calendar-social/calsocial/app_state.py
Gergely Polonkai 4b1fff6544 Add the AppState model
This allows setting application state during run time
2018-07-25 20:27:13 +02:00

61 lines
1.8 KiB
Python

# Calendar.social
# Copyright (C) 2018 Gergely Polonkai
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
"""Metaclass for storing and accessing app state
"""
def get_state_base(self, key):
"""Method to get a key from the state store
"""
return self.__get_state__(key)
def set_state_base(self, key, value):
"""Method to set a key/value in the state store
"""
self.__set_state__(key, str(value))
def set_default_base(self, key, value):
"""Method to set the default value of a key in the state store
If key is already in the state store, this method is a no-op.
"""
self.__set_state_default__(key, str(value))
def app_state_base(klass):
"""Base class creator for AppStateMeta types
:param klass: the class to extend
:type klass: type
:returns: a new class extending ``klass``
:rtype: type
"""
# Construct the meta class based on the metaclass of ``klass``
metaclass = type(
klass.__name__ + 'BaseMeta',
(type(klass),),
{
'__getitem__': get_state_base,
'__setitem__': set_state_base,
'setdefault': set_default_base,
})
return metaclass(klass.__name__ + 'Base', (klass,), {'__abstract__': True})