refactor: reduce dependency on futures-util

src/body/incoming.rs

@@ -2,16 +2,16 @@ use std::fmt;
 #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
 use std::future::Future;
 use std::pin::Pin;
+#[cfg(all(
+    any(feature = "http1", feature = "http2"),
+    any(feature = "client", feature = "server")
+))]
+use std::task::ready;
 use std::task::{Context, Poll};
 
 use bytes::Bytes;
 #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
 use futures_channel::{mpsc, oneshot};
-#[cfg(all(
-    any(feature = "http1", feature = "http2"),
-    any(feature = "client", feature = "server")
-))]
-use futures_util::ready;
 #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
 use futures_util::{stream::FusedStream, Stream}; // for mpsc::Receiver
 #[cfg(all(feature = "http1", any(feature = "client", feature = "server")))]
@@ -368,7 +368,7 @@ impl Sender {
 
     #[cfg(test)]
     async fn ready(&mut self) -> crate::Result<()> {
-        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+        std::future::poll_fn(|cx| self.poll_ready(cx)).await
     }
 
     /// Send data on data channel when it is ready.

src/client/conn/http1.rs

@@ -4,11 +4,10 @@ use std::error::Error as StdError;
 use std::fmt;
 use std::future::Future;
 use std::pin::Pin;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 
 use crate::rt::{Read, Write};
 use bytes::Bytes;
-use futures_util::ready;
 use http::{Request, Response};
 use httparse::ParserConfig;
 
@@ -92,7 +91,7 @@ where
     /// instead run `into_parts`. This is a convenience wrapper over `poll_without_shutdown`.
     pub async fn without_shutdown(self) -> crate::Result<Parts<T>> {
         let mut conn = Some(self);
-        futures_util::future::poll_fn(move |cx| -> Poll<crate::Result<Parts<T>>> {
+        std::future::poll_fn(move |cx| -> Poll<crate::Result<Parts<T>>> {
             ready!(conn.as_mut().unwrap().poll_without_shutdown(cx))?;
             Poll::Ready(Ok(conn.take().unwrap().into_parts()))
         })
@@ -148,7 +147,7 @@ impl<B> SendRequest<B> {
     ///
     /// If the associated connection is closed, this returns an Error.
     pub async fn ready(&mut self) -> crate::Result<()> {
-        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+        std::future::poll_fn(|cx| self.poll_ready(cx)).await
     }
 
     /// Checks if the connection is currently ready to send a request.

src/client/conn/http2.rs

@@ -6,11 +6,10 @@ use std::future::Future;
 use std::marker::PhantomData;
 use std::pin::Pin;
 use std::sync::Arc;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 use std::time::Duration;
 
 use crate::rt::{Read, Write};
-use futures_util::ready;
 use http::{Request, Response};
 
 use super::super::dispatch::{self, TrySendError};
@@ -99,7 +98,7 @@ impl<B> SendRequest<B> {
     ///
     /// If the associated connection is closed, this returns an Error.
     pub async fn ready(&mut self) -> crate::Result<()> {
-        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+        std::future::poll_fn(|cx| self.poll_ready(cx)).await
     }
 
     /// Checks if the connection is currently ready to send a request.

src/proto/h1/conn.rs

@@ -4,13 +4,12 @@ use std::future::Future;
 use std::io;
 use std::marker::{PhantomData, Unpin};
 use std::pin::Pin;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 #[cfg(feature = "server")]
 use std::time::{Duration, Instant};
 
 use crate::rt::{Read, Write};
 use bytes::{Buf, Bytes};
-use futures_util::ready;
 use http::header::{HeaderValue, CONNECTION, TE};
 use http::{HeaderMap, Method, Version};
 use http_body::Frame;
@@ -1174,7 +1173,7 @@ mod tests {
             .unwrap();
 
         b.iter(|| {
-            rt.block_on(futures_util::future::poll_fn(|cx| {
+            rt.block_on(std::future::poll_fn(|cx| {
                 match conn.poll_read_head(cx) {
                     Poll::Ready(Some(Ok(x))) => {
                         ::test::black_box(&x);

src/proto/h1/decode.rs

@@ -1,10 +1,9 @@
 use std::error::Error as StdError;
 use std::fmt;
 use std::io;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 
 use bytes::{BufMut, Bytes, BytesMut};
-use futures_util::ready;
 use http::{HeaderMap, HeaderName, HeaderValue};
 use http_body::Frame;
 
@@ -244,7 +243,7 @@ impl Decoder {
 
     #[cfg(test)]
     async fn decode_fut<R: MemRead>(&mut self, body: &mut R) -> Result<Frame<Bytes>, io::Error> {
-        futures_util::future::poll_fn(move |cx| self.decode(cx, body)).await
+        std::future::poll_fn(move |cx| self.decode(cx, body)).await
     }
 }
 
@@ -746,7 +745,7 @@ mod tests {
             let mut ext_cnt = 0;
             let mut trailers_cnt = 0;
             loop {
-                let result = futures_util::future::poll_fn(|cx| {
+                let result = std::future::poll_fn(|cx| {
                     state.step(
                         cx,
                         rdr,
@@ -776,7 +775,7 @@ mod tests {
             let mut ext_cnt = 0;
             let mut trailers_cnt = 0;
             loop {
-                let result = futures_util::future::poll_fn(|cx| {
+                let result = std::future::poll_fn(|cx| {
                     state.step(
                         cx,
                         rdr,

src/proto/h1/dispatch.rs

@@ -3,12 +3,11 @@ use std::{
     future::Future,
     marker::Unpin,
     pin::Pin,
-    task::{Context, Poll},
+    task::{ready, Context, Poll},
 };
 
 use crate::rt::{Read, Write};
 use bytes::{Buf, Bytes};
-use futures_util::ready;
 use http::Request;
 
 use super::{Http1Transaction, Wants};

src/proto/h1/io.rs

@@ -2,11 +2,10 @@ use std::cmp;
 use std::fmt;
 use std::io::{self, IoSlice};
 use std::pin::Pin;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 
 use crate::rt::{Read, ReadBuf, Write};
 use bytes::{Buf, BufMut, Bytes, BytesMut};
-use futures_util::ready;
 
 use super::{Http1Transaction, ParseContext, ParsedMessage};
 use crate::common::buf::BufList;
@@ -325,7 +324,7 @@ where
 
     #[cfg(test)]
     fn flush(&mut self) -> impl std::future::Future<Output = io::Result<()>> + '_ {
-        futures_util::future::poll_fn(move |cx| self.poll_flush(cx))
+        std::future::poll_fn(move |cx| self.poll_flush(cx))
     }
 }
 
@@ -668,7 +667,7 @@ mod tests {
         // // First, let's just check that the Mock would normally return an
         // // error on an unexpected write, even if the buffer is empty...
         // let mut mock = Mock::new().build();
-        // futures_util::future::poll_fn(|cx| {
+        // std::future::poll_fn(|cx| {
         //     Pin::new(&mut mock).poll_write_buf(cx, &mut Cursor::new(&[]))
         // })
         // .await
@@ -700,7 +699,7 @@ mod tests {
 
         // We expect a `parse` to be not ready, and so can't await it directly.
         // Rather, this `poll_fn` will wrap the `Poll` result.
-        futures_util::future::poll_fn(|cx| {
+        std::future::poll_fn(|cx| {
             let parse_ctx = ParseContext {
                 cached_headers: &mut None,
                 req_method: &mut None,

src/proto/h2/client.rs

@@ -3,7 +3,7 @@ use std::{
     future::Future,
     marker::PhantomData,
     pin::Pin,
-    task::{Context, Poll},
+    task::{ready, Context, Poll},
     time::Duration,
 };
 
@@ -12,7 +12,6 @@ use bytes::Bytes;
 use futures_channel::mpsc::{Receiver, Sender};
 use futures_channel::{mpsc, oneshot};
 use futures_util::future::{Either, FusedFuture, FutureExt as _};
-use futures_util::ready;
 use futures_util::stream::{StreamExt as _, StreamFuture};
 use h2::client::{Builder, Connection, SendRequest};
 use h2::SendStream;

src/proto/h2/mod.rs

@@ -3,10 +3,9 @@ use std::future::Future;
 use std::io::{Cursor, IoSlice};
 use std::mem;
 use std::pin::Pin;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 
 use bytes::{Buf, Bytes};
-use futures_util::ready;
 use h2::{Reason, RecvStream, SendStream};
 use http::header::{HeaderName, CONNECTION, TE, TRANSFER_ENCODING, UPGRADE};
 use http::HeaderMap;

src/proto/h2/server.rs

@@ -1,11 +1,10 @@
 use std::error::Error as StdError;
 use std::future::Future;
 use std::pin::Pin;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 use std::time::Duration;
 
 use bytes::Bytes;
-use futures_util::ready;
 use h2::server::{Connection, Handshake, SendResponse};
 use h2::{Reason, RecvStream};
 use http::{Method, Request};

src/server/conn/http1.rs

@@ -5,13 +5,12 @@ use std::fmt;
 use std::future::Future;
 use std::pin::Pin;
 use std::sync::Arc;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 use std::time::Duration;
 
 use crate::rt::{Read, Write};
 use crate::upgrade::Upgraded;
 use bytes::Bytes;
-use futures_util::ready;
 
 use crate::body::{Body, Incoming as IncomingBody};
 use crate::proto;
@@ -179,7 +178,7 @@ where
     /// This errors if the underlying connection protocol is not HTTP/1.
     pub fn without_shutdown(self) -> impl Future<Output = crate::Result<Parts<I, S>>> {
         let mut zelf = Some(self);
-        futures_util::future::poll_fn(move |cx| {
+        std::future::poll_fn(move |cx| {
             ready!(zelf.as_mut().unwrap().conn.poll_without_shutdown(cx))?;
             Poll::Ready(Ok(zelf.take().unwrap().into_parts()))
         })

src/server/conn/http2.rs

@@ -5,11 +5,10 @@ use std::fmt;
 use std::future::Future;
 use std::pin::Pin;
 use std::sync::Arc;
-use std::task::{Context, Poll};
+use std::task::{ready, Context, Poll};
 use std::time::Duration;
 
 use crate::rt::{Read, Write};
-use futures_util::ready;
 use pin_project_lite::pin_project;
 
 use crate::body::{Body, Incoming as IncomingBody};

tests/client.rs

@@ -1486,6 +1486,7 @@ test! {
 
 mod conn {
     use std::error::Error;
+    use std::future::poll_fn;
     use std::io::{self, Read, Write};
     use std::net::{SocketAddr, TcpListener};
     use std::pin::Pin;
@@ -1495,7 +1496,7 @@ mod conn {
 
     use bytes::{Buf, Bytes};
     use futures_channel::{mpsc, oneshot};
-    use futures_util::future::{self, poll_fn, FutureExt, TryFutureExt};
+    use futures_util::future::{self, FutureExt, TryFutureExt};
     use http_body_util::{BodyExt, Empty, Full, StreamBody};
     use hyper::rt::Timer;
     use tokio::io::{AsyncReadExt as _, AsyncWriteExt as _};