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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Test cases for L{twisted.names.srvconnect}.
"""
from twisted.internet import defer, protocol
from twisted.names import client, dns, srvconnect
from twisted.names.common import ResolverBase
from twisted.names.error import DNSNameError
from twisted.internet.error import DNSLookupError, ServiceNameUnknownError
from twisted.trial import unittest
from twisted.test.proto_helpers import MemoryReactor
class FakeResolver(ResolverBase):
"""
Resolver that only gives out one given result.
Either L{results} or L{failure} must be set and will be used for
the return value of L{_lookup}
@ivar results: List of L{dns.RRHeader} for the desired result.
@type results: C{list}
@ivar failure: Failure with an exception from L{twisted.names.error}.
@type failure: L{Failure<twisted.python.failure.Failure>}
"""
def __init__(self, results=None, failure=None):
self.results = results
self.failure = failure
def _lookup(self, name, cls, qtype, timeout):
"""
Return the result or failure on lookup.
"""
if self.results is not None:
return defer.succeed((self.results, [], []))
else:
return defer.fail(self.failure)
class DummyFactory(protocol.ClientFactory):
"""
Dummy client factory that stores the reason of connection failure.
"""
def __init__(self):
self.reason = None
def clientConnectionFailed(self, connector, reason):
self.reason = reason
class SRVConnectorTest(unittest.TestCase):
"""
Tests for L{srvconnect.SRVConnector}.
"""
def setUp(self):
self.patch(client, 'theResolver', FakeResolver())
self.reactor = MemoryReactor()
self.factory = DummyFactory()
self.connector = srvconnect.SRVConnector(self.reactor, 'xmpp-server',
'example.org', self.factory)
def test_SRVPresent(self):
"""
Test connectTCP gets called with the address from the SRV record.
"""
payload = dns.Record_SRV(port=6269, target='host.example.org', ttl=60)
client.theResolver.results = [dns.RRHeader(name='example.org',
type=dns.SRV,
cls=dns.IN, ttl=60,
payload=payload)]
self.connector.connect()
self.assertIdentical(None, self.factory.reason)
self.assertEqual(
self.reactor.tcpClients.pop()[:2], ('host.example.org', 6269))
def test_SRVNotPresent(self):
"""
Test connectTCP gets called with fallback parameters on NXDOMAIN.
"""
client.theResolver.failure = DNSNameError('example.org')
self.connector.connect()
self.assertIdentical(None, self.factory.reason)
self.assertEqual(
self.reactor.tcpClients.pop()[:2], ('example.org', 'xmpp-server'))
def test_SRVNoResult(self):
"""
Test connectTCP gets called with fallback parameters on empty result.
"""
client.theResolver.results = []
self.connector.connect()
self.assertIdentical(None, self.factory.reason)
self.assertEqual(
self.reactor.tcpClients.pop()[:2], ('example.org', 'xmpp-server'))
def test_SRVNoResultUnknownServiceDefaultPort(self):
"""
connectTCP gets called with default port if the service is not defined.
"""
self.connector = srvconnect.SRVConnector(self.reactor,
'thisbetternotexist',
'example.org', self.factory,
defaultPort=5222)
client.theResolver.failure = ServiceNameUnknownError()
self.connector.connect()
self.assertIdentical(None, self.factory.reason)
self.assertEqual(
self.reactor.tcpClients.pop()[:2], ('example.org', 5222))
def test_SRVNoResultUnknownServiceNoDefaultPort(self):
"""
Connect fails on no result, unknown service and no default port.
"""
self.connector = srvconnect.SRVConnector(self.reactor,
'thisbetternotexist',
'example.org', self.factory)
client.theResolver.failure = ServiceNameUnknownError()
self.connector.connect()
self.assertTrue(self.factory.reason.check(ServiceNameUnknownError))
def test_SRVBadResult(self):
"""
Test connectTCP gets called with fallback parameters on bad result.
"""
client.theResolver.results = [dns.RRHeader(name='example.org',
type=dns.CNAME,
cls=dns.IN, ttl=60,
payload=None)]
self.connector.connect()
self.assertIdentical(None, self.factory.reason)
self.assertEqual(
self.reactor.tcpClients.pop()[:2], ('example.org', 'xmpp-server'))
def test_SRVNoService(self):
"""
Test that connecting fails when no service is present.
"""
payload = dns.Record_SRV(port=5269, target='.', ttl=60)
client.theResolver.results = [dns.RRHeader(name='example.org',
type=dns.SRV,
cls=dns.IN, ttl=60,
payload=payload)]
self.connector.connect()
self.assertNotIdentical(None, self.factory.reason)
self.factory.reason.trap(DNSLookupError)
self.assertEqual(self.reactor.tcpClients, [])
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