65 lines
2.1 KiB
Python
65 lines
2.1 KiB
Python
# Copyright 2013: Mirantis Inc.
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# All Rights Reserved.
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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 galloper.db import api as db_api
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from galloper.openstack.common import uuidutils
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class Node(object):
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"""This method returns openstack.common.db.api.DBAPI instance.
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When we call methods we actually call instance methods from
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backend which is instance of AConnection subclass.
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"""
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dbapi = db_api.get_instance()
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fields = ('id', 'uuid', 'meta')
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default_generators = {
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'uuid': uuidutils.generate_uuid,
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'meta': lambda: {}
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}
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@classmethod
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def from_db(cls, db_node):
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"""Converts a database entity to a formal object."""
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node = cls()
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for field in cls.fields:
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node[field] = db_node[field]
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return node
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@classmethod
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def get_by_uuid(cls, uuid):
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"""Find a node based on uuid and return a Node object.
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:param uuid: the uuid of a node.
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:returns: a :class:`Node` object.
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"""
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db_node = cls.dbapi.get_node(uuid)
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return Node.from_db(db_node)
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def to_data(self):
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data = {}
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for field in self.fields:
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data[field] = getattr(self, field)
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return data
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def save(self):
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self.dbapi.update_node(self.uuid, self.to_data())
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def refresh(self):
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actual = self.__class__.get_by_uuid(self.uuid)
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for field in self.fields:
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if (hasattr(self, field) and
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getattr(self, field) != getattr(actual, field)):
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setattr(self, field, getattr(actual, field))
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