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Adding in async support for start (#1905)

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* Adding in async support for start

* Adding in another test case

* Refactoring the Start trait to be cleaner
This commit is contained in:
Pauan
2019-12-09 18:53:29 +01:00
committed by Alex Crichton
parent b71b136fe8
commit 1c08e2b48b
4 changed files with 88 additions and 6 deletions
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32
crates/backend/src/codegen.rs
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@ -447,17 +447,37 @@ impl TryToTokens for ast::Export {
// since we're returning a promise to JS, and this will implicitly
// require that the function returns a `Future<Output = Result<...>>`
let (ret_ty, ret_expr) = if self.function.r#async {
if self.start {
(
quote! { () },
quote! {
wasm_bindgen_futures::spawn_local(async move {
<#syn_ret as wasm_bindgen::__rt::Start>::start(#ret.await);
})
},
)
} else {
(
quote! { wasm_bindgen::JsValue },
quote! {
wasm_bindgen_futures::future_to_promise(async move {
<#syn_ret as wasm_bindgen::__rt::IntoJsResult>::into_js_result(#ret.await)
}).into()
},
)
}
} else if self.start {
(
quote! { wasm_bindgen::JsValue },
quote! {
wasm_bindgen_futures::future_to_promise(async {
wasm_bindgen::__rt::IntoJsResult::into_js_result(#ret.await)
}).into()
},
quote! { () },
quote! { <#syn_ret as wasm_bindgen::__rt::Start>::start(#ret) },
)
} else {
(quote! { #syn_ret }, quote! { #ret })
};
let projection = quote! { <#ret_ty as wasm_bindgen::convert::ReturnWasmAbi> };
let convert_ret = quote! { #projection::return_abi(#ret_expr) };
let describe_ret = quote! {