/*
* This is a post- fix recursive function for starting every service
* that s depends on before starting s.
* @param s A Service_T object
*/
static void do_start(Service_T s) {
ASSERT(s);
if (s->visited)
return;
s->visited = TRUE;
if (s->dependantlist) {
Dependant_T d;
for (d = s->dependantlist; d; d = d->next ) {
Service_T parent = Util_getService(d->dependant);
ASSERT(parent);
do_start(parent);
}
}
if (s->start && (s->type!=TYPE_PROCESS || !Util_isProcessRunning(s))) {
LogInfo("'%s' start: %s\n", s->name, s->start->arg[0]);
spawn(s, s->start, NULL);
/* We only wait for a process type, other service types does not have a pid file to watch */
if (s->type == TYPE_PROCESS)
wait_start(s);
}
Util_monitorSet(s);
}
/*
* This function simply restarts the service s.
* @param s A Service_T object
*/
static void do_restart(Service_T s) {
if (s->restart) {
LogInfo("'%s' restart: %s\n", s->name, s->restart->arg[0]);
spawn(s, s->restart, NULL);
/* We only wait for a process type, other service types does not have a pid file to watch */
if (s->type == TYPE_PROCESS)
wait_process(s, Process_Started);
} else {
LogDebug("'%s' restart skipped -- method not defined\n", s->name);
}
Util_monitorSet(s);
}
/*
* This is a post- fix recursive function for enabling monitoring every service
* that s depends on before monitor s.
* @param s A Service_T object
* @param flag A Custom flag
*/
static void do_monitor(Service_T s, int flag) {
ASSERT(s);
if (s->visited)
return;
s->visited = TRUE;
if (s->dependantlist) {
Dependant_T d;
for (d = s->dependantlist; d; d = d->next ) {
Service_T parent = Util_getService(d->dependant);
ASSERT(parent);
do_monitor(parent, flag);
}
}
Util_monitorSet(s);
}
/**
* Check to see if we should try to start/stop service
* @param S A service name as stated in the config file
* @param A An action id describing the action to execute
* @return FALSE for error, otherwise TRUE
*/
int control_service(const char *S, int A) {
Service_T s = NULL;
ASSERT(S);
if (! (s = Util_getService(S))) {
LogError("%s: service '%s' -- doesn't exist\n", prog, S);
return FALSE;
}
switch(A) {
case ACTION_START:
if (s->type == TYPE_PROCESS) {
if (Util_isProcessRunning(s)) {
DEBUG("%s: Process already running -- process %s\n", prog, S);
Util_monitorSet(s);
return TRUE;
}
if (!s->start) {
LogError("%s: Start method not defined -- process %s\n", prog, S);
Util_monitorSet(s);
return FALSE;
}
}
do_depend(s, ACTION_STOP);
do_start(s);
do_depend(s, ACTION_START);
break;
case ACTION_STOP:
if (s->type == TYPE_PROCESS && !s->stop) {
LogError("%s: Stop method not defined -- process %s\n", prog, S);
Util_monitorUnset(s);
return FALSE;
}
/* soft unmonitor and stop: */
do_depend(s, ACTION_STOP);
do_stop(s);
/* hard unmonitor - will reset all counters and flags: */
do_depend(s, ACTION_UNMONITOR);
do_unmonitor(s);
break;
case ACTION_RESTART:
if (s->type == TYPE_PROCESS && (!s->start || !s->stop)) {
LogError("%s: Start or stop method not defined -- process %s\n", prog, S);
Util_monitorSet(s);
return FALSE;
}
LogInfo("'%s' trying to restart\n", s->name);
do_depend(s, ACTION_STOP);
if (do_stop(s)) {
/* Only start if stop succeeded */
do_start(s);
do_depend(s, ACTION_START);
} else {
/* enable monitoring of this service again to allow the restart retry
* in the next cycle up to timeout limit */
Util_monitorSet(s);
}
break;
case ACTION_MONITOR:
/* We only enable monitoring of this service and all prerequisite
* services. Chain of services which depends on this service keep
* its state */
do_monitor(s);
break;
case ACTION_UNMONITOR:
/* We disable monitoring of this service and all services which
* depends on it */
do_depend(s, ACTION_UNMONITOR);
do_unmonitor(s);
break;
default:
LogError("%s: service '%s' -- invalid action %s\n", prog, S, A);
return FALSE;
}
return TRUE;
}
