def start(self):
""" reading box configurations and starting timers to start/monitor/kill processes """
try:
box_configuration = helper.retrieve_configuration(self.logger, self.box_id)
process_list = box_configuration.get_process_list()
for process in process_list:
params = [process]
handler = RepeatTimer(INTERVAL, self.manage_process, args=params)
self.thread_handlers[process] = handler
handler.start()
self.logger.info('Started Supervisor for %s, triggering every %d seconds' % (process, INTERVAL))
except LookupError as e:
self.logger.error('Supervisor failed to start because of: %r' % e)
def manage_process(self, *args):
""" reads box configuration and start/kill processes. performs process monitoring """
process_name = args[0]
try:
self.lock.acquire()
box_configuration = helper.retrieve_configuration(self.logger, self.box_id)
state = box_configuration.get_process_state(process_name)
pid = box_configuration.get_process_pid(process_name)
if state == BoxConfigurationEntry.STATE_OFF:
if pid is not None:
self._kill_process(box_configuration, process_name)
return
if pid is None or not psutil.pid_exists(int(pid)):
self._start_process(box_configuration, process_name)
elif pid is not None and psutil.pid_exists(int(pid)):
self._poll_process(box_configuration, process_name)
except Exception as e:
self.logger.error('Exception: %s' % str(e), exc_info=True)
finally:
self.lock.release()
