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92 lines (74 loc) · 2.58 KB
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#!/usr/bin/env python
# encoding: utf-8
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
"""This module provides core classes.
"""
from flask_sqlalchemy import SQLAlchemy
DB = SQLAlchemy()
class Ec2stackError(Exception):
def __init__(self, code, error, message):
self.code = code
self.error = error
self.message = message
class Service(object):
__model__ = None
def _isinstance(self, model, raise_error=True):
"""
Checks if the given model is an instance of the service.
@param model: Model to be checked.
@param raise_error: ValueError if model isn't the correct type.
@return: Bool @raise ValueError: stating not of correct type.
"""
valid_type = isinstance(model, self.__model__)
if not valid_type and raise_error:
raise ValueError('%s is not of type %s' % (model, self.__model__))
return valid_type
def save(self, model):
"""
Saves the given Model.
@param model: The model to be saved.
@return: The saved model.
"""
self._isinstance(model)
DB.session.add(model)
DB.session.commit()
return model
def get(self, primarykey):
"""
Get the model via primarykey.
@param primarykey: primarykey of the model you want.
@return: Found model.
"""
return self.__model__.query.get(primarykey)
def create(self, **kwargs):
"""
Creates a new object.
@param kwargs: Parameters for the model.
@return: Created model.
"""
return self.save(self.__model__(**kwargs))
def delete(self, model):
"""
Deletes the given model.
@param model: Model to be deleted.
"""
self._isinstance(model)
DB.session.delete(model)
DB.session.commit()