bd25174338
Using DynamicLoopingCall involved a few hacks to make it work properly. This new BackOffLoopingCall will start an exponential backoff (with a configurable jitter) when there is a failure. The backoff will continue until the given function returns True or timeout is about to be exceeded. The function will run indefinitely until either an exception is raised or timeout is reached. I plan to merge this into oslo loopingcall and switch the heartbeat to this. Change-Id: I1482348e98c6b68c34b3003645029e08135b1341
101 lines
3.9 KiB
Python
101 lines
3.9 KiB
Python
# Copyright 2014 Rackspace, Inc.
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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 unittest
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import mock
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from ironic_python_agent import backoff
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from ironic_python_agent.openstack.common import loopingcall
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class TestBackOffLoopingCall(unittest.TestCase):
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@mock.patch('random.gauss')
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@mock.patch('eventlet.greenthread.sleep')
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def test_exponential_backoff(self, sleep_mock, random_mock):
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def false():
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return False
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random_mock.return_value = .8
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self.assertRaises(backoff.LoopingCallTimeOut,
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backoff.BackOffLoopingCall(false).start()
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.wait)
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expected_times = [mock.call(1.6000000000000001),
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mock.call(2.5600000000000005),
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mock.call(4.096000000000001),
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mock.call(6.5536000000000021),
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mock.call(10.485760000000004),
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mock.call(16.777216000000006),
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mock.call(26.843545600000013),
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mock.call(42.949672960000022),
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mock.call(68.719476736000033),
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mock.call(109.95116277760006)]
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self.assertEqual(expected_times, sleep_mock.call_args_list)
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@mock.patch('random.gauss')
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@mock.patch('eventlet.greenthread.sleep')
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def test_no_backoff(self, sleep_mock, random_mock):
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random_mock.return_value = 1
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func = mock.Mock()
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# func.side_effect
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func.side_effect = [True, True, True, loopingcall.LoopingCallDone(
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retvalue='return value')]
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retvalue = backoff.BackOffLoopingCall(func).start().wait()
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expected_times = [mock.call(1), mock.call(1), mock.call(1)]
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self.assertEqual(expected_times, sleep_mock.call_args_list)
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self.assertTrue(retvalue, 'return value')
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@mock.patch('random.gauss')
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@mock.patch('eventlet.greenthread.sleep')
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def test_no_sleep(self, sleep_mock, random_mock):
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# Any call that executes properly the first time shouldn't sleep
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random_mock.return_value = 1
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func = mock.Mock()
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# func.side_effect
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func.side_effect = loopingcall.LoopingCallDone(retvalue='return value')
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retvalue = backoff.BackOffLoopingCall(func).start().wait()
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self.assertFalse(sleep_mock.called)
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self.assertTrue(retvalue, 'return value')
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@mock.patch('random.gauss')
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@mock.patch('eventlet.greenthread.sleep')
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def test_max_interval(self, sleep_mock, random_mock):
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def false():
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return False
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random_mock.return_value = .8
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self.assertRaises(backoff.LoopingCallTimeOut,
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backoff.BackOffLoopingCall(false).start(
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max_interval=60)
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.wait)
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expected_times = [mock.call(1.6000000000000001),
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mock.call(2.5600000000000005),
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mock.call(4.096000000000001),
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mock.call(6.5536000000000021),
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mock.call(10.485760000000004),
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mock.call(16.777216000000006),
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mock.call(26.843545600000013),
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mock.call(42.949672960000022),
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mock.call(60),
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mock.call(60),
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mock.call(60)]
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self.assertEqual(expected_times, sleep_mock.call_args_list)
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