我是Twisted的新手,所以我确信这是一个新手的错误。我已经构建了一个简单的服务器,它接收来自客户端的消息,并在收到消息时触发将消息打印到控制台的回调。工厂实例没有创建新的推迟
在第一个实例中,服务器按预期工作。不幸的是,当我启动第二个客户端时,出现跟随错误“twisted.internet.defer.AlreadyCalledError”。我的理解是,工厂会制造一个延期的新实例,即新的延期将不会被调用过吗?
请参阅下面的代码。任何帮助将非常感激。
import sys
from twisted.internet.protocol import ServerFactory, Protocol
from twisted.internet import defer
class LockProtocol(Protocol):
lockData = ''
def dataReceived(self, data):
self.lockData += data
if self.lockData.endswith('??'):
self.lockDataReceived(self.lockData)
def lockDataReceived(self, lockData):
self.factory.lockDataFinished(lockData)
class LockServerFactory(ServerFactory):
protocol = LockProtocol
def __init__(self):
self.deferred = defer.Deferred() # Initialise deferred
def lockDataFinished(self, lockData):
self.deferred.callback(lockData)
def clientConnectionFailed(self, connector, reason):
self.deferred.errback(reason)
def main():
HOST = '127.0.0.1' # localhost
PORT = 10001
def got_lockData(lockData):
print "We have received lockData. It is as follows:", lockData
def lockData_failed(err):
print >> sys.stderr, 'The lockData download failed.'
errors.append(err)
factory = LockServerFactory()
from twisted.internet import reactor
# Listen for TCP connections on a port, and use our factory to make a protocol instance for each new connection
port = reactor.listenTCP(PORT,factory)
print 'Serving on %s' % port.getHost()
# Set up callbacks
factory.deferred.addCallbacks(got_lockData,lockData_failed)
reactor.run() # Start the reactor
if __name__ == '__main__':
main()