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260 lines
11 KiB
Python
260 lines
11 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) 2015-2021
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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 base class for handlers as used by the Dispatcher."""
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from abc import ABC, abstractmethod
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from typing import TYPE_CHECKING, Any, Callable, Dict, Optional, TypeVar, Union, Generic
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from sys import version_info as py_ver
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from telegram.utils.deprecate import set_new_attribute_deprecated
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from telegram import Update
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from telegram.ext.utils.promise import Promise
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from telegram.utils.helpers import DefaultValue, DEFAULT_FALSE
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from telegram.ext.utils.types import CCT
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if TYPE_CHECKING:
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from telegram.ext import Dispatcher
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RT = TypeVar('RT')
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UT = TypeVar('UT')
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class Handler(Generic[UT, CCT], ABC):
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"""The base class for all update handlers. Create custom handlers by inheriting from it.
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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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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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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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Defaults to :obj:`False`.
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Attributes:
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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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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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"""
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# Apparently Py 3.7 and below have '__dict__' in ABC
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if py_ver < (3, 7):
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__slots__ = (
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'callback',
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'pass_update_queue',
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'pass_job_queue',
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'pass_user_data',
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'pass_chat_data',
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'run_async',
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)
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else:
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__slots__ = (
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'callback', # type: ignore[assignment]
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'pass_update_queue',
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'pass_job_queue',
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'pass_user_data',
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'pass_chat_data',
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'run_async',
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'__dict__',
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)
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def __init__(
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self,
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callback: Callable[[UT, CCT], 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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run_async: Union[bool, DefaultValue] = DEFAULT_FALSE,
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):
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self.callback = callback
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self.pass_update_queue = pass_update_queue
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self.pass_job_queue = pass_job_queue
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self.pass_user_data = pass_user_data
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self.pass_chat_data = pass_chat_data
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self.run_async = run_async
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def __setattr__(self, key: str, value: object) -> None:
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# See comment on BaseFilter to know why this was done.
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if key.startswith('__'):
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key = f"_{self.__class__.__name__}{key}"
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if issubclass(self.__class__, Handler) and not self.__class__.__module__.startswith(
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'telegram.ext.'
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):
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object.__setattr__(self, key, value)
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return
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set_new_attribute_deprecated(self, key, value)
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@abstractmethod
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def check_update(self, update: object) -> Optional[Union[bool, object]]:
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"""
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This method is called to determine if an update should be handled by
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this handler instance. It should always be overridden.
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Note:
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Custom updates types can be handled by the dispatcher. Therefore, an implementation of
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this method should always check the type of :attr:`update`.
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Args:
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update (:obj:`str` | :class:`telegram.Update`): The update to be tested.
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Returns:
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Either :obj:`None` or :obj:`False` if the update should not be handled. Otherwise an
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object that will be passed to :meth:`handle_update` and
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:meth:`collect_additional_context` when the update gets handled.
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"""
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def handle_update(
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self,
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update: UT,
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dispatcher: 'Dispatcher',
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check_result: object,
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context: CCT = None,
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) -> Union[RT, Promise]:
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"""
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This method is called if it was determined that an update should indeed
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be handled by this instance. Calls :attr:`callback` along with its respectful
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arguments. To work with the :class:`telegram.ext.ConversationHandler`, this method
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returns the value returned from :attr:`callback`.
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Note that it can be overridden if needed by the subclassing handler.
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Args:
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update (:obj:`str` | :class:`telegram.Update`): The update to be handled.
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dispatcher (:class:`telegram.ext.Dispatcher`): The calling dispatcher.
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check_result (:obj:`obj`): The result from :attr:`check_update`.
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context (:class:`telegram.ext.CallbackContext`, optional): The context as provided by
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the dispatcher.
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"""
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run_async = self.run_async
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if (
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self.run_async is DEFAULT_FALSE
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and dispatcher.bot.defaults
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and dispatcher.bot.defaults.run_async
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):
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run_async = True
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if context:
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self.collect_additional_context(context, update, dispatcher, check_result)
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if run_async:
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return dispatcher.run_async(self.callback, update, context, update=update)
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return self.callback(update, context)
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optional_args = self.collect_optional_args(dispatcher, update, check_result)
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if run_async:
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return dispatcher.run_async(
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self.callback, dispatcher.bot, update, update=update, **optional_args
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)
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return self.callback(dispatcher.bot, update, **optional_args) # type: ignore
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def collect_additional_context(
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self,
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context: CCT,
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update: UT,
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dispatcher: 'Dispatcher',
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check_result: Any,
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) -> None:
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"""Prepares additional arguments for the context. Override if needed.
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Args:
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context (:class:`telegram.ext.CallbackContext`): The context object.
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update (:class:`telegram.Update`): The update to gather chat/user id from.
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dispatcher (:class:`telegram.ext.Dispatcher`): The calling dispatcher.
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check_result: The result (return value) from :attr:`check_update`.
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"""
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def collect_optional_args(
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self,
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dispatcher: 'Dispatcher',
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update: UT = None,
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check_result: Any = None, # pylint: disable=W0613
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) -> Dict[str, object]:
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"""
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Prepares the optional arguments. If the handler has additional optional args,
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it should subclass this method, but remember to call this super method.
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DEPRECATED: This method is being replaced by new context based callbacks. Please see
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https://git.io/fxJuV for more info.
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Args:
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dispatcher (:class:`telegram.ext.Dispatcher`): The dispatcher.
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update (:class:`telegram.Update`): The update to gather chat/user id from.
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check_result: The result from check_update
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"""
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optional_args: Dict[str, object] = {}
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if self.pass_update_queue:
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optional_args['update_queue'] = dispatcher.update_queue
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if self.pass_job_queue:
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optional_args['job_queue'] = dispatcher.job_queue
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if self.pass_user_data and isinstance(update, Update):
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user = update.effective_user
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optional_args['user_data'] = dispatcher.user_data[
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user.id if user else None # type: ignore[index]
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]
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if self.pass_chat_data and isinstance(update, Update):
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chat = update.effective_chat
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optional_args['chat_data'] = dispatcher.chat_data[
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chat.id if chat else None # type: ignore[index]
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]
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return optional_args
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