mirror of
https://github.com/element-hq/synapse.git
synced 2024-11-25 02:55:46 +03:00
217 lines
7.6 KiB
Python
217 lines
7.6 KiB
Python
# 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 typing import Dict, Generator, List, Tuple, cast
|
|
from unittest.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 Server, SrvResolver
|
|
from synapse.logging.context import LoggingContext, current_context
|
|
|
|
from tests import unittest
|
|
from tests.utils import MockClock
|
|
|
|
|
|
class SrvResolverTestCase(unittest.TestCase):
|
|
def test_resolve(self) -> None:
|
|
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[Tuple[List[dns.RRHeader], None, None]]" = Deferred()
|
|
dns_client_mock.lookupService.return_value = result_deferred
|
|
|
|
cache: Dict[bytes, List[Server]] = {}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
@defer.inlineCallbacks
|
|
def do_lookup() -> Generator["Deferred[object]", object, List[Server]]:
|
|
with LoggingContext("one") as ctx:
|
|
resolve_d = resolver.resolve_service(service_name)
|
|
result: List[Server]
|
|
result = yield defer.ensureDeferred(resolve_d) # type: ignore[assignment]
|
|
|
|
# should have restored our context
|
|
self.assertIs(current_context(), ctx)
|
|
|
|
return 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.assertEqual(len(servers), 1)
|
|
self.assertEqual(servers, cache[service_name])
|
|
self.assertEqual(servers[0].host, host_name)
|
|
|
|
@defer.inlineCallbacks
|
|
def test_from_cache_expired_and_dns_fail(
|
|
self,
|
|
) -> Generator["Deferred[object]", object, None]:
|
|
dns_client_mock = Mock()
|
|
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
|
|
|
|
service_name = b"test_service.example.com"
|
|
|
|
entry = Mock(spec_set=["expires", "priority", "weight"])
|
|
entry.expires = 0
|
|
entry.priority = 0
|
|
entry.weight = 0
|
|
|
|
cache = {service_name: [cast(Server, entry)]}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
servers: List[Server]
|
|
servers = yield defer.ensureDeferred(
|
|
resolver.resolve_service(service_name)
|
|
) # type: ignore[assignment]
|
|
|
|
dns_client_mock.lookupService.assert_called_once_with(service_name)
|
|
|
|
self.assertEqual(len(servers), 1)
|
|
self.assertEqual(servers, cache[service_name])
|
|
|
|
@defer.inlineCallbacks
|
|
def test_from_cache(self) -> Generator["Deferred[object]", object, None]:
|
|
clock = MockClock()
|
|
|
|
dns_client_mock = Mock(spec_set=["lookupService"])
|
|
dns_client_mock.lookupService = Mock(spec_set=[])
|
|
|
|
service_name = b"test_service.example.com"
|
|
|
|
entry = Mock(spec_set=["expires", "priority", "weight"])
|
|
entry.expires = 999999999
|
|
entry.priority = 0
|
|
entry.weight = 0
|
|
|
|
cache = {service_name: [cast(Server, entry)]}
|
|
resolver = SrvResolver(
|
|
dns_client=dns_client_mock, cache=cache, get_time=clock.time
|
|
)
|
|
|
|
servers: List[Server]
|
|
servers = yield defer.ensureDeferred(
|
|
resolver.resolve_service(service_name)
|
|
) # type: ignore[assignment]
|
|
|
|
self.assertFalse(dns_client_mock.lookupService.called)
|
|
|
|
self.assertEqual(len(servers), 1)
|
|
self.assertEqual(servers, cache[service_name])
|
|
|
|
@defer.inlineCallbacks
|
|
def test_empty_cache(self) -> Generator["Deferred[object]", object, None]:
|
|
dns_client_mock = Mock()
|
|
|
|
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
|
|
|
|
service_name = b"test_service.example.com"
|
|
|
|
cache: Dict[bytes, List[Server]] = {}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
with self.assertRaises(error.DNSServerError):
|
|
yield defer.ensureDeferred(resolver.resolve_service(service_name))
|
|
|
|
@defer.inlineCallbacks
|
|
def test_name_error(self) -> Generator["Deferred[object]", object, None]:
|
|
dns_client_mock = Mock()
|
|
|
|
dns_client_mock.lookupService.return_value = defer.fail(error.DNSNameError())
|
|
|
|
service_name = b"test_service.example.com"
|
|
|
|
cache: Dict[bytes, List[Server]] = {}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
servers: List[Server]
|
|
servers = yield defer.ensureDeferred(
|
|
resolver.resolve_service(service_name)
|
|
) # type: ignore[assignment]
|
|
|
|
self.assertEqual(len(servers), 0)
|
|
self.assertEqual(len(cache), 0)
|
|
|
|
def test_disabled_service(self) -> None:
|
|
"""
|
|
test the behaviour when there is a single record which is ".".
|
|
"""
|
|
service_name = b"test_service.example.com"
|
|
|
|
lookup_deferred: "Deferred[Tuple[List[dns.RRHeader], None, None]]" = Deferred()
|
|
dns_client_mock = Mock()
|
|
dns_client_mock.lookupService.return_value = lookup_deferred
|
|
cache: Dict[bytes, List[Server]] = {}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
# Old versions of Twisted don't have an ensureDeferred in failureResultOf.
|
|
resolve_d = defer.ensureDeferred(resolver.resolve_service(service_name))
|
|
|
|
# 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) -> None:
|
|
"""
|
|
test the behaviour when the dns server gives us a spurious non-SRV response
|
|
"""
|
|
service_name = b"test_service.example.com"
|
|
|
|
lookup_deferred: "Deferred[Tuple[List[dns.RRHeader], None, None]]" = Deferred()
|
|
dns_client_mock = Mock()
|
|
dns_client_mock.lookupService.return_value = lookup_deferred
|
|
cache: Dict[bytes, List[Server]] = {}
|
|
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
|
|
|
|
# Old versions of Twisted don't have an ensureDeferred in successResultOf.
|
|
resolve_d = defer.ensureDeferred(resolver.resolve_service(service_name))
|
|
|
|
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.assertEqual(len(servers), 1)
|
|
self.assertEqual(servers, cache[service_name])
|
|
self.assertEqual(servers[0].host, b"host")
|