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use futures_util::future::BoxFuture;
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use futures_util::FutureExt;
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use giterated_abi::{FfiFuture, FfiValue, FfiValueMut, RuntimeFuturePoll};
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use std::{
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cell::UnsafeCell,
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future::Future,
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marker::PhantomData,
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mem::transmute,
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task::{Context, RawWaker, RawWakerVTable, Waker},
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};
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use crate::{callback::RuntimeState, new_stack::PluginState, FFIBox};
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#[repr(C)]
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pub struct RuntimeWakerCallback {
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callback: PluginState,
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waker_func: unsafe extern "C" fn(PluginState),
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}
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pub struct WakerState {
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waker: Waker,
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}
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unsafe extern "C" fn wake(_waker: PluginState) {}
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pub struct LocalRuntimeFuture<Output> {
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inner: BoxFuture<'static, Output>,
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runtime_future: UnsafeCell<FfiFuture<Output>>,
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}
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unsafe impl<Output> Send for LocalRuntimeFuture<Output> where Output: Send {}
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unsafe impl<Output> Sync for LocalRuntimeFuture<Output> where Output: Sync {}
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impl<Output> LocalRuntimeFuture<Output> {
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pub fn finalize(self) {}
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pub fn into_runtime(&self) -> FfiFuture<Output> {
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todo!()
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}
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}
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pub trait RuntimeFuturesExt {
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fn spawn_future<Output, F: Future<Output = Output> + Send + Sync + 'static>(
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&self,
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future: F,
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) -> RuntimeFuture<Output>;
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}
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impl RuntimeFuturesExt for RuntimeState {
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fn spawn_future<Output, F: Future<Output = Output> + Send + Sync + 'static>(
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&self,
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future: F,
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) -> RuntimeFuture<Output> {
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let type_eraser = async move {
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let result = future.await;
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FFIBox::from_box(Box::new(result)).untyped()
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};
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let runtime_future = unsafe { FfiFuture::from_raw(poll_local, type_eraser.boxed()) };
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RuntimeFuture(runtime_future)
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}
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}
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unsafe extern "C" fn poll_local(
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_future: FfiValueMut<FfiFuture<()>>,
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mut future_state: FfiValueMut<()>,
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) -> RuntimeFuturePoll {
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let mut future_state: FfiValueMut<BoxFuture<'static, FfiValue<()>>> = transmute(future_state);
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let runtime_future = future_state.as_ref();
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let raw_waker = RawWaker::new(
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Box::into_raw(Box::new(runtime_future)) as *const (),
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&RUNTIME_FUTURE_WAKER_VTABLE,
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);
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let waker = unsafe { Waker::from_raw(raw_waker) };
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let poll_result = future_state.poll_unpin(&mut Context::from_waker(&waker));
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match poll_result {
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std::task::Poll::Ready(result) => RuntimeFuturePoll::Ready(result),
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std::task::Poll::Pending => RuntimeFuturePoll::Pending,
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}
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}
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pub static RUNTIME_FUTURE_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(
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runtime_waker_vtable::waker_clone,
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runtime_waker_vtable::waker_wake,
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runtime_waker_vtable::waker_wake_by_ref,
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runtime_waker_vtable::waker_drop,
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);
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mod runtime_waker_vtable {
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use std::task::RawWaker;
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pub unsafe fn waker_clone(_data: *const ()) -> RawWaker {
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todo!()
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}
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pub unsafe fn waker_wake(_data: *const ()) {
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todo!()
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}
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pub unsafe fn waker_wake_by_ref(_data: *const ()) {
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todo!()
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}
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pub unsafe fn waker_drop(_data: *const ()) {
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}
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}
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#[repr(transparent)]
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pub struct RuntimeFuture<Output>(FfiFuture<Output>);
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impl<Output: Unpin> Future for RuntimeFuture<Output> {
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type Output = Output;
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fn poll(
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mut self: std::pin::Pin<&mut Self>,
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cx: &mut Context<'_>,
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) -> std::task::Poll<Self::Output> {
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let waker_state = WakerState {
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waker: cx.waker().clone(),
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};
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let waker_state = PluginState::from(waker_state);
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unsafe { self.0.write_waker(wake_local, waker_state) };
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match unsafe { self.0.poll() } {
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RuntimeFuturePoll::Ready(result) => {
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let result: FfiValue<Output> = unsafe { transmute(result) };
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std::task::Poll::Ready(result.take())
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}
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RuntimeFuturePoll::Pending => std::task::Poll::Pending,
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}
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}
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}
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unsafe extern "C" fn wake_local(future: FfiValueMut<FfiFuture<()>>, state: FfiValueMut<()>) {
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todo!()
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}
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