109 lines
3.5 KiB
Python
109 lines
3.5 KiB
Python
# (c) Copyright 2015 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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import time
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import mock
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from os_brick import exception
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from os_brick.tests import base
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from os_brick import utils
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class WrongException(exception.BrickException):
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pass
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class TestRetryDecorator(base.TestCase):
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def test_no_retry_required(self):
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self.counter = 0
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with mock.patch.object(time, 'sleep') as mock_sleep:
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@utils.retry(exceptions=exception.VolumeDeviceNotFound,
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interval=2,
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retries=3,
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backoff_rate=2)
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def succeeds():
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self.counter += 1
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return 'success'
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ret = succeeds()
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self.assertFalse(mock_sleep.called)
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self.assertEqual(ret, 'success')
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self.assertEqual(self.counter, 1)
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def test_retries_once(self):
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self.counter = 0
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interval = 2
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backoff_rate = 2
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retries = 3
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with mock.patch.object(time, 'sleep') as mock_sleep:
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@utils.retry(exception.VolumeDeviceNotFound,
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interval,
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retries,
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backoff_rate)
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def fails_once():
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self.counter += 1
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if self.counter < 2:
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raise exception.VolumeDeviceNotFound(device='fake')
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else:
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return 'success'
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ret = fails_once()
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self.assertEqual(ret, 'success')
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self.assertEqual(self.counter, 2)
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self.assertEqual(mock_sleep.call_count, 1)
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mock_sleep.assert_called_with(interval * backoff_rate)
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def test_limit_is_reached(self):
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self.counter = 0
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retries = 3
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interval = 2
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backoff_rate = 4
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with mock.patch.object(time, 'sleep') as mock_sleep:
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@utils.retry(exception.VolumeDeviceNotFound,
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interval,
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retries,
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backoff_rate)
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def always_fails():
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self.counter += 1
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raise exception.VolumeDeviceNotFound(device='fake')
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self.assertRaises(exception.VolumeDeviceNotFound,
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always_fails)
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self.assertEqual(retries, self.counter)
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expected_sleep_arg = []
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for i in range(retries):
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if i > 0:
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interval *= backoff_rate
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expected_sleep_arg.append(float(interval))
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mock_sleep.assert_has_calls(
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list(map(mock.call, expected_sleep_arg)))
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def test_wrong_exception_no_retry(self):
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with mock.patch.object(time, 'sleep') as mock_sleep:
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@utils.retry(exceptions=exception.VolumeDeviceNotFound)
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def raise_unexpected_error():
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raise WrongException("wrong exception")
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self.assertRaises(WrongException, raise_unexpected_error)
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self.assertFalse(mock_sleep.called)
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