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96 lines
3.7 KiB
Python
96 lines
3.7 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) 2015-2016
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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
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Dispatcher """
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from telegram.utils.deprecate import deprecate
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class Handler(object):
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"""
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The base class for all update handlers. You can create your own handlers
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by inheriting from this class.
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Args:
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callback (function): A function that takes ``bot, update`` as
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positional arguments. It will be called when the ``check_update``
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has determined that an update should be processed by this handler.
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pass_update_queue (optional[bool]): If set to ``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 ``Updater`` and ``Dispatcher`` that contains new updates which can
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be used to insert updates. Default is ``False``.
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pass_job_queue (optional[bool]): If set to ``True``, a keyword argument called
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``job_queue`` will be passed to the callback function. It will be a ``JobQueue``
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instance created by the ``Updater`` which can be used to schedule new jobs.
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Default is ``False``.
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"""
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def __init__(self, callback, pass_update_queue=False, pass_job_queue=False):
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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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def check_update(self, update):
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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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Args:
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update (object): The update to be tested
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Returns:
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bool
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"""
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raise NotImplementedError
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def handle_update(self, update, dispatcher):
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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. It should also be overridden, but in most
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cases call self.callback(dispatcher.bot, update), possibly along with
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optional arguments.
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Args:
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update (object): The update to be handled
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"""
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raise NotImplementedError
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def collect_optional_args(self, dispatcher):
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"""
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Prepares the optional arguments that are the same for all types of
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handlers
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Args:
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dispatcher (Dispatcher):
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"""
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optional_args = dict()
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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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return optional_args
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# old non-PEP8 Handler methods
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m = "telegram.Handler."
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checkUpdate = deprecate(check_update, m + "checkUpdate", m + "check_update")
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handleUpdate = deprecate(handle_update, m + "handleUpdate", m + "handle_update")
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collectOptionalArgs = deprecate(collect_optional_args, m + "collectOptionalArgs",
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m + "collect_optional_args")
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