• cattrs version: 22.2.0
• Python version: 3.9.12
• Operating System: Ubuntu

Description

First of all, thanks for the awesome library!

My use-case is that I want to be able to serialize as much as I can by falling back to something like pickle for non-attrs classes. I understand that pickle can't serialize everything, but I'm just trying to cover as many classes as I can. Unstructuring is not a problem by using things like jsonpickle or the default option of orjson, but structuring is giving me a lot of problems. I've tried to use cattrs.register_structure_hook_func, but I haven't found a way to make it work. I guess one solution would be to find a way to check if a type is supported (either implicitly or explicitly) by the current converter or not, but I haven't found a good way to do so.

What I Did

# infinite recursion b/c of attrs class that have not been explicitly registered.
def fallback(d, t):
    if attrs.has(t):
        return cattrs.structure(d, t)
    return pickles.loads(d)
cattrs.register_structure_hook_func(lambda cls: True, lambda d, t: t.deserialize(d))

# fails on collections of attrs classes such as list[attrs]
def fallback(d, t):
    if attrs.has(t):
        return cattrs.structure_attrs_fromdict(d)
    return pickles.loads(d)
cattrs.register_structure_hook_func(lambda cls: True, lambda d, t: t.deserialize(d))

Any help would be greatly appreciated!