76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
# 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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"""Senlin common internal object model"""
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from oslo_utils import versionutils
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from oslo_versionedobjects import base
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from senlin import objects
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VersionedObjectDictCompat = base.VersionedObjectDictCompat
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class SenlinObject(base.VersionedObject):
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"""Base class for senlin objects.
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This is the base class for all objects that can be remoted or instantiated
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via RPC. Simply defining a sub-class of this class would make it remotely
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instantiatable. Objects should implement the "get" class method and the
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"save" object method.
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"""
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OBJ_PROJECT_NAMESPACE = 'senlin'
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VERSION = '1.0'
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@staticmethod
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def _from_db_object(context, obj, db_obj):
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if db_obj is None:
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return None
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for field in obj.fields:
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if field == 'metadata':
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obj['metadata'] = db_obj['meta_data']
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else:
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obj[field] = db_obj[field]
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obj._context = context
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obj.obj_reset_changes()
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return obj
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@staticmethod
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def _transpose_metadata(values):
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"""Utility function to translate metadata field."""
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if 'metadata' in values:
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value = values.pop('metadata')
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values['meta_data'] = value
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return values
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class SenlinObjectRegistry(base.VersionedObjectRegistry):
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def registration_hook(self, cls, index):
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"""Callback for object registration.
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When an object is registered, this function will be called for
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maintaining senlin.objects.$OBJECT as the highest-versioned
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implementation of a given object.
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"""
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version = versionutils.convert_version_to_tuple(cls.VERSION)
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if not hasattr(objects, cls.obj_name()):
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setattr(objects, cls.obj_name(), cls)
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else:
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curr_version = versionutils.convert_version_to_tuple(
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getattr(objects, cls.obj_name()).VERSION)
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if version >= curr_version:
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setattr(objects, cls.obj_name(), cls)
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