142 lines
5.3 KiB
Python
142 lines
5.3 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 sqlalchemy.orm import joinedload
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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.objects import base
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from nova.objects import cell_mapping
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from nova.objects import fields
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def _cell_id_in_updates(updates):
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cell_mapping_obj = updates.pop("cell_mapping", None)
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if cell_mapping_obj:
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updates["cell_id"] = cell_mapping_obj.id
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@base.NovaObjectRegistry.register
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class HostMapping(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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'host': fields.StringField(),
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'cell_mapping': fields.ObjectField('CellMapping'),
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}
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def _get_cell_mapping(self):
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with db_api.api_context_manager.reader.using(self._context) as session:
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cell_map = (session.query(api_models.CellMapping)
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.join(api_models.HostMapping)
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.filter(api_models.HostMapping.host == self.host)
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.first())
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if cell_map is not None:
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return cell_mapping.CellMapping._from_db_object(
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self._context, cell_mapping.CellMapping(), cell_map)
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def _load_cell_mapping(self):
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self.cell_mapping = self._get_cell_mapping()
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def obj_load_attr(self, attrname):
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if attrname == 'cell_mapping':
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self._load_cell_mapping()
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@staticmethod
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def _from_db_object(context, host_mapping, db_host_mapping):
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for key in host_mapping.fields:
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db_value = db_host_mapping.get(key)
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if key == "cell_mapping":
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# NOTE(dheeraj): If cell_mapping is stashed in db object
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# we load it here. Otherwise, lazy loading will happen
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# when .cell_mapping is accessd later
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if not db_value:
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continue
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db_value = cell_mapping.CellMapping._from_db_object(
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host_mapping._context, cell_mapping.CellMapping(),
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db_value)
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setattr(host_mapping, key, db_value)
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host_mapping.obj_reset_changes()
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host_mapping._context = context
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return host_mapping
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@staticmethod
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@db_api.api_context_manager.reader
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def _get_by_host_from_db(context, host):
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db_mapping = (context.session.query(api_models.HostMapping)
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.options(joinedload('cell_mapping'))
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.filter(api_models.HostMapping.host == host)).first()
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if not db_mapping:
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raise exception.HostMappingNotFound(name=host)
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return db_mapping
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@base.remotable_classmethod
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def get_by_host(cls, context, host):
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db_mapping = cls._get_by_host_from_db(context, host)
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return cls._from_db_object(context, cls(), db_mapping)
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@staticmethod
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@db_api.api_context_manager.writer
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def _create_in_db(context, updates):
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db_mapping = api_models.HostMapping()
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db_mapping.update(updates)
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db_mapping.save(context.session)
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# NOTE: This is done because a later access will trigger a lazy load
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# outside of the db session so it will fail. We don't lazy load
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# cell_mapping on the object later because we never need a HostMapping
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# without the CellMapping.
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db_mapping.cell_mapping
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return db_mapping
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@base.remotable
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def create(self):
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changes = self.obj_get_changes()
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# cell_mapping must be mapped to cell_id for create
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_cell_id_in_updates(changes)
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db_mapping = self._create_in_db(self._context, changes)
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self._from_db_object(self._context, self, db_mapping)
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@staticmethod
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@db_api.api_context_manager.writer
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def _save_in_db(context, obj, updates):
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db_mapping = context.session.query(api_models.HostMapping).filter_by(
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id=obj.id).first()
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if not db_mapping:
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raise exception.HostMappingNotFound(name=obj.host)
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db_mapping.update(updates)
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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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# cell_mapping must be mapped to cell_id for updates
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_cell_id_in_updates(changes)
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db_mapping = self._save_in_db(self._context, self.host, 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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@db_api.api_context_manager.writer
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def _destroy_in_db(context, host):
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result = context.session.query(api_models.HostMapping).filter_by(
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host=host).delete()
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if not result:
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raise exception.HostMappingNotFound(name=host)
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@base.remotable
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def destroy(self):
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self._destroy_in_db(self._context, self.host)
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