63 lines
1.9 KiB
Python
63 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from kazoo import client as kazoo_client
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from kazoo.recipe import lock as kazoo_lock
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from nova.workflow.locks import api
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from oslo.config import cfg
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CONF = cfg.CONF
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CONF.import_opt('address', 'nova.servicegroup.zk', group='zookeeper')
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CONF.import_opt('recv_timeout', 'nova.servicegroup.zk', group='zookeeper')
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class Lock(api.Lock):
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def __init__(self, resource_uri, blocking, client):
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super(Lock, self).__init__(resource_uri, blocking)
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self._client = client
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self._lock = kazoo_lock.Lock(client, resource_uri)
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def acquire(self):
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return self._lock.acquire(self._blocking)
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def is_locked(self):
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return self._lock.is_acquired
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def release(self):
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return self._lock.release()
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def cancel(self):
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return self._lock.cancel()
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class LockProvider(api.LockProvider):
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def __init__(self, *args, **kwargs):
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self._client = kazoo_client.KazooClient(hosts=CONF.address,
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timeout=CONF.recv_timeout)
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self._client.start()
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def provide(self, resource_uri, blocking=True):
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return Lock(self._client, resource_uri, blocking)
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def close(self):
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if self._client:
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self._client.stop()
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