Nested Structs how to.

Sorry if I missed this in the docs (or tests which I tried to go through as well) but is it possible to create and decode a Struct with child structs that can be recursively decoded?

It seems the encoding works just fine but decoding will only work by decoding to a dict (the default):

[ins] In [2]: import msgspec

[nav] In [3]: class c(msgspec.Struct):
         ...:     s: msgspec.Struct

[nav] In [4]: class b(msgspec.Struct):
         ...:     val: int

[ins] In [5]: msgspec.encode(c(b(10)))
Out[5]: b'\x81\xa1s\x81\xa3val\n'

[ins] In [6]: msg = msgspec.encode(c(b(10)))

[ins] In [7]: msgspec.decode(msg)
Out[7]: {'s': {'val': 10}}

[ins] In [8]: msgspec.decode(msg, type=c)
Out[8]: c(s=Struct())

[ins] In [10]: msgspec.decode(msg, type=msgspec.Struct)
Out[10]: Struct()

If there is no plan to support nested structs natively, might there be a recommended recipe for this kind of thing?

For my purposes it would be lovely to have an IPC message format where payloads in certain types of messages could also be structs (who’s schema could potentially be introspected from responding function annotations).

Cheers and thanks for the super sweet lib!

[goodboy]

Would you want to submit a PR?

Yah more then happy to since I already have a real-world use case: IPC messages which can describe their “value” as a Struct.

[jcrist]

Also just as a follow up, what would be super ideal looking forward to python 3.10’s new structural pattern matching is supporting stuff like

From reading the pep I believe pattern matching will work out-of-the-box for keyword arguments in structs, but not positional arguments (a small patch would fix this, I’ll open an issue). And serializing enums already works fine.