我正在尝试构建客户端向服务器发送消息的客户端/服务器系统。服务器只是打印出客户端发送的内容。
from twisted.internet import protocol, reactor
class Echo(protocol.Protocol):
def dataReceived(self, data):
print data
self.transport.write(data)
class EchoFactory(protocol.Factory):
def buildProtocol(self, addr):
return Echo()
reactor.listenTCP(8000, EchoFactory())
reactor.run()
问题在于,当我尝试使用此代码从客户端发送多条消息时,客户端在第一次连接后发出错误并发送。
from twisted.internet import reactor, protocol
import time
class EchoClient(protocol.Protocol):
def __init__(self, message):
self.message = message
def connectionMade(self):
self.transport.write(self.message)
def dataReceived(self, data):
print "Server said:", data
self.transport.loseConnection()
class EchoFactory(protocol.ClientFactory):
def __init__(self, message):
self.message = message
def buildProtocol(self, addr):
return EchoClient(self.message)
def clientConnectionFailed(self, connector, reason):
print "Connection failed."
reactor.stop()
def clientConnectionLost(self, connector, reason):
print "Connection lost."
reactor.stop()
def sendMessage(message):
reactor.connectTCP("localhost", 8000, EchoFactory(message))
reactor.run()
if __name__ == "__main__":
while True:
r = raw_input(">")
if r == 'q' or len(r) == 0: break
sendMessage(r)
可能有什么问题?这是错误消息。
>a
Server said: a
Connection lost.
>b
Traceback (most recent call last):
File "echoclient.py", line 38, in <module>
sendMessage(r)
File "echoclient.py", line 32, in sendMessage
reactor.run()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py", line 1168, in run
self.startRunning(installSignalHandlers=installSignalHandlers)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py", line 1148, in startRunning
ReactorBase.startRunning(self)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/twisted/internet/base.py", line 680, in startRunning
raise error.ReactorNotRestartable()
twisted.internet.error.ReactorNotRestartable
答案 0 :(得分:1)
虽然这个问题已经过时并且有两个不相关的答案,但我想为那些渴望了解的人回答这个问题。问题是,在dataReceived方法的服务器代码中,您有self.transport.write(data)
(它将收到的每条消息都发送给客户端),同时在客户端代码中,再次在dataReceived方法中,您拥有命令self.transport.loseConnection()
(一旦消息进入,它就会失去与服务器的连接)。所以,如果你删除任何这些行,你应该没事。在当前设置中,从客户端发送的第一条消息将被发送回客户端,这将导致连接断开。
此外,您在每次尝试发送邮件时都在调用reactor.run()。 Reactor.run应该只在主函数中调用一次。
答案 1 :(得分:0)
反应堆无法重启。
答案 2 :(得分:-1)
出于我自己的目的,使用套接字向服务器发送消息可以正常工作。
import socket
client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('localhost', 8000))
while True:
a = raw_input("> ")
if a == 'q' or len(a) == 0:
client_socket.close()
break
else:
client_socket.send(a)