Chris Dent
def4b17934
nova/db/__init__.py was importing * from nova.db.api. This meant that any time any code anywhere within the nova.db package was imported then nova.db.api was too, leading to a cascade of imports that may not have been desired. Also, in general, code in __init__.py is a pain. Therefore, this change adjusts code that so that either: * nova.db.api is used directly * nova.db.api is imported as 'db' In either case, the functionality remains the same. The primary goal of this change was to make it possible to import the model files without having to import the db api. Moving the model files to a different place in the directory hierarchy was considered, but given that "code in __init__.py is a pain" this mode was chosen. This looks like a very large change, but it is essentially adjusting package names, many in mocks. Change-Id: Ic1fd7c87ceda05eeb96735da2a415ef37060bb1a
83 lines
3.4 KiB
Python
83 lines
3.4 KiB
Python
# Copyright 2015 Red Hat Inc.
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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_serialization import jsonutils
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from oslo_utils import versionutils
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from nova.db import api as db
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from nova import exception
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from nova.objects import base
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from nova.objects import fields
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@base.NovaObjectRegistry.register
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class MigrationContext(base.NovaPersistentObject, base.NovaObject):
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"""Data representing additional resources related to a migration.
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Some resources cannot be calculated from knowing the flavor alone for the
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purpose of resources tracking, but need to be persisted at the time the
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claim was made, for subsequent resource tracking runs to be consistent.
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MigrationContext objects are created when the claim is done and are there
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to facilitate resource tracking and final provisioning of the instance on
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the destination host.
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"""
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# Version 1.0: Initial version
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# Version 1.1: Add old/new pci_devices and pci_requests
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VERSION = '1.1'
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fields = {
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'instance_uuid': fields.UUIDField(),
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'migration_id': fields.IntegerField(),
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'new_numa_topology': fields.ObjectField('InstanceNUMATopology',
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nullable=True),
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'old_numa_topology': fields.ObjectField('InstanceNUMATopology',
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nullable=True),
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'new_pci_devices': fields.ObjectField('PciDeviceList',
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nullable=True),
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'old_pci_devices': fields.ObjectField('PciDeviceList',
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nullable=True),
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'new_pci_requests': fields.ObjectField('InstancePCIRequests',
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nullable=True),
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'old_pci_requests': fields.ObjectField('InstancePCIRequests',
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nullable=True),
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}
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@classmethod
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def obj_make_compatible(cls, primitive, target_version):
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target_version = versionutils.convert_version_to_tuple(target_version)
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if target_version < (1, 1):
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primitive.pop('old_pci_devices', None)
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primitive.pop('new_pci_devices', None)
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primitive.pop('old_pci_requests', None)
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primitive.pop('new_pci_requests', None)
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@classmethod
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def obj_from_db_obj(cls, db_obj):
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primitive = jsonutils.loads(db_obj)
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return cls.obj_from_primitive(primitive)
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@base.remotable_classmethod
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def get_by_instance_uuid(cls, context, instance_uuid):
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db_extra = db.instance_extra_get_by_instance_uuid(
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context, instance_uuid, columns=['migration_context'])
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if not db_extra:
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raise exception.MigrationContextNotFound(
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instance_uuid=instance_uuid)
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if db_extra['migration_context'] is None:
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return None
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return cls.obj_from_db_obj(db_extra['migration_context'])
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