def start(self):
"""
Start elric master. Select all due jobs from jobstore and enqueue them into redis queue.
Then update due jobs' information into jobstore.
:return:
"""
if self.running:
raise AlreadyRunningException
self._stopped = False
self.log.debug('eric master start...')
while True:
now = datetime.now(self.timezone)
wait_seconds = None
with self.jobstore_lock:
for job_id, job_key, serialized_job in self.jobstore.get_due_jobs(now):
# enqueue due job into redis queue
self._enqueue_job(job_key, serialized_job)
# update job's information, such as next_run_time
job_in_dict = Job.deserialize_to_dict(serialized_job)
last_run_time = Job.get_serial_run_times(job_in_dict, now)
if last_run_time:
next_run_time = Job.get_next_trigger_time(job_in_dict, last_run_time[-1])
if next_run_time:
job_in_dict['next_run_time'] = next_run_time
self.update_job(job_id, job_key, next_run_time, Job.dict_to_serialization(job_in_dict))
else:
# if job has no next run time, then remove it from jobstore
self.remove_job(job_id=job_id)
# get next closet run time job from jobstore and set it to be wake up time
closest_run_time = self.jobstore.get_closest_run_time()
if closest_run_time is not None:
wait_seconds = max(timedelta_seconds(closest_run_time - now), 0)
self.log.debug('Next wakeup is due at %s (in %f seconds)' % (closest_run_time, wait_seconds))
self._event.wait(wait_seconds if wait_seconds is not None else self.MAX_WAIT_TIME)
self._event.clear()
