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OpenStack Study: base.py**** CubicPower OpenStack Study ****
# Copyright (c) 2013 The Johns Hopkins University/Applied Physics Laboratory # 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. import abc import six from nova import keymgr from nova.openstack.common import log as logging LOG = logging.getLogger(__name__) @six.add_metaclass(abc.ABCMeta)
**** CubicPower OpenStack Study **** class VolumeEncryptor(object): """Base class to support encrypted volumes. A VolumeEncryptor provides hooks for attaching and detaching volumes, which are called immediately prior to attaching the volume to an instance and immediately following detaching the volume from an instance. This class performs no actions for either hook. """
**** CubicPower OpenStack Study **** def __init__(self, connection_info, **kwargs): self._key_manager = keymgr.API() self.encryption_key_id = kwargs.get('encryption_key_id')
**** CubicPower OpenStack Study **** def _get_key(self, context): """Retrieves the encryption key for the specified volume. :param: the connection information used to attach the volume """ return self._key_manager.get_key(context, self.encryption_key_id) @abc.abstractmethod
**** CubicPower OpenStack Study **** def attach_volume(self, context, **kwargs): """Hook called immediately prior to attaching a volume to an instance. """ pass @abc.abstractmethod
**** CubicPower OpenStack Study **** def detach_volume(self, **kwargs): """Hook called immediately after detaching a volume from an instance. """ pass
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