66 lines
2.3 KiB
Python
66 lines
2.3 KiB
Python
# Copyright (c) 2011-2012 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo.config import cfg
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from nova import db
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from nova.openstack.common import log as logging
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from nova.scheduler import filters
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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CONF.import_opt('default_availability_zone', 'nova.availability_zones')
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class AvailabilityZoneFilter(filters.BaseHostFilter):
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"""Filters Hosts by availability zone.
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Works with aggregate metadata availability zones, using the key
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'availability_zone'
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Note: in theory a compute node can be part of multiple availability_zones
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"""
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# Availability zones do not change within a request
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run_filter_once_per_request = True
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def host_passes(self, host_state, filter_properties):
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spec = filter_properties.get('request_spec', {})
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props = spec.get('instance_properties', {})
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availability_zone = props.get('availability_zone')
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if not availability_zone:
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return True
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context = filter_properties['context']
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metadata = db.aggregate_metadata_get_by_host(
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context, host_state.host, key='availability_zone')
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if 'availability_zone' in metadata:
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hosts_passes = availability_zone in metadata['availability_zone']
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host_az = metadata['availability_zone']
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else:
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hosts_passes = availability_zone == CONF.default_availability_zone
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host_az = CONF.default_availability_zone
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if not hosts_passes:
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LOG.debug("Availability Zone '%(az)s' requested. "
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"%(host_state)s has AZs: %(host_az)s",
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{'host_state': host_state,
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'az': availability_zone,
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'host_az': host_az})
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return hosts_passes
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