diff options
Diffstat (limited to 'tests/http/federation/test_srv_resolver.py')
| -rw-r--r-- | tests/http/federation/test_srv_resolver.py | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/tests/http/federation/test_srv_resolver.py b/tests/http/federation/test_srv_resolver.py new file mode 100644 index 0000000000..1271a495e1 --- /dev/null +++ b/tests/http/federation/test_srv_resolver.py @@ -0,0 +1,209 @@ +# -*- coding: utf-8 -*- +# Copyright 2014-2016 OpenMarket Ltd +# Copyright 2019 New Vector Ltd +# +# 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. + +from mock import Mock + +from twisted.internet import defer +from twisted.internet.defer import Deferred +from twisted.internet.error import ConnectError +from twisted.names import dns, error + +from synapse.http.federation.srv_resolver import resolve_service +from synapse.util.logcontext import LoggingContext + +from tests import unittest +from tests.utils import MockClock + + +class SrvResolverTestCase(unittest.TestCase): + def test_resolve(self): + dns_client_mock = Mock() + + service_name = b"test_service.example.com" + host_name = b"example.com" + + answer_srv = dns.RRHeader( + type=dns.SRV, payload=dns.Record_SRV(target=host_name) + ) + + result_deferred = Deferred() + dns_client_mock.lookupService.return_value = result_deferred + + cache = {} + + @defer.inlineCallbacks + def do_lookup(): + with LoggingContext("one") as ctx: + resolve_d = resolve_service( + service_name, dns_client=dns_client_mock, cache=cache + ) + + self.assertNoResult(resolve_d) + + # should have reset to the sentinel context + self.assertIs(LoggingContext.current_context(), LoggingContext.sentinel) + + result = yield resolve_d + + # should have restored our context + self.assertIs(LoggingContext.current_context(), ctx) + + defer.returnValue(result) + + test_d = do_lookup() + self.assertNoResult(test_d) + + dns_client_mock.lookupService.assert_called_once_with(service_name) + + result_deferred.callback( + ([answer_srv], None, None) + ) + + servers = self.successResultOf(test_d) + + self.assertEquals(len(servers), 1) + self.assertEquals(servers, cache[service_name]) + self.assertEquals(servers[0].host, host_name) + + @defer.inlineCallbacks + def test_from_cache_expired_and_dns_fail(self): + dns_client_mock = Mock() + dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError()) + + service_name = "test_service.example.com" + + entry = Mock(spec_set=["expires"]) + entry.expires = 0 + + cache = {service_name: [entry]} + + servers = yield resolve_service( + service_name, dns_client=dns_client_mock, cache=cache + ) + + dns_client_mock.lookupService.assert_called_once_with(service_name) + + self.assertEquals(len(servers), 1) + self.assertEquals(servers, cache[service_name]) + + @defer.inlineCallbacks + def test_from_cache(self): + clock = MockClock() + + dns_client_mock = Mock(spec_set=['lookupService']) + dns_client_mock.lookupService = Mock(spec_set=[]) + + service_name = "test_service.example.com" + + entry = Mock(spec_set=["expires"]) + entry.expires = 999999999 + + cache = {service_name: [entry]} + + servers = yield resolve_service( + service_name, dns_client=dns_client_mock, cache=cache, clock=clock + ) + + self.assertFalse(dns_client_mock.lookupService.called) + + self.assertEquals(len(servers), 1) + self.assertEquals(servers, cache[service_name]) + + @defer.inlineCallbacks + def test_empty_cache(self): + dns_client_mock = Mock() + + dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError()) + + service_name = "test_service.example.com" + + cache = {} + + with self.assertRaises(error.DNSServerError): + yield resolve_service(service_name, dns_client=dns_client_mock, cache=cache) + + @defer.inlineCallbacks + def test_name_error(self): + dns_client_mock = Mock() + + dns_client_mock.lookupService.return_value = defer.fail(error.DNSNameError()) + + service_name = "test_service.example.com" + + cache = {} + + servers = yield resolve_service( + service_name, dns_client=dns_client_mock, cache=cache + ) + + self.assertEquals(len(servers), 0) + self.assertEquals(len(cache), 0) + + def test_disabled_service(self): + """ + test the behaviour when there is a single record which is ".". + """ + service_name = b"test_service.example.com" + + lookup_deferred = Deferred() + dns_client_mock = Mock() + dns_client_mock.lookupService.return_value = lookup_deferred + cache = {} + + resolve_d = resolve_service( + service_name, dns_client=dns_client_mock, cache=cache + ) + self.assertNoResult(resolve_d) + + # returning a single "." should make the lookup fail with a ConenctError + lookup_deferred.callback(( + [dns.RRHeader(type=dns.SRV, payload=dns.Record_SRV(target=b"."))], + None, + None, + )) + + self.failureResultOf(resolve_d, ConnectError) + + def test_non_srv_answer(self): + """ + test the behaviour when the dns server gives us a spurious non-SRV response + """ + service_name = b"test_service.example.com" + + lookup_deferred = Deferred() + dns_client_mock = Mock() + dns_client_mock.lookupService.return_value = lookup_deferred + cache = {} + + resolve_d = resolve_service( + service_name, dns_client=dns_client_mock, cache=cache + ) + self.assertNoResult(resolve_d) + + lookup_deferred.callback(( + [ + dns.RRHeader(type=dns.A, payload=dns.Record_A()), + dns.RRHeader(type=dns.SRV, payload=dns.Record_SRV(target=b"host")), + ], + None, + None, + )) + + servers = self.successResultOf(resolve_d) + + self.assertEquals(len(servers), 1) + self.assertEquals(servers, cache[service_name]) + self.assertEquals(servers[0].host, b"host") |