OpenStack Block Storage (Cinder)
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# 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.
from cinder import db
from cinder import objects
class VolumeMigration(object):
"""Lightweight Volume Migration object.
Will be used by KeyMigrator instead of regular Volume object to avoid
extra memory usage.
"""
@staticmethod
def from_volume(volume, context):
volume_migration = VolumeMigration(volume.id,
volume.user_id,
volume.encryption_key_id)
volume_migration._context = context
return volume_migration
def __init__(self, id, user_id, encryption_key_id):
self.id = id
self.user_id = user_id
self.orig_encryption_key_id = encryption_key_id
self.encryption_key_id = encryption_key_id
def _get_updates(self):
updates = {}
if self.orig_encryption_key_id != self.encryption_key_id:
updates['encryption_key_id'] = self.encryption_key_id
return updates
def _reset_changes(self):
self.orig_encryption_key_id = self.encryption_key_id
def save(self):
updates = self._get_updates()
if updates:
db.volume_update(self._context, self.id, updates)
self._reset_changes()
def __str__(self):
return 'id = {}'.format(self.id)
def __repr__(self):
return self.__str__()
class VolumeMigrationList(list):
def __init__(self):
list.__init__(self)
def append(self, volumes, context):
if not isinstance(volumes, objects.volume.VolumeList):
return
for volume in volumes:
volume_migration = VolumeMigration.from_volume(volume, context)
super(VolumeMigrationList, self).append(volume_migration)