# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""Greenthread local storage of variables using weak references"""

import weakref

from eventlet import corolocal


class WeakLocal(corolocal.local):
    def __getattribute__(self, attr):
        rval = corolocal.local.__getattribute__(self, attr)
        if rval:
            rval = rval()
        return rval

    def __setattr__(self, attr, value):
        value = weakref.ref(value)
        return corolocal.local.__setattr__(self, attr, value)


store = WeakLocal()