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webassembly/proxy_js: Promote Python thenable to a Promise.

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Signed-off-by: Damien George <damien@micropython.org>
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Damien George
2024-03-29 23:07:39 +11:00
parent 3997532186
commit 7c62fbe3f2
3 changed files with 55 additions and 1 deletions
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17
ports/webassembly/proxy_js.js
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@@ -89,7 +89,22 @@ function proxy_call_python(target, argumentsList) {
if (argumentsList.length > 0) {
Module._free(args);
}
return proxy_convert_mp_to_js_obj_jsside_with_free(value);
const ret = proxy_convert_mp_to_js_obj_jsside_with_free(value);
if (ret instanceof PyProxyThenable) {
// In Python when an async function is called it creates the
// corresponding "generator", which must then be executed at
// the top level by an asyncio-like scheduler. In JavaScript
// the semantics for async functions is that they are started
// immediately (their non-async prefix code is executed immediately)
// and only if they await do they return a Promise to delay the
// execution of the remainder of the function.
//
// Emulate the JavaScript behaviour here by resolving the Python
// async function. We assume that the caller who gets this
// return is JavaScript.
return Promise.resolve(ret);
}
return ret;
}
function proxy_convert_js_to_mp_obj_jsside(js_obj, out) {