mirror of
https://github.com/morpheus65535/bazarr.git
synced 2024-11-15 04:04:42 +08:00
49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
|
from abc import ABCMeta, abstractmethod
|
||
|
|
from datetime import timedelta
|
||
|
|
import random
|
||
|
|
|
||
|
|
import six
|
||
|
|
|
||
|
|
|
||
|
|
class BaseTrigger(six.with_metaclass(ABCMeta)):
|
||
|
|
"""Abstract base class that defines the interface that every trigger must implement."""
|
||
|
|
|
||
|
|
__slots__ = ()
|
||
|
|
|
||
|
|
@abstractmethod
|
||
|
|
def get_next_fire_time(self, previous_fire_time, now):
|
||
|
|
"""
|
||
|
|
Returns the next datetime to fire on, If no such datetime can be calculated, returns
|
||
|
|
``None``.
|
||
|
|
|
||
|
|
:param datetime.datetime previous_fire_time: the previous time the trigger was fired
|
||
|
|
:param datetime.datetime now: current datetime
|
||
|
|
"""
|
||
|
|
|
||
|
|
def _apply_jitter(self, next_fire_time, jitter, now):
|
||
|
|
"""
|
||
|
|
Randomize ``next_fire_time`` by adding or subtracting a random value (the jitter). If the
|
||
|
|
resulting datetime is in the past, returns the initial ``next_fire_time`` without jitter.
|
||
|
|
|
||
|
|
``next_fire_time - jitter <= result <= next_fire_time + jitter``
|
||
|
|
|
||
|
|
:param datetime.datetime|None next_fire_time: next fire time without jitter applied. If
|
||
|
|
``None``, returns ``None``.
|
||
|
|
:param int|None jitter: maximum number of seconds to add or subtract to
|
||
|
|
``next_fire_time``. If ``None`` or ``0``, returns ``next_fire_time``
|
||
|
|
:param datetime.datetime now: current datetime
|
||
|
|
:return datetime.datetime|None: next fire time with a jitter.
|
||
|
|
"""
|
||
|
|
if next_fire_time is None or not jitter:
|
||
|
|
return next_fire_time
|
||
|
|
|
||
|
|
next_fire_time_with_jitter = next_fire_time + timedelta(
|
||
|
|
seconds=random.uniform(-jitter, jitter))
|
||
|
|
|
||
|
|
if next_fire_time_with_jitter < now:
|
||
|
|
# Next fire time with jitter is in the past.
|
||
|
|
# Ignore jitter to avoid false misfire.
|
||
|
|
return next_fire_time
|
||
|
|
|
||
|
|
return next_fire_time_with_jitter
|