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https://github.com/LonamiWebs/Telethon.git
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64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
import abc
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import functools
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from .filters import Filter
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class StopPropagation(Exception):
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"""
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If this exception is raised in any of the handlers for a given event,
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it will stop the execution of all other registered event handlers.
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It can be seen as the ``StopIteration`` in a for loop but for events.
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Example usage:
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>>> from telethon import TelegramClient, events
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>>> client = TelegramClient(...)
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>>>
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>>> @client.on(events.NewMessage)
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... async def delete(event):
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... await event.delete()
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... # No other event handler will have a chance to handle this event
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... raise StopPropagation
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...
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>>> @client.on(events.NewMessage)
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... async def _(event):
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... # Will never be reached, because it is the second handler
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... pass
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"""
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# For some reason Sphinx wants the silly >>> or
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# it will show warnings and look bad when generated.
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pass
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class EventBuilder(abc.ABC):
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@classmethod
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@abc.abstractmethod
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def _build(cls, client, update, entities):
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"""
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Builds an event for the given update if possible, or returns None.
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`entities` must have `get(Peer) -> User|Chat` and `self_id`,
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which must be the current user's ID.
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"""
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@functools.total_ordering
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class EventHandler:
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__slots__ = ('_event', '_callback', '_priority', '_filter')
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def __init__(self, event: EventBuilder, callback: callable, priority: int, filter: Filter):
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self._event = event
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self._callback = callback
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self._priority = priority
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self._filter = filter
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def __eq__(self, other):
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return self is other
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def __lt__(self, other):
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return self._priority < other._priority
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def __call__(self, *args, **kwargs):
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return self._callback(*args, **kwargs)
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