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# Copyright (c) 2015 OpenStack Foundation
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import mock
from neutron.tests import base
from networking_odl.common import cache
from networking_odl.common import utils
class TestGetAddressesByName(base.DietTestCase):
# pylint: disable=protected-access, unused-argument
def setUp(self):
super(TestGetAddressesByName, self).setUp()
self.clear_cache()
self.addCleanup(self.clear_cache)
time = self.patch(
utils.cache, 'time', clock=mock.Mock(return_value=0.0))
self.clock = time.clock
socket = self.patch(utils, 'socket')
self.getaddrinfo = socket.getaddrinfo
def patch(self, target, name, *args, **kwargs):
context = mock.patch.object(target, name, *args, **kwargs)
mocked = context.start()
self.addCleanup(context.stop)
return mocked
def clear_cache(self):
utils._addresses_by_name_cache.clear()
def test_get_addresses_by_valid_name(self):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result)
# Then fetched addresses are cached
self.assertEqual(result, utils.get_addresses_by_name('some_host_name'))
# Then addresses are fetched only once
self.getaddrinfo.assert_called_once_with('some_host_name', None)
def test_get_addresses_by_valid_name_when_cache_expires(self):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# When valid host name is requested
result1 = utils.get_addresses_by_name('some_host_name')
# and after a long time
self.clock.return_value = 1.0e6
# When valid host name is requested
result2 = utils.get_addresses_by_name('some_host_name')
# Then correct addresses are returned
self.assertEqual(('127.0.0.1', '10.237.214.247'), result1)
self.assertEqual(('127.0.0.1', '10.237.214.247'), result2)
# Then addresses are fetched twice
self.getaddrinfo.assert_has_calls(
[mock.call('some_host_name', None),
mock.call('some_host_name', None)])
@mock.patch.object(cache, 'LOG')
def test_get_addresses_by_invalid_name(self, cache_logger):
# Given addresses resolution is failing
given_error = RuntimeError("I don't know him!")
def failing_getaddrinfo(name, service):
raise given_error
self.getaddrinfo.side_effect = failing_getaddrinfo
# When invalid name is requested
self.assertRaises(
RuntimeError, utils.get_addresses_by_name, 'some_host_name')
# When invalid name is requested again
self.assertRaises(
RuntimeError, utils.get_addresses_by_name, 'some_host_name')
# Then result is fetched only once
self.getaddrinfo.assert_has_calls(
[mock.call('some_host_name', None)])
cache_logger.warning.assert_has_calls(
[mock.call(
'Error fetching values for keys: %r', "'some_host_name'",
exc_info=(RuntimeError, given_error, mock.ANY)),
mock.call(
'Error fetching values for keys: %r', "'some_host_name'",
exc_info=(RuntimeError, given_error, mock.ANY))])
@mock.patch.object(cache, 'LOG')
def test_get_addresses_failing_when_expired_in_cache(self, cache_logger):
self.getaddrinfo.return_value = [
(2, 1, 6, '', ('127.0.0.1', 0)),
(2, 2, 17, '', ('127.0.0.1', 0)),
(2, 3, 0, '', ('127.0.0.1', 0)),
(2, 1, 6, '', ('10.237.214.247', 0)),
(2, 2, 17, '', ('10.237.214.247', 0)),
(2, 3, 0, '', ('10.237.214.247', 0))]
# Given valid result is in chache but expired
utils.get_addresses_by_name('some_host_name')
self.clock.return_value = 1.0e6
# Given addresses resolution is now failing
given_error = RuntimeError("This is top secret.")
def failing_getaddrinfo(name, service):
raise given_error
self.getaddrinfo.side_effect = failing_getaddrinfo
self.assertRaises(
RuntimeError, utils.get_addresses_by_name, 'some_host_name')
# Then result is fetched more times
self.getaddrinfo.assert_has_calls(
[mock.call('some_host_name', None),
mock.call('some_host_name', None)])
cache_logger.warning.assert_called_once_with(
'Error fetching values for keys: %r', "'some_host_name'",
exc_info=(RuntimeError, given_error, mock.ANY))
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