Ausgabe der neuen DB Einträge
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hubobel
parent
bad48e1627
commit
cfbbb9ee3d
2399 changed files with 843193 additions and 43 deletions
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Tests for implementations of L{IHostnameResolver} and their interactions with
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reactor implementations.
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"""
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from __future__ import division, absolute_import
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__metaclass__ = type
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from collections import defaultdict
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from socket import (
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getaddrinfo, gaierror, EAI_NONAME, AF_INET, AF_INET6, AF_UNSPEC,
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SOCK_STREAM, SOCK_DGRAM, IPPROTO_TCP
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)
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from threading import local, Lock
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from zope.interface import implementer
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from zope.interface.verify import verifyObject
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from twisted.internet.interfaces import (
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IResolutionReceiver, IResolverSimple, IReactorPluggableNameResolver,
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IHostnameResolver,
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)
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from twisted.trial.unittest import (
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SynchronousTestCase as UnitTest
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)
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from twisted.python.threadpool import ThreadPool
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from twisted._threads import createMemoryWorker, Team, LockWorker
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from twisted.internet.address import IPv4Address, IPv6Address
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from twisted.internet._resolver import (
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GAIResolver, SimpleResolverComplexifier, ComplexResolverSimplifier
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)
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from twisted.internet.defer import Deferred
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from twisted.internet.error import DNSLookupError
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from twisted.internet.base import (
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PluggableResolverMixin,
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ReactorBase,
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)
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class DeterministicThreadPool(ThreadPool, object):
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"""
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Create a deterministic L{ThreadPool} object.
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"""
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def __init__(self, team):
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"""
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Create a L{DeterministicThreadPool} from a L{Team}.
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"""
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self.min = 1
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self.max = 1
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self.name = None
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self.threads = []
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self._team = team
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def deterministicPool():
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"""
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Create a deterministic threadpool.
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@return: 2-tuple of L{ThreadPool}, 0-argument C{work} callable; when
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C{work} is called, do the work.
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"""
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worker, doer = createMemoryWorker()
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return (
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DeterministicThreadPool(Team(LockWorker(Lock(), local()),
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(lambda: worker), lambda: None)),
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doer
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)
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def deterministicReactorThreads():
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"""
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Create a deterministic L{IReactorThreads}
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@return: a 2-tuple consisting of an L{IReactorThreads}-like object and a
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0-argument callable that will perform one unit of work invoked via that
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object's C{callFromThread} method.
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"""
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worker, doer = createMemoryWorker()
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class CFT(object):
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def callFromThread(self, f, *a, **k):
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worker.do(lambda: f(*a, **k))
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return CFT(), doer
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class FakeAddrInfoGetter(object):
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"""
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Test object implementing getaddrinfo.
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"""
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def __init__(self):
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"""
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Create a L{FakeAddrInfoGetter}.
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"""
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self.calls = []
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self.results = defaultdict(list)
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def getaddrinfo(self, host, port, family=0, socktype=0, proto=0, flags=0):
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"""
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Mock for L{socket.getaddrinfo}.
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@param host: see L{socket.getaddrinfo}
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@param port: see L{socket.getaddrinfo}
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@param family: see L{socket.getaddrinfo}
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@param socktype: see L{socket.getaddrinfo}
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@param proto: see L{socket.getaddrinfo}
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@param flags: see L{socket.getaddrinfo}
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@return: L{socket.getaddrinfo}
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"""
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self.calls.append((host, port, family, socktype, proto, flags))
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results = self.results[host]
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if results:
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return results
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else:
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raise gaierror(EAI_NONAME,
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'nodename nor servname provided, or not known')
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def addResultForHost(self, host, sockaddr, family=AF_INET,
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socktype=SOCK_STREAM, proto=IPPROTO_TCP,
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canonname=b""):
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"""
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Add a result for a given hostname. When this hostname is resolved, the
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result will be a L{list} of all results C{addResultForHost} has been
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called with using that hostname so far.
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@param host: The hostname to give this result for. This will be the
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next result from L{FakeAddrInfoGetter.getaddrinfo} when passed this
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host.
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@type canonname: native L{str}
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@param sockaddr: The resulting socket address; should be a 2-tuple for
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IPv4 or a 4-tuple for IPv6.
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@param family: An C{AF_*} constant that will be returned from
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C{getaddrinfo}.
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@param socktype: A C{SOCK_*} constant that will be returned from
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C{getaddrinfo}.
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@param proto: An C{IPPROTO_*} constant that will be returned from
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C{getaddrinfo}.
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@param canonname: A canonical name that will be returned from
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C{getaddrinfo}.
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@type canonname: native L{str}
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"""
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self.results[host].append(
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(family, socktype, proto, canonname, sockaddr)
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)
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@implementer(IResolutionReceiver)
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class ResultHolder(object):
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"""
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A resolution receiver which holds onto the results it received.
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"""
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_started = False
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_ended = False
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def __init__(self, testCase):
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"""
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Create a L{ResultHolder} with a L{UnitTest}.
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"""
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self._testCase = testCase
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def resolutionBegan(self, hostResolution):
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"""
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Hostname resolution began.
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@param hostResolution: see L{IResolutionReceiver}
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"""
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self._started = True
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self._resolution = hostResolution
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self._addresses = []
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def addressResolved(self, address):
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"""
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An address was resolved.
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@param address: see L{IResolutionReceiver}
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"""
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self._addresses.append(address)
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def resolutionComplete(self):
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"""
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Hostname resolution is complete.
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"""
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self._ended = True
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class HelperTests(UnitTest):
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"""
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Tests for error cases of helpers used in this module.
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"""
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def test_logErrorsInThreads(self):
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"""
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L{DeterministicThreadPool} will log any exceptions that its "thread"
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workers encounter.
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"""
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self.pool, self.doThreadWork = deterministicPool()
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def divideByZero():
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return 1 / 0
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self.pool.callInThread(divideByZero)
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self.doThreadWork()
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self.assertEqual(len(self.flushLoggedErrors(ZeroDivisionError)), 1)
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class HostnameResolutionTests(UnitTest):
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"""
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Tests for hostname resolution.
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"""
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def setUp(self):
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"""
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Set up a L{GAIResolver}.
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"""
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self.pool, self.doThreadWork = deterministicPool()
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self.reactor, self.doReactorWork = deterministicReactorThreads()
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self.getter = FakeAddrInfoGetter()
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self.resolver = GAIResolver(self.reactor, lambda: self.pool,
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self.getter.getaddrinfo)
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def test_resolveOneHost(self):
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"""
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Resolving an individual hostname that results in one address from
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getaddrinfo results in a single call each to C{resolutionBegan},
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C{addressResolved}, and C{resolutionComplete}.
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"""
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receiver = ResultHolder(self)
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self.getter.addResultForHost(u"sample.example.com", ("4.3.2.1", 0))
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resolution = self.resolver.resolveHostName(receiver,
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u"sample.example.com")
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self.assertIs(receiver._resolution, resolution)
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, False)
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self.doThreadWork()
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self.doReactorWork()
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self.assertEqual(receiver._ended, True)
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self.assertEqual(receiver._addresses,
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[IPv4Address('TCP', '4.3.2.1', 0)])
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def test_resolveOneIPv6Host(self):
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"""
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Resolving an individual hostname that results in one address from
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getaddrinfo results in a single call each to C{resolutionBegan},
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C{addressResolved}, and C{resolutionComplete}; C{addressResolved} will
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receive an L{IPv6Address}.
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"""
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receiver = ResultHolder(self)
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flowInfo = 1
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scopeID = 2
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self.getter.addResultForHost(u"sample.example.com",
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("::1", 0, flowInfo, scopeID),
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family=AF_INET6)
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resolution = self.resolver.resolveHostName(receiver,
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u"sample.example.com")
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self.assertIs(receiver._resolution, resolution)
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, False)
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self.doThreadWork()
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self.doReactorWork()
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self.assertEqual(receiver._ended, True)
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self.assertEqual(receiver._addresses,
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[IPv6Address('TCP', '::1', 0, flowInfo, scopeID)])
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def test_gaierror(self):
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"""
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Resolving a hostname that results in C{getaddrinfo} raising a
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L{gaierror} will result in the L{IResolutionReceiver} receiving a call
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to C{resolutionComplete} with no C{addressResolved} calls in between;
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no failure is logged.
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"""
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receiver = ResultHolder(self)
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resolution = self.resolver.resolveHostName(receiver,
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u"sample.example.com")
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self.assertIs(receiver._resolution, resolution)
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self.doThreadWork()
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self.doReactorWork()
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, True)
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self.assertEqual(receiver._addresses, [])
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def _resolveOnlyTest(self, addrTypes, expectedAF):
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"""
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Verify that the given set of address types results in the given C{AF_}
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constant being passed to C{getaddrinfo}.
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@param addrTypes: iterable of L{IAddress} implementers
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@param expectedAF: an C{AF_*} constant
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"""
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receiver = ResultHolder(self)
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resolution = self.resolver.resolveHostName(
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receiver, u"sample.example.com", addressTypes=addrTypes
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)
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self.assertIs(receiver._resolution, resolution)
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self.doThreadWork()
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self.doReactorWork()
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host, port, family, socktype, proto, flags = self.getter.calls[0]
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self.assertEqual(family, expectedAF)
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def test_resolveOnlyIPv4(self):
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"""
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When passed an C{addressTypes} parameter containing only
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L{IPv4Address}, L{GAIResolver} will pass C{AF_INET} to C{getaddrinfo}.
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"""
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self._resolveOnlyTest([IPv4Address], AF_INET)
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def test_resolveOnlyIPv6(self):
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"""
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When passed an C{addressTypes} parameter containing only
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L{IPv6Address}, L{GAIResolver} will pass C{AF_INET6} to C{getaddrinfo}.
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"""
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self._resolveOnlyTest([IPv6Address], AF_INET6)
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def test_resolveBoth(self):
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"""
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When passed an C{addressTypes} parameter containing both L{IPv4Address}
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and L{IPv6Address} (or the default of C{None}, which carries the same
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meaning), L{GAIResolver} will pass C{AF_UNSPEC} to C{getaddrinfo}.
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"""
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self._resolveOnlyTest([IPv4Address, IPv6Address], AF_UNSPEC)
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self._resolveOnlyTest(None, AF_UNSPEC)
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def test_transportSemanticsToSocketType(self):
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"""
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When passed a C{transportSemantics} paramter, C{'TCP'} (the value
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present in L{IPv4Address.type} to indicate a stream transport) maps to
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C{SOCK_STREAM} and C{'UDP'} maps to C{SOCK_DGRAM}.
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"""
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receiver = ResultHolder(self)
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self.resolver.resolveHostName(receiver, u"example.com",
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transportSemantics='TCP')
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receiver2 = ResultHolder(self)
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self.resolver.resolveHostName(receiver2, u"example.com",
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transportSemantics='UDP')
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self.doThreadWork()
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self.doReactorWork()
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self.doThreadWork()
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self.doReactorWork()
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host, port, family, socktypeT, proto, flags = self.getter.calls[0]
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host, port, family, socktypeU, proto, flags = self.getter.calls[1]
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self.assertEqual(socktypeT, SOCK_STREAM)
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self.assertEqual(socktypeU, SOCK_DGRAM)
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def test_socketTypeToAddressType(self):
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"""
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When L{GAIResolver} receives a C{SOCK_DGRAM} result from
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C{getaddrinfo}, it returns a C{'TCP'} L{IPv4Address} or L{IPv6Address};
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if it receives C{SOCK_STREAM} then it returns a C{'UDP'} type of same.
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"""
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receiver = ResultHolder(self)
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flowInfo = 1
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scopeID = 2
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for socktype in SOCK_STREAM, SOCK_DGRAM:
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self.getter.addResultForHost(
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"example.com", ("::1", 0, flowInfo, scopeID), family=AF_INET6,
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socktype=socktype
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)
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self.getter.addResultForHost(
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"example.com", ("127.0.0.3", 0), family=AF_INET,
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socktype=socktype
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)
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self.resolver.resolveHostName(receiver, u"example.com")
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self.doThreadWork()
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self.doReactorWork()
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stream4, stream6, dgram4, dgram6 = receiver._addresses
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self.assertEqual(stream4.type, 'TCP')
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self.assertEqual(stream6.type, 'TCP')
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self.assertEqual(dgram4.type, 'UDP')
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self.assertEqual(dgram6.type, 'UDP')
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@implementer(IResolverSimple)
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class SillyResolverSimple(object):
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"""
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Trivial implementation of L{IResolverSimple}
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"""
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def __init__(self):
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"""
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Create a L{SillyResolverSimple} with a queue of requests it is working
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on.
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"""
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self._requests = []
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def getHostByName(self, name, timeout=()):
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"""
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Implement L{IResolverSimple.getHostByName}.
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@param name: see L{IResolverSimple.getHostByName}.
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@param timeout: see L{IResolverSimple.getHostByName}.
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@return: see L{IResolverSimple.getHostByName}.
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"""
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self._requests.append(Deferred())
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return self._requests[-1]
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class LegacyCompatibilityTests(UnitTest, object):
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"""
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Older applications may supply an object to the reactor via
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C{installResolver} that only provides L{IResolverSimple}.
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L{SimpleResolverComplexifier} is a wrapper for an L{IResolverSimple}.
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"""
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def test_success(self):
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"""
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L{SimpleResolverComplexifier} translates C{resolveHostName} into
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L{IResolutionReceiver.addressResolved}.
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"""
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simple = SillyResolverSimple()
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complex = SimpleResolverComplexifier(simple)
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receiver = ResultHolder(self)
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self.assertEqual(receiver._started, False)
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complex.resolveHostName(receiver, u"example.com")
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, False)
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self.assertEqual(receiver._addresses, [])
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simple._requests[0].callback("192.168.1.1")
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self.assertEqual(receiver._addresses,
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[IPv4Address('TCP', '192.168.1.1', 0)])
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self.assertEqual(receiver._ended, True)
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def test_failure(self):
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"""
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L{SimpleResolverComplexifier} translates a known error result from
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L{IResolverSimple.resolveHostName} into an empty result.
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"""
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simple = SillyResolverSimple()
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complex = SimpleResolverComplexifier(simple)
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receiver = ResultHolder(self)
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self.assertEqual(receiver._started, False)
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complex.resolveHostName(receiver, u"example.com")
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, False)
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self.assertEqual(receiver._addresses, [])
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simple._requests[0].errback(DNSLookupError("nope"))
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self.assertEqual(receiver._ended, True)
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self.assertEqual(receiver._addresses, [])
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def test_error(self):
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"""
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L{SimpleResolverComplexifier} translates an unknown error result from
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L{IResolverSimple.resolveHostName} into an empty result and a logged
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error.
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"""
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simple = SillyResolverSimple()
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complex = SimpleResolverComplexifier(simple)
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receiver = ResultHolder(self)
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self.assertEqual(receiver._started, False)
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complex.resolveHostName(receiver, u"example.com")
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self.assertEqual(receiver._started, True)
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self.assertEqual(receiver._ended, False)
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self.assertEqual(receiver._addresses, [])
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simple._requests[0].errback(ZeroDivisionError("zow"))
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self.assertEqual(len(self.flushLoggedErrors(ZeroDivisionError)), 1)
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self.assertEqual(receiver._ended, True)
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self.assertEqual(receiver._addresses, [])
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def test_simplifier(self):
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"""
|
||||
L{ComplexResolverSimplifier} translates an L{IHostnameResolver} into an
|
||||
L{IResolverSimple} for applications that still expect the old
|
||||
interfaces to be in place.
|
||||
"""
|
||||
self.pool, self.doThreadWork = deterministicPool()
|
||||
self.reactor, self.doReactorWork = deterministicReactorThreads()
|
||||
self.getter = FakeAddrInfoGetter()
|
||||
self.resolver = GAIResolver(self.reactor, lambda: self.pool,
|
||||
self.getter.getaddrinfo)
|
||||
simpleResolver = ComplexResolverSimplifier(self.resolver)
|
||||
self.getter.addResultForHost('example.com', ('192.168.3.4', 4321))
|
||||
success = simpleResolver.getHostByName('example.com')
|
||||
failure = simpleResolver.getHostByName('nx.example.com')
|
||||
self.doThreadWork()
|
||||
self.doReactorWork()
|
||||
self.doThreadWork()
|
||||
self.doReactorWork()
|
||||
self.assertEqual(self.failureResultOf(failure).type, DNSLookupError)
|
||||
self.assertEqual(self.successResultOf(success), '192.168.3.4')
|
||||
|
||||
|
||||
def test_portNumber(self):
|
||||
"""
|
||||
L{SimpleResolverComplexifier} preserves the C{port} argument passed to
|
||||
C{resolveHostName} in its returned addresses.
|
||||
"""
|
||||
simple = SillyResolverSimple()
|
||||
complex = SimpleResolverComplexifier(simple)
|
||||
receiver = ResultHolder(self)
|
||||
complex.resolveHostName(receiver, u"example.com", 4321)
|
||||
self.assertEqual(receiver._started, True)
|
||||
self.assertEqual(receiver._ended, False)
|
||||
self.assertEqual(receiver._addresses, [])
|
||||
simple._requests[0].callback("192.168.1.1")
|
||||
self.assertEqual(receiver._addresses,
|
||||
[IPv4Address('TCP', '192.168.1.1', 4321)])
|
||||
self.assertEqual(receiver._ended, True)
|
||||
|
||||
|
||||
|
||||
class JustEnoughReactor(ReactorBase):
|
||||
"""
|
||||
Just enough subclass implementation to be a valid L{ReactorBase} subclass.
|
||||
"""
|
||||
def installWaker(self):
|
||||
"""
|
||||
Do nothing.
|
||||
"""
|
||||
|
||||
|
||||
|
||||
class ReactorInstallationTests(UnitTest, object):
|
||||
"""
|
||||
Tests for installing old and new resolvers onto a
|
||||
L{PluggableResolverMixin} and L{ReactorBase} (from which all of Twisted's
|
||||
reactor implementations derive).
|
||||
"""
|
||||
|
||||
def test_interfaceCompliance(self):
|
||||
"""
|
||||
L{PluggableResolverMixin} (and its subclasses) implement both
|
||||
L{IReactorPluggableNameResolver} and L{IReactorPluggableResolver}.
|
||||
"""
|
||||
reactor = PluggableResolverMixin()
|
||||
verifyObject(IReactorPluggableNameResolver, reactor)
|
||||
verifyObject(IResolverSimple, reactor.resolver)
|
||||
verifyObject(IHostnameResolver, reactor.nameResolver)
|
||||
|
||||
|
||||
def test_installingOldStyleResolver(self):
|
||||
"""
|
||||
L{PluggableResolverMixin} will wrap an L{IResolverSimple} in a
|
||||
complexifier.
|
||||
"""
|
||||
reactor = PluggableResolverMixin()
|
||||
it = SillyResolverSimple()
|
||||
verifyObject(IResolverSimple, reactor.installResolver(it))
|
||||
self.assertIsInstance(reactor.nameResolver, SimpleResolverComplexifier)
|
||||
self.assertIs(reactor.nameResolver._simpleResolver, it)
|
||||
|
||||
|
||||
def test_defaultToGAIResolver(self):
|
||||
"""
|
||||
L{ReactorBase} defaults to using a L{GAIResolver}.
|
||||
"""
|
||||
reactor = JustEnoughReactor()
|
||||
self.assertIsInstance(reactor.nameResolver, GAIResolver)
|
||||
self.assertIs(reactor.nameResolver._getaddrinfo, getaddrinfo)
|
||||
self.assertIsInstance(reactor.resolver, ComplexResolverSimplifier)
|
||||
self.assertIs(reactor.nameResolver._reactor, reactor)
|
||||
self.assertIs(reactor.resolver._nameResolver, reactor.nameResolver)
|
||||
Loading…
Add table
Add a link
Reference in a new issue