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use std::ffi::c_void;
use std::ptr;
use std::rc::Rc;
use std::sync::atomic::{AtomicPtr, AtomicU8, Ordering};
use super::{FromNapiValue, ToNapiValue, TypeName};
use crate::{
async_work, check_status, sys, Env, Error, JsError, JsObject, NapiValue, Status, Task,
};
pub struct AsyncTask<T: Task> {
inner: T,
abort_signal: Option<AbortSignal>,
}
impl<T: Task> TypeName for T {
fn type_name() -> &'static str {
"AsyncTask"
}
fn value_type() -> crate::ValueType {
crate::ValueType::Object
}
}
impl<T: Task> AsyncTask<T> {
pub fn new(task: T) -> Self {
Self {
inner: task,
abort_signal: None,
}
}
pub fn with_signal(task: T, signal: AbortSignal) -> Self {
Self {
inner: task,
abort_signal: Some(signal),
}
}
pub fn with_optional_signal(task: T, signal: Option<AbortSignal>) -> Self {
Self {
inner: task,
abort_signal: signal,
}
}
}
pub struct AbortSignal {
raw_work: Rc<AtomicPtr<sys::napi_async_work__>>,
raw_deferred: Rc<AtomicPtr<sys::napi_deferred__>>,
status: Rc<AtomicU8>,
}
impl FromNapiValue for AbortSignal {
unsafe fn from_napi_value(env: sys::napi_env, napi_val: sys::napi_value) -> crate::Result<Self> {
let mut signal = unsafe { JsObject::from_raw_unchecked(env, napi_val) };
let async_work_inner: Rc<AtomicPtr<sys::napi_async_work__>> =
Rc::new(AtomicPtr::new(ptr::null_mut()));
let raw_promise: Rc<AtomicPtr<sys::napi_deferred__>> = Rc::new(AtomicPtr::new(ptr::null_mut()));
let task_status = Rc::new(AtomicU8::new(0));
let abort_controller = AbortSignal {
raw_work: async_work_inner.clone(),
raw_deferred: raw_promise.clone(),
status: task_status.clone(),
};
let js_env = unsafe { Env::from_raw(env) };
check_status!(unsafe {
sys::napi_wrap(
env,
signal.0.value,
Box::into_raw(Box::new(abort_controller)) as *mut _,
Some(async_task_abort_controller_finalize),
ptr::null_mut(),
ptr::null_mut(),
)
})?;
signal.set_named_property("onabort", js_env.create_function("onabort", on_abort)?)?;
Ok(AbortSignal {
raw_work: async_work_inner,
raw_deferred: raw_promise,
status: task_status,
})
}
}
extern "C" fn on_abort(
env: sys::napi_env,
callback_info: sys::napi_callback_info,
) -> sys::napi_value {
let mut this = ptr::null_mut();
unsafe {
let get_cb_info_status = sys::napi_get_cb_info(
env,
callback_info,
&mut 0,
ptr::null_mut(),
&mut this,
ptr::null_mut(),
);
debug_assert_eq!(
get_cb_info_status,
sys::Status::napi_ok,
"{}",
"Get callback info in AbortController abort callback failed"
);
let mut async_task = ptr::null_mut();
let status = sys::napi_unwrap(env, this, &mut async_task);
debug_assert_eq!(
status,
sys::Status::napi_ok,
"{}",
"Unwrap async_task from AbortSignal failed"
);
let abort_controller = Box::leak(Box::from_raw(async_task as *mut AbortSignal));
if abort_controller.status.load(Ordering::Relaxed) == 1 {
return ptr::null_mut();
}
let raw_async_work = abort_controller.raw_work.load(Ordering::Relaxed);
let deferred = abort_controller.raw_deferred.load(Ordering::Relaxed);
sys::napi_cancel_async_work(env, raw_async_work);
abort_controller.status.store(2, Ordering::Relaxed);
let abort_error = Error::new(Status::Cancelled, "AbortError".to_owned());
let reject_status =
sys::napi_reject_deferred(env, deferred, JsError::from(abort_error).into_value(env));
debug_assert_eq!(
reject_status,
sys::Status::napi_ok,
"{}",
"Reject AbortError failed"
);
}
ptr::null_mut()
}
impl<T: Task> ToNapiValue for AsyncTask<T> {
unsafe fn to_napi_value(env: sys::napi_env, val: Self) -> crate::Result<sys::napi_value> {
if let Some(abort_controller) = val.abort_signal {
let async_promise = async_work::run(env, val.inner, Some(abort_controller.status.clone()))?;
abort_controller
.raw_work
.store(async_promise.napi_async_work, Ordering::Relaxed);
abort_controller
.raw_deferred
.store(async_promise.deferred, Ordering::Relaxed);
Ok(async_promise.promise_object().0.value)
} else {
let async_promise = async_work::run(env, val.inner, None)?;
Ok(async_promise.promise_object().0.value)
}
}
}
unsafe extern "C" fn async_task_abort_controller_finalize(
_env: sys::napi_env,
finalize_data: *mut c_void,
_finalize_hint: *mut c_void,
) {
unsafe { Box::from_raw(finalize_data as *mut AbortSignal) };
}