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

65 lines
2.1 KiB
Python

#!/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 """
class Handler(object):
def __init__(self, callback, pass_update_queue=False):
self.callback = callback
self.pass_update_queue = pass_update_queue
def checkUpdate(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
"""
raise NotImplementedError
def handleUpdate(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.
Args:
update (object): The update to be handled
"""
raise NotImplementedError
def collectOptionalArgs(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
return optional_args