57 lines
1.6 KiB
Python
57 lines
1.6 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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import abc
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import functools
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from oslo_utils import excutils
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import six
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def rollback_wrapper(original):
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@functools.wraps(original)
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def wrap(self):
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try:
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return original(self)
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except Exception:
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with excutils.save_and_reraise_exception():
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self.rollback()
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return wrap
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@six.add_metaclass(abc.ABCMeta)
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class TaskBase(object):
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def __init__(self, context, instance):
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self.context = context
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self.instance = instance
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@rollback_wrapper
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def execute(self):
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"""Run task's logic, written in _execute() method
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"""
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return self._execute()
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@abc.abstractmethod
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def _execute(self):
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"""Descendants should place task's logic here, while resource
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initialization should be performed over __init__
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"""
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pass
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def rollback(self):
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"""Rollback failed task
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Descendants should implement this method to allow task user to
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rollback status to state before execute method was call
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"""
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pass
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