40946a9349
If module etcd3gw is not required for used backend, then no need to have it installed and imported. Otherwise we always have ugly log error: Could not load 'oslo_cache.etcd3gw': No module named 'etcd3gw': ModuleNotFoundError: No module named 'etcd3gw Closes-Bug: 1928318 Change-Id: Icbe6dc3e93b4d2fec1ceb88366027294e49d7032
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
# Copyright 2015 Mirantis Inc
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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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"""dogpile.cache backend that uses etcd 3.x for storage"""
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from dogpile.cache import api
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from oslo_cache import core
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from oslo_serialization import jsonutils
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__all__ = [
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'Etcd3gwCacheBackend'
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]
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_NO_VALUE = core.NO_VALUE
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class Etcd3gwCacheBackend(api.CacheBackend):
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#: Default socket/lock/member/leader timeout used when none is provided.
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DEFAULT_TIMEOUT = 30
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#: Default hostname used when none is provided.
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DEFAULT_HOST = "localhost"
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#: Default port used if none provided (4001 or 2379 are the common ones).
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DEFAULT_PORT = 2379
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def __init__(self, arguments):
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self.host = arguments.get('host', self.DEFAULT_HOST)
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self.port = arguments.get('port', self.DEFAULT_PORT)
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self.timeout = int(arguments.get('timeout', self.DEFAULT_TIMEOUT))
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# module etcd3gw is only required when etcd3gw backend is used
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import etcd3gw
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self._client = etcd3gw.client(host=self.host,
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port=self.port,
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timeout=self.timeout)
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def get(self, key):
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values = self._client.get(key, False)
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if not values:
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return core.NO_VALUE
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value, metadata = jsonutils.loads(values[0])
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return api.CachedValue(value, metadata)
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def get_multi(self, keys):
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"""Retrieves the value for a list of keys."""
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return [self.get(key) for key in keys]
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def set(self, key, value):
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self.set_multi({key: value})
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def set_multi(self, mapping):
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lease = None
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if self.timeout:
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lease = self._client.lease(ttl=self.timeout)
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for key, value in mapping.items():
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self._client.put(key, jsonutils.dumps(value), lease)
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def delete(self, key):
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self._client.delete(key)
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def delete_multi(self, keys):
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for key in keys:
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self._client.delete(key)
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