100 lines
3.8 KiB
Python
100 lines
3.8 KiB
Python
# Copyright 2014, eBay Inc.
|
|
# Copyright 2014, OpenStack Foundation
|
|
# 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_utils import uuidutils
|
|
|
|
from cinder.scheduler import filters
|
|
from cinder.volume import api as volume
|
|
|
|
|
|
class AffinityFilter(filters.BaseHostFilter):
|
|
def __init__(self):
|
|
self.volume_api = volume.API()
|
|
|
|
|
|
class DifferentBackendFilter(AffinityFilter):
|
|
"""Schedule volume on a different back-end from a set of volumes."""
|
|
|
|
def host_passes(self, host_state, filter_properties):
|
|
context = filter_properties['context']
|
|
scheduler_hints = filter_properties.get('scheduler_hints') or {}
|
|
|
|
affinity_uuids = scheduler_hints.get('different_host', [])
|
|
|
|
# scheduler hint verification: affinity_uuids can be a list of uuids
|
|
# or single uuid. The checks here is to make sure every single string
|
|
# in the list looks like a uuid, otherwise, this filter will fail to
|
|
# pass. Note that the filter does *NOT* ignore string doesn't look
|
|
# like a uuid, it is better to fail the request than serving it wrong.
|
|
if isinstance(affinity_uuids, list):
|
|
for uuid in affinity_uuids:
|
|
if uuidutils.is_uuid_like(uuid):
|
|
continue
|
|
else:
|
|
return False
|
|
elif uuidutils.is_uuid_like(affinity_uuids):
|
|
affinity_uuids = [affinity_uuids]
|
|
else:
|
|
# Not a list, not a string looks like uuid, don't pass it
|
|
# to DB for query to avoid potential risk.
|
|
return False
|
|
|
|
if affinity_uuids:
|
|
return not self.volume_api.get_all(
|
|
context, filters={'host': host_state.host,
|
|
'id': affinity_uuids,
|
|
'deleted': False})
|
|
|
|
# With no different_host key
|
|
return True
|
|
|
|
|
|
class SameBackendFilter(AffinityFilter):
|
|
"""Schedule volume on the same back-end as another volume."""
|
|
|
|
def host_passes(self, host_state, filter_properties):
|
|
context = filter_properties['context']
|
|
scheduler_hints = filter_properties.get('scheduler_hints') or {}
|
|
|
|
affinity_uuids = scheduler_hints.get('same_host', [])
|
|
|
|
# scheduler hint verification: affinity_uuids can be a list of uuids
|
|
# or single uuid. The checks here is to make sure every single string
|
|
# in the list looks like a uuid, otherwise, this filter will fail to
|
|
# pass. Note that the filter does *NOT* ignore string doesn't look
|
|
# like a uuid, it is better to fail the request than serving it wrong.
|
|
if isinstance(affinity_uuids, list):
|
|
for uuid in affinity_uuids:
|
|
if uuidutils.is_uuid_like(uuid):
|
|
continue
|
|
else:
|
|
return False
|
|
elif uuidutils.is_uuid_like(affinity_uuids):
|
|
affinity_uuids = [affinity_uuids]
|
|
else:
|
|
# Not a list, not a string looks like uuid, don't pass it
|
|
# to DB for query to avoid potential risk.
|
|
return False
|
|
|
|
if affinity_uuids:
|
|
return self.volume_api.get_all(
|
|
context, filters={'host': host_state.host,
|
|
'id': affinity_uuids,
|
|
'deleted': False})
|
|
|
|
# With no same_host key
|
|
return True
|