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# Copyright (c) 2012 OpenStack Foundation
# Copyright (c) 2012 Cloudscaling
# 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 nova import db
from nova.openstack.common import log as logging
from nova.scheduler import filters
from nova.scheduler.filters import extra_specs_ops
LOG = logging.getLogger(__name__)
class AggregateInstanceExtraSpecsFilter(filters.BaseHostFilter):
"""AggregateInstanceExtraSpecsFilter works with InstanceType records."""
def host_passes(self, host_state, filter_properties):
"""Return a list of hosts that can create instance_type
Check that the extra specs associated with the instance type match
the metadata provided by aggregates. If not present return False.
"""
instance_type = filter_properties.get('instance_type')
if 'extra_specs' not in instance_type:
return True
context = filter_properties['context'].elevated()
metadata = db.aggregate_metadata_get_by_host(context, host_state.host)
for key, req in instance_type['extra_specs'].iteritems():
# NOTE(jogo) any key containing a scope (scope is terminated
# by a `:') will be ignored by this filter. (bug 1039386)
if key.count(':'):
continue
aggregate_vals = metadata.get(key, None)
if not aggregate_vals:
LOG.debug(_("%(host_state)s fails instance_type extra_specs "
"requirements"), locals())
return False
for aggregate_val in aggregate_vals:
if extra_specs_ops.match(aggregate_val, req):
break
else:
LOG.debug(_("%(host_state)s fails instance_type extra_specs "
"requirements"), locals())
return False
return True
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