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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 OpenStack LLC
#
# 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.
from keystone import exception
class DictKvs(dict):
def get(self, key, default=None):
try:
if isinstance(self[key], dict):
return self[key].copy()
else:
return self[key][:]
except KeyError:
if default is not None:
return default
raise exception.NotFound(target=key)
def set(self, key, value):
if isinstance(value, dict):
self[key] = value.copy()
else:
self[key] = value[:]
def delete(self, key):
"""Deletes an item, returning True on success, False otherwise."""
try:
del self[key]
except KeyError:
raise exception.NotFound(target=key)
INMEMDB = DictKvs()
class Base(object):
def __init__(self, db=None):
if db is None:
db = INMEMDB
elif isinstance(db, DictKvs):
db = db
elif isinstance(db, dict):
db = DictKvs(db)
self.db = db
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