1 files changed, 449 insertions, 0 deletions
diff --git a/vendor/futures-util/src/compat/compat01as03.rs b/vendor/futures-util/src/compat/compat01as03.rs
new file mode 100644
index 000000000..754e3d82a
--- /dev/null
+++ b/vendor/futures-util/src/compat/compat01as03.rs
@@ -0,0 +1,449 @@
+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, Future as Future01, Stream as Stream01};
+#[cfg(feature = "sink")]
+use futures_01::{AsyncSink as AsyncSink01, Sink as Sink01};
+use futures_core::{future::Future as Future03, stream::Stream as Stream03, task as task03};
+#[cfg(feature = "sink")]
+use futures_sink::Sink as Sink03;
+use std::pin::Pin;
+use std::task::Context;
+
+#[cfg(feature = "io-compat")]
+#[cfg_attr(docsrs, doc(cfg(feature = "io-compat")))]
+#[allow(unreachable_pub)] // https://github.com/rust-lang/rust/issues/57411
+pub use io::{AsyncRead01CompatExt, AsyncWrite01CompatExt};
+
+/// Converts a futures 0.1 Future, Stream, AsyncRead, or AsyncWrite
+/// object to a futures 0.3-compatible version,
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct Compat01As03<T> {
+    pub(crate) inner: Spawn01<T>,
+}
+
+impl<T> Unpin for Compat01As03<T> {}
+
+impl<T> Compat01As03<T> {
+    /// Wraps a futures 0.1 Future, Stream, AsyncRead, or AsyncWrite
+    /// object in a futures 0.3-compatible wrapper.
+    pub fn new(object: T) -> Self {
+        Self { 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)
+    }
+
+    /// Get a reference to 0.1 Future, Stream, AsyncRead, or AsyncWrite object contained within.
+    pub fn get_ref(&self) -> &T {
+        self.inner.get_ref()
+    }
+
+    /// Get a mutable reference to 0.1 Future, Stream, AsyncRead or AsyncWrite object contained
+    /// within.
+    pub fn get_mut(&mut self) -> &mut T {
+        self.inner.get_mut()
+    }
+
+    /// Consume this wrapper to return the underlying 0.1 Future, Stream, AsyncRead, or
+    /// AsyncWrite object.
+    pub fn into_inner(self) -> T {
+        self.inner.into_inner()
+    }
+}
+
+/// Extension trait for futures 0.1 [`Future`](futures_01::future::Future)
+pub trait Future01CompatExt: Future01 {
+    /// Converts a futures 0.1
+    /// [`Future<Item = T, Error = E>`](futures_01::future::Future)
+    /// into a futures 0.3
+    /// [`Future<Output = Result<T, E>>`](futures_core::future::Future).
+    ///
+    /// ```
+    /// # futures::executor::block_on(async {
+    /// # // TODO: These should be all using `futures::compat`, but that runs up against Cargo
+    /// # // feature issues
+    /// use futures_util::compat::Future01CompatExt;
+    ///
+    /// let future = futures_01::future::ok::<u32, ()>(1);
+    /// assert_eq!(future.compat().await, Ok(1));
+    /// # });
+    /// ```
+    fn compat(self) -> Compat01As03<Self>
+    where
+        Self: Sized,
+    {
+        Compat01As03::new(self)
+    }
+}
+impl<Fut: Future01> Future01CompatExt for Fut {}
+
+/// Extension trait for futures 0.1 [`Stream`](futures_01::stream::Stream)
+pub trait Stream01CompatExt: Stream01 {
+    /// Converts a futures 0.1
+    /// [`Stream<Item = T, Error = E>`](futures_01::stream::Stream)
+    /// into a futures 0.3
+    /// [`Stream<Item = Result<T, E>>`](futures_core::stream::Stream).
+    ///
+    /// ```
+    /// # futures::executor::block_on(async {
+    /// use futures::stream::StreamExt;
+    /// use futures_util::compat::Stream01CompatExt;
+    ///
+    /// let stream = futures_01::stream::once::<u32, ()>(Ok(1));
+    /// let mut stream = stream.compat();
+    /// assert_eq!(stream.next().await, Some(Ok(1)));
+    /// assert_eq!(stream.next().await, None);
+    /// # });
+    /// ```
+    fn compat(self) -> Compat01As03<Self>
+    where
+        Self: Sized,
+    {
+        Compat01As03::new(self)
+    }
+}
+impl<St: Stream01> Stream01CompatExt for St {}
+
+/// Extension trait for futures 0.1 [`Sink`](futures_01::sink::Sink)
+#[cfg(feature = "sink")]
+#[cfg_attr(docsrs, doc(cfg(feature = "sink")))]
+pub trait Sink01CompatExt: Sink01 {
+    /// Converts a futures 0.1
+    /// [`Sink<SinkItem = T, SinkError = E>`](futures_01::sink::Sink)
+    /// into a futures 0.3
+    /// [`Sink<T, Error = E>`](futures_sink::Sink).
+    ///
+    /// ```
+    /// # futures::executor::block_on(async {
+    /// use futures::{sink::SinkExt, stream::StreamExt};
+    /// use futures_util::compat::{Stream01CompatExt, Sink01CompatExt};
+    ///
+    /// let (tx, rx) = futures_01::unsync::mpsc::channel(1);
+    /// let (mut tx, mut rx) = (tx.sink_compat(), rx.compat());
+    ///
+    /// tx.send(1).await.unwrap();
+    /// drop(tx);
+    /// assert_eq!(rx.next().await, Some(Ok(1)));
+    /// assert_eq!(rx.next().await, None);
+    /// # });
+    /// ```
+    fn sink_compat(self) -> Compat01As03Sink<Self, Self::SinkItem>
+    where
+        Self: Sized,
+    {
+        Compat01As03Sink::new(self)
+    }
+}
+#[cfg(feature = "sink")]
+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? {
+        Async01::Ready(t) => task03::Poll::Ready(Ok(t)),
+        Async01::NotReady => task03::Poll::Pending,
+    }
+}
+
+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)? {
+            Async01::Ready(Some(t)) => task03::Poll::Ready(Some(Ok(t))),
+            Async01::Ready(None) => task03::Poll::Ready(None),
+            Async01::NotReady => task03::Poll::Pending,
+        }
+    }
+}
+
+/// Converts a futures 0.1 Sink object to a futures 0.3-compatible version
+#[cfg(feature = "sink")]
+#[cfg_attr(docsrs, doc(cfg(feature = "sink")))]
+#[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,
+}
+
+#[cfg(feature = "sink")]
+impl<S, SinkItem> Unpin for Compat01As03Sink<S, SinkItem> {}
+
+#[cfg(feature = "sink")]
+impl<S, SinkItem> Compat01As03Sink<S, SinkItem> {
+    /// Wraps a futures 0.1 Sink object in a futures 0.3-compatible wrapper.
+    pub fn new(inner: S) -> Self {
+        Self { 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)
+    }
+
+    /// Get a reference to 0.1 Sink object contained within.
+    pub fn get_ref(&self) -> &S {
+        self.inner.get_ref()
+    }
+
+    /// Get a mutable reference to 0.1 Sink contained within.
+    pub fn get_mut(&mut self) -> &mut S {
+        self.inner.get_mut()
+    }
+
+    /// Consume this wrapper to return the underlying 0.1 Sink.
+    pub fn into_inner(self) -> S {
+        self.inner.into_inner()
+    }
+}
+
+#[cfg(feature = "sink")]
+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)? {
+            Async01::Ready(Some(t)) => task03::Poll::Ready(Some(Ok(t))),
+            Async01::Ready(None) => task03::Poll::Ready(None),
+            Async01::NotReady => task03::Poll::Pending,
+        }
+    }
+}
+
+#[cfg(feature = "sink")]
+impl<S, SinkItem> Sink03<SinkItem> for Compat01As03Sink<S, SinkItem>
+where
+    S: Sink01<SinkItem = SinkItem>,
+{
+    type Error = S::SinkError;
+
+    fn start_send(mut self: Pin<&mut Self>, item: SinkItem) -> Result<(), Self::Error> {
+        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::Error>> {
+        match self.buffer.take() {
+            Some(item) => match self.in_notify(cx, |f| f.start_send(item))? {
+                AsyncSink01::Ready => task03::Poll::Ready(Ok(())),
+                AsyncSink01::NotReady(i) => {
+                    self.buffer = Some(i);
+                    task03::Poll::Pending
+                }
+            },
+            None => task03::Poll::Ready(Ok(())),
+        }
+    }
+
+    fn poll_flush(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> task03::Poll<Result<(), Self::Error>> {
+        let item = self.buffer.take();
+        match self.in_notify(cx, |f| match item {
+            Some(i) => match f.start_send(i)? {
+                AsyncSink01::Ready => f.poll_complete().map(|i| (i, None)),
+                AsyncSink01::NotReady(t) => Ok((Async01::NotReady, Some(t))),
+            },
+            None => f.poll_complete().map(|i| (i, None)),
+        })? {
+            (Async01::Ready(_), _) => task03::Poll::Ready(Ok(())),
+            (Async01::NotReady, item) => {
+                self.buffer = item;
+                task03::Poll::Pending
+            }
+        }
+    }
+
+    fn poll_close(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> task03::Poll<Result<(), Self::Error>> {
+        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? {
+            (Async01::Ready(_), _, _) => task03::Poll::Ready(Ok(())),
+            (Async01::NotReady, item, close_started) => {
+                self.buffer = item;
+                self.close_started = close_started;
+                task03::Poll::Pending
+            }
+        }
+    }
+}
+
+struct NotifyWaker(task03::Waker);
+
+#[allow(missing_debug_implementations)] // false positive: this is private type
+#[derive(Clone)]
+struct WakerToHandle<'a>(&'a task03::Waker);
+
+impl From<WakerToHandle<'_>> for NotifyHandle01 {
+    fn from(handle: WakerToHandle<'_>) -> Self {
+        let ptr = Box::new(NotifyWaker(handle.0.clone()));
+
+        unsafe { Self::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")]
+#[cfg_attr(docsrs, doc(cfg(feature = "io-compat")))]
+mod io {
+    use super::*;
+    use futures_io::{AsyncRead as AsyncRead03, AsyncWrite as AsyncWrite03};
+    use std::io::Error;
+    use tokio_io::{AsyncRead as AsyncRead01, AsyncWrite as AsyncWrite01};
+
+    /// Extension trait for tokio-io [`AsyncRead`](tokio_io::AsyncRead)
+    #[cfg_attr(docsrs, doc(cfg(feature = "io-compat")))]
+    pub trait AsyncRead01CompatExt: AsyncRead01 {
+        /// Converts a tokio-io [`AsyncRead`](tokio_io::AsyncRead) into a futures-io 0.3
+        /// [`AsyncRead`](futures_io::AsyncRead).
+        ///
+        /// ```
+        /// # futures::executor::block_on(async {
+        /// use futures::io::AsyncReadExt;
+        /// use futures_util::compat::AsyncRead01CompatExt;
+        ///
+        /// let input = b"Hello World!";
+        /// let reader /* : impl tokio_io::AsyncRead */ = std::io::Cursor::new(input);
+        /// let mut reader /* : impl futures::io::AsyncRead + Unpin */ = reader.compat();
+        ///
+        /// let mut output = Vec::with_capacity(12);
+        /// reader.read_to_end(&mut output).await.unwrap();
+        /// assert_eq!(output, input);
+        /// # });
+        /// ```
+        fn compat(self) -> Compat01As03<Self>
+        where
+            Self: Sized,
+        {
+            Compat01As03::new(self)
+        }
+    }
+    impl<R: AsyncRead01> AsyncRead01CompatExt for R {}
+
+    /// Extension trait for tokio-io [`AsyncWrite`](tokio_io::AsyncWrite)
+    #[cfg_attr(docsrs, doc(cfg(feature = "io-compat")))]
+    pub trait AsyncWrite01CompatExt: AsyncWrite01 {
+        /// Converts a tokio-io [`AsyncWrite`](tokio_io::AsyncWrite) into a futures-io 0.3
+        /// [`AsyncWrite`](futures_io::AsyncWrite).
+        ///
+        /// ```
+        /// # futures::executor::block_on(async {
+        /// use futures::io::AsyncWriteExt;
+        /// use futures_util::compat::AsyncWrite01CompatExt;
+        ///
+        /// let input = b"Hello World!";
+        /// let mut cursor = std::io::Cursor::new(Vec::with_capacity(12));
+        ///
+        /// let mut writer = (&mut cursor).compat();
+        /// writer.write_all(input).await.unwrap();
+        ///
+        /// assert_eq!(cursor.into_inner(), input);
+        /// # });
+        /// ```
+        fn compat(self) -> Compat01As03<Self>
+        where
+            Self: Sized,
+        {
+            Compat01As03::new(self)
+        }
+    }
+    impl<W: AsyncWrite01> AsyncWrite01CompatExt for W {}
+
+    impl<R: AsyncRead01> AsyncRead03 for Compat01As03<R> {
+        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))
+        }
+    }
+}