OpenStack Block Storage (Cinder)
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# Copyright (c) 2014 Pure Storage, Inc.
# 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.
from oslo_log import log as logging
from cinder import context
from cinder import exception
LOG = logging.getLogger(__name__)
class VolumeDriverUtils(object):
def __init__(self, namespace, db):
self._data_namespace = namespace
self._db = db
@staticmethod
def _get_context(ctxt):
if not ctxt:
return context.get_admin_context()
return ctxt
def get_driver_initiator_data(self, initiator, ctxt=None):
try:
return self._db.driver_initiator_data_get(
self._get_context(ctxt),
initiator,
self._data_namespace
)
except exception.CinderException:
LOG.exception("Failed to get driver initiator data for"
" initiator %(initiator)s and namespace"
" %(namespace)s",
{'initiator': initiator,
'namespace': self._data_namespace})
raise
def insert_driver_initiator_data(self, initiator, key, value, ctxt=None):
"""Update the initiator data at key with value.
If the key has already been set to something return False, otherwise
if saved successfully return True.
"""
try:
return self._db.driver_initiator_data_insert_by_key(
self._get_context(ctxt),
initiator,
self._data_namespace,
key,
value
)
except exception.CinderException:
LOG.exception("Failed to insert initiator data for"
" initiator %(initiator)s and backend"
" %(backend)s for key %(key)s.",
{'initiator': initiator,
'backend': self._data_namespace,
'key': key})
raise