c1b25762dc
Task results are saved on success and passed to revert method on revert. If task failed (execute method raised an exception), special object of type taskflow.utils.misc.Failure is created and saved as task result to indicate that. To store results Storage class is introduced. As for now it is simple tiny wrapper of a dictionary, but future plans include rewriting it using persistence API and adding more sophisticated functionality. Change-Id: Ic806421a3780653602d8879c33fdf655950a6804
92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
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# Copyright (C) 2013 Rackspace Hosting 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 distutils import version
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import sys
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def get_task_version(task):
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"""Gets a tasks *string* version, whether it is a task object/function."""
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task_version = getattr(task, 'version')
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if isinstance(task_version, (list, tuple)):
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task_version = '.'.join(str(item) for item in task_version)
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if task_version is not None and not isinstance(task_version, basestring):
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task_version = str(task_version)
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return task_version
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def is_version_compatible(version_1, version_2):
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"""Checks for major version compatibility of two *string" versions."""
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try:
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version_1_tmp = version.StrictVersion(version_1)
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version_2_tmp = version.StrictVersion(version_2)
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except ValueError:
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version_1_tmp = version.LooseVersion(version_1)
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version_2_tmp = version.LooseVersion(version_2)
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version_1 = version_1_tmp
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version_2 = version_2_tmp
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if version_1 == version_2 or version_1.version[0] == version_2.version[0]:
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return True
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return False
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class LastFedIter(object):
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"""An iterator which yields back the first item and then yields back
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results from the provided iterator.
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"""
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def __init__(self, first, rest_itr):
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self.first = first
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self.rest_itr = rest_itr
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def __iter__(self):
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yield self.first
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for i in self.rest_itr:
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yield i
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class Failure(object):
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"""Indicates failure"""
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# NOTE(imelnikov): flow_utils.FlowFailure uses runner, but
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# engine code does not, so we need separate class
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def __init__(self, exc_info=None):
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if exc_info is not None:
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self._exc_info = exc_info
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else:
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self._exc_info = sys.exc_info()
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@property
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def exc_info(self):
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return self._exc_info
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@property
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def exc(self):
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return self._exc_info[1]
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def reraise(self):
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raise self.exc_info[0], self.exc_info[1], self.exc_info[2]
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def __str__(self):
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try:
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exc_name = self.exc_info[0].__name__
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except AttributeError:
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exc_name = str(self.exc_info)
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return 'Failure: %s: %s' % (exc_name, self.exc_info[1])
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