[Python-Dev] Incompatible changes to xmlrpclib

[M.-A. Lemburg]

Fredrik Lundh wrote:
> mal wrote:
> 
> 
>>>Any news on this one ?
>>
>>If noone objects, I'd like to restore the old interface.
> 
> the dump methods are an internal implementation details, and are
> only accessed through an internal dispatcher table.  even if you
> override them, the marshaller won't use your new methods.

If I subclass the Marshaller and Unmarshaller and
then use the subclasses, it would :-)

> so what exactly is your use case?

I needed to adapt the type mapping in xmlrpclib a
bit to better fit our needs. This is done by
adding a few more methods to the Marshaller
and Unmarshaller (it's a hack, but the module doesn't
allow any other method, AFAIK):

def install_xmlrpclib_addons(xmlrpclib):
     m = xmlrpclib.Marshaller
     m.dump_datetime = _dump_datetime
     m.dispatch[DateTime.DateTimeType] = m.dump_datetime
     m.dump_buffer = _dump_buffer
     m.dispatch[types.BufferType] = m.dump_buffer
     m.dump_int = _dump_int
     m.dispatch[types.IntType] = m.dump_int
     u = xmlrpclib.Unmarshaller
     u.end_dateTime = _load_datetime
     u.dispatch['dateTime.iso8601'] = u.end_dateTime
     u.end_base64 = _load_buffer
     u.dispatch['base64'] = u.end_base64
     u.end_boolean = _load_boolean
     u.dispatch['boolean'] = u.end_boolean

> (and whatever you did to make that use case work, how do I stop
> you from doing the same thing with some other internal part of the
> standard library? ;-)

It would be nice to open up the module a little
more so that hacks like the one above are not necessary,
e.g. by making the used classes parameters to the
loads/dumps functions.

Then you'd run into the same problem, though, since now
subclasses would need to access the dump/load methods.

PS: Standard support for None would be nice to have
in xmlrpclib... at least for the Marshalling side, since
this is a very common problem with xmlrpc.

-- 
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
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