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# 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.
"""Utility methods for scheduling."""
from nova.compute import flavors
from nova import db
from nova.openstack.common import jsonutils
def build_request_spec(ctxt, image, instances):
"""Build a request_spec for the scheduler.
The request_spec assumes that all instances to be scheduled are the same
type.
"""
instance = instances[0]
instance_type = flavors.extract_flavor(instance)
# NOTE(comstud): This is a bit ugly, but will get cleaned up when
# we're passing an InstanceType internal object.
extra_specs = db.instance_type_extra_specs_get(ctxt,
instance_type['flavorid'])
instance_type['extra_specs'] = extra_specs
request_spec = {
'image': image,
'instance_properties': instance,
'instance_type': instance_type,
'num_instances': len(instances),
# NOTE(alaski): This should be removed as logic moves from the
# scheduler to conductor. Provides backwards compatibility now.
'instance_uuids': [inst['uuid'] for inst in instances]}
return jsonutils.to_primitive(request_spec)
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