Prune futures-* dependencies

Cargo.toml

@@ -44,9 +44,12 @@ members = [
 ]
 
 [dependencies]
-futures-preview = "=0.3.0-alpha.18"
-tokio-io = { version = "=0.2.0-alpha.4", features = ["util"] }
+futures-core-preview = "=0.3.0-alpha.18"
+futures-sink-preview = "=0.3.0-alpha.18"
+futures-util-preview = "=0.3.0-alpha.18"
 tokio-codec = "=0.2.0-alpha.4"
+tokio-io = { version = "=0.2.0-alpha.4", features = ["util"] }
+tokio-sync = "=0.2.0-alpha.4"
 bytes = "0.4.7"
 http = "0.1.8"
 log = "0.4.1"

src/client.rs

@@ -141,7 +141,6 @@ use crate::proto;
 use crate::{PingPong, RecvStream, ReleaseCapacity, SendStream};
 
 use bytes::{Bytes, IntoBuf};
-use futures::{ready, FutureExt};
 use http::{uri, HeaderMap, Method, Request, Response, Version};
 use std::fmt;
 use std::future::Future;
@@ -1282,7 +1281,7 @@ impl ResponseFuture {
 impl PushPromises {
     /// Get the next `PushPromise`.
     pub async fn push_promise(&mut self) -> Option<Result<PushPromise, crate::Error>> {
-        futures::future::poll_fn(move |cx| self.poll_push_promise(cx)).await
+        futures_util::future::poll_fn(move |cx| self.poll_push_promise(cx)).await
     }
 
     #[doc(hidden)]
@@ -1308,7 +1307,7 @@ impl PushPromises {
 }
 
 #[cfg(feature = "stream")]
-impl futures::Stream for PushPromises {
+impl futures_core::Stream for PushPromises {
     type Item = Result<PushPromise, crate::Error>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
@@ -1342,7 +1341,7 @@ impl Future for PushedResponseFuture {
     type Output = Result<Response<RecvStream>, crate::Error>;
 
     fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
-        self.inner.poll_unpin(cx)
+        Pin::new(&mut self.inner).poll(cx)
     }
 }
 

src/codec/framed_read.rs

@@ -6,7 +6,7 @@ use crate::frame::{
 
 use crate::hpack;
 
-use futures::{ready, Stream};
+use futures_core::Stream;
 
 use bytes::BytesMut;
 

src/codec/framed_write.rs

@@ -4,7 +4,6 @@ use crate::frame::{self, Frame, FrameSize};
 use crate::hpack;
 
 use bytes::{Buf, BufMut, BytesMut};
-use futures::ready;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use tokio_io::{AsyncRead, AsyncWrite};

src/codec/mod.rs

@@ -9,9 +9,9 @@ use self::framed_write::FramedWrite;
 
 use crate::frame::{self, Data, Frame};
 
-use futures::*;
-
 use bytes::Buf;
+use futures_core::Stream;
+use futures_sink::Sink;
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use tokio_codec::length_delimited;

src/lib.rs

@@ -91,6 +91,15 @@ macro_rules! proto_err {
     };
 }
 
+macro_rules! ready {
+    ($e:expr) => {
+        match $e {
+            ::std::task::Poll::Ready(r) => r,
+            ::std::task::Poll::Pending => return ::std::task::Poll::Pending,
+        }
+    };
+}
+
 #[cfg_attr(feature = "unstable", allow(missing_docs))]
 mod codec;
 mod error;

src/proto/connection.rs

@@ -6,7 +6,7 @@ use crate::frame::DEFAULT_INITIAL_WINDOW_SIZE;
 use crate::proto::*;
 
 use bytes::{Bytes, IntoBuf};
-use futures::{ready, Stream};
+use futures_core::Stream;
 use std::io;
 use std::marker::PhantomData;
 use std::pin::Pin;

src/proto/ping_pong.rs

@@ -3,12 +3,12 @@ use crate::frame::Ping;
 use crate::proto::{self, PingPayload};
 
 use bytes::Buf;
-use futures::task::AtomicWaker;
 use std::io;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::Arc;
 use std::task::{Context, Poll};
 use tokio_io::AsyncWrite;
+use tokio_sync::AtomicWaker;
 
 /// Acknowledges ping requests from the remote.
 #[derive(Debug)]
@@ -190,7 +190,7 @@ impl PingPong {
                     .state
                     .store(USER_STATE_PENDING_PONG, Ordering::Release);
             } else {
-                users.0.ping_task.register(cx.waker());
+                users.0.ping_task.register_by_ref(cx.waker());
             }
         }
 
@@ -233,7 +233,7 @@ impl UserPings {
     pub(crate) fn poll_pong(&self, cx: &mut Context) -> Poll<Result<(), proto::Error>> {
         // Must register before checking state, in case state were to change
         // before we could register, and then the ping would just be lost.
-        self.0.pong_task.register(cx.waker());
+        self.0.pong_task.register_by_ref(cx.waker());
         let prev = self.0.state.compare_and_swap(
             USER_STATE_RECEIVED_PONG, // current
             USER_STATE_EMPTY,         // new

src/proto/streams/prioritize.rs

@@ -7,7 +7,6 @@ use crate::codec::UserError;
 use crate::codec::UserError::*;
 
 use bytes::buf::Take;
-use futures::ready;
 use std::io;
 use std::task::{Context, Poll, Waker};
 use std::{cmp, fmt, mem};

src/proto/streams/recv.rs

@@ -4,7 +4,6 @@ use crate::frame::{Reason, DEFAULT_INITIAL_WINDOW_SIZE};
 use crate::{frame, proto};
 use std::task::Context;
 
-use futures::ready;
 use http::{HeaderMap, Method, Request, Response};
 
 use std::io;

src/proto/streams/streams.rs

@@ -7,7 +7,6 @@ use crate::proto::{peer, Open, Peer, WindowSize};
 use crate::{client, proto, server};
 
 use bytes::{Buf, Bytes};
-use futures::ready;
 use http::{HeaderMap, Request, Response};
 use std::task::{Context, Poll, Waker};
 use tokio_io::AsyncWrite;

src/server.rs

@@ -121,7 +121,6 @@ use crate::proto::{self, Config, Prioritized};
 use crate::{PingPong, RecvStream, ReleaseCapacity, SendStream};
 
 use bytes::{Buf, Bytes, IntoBuf};
-use futures::ready;
 use http::{HeaderMap, Request, Response};
 use std::future::Future;
 use std::pin::Pin;
@@ -363,7 +362,7 @@ where
     pub async fn accept(
         &mut self,
     ) -> Option<Result<(Request<RecvStream>, SendResponse<B>), crate::Error>> {
-        futures::future::poll_fn(move |cx| self.poll_accept(cx)).await
+        futures_util::future::poll_fn(move |cx| self.poll_accept(cx)).await
     }
 
     #[doc(hidden)]
@@ -479,7 +478,7 @@ where
 }
 
 #[cfg(feature = "stream")]
-impl<T, B> futures::Stream for Connection<T, B>
+impl<T, B> futures_core::Stream for Connection<T, B>
 where
     T: AsyncRead + AsyncWrite + Unpin,
     B: IntoBuf + Unpin,

src/share.rs

@@ -6,7 +6,6 @@ use bytes::{Bytes, IntoBuf};
 use http::HeaderMap;
 
 use crate::PollExt;
-use futures::ready;
 use std::fmt;
 #[cfg(feature = "stream")]
 use std::pin::Pin;
@@ -272,9 +271,6 @@ impl<B: IntoBuf> SendStream<B> {
     /// # async fn doc(mut send_stream: SendStream<&'static [u8]>) {
     /// send_stream.reserve_capacity(100);
     ///
-    /// let capacity = futures::future::poll_fn(|cx| send_stream.poll_capacity(cx)).await;
-    /// // capacity == 5;
-    ///
     /// send_stream.send_data(b"hello", false).unwrap();
     /// // At this point, the total amount of requested capacity is 95 bytes.
     ///
@@ -417,12 +413,12 @@ impl RecvStream {
 
     /// Get the next data frame.
     pub async fn data(&mut self) -> Option<Result<Bytes, crate::Error>> {
-        futures::future::poll_fn(move |cx| self.poll_data(cx)).await
+        futures_util::future::poll_fn(move |cx| self.poll_data(cx)).await
     }
 
     /// Get optional trailers for this stream.
     pub async fn trailers(&mut self) -> Result<Option<HeaderMap>, crate::Error> {
-        futures::future::poll_fn(move |cx| self.poll_trailers(cx)).await
+        futures_util::future::poll_fn(move |cx| self.poll_trailers(cx)).await
     }
 
     #[doc(hidden)]
@@ -453,7 +449,7 @@ impl RecvStream {
 }
 
 #[cfg(feature = "stream")]
-impl futures::Stream for RecvStream {
+impl futures_core::Stream for RecvStream {
     type Item = Result<Bytes, crate::Error>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
@@ -538,21 +534,13 @@ impl PingPong {
         PingPong { inner }
     }
 
-    /// Send a `PING` frame to the peer.
-    ///
-    /// Only one ping can be pending at a time, so trying to send while
-    /// a pong has not be received means this will return a user error.
-    ///
-    /// # Example
-    ///
-    /// ```
-    /// # fn doc(mut ping_pong: h2::PingPong) {
-    /// // let mut ping_pong = ...
-    /// ping_pong
-    ///     .send_ping(h2::Ping::opaque())
-    ///     .unwrap();
-    /// # }
-    /// ```
+    /// Send a PING frame and wait for the peer to send the pong.
+    pub async fn ping(&mut self, ping: Ping) -> Result<Pong, crate::Error> {
+        self.send_ping(ping)?;
+        futures_util::future::poll_fn(|cx| self.poll_pong(cx)).await
+    }
+
+    #[doc(hidden)]
     pub fn send_ping(&mut self, ping: Ping) -> Result<(), crate::Error> {
         // Passing a `Ping` here is just to be forwards-compatible with
         // eventually allowing choosing a ping payload. For now, we can
@@ -565,28 +553,7 @@ impl PingPong {
         })
     }
 
-    /// Polls for the acknowledgement of a previously [sent][] `PING` frame.
-    ///
-    /// # Example
-    ///
-    /// ```
-    /// # async fn doc(mut ping_pong: h2::PingPong) {
-    /// // let mut ping_pong = ...
-    ///
-    /// // First, send a PING.
-    /// ping_pong
-    ///     .send_ping(h2::Ping::opaque())
-    ///     .unwrap();
-    ///
-    /// // And then wait for the PONG.
-    /// futures::future::poll_fn(move |cx| {
-    ///     ping_pong.poll_pong(cx)
-    /// }).await.unwrap();
-    /// # }
-    /// # fn main() {}
-    /// ```
-    ///
-    /// [sent]: struct.PingPong.html#method.send_ping
+    #[doc(hidden)]
     pub fn poll_pong(&mut self, cx: &mut Context) -> Poll<Result<Pong, crate::Error>> {
         ready!(self.inner.poll_pong(cx))?;
         Poll::Ready(Ok(Pong { _p: () }))