12b481a668
This adds the InstanceMapping object for interacting with the instance_mapping table. Rather than creating a new db api the database operations are embedded within the object. This keeps the logic near where it's being used. This does make an assumption about using sqlalchemy for now. In order to allow for substituting the database driver we will probably want to setup a subclassing system for objects to swap that part out. This would allow for finer control than we currently have. Change-Id: Ide9cc7a255b886647fd424c2030beff0335e2cd3 bp: cells-v2-mapping
137 lines
4.6 KiB
Python
137 lines
4.6 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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from nova.db.sqlalchemy import api as db_api
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from nova.db.sqlalchemy import api_models
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from nova import exception
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from nova import objects
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from nova.objects import base
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from nova.objects import fields
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class InstanceMapping(base.NovaTimestampObject, base.NovaObject):
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# Version 1.0: Initial version
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VERSION = '1.0'
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fields = {
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'id': fields.IntegerField(read_only=True),
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'instance_uuid': fields.UUIDField(),
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'cell_id': fields.IntegerField(),
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'project_id': fields.StringField(),
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}
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@staticmethod
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def _from_db_object(context, instance_mapping, db_instance_mapping):
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for key in instance_mapping.fields:
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setattr(instance_mapping, key, db_instance_mapping[key])
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instance_mapping.obj_reset_changes()
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instance_mapping._context = context
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return instance_mapping
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@staticmethod
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def _get_by_instance_uuid_from_db(context, instance_uuid):
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session = db_api.get_api_session()
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with session.begin():
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db_mapping = session.query(
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api_models.InstanceMapping).filter_by(
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instance_uuid=instance_uuid).first()
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if not db_mapping:
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raise exception.InstanceMappingNotFound(uuid=instance_uuid)
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return db_mapping
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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_mapping = cls._get_by_instance_uuid_from_db(context, instance_uuid)
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return cls._from_db_object(context, cls(), db_mapping)
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@staticmethod
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def _create_in_db(context, updates):
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session = db_api.get_api_session()
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db_mapping = api_models.InstanceMapping()
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db_mapping.update(updates)
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db_mapping.save(session)
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return db_mapping
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@base.remotable
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def create(self):
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db_mapping = self._create_in_db(self._context, self.obj_get_changes())
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self._from_db_object(self._context, self, db_mapping)
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@staticmethod
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def _save_in_db(context, instance_uuid, updates):
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session = db_api.get_api_session()
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with session.begin():
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db_mapping = session.query(
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api_models.InstanceMapping).filter_by(
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instance_uuid=instance_uuid).first()
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if not db_mapping:
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raise exception.InstanceMappingNotFound(uuid=instance_uuid)
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db_mapping.update(updates)
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session.add(db_mapping)
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return db_mapping
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@base.remotable
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def save(self):
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changes = self.obj_get_changes()
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db_mapping = self._save_in_db(self._context, self.instance_uuid,
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changes)
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self._from_db_object(self._context, self, db_mapping)
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self.obj_reset_changes()
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@staticmethod
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def _destroy_in_db(context, instance_uuid):
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session = db_api.get_api_session()
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with session.begin():
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result = session.query(api_models.InstanceMapping).filter_by(
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instance_uuid=instance_uuid).delete()
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if not result:
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raise exception.InstanceMappingNotFound(uuid=instance_uuid)
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@base.remotable
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def destroy(self):
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self._destroy_in_db(self._context, self.instance_uuid)
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class InstanceMappingList(base.ObjectListBase, base.NovaObject):
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# Version 1.0: Initial version
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VERSION = '1.0'
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fields = {
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'objects': fields.ListOfObjectsField('InstanceMapping'),
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}
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child_versions = {
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'1.0': '1.0',
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}
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@staticmethod
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def _get_by_project_id_from_db(context, project_id):
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session = db_api.get_api_session()
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with session.begin():
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db_mappings = session.query(api_models.InstanceMapping).filter_by(
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project_id=project_id).all()
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return db_mappings
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@base.remotable_classmethod
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def get_by_project_id(cls, context, project_id):
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db_mappings = cls._get_by_project_id_from_db(context, project_id)
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return base.obj_make_list(context, cls(), objects.InstanceMapping,
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db_mappings)
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