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77a8c64f6c
* Improve typing & docs of handlers * Apply suggestions from code review Co-authored-by: Poolitzer <25934244+Poolitzer@users.noreply.github.com> Co-authored-by: Poolitzer <25934244+Poolitzer@users.noreply.github.com>
204 lines
9.4 KiB
Python
204 lines
9.4 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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# TODO: Remove allow_edited
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"""This module contains the MessageHandler class."""
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import warnings
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from typing import TYPE_CHECKING, Any, Callable, Dict, Optional, TypeVar, Union
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from telegram import Update
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from telegram.ext import BaseFilter, Filters
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from telegram.utils.deprecate import TelegramDeprecationWarning
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from telegram.utils.helpers import DefaultValue, DEFAULT_FALSE
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from .handler import Handler
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if TYPE_CHECKING:
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from telegram.ext import CallbackContext, Dispatcher
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RT = TypeVar('RT')
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class MessageHandler(Handler[Update]):
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"""Handler class to handle telegram messages. They might contain text, media or status updates.
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Attributes:
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filters (:obj:`Filter`): Only allow updates with these Filters. See
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:mod:`telegram.ext.filters` for a full list of all available filters.
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callback (:obj:`callable`): The callback function for this handler.
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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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pass_user_data (:obj:`bool`): Determines whether ``user_data`` will be passed to
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the callback function.
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pass_chat_data (:obj:`bool`): Determines whether ``chat_data`` will be passed to
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the callback function.
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message_updates (:obj:`bool`): Should "normal" message updates be handled?
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Default is :obj:`None`.
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channel_post_updates (:obj:`bool`): Should channel posts updates be handled?
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Default is :obj:`None`.
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edited_updates (:obj:`bool`): Should "edited" message updates be handled?
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Default is :obj:`None`.
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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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Note:
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:attr:`pass_user_data` and :attr:`pass_chat_data` determine whether a ``dict`` you
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can use to keep any data in will be sent to the :attr:`callback` function. Related to
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either the user or the chat that the update was sent in. For each update from the same user
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or in the same chat, it will be the same ``dict``.
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Note that this is DEPRECATED, and you should use context based callbacks. See
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https://git.io/fxJuV for more info.
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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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filters (:class:`telegram.ext.BaseFilter`, optional): A filter inheriting from
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:class:`telegram.ext.filters.BaseFilter`. Standard filters can be found in
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:class:`telegram.ext.filters.Filters`. Filters can be combined using bitwise
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operators (& for and, | for or, ~ for not). Default is
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:attr:`telegram.ext.filters.Filters.update`. This defaults to all message_type updates
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being: ``message``, ``edited_message``, ``channel_post`` and ``edited_channel_post``.
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If you don't want or need any of those pass ``~Filters.update.*`` in the filter
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argument.
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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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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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pass_user_data (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
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``user_data`` will be passed to the callback function. Default is :obj:`False`.
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DEPRECATED: Please switch to context based callbacks.
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pass_chat_data (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
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``chat_data`` will be passed to the callback function. Default is :obj:`False`.
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DEPRECATED: Please switch to context based callbacks.
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message_updates (:obj:`bool`, optional): Should "normal" message updates be handled?
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Default is :obj:`None`.
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DEPRECATED: Please switch to filters for update filtering.
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channel_post_updates (:obj:`bool`, optional): Should channel posts updates be handled?
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Default is :obj:`None`.
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DEPRECATED: Please switch to filters for update filtering.
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edited_updates (:obj:`bool`, optional): Should "edited" message updates be handled? Default
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is :obj:`None`.
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DEPRECATED: Please switch to filters for update filtering.
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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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Raises:
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ValueError
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"""
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def __init__(
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self,
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filters: BaseFilter,
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callback: Callable[[Update, 'CallbackContext'], RT],
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pass_update_queue: bool = False,
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pass_job_queue: bool = False,
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pass_user_data: bool = False,
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pass_chat_data: bool = False,
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message_updates: bool = None,
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channel_post_updates: bool = None,
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edited_updates: bool = None,
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run_async: Union[bool, DefaultValue] = DEFAULT_FALSE,
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):
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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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pass_user_data=pass_user_data,
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pass_chat_data=pass_chat_data,
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run_async=run_async,
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)
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if message_updates is False and channel_post_updates is False and edited_updates is False:
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raise ValueError(
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'message_updates, channel_post_updates and edited_updates are all False'
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)
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if filters is not None:
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self.filters = Filters.update & filters
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else:
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self.filters = Filters.update
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if message_updates is not None:
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warnings.warn(
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'message_updates is deprecated. See https://git.io/fxJuV for more info',
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TelegramDeprecationWarning,
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stacklevel=2,
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)
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if message_updates is False:
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self.filters &= ~Filters.update.message
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if channel_post_updates is not None:
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warnings.warn(
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'channel_post_updates is deprecated. See https://git.io/fxJuV ' 'for more info',
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TelegramDeprecationWarning,
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stacklevel=2,
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)
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if channel_post_updates is False:
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self.filters &= ~Filters.update.channel_post
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if edited_updates is not None:
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warnings.warn(
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'edited_updates is deprecated. See https://git.io/fxJuV for more info',
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TelegramDeprecationWarning,
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stacklevel=2,
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)
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if edited_updates is False:
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self.filters &= ~(
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Filters.update.edited_message | Filters.update.edited_channel_post
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)
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def check_update(self, update: Any) -> Optional[Union[bool, Dict[str, Any]]]:
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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` | :obj:`object`): Incoming update.
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Returns:
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:obj:`bool`
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"""
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if isinstance(update, Update) and update.effective_message:
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return self.filters(update)
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return None
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def collect_additional_context(
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self,
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context: 'CallbackContext',
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update: Update,
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dispatcher: 'Dispatcher',
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check_result: Optional[Union[bool, Dict[str, Any]]],
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) -> None:
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if isinstance(check_result, dict):
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context.update(check_result)
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