help de-serialize XML-RPC string

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Views: 771 | Replies: 2

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Join Date: Aug 2007

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help de-serialize XML-RPC string

Sep 6th, 2007

I cannot figure out the correct way to de-serialize a string passed via xml-rpc. If I print out the string I get

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{'params': ['123', 3], 'methodName': 'function'}

I could split the string, and then drop unwanted characters. But, that seems like the wrong way.

Any help would be appreciated.

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Join Date: Jul 2006

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Re: help de-serialize XML-RPC string

Sep 11th, 2007

I'm mostly ignorant of these matters, but it looks to me like your string is just a dictionary. So:

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>>> s = "{'params': ['123', 3], 'methodName': 'function'}"
 
>>> result = eval(s)
>>> result
{'methodName': 'function', 'params': "('123', 3)"}
>>> print result['params']
['123', 3]
>>> print result['methodName']
function
>>> s = "{'params': ['123', 3], 'methodName': 'function'}"

>>> result = eval(s)
>>> result
{'methodName': 'function', 'params': "('123', 3)"}
>>> print result['params']
['123', 3]
>>> print result['methodName']
function

So now you've deserialized it to a dictionary containing the function call and the parameters. To make the call, you could then do:

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def function(a,b):
    print a,b  # setup for testing only
 
>>> result["params"] = '(' + str(result["params"])[1:-1] + ')'
>>> result["params"] # just to see
"('123', 3)"
>>> result["methodName"] + result["params"]
"function('123', 3)"
>>> return_val = eval(result["methodName"]+result["params"])
123 3
def function(a,b):
    print a,b  # setup for testing only

>>> result["params"] = '(' + str(result["params"])[1:-1] + ')'
>>> result["params"] # just to see
"('123', 3)"
>>> result["methodName"] + result["params"]
"function('123', 3)"
>>> return_val = eval(result["methodName"]+result["params"])
123 3

So we turn the function call into a string and then evaluate it.

HOWEVER, comma,

I am 99.9% certain that the xmlrpclib already has some function to execute the return string for you, probably with appropriate safety measures to keep malicious remote function calls from occurring. Poke around the xmlrpclib file and see.

Jeff

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Re: help de-serialize XML-RPC string

Sep 12th, 2007

Thank you for the help. It will come in handy.

I was luckily enough to be the one working on both the xmlrpc call and the parsing. I was able to found a short cut around it though.

I was using c++ and the XmlRpc++ library. I assigned each variable each own parameter ( param1, param2, param3, etc. It ended up sending a string that looked just like a data list type.

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{'param1': '123', 'param2': '3' , 'methodName': 'function'}

I thought was cool, because all I had to do was declare a new data list and call out the variables.

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 python Syntax (Toggle Plain Text) 
def subtractCredit(self, arg):
  d2 = arg[0]
  print "Recieved Arg:", arg[0]
  print "methodName:", d2['methodName']
  print "pin:", d2['param1']
  print "amount:", d2['param2']
def subtractCredit(self, arg):
  d2 = arg[0]
  print "Recieved Arg:", arg[0]
  print "methodName:", d2['methodName']
  print "pin:", d2['param1']
  print "amount:", d2['param2']