i)->service_state != SVC_STOPPED) {
415 all_deps_stopped = false;
420 return all_deps_stopped;
423 bool ServiceRecord::stopDependents()
425 bool all_deps_stopped = true;
426 for (sr_iter i = dependents.begin(); i != dependents.end(); ++i) {
427 if ((*i)->service_state != SVC_STOPPED) {
428 all_deps_stopped = false;
433 return all_deps_stopped;
438 // Dependency stopped or is stopping; we must stop too.
439 void ServiceRecord::stopping()
441 service_state = SVC_STOPPING;
443 if (service_type == SVC_PROCESS) {
445 // The process is still kicking on - must actually kill it.
447 // Now we wait; the rest is done in process_child_callback
450 // The process is already dead.
456 start_ps_process(std::vector<string>(1, "stop"));
460 void ServiceSet::service_active(ServiceRecord *sr)
465 void ServiceSet::service_inactive(ServiceRecord *sr)