961d91ff7a
This change adds new helpers that, taken together, allow to resume the flows having nothing but flow detail at hands. First one, load_from_factory, gets flow factory function as a parameter and saves its fully qualified name and arguments to flow metadata. Others can be used to re-create the flow using that metadata, and load it into engine. Change-Id: Ia3cd989b3b0388ec0a9f09fe527f768eec5cc904
114 lines
4.3 KiB
Python
114 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2013 Yahoo! Inc. 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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import mock
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from taskflow import test
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from taskflow.tests import utils as test_utils
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from taskflow.utils import persistence_utils as p_utils
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import taskflow.engines
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class FlowFromDetailTestCase(test.TestCase):
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def test_no_meta(self):
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_lb, flow_detail = p_utils.temporary_flow_detail()
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self.assertIs(flow_detail.meta, None)
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expected_msg = '^Cannot .* no factory information saved.$'
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with self.assertRaisesRegexp(ValueError, expected_msg):
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taskflow.engines.flow_from_detail(flow_detail)
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def test_no_factory_in_meta(self):
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_lb, flow_detail = p_utils.temporary_flow_detail()
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flow_detail.meta = {}
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expected_msg = '^Cannot .* no factory information saved.$'
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with self.assertRaisesRegexp(ValueError, expected_msg):
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taskflow.engines.flow_from_detail(flow_detail)
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def test_no_importable_function(self):
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_lb, flow_detail = p_utils.temporary_flow_detail()
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flow_detail.meta = dict(factory=dict(
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name='you can not import me, i contain spaces'
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))
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expected_msg = '^Could not import factory'
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with self.assertRaisesRegexp(ImportError, expected_msg):
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taskflow.engines.flow_from_detail(flow_detail)
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def test_no_arg_factory(self):
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name = 'some.test.factory'
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_lb, flow_detail = p_utils.temporary_flow_detail()
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flow_detail.meta = dict(factory=dict(name=name))
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with mock.patch('taskflow.openstack.common.importutils.import_class',
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return_value=lambda: 'RESULT') as mock_import:
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result = taskflow.engines.flow_from_detail(flow_detail)
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mock_import.assert_called_onec_with(name)
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self.assertEquals(result, 'RESULT')
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def test_factory_with_arg(self):
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name = 'some.test.factory'
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_lb, flow_detail = p_utils.temporary_flow_detail()
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flow_detail.meta = dict(factory=dict(name=name, args=['foo']))
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with mock.patch('taskflow.openstack.common.importutils.import_class',
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return_value=lambda x: 'RESULT %s' % x) as mock_import:
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result = taskflow.engines.flow_from_detail(flow_detail)
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mock_import.assert_called_onec_with(name)
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self.assertEquals(result, 'RESULT foo')
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def my_flow_factory(task_name):
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return test_utils.DummyTask(name=task_name)
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class LoadFromFactoryTestCase(test.TestCase):
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def test_non_reimportable(self):
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def factory():
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pass
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with self.assertRaisesRegexp(ValueError,
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'Flow factory .* is not reimportable'):
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taskflow.engines.load_from_factory(factory)
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def test_it_works(self):
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engine = taskflow.engines.load_from_factory(
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my_flow_factory, factory_kwargs={'task_name': 'test1'})
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self.assertIsInstance(engine._flow, test_utils.DummyTask)
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fd = engine.storage._flowdetail
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self.assertEquals(fd.name, 'test1')
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self.assertEquals(fd.meta.get('factory'), {
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'name': '%s.my_flow_factory' % __name__,
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'args': [],
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'kwargs': {'task_name': 'test1'},
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})
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def test_it_works_by_name(self):
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factory_name = '%s.my_flow_factory' % __name__
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engine = taskflow.engines.load_from_factory(
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factory_name, factory_kwargs={'task_name': 'test1'})
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self.assertIsInstance(engine._flow, test_utils.DummyTask)
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fd = engine.storage._flowdetail
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self.assertEquals(fd.name, 'test1')
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self.assertEquals(fd.meta.get('factory'), {
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'name': factory_name,
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'args': [],
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'kwargs': {'task_name': 'test1'},
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})
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