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# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket 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 . import unittest
from twisted.internet import defer
from twisted.names import dns, error
from mock import Mock
from synapse.http.endpoint import resolve_service
from tests.utils import MockClock
@unittest.DEBUG
class DnsTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_resolve(self):
dns_client_mock = Mock()
service_name = "test_service.example.com"
host_name = "example.com"
ip_address = "127.0.0.1"
ip6_address = "::1"
answer_srv = dns.RRHeader(
type=dns.SRV,
payload=dns.Record_SRV(
target=host_name,
)
)
answer_a = dns.RRHeader(
type=dns.A,
payload=dns.Record_A(
address=ip_address,
)
)
answer_aaaa = dns.RRHeader(
type=dns.AAAA,
payload=dns.Record_AAAA(
address=ip6_address,
)
)
dns_client_mock.lookupService.return_value = defer.succeed(
([answer_srv], None, None),
)
dns_client_mock.lookupAddress.return_value = defer.succeed(
([answer_a], None, None),
)
dns_client_mock.lookupIPV6Address.return_value = defer.succeed(
([answer_aaaa], None, None),
)
cache = {}
servers = yield resolve_service(
service_name, dns_client=dns_client_mock, cache=cache
)
dns_client_mock.lookupService.assert_called_once_with(service_name)
dns_client_mock.lookupAddress.assert_called_once_with(host_name)
dns_client_mock.lookupIPV6Address.assert_called_once_with(host_name)
self.assertEquals(len(servers), 2)
self.assertEquals(servers, cache[service_name])
self.assertEquals(servers[0].host, ip_address)
self.assertEquals(servers[1].host, ip6_address)
@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.examle.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.examle.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.examle.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.examle.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)
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