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
# 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 zake import fake_client
from zake import fake_storage

from tooz import coordination
from tooz.drivers import zookeeper

[docs]class ZakeDriver(zookeeper.KazooDriver): """This driver uses the `zake`_ client to mimic real `zookeeper`_ servers. It **should** be mainly used (and **is** really only intended to be used in this manner) for testing and integration (where real `zookeeper`_ servers are typically not available). .. _zake: .. _zookeeper: """ CHARACTERISTICS = ( coordination.Characteristics.NON_TIMEOUT_BASED, coordination.Characteristics.DISTRIBUTED_ACROSS_THREADS, ) """ Tuple of :py:class:`~tooz.coordination.Characteristics` introspectable enum member(s) that can be used to interogate how this driver works. """ # 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'] else: storage = cls.fake_storage return fake_client.FakeClient(storage=storage)