def test_empty_cache(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(error.DNSServerError())
service_name = b"test_service.example.com"
cache = {}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
with self.assertRaises(error.DNSServerError):
yield defer.ensureDeferred(resolver.resolve_service(service_name))
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
)
def test_from_cache(self):
dns_client_mock = Mock()
dns_client_mock.lookupService.return_value = defer.fail(
error.DNSServerError())
service_name = "test_service.examle.com"
cache = {service_name: [object()]}
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])
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 = b"test_service.example.com"
entry = Mock(spec_set=["expires"])
entry.expires = 0
cache = {service_name: [entry]}
resolver = SrvResolver(dns_client=dns_client_mock, cache=cache)
servers = yield resolver.resolve_service(service_name)
dns_client_mock.lookupService.assert_called_once_with(service_name)
self.assertEquals(len(servers), 1)
self.assertEquals(servers, cache[service_name])
def _lookup(self, name, cls, qtype, timeout):
return defer.fail(error.DNSServerError([]))
