use futures_01::executor::{
spawn as spawn01, Notify as Notify01, NotifyHandle as NotifyHandle01,
Spawn as Spawn01, UnsafeNotify as UnsafeNotify01,
};
use futures_01::{
Async as Async01, AsyncSink as AsyncSink01, Future as Future01,
Sink as Sink01, Stream as Stream01,
};
use futures_core::{task as task03, Future as Future03, Stream as Stream03};
use std::pin::Pin;
use std::task::Context;
use futures_sink::Sink as Sink03;
#[cfg(feature = "io-compat")]
pub use io::{AsyncRead01CompatExt, AsyncWrite01CompatExt};
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct Compat01As03<T> {
pub(crate) inner: Spawn01<T>,
}
impl<T> Unpin for Compat01As03<T> {}
impl<T> Compat01As03<T> {
pub fn new(object: T) -> Compat01As03<T> {
Compat01As03 {
inner: spawn01(object),
}
}
fn in_notify<R>(&mut self, cx: &mut Context<'_>, f: impl FnOnce(&mut T) -> R) -> R {
let notify = &WakerToHandle(cx.waker());
self.inner.poll_fn_notify(notify, 0, f)
}
pub fn get_ref(&self) -> &T {
self.inner.get_ref()
}
}
pub trait Future01CompatExt: Future01 {
fn compat(self) -> Compat01As03<Self>
where
Self: Sized,
{
Compat01As03::new(self)
}
}
impl<Fut: Future01> Future01CompatExt for Fut {}
pub trait Stream01CompatExt: Stream01 {
fn compat(self) -> Compat01As03<Self>
where
Self: Sized,
{
Compat01As03::new(self)
}
}
impl<St: Stream01> Stream01CompatExt for St {}
pub trait Sink01CompatExt: Sink01 {
fn sink_compat(self) -> Compat01As03Sink<Self, Self::SinkItem>
where
Self: Sized,
{
Compat01As03Sink::new(self)
}
}
impl<Si: Sink01> Sink01CompatExt for Si {}
fn poll_01_to_03<T, E>(x: Result<Async01<T>, E>) -> task03::Poll<Result<T, E>> {
match x {
Ok(Async01::Ready(t)) => task03::Poll::Ready(Ok(t)),
Ok(Async01::NotReady) => task03::Poll::Pending,
Err(e) => task03::Poll::Ready(Err(e)),
}
}
impl<Fut: Future01> Future03 for Compat01As03<Fut> {
type Output = Result<Fut::Item, Fut::Error>;
fn poll(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Self::Output> {
poll_01_to_03(self.in_notify(cx, Future01::poll))
}
}
impl<St: Stream01> Stream03 for Compat01As03<St> {
type Item = Result<St::Item, St::Error>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Option<Self::Item>> {
match self.in_notify(cx, Stream01::poll) {
Ok(Async01::Ready(Some(t))) => task03::Poll::Ready(Some(Ok(t))),
Ok(Async01::Ready(None)) => task03::Poll::Ready(None),
Ok(Async01::NotReady) => task03::Poll::Pending,
Err(e) => task03::Poll::Ready(Some(Err(e))),
}
}
}
#[derive(Debug)]
#[must_use = "sinks do nothing unless polled"]
pub struct Compat01As03Sink<S, SinkItem> {
pub(crate) inner: Spawn01<S>,
pub(crate) buffer: Option<SinkItem>,
pub(crate) close_started: bool,
}
impl<S, SinkItem> Unpin for Compat01As03Sink<S, SinkItem> {}
impl<S, SinkItem> Compat01As03Sink<S, SinkItem> {
pub fn new(inner: S) -> Compat01As03Sink<S, SinkItem> {
Compat01As03Sink {
inner: spawn01(inner),
buffer: None,
close_started: false
}
}
fn in_notify<R>(
&mut self,
cx: &mut Context<'_>,
f: impl FnOnce(&mut S) -> R,
) -> R {
let notify = &WakerToHandle(cx.waker());
self.inner.poll_fn_notify(notify, 0, f)
}
pub fn get_ref(&self) -> &S {
self.inner.get_ref()
}
}
impl<S, SinkItem> Stream03 for Compat01As03Sink<S, SinkItem>
where
S: Stream01,
{
type Item = Result<S::Item, S::Error>;
fn poll_next(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Option<Self::Item>> {
match self.in_notify(cx, Stream01::poll) {
Ok(Async01::Ready(Some(t))) => task03::Poll::Ready(Some(Ok(t))),
Ok(Async01::Ready(None)) => task03::Poll::Ready(None),
Ok(Async01::NotReady) => task03::Poll::Pending,
Err(e) => task03::Poll::Ready(Some(Err(e))),
}
}
}
impl<S, SinkItem> Sink03<SinkItem> for Compat01As03Sink<S, SinkItem>
where
S: Sink01<SinkItem = SinkItem>,
{
type SinkError = S::SinkError;
fn start_send(
mut self: Pin<&mut Self>,
item: SinkItem,
) -> Result<(), Self::SinkError> {
debug_assert!(self.buffer.is_none());
self.buffer = Some(item);
Ok(())
}
fn poll_ready(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Result<(), Self::SinkError>> {
match self.buffer.take() {
Some(item) => match self.in_notify(cx, |f| f.start_send(item)) {
Ok(AsyncSink01::Ready) => task03::Poll::Ready(Ok(())),
Ok(AsyncSink01::NotReady(i)) => {
self.buffer = Some(i);
task03::Poll::Pending
}
Err(e) => task03::Poll::Ready(Err(e)),
},
None => task03::Poll::Ready(Ok(())),
}
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Result<(), Self::SinkError>> {
let item = self.buffer.take();
match self.in_notify(cx, |f| match item {
Some(i) => match f.start_send(i) {
Ok(AsyncSink01::Ready) => f.poll_complete().map(|i| (i, None)),
Ok(AsyncSink01::NotReady(t)) => {
Ok((Async01::NotReady, Some(t)))
}
Err(e) => Err(e),
},
None => f.poll_complete().map(|i| (i, None)),
}) {
Ok((Async01::Ready(_), _)) => task03::Poll::Ready(Ok(())),
Ok((Async01::NotReady, item)) => {
self.buffer = item;
task03::Poll::Pending
}
Err(e) => task03::Poll::Ready(Err(e)),
}
}
fn poll_close(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> task03::Poll<Result<(), Self::SinkError>> {
let item = self.buffer.take();
let close_started = self.close_started;
let result = self.in_notify(cx, |f| {
if !close_started {
if let Some(item) = item {
if let AsyncSink01::NotReady(item) = f.start_send(item)? {
return Ok((Async01::NotReady, Some(item), false));
}
}
if let Async01::NotReady = f.poll_complete()? {
return Ok((Async01::NotReady, None, false));
}
}
Ok((<S as Sink01>::close(f)?, None, true))
});
match result {
Ok((Async01::Ready(_), _, _)) => task03::Poll::Ready(Ok(())),
Ok((Async01::NotReady, item, close_started)) => {
self.buffer = item;
self.close_started = close_started;
task03::Poll::Pending
}
Err(e) => task03::Poll::Ready(Err(e)),
}
}
}
struct NotifyWaker(task03::Waker);
#[derive(Clone)]
struct WakerToHandle<'a>(&'a task03::Waker);
impl<'a> From<WakerToHandle<'a>> for NotifyHandle01 {
fn from(handle: WakerToHandle<'a>) -> NotifyHandle01 {
let ptr = Box::new(NotifyWaker(handle.0.clone()));
unsafe { NotifyHandle01::new(Box::into_raw(ptr)) }
}
}
impl Notify01 for NotifyWaker {
fn notify(&self, _: usize) {
self.0.wake_by_ref();
}
}
unsafe impl UnsafeNotify01 for NotifyWaker {
unsafe fn clone_raw(&self) -> NotifyHandle01 {
WakerToHandle(&self.0).into()
}
unsafe fn drop_raw(&self) {
let ptr: *const dyn UnsafeNotify01 = self;
drop(Box::from_raw(ptr as *mut dyn UnsafeNotify01));
}
}
#[cfg(feature = "io-compat")]
mod io {
use super::*;
use futures_io::{
AsyncRead as AsyncRead03, AsyncWrite as AsyncWrite03, Initializer,
};
use std::io::Error;
use tokio_io::{AsyncRead as AsyncRead01, AsyncWrite as AsyncWrite01};
pub trait AsyncRead01CompatExt: AsyncRead01 {
fn compat(self) -> Compat01As03<Self>
where
Self: Sized,
{
Compat01As03::new(self)
}
}
impl<R: AsyncRead01> AsyncRead01CompatExt for R {}
pub trait AsyncWrite01CompatExt: AsyncWrite01 {
fn compat(self) -> Compat01As03<Self>
where
Self: Sized,
{
Compat01As03::new(self)
}
}
impl<W: AsyncWrite01> AsyncWrite01CompatExt for W {}
impl<R: AsyncRead01> AsyncRead03 for Compat01As03<R> {
unsafe fn initializer(&self) -> Initializer {
if self.inner.get_ref().prepare_uninitialized_buffer(&mut [1]) {
Initializer::zeroing()
} else {
Initializer::nop()
}
}
fn poll_read(mut self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8])
-> task03::Poll<Result<usize, Error>>
{
poll_01_to_03(self.in_notify(cx, |x| x.poll_read(buf)))
}
}
impl<W: AsyncWrite01> AsyncWrite03 for Compat01As03<W> {
fn poll_write(mut self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8])
-> task03::Poll<Result<usize, Error>>
{
poll_01_to_03(self.in_notify(cx, |x| x.poll_write(buf)))
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>)
-> task03::Poll<Result<(), Error>>
{
poll_01_to_03(self.in_notify(cx, AsyncWrite01::poll_flush))
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>)
-> task03::Poll<Result<(), Error>>
{
poll_01_to_03(self.in_notify(cx, AsyncWrite01::shutdown))
}
}
}