为什么我在尝试实现调用 AMP 命令的 LoopingCall 函数时会出错?
from twisted.protocols.amp import AMP
from twisted.python.log import startLogging, err
from twisted.internet.task import LoopingCall
from twisted.internet import reactor
from sys import stdout
import commands
startLogging(stdout)
class MyAMP:
def __init__(self, host, port):
destination = TCP4ClientEndpoint(reactor, host, port)
self.protocol = AMP()
self.d = connectProtocol(destination, self.protocol)
def say(self):
return self.protocol.callRemote(commands.Say,
phrase='Hello world')
def loop(myamp):
myamp.say()
def main(host, port):
myamp = MyAMP(host, port)
lc = LoopingCall(loop, myamp=myamp)
lc.start(4.0)
reactor.run()
main('127.0.0.1', 12345)
myamp.say()
在循环内调用时出错:
2013-08-16 12:28:58-0400 [-] Starting factory <twisted.internet.endpoints.OneShotFactory instance at 0x92273ec>
2013-08-16 12:28:58-0400 [-] Unhandled error in Deferred:
2013-08-16 12:28:58-0400 [-] Unhandled Error
Traceback (most recent call last):
File "lib/client.py", line 35, in <module>
main('127.0.0.1', 12345)
File "lib/client.py", line 32, in main
lc.start(4.0)
File "/usr/local/lib/python2.7/site-packages/twisted/internet/task.py", line 173, in start
self()
File "/usr/local/lib/python2.7/site-packages/twisted/internet/task.py", line 218, in __call__
d = defer.maybeDeferred(self.f, *self.a, **self.kw)
--- <exception caught here> ---
File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 137, in maybeDeferred
result = f(*args, **kw)
File "lib/client.py", line 26, in loop
myamp.say()
File "lib/client.py", line 22, in say
phrase='Hello world')
File "/usr/local/lib/python2.7/site-packages/twisted/protocols/amp.py", line 821, in callRemote
return co._doCommand(self)
File "/usr/local/lib/python2.7/site-packages/twisted/protocols/amp.py", line 1778, in _doCommand
self.requiresAnswer)
File "/usr/local/lib/python2.7/site-packages/twisted/protocols/amp.py", line 752, in _sendBoxCommand
box._sendTo(self.boxSender)
File "/usr/local/lib/python2.7/site-packages/twisted/protocols/amp.py", line 577, in _sendTo
proto.sendBox(self)
exceptions.AttributeError: 'NoneType' object has no attribute 'sendBox'
2013-08-16 12:28:58-0400 [Uninitialized] AMP connection established (HOST:IPv4Address(TCP, '127.0.0.1', 50457) PEER:IPv4Address(TCP, '127.0.0.1', 12345))