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105 lines
4.5 KiB
Python
105 lines
4.5 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2020
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains the TypeHandler class."""
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from .handler import Handler
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from typing import Callable, TYPE_CHECKING, TypeVar, Type, Any
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if TYPE_CHECKING:
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from telegram.ext import CallbackContext
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RT = TypeVar('RT')
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class TypeHandler(Handler):
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"""Handler class to handle updates of custom types.
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Attributes:
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type (:obj:`type`): The ``type`` of updates this handler should process.
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callback (:obj:`callable`): The callback function for this handler.
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strict (:obj:`bool`): Use ``type`` instead of ``isinstance``. Default is :obj:`False`.
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pass_update_queue (:obj:`bool`): Determines whether ``update_queue`` will be
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passed to the callback function.
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pass_job_queue (:obj:`bool`): Determines whether ``job_queue`` will be passed to
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the callback function.
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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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Warning:
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When setting ``run_async`` to :obj:`True`, you cannot rely on adding custom
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attributes to :class:`telegram.ext.CallbackContext`. See its docs for more info.
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Args:
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type (:obj:`type`): The ``type`` of updates this handler should process, as
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determined by ``isinstance``
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callback (:obj:`callable`): The callback function for this handler. Will be called when
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:attr:`check_update` has determined that an update should be processed by this handler.
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Callback signature for context based API:
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``def callback(update: Update, context: CallbackContext)``
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The return value of the callback is usually ignored except for the special case of
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:class:`telegram.ext.ConversationHandler`.
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strict (:obj:`bool`, optional): Use ``type`` instead of ``isinstance``.
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Default is :obj:`False`
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pass_update_queue (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
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``update_queue`` will be passed to the callback function. It will be the ``Queue``
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instance used by the :class:`telegram.ext.Updater` and :class:`telegram.ext.Dispatcher`
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that contains new updates which can be used to insert updates. Default is :obj:`False`.
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DEPRECATED: Please switch to context based callbacks.
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pass_job_queue (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
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``job_queue`` will be passed to the callback function. It will be a
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:class:`telegram.ext.JobQueue` instance created by the :class:`telegram.ext.Updater`
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which can be used to schedule new jobs. Default is :obj:`False`.
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DEPRECATED: Please switch to context based callbacks.
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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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Defaults to :obj:`False`.
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"""
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def __init__(self,
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type: Type,
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callback: Callable[[Any, 'CallbackContext'], RT],
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strict: bool = False,
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pass_update_queue: bool = False,
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pass_job_queue: bool = False,
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run_async: bool = False):
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super().__init__(
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callback,
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pass_update_queue=pass_update_queue,
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pass_job_queue=pass_job_queue,
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run_async=run_async)
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self.type = type
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self.strict = strict
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def check_update(self, update: Any) -> bool:
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"""Determines whether an update should be passed to this handlers :attr:`callback`.
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Args:
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update (:class:`telegram.Update`): Incoming telegram update.
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Returns:
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:obj:`bool`
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"""
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if not self.strict:
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return isinstance(update, self.type)
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else:
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return type(update) is self.type
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