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[tasks] Add support for explicit time parameter

pull/6892/head
Sebastian Law 4 years ago
committed by GitHub
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8b2241916a
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2 changed files with 215 additions and 32 deletions
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  1. 233
      discord/ext/tasks/__init__.py
  2. 14
      discord/utils.py

233
discord/ext/tasks/__init__.py
View File

@ -31,6 +31,7 @@ import logging
import sys
import traceback
from collections.abc import Sequence
from discord.backoff import ExponentialBackoff
log = logging.getLogger(__name__)
@ -39,17 +40,43 @@ __all__ = (
'loop',
)
class SleepHandle:
__slots__ = ('future', 'loop', 'handle')
def __init__(self, dt, *, loop):
self.loop = loop
self.future = future = loop.create_future()
relative_delta = discord.utils.compute_timedelta(dt)
self.handle = loop.call_later(relative_delta, future.set_result, True)
def recalculate(self, dt):
self.handle.cancel()
relative_delta = discord.utils.compute_timedelta(dt)
self.handle = self.loop.call_later(relative_delta, self.future.set_result, True)
def wait(self):
return self.future
def done(self):
return self.future.done()
def cancel(self):
self.handle.cancel()
self.future.cancel()
class Loop:
"""A background task helper that abstracts the loop and reconnection logic for you.
The main interface to create this is through :func:`loop`.
"""
def __init__(self, coro, seconds, hours, minutes, count, reconnect, loop):
def __init__(self, coro, seconds, hours, minutes, time, count, reconnect, loop):
self.coro = coro
self.reconnect = reconnect
self.loop = loop
self.count = count
self._current_loop = 0
self._handle = None
self._task = None
self._injected = None
self._valid_exception = (
@ -69,7 +96,7 @@ class Loop:
if self.count is not None and self.count <= 0:
raise ValueError('count must be greater than 0 or None.')
self.change_interval(seconds=seconds, minutes=minutes, hours=hours)
self.change_interval(seconds=seconds, minutes=minutes, hours=hours, time=time)
self._last_iteration_failed = False
self._last_iteration = None
self._next_iteration = None
@ -87,14 +114,23 @@ class Loop:
else:
await coro(*args, **kwargs)
def _try_sleep_until(self, dt):
self._handle = SleepHandle(dt=dt, loop=self.loop)
return self._handle.wait()
async def _loop(self, *args, **kwargs):
backoff = ExponentialBackoff()
await self._call_loop_function('before_loop')
sleep_until = discord.utils.sleep_until
self._last_iteration_failed = False
self._next_iteration = datetime.datetime.now(datetime.timezone.utc)
if self._time is not None:
# the time index should be prepared every time the internal loop is started
self._prepare_time_index()
self._next_iteration = self._get_next_sleep_time()
else:
self._next_iteration = datetime.datetime.now(datetime.timezone.utc)
try:
await asyncio.sleep(0) # allows canceling in before_loop
await self._try_sleep_until(self._next_iteration)
while True:
if not self._last_iteration_failed:
self._last_iteration = self._next_iteration
@ -102,22 +138,26 @@ class Loop:
try:
await self.coro(*args, **kwargs)
self._last_iteration_failed = False
now = datetime.datetime.now(datetime.timezone.utc)
if now > self._next_iteration:
self._next_iteration = now
except self._valid_exception:
self._last_iteration_failed = True
if not self.reconnect:
raise
await asyncio.sleep(backoff.delay())
else:
await sleep_until(self._next_iteration)
await self._try_sleep_until(self._next_iteration)
if self._stop_next_iteration:
return
now = datetime.datetime.now(datetime.timezone.utc)
if now > self._next_iteration:
self._prepare_time_index(now)
self._next_iteration = now
self._current_loop += 1
if self._current_loop == self.count:
break
except asyncio.CancelledError:
self._is_being_cancelled = True
raise
@ -127,6 +167,7 @@ class Loop:
raise exc
finally:
await self._call_loop_function('after_loop')
self._handle.cancel()
self._is_being_cancelled = False
self._current_loop = 0
self._stop_next_iteration = False
@ -136,8 +177,16 @@ class Loop:
if obj is None:
return self
copy = Loop(self.coro, seconds=self.seconds, hours=self.hours, minutes=self.minutes,
count=self.count, reconnect=self.reconnect, loop=self.loop)
copy = Loop(
self.coro,
seconds=self._seconds,
hours=self._hours,
minutes=self._minutes,
count=self.count,
time=self._time,
reconnect=self.reconnect,
loop=self.loop,
)
copy._injected = obj
copy._before_loop = self._before_loop
copy._after_loop = self._after_loop
@ -145,6 +194,43 @@ class Loop:
setattr(obj, self.coro.__name__, copy)
return copy
@property
def seconds(self):
"""Optional[:class:`float`]: Read-only value for the number of seconds
between each iteration. ``None`` if an explicit ``time`` value was passed instead.
.. versionadded:: 2.0
"""
return self._seconds
@property
def minutes(self):
"""Optional[:class:`float`]: Read-only value for the number of minutes
between each iteration. ``None`` if an explicit ``time`` value was passed instead.
.. versionadded:: 2.0
"""
return self._minutes
@property
def hours(self):
"""Optional[:class:`float`]: Read-only value for the number of hours
between each iteration. ``None`` if an explicit ``time`` value was passed instead.
.. versionadded:: 2.0
"""
return self._hours
@property
def time(self):
"""Optional[List[:class:`datetime.time`]]: Read-only list for the exact times this loop runs at.
``None`` if relative times were passed instead.
.. versionadded:: 2.0
"""
if self._time is not None:
return self._time.copy()
@property
def current_loop(self):
""":class:`int`: The current iteration of the loop."""
@ -430,16 +516,63 @@ class Loop:
return coro
def _get_next_sleep_time(self):
return self._last_iteration + datetime.timedelta(seconds=self._sleep)
def change_interval(self, *, seconds=0, minutes=0, hours=0):
if self._sleep is not None:
return self._last_iteration + datetime.timedelta(seconds=self._sleep)
if self._time_index >= len(self._time):
self._time_index = 0
if self._current_loop == 0:
# if we're at the last index on the first iteration, we need to sleep until tomorrow
return datetime.datetime.combine(datetime.datetime.now(datetime.timezone.utc) + datetime.timedelta(days=1), self._time[0])
next_time = self._time[self._time_index]
if self._current_loop == 0:
self._time_index += 1
return datetime.datetime.combine(datetime.datetime.now(datetime.timezone.utc), next_time)
next_date = self._last_iteration
if self._time_index == 0:
# we can assume that the earliest time should be scheduled for "tomorrow"
next_date += datetime.timedelta(days=1)
self._time_index += 1
return datetime.datetime.combine(next_date, next_time)
def _prepare_time_index(self, now=None):
# now kwarg should be a datetime.datetime representing the time "now"
# to calculate the next time index from
# pre-condition: self._time is set
time_now = (now or datetime.datetime.now(datetime.timezone.utc).replace(microsecond=0)).timetz()
for idx, time in enumerate(self._time):
if time >= time_now:
self._time_index = idx
break
else:
self._time_index = 0
def _get_time_parameter(self, time, *, inst=isinstance, dt=datetime.time, utc=datetime.timezone.utc):
if inst(time, dt):
ret = time if time.tzinfo is not None else time.replace(tzinfo=utc)
return [ret]
if not inst(time, Sequence):
raise TypeError(f'Expected datetime.time or a sequence of datetime.time for ``time``, received {type(time)!r} instead.')
if not time:
raise ValueError('time parameter must not be an empty sequence.')
ret = []
for index, t in enumerate(time):
if not inst(t, dt):
raise TypeError(f'Expected a sequence of {dt!r} for ``time``, received {type(t).__name__!r} at index {index} instead.')
ret.append(t if t.tzinfo is not None else t.replace(tzinfo=utc))
ret = sorted(set(ret)) # de-dupe and sort times
return ret
def change_interval(self, *, seconds=0, minutes=0, hours=0, time=None):
"""Changes the interval for the sleep time.
.. note::
This only applies on the next loop iteration. If it is desirable for the change of interval
to be applied right away, cancel the task with :meth:`cancel`.
.. versionadded:: 1.2
Parameters
@ -450,23 +583,54 @@ class Loop:
The number of minutes between every iteration.
hours: :class:`float`
The number of hours between every iteration.
time: Union[:class:`datetime.time`, Sequence[:class:`datetime.time`]]
The exact times to run this loop at. Either a non-empty list or a single
value of :class:`datetime.time` should be passed.
This cannot be used in conjunction with the relative time parameters.
.. versionadded:: 2.0
.. note::
Duplicate times will be ignored, and only run once.
Raises
-------
ValueError
An invalid value was given.
TypeError
An invalid value for the ``time`` parameter was passed, or the
``time`` parameter was passed in conjunction with relative time parameters.
"""
sleep = seconds + (minutes * 60.0) + (hours * 3600.0)
if sleep < 0:
raise ValueError('Total number of seconds cannot be less than zero.')
if time is None:
sleep = seconds + (minutes * 60.0) + (hours * 3600.0)
if sleep < 0:
raise ValueError('Total number of seconds cannot be less than zero.')
self._sleep = sleep
self._seconds = float(seconds)
self._hours = float(hours)
self._minutes = float(minutes)
self._time = None
else:
if any((seconds, minutes, hours)):
raise TypeError('Cannot mix explicit time with relative time')
self._time = self._get_time_parameter(time)
self._sleep = self._seconds = self._minutes = self._hours = None
if self.is_running():
if self._time is not None:
# prepare the next time index starting from after the last iteration
self._prepare_time_index(now=self._last_iteration)
self._next_iteration = self._get_next_sleep_time()
if not self._handle.done():
# the loop is sleeping, recalculate based on new interval
self._handle.recalculate(self._next_iteration)
self._sleep = sleep
self.seconds = seconds
self.hours = hours
self.minutes = minutes
def loop(*, seconds=0, minutes=0, hours=0, count=None, reconnect=True, loop=None):
def loop(*, seconds=0, minutes=0, hours=0, count=None, time=None, reconnect=True, loop=None):
"""A decorator that schedules a task in the background for you with
optional reconnect logic. The decorator returns a :class:`Loop`.
@ -478,6 +642,19 @@ def loop(*, seconds=0, minutes=0, hours=0, count=None, reconnect=True, loop=None
The number of minutes between every iteration.
hours: :class:`float`
The number of hours between every iteration.
time: Union[:class:`datetime.time`, Sequence[:class:`datetime.time`]]
The exact times to run this loop at. Either a non-empty list or a single
value of :class:`datetime.time` should be passed. Timezones are supported.
If no timezone is given for the times, it is assumed to represent UTC time.
This cannot be used in conjunction with the relative time parameters.
.. note::
Duplicate times will be ignored, and only run once.
.. versionadded:: 2.0
count: Optional[:class:`int`]
The number of loops to do, ``None`` if it should be an
infinite loop.
@ -494,7 +671,8 @@ def loop(*, seconds=0, minutes=0, hours=0, count=None, reconnect=True, loop=None
ValueError
An invalid value was given.
TypeError
The function was not a coroutine.
The function was not a coroutine, an invalid value for the ``time`` parameter was passed,
or ``time`` parameter was passed in conjunction with relative time parameters.
"""
def decorator(func):
kwargs = {
@ -502,6 +680,7 @@ def loop(*, seconds=0, minutes=0, hours=0, count=None, reconnect=True, loop=None
'minutes': minutes,
'hours': hours,
'count': count,
'time': time,
'reconnect': reconnect,
'loop': loop
}

14
discord/utils.py
View File

@ -503,6 +503,13 @@ async def sane_wait_for(futures, *, timeout):
return done
def compute_timedelta(dt: datetime.datetime):
if dt.tzinfo is None:
dt = dt.astimezone()
now = datetime.datetime.now(datetime.timezone.utc)
return max((dt - now).total_seconds(), 0)
async def sleep_until(when: datetime.datetime, result: Optional[T] = None) -> Optional[T]:
"""|coro|
@ -520,11 +527,8 @@ async def sleep_until(when: datetime.datetime, result: Optional[T] = None) -> Op
result: Any
If provided is returned to the caller when the coroutine completes.
"""
if when.tzinfo is None:
when = when.astimezone()
now = datetime.datetime.now(datetime.timezone.utc)
delta = (when - now).total_seconds()
return await asyncio.sleep(max(delta, 0), result)
delta = compute_timedelta(when)
return await asyncio.sleep(delta, result)
def utcnow() -> datetime.datetime:

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