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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