[Twisted-Python] exceptions.AttributeError: 'NoneType' object has no attribute 'write'

[Stefano Canepa]

Hi all,
	I have this error running the simple module I wrote after the error.

$ ./TCAdrvC.py
sending to TCA: MSH|^~\&|XLIS|CLILAB|CLC^1|TCA|20010101080811||OML^O21|
200101010OBR|1|123456^XLIS||0001^Aliquot^XLIS||||||||DC1|||SER|3||
pippo:

MSH|^~\&|XLIS|CLILAB|CLC^1|TCA|20010101080811||OML^O21|20010101080811|
P|2.4|||NOBR|1|123456^XLIS||0001^Aliquot^XLIS||||||||DC1|||SER|3||
None
Peer will receive following PB traceback:
Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/twisted/spread/banana.py", line
114, in gotItem
    self.callExpressionReceived(item)
  File "/usr/lib/python2.3/site-packages/twisted/spread/banana.py", line
81, in callExpressionReceived
    self.expressionReceived(obj)
  File "/usr/lib/python2.3/site-packages/twisted/spread/pb.py", line
561, in expressionReceived
    method(*sexp[1:])
  File "/usr/lib/python2.3/site-packages/twisted/spread/pb.py", line
872, in proto_message
    self._recvMessage(self.localObjectForID, requestID, objectID,
message, answerRequired, netArgs, netKw)
--- <exception caught here> ---
  File "/usr/lib/python2.3/site-packages/twisted/spread/pb.py", line
886, in _recvMessage
    netResult = object.remoteMessageReceived(self, message, netArgs,
netKw)
  File "/usr/lib/python2.3/site-packages/twisted/spread/flavors.py",
line 113, in remoteMessageReceived
    state = method(*args, **kw)
  File "./TCAdrvC.py", line 102, in remote_sendToTCA
    d.addCallback(self.sendMsg(msg,RETRIES))
  File "/home/sc/Sviluppo/CCIC/HL7/HL7LLPSpecialClient.py", line 122, in
sendMsg    self.sendLine(msgToSend)
  File "/usr/lib/python2.3/site-packages/twisted/protocols/basic.py",
line 269, in sendLine
    return self.transport.write(line + self.delimiter)
exceptions.AttributeError: 'NoneType' object has no attribute 'write'

class Receiver(pb.Root, HL7LLPClientProtocol):

    def __init__(self):
         HL7LLPClientProtocol.__init__(self)
        
    def remote_sendToTCA(self, msg):

        self.delimiter = "\x02"
        
        ## if DEBUG:
        print 'sending to TCA:', msg
        # Create creator and connect
        clientCreator = protocol.ClientCreator(reactor,  
                        HL7LLPClientProtocol)
        d = clientCreator.connectTCP(SERVER, PORT)
        d.addCallback(self.sendMsg(msg,RETRIES))
        return msg

def main():
    reactor.listenTCP(LISTENPORT, pb.PBServerFactory(Receiver()))
    reactor.run()

---------

the module HL7LLPClientProtocol is:

class HL7LLPClientProtocol(LineReceiver):
    delimiter = "\x02"

    def sendMsg(self, msg, numRetries=RETRIES):
        self.msg = msg
        msgToSend = "\x01"+msg +"\x0d"
        self.sendLine(msgToSend)
        return self.timeoutAndRetry(numRetries)
...

Which is my mistake?

Bye
Stefano

-- 
Stefano Canepa aka sc: sc at linux.it  http://www.stefanocanepa.it
Three great virtues of a programmer: laziness, impatience and hubris.
Le tre grandi virtù di un programmatore: pigrizia, impazienza e
arroganza. (Larry Wall)
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