use std::{future::Future, sync::RwLock};
use once_cell::sync::Lazy;
use tokio::runtime::Runtime;
use crate::{sys, JsDeferred, JsUnknown, NapiValue, Result};
fn create_runtime() -> Option<Runtime> {
#[cfg(not(target_arch = "wasm32"))]
{
let runtime = tokio::runtime::Runtime::new().expect("Create tokio runtime failed");
Some(runtime)
}
#[cfg(target_arch = "wasm32")]
{
tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.ok()
}
}
pub(crate) static RT: Lazy<RwLock<Option<Runtime>>> = Lazy::new(|| RwLock::new(create_runtime()));
#[cfg(windows)]
pub(crate) static RT_REFERENCE_COUNT: std::sync::atomic::AtomicUsize =
std::sync::atomic::AtomicUsize::new(0);
#[cfg(windows)]
pub(crate) fn ensure_runtime() {
let mut rt = RT.write().unwrap();
if rt.is_none() {
*rt = create_runtime();
}
}
#[cfg(windows)]
pub(crate) unsafe extern "C" fn drop_runtime(arg: *mut std::ffi::c_void) {
use std::sync::atomic::Ordering;
if RT_REFERENCE_COUNT.fetch_sub(1, Ordering::SeqCst) == 1 {
RT.write().unwrap().take();
}
unsafe {
let env: sys::napi_env = arg as *mut sys::napi_env__;
sys::napi_remove_env_cleanup_hook(env, Some(drop_runtime), arg);
}
}
pub fn spawn<F>(fut: F) -> tokio::task::JoinHandle<F::Output>
where
F: 'static + Send + Future<Output = ()>,
{
RT.read().unwrap().as_ref().unwrap().spawn(fut)
}
pub fn block_on<F>(fut: F) -> F::Output
where
F: 'static + Send + Future<Output = ()>,
{
RT.read().unwrap().as_ref().unwrap().block_on(fut)
}
#[inline]
pub fn within_runtime_if_available<F: FnOnce() -> T, T>(f: F) -> T {
let _rt_guard = RT.read().unwrap().as_ref().unwrap().enter();
f()
}
#[allow(clippy::not_unsafe_ptr_arg_deref)]
pub fn execute_tokio_future<
Data: 'static + Send,
Fut: 'static + Send + Future<Output = Result<Data>>,
Resolver: 'static + Send + Sync + FnOnce(sys::napi_env, Data) -> Result<sys::napi_value>,
>(
env: sys::napi_env,
fut: Fut,
resolver: Resolver,
) -> Result<sys::napi_value> {
let (deferred, promise) = JsDeferred::new(env)?;
let inner = async move {
match fut.await {
Ok(v) => deferred.resolve(|env| {
resolver(env.raw(), v).map(|v| unsafe { JsUnknown::from_raw_unchecked(env.raw(), v) })
}),
Err(e) => deferred.reject(e),
}
};
#[cfg(not(target_arch = "wasm32"))]
spawn(inner);
#[cfg(target_arch = "wasm32")]
block_on(inner);
Ok(promise.0.value)
}