98 lines
2.5 KiB
Python
98 lines
2.5 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# -*- encoding: utf-8 -*-
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#
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# Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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"""
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Base classes for storage engines
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"""
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import abc
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from tuskar.openstack.common.db import api as db_api
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_BACKEND_MAPPING = {'sqlalchemy': 'tuskar.db.sqlalchemy.api'}
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IMPL = db_api.DBAPI(backend_mapping=_BACKEND_MAPPING)
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def get_instance():
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"""Return a DB API instance."""
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return IMPL
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class Connection(object):
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"""Base class for storage system connections."""
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def __init__(self):
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"""Constructor."""
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@abc.abstractmethod
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def get_blaas(self, columns):
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"""Return a list of dicts of all blaas.
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:param columns: List of columns to return.
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"""
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@abc.abstractmethod
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def create_blaa(self, values):
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"""Create a new blaa.
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:param values: A dict describing a blaa.
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{
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'uuid': uuidutils.generate_uuid(),
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'description': 'foo',
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}
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:returns: A blaa.
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"""
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@abc.abstractmethod
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def get_blaa(self, blaa):
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"""Return a blaa.
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:param node: The id or uuid of a blaa.
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:returns: A blaa.
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"""
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@abc.abstractmethod
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def destroy_blaa(self, node):
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"""Destroy a blaa.
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:param node: The id or uuid of a blaa.
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"""
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@abc.abstractmethod
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def update_blaa(self, blaa, values):
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"""Update properties of a blaa.
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:param node: The id or uuid of a blaa.
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:param values: Dict of values to update.
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May be a partial list. For example:
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{
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'description': 'foobar',
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}
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:returns: A blaa.
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"""
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@abc.abstractmethod
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def get_sausages_by_blaa(self, blaa):
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"""List all the sausages for a given blaa.
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:param node: The id or uuid of a blaa.
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:returns: A list of sausages.
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"""
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