[Zope-dev] access to ZCatalog-data via xmlrpc

[Joachim Schmitz]

--On Mittwoch, Mai 29, 2002 16:15:44 +0100 Toby Dickenson=20
<tdickenson@geminidataloggers.com> wrote:

> On Wednesday 29 May 2002 3:24 pm, Joachim Schmitz wrote:
>> Hi,
>>
>> I want to acces a ZCatalog via xmlrpc, but
>>
>> server=3Dxmlrpclib.Server("http://myserver.aixtraware.de"
>>                         =
,BasicAuthTransport(username=3D"user",password=3D"pw
>>                         "))
>> r =3D server.Catalog()
>>
>> results in
>>
>> <Fault -1: "Unexpected Zope exception: cannot marshal <type
>> 'IOBTreeItems'> objects">
>>
>> What is to do, to enable marshalling of those types ?
>
> You could hack xmlrpclib to marshall those object, but I dont recommend
> it.  Those objects can be big (but lazily evaluated), and you would be
> opening a  significant denial of service vulnerability in your server.
But it also can be very interesting for exporting data from a Zope site, to =

be used in other applications.

>
> I suggest you create a method (Python Script?) that makes the catalog
> query,  sanitizes the response by making sure it is not too big, and
> returns a  vanilla list or dictionary
I wrote a little pythonscript to export data from a ZPatterns Rack, where=20
the data is stored in a propertysheet:

res=3Dcontext.Catalog()

t=3D[]
for m in  sequence.sort(res,(('reg_id','cmp','desc'),)):
    r=3Dm.propertysheets.Basic.propertyItems()
    t.append(r)
return t

This runs fine, when I test the script. But when I access it with xmlrpc, I =

get:

<Fault -1: "Unexpected Zope exception: cannot marshal <type 'None'>=20
objects">

I changed Zope xmlrpclib.py and added to the Marshaller class:

    def dump_None(self, value):
        self.write("<value><string>None</string></value>\n")
    dispatch[NoneType] =3D dump_None

Now that works, but I think the xmlrpclib.py, should be able to marshall=20
the "None" type.





Mit freundlichen Gr=FC=DFen                              Joachim Schmitz
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