1 files changed, 265 insertions, 0 deletions
diff --git a/vendor/futures-util/src/compat/compat03as01.rs b/vendor/futures-util/src/compat/compat03as01.rs
new file mode 100644
index 000000000..5d3a6e920
--- /dev/null
+++ b/vendor/futures-util/src/compat/compat03as01.rs
@@ -0,0 +1,265 @@
+use crate::task::{self as task03, ArcWake as ArcWake03, WakerRef};
+use futures_01::{
+    task as task01, Async as Async01, Future as Future01, Poll as Poll01, Stream as Stream01,
+};
+#[cfg(feature = "sink")]
+use futures_01::{AsyncSink as AsyncSink01, Sink as Sink01, StartSend as StartSend01};
+use futures_core::{
+    future::TryFuture as TryFuture03,
+    stream::TryStream as TryStream03,
+    task::{RawWaker, RawWakerVTable},
+};
+#[cfg(feature = "sink")]
+use futures_sink::Sink as Sink03;
+#[cfg(feature = "sink")]
+use std::marker::PhantomData;
+use std::{mem, pin::Pin, sync::Arc, task::Context};
+
+/// Converts a futures 0.3 [`TryFuture`](futures_core::future::TryFuture) or
+/// [`TryStream`](futures_core::stream::TryStream) into a futures 0.1
+/// [`Future`](futures_01::future::Future) or
+/// [`Stream`](futures_01::stream::Stream).
+#[derive(Debug, Clone, Copy)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct Compat<T> {
+    pub(crate) inner: T,
+}
+
+/// Converts a futures 0.3 [`Sink`](futures_sink::Sink) into a futures 0.1
+/// [`Sink`](futures_01::sink::Sink).
+#[cfg(feature = "sink")]
+#[cfg_attr(docsrs, doc(cfg(feature = "sink")))]
+#[derive(Debug)]
+#[must_use = "sinks do nothing unless polled"]
+pub struct CompatSink<T, Item> {
+    inner: T,
+    _phantom: PhantomData<fn(Item)>,
+}
+
+impl<T> Compat<T> {
+    /// Creates a new [`Compat`].
+    ///
+    /// For types which implement appropriate futures `0.3`
+    /// traits, the result will be a type which implements
+    /// the corresponding futures 0.1 type.
+    pub fn new(inner: T) -> Self {
+        Self { inner }
+    }
+
+    /// Get a reference to 0.3 Future, Stream, AsyncRead, or AsyncWrite object
+    /// contained within.
+    pub fn get_ref(&self) -> &T {
+        &self.inner
+    }
+
+    /// Get a mutable reference to 0.3 Future, Stream, AsyncRead, or AsyncWrite object
+    /// contained within.
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner
+    }
+
+    /// Returns the inner item.
+    pub fn into_inner(self) -> T {
+        self.inner
+    }
+}
+
+#[cfg(feature = "sink")]
+impl<T, Item> CompatSink<T, Item> {
+    /// Creates a new [`CompatSink`].
+    pub fn new(inner: T) -> Self {
+        Self { inner, _phantom: PhantomData }
+    }
+
+    /// Get a reference to 0.3 Sink contained within.
+    pub fn get_ref(&self) -> &T {
+        &self.inner
+    }
+
+    /// Get a mutable reference to 0.3 Sink contained within.
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner
+    }
+
+    /// Returns the inner item.
+    pub fn into_inner(self) -> T {
+        self.inner
+    }
+}
+
+fn poll_03_to_01<T, E>(x: task03::Poll<Result<T, E>>) -> Result<Async01<T>, E> {
+    match x? {
+        task03::Poll::Ready(t) => Ok(Async01::Ready(t)),
+        task03::Poll::Pending => Ok(Async01::NotReady),
+    }
+}
+
+impl<Fut> Future01 for Compat<Fut>
+where
+    Fut: TryFuture03 + Unpin,
+{
+    type Item = Fut::Ok;
+    type Error = Fut::Error;
+
+    fn poll(&mut self) -> Poll01<Self::Item, Self::Error> {
+        with_context(self, |inner, cx| poll_03_to_01(inner.try_poll(cx)))
+    }
+}
+
+impl<St> Stream01 for Compat<St>
+where
+    St: TryStream03 + Unpin,
+{
+    type Item = St::Ok;
+    type Error = St::Error;
+
+    fn poll(&mut self) -> Poll01<Option<Self::Item>, Self::Error> {
+        with_context(self, |inner, cx| match inner.try_poll_next(cx)? {
+            task03::Poll::Ready(None) => Ok(Async01::Ready(None)),
+            task03::Poll::Ready(Some(t)) => Ok(Async01::Ready(Some(t))),
+            task03::Poll::Pending => Ok(Async01::NotReady),
+        })
+    }
+}
+
+#[cfg(feature = "sink")]
+impl<T, Item> Sink01 for CompatSink<T, Item>
+where
+    T: Sink03<Item> + Unpin,
+{
+    type SinkItem = Item;
+    type SinkError = T::Error;
+
+    fn start_send(&mut self, item: Self::SinkItem) -> StartSend01<Self::SinkItem, Self::SinkError> {
+        with_sink_context(self, |mut inner, cx| match inner.as_mut().poll_ready(cx)? {
+            task03::Poll::Ready(()) => inner.start_send(item).map(|()| AsyncSink01::Ready),
+            task03::Poll::Pending => Ok(AsyncSink01::NotReady(item)),
+        })
+    }
+
+    fn poll_complete(&mut self) -> Poll01<(), Self::SinkError> {
+        with_sink_context(self, |inner, cx| poll_03_to_01(inner.poll_flush(cx)))
+    }
+
+    fn close(&mut self) -> Poll01<(), Self::SinkError> {
+        with_sink_context(self, |inner, cx| poll_03_to_01(inner.poll_close(cx)))
+    }
+}
+
+#[derive(Clone)]
+struct Current(task01::Task);
+
+impl Current {
+    fn new() -> Self {
+        Self(task01::current())
+    }
+
+    fn as_waker(&self) -> WakerRef<'_> {
+        unsafe fn ptr_to_current<'a>(ptr: *const ()) -> &'a Current {
+            &*(ptr as *const Current)
+        }
+        fn current_to_ptr(current: &Current) -> *const () {
+            current as *const Current as *const ()
+        }
+
+        unsafe fn clone(ptr: *const ()) -> RawWaker {
+            // Lazily create the `Arc` only when the waker is actually cloned.
+            // FIXME: remove `transmute` when a `Waker` -> `RawWaker` conversion
+            // function is landed in `core`.
+            mem::transmute::<task03::Waker, RawWaker>(task03::waker(Arc::new(
+                ptr_to_current(ptr).clone(),
+            )))
+        }
+        unsafe fn drop(_: *const ()) {}
+        unsafe fn wake(ptr: *const ()) {
+            ptr_to_current(ptr).0.notify()
+        }
+
+        let ptr = current_to_ptr(self);
+        let vtable = &RawWakerVTable::new(clone, wake, wake, drop);
+        WakerRef::new_unowned(std::mem::ManuallyDrop::new(unsafe {
+            task03::Waker::from_raw(RawWaker::new(ptr, vtable))
+        }))
+    }
+}
+
+impl ArcWake03 for Current {
+    fn wake_by_ref(arc_self: &Arc<Self>) {
+        arc_self.0.notify();
+    }
+}
+
+fn with_context<T, R, F>(compat: &mut Compat<T>, f: F) -> R
+where
+    T: Unpin,
+    F: FnOnce(Pin<&mut T>, &mut Context<'_>) -> R,
+{
+    let current = Current::new();
+    let waker = current.as_waker();
+    let mut cx = Context::from_waker(&waker);
+    f(Pin::new(&mut compat.inner), &mut cx)
+}
+
+#[cfg(feature = "sink")]
+fn with_sink_context<T, Item, R, F>(compat: &mut CompatSink<T, Item>, f: F) -> R
+where
+    T: Unpin,
+    F: FnOnce(Pin<&mut T>, &mut Context<'_>) -> R,
+{
+    let current = Current::new();
+    let waker = current.as_waker();
+    let mut cx = Context::from_waker(&waker);
+    f(Pin::new(&mut compat.inner), &mut cx)
+}
+
+#[cfg(feature = "io-compat")]
+#[cfg_attr(docsrs, doc(cfg(feature = "io-compat")))]
+mod io {
+    use super::*;
+    use futures_io::{AsyncRead as AsyncRead03, AsyncWrite as AsyncWrite03};
+    use tokio_io::{AsyncRead as AsyncRead01, AsyncWrite as AsyncWrite01};
+
+    fn poll_03_to_io<T>(x: task03::Poll<Result<T, std::io::Error>>) -> Result<T, std::io::Error> {
+        match x {
+            task03::Poll::Ready(Ok(t)) => Ok(t),
+            task03::Poll::Pending => Err(std::io::ErrorKind::WouldBlock.into()),
+            task03::Poll::Ready(Err(e)) => Err(e),
+        }
+    }
+
+    impl<R: AsyncRead03 + Unpin> std::io::Read for Compat<R> {
+        fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+            let current = Current::new();
+            let waker = current.as_waker();
+            let mut cx = Context::from_waker(&waker);
+            poll_03_to_io(Pin::new(&mut self.inner).poll_read(&mut cx, buf))
+        }
+    }
+
+    impl<R: AsyncRead03 + Unpin> AsyncRead01 for Compat<R> {}
+
+    impl<W: AsyncWrite03 + Unpin> std::io::Write for Compat<W> {
+        fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+            let current = Current::new();
+            let waker = current.as_waker();
+            let mut cx = Context::from_waker(&waker);
+            poll_03_to_io(Pin::new(&mut self.inner).poll_write(&mut cx, buf))
+        }
+
+        fn flush(&mut self) -> std::io::Result<()> {
+            let current = Current::new();
+            let waker = current.as_waker();
+            let mut cx = Context::from_waker(&waker);
+            poll_03_to_io(Pin::new(&mut self.inner).poll_flush(&mut cx))
+        }
+    }
+
+    impl<W: AsyncWrite03 + Unpin> AsyncWrite01 for Compat<W> {
+        fn shutdown(&mut self) -> std::io::Result<Async01<()>> {
+            let current = Current::new();
+            let waker = current.as_waker();
+            let mut cx = Context::from_waker(&waker);
+            poll_03_to_01(Pin::new(&mut self.inner).poll_close(&mut cx))
+        }
+    }
+}