140 lines
3.8 KiB
Python
140 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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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 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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from mock import Mock
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from twisted.internet import defer
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from twisted.names import dns, error
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from synapse.http.endpoint import resolve_service
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from tests.utils import MockClock
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from . import unittest
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@unittest.DEBUG
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class DnsTestCase(unittest.TestCase):
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@defer.inlineCallbacks
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def test_resolve(self):
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dns_client_mock = Mock()
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service_name = "test_service.example.com"
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host_name = "example.com"
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answer_srv = dns.RRHeader(
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type=dns.SRV,
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payload=dns.Record_SRV(
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target=host_name,
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)
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)
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dns_client_mock.lookupService.return_value = defer.succeed(
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([answer_srv], None, None),
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)
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cache = {}
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servers = yield resolve_service(
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service_name, dns_client=dns_client_mock, cache=cache
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)
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dns_client_mock.lookupService.assert_called_once_with(service_name)
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self.assertEquals(len(servers), 1)
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self.assertEquals(servers, cache[service_name])
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self.assertEquals(servers[0].host, host_name)
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@defer.inlineCallbacks
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def test_from_cache_expired_and_dns_fail(self):
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dns_client_mock = Mock()
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dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
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service_name = "test_service.example.com"
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entry = Mock(spec_set=["expires"])
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entry.expires = 0
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cache = {
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service_name: [entry]
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}
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servers = yield resolve_service(
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service_name, dns_client=dns_client_mock, cache=cache
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)
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dns_client_mock.lookupService.assert_called_once_with(service_name)
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self.assertEquals(len(servers), 1)
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self.assertEquals(servers, cache[service_name])
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@defer.inlineCallbacks
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def test_from_cache(self):
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clock = MockClock()
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dns_client_mock = Mock(spec_set=['lookupService'])
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dns_client_mock.lookupService = Mock(spec_set=[])
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service_name = "test_service.example.com"
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entry = Mock(spec_set=["expires"])
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entry.expires = 999999999
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cache = {
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service_name: [entry]
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}
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servers = yield resolve_service(
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service_name, dns_client=dns_client_mock, cache=cache, clock=clock,
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)
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self.assertFalse(dns_client_mock.lookupService.called)
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self.assertEquals(len(servers), 1)
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self.assertEquals(servers, cache[service_name])
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@defer.inlineCallbacks
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def test_empty_cache(self):
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dns_client_mock = Mock()
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dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
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service_name = "test_service.example.com"
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cache = {}
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with self.assertRaises(error.DNSServerError):
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yield resolve_service(
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service_name, dns_client=dns_client_mock, cache=cache
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)
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@defer.inlineCallbacks
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def test_name_error(self):
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dns_client_mock = Mock()
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dns_client_mock.lookupService.return_value = defer.fail(error.DNSNameError())
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service_name = "test_service.example.com"
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cache = {}
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servers = yield resolve_service(
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service_name, dns_client=dns_client_mock, cache=cache
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)
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self.assertEquals(len(servers), 0)
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self.assertEquals(len(cache), 0)
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