Re: [Twisted-Python] Multicast XMLRPC

Jean-Paul Calderone wrote:

On Thu, 24 Aug 2006 11:49:49 -0400, "Chaz." wrote:

...

I have a XMLPRC client that works well under TCP and I am now trying to get it to work under Multicast conditions.

Here is the "TCP" code I used:

class StorageService(internet.TCPServer): def __init__(self,tcpPort,configInfo): r = StoragePeer(configInfo) xmlrpc.addIntrospection(r) internet.TCPServer.__init__(self,tcpPort,server.Site(r))

I changed the call to TCPServer to:

class StorageService(internet.TCPServer): def __init__(self,tcpPort,configInfo): r = StoragePeer(configInfo) xmlrpc.addIntrospection(r) internet.MulticastServer.__init__(self,tcpPort,server.Site(r))

I thought this would work since, but it doesn't. What I get returned is the following error message:

Failed to load application: unbound method __init__() must be called with MulticastServer instance as first argument (got StorageService instance instead)

Does anyone know what I am doing wrong?

The immediate mistake you are making is trying to call an unbound method from one class with a self argument which is an instance of an unrelated class. This is not allowed in Python.

The overall mistake you are making is trying to use XML-RPC over multicast. This does not work. Perhaps something like XML-RPC could be made to run over multicast, but it would be a much larger undertaking than just using MulticastServer in place of TCPServer.

Jean-Paul

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What I found when I did the following call: internet.TCPServer(tcpport,server.Site(r)) that the call failed. Here is the trace output...perhaps someone can tell me what is wrong... Aug 24 12:22:26 sideshow whirlwind: [-] Traceback (most recent call last): Aug 24 12:22:26 sideshow whirlwind: [-] File "TwistedPeer.py", line 146, in ? Aug 24 12:22:26 sideshow whirlwind: [-] td.runApp(tdoptions) Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/scripts/twistd.py", line 196, in runApp Aug 24 12:22:26 sideshow whirlwind: [-] startApplication(config, application) Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/scripts/twistd.py", line 173, in startApplication Aug 24 12:22:26 sideshow whirlwind: [-] service.IService(application).privilegedStartService() Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/application/service.py", line 191, in privilegedStartService Aug 24 12:22:26 sideshow whirlwind: [-] service.privilegedStartService() Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/application/service.py", line 191, in privilegedStartService Aug 24 12:22:26 sideshow whirlwind: [-] service.privilegedStartService() Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/application/internet.py", line 68, in privilegedStartService Aug 24 12:22:26 sideshow whirlwind: [-] self._port = self._getPort() Aug 24 12:22:26 sideshow whirlwind: [-] File "/usr/lib64/python2.4/site-packages/twisted/application/internet.py", line 86, in _getPort Aug 24 12:22:26 sideshow whirlwind: [-] return getattr(reactor, 'listen'+self.method)(*self.args, **self.kwargs) Aug 24 12:22:26 sideshow whirlwind: [-] AttributeError: StorageService instance has no attribute 'args' When I used the code I did, everything worked... Chaz.