python – 处理扭曲的ConnectionLost异常

2019年8月3日 409次阅读

我无法处理ConnectionLost异常.

我所拥有的简要例子.首先,我设置了与jabber服务器的连接并ping它.我使用wokkel库.然后我将errback添加到发送ping的方法.在errback中我处理ConnectionLost错误.之后,我关闭了互联网连接.但我无法看到是否处理了ConnectionLost.我在我的应用程序中关闭连接,并调用所有异常处理程序.

Ping很顺利.

[XmlStream,client] Ping to JID(u'jabber.ru') started at HivemindPingClientProtocol 
[-] SEND: «iq to='jabber.ru' type='get' id='H_3'>/>»
[XmlStream,client] RECV: "/><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>"

互联网连接已关闭

[-] SEND: «iq to='jabber.ru' type='get' id='H_6'>/>»
[-] SEND: «iq to='jabber.ru' type='get' id='H_7'>/>»

不调用ConnectionLost的处理程序. “在HivemindXMPPClient处关闭流”将在StreamManager中以_disconnected方法打印

[-] Protocol stopped
[-] Protocol closed
[-] Transport stopped
[XmlStream,client] Stream closed at HivemindXMPPClient

关闭流后处理所有异常.

[XmlStream,client] Failure [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion.
[XmlStream,client] Failure [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionLost'>: Connection to the other side was lost in a non-clean fashion.] 
[XmlStream,client] Connection lost with [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionDone'>: Connection was closed cleanly.] 
[XmlStream,client] Stopping factory <hivemind.network.network_core.HivemindXmlStreamFactory object at 0xa2e904c>>

任何人都可以解释为什么在关闭流后调用errbacks？实际上我想实现一个重新连接功能(我已经使用了ReconnectingFactory,但它没有对ConnectionLost做出反应).有人可以给我一些扭曲重新连接实现的例子吗？

脚本示例.
运行此脚本(确保ping工作正常).然后关闭您的互联网连接.发生多次ping时,需要终止脚本.如您所见,在关闭连接后处理ConnectionLost错误.

import sys
from twisted.python import log
from twisted.words.protocols import jabber
from twisted.internet.error import ConnectionLost
from wokkel.client import XMPPClient
from wokkel.ping import PingClientProtocol
from twisted.internet.task import LoopingCall

JID = unicode('YOUR@JABBER.ID')
PASSWORD = 'PASSWORD'
INTERVAL = 3

class SpecialPingClientProtocol(PingClientProtocol):

    def __init__(self, entity, interval):
        self.__entity = jabber.jid.internJID(entity)
        self.__interval = interval
        self.__pingLoop = None

    def _onError(self, failure):
        log.msg('Failure %s at %s' % (failure, self.__class__.__name__))
        error = failure.trap(jabber.error.StanzaError, ConnectionLost)
        if error == jabber.error.StanzaError:
            if failure.value.condition == 'feature-not-implemented':
                return None
        elif error == ConnectionLost:
            # Do some beautiful things
            log.msg('Connection is lost. I want to reconnect NOW')
        return failure

    def _sendPing(self):
        defer = self.ping(self.__entity)
        defer.addErrback(self._onError)

    def stopPing(self):
        log.msg('Ping to %s stopped at %s' % (self.__entity, self.__class__.__name__))
        if self.__pingLoop is not None and self.__pingLoop.running:
            self.__pingLoop.stop()
            self.__pingLoop = None

    def startPing(self):
        log.msg('Ping to %s started at %s ' % (self.__entity, self.__class__.__name__))
        self.__pingLoop = LoopingCall(self._sendPing)
        self.__pingLoop.start(self.__interval, now = False)

def main():
    log.startLogging(sys.stdout)
    transport = XMPPClient(jabber.jid.internJID(JID), PASSWORD)
    transport.logTraffic = True
    pinger = SpecialPingClientProtocol(JID, INTERVAL)
    pinger.setHandlerParent(transport)
    transport.startService()
    pinger.startPing()
    reactor.run()

if __name__ == '__main__':
    from twisted.internet import reactor
    main()

最佳答案 议定书有：

clientConnectionFailed(self, connector, reason)
clientConnectionLost(self, connector, reason)

你可以覆盖两个并调用
PingClientProtocol.clientConnectionFailed
和PingClientProtocol.clientConnectionLost

假设PingClientProtocol以某种方式从Protocol继承

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