Trait napi::Task

source · 
pub trait Task: Send + Sized {
    type Output: Send + Sized + 'static;
    type JsValue: ToNapiValue + TypeName;

    fn compute(&mut self) -> Result<Self::Output>;
    fn resolve(&mut self, env: Env, output: Self::Output) -> Result<Self::JsValue>;

    fn reject(&mut self, _env: Env, err: Error) -> Result<Self::JsValue> { ... }
    fn finally(&mut self, _env: Env) -> Result<()> { ... }
}

Required Associated Types§

Required Methods§

Compute logic in libuv thread

Into this method if compute return Ok

Provided Methods§

Into this method if compute return Err

Examples found in repository?
src/async_work.rs (line 126)
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153

unsafe extern "C" fn complete<T: Task>(
  env: sys::napi_env,
  status: sys::napi_status,
  data: *mut c_void,
) {
  let mut work = unsafe { Box::from_raw(data as *mut AsyncWork<T>) };
  let value_ptr = mem::replace(&mut work.value, Ok(mem::MaybeUninit::zeroed()));
  let deferred = mem::replace(&mut work.deferred, ptr::null_mut());
  let napi_async_work = mem::replace(&mut work.napi_async_work, ptr::null_mut());
  let value = match value_ptr {
    Ok(v) => {
      let output = unsafe { v.assume_init() };
      work
        .inner_task
        .resolve(unsafe { Env::from_raw(env) }, output)
    }
    Err(e) => work.inner_task.reject(unsafe { Env::from_raw(env) }, e),
  };
  if status != sys::Status::napi_cancelled && work.status.load(Ordering::Relaxed) != 2 {
    match check_status!(status)
      .and_then(move |_| value)
      .and_then(|v| unsafe { ToNapiValue::to_napi_value(env, v) })
    {
      Ok(v) => {
        let status = unsafe { sys::napi_resolve_deferred(env, deferred, v) };
        debug_assert!(status == sys::Status::napi_ok, "Resolve promise failed");
      }
      Err(e) => {
        let status =
          unsafe { sys::napi_reject_deferred(env, deferred, JsError::from(e).into_value(env)) };
        debug_assert!(status == sys::Status::napi_ok, "Reject promise failed");
      }
    };
  }
  if let Err(e) = work.inner_task.finally(unsafe { Env::from_raw(env) }) {
    debug_assert!(false, "Panic in Task finally fn: {:?}", e);
  }
  let delete_status = unsafe { sys::napi_delete_async_work(env, napi_async_work) };
  debug_assert!(
    delete_status == sys::Status::napi_ok,
    "Delete async work failed"
  );
  work.status.store(1, Ordering::Relaxed);
}
Examples found in repository?
src/async_work.rs (line 144)
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153

unsafe extern "C" fn complete<T: Task>(
  env: sys::napi_env,
  status: sys::napi_status,
  data: *mut c_void,
) {
  let mut work = unsafe { Box::from_raw(data as *mut AsyncWork<T>) };
  let value_ptr = mem::replace(&mut work.value, Ok(mem::MaybeUninit::zeroed()));
  let deferred = mem::replace(&mut work.deferred, ptr::null_mut());
  let napi_async_work = mem::replace(&mut work.napi_async_work, ptr::null_mut());
  let value = match value_ptr {
    Ok(v) => {
      let output = unsafe { v.assume_init() };
      work
        .inner_task
        .resolve(unsafe { Env::from_raw(env) }, output)
    }
    Err(e) => work.inner_task.reject(unsafe { Env::from_raw(env) }, e),
  };
  if status != sys::Status::napi_cancelled && work.status.load(Ordering::Relaxed) != 2 {
    match check_status!(status)
      .and_then(move |_| value)
      .and_then(|v| unsafe { ToNapiValue::to_napi_value(env, v) })
    {
      Ok(v) => {
        let status = unsafe { sys::napi_resolve_deferred(env, deferred, v) };
        debug_assert!(status == sys::Status::napi_ok, "Resolve promise failed");
      }
      Err(e) => {
        let status =
          unsafe { sys::napi_reject_deferred(env, deferred, JsError::from(e).into_value(env)) };
        debug_assert!(status == sys::Status::napi_ok, "Reject promise failed");
      }
    };
  }
  if let Err(e) = work.inner_task.finally(unsafe { Env::from_raw(env) }) {
    debug_assert!(false, "Panic in Task finally fn: {:?}", e);
  }
  let delete_status = unsafe { sys::napi_delete_async_work(env, napi_async_work) };
  debug_assert!(
    delete_status == sys::Status::napi_ok,
    "Delete async work failed"
  );
  work.status.store(1, Ordering::Relaxed);
}

Implementors§