处理twisted中的ConnectionLost异常

Question

我无法处理连接丢失的异常。首先，我设置了与jabber服务器的连接并进行ping测试。我使用的是wokkel库。然后，我在发送ping的函数中添加了错误回调（errback）。在这个错误回调中，我处理连接丢失的错误。之后，我关闭了互联网连接。但我看不到这个连接丢失的错误是否被处理。我在我的应用程序中关闭了连接，所有的异常处理程序都被调用了。

ping测试是成功的。

[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'>/>»

连接丢失的处理程序没有被调用。“在HivemindXMPPClient中流已关闭”在StreamManager的_disconnected方法中被打印出来。

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

所有异常在关闭流之后都被处理了。

[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>>

有没有人能解释一下为什么在关闭流之后错误回调会被调用？实际上，我想实现一个重新连接的功能（我已经在使用ReconnectingFactory，但它对连接丢失没有反应）。有没有人能给我一些在twisted中实现重新连接的例子？

脚本示例。运行这个脚本（确保ping测试正常）。然后关闭你的互联网连接。当发生几次ping后，你需要终止这个脚本。正如你所看到的，连接丢失的错误在关闭连接后被处理。

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()

error handling twisted jabber wokkel ping test connectionlost reconnecting stream management

处理twisted中的ConnectionLost异常

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