140 lines
4.6 KiB
Python
140 lines
4.6 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import mock
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from oslo.config import cfg
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from neutron.plugins.mlnx.common import comm_utils
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from neutron.plugins.mlnx.common import config # noqa
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from neutron.plugins.mlnx.common import exceptions
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from neutron.tests import base
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class WrongException(Exception):
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pass
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class TestRetryDecorator(base.BaseTestCase):
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def setUp(self):
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super(TestRetryDecorator, self).setUp()
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self.sleep_fn_p = mock.patch.object(comm_utils.RetryDecorator,
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'sleep_fn')
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self.sleep_fn = self.sleep_fn_p.start()
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def test_no_retry_required(self):
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self.counter = 0
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@comm_utils.RetryDecorator(exceptions.RequestTimeout, interval=2,
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retries=3, 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(self.sleep_fn.called)
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self.assertEqual(ret, 'success')
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self.assertEqual(self.counter, 1)
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def test_retry_zero_times(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 = 0
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@comm_utils.RetryDecorator(exceptions.RequestTimeout, interval,
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retries, backoff_rate)
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def always_fails():
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self.counter += 1
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raise exceptions.RequestTimeout()
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self.assertRaises(exceptions.RequestTimeout, always_fails)
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self.assertEqual(self.counter, 1)
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self.assertFalse(self.sleep_fn.called)
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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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@comm_utils.RetryDecorator(exceptions.RequestTimeout, interval,
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retries, 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 exceptions.RequestTimeout()
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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(self.sleep_fn.call_count, 1)
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self.sleep_fn.assert_called_with(interval)
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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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@comm_utils.RetryDecorator(exceptions.RequestTimeout, interval,
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retries, backoff_rate)
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def always_fails():
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self.counter += 1
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raise exceptions.RequestTimeout()
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self.assertRaises(exceptions.RequestTimeout, always_fails)
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self.assertEqual(self.counter, retries + 1)
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self.assertEqual(self.sleep_fn.call_count, retries)
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expected_sleep_fn_arg = []
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for i in range(retries):
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expected_sleep_fn_arg.append(interval)
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interval *= backoff_rate
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self.sleep_fn.assert_has_calls(map(mock.call, expected_sleep_fn_arg))
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def test_limit_is_reached_with_conf(self):
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self.counter = 0
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@comm_utils.RetryDecorator(exceptions.RequestTimeout)
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def always_fails():
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self.counter += 1
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raise exceptions.RequestTimeout()
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retry = cfg.CONF.ESWITCH.retries
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interval = cfg.CONF.ESWITCH.request_timeout / 1000
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delay_rate = cfg.CONF.ESWITCH.backoff_rate
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expected_sleep_fn_arg = []
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for i in range(retry):
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expected_sleep_fn_arg.append(interval)
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interval *= delay_rate
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self.assertRaises(exceptions.RequestTimeout, always_fails)
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self.assertEqual(self.counter, retry + 1)
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self.assertEqual(self.sleep_fn.call_count, retry)
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self.sleep_fn.assert_has_calls(map(mock.call, expected_sleep_fn_arg))
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def test_wrong_exception_no_retry(self):
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@comm_utils.RetryDecorator(exceptions.RequestTimeout)
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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(self.sleep_fn.called)
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