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Merge pull request #1274 from napi-rs/weak-reference

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feat(napi): add get and get_mut method on `WeakReference`
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LongYinan 2022-08-17 22:12:02 +08:00 committed by GitHub
commit c4eb51b509
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2 changed files with 27 additions and 2 deletions
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25
crates/napi/src/bindgen_runtime/js_values/value_ref.rs
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@ -180,6 +180,15 @@ impl<T> Clone for WeakReference<T> {
impl<T: 'static> ToNapiValue for WeakReference<T> {
unsafe fn to_napi_value(env: crate::sys::napi_env, val: Self) -> Result<crate::sys::napi_value> {
if Weak::strong_count(&val.finalize_callbacks) == 0 {
return Err(Error::new(
Status::GenericFailure,
format!(
"The original reference that WeakReference<{}> is pointing to is dropped",
std::any::type_name::<T>()
),
));
};
let mut result = std::ptr::null_mut();
check_status!(
unsafe { crate::sys::napi_get_reference_value(env, val.napi_ref, &mut result) },
@ -207,6 +216,22 @@ impl<T: 'static> WeakReference<T> {
Ok(None)
}
}
pub fn get(&self) -> Option<&T> {
if Weak::strong_count(&self.finalize_callbacks) == 0 {
None
} else {
Some(unsafe { Box::leak(Box::from_raw(self.raw)) })
}
}
pub fn get_mut(&mut self) -> Option<&mut T> {
if Weak::strong_count(&self.finalize_callbacks) == 0 {
None
} else {
Some(unsafe { Box::leak(Box::from_raw(self.raw)) })
}
}
}
/// ### Experimental feature