[Zope3-Users] XMLRPC Method with **kwargs

[Jeremy Roberts]

Hello zope3 users!

I'm using Zope-3.3.1, and I'm trying to expose a method via xmlrpc and 
I'm having trouble supporting a variable number of kwargs. My use case 
does not know ahead of time how many arguments will be passed to the 
method, hence the use of **kwargs in the method signature.


I get the error:
Unexpected Zope exception: TypeError: renderCode() takes at most 1 
argument (2 given).




The interface/class definitions with the method to be exposed are 
straight-forward:



class IToolCode(IFolder):
Code that is associated with a tool.

code = Text(
title=u'Code',
description=u'The code.',
required=True,
)

def renderCode():
Use customization options posted via XMLRPC and ZPT to 
render 	customized code.




class ToolCode(Folder):
See IToolCode.
implements(IToolCode)

code = FieldProperty(IToolCode['code'])

def renderCode(self, **kwargs):
pt = PageTemplate()
pt.write(self.code)
return pt(customizations=kwargs)





The XMLRPC view uses zope.app.publisher.xmlrpc.MethodPublisher and is 
simple:


class ToolCodeXMLRPC(MethodPublisher):
An XMLRPC view for ToolCode objects.

def renderCode(self, **kwargs):
return self.context.renderCode(kwargs)



The XMLRPC view is configured like so:

xmlrpc:view
for=src.interfaces.IToolCode
methods=renderCode
class=src.browser.views.ToolCodeXMLRPC
permission=src.ViewProtected
/



The XML posted by my JavaScript also seems to be appropriate:
?xml version=1.0?
methodCall
methodNamerenderCode/methodName
params

param
value
struct
membernamecolor/namevaluestringblue/string/value/member
membernamenumber/namevaluestring1/string/value/member
/struct
/value
/param

/params
/methodCall


I'm at a loss for what I am missing. Has anyone successfully exposed a 
method via XMLRPC that used **kwargs?


Thanks for any advice!
-Jer
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Re: [Zope3-Users] XMLRPC Method with **kwargs

[Jeremy Roberts]

Darryl Cousins wrote:

Hi Jeremy,

On Thu, 2007-12-13 at 19:29 -0500, Jeremy Roberts wrote:

class ToolCodeXMLRPC(MethodPublisher):
 An XMLRPC view for ToolCode objects.

 def renderCode(self, **kwargs):
 return self.context.renderCode(kwargs) 


try using:

  def renderCode(self, **kwargs):
  return self.context.renderCode(**kwargs) # !!

Regards,
Darryl



Hey Darryl,

Thanks for the suggestion.
I tried the above edit (instructing python to unpack the kwargs 
dictionary back into keyword arguments with the ** operator) to no avail.


With this edit in place, I still get the same error:
Unexpected Zope exception: TypeError: renderCode() takes at most 1 
argument (2 given)


I'm going to poke around the Zope3 zope.publisher.xmlrpc to see if I can 
gain any insight by finding the code that raises this exception.


If I find anything useful I'll post back to the list...

Thanks!
-Jer


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Re: [Zope3-Users] XMLRPC Method with **kwargs

[Michael Howitz]

Am 14.12.2007 um 01:29 schrieb Jeremy Roberts:

Hello zope3 users!

I'm using Zope-3.3.1, and I'm trying to expose a method via xmlrpc  
and I'm having trouble supporting a variable number of kwargs. My  
use case does not know ahead of time how many arguments will be  
passed to the method, hence the use of **kwargs in the method  
signature.


I get the error:
Unexpected Zope exception: TypeError: renderCode() takes at most 1  
argument (2 given).



Hi!

I think this is because XML-RPC does not support (optional) keyword  
arguments, you only may use positional arguments. A solution for  
optional arguments can be a dictionary containing the optional  
arguments for your XML-RPC-View as the last parameter. But this  
parameter is not optional itself.


So your view could look like:

class ToolCodeXMLRPC(MethodPublisher):
   An XMLRPC view for ToolCode objects.

   def renderCode(self, data):
   return self.context.renderCode(**data)


--
Yours sincerely,
Michael Howitz

gocept gmbh  co. kg · forsterstrasse 29 · 06112 halle/saale
www.gocept.com · fon: +49 345 12298898 · fax: +49 345 12298891

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