def lockTimeRemaining(self):
"""
returns the seconds the lock remains valid
"""
if self.lockedAt is not None:
timeoutPoint = pointOfTimeout()
if self.lockedAt > timeoutPoint:
#lock is valid
timeConsumed = (datetime.utcnow().replace(tzinfo=utc) - self.lockedAt)
LOCK_TIMEOUT = getattr(settings, 'LOCK_TIMEOUT', 1800)
delta = timedelta(seconds=LOCK_TIMEOUT)
remaining = delta - timeConsumed
remainingSeconds = remaining.total_seconds()
#calculate minutes, hours, seconds
hours, remainder = divmod(remainingSeconds, 3600)
minutes, seconds = divmod(remainder, 60)
if hours == 0 and minutes == 0:
timeRemaining = '%s seconds' % ("{0:.0f}".format(seconds))
elif hours == 0:
timeRemaining = '%s minutes and %s seconds' % ("{0:.0f}".format(minutes), "{0:.0f}".format(seconds))
else:
timeRemaining = '%s hours, %s minutes and %s seconds' % ("{0:.0f}".format(hours), "{0:.0f}".format(minutes), "{0:.0f}".format(seconds))
return timeRemaining
else:
#lock expired
return 0
else:
#no lock set
return 0
def checkLockStatus(self):
"""
Returns True if the lock is valid,
returns False if the lock has been expired or has not been set.
If lock has been expired method unlocks the lock and saves the
instance.
"""
if self.lockedAt is not None:
if self.lockedAt > pointOfTimeout():
#lock is still valid
return True
else:
#lock expired. unlock the lock
self.lockedAt = None
self.lockedBy = None
self.lockedFlag = False
self.save()
return False
return False
def get_query_set(self):
timeout = pointOfTimeout()
return super(LockedManager, self).get_query_set().filter(
lockedAt__gt=timeout,
lockedAt__isnull=False)
def get_query_set(self):
timeout = pointOfTimeout()
return super(UnlockedManager, self).get_query_set().filter(
Q(lockedAt__lte=timeout) |
Q(lockedAt__isnull=True))