--On Mittwoch, Mai 29, 2002 16:15:44 +0100 Toby Dickenson 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=xmlrpclib.Server("http://myserver.aixtraware.de" ,BasicAuthTransport(username="user",password="pw ")) r = 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 the data is stored in a propertysheet:

res=context.Catalog()

t=[] for m in sequence.sort(res,(('reg_id','cmp','desc'),)): r=m.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'> 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] = dump_None

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

Mit freundlichen Grüßen Joachim Schmitz -------------------------------------------------------------------- AixtraWare Ingenieurbüro für Internetanwendungen Hüsgenstr. 33a, D-52457 Aldenhoven Telefon: +49-2464-8851, FAX: +49-2464-905163 -------------------------------------------------------------------- Key fingerprint = DA10 CC82 62F8 1DBB 39A1 1EDC 725B 3317 A8D7 C3A6 Keyserver: http://www.keyserver.net/en/

Joachim Schmitz wrote:

--On Mittwoch, Mai 29, 2002 16:15:44 +0100 Toby Dickenson 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=xmlrpclib.Server("http://myserver.aixtraware.de" ,BasicAuthTransport(username="user",password="pw ")) r = server.Catalog()

results in

<Fault -1: "Unexpected Zope exception: cannot marshal <type 'IOBTreeItems'> objects">

What is to do, to enable marshalling of those types ?

XML-RPC only has a limited set of types it can marshal and that can't be changed without breaking the standard.

The alternative would be sending Python pickles encoded as XML-RPC binary over the wire.

...

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 the data is stored in a propertysheet:

res=context.Catalog()

t=[] for m in sequence.sort(res,(('reg_id','cmp','desc'),)): r=m.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'> 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] = dump_None

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

None doesn't have an equivalent type in XML-RPC.

On Thursday 30 May 2002 11:29 am, Toby Dickenson wrote:

Yes, that means you unmarshall some xml-rpc data into a python None.

Argh.

That means you *cant* unmarshall some xml-rpc data into a python None.