component model: async host function & embedding support #5055
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I've double-checked bits and pieces internally and I think this should generally be good to go. I'm always somewhat wary of async since it's got unsafe underpinnings with fibers and whatnot but I'm at least for now confident enough in this that I'd be happy to merge. |
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Thanks! I just need to write some tests. |
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… accepting a closure We find that this makes the Linker::func_wrap type signature much easier to read. The IntoComponentFunc abstraction was adding a lot of weight to "splat" a set of arguments from a tuple of types into individual arguments to the closure. Additionally, making the StoreContextMut argument optional, or the Result<return> optional, wasn't very worthwhile.
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| store.0.async_support(), | ||
| "cannot use `call_async` without enabling async support in the config" | ||
| ); | ||
| store.on_fiber(|store| self.post_return_impl(store)).await? |
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One day in the future it might be best to conditionally do the fiber business here since many functions might not have a post_return in which case going through all this for a stack is largely overkill. Put another way the stack is only needed here for the crate::Func::call_unchecked_raw call, but this is an optimization we can deal with later.
tests/all/component_model/async.rs
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| (component | ||
| (type $f (func)) | ||
| (type $imports_type | ||
| (instance | ||
| (alias outer 1 0 (type $f)) | ||
| (export "i" (func $f)) | ||
| ) | ||
| ) | ||
| (import "imports" (instance $imports (type $imports_type))) | ||
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| (core module $m | ||
| (import "imports" "i" (func $i)) | ||
| (func (export "thunk") call $i) | ||
| ) | ||
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| (alias export 0 "i" (func $f)) | ||
| (core func $f_lowered (canon lower (func 0))) | ||
| (core instance $imports_core (export "i" (func $f_lowered))) | ||
| (core instance $i (instantiate $m | ||
| (with "imports" (instance $imports_core)))) | ||
| (func (export "thunk") | ||
| (canon lift (core func $i "thunk")) | ||
| ) | ||
| ) |
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You can simplify this a bit with:
(component
(import "i" (func $f))
(core module $m
(import "" "" (func $i))
(func (export "thunk") call $i)
)
(core func $f (canon lower (func $f)))
(core instance $i (instantiate $m
(with "" (instance
(export "" (func $f))
))
))
(func (export "thunk")
(canon lift (core func $i "thunk"))
)
)
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Based on #5065.
This PR adds the async suite of variations on
Linker::wrap_func,Func::call,TypedFunc::call, and the variousinstantiatefunctions, for use in async Rust contexts.This ends up being pretty simple: all of the async store machinery from core wasmtime is straightforward to reuse here.
I created a new test suite at
tests/all/component_model/async.rsto smoke test the new functionality.