def scheduler_loop(self, interval=60):
now = datetime.now()
while not self.stopped():
event_schedules = get_relevant_schedules(now)
for schedule in event_schedules:
try:
# call the callback function
# possibly passing in args and kwargs
schedule.run(self._router)
except Exception, e:
# Don't prevent exceptions from killing the thread
exc_type, exc_value, exc_traceback = sys.exc_info()
stacktrace = traceback.extract_tb(exc_traceback)
self._router.error("Problem in scheduler for: %s. %s\n\nTRACEBACK: %s" % (schedule,
e.message,
stacktrace))
if self._speedup is not None: # debugging/testing only!
now = now + self._speedup
time.sleep(1)
else:
next_run = now + timedelta(seconds=interval)
updated_now = datetime.now()
while updated_now < next_run:
# we add another second since system time runs at microsecond accuracy
# whereas python time is only second accuracy
time.sleep((next_run - updated_now + timedelta(seconds=1)).seconds)
updated_now = datetime.now()
now = next_run
def scheduler_heartbeat():
"""
Check all scheduled tasks and run whatever is necessary.
"""
# this should get called every minute by celery
failures = []
currtime = datetime.utcnow()
relevant = get_relevant_schedules(currtime)
for schedule in relevant:
try:
# call the callback function
# possibly passing in args and kwargs
schedule.run(currtime)
except Exception, e:
# Don't prevent exceptions from killing the rest
logging.exception("Problem in the scheduler heartbeat for %s" % schedule)
failures.append(e)
