Dan Gohman (Aug 17 2023 at 19:22): Dan Gohman (Aug 17 2023 at 19:22):Are there any conventions yet for formatting component-model-typed values to text? Like, a common way of rendering variant/result/flags/etc. to JSON, or some other format?
Lann Martin (Aug 17 2023 at 20:20):I've been working on this JSON repr: https://hackmd.io/@lann/rJFNJ2Mhn
Lann Martin (Aug 17 2023 at 20:21):I tried to follow web api conventions wrt e.g. results, which may make it a little odd-looking to some
Robin Brown (Aug 21 2023 at 13:31):How well do the representation of specialized types map to their despecialized equivalents as defined in e.g. the Canonical ABI doc?
Lann Martin (Aug 21 2023 at 13:47):Not well; I prioritized concision and some broad "JSON conventionality"
Lann Martin (Aug 21 2023 at 13:49):Note though that WIT itself can't represent all of the despecialized equivalents since several of them use numeric field/variant labels.
Lann Martin (Sep 12 2023 at 20:17):I have an initial implementation of the above serialization format: https://github.com/lann/wasmtime-component-serde
Dan Gohman (Sep 12 2023 at 20:34):Cool!
Dan Gohman (Sep 12 2023 at 20:34):Perhaps at some point we should move wasmtime::component::{Type, Val} out into a separate crate so that tools like this can use them without pulling in all of wasmtime
Lann Martin (Sep 12 2023 at 20:37):You currently can't construct recursively-defined Types without instantiating a (dummy) component either.
Lann Martin (Sep 12 2023 at 20:37):At least not via publicly documented interfaces that I've seen.
Lann Martin (Sep 12 2023 at 20:39):I had to resort to this and this to test complex types.
Dan Gohman (Sep 12 2023 at 20:49):I'm a little surprised serde-json doesn't handle things like serializing big numbers or Infinity into strings automatically. I think that means that the comment is right; we may eventually need different serde serializations for different backends.
Pat Hickey (Sep 12 2023 at 21:14):wrt moving component::{Type, Val} out to a separate crate, it would also be really cool if we could move the Lift, Lower, ComponentVal traits as well, so that wasmtime-wit-bindgen wouldnt actually imply a dependency on wasmtime unless the user wants it. that would let us make wasmtime-wasi work across runtimes again
Pat Hickey (Sep 12 2023 at 21:15):well, again as in, like wasi-common did before i got rid of lucet compatibility in wiggle.
Pat Hickey (Sep 12 2023 at 21:16):i believe the story was that wasm3 was using wasi-common somewhere? tbh i cant remember who reported they were sad that i broke it
Pat Hickey (Sep 12 2023 at 21:18):but idk, maybe the counter-argument is that ComponentVal is a huge chunk of the component runtime's complexity and it cant be extracted. i havent tried to do it.
Last updated: Dec 23 2024 at 13:07 UTC