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Code Issues Packages 1 Wiki Activity

fix(napi): Don't run microtasks in napi_resolve_deferred (#25246)

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Fixes an incredibly obscure bug that causes parcel's file watcher to not
get any file update notifications on macOS.

The issue was that the native addon was calling `napi_resolve_deferred`,
but when we resolved the promise, v8 was running microtasks
automatically. That executed JS, which called back into the native addon
and broke the addon's assumption that the call wouldn't be reentrant.
This commit is contained in:
Nathan Whitaker 2024-08-28 13:42:42 -07:00 committed by Luca Casonato
parent 4431dc8f63
commit 834371a592
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GPG key ID: 01A83EB62563811F
1 changed files with 17 additions and 6 deletions
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23
cli/napi/js_native_api.rs
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@ -3307,19 +3307,30 @@ fn napi_resolve_deferred(
check_arg!(env, result);
check_arg!(env, deferred);
// Make sure microtasks don't run and call back into JS
env
.scope()
.set_microtasks_policy(v8::MicrotasksPolicy::Explicit);
let deferred_ptr =
unsafe { NonNull::new_unchecked(deferred as *mut v8::PromiseResolver) };
let global = unsafe { v8::Global::from_raw(env.isolate(), deferred_ptr) };
let resolver = v8::Local::new(&mut env.scope(), global);
if !resolver
let success = resolver
.resolve(&mut env.scope(), result.unwrap())
.unwrap_or(false)
{
return napi_generic_failure;
}
.unwrap_or(false);
napi_ok
// Restore policy
env
.scope()
.set_microtasks_policy(v8::MicrotasksPolicy::Auto);
if success {
napi_ok
} else {
napi_generic_failure
}
}
#[napi_sym]