1e48f0fcfc
THe swift backend was using swiftclient.Connection without any checks,
but that object is not thread safe, so we need to only have one
instance. This adds a wrapper to keep the same API but not share any
data.
Change-Id: Ic8152f8f7cb6d4d0b4ab473d2f937a9bc77b8453
(cherry picked from commit 80f8ca818a)
113 lines
3.6 KiB
Python
113 lines
3.6 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from six.moves import urllib
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from keystoneauth1.identity import v3
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from keystoneauth1 import session as keystone_session
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from oslo_log import log as logging
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import swiftclient
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from zaqar.common import decorators
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from zaqar import storage
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from zaqar.storage.swift import controllers
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from zaqar.storage.swift import options
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LOG = logging.getLogger(__name__)
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class DataDriver(storage.DataDriverBase):
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_DRIVER_OPTIONS = options._config_options()
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def __init__(self, conf, cache, control_driver):
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super(DataDriver, self).__init__(conf, cache, control_driver)
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self.swift_conf = self.conf[options.MESSAGE_SWIFT_GROUP]
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@property
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def capabilities(self):
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return (
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storage.Capabilities.AOD,
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storage.Capabilities.DURABILITY,
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)
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@decorators.lazy_property(write=False)
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def connection(self):
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return _ClientWrapper(self.swift_conf)
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def is_alive(self):
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return True
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@decorators.lazy_property(write=False)
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def queue_controller(self):
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return controllers.QueueController(self)
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@decorators.lazy_property(write=False)
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def message_controller(self):
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return controllers.MessageController(self)
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@decorators.lazy_property(write=False)
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def subscription_controller(self):
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return controllers.SubscriptionController(self)
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@decorators.lazy_property(write=False)
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def claim_controller(self):
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return controllers.ClaimController(self)
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def _health(self):
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raise NotImplementedError("No health checks")
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def close(self):
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pass
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class _ClientWrapper(object):
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"""Wrapper around swiftclient.Connection.
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This wraps swiftclient.Connection to give the same API, but provide a
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thread-safe alternative with a different object for every method call. It
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maintains performance by managing authentication itself, and passing the
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token afterwards.
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"""
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def __init__(self, conf):
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self.conf = conf
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self.parsed_url = urllib.parse.urlparse(conf.uri)
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self.token = None
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self.url = None
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self.session = None
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self.auth = None
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def _refresh_auth(self):
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self.auth = v3.Password(
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username=self.parsed_url.username,
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password=self.parsed_url.password,
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project_name=self.parsed_url.path[1:],
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user_domain_id='default',
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project_domain_id='default',
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auth_url=self.conf.auth_url)
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self.session = keystone_session.Session(auth=self.auth)
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self.url = self.session.get_endpoint(service_type='object-store')
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self.token = self.session.get_token()
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def __getattr__(self, attr):
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# This part is not thread-safe, but the worst case is having a bunch of
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# useless auth calls, so it should be okay.
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if (self.auth is None or
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self.auth.get_auth_ref(self.session).will_expire_soon()):
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self._refresh_auth()
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client = swiftclient.Connection(
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preauthurl=self.url,
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preauthtoken=self.token)
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return getattr(client, attr)
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