Merge "Test for disabling greendns" into stable/train
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# Copyright 2020 Red Hat, 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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# NOTE(artom) This file exists to test eventlet monkeypatching. How and what
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# eventlet monkeypatches can be controlled by environment variables that
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# are processed by eventlet at import-time (for exmaple, EVENTLET_NO_GREENDNS).
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# Nova manages all of this in nova.monkey_patch. Therefore, nova.monkey_patch
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# must be the first thing to import eventlet. As nova.tests.functional.__init__
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# imports nova.monkey_patch, we're OK here.
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import socket
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import traceback
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from nova import test
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class TestMonkeyPatch(test.TestCase):
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def test_greendns_is_disabled(self):
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"""Try to resolve a fake fqdn. If we see greendns mentioned in the
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traceback of the raised exception, it means we've not actually disabled
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greendns. See the TODO and NOTE in nova.monkey_patch to understand why
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greendns needs to be disabled.
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"""
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raised = False
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try:
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socket.gethostbyname('goat.fake')
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except Exception:
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tb = traceback.format_exc()
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# NOTE(artom) If we've correctly disabled greendns, we expect the
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# traceback to not contain any reference to it.
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self.assertNotIn('greendns.py', tb)
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raised = True
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self.assertTrue(raised)
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