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OpenStack Study: aggregate_instance_extra_specs.py**** CubicPower OpenStack Study ****
# 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.gettextutils import _ 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__) _SCOPE = 'aggregate_instance_extra_specs'
**** CubicPower OpenStack Study **** class AggregateInstanceExtraSpecsFilter(filters.BaseHostFilter): """AggregateInstanceExtraSpecsFilter works with InstanceType records.""" # Aggregate data and instance type does not change within a request run_filter_once_per_request = True
**** CubicPower OpenStack Study **** 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(): # Either not scope format, or aggregate_instance_extra_specs scope scope = key.split(':', 1) if len(scope) > 1: if scope[0] != _SCOPE: continue else: del scope[0] key = scope[0] aggregate_vals = metadata.get(key, None) if not aggregate_vals: LOG.debug(_("%(host_state)s fails instance_type extra_specs " "requirements. Extra_spec %(key)s is not in aggregate."), {'host_state': host_state, 'key': key}) 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. '%(aggregate_vals)s' do not " "match '%(req)s'"), {'host_state': host_state, 'req': req, 'aggregate_vals': aggregate_vals}) return False return True
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