mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-27 03:43:45 +03:00
140 lines
4.2 KiB
Python
140 lines
4.2 KiB
Python
from .raw import Raw
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from .chataction import ChatAction
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from .messagedeleted import MessageDeleted
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from .messageedited import MessageEdited
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from .messageread import MessageRead
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from .newmessage import NewMessage
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from .userupdate import UserUpdate
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from .callbackquery import CallbackQuery
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from .inlinequery import InlineQuery
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_HANDLERS_ATTRIBUTE = '__tl.handlers'
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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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def register(event=None):
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"""
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Decorator method to *register* event handlers. This is the client-less
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`add_event_handler
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<telethon.client.updates.UpdateMethods.add_event_handler>` variant.
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Note that this method only registers callbacks as handlers,
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and does not attach them to any client. This is useful for
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external modules that don't have access to the client, but
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still want to define themselves as a handler. Example:
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>>> from telethon import events
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>>> @events.register(events.NewMessage)
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... async def handler(event):
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... ...
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...
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>>> # (somewhere else)
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...
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>>> from telethon import TelegramClient
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>>> client = TelegramClient(...)
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>>> client.add_event_handler(handler)
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Remember that you can use this as a non-decorator
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through ``register(event)(callback)``.
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Args:
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event (`_EventBuilder` | `type`):
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The event builder class or instance to be used,
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for instance ``events.NewMessage``.
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"""
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if isinstance(event, type):
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event = event()
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elif not event:
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event = Raw()
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def decorator(callback):
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handlers = getattr(callback, _HANDLERS_ATTRIBUTE, [])
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handlers.append(event)
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setattr(callback, _HANDLERS_ATTRIBUTE, handlers)
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return callback
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return decorator
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def unregister(callback, event=None):
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"""
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Inverse operation of `register` (though not a decorator). Client-less
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`remove_event_handler
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<telethon.client.updates.UpdateMethods.remove_event_handler>`
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variant. **Note that this won't remove handlers from the client**,
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because it simply can't, so you would generally use this before
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adding the handlers to the client.
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This method is here for symmetry. You will rarely need to
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unregister events, since you can simply just not add them
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to any client.
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If no event is given, all events for this callback are removed.
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Returns how many callbacks were removed.
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"""
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found = 0
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if event and not isinstance(event, type):
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event = type(event)
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handlers = getattr(callback, _HANDLERS_ATTRIBUTE, [])
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handlers.append((event, callback))
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i = len(handlers)
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while i:
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i -= 1
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ev = handlers[i]
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if not event or isinstance(ev, event):
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del handlers[i]
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found += 1
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return found
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def is_handler(callback):
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"""
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Returns ``True`` if the given callback is an
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event handler (i.e. you used `register` on it).
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"""
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return hasattr(callback, _HANDLERS_ATTRIBUTE)
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def list(callback):
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"""
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Returns a list containing the registered event
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builders inside the specified callback handler.
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"""
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return getattr(callback, _HANDLERS_ATTRIBUTE, [])[:]
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def _get_handlers(callback):
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"""
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Like ``list`` but returns ``None`` if the callback was never registered.
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"""
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return getattr(callback, _HANDLERS_ATTRIBUTE, None)
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