为什么在尝试实现调用AMP命令的LoopingCall函数时出现错误?
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)
在循环内调用
myamp.say()
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))
最佳答案
您尝试在建立连接之前先callRemote
。默认情况下,LoopingCall
将在启动时立即运行其功能。代替执行lc.start(4.0)
,而是执行lc.start(4.0, now=False)
。这将在第一次呼叫之前等待四秒钟。
关于python - LoopingCall AMP命令,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/18264661/