refactor(common): remove common re-export (#3346)

src/body/incoming.rs

@@ -1,4 +1,7 @@
 use std::fmt;
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
 
 use bytes::Bytes;
 use futures_channel::mpsc;
@@ -8,8 +11,7 @@ use http::HeaderMap;
 use http_body::{Body, Frame, SizeHint};
 
 use super::DecodedLength;
-use crate::common::Future;
-use crate::common::{task, watch, Pin, Poll};
+use crate::common::watch;
 #[cfg(all(feature = "http2", any(feature = "client", feature = "server")))]
 use crate::proto::h2::ping;
 
@@ -157,7 +159,7 @@ impl Body for Incoming {
 
     fn poll_frame(
         mut self: Pin<&mut Self>,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
     ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
         match self.kind {
             Kind::Empty => Poll::Ready(None),
@@ -287,15 +289,15 @@ impl fmt::Debug for Incoming {
 
 impl Sender {
     /// Check to see if this `Sender` can send more data.
-    pub(crate) fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    pub(crate) fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         // Check if the receiver end has tried polling for the body yet
         ready!(self.poll_want(cx)?);
         self.data_tx
             .poll_ready(cx)
             .map_err(|_| crate::Error::new_closed())
     }
 
-    fn poll_want(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    fn poll_want(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         match self.want_rx.load(cx) {
             WANT_READY => Poll::Ready(Ok(())),
             WANT_PENDING => Poll::Pending,

src/client/conn/http1.rs

@@ -2,6 +2,9 @@
 
 use std::error::Error as StdError;
 use std::fmt;
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
 
 use crate::rt::{Read, Write};
 use bytes::Bytes;
@@ -10,7 +13,6 @@ use httparse::ParserConfig;
 
 use super::super::dispatch;
 use crate::body::{Body, Incoming as IncomingBody};
-use crate::common::{task, Future, Pin, Poll};
 use crate::proto;
 use crate::upgrade::Upgraded;
 
@@ -84,7 +86,7 @@ where
     /// Use [`poll_fn`](https://docs.rs/futures/0.1.25/futures/future/fn.poll_fn.html)
     /// and [`try_ready!`](https://docs.rs/futures/0.1.25/futures/macro.try_ready.html)
     /// to work with this function; or use the `without_shutdown` wrapper.
-    pub fn poll_without_shutdown(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    pub fn poll_without_shutdown(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         self.inner
             .as_mut()
             .expect("already upgraded")
@@ -128,7 +130,7 @@ impl<B> SendRequest<B> {
     /// Polls to determine whether this sender can be used yet for a request.
     ///
     /// If the associated connection is closed, this returns an Error.
-    pub fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    pub fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         self.dispatch.poll_ready(cx)
     }
 
@@ -254,7 +256,7 @@ where
 {
     type Output = crate::Result<()>;
 
-    fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         match ready!(Pin::new(self.inner.as_mut().unwrap()).poll(cx))? {
             proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
             proto::Dispatched::Upgrade(pending) => match self.inner.take() {

src/client/conn/http2.rs

@@ -2,8 +2,11 @@
 
 use std::error::Error;
 use std::fmt;
+use std::future::Future;
 use std::marker::PhantomData;
+use std::pin::Pin;
 use std::sync::Arc;
+use std::task::{Context, Poll};
 use std::time::Duration;
 
 use crate::rt::{Read, Write};
@@ -12,7 +15,6 @@ use http::{Request, Response};
 use super::super::dispatch;
 use crate::body::{Body, Incoming as IncomingBody};
 use crate::common::time::Time;
-use crate::common::{task, Future, Pin, Poll};
 use crate::proto;
 use crate::rt::bounds::ExecutorClient;
 use crate::rt::Timer;
@@ -79,7 +81,7 @@ impl<B> SendRequest<B> {
     /// Polls to determine whether this sender can be used yet for a request.
     ///
     /// If the associated connection is closed, this returns an Error.
-    pub fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    pub fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         if self.is_closed() {
             Poll::Ready(Err(crate::Error::new_closed()))
         } else {
@@ -236,7 +238,7 @@ where
 {
     type Output = crate::Result<()>;
 
-    fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         match ready!(Pin::new(&mut self.inner.1).poll(cx))? {
             proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
             #[cfg(feature = "http1")]

src/client/dispatch.rs

@@ -1,5 +1,6 @@
+use std::task::{Context, Poll};
 #[cfg(feature = "http2")]
-use std::future::Future;
+use std::{future::Future, pin::Pin};
 
 #[cfg(feature = "http2")]
 use http::{Request, Response};
@@ -9,9 +10,8 @@ use http_body::Body;
 use pin_project_lite::pin_project;
 use tokio::sync::{mpsc, oneshot};
 
-use crate::common::{task, Poll};
 #[cfg(feature = "http2")]
-use crate::{body::Incoming, common::Pin, proto::h2::client::ResponseFutMap};
+use crate::{body::Incoming, proto::h2::client::ResponseFutMap};
 
 #[cfg(test)]
 pub(crate) type RetryPromise<T, U> = oneshot::Receiver<Result<U, (crate::Error, Option<T>)>>;
@@ -62,7 +62,7 @@ pub(crate) struct UnboundedSender<T, U> {
 
 impl<T, U> Sender<T, U> {
     #[cfg(feature = "http1")]
-    pub(crate) fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    pub(crate) fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         self.giver
             .poll_want(cx)
             .map_err(|_| crate::Error::new_closed())
@@ -169,10 +169,7 @@ pub(crate) struct Receiver<T, U> {
 }
 
 impl<T, U> Receiver<T, U> {
-    pub(crate) fn poll_recv(
-        &mut self,
-        cx: &mut task::Context<'_>,
-    ) -> Poll<Option<(T, Callback<T, U>)>> {
+    pub(crate) fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<(T, Callback<T, U>)>> {
         match self.inner.poll_recv(cx) {
             Poll::Ready(item) => {
                 Poll::Ready(item.map(|mut env| env.0.take().expect("envelope not dropped")))
@@ -261,7 +258,7 @@ impl<T, U> Callback<T, U> {
         }
     }
 
-    pub(crate) fn poll_canceled(&mut self, cx: &mut task::Context<'_>) -> Poll<()> {
+    pub(crate) fn poll_canceled(&mut self, cx: &mut Context<'_>) -> Poll<()> {
         match *self {
             Callback::Retry(Some(ref mut tx)) => tx.poll_closed(cx),
             Callback::NoRetry(Some(ref mut tx)) => tx.poll_closed(cx),
@@ -302,7 +299,7 @@ where
 {
     type Output = ();
 
-    fn poll(self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
         let mut this = self.project();
 
         let mut call_back = this.call_back.take().expect("polled after complete");
@@ -319,7 +316,7 @@ where
                     Poll::Pending => {
                         // Move call_back back to struct before return
                         this.call_back.set(Some(call_back));
-                        return std::task::Poll::Pending;
+                        return Poll::Pending;
                     }
                 };
                 trace!("send_when canceled");

src/common/io/rewind.rs

@@ -1,9 +1,10 @@
 use std::marker::Unpin;
+use std::pin::Pin;
+use std::task::{Context, Poll};
 use std::{cmp, io};
 
 use bytes::{Buf, Bytes};
 
-use crate::common::{task, Pin, Poll};
 use crate::rt::{Read, ReadBufCursor, Write};
 
 /// Combine a buffer with an IO, rewinding reads to use the buffer.
@@ -50,7 +51,7 @@ where
 {
     fn poll_read(
         mut self: Pin<&mut Self>,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
         mut buf: ReadBufCursor<'_>,
     ) -> Poll<io::Result<()>> {
         if let Some(mut prefix) = self.pre.take() {
@@ -78,25 +79,25 @@ where
 {
     fn poll_write(
         mut self: Pin<&mut Self>,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
         buf: &[u8],
     ) -> Poll<io::Result<usize>> {
         Pin::new(&mut self.inner).poll_write(cx, buf)
     }
 
     fn poll_write_vectored(
         mut self: Pin<&mut Self>,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
         bufs: &[io::IoSlice<'_>],
     ) -> Poll<io::Result<usize>> {
         Pin::new(&mut self.inner).poll_write_vectored(cx, bufs)
     }
 
-    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
+    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         Pin::new(&mut self.inner).poll_flush(cx)
     }
 
-    fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
+    fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         Pin::new(&mut self.inner).poll_shutdown(cx)
     }
 

src/common/mod.rs

@@ -21,8 +21,3 @@ pub(crate) mod task;
 ))]
 pub(crate) mod time;
 pub(crate) mod watch;
-
-pub(crate) use self::task::Poll;
-
-// group up types normally needed for `Future`
-pub(crate) use std::{future::Future, pin::Pin};

src/common/task.rs

@@ -1,4 +1,5 @@
-pub(crate) use std::task::{Context, Poll};
+#[cfg(all(any(feature = "client", feature = "server"), feature = "http1"))]
+use std::task::{Context, Poll};
 
 /// A function to help "yield" a future, such that it is re-scheduled immediately.
 ///

src/proto/h1/conn.rs

@@ -1,6 +1,8 @@
 use std::fmt;
 use std::io;
 use std::marker::{PhantomData, Unpin};
+use std::pin::Pin;
+use std::task::{Context, Poll};
 #[cfg(feature = "server")]
 use std::time::Duration;
 
@@ -15,7 +17,6 @@ use super::{Decoder, Encode, EncodedBuf, Encoder, Http1Transaction, ParseContext
 use crate::body::DecodedLength;
 #[cfg(feature = "server")]
 use crate::common::time::Time;
-use crate::common::{task, Pin, Poll};
 use crate::headers::connection_keep_alive;
 use crate::proto::{BodyLength, MessageHead};
 #[cfg(feature = "server")]
@@ -193,7 +194,7 @@ where
 
     pub(super) fn poll_read_head(
         &mut self,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
     ) -> Poll<Option<crate::Result<(MessageHead<T::Incoming>, DecodedLength, Wants)>>> {
         debug_assert!(self.can_read_head());
         trace!("Conn::read_head");
@@ -294,7 +295,7 @@ where
 
     pub(crate) fn poll_read_body(
         &mut self,
-        cx: &mut task::Context<'_>,
+        cx: &mut Context<'_>,
     ) -> Poll<Option<io::Result<Bytes>>> {
         debug_assert!(self.can_read_body());
 
@@ -355,10 +356,7 @@ where
         ret
     }
 
-    pub(crate) fn poll_read_keep_alive(
-        &mut self,
-        cx: &mut task::Context<'_>,
-    ) -> Poll<crate::Result<()>> {
+    pub(crate) fn poll_read_keep_alive(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         debug_assert!(!self.can_read_head() && !self.can_read_body());
 
         if self.is_read_closed() {
@@ -381,7 +379,7 @@ where
     //
     // This should only be called for Clients wanting to enter the idle
     // state.
-    fn require_empty_read(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    fn require_empty_read(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         debug_assert!(!self.can_read_head() && !self.can_read_body() && !self.is_read_closed());
         debug_assert!(!self.is_mid_message());
         debug_assert!(T::is_client());
@@ -414,7 +412,7 @@ where
         Poll::Ready(Err(crate::Error::new_unexpected_message()))
     }
 
-    fn mid_message_detect_eof(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
+    fn mid_message_detect_eof(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
         debug_assert!(!self.can_read_head() && !self.can_read_body() && !self.is_read_closed());
         debug_assert!(self.is_mid_message());
 
@@ -433,7 +431,7 @@ where
         }
     }
 
-    fn force_io_read(&mut self, cx: &mut task::Context<'_>) -> Poll<io::Result<usize>> {
+    fn force_io_read(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<usize>> {
         debug_assert!(!self.state.is_read_closed());
 
         let result = ready!(self.io.poll_read_from_io(cx));
@@ -444,7 +442,7 @@ where
         }))
     }
 
-    fn maybe_notify(&mut self, cx: &mut task::Context<'_>) {
+    fn maybe_notify(&mut self, cx: &mut Context<'_>) {
         // its possible that we returned NotReady from poll() without having
         // exhausted the underlying Io. We would have done this when we
         // determined we couldn't keep reading until we knew how writing
@@ -491,7 +489,7 @@ where
         }
     }
 
-    fn try_keep_alive(&mut self, cx: &mut task::Context<'_>) {
+    fn try_keep_alive(&mut self, cx: &mut Context<'_>) {
         self.state.try_keep_alive::<T>();
         self.maybe_notify(cx);
     }
@@ -716,14 +714,14 @@ where
         Err(err)
     }
 
-    pub(crate) fn poll_flush(&mut self, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
+    pub(crate) fn poll_flush(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         ready!(Pin::new(&mut self.io).poll_flush(cx))?;
         self.try_keep_alive(cx);
         trace!("flushed({}): {:?}", T::LOG, self.state);
         Poll::Ready(Ok(()))
     }
 
-    pub(crate) fn poll_shutdown(&mut self, cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
+    pub(crate) fn poll_shutdown(&mut self, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
         match ready!(Pin::new(self.io.io_mut()).poll_shutdown(cx)) {
             Ok(()) => {
                 trace!("shut down IO complete");
@@ -737,7 +735,7 @@ where
     }
 
     /// If the read side can be cheaply drained, do so. Otherwise, close.
-    pub(super) fn poll_drain_or_close_read(&mut self, cx: &mut task::Context<'_>) {
+    pub(super) fn poll_drain_or_close_read(&mut self, cx: &mut Context<'_>) {
         if let Reading::Continue(ref decoder) = self.state.reading {
             // skip sending the 100-continue
             // just move forward to a read, in case a tiny body was included