我正在运行 twisted.words MSN 协议示例，来自位于此处的 Twisted 文档：http://twistedmatrix.com/projects/words/documentation/examples/msn_example.py
但是，当我运行此示例脚本时，出现未处理错误异常：
2012-05-12 15:39:51-0300 [-] Log opened.
2012-05-12 15:39:51-0300 [-] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x8c6c18c>
2012-05-12 15:39:52-0300 [Dispatch,client] Starting factory <twisted.words.protocols.msn.NotificationFactory instance at 0x8c6c2cc>
2012-05-12 15:39:52-0300 [Dispatch,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8c6c18c>
2012-05-12 15:39:53-0300 [Notification,client] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x8c710ec>
2012-05-12 15:39:53-0300 [Notification,client] Unhandled Error
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 84, in callWithLogger
return callWithContext({"system": lp}, func, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 69, in callWithContext
return context.call({ILogContext: newCtx}, func, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81, in callWithContext
return func(*args,**kw)
--- <exception caught here> ---
File "/usr/lib/python2.7/dist-packages/twisted/internet/selectreactor.py", line 146, in _doReadOrWrite
why = getattr(selectable, method)()
File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 460, in doRead
rval = self.protocol.dataReceived(data)
File "/usr/lib/python2.7/dist-packages/twisted/protocols/basic.py", line 564, in dataReceived
why = self.lineReceived(line)
File "/usr/lib/python2.7/dist-packages/twisted/words/protocols/msn.py", line 670, in lineReceived
handler(params.split())
File "/usr/lib/python2.7/dist-packages/twisted/words/protocols/msn.py", line 848, in handle_USR
authData=params[3])
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 108, in execute
return succeed(result)
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 71, in succeed
d.callback(result)
File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 360, in callback
assert not isinstance(result, Deferred)
exceptions.AssertionError:
2012-05-12 15:39:53-0300 [Notification,client] Stopping factory <twisted.words.protocols.msn.NotificationFactory instance at 0x8c6c2cc>
2012-05-12 15:39:55-0300 [PassportNexus,client] Starting factory <twisted.internet.protocol.ClientFactory instance at 0x8d014cc>
2012-05-12 15:39:55-0300 [PassportNexus,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8c710ec>
2012-05-12 15:39:56-0300 [PassportLogin,client] Stopping factory <twisted.internet.protocol.ClientFactory instance at 0x8d014cc>
- 蟒蛇 2.7.2+
- 扭曲 11.0.0
- pyOpenSSL 0.12
我以前从未使用过 t.w.protocols.msn 协议，但在我看来，Twisted 的 846 行msn.py中存在错误。这是有问题的函数：
def handle_USR(self, params):
if len(params) != 4 and len(params) != 6:
raise MSNProtocolError, "Invalid Number of Parameters for USR"
mechanism = params[1]
if mechanism == "OK":
self.loggedIn(params[2], unquote(params[3]), int(params[4]))
elif params[2].upper() == "S":
# we need to obtain auth from a passport server
f = self.factory
d = execute( # <------- here
_login, f.userHandle, f.password, f.passportServer,
authData=params[3])
d.addCallback(self._passportLogin)
d.addErrback(self._passportError)
defer.execute 是使用 msn._login 及其参数调用的，但msn._login应该返回延迟。将 defer.execute 与可能返回延迟的函数一起使用是不合适的，因为它将立即通过 defer.succeed 包装在另一个延迟中，并且延迟不能保存其他延迟作为结果。
那里的execute调用应改用defer.maybeDeferred。我希望如果您将maybeDeferred添加到文件顶部的twisted.internet.defer导入中并将此execute调用更改为maybeDeferred调用，它将开始工作（或至少由于不同的错误:)而开始失败）。