[Twisted-Python] foolscap copyable and constraint

[Marco Giusti]

ciao! i'm playing a bit with foolscap and i try to use RemoteInterface
to describe my constraint but i cannot understand how to use it with
pass-by-copy. this is a small example:


    from foolscap import RemoteInterface, registerCopier, \
            registerRemoteCopyFactory

    class Label:
        def __init__(self, text):
            self.text = text


    def copyLabel(label):
        return ('_Label', {'text': label.text})

    registerCopier(Label, copyLabel)

    def makeLabel(state):
        label = Label(state['text'])
        return label

    registerRemoteCopyFactory('_Label', makeLabel)


    class RITest(RemoteInterface):
        def getLabel():
            return Label


but what i get is:
foolscap.tokens.UnknownSchemaType: can't make constraint from
'__main__.Label' (<type 'classobj'>)

which is the correct way to define a constraint for a third party-class?
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