sending object (recursive data structures) by XML-RPC in python

Question

I need to send an object through XML-RPC in python. My object consist of composite data type to populate a tree structure:

class Node(object):
'''Composite data type '''
def __init__(self, pData, pParent=None):
    self.mData = pData
    self.mParent = pParent
    self.mChildren = []

self.mParent is reference to its parent node. So I have a recursive data structures to create this structure. When I try to send this data type directly by XML-RPC, it gives this error:

xmlrpclib.Fault: <Fault 1: "<type 'exceptions.TypeError'>:cannot marshal recursive dictionaries">

I think this exception raised due to its complex structure. Because xml-rpc supports only basic data types. I couldn't use dictionaries, because I need to have the references in my client peer. When i use dictionaries with references, it gives the same error above. I couldn't use pickle, It needs to be language independent.

Do you have any suggestion to send an object through XML-RPC natively? Maybe how to create my own data type to send it in xml format?

user2665694 · Accepted Answer · 2011-05-20 15:26:49Z

1

Look at

http://www.xs4all.nl/~irmen/pyro3/

when you want to transfer Python objects over the wire.

Since XMLRPC is based on XML -as the name implies - you can not transfer Python objects over the wire without serialization.

answered May 20, 2011 at 15:26

user2665694

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1 Comment

zekifh Over a year ago

thanks for reply. As you said, it needs to be serialized in suitable XML representations before sending object. For example, when I send a string variable, XML-RPC generates automatically <string>variable</string>. So is it also possible that I serialize my object in xml-format (without pickle, changing the code in xmlrpclib) and send it to another peer?

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