python-telegram-bot/telegram/ext/handler.py

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#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2016
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program. If not, see [http://www.gnu.org/licenses/].
""" This module contains the base class for handlers as used by the
Dispatcher """
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from telegram.utils.deprecate import deprecate
class Handler(object):
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"""
The base class for all update handlers. You can create your own handlers
by inheriting from this class.
Args:
callback (function): A function that takes ``bot, update`` as
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.
pass_update_queue (optional[bool]): If set to ``True``, a keyword argument called
``update_queue`` will be passed to the callback function. It will be the ``Queue``
instance used by the ``Updater`` and ``Dispatcher`` that contains new updates which can
be used to insert updates. Default is ``False``.
pass_job_queue (optional[bool]): If set to ``True``, a keyword argument called
``job_queue`` will be passed to the callback function. It will be a ``JobQueue``
instance created by the ``Updater`` which can be used to schedule new jobs.
Default is ``False``.
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"""
def __init__(self, callback, pass_update_queue=False, pass_job_queue=False):
self.callback = callback
self.pass_update_queue = pass_update_queue
self.pass_job_queue = pass_job_queue
def check_update(self, update):
"""
This method is called to determine if an update should be handled by
this handler instance. It should always be overridden.
Args:
update (object): The update to be tested
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Returns:
bool
"""
raise NotImplementedError
def handle_update(self, update, dispatcher):
"""
This method is called if it was determined that an update should indeed
be handled by this instance. It should also be overridden, but in most
cases call ``self.callback(dispatcher.bot, update)``, possibly along with
optional arguments. To work with the ``ConversationHandler``, this method should return the
value returned from ``self.callback``
Args:
update (object): The update to be handled
dispatcher (Dispatcher): The dispatcher to collect optional args
"""
raise NotImplementedError
def collect_optional_args(self, dispatcher):
"""
Prepares the optional arguments that are the same for all types of
handlers
Args:
dispatcher (Dispatcher):
"""
optional_args = dict()
if self.pass_update_queue:
optional_args['update_queue'] = dispatcher.update_queue
if self.pass_job_queue:
optional_args['job_queue'] = dispatcher.job_queue
return optional_args
# old non-PEP8 Handler methods
m = "telegram.Handler."
checkUpdate = deprecate(check_update, m + "checkUpdate", m + "check_update")
handleUpdate = deprecate(handle_update, m + "handleUpdate", m + "handle_update")
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collectOptionalArgs = deprecate(collect_optional_args, m + "collectOptionalArgs",
m + "collect_optional_args")