Source code for tooz.drivers.zake
# Copyright (c) 2013-2014 Mirantis Inc. 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.
from __future__ import absolute_import
from zake import fake_client
from zake import fake_storage
from tooz.drivers import zookeeper
[docs]class ZakeDriver(zookeeper.KazooDriver):
"""The driver using the Zake client which mimic a fake Kazoo client
without the need of real ZooKeeper servers.
"""
# NOTE(harlowja): this creates a shared backend 'storage' layer that
# would typically exist inside a zookeeper server, but since zake has
# no concept of a 'real' zookeeper server we create a fake one and share
# it among active clients to simulate zookeeper's consistent storage in
# a thread-safe manner.
fake_storage = fake_storage.FakeStorage(
fake_client.k_threading.SequentialThreadingHandler())
@classmethod
def _make_client(cls, parsed_url, options):
if 'storage' in options:
storage = options['storage'][-1]
else:
storage = cls.fake_storage
return fake_client.FakeClient(storage=storage)