cf1ad08b0f
Porposed change of this commit is: 1.Add etcd db model and implements etcd API for ResourceClass. 2.Add 'uuid' field into ResourceClass. Part of blueprint expose-host-capabilities Change-Id: I9e5678e8742fd4c6a26b9ced6d6eccd6b7976363
160 lines
6.2 KiB
Python
160 lines
6.2 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 oslo_versionedobjects import fields
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from zun.db import api as dbapi
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from zun.objects import base
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from zun.objects import fields as z_fields
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@base.ZunObjectRegistry.register
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class ResourceClass(base.ZunPersistentObject, base.ZunObject):
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# Version 1.0: Initial version
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# Version 1.1: Add uuid field
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VERSION = '1.1'
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fields = {
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'id': fields.IntegerField(read_only=True),
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'uuid': fields.UUIDField(nullable=False),
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'name': z_fields.ResourceClassField(nullable=False),
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}
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@staticmethod
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def _from_db_object(resource, db_resource):
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"""Converts a database entity to a formal object."""
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for field in resource.fields:
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setattr(resource, field, db_resource[field])
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resource.obj_reset_changes()
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return resource
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@staticmethod
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def _from_db_object_list(db_objects, cls, context):
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"""Converts a list of database entities to a list of formal objects."""
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return [ResourceClass._from_db_object(cls(context), obj)
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for obj in db_objects]
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@base.remotable_classmethod
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def get_by_uuid(cls, context, uuid):
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"""Find a resource class based on uuid.
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:param uuid: the uuid of a resource class.
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:param context: Security context
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:returns: a :class:`ResourceClass` object.
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"""
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db_resource = dbapi.get_resource_class(context, uuid)
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resource = ResourceClass._from_db_object(cls(context), db_resource)
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return resource
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@base.remotable_classmethod
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def get_by_name(cls, context, name):
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"""Find a resource class based on name.
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:param name: the name of a resource class.
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:param context: Security context
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:returns: a :class:`ResourceClass` object.
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"""
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db_resource = dbapi.get_resource_class(context, name)
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resource = ResourceClass._from_db_object(cls(context), db_resource)
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return resource
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@base.remotable_classmethod
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def list(cls, context, limit=None, marker=None, sort_key=None,
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sort_dir=None):
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"""Return a list of ResourceClass objects.
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:param context: Security context.
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:param limit: maximum number of resources to return in a single result.
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:param marker: pagination marker for large data sets.
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:param sort_key: column to sort results by.
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:param sort_dir: direction to sort. "asc" or "desc".
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:returns: a list of :class:`ResourceClass` object.
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"""
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db_resources = dbapi.list_resource_classes(
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context, limit=limit, marker=marker, sort_key=sort_key,
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sort_dir=sort_dir)
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return ResourceClass._from_db_object_list(
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db_resources, cls, context)
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@base.remotable
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def create(self, context):
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"""Create a ResourceClass record in the DB.
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:param context: Security context. NOTE: This should only
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be used internally by the indirection_api.
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Unfortunately, RPC requires context as the first
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argument, even though we don't use it.
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A context should be set when instantiating the
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object, e.g.: ResourceClass(context)
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"""
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values = self.obj_get_changes()
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db_resource = dbapi.create_resource_class(context, values)
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self._from_db_object(self, db_resource)
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@base.remotable
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def destroy(self, context=None):
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"""Delete the ResourceClass from the DB.
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:param context: Security context. NOTE: This should only
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be used internally by the indirection_api.
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Unfortunately, RPC requires context as the first
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argument, even though we don't use it.
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A context should be set when instantiating the
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object, e.g.: ResourceClass(context)
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"""
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dbapi.destroy_resource_class(context, self.uuid)
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self.obj_reset_changes()
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@base.remotable
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def save(self, context=None):
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"""Save updates to this ResourceClass.
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Updates will be made column by column based on the result
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of self.what_changed().
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:param context: Security context. NOTE: This should only
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be used internally by the indirection_api.
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Unfortunately, RPC requires context as the first
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argument, even though we don't use it.
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A context should be set when instantiating the
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object, e.g.: ResourceClass(context)
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"""
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updates = self.obj_get_changes()
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dbapi.update_resource_class(context, self.uuid, updates)
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self.obj_reset_changes()
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@base.remotable
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def refresh(self, context=None):
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"""Loads updates for this ResourceClass.
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Loads a resource class with the same id from the database and
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checks for updated attributes. Updates are applied from
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the loaded resource class column by column, if there are any
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updates.
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:param context: Security context. NOTE: This should only
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be used internally by the indirection_api.
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Unfortunately, RPC requires context as the first
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argument, even though we don't use it.
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A context should be set when instantiating the
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object, e.g.: ResourceClass(context)
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"""
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current = self.__class__.get_by_uuid(self._context, self.uuid)
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for field in self.fields:
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if self.obj_attr_is_set(field) and \
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getattr(self, field) != getattr(current, field):
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setattr(self, field, getattr(current, field))
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