migrate client to std::future

actix-http/src/client/connection.rs

@@ -1,9 +1,10 @@
+use std::pin::Pin;
+use std::task::{Context, Poll};
 use std::{fmt, io, time};
 
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use bytes::{Buf, Bytes};
-use futures::future::{err, Either, Future, FutureResult};
-use futures::Poll;
+use futures::future::{err, Either, Future, FutureExt, LocalBoxFuture, Ready};
 use h2::client::SendRequest;
 
 use crate::body::MessageBody;
@@ -22,7 +23,7 @@ pub(crate) enum ConnectionType<Io> {
 
 pub trait Connection {
     type Io: AsyncRead + AsyncWrite;
-    type Future: Future<Item = (ResponseHead, Payload), Error = SendRequestError>;
+    type Future: Future<Output = Result<(ResponseHead, Payload), SendRequestError>>;
 
     fn protocol(&self) -> Protocol;
 
@@ -34,15 +35,16 @@ pub trait Connection {
     ) -> Self::Future;
 
     type TunnelFuture: Future<
-        Item = (ResponseHead, Framed<Self::Io, ClientCodec>),
-        Error = SendRequestError,
+        Output = Result<(ResponseHead, Framed<Self::Io, ClientCodec>), SendRequestError>,
     >;
 
     /// Send request, returns Response and Framed
     fn open_tunnel<H: Into<RequestHeadType>>(self, head: H) -> Self::TunnelFuture;
 }
 
-pub(crate) trait ConnectionLifetime: AsyncRead + AsyncWrite + 'static {
+pub(crate) trait ConnectionLifetime:
+    AsyncRead + AsyncWrite + Unpin + 'static
+{
     /// Close connection
     fn close(&mut self);
 
@@ -91,11 +93,11 @@ impl<T: AsyncRead + AsyncWrite> IoConnection<T> {
 
 impl<T> Connection for IoConnection<T>
 where
-    T: AsyncRead + AsyncWrite + 'static,
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     type Io = T;
     type Future =
-        Box<dyn Future<Item = (ResponseHead, Payload), Error = SendRequestError>>;
+        LocalBoxFuture<'static, Result<(ResponseHead, Payload), SendRequestError>>;
 
     fn protocol(&self) -> Protocol {
         match self.io {
@@ -111,38 +113,30 @@ where
         body: B,
     ) -> Self::Future {
         match self.io.take().unwrap() {
-            ConnectionType::H1(io) => Box::new(h1proto::send_request(
-                io,
-                head.into(),
-                body,
-                self.created,
-                self.pool,
-            )),
-            ConnectionType::H2(io) => Box::new(h2proto::send_request(
-                io,
-                head.into(),
-                body,
-                self.created,
-                self.pool,
-            )),
+            ConnectionType::H1(io) => {
+                h1proto::send_request(io, head.into(), body, self.created, self.pool)
+                    .boxed_local()
+            }
+            ConnectionType::H2(io) => {
+                h2proto::send_request(io, head.into(), body, self.created, self.pool)
+                    .boxed_local()
+            }
         }
     }
 
     type TunnelFuture = Either<
-        Box<
-            dyn Future<
-                Item = (ResponseHead, Framed<Self::Io, ClientCodec>),
-                Error = SendRequestError,
-            >,
+        LocalBoxFuture<
+            'static,
+            Result<(ResponseHead, Framed<Self::Io, ClientCodec>), SendRequestError>,
         >,
-        FutureResult<(ResponseHead, Framed<Self::Io, ClientCodec>), SendRequestError>,
+        Ready<Result<(ResponseHead, Framed<Self::Io, ClientCodec>), SendRequestError>>,
     >;
 
     /// Send request, returns Response and Framed
     fn open_tunnel<H: Into<RequestHeadType>>(mut self, head: H) -> Self::TunnelFuture {
         match self.io.take().unwrap() {
             ConnectionType::H1(io) => {
-                Either::A(Box::new(h1proto::open_tunnel(io, head.into())))
+                Either::Left(h1proto::open_tunnel(io, head.into()).boxed_local())
             }
             ConnectionType::H2(io) => {
                 if let Some(mut pool) = self.pool.take() {
@@ -152,7 +146,7 @@ where
                         None,
                     ));
                 }
-                Either::B(err(SendRequestError::TunnelNotSupported))
+                Either::Right(err(SendRequestError::TunnelNotSupported))
             }
         }
     }
@@ -166,12 +160,12 @@ pub(crate) enum EitherConnection<A, B> {
 
 impl<A, B> Connection for EitherConnection<A, B>
 where
-    A: AsyncRead + AsyncWrite + 'static,
-    B: AsyncRead + AsyncWrite + 'static,
+    A: AsyncRead + AsyncWrite + Unpin + 'static,
+    B: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     type Io = EitherIo<A, B>;
     type Future =
-        Box<dyn Future<Item = (ResponseHead, Payload), Error = SendRequestError>>;
+        LocalBoxFuture<'static, Result<(ResponseHead, Payload), SendRequestError>>;
 
     fn protocol(&self) -> Protocol {
         match self {
@@ -191,24 +185,22 @@ where
         }
     }
 
-    type TunnelFuture = Box<
-        dyn Future<
-            Item = (ResponseHead, Framed<Self::Io, ClientCodec>),
-            Error = SendRequestError,
-        >,
+    type TunnelFuture = LocalBoxFuture<
+        'static,
+        Result<(ResponseHead, Framed<Self::Io, ClientCodec>), SendRequestError>,
     >;
 
     /// Send request, returns Response and Framed
     fn open_tunnel<H: Into<RequestHeadType>>(self, head: H) -> Self::TunnelFuture {
         match self {
-            EitherConnection::A(con) => Box::new(
-                con.open_tunnel(head)
-                    .map(|(head, framed)| (head, framed.map_io(EitherIo::A))),
-            ),
-            EitherConnection::B(con) => Box::new(
-                con.open_tunnel(head)
-                    .map(|(head, framed)| (head, framed.map_io(EitherIo::B))),
-            ),
+            EitherConnection::A(con) => con
+                .open_tunnel(head)
+                .map(|res| res.map(|(head, framed)| (head, framed.map_io(EitherIo::A))))
+                .boxed_local(),
+            EitherConnection::B(con) => con
+                .open_tunnel(head)
+                .map(|res| res.map(|(head, framed)| (head, framed.map_io(EitherIo::B))))
+                .boxed_local(),
         }
     }
 }
@@ -218,24 +210,22 @@ pub enum EitherIo<A, B> {
     B(B),
 }
 
-impl<A, B> io::Read for EitherIo<A, B>
-where
-    A: io::Read,
-    B: io::Read,
-{
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        match self {
-            EitherIo::A(ref mut val) => val.read(buf),
-            EitherIo::B(ref mut val) => val.read(buf),
-        }
-    }
-}
-
 impl<A, B> AsyncRead for EitherIo<A, B>
 where
-    A: AsyncRead,
-    B: AsyncRead,
+    A: AsyncRead + Unpin,
+    B: AsyncRead + Unpin,
 {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<usize>> {
+        match self.get_mut() {
+            EitherIo::A(ref mut val) => Pin::new(val).poll_read(cx, buf),
+            EitherIo::B(ref mut val) => Pin::new(val).poll_read(cx, buf),
+        }
+    }
+
     unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
         match self {
             EitherIo::A(ref val) => val.prepare_uninitialized_buffer(buf),
@@ -244,45 +234,50 @@ where
     }
 }
 
-impl<A, B> io::Write for EitherIo<A, B>
-where
-    A: io::Write,
-    B: io::Write,
-{
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        match self {
-            EitherIo::A(ref mut val) => val.write(buf),
-            EitherIo::B(ref mut val) => val.write(buf),
-        }
-    }
-
-    fn flush(&mut self) -> io::Result<()> {
-        match self {
-            EitherIo::A(ref mut val) => val.flush(),
-            EitherIo::B(ref mut val) => val.flush(),
-        }
-    }
-}
-
 impl<A, B> AsyncWrite for EitherIo<A, B>
 where
-    A: AsyncWrite,
-    B: AsyncWrite,
+    A: AsyncWrite + Unpin,
+    B: AsyncWrite + Unpin,
 {
-    fn shutdown(&mut self) -> Poll<(), io::Error> {
-        match self {
-            EitherIo::A(ref mut val) => val.shutdown(),
-            EitherIo::B(ref mut val) => val.shutdown(),
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        match self.get_mut() {
+            EitherIo::A(ref mut val) => Pin::new(val).poll_write(cx, buf),
+            EitherIo::B(ref mut val) => Pin::new(val).poll_write(cx, buf),
         }
     }
 
-    fn write_buf<U: Buf>(&mut self, buf: &mut U) -> Poll<usize, io::Error>
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        match self.get_mut() {
+            EitherIo::A(ref mut val) => Pin::new(val).poll_flush(cx),
+            EitherIo::B(ref mut val) => Pin::new(val).poll_flush(cx),
+        }
+    }
+
+    fn poll_shutdown(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<io::Result<()>> {
+        match self.get_mut() {
+            EitherIo::A(ref mut val) => Pin::new(val).poll_shutdown(cx),
+            EitherIo::B(ref mut val) => Pin::new(val).poll_shutdown(cx),
+        }
+    }
+
+    fn poll_write_buf<U: Buf>(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut U,
+    ) -> Poll<Result<usize, io::Error>>
     where
         Self: Sized,
     {
-        match self {
-            EitherIo::A(ref mut val) => val.write_buf(buf),
-            EitherIo::B(ref mut val) => val.write_buf(buf),
+        match self.get_mut() {
+            EitherIo::A(ref mut val) => Pin::new(val).poll_write_buf(cx, buf),
+            EitherIo::B(ref mut val) => Pin::new(val).poll_write_buf(cx, buf),
         }
     }
 }

actix-http/src/client/connector.rs

@@ -11,6 +11,7 @@ use actix_connect::{
 };
 use actix_service::{apply_fn, Service};
 use actix_utils::timeout::{TimeoutError, TimeoutService};
+use futures::future::Ready;
 use http::Uri;
 use tokio_net::tcp::TcpStream;
 
@@ -116,12 +117,13 @@ impl<T, U> Connector<T, U> {
     /// Use custom connector.
     pub fn connector<T1, U1>(self, connector: T1) -> Connector<T1, U1>
     where
-        U1: AsyncRead + AsyncWrite + fmt::Debug,
+        U1: AsyncRead + AsyncWrite + Unpin + fmt::Debug,
         T1: Service<
                 Request = TcpConnect<Uri>,
                 Response = TcpConnection<Uri, U1>,
                 Error = actix_connect::ConnectError,
             > + Clone,
+        T1::Future: Unpin,
     {
         Connector {
             connector,
@@ -138,13 +140,12 @@ impl<T, U> Connector<T, U> {
 
 impl<T, U> Connector<T, U>
 where
-    U: AsyncRead + AsyncWrite + fmt::Debug + 'static,
+    U: AsyncRead + AsyncWrite + Unpin + fmt::Debug + 'static,
     T: Service<
             Request = TcpConnect<Uri>,
             Response = TcpConnection<Uri, U>,
             Error = actix_connect::ConnectError,
-        > + Clone
-        + 'static,
+        > + 'static,
 {
     /// Connection timeout, i.e. max time to connect to remote host including dns name resolution.
     /// Set to 1 second by default.
@@ -220,7 +221,7 @@ where
         {
             let connector = TimeoutService::new(
                 self.timeout,
-                apply_fn(self.connector, |msg: Connect, srv| {
+                apply_fn(UnpinWrapper(self.connector), |msg: Connect, srv| {
                     srv.call(TcpConnect::new(msg.uri).set_addr(msg.addr))
                 })
                 .map_err(ConnectError::from)
@@ -337,10 +338,48 @@ where
     }
 }
 
+#[derive(Clone)]
+struct UnpinWrapper<T>(T);
+
+impl<T: Service> Unpin for UnpinWrapper<T> {}
+
+impl<T: Service> Service for UnpinWrapper<T> {
+    type Request = T::Request;
+    type Response = T::Response;
+    type Error = T::Error;
+    type Future = UnpinWrapperFut<T>;
+
+    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), T::Error>> {
+        self.0.poll_ready(cx)
+    }
+
+    fn call(&mut self, req: T::Request) -> Self::Future {
+        UnpinWrapperFut {
+            fut: self.0.call(req),
+        }
+    }
+}
+
+struct UnpinWrapperFut<T: Service> {
+    fut: T::Future,
+}
+
+impl<T: Service> Unpin for UnpinWrapperFut<T> {}
+
+impl<T: Service> Future for UnpinWrapperFut<T> {
+    type Output = Result<T::Response, T::Error>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+        unsafe { Pin::new_unchecked(&mut self.get_mut().fut) }.poll(cx)
+    }
+}
+
 #[cfg(not(any(feature = "ssl", feature = "rust-tls")))]
 mod connect_impl {
-    use futures::future::{err, Either, FutureResult};
-    use futures::Poll;
+    use std::task::{Context, Poll};
+
+    use futures::future::{err, Either, Ready};
+    use futures::ready;
 
     use super::*;
     use crate::client::connection::IoConnection;
@@ -349,7 +388,7 @@ mod connect_impl {
     where
         Io: AsyncRead + AsyncWrite + 'static,
         T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
     {
         pub(crate) tcp_pool: ConnectionPool<T, Io>,
@@ -359,7 +398,7 @@ mod connect_impl {
     where
         Io: AsyncRead + AsyncWrite + 'static,
         T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
     {
         fn clone(&self) -> Self {
@@ -371,29 +410,30 @@ mod connect_impl {
 
     impl<T, Io> Service for InnerConnector<T, Io>
     where
-        Io: AsyncRead + AsyncWrite + 'static,
+        Io: AsyncRead + AsyncWrite + Unpin + 'static,
         T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
+        T::Future: Unpin,
     {
         type Request = Connect;
         type Response = IoConnection<Io>;
         type Error = ConnectError;
         type Future = Either<
             <ConnectionPool<T, Io> as Service>::Future,
-            FutureResult<IoConnection<Io>, ConnectError>,
+            Ready<Result<IoConnection<Io>, ConnectError>>,
         >;
 
-        fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-            self.tcp_pool.poll_ready()
+        fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
+            self.tcp_pool.poll_ready(cx)
         }
 
         fn call(&mut self, req: Connect) -> Self::Future {
             match req.uri.scheme_str() {
                 Some("https") | Some("wss") => {
-                    Either::B(err(ConnectError::SslIsNotSupported))
+                    Either::Right(err(ConnectError::SslIsNotSupported))
                 }
-                _ => Either::A(self.tcp_pool.call(req)),
+                _ => Either::Left(self.tcp_pool.call(req)),
             }
         }
     }
@@ -403,18 +443,20 @@ mod connect_impl {
 mod connect_impl {
     use std::marker::PhantomData;
 
-    use futures::future::{Either, FutureResult};
-    use futures::{Async, Future, Poll};
+    use futures::future::Either;
+    use futures::ready;
 
     use super::*;
     use crate::client::connection::EitherConnection;
 
     pub(crate) struct InnerConnector<T1, T2, Io1, Io2>
     where
-        Io1: AsyncRead + AsyncWrite + 'static,
-        Io2: AsyncRead + AsyncWrite + 'static,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
         T1: Service<Request = Connect, Response = (Io1, Protocol), Error = ConnectError>,
         T2: Service<Request = Connect, Response = (Io2, Protocol), Error = ConnectError>,
+        T1::Future: Unpin,
+        T2::Future: Unpin,
     {
         pub(crate) tcp_pool: ConnectionPool<T1, Io1>,
         pub(crate) ssl_pool: ConnectionPool<T2, Io2>,
@@ -422,14 +464,16 @@ mod connect_impl {
 
     impl<T1, T2, Io1, Io2> Clone for InnerConnector<T1, T2, Io1, Io2>
     where
-        Io1: AsyncRead + AsyncWrite + 'static,
-        Io2: AsyncRead + AsyncWrite + 'static,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
         T1: Service<Request = Connect, Response = (Io1, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
         T2: Service<Request = Connect, Response = (Io2, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
+        T1::Future: Unpin,
+        T2::Future: Unpin,
     {
         fn clone(&self) -> Self {
             InnerConnector {
@@ -441,52 +485,50 @@ mod connect_impl {
 
     impl<T1, T2, Io1, Io2> Service for InnerConnector<T1, T2, Io1, Io2>
     where
-        Io1: AsyncRead + AsyncWrite + 'static,
-        Io2: AsyncRead + AsyncWrite + 'static,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
         T1: Service<Request = Connect, Response = (Io1, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
         T2: Service<Request = Connect, Response = (Io2, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
+        T1::Future: Unpin,
+        T2::Future: Unpin,
     {
         type Request = Connect;
         type Response = EitherConnection<Io1, Io2>;
         type Error = ConnectError;
         type Future = Either<
-            FutureResult<Self::Response, Self::Error>,
-            Either<
-                InnerConnectorResponseA<T1, Io1, Io2>,
-                InnerConnectorResponseB<T2, Io1, Io2>,
-            >,
+            InnerConnectorResponseA<T1, Io1, Io2>,
+            InnerConnectorResponseB<T2, Io1, Io2>,
         >;
 
-        fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-            self.tcp_pool.poll_ready()
+        fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
+            self.tcp_pool.poll_ready(cx)
         }
 
         fn call(&mut self, req: Connect) -> Self::Future {
             match req.uri.scheme_str() {
-                Some("https") | Some("wss") => {
-                    Either::B(Either::B(InnerConnectorResponseB {
-                        fut: self.ssl_pool.call(req),
-                        _t: PhantomData,
-                    }))
-                }
-                _ => Either::B(Either::A(InnerConnectorResponseA {
+                Some("https") | Some("wss") => Either::B(InnerConnectorResponseB {
+                    fut: self.ssl_pool.call(req),
+                    _t: PhantomData,
+                }),
+                _ => Either::A(InnerConnectorResponseA {
                     fut: self.tcp_pool.call(req),
                     _t: PhantomData,
-                })),
+                }),
             }
         }
     }
 
     pub(crate) struct InnerConnectorResponseA<T, Io1, Io2>
     where
-        Io1: AsyncRead + AsyncWrite + 'static,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
         T: Service<Request = Connect, Response = (Io1, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
+        T::Future: Unpin,
     {
         fut: <ConnectionPool<T, Io1> as Service>::Future,
         _t: PhantomData<Io2>,
@@ -495,28 +537,29 @@ mod connect_impl {
     impl<T, Io1, Io2> Future for InnerConnectorResponseA<T, Io1, Io2>
     where
         T: Service<Request = Connect, Response = (Io1, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
-        Io1: AsyncRead + AsyncWrite + 'static,
-        Io2: AsyncRead + AsyncWrite + 'static,
+        T::Future: Unpin,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
     {
-        type Item = EitherConnection<Io1, Io2>;
-        type Error = ConnectError;
+        type Output = Result<EitherConnection<Io1, Io2>, ConnectError>;
 
-        fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-            match self.fut.poll()? {
-                Async::NotReady => Ok(Async::NotReady),
-                Async::Ready(res) => Ok(Async::Ready(EitherConnection::A(res))),
-            }
+        fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+            Poll::Ready(
+                ready!(Pin::new(&mut self.get_mut().fut).poll(cx))
+                    .map(|res| EitherConnection::A(res)),
+            )
         }
     }
 
     pub(crate) struct InnerConnectorResponseB<T, Io1, Io2>
     where
-        Io2: AsyncRead + AsyncWrite + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
         T: Service<Request = Connect, Response = (Io2, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
+        T::Future: Unpin,
     {
         fut: <ConnectionPool<T, Io2> as Service>::Future,
         _t: PhantomData<Io1>,
@@ -525,19 +568,19 @@ mod connect_impl {
     impl<T, Io1, Io2> Future for InnerConnectorResponseB<T, Io1, Io2>
     where
         T: Service<Request = Connect, Response = (Io2, Protocol), Error = ConnectError>
-            + Clone
+            + Unpin
             + 'static,
-        Io1: AsyncRead + AsyncWrite + 'static,
-        Io2: AsyncRead + AsyncWrite + 'static,
+        T::Future: Unpin,
+        Io1: AsyncRead + AsyncWrite + Unpin + 'static,
+        Io2: AsyncRead + AsyncWrite + Unpin + 'static,
     {
-        type Item = EitherConnection<Io1, Io2>;
-        type Error = ConnectError;
+        type Output = Result<EitherConnection<Io1, Io2>, ConnectError>;
 
-        fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-            match self.fut.poll()? {
-                Async::NotReady => Ok(Async::NotReady),
-                Async::Ready(res) => Ok(Async::Ready(EitherConnection::B(res))),
-            }
+        fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+            Poll::Ready(
+                ready!(Pin::new(&mut self.get_mut().fut).poll(cx))
+                    .map(|res| EitherConnection::B(res)),
+            )
         }
     }
 }

actix-http/src/client/h1proto.rs

@@ -6,8 +6,8 @@ use std::{io, time};
 
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use bytes::{BufMut, Bytes, BytesMut};
-use futures::future::{ok, Either};
-use futures::{Sink, Stream};
+use futures::future::{ok, poll_fn, Either};
+use futures::{Sink, SinkExt, Stream, StreamExt};
 
 use crate::error::PayloadError;
 use crate::h1;
@@ -21,15 +21,15 @@ use super::error::{ConnectError, SendRequestError};
 use super::pool::Acquired;
 use crate::body::{BodySize, MessageBody};
 
-pub(crate) fn send_request<T, B>(
+pub(crate) async fn send_request<T, B>(
     io: T,
     mut head: RequestHeadType,
     body: B,
     created: time::Instant,
     pool: Option<Acquired<T>>,
-) -> impl Future<Item = (ResponseHead, Payload), Error = SendRequestError>
+) -> Result<(ResponseHead, Payload), SendRequestError>
 where
-    T: AsyncRead + AsyncWrite + 'static,
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
     B: MessageBody,
 {
     // set request host header
@@ -65,68 +65,98 @@ where
         io: Some(io),
     };
 
-    let len = body.size();
-
     // create Framed and send request
-    Framed::new(io, h1::ClientCodec::default())
-        .send((head, len).into())
-        .from_err()
-        // send request body
-        .and_then(move |framed| match body.size() {
-            BodySize::None | BodySize::Empty | BodySize::Sized(0) => {
-                Either::A(ok(framed))
-            }
-            _ => Either::B(SendBody::new(body, framed)),
-        })
-        // read response and init read body
-        .and_then(|framed| {
-            framed
-                .into_future()
-                .map_err(|(e, _)| SendRequestError::from(e))
-                .and_then(|(item, framed)| {
-                    if let Some(res) = item {
-                        match framed.get_codec().message_type() {
-                            h1::MessageType::None => {
-                                let force_close = !framed.get_codec().keepalive();
-                                release_connection(framed, force_close);
-                                Ok((res, Payload::None))
-                            }
-                            _ => {
-                                let pl: PayloadStream = Box::new(PlStream::new(framed));
-                                Ok((res, pl.into()))
-                            }
-                        }
-                    } else {
-                        Err(ConnectError::Disconnected.into())
-                    }
-                })
-        })
+    let mut framed = Framed::new(io, h1::ClientCodec::default());
+    framed.send((head, body.size()).into()).await?;
+
+    // send request body
+    match body.size() {
+        BodySize::None | BodySize::Empty | BodySize::Sized(0) => (),
+        _ => send_body(body, &mut framed).await?,
+    };
+
+    // read response and init read body
+    let (head, framed) = if let (Some(result), framed) = framed.into_future().await {
+        let item = result.map_err(SendRequestError::from)?;
+        (item, framed)
+    } else {
+        return Err(SendRequestError::from(ConnectError::Disconnected));
+    };
+
+    match framed.get_codec().message_type() {
+        h1::MessageType::None => {
+            let force_close = !framed.get_codec().keepalive();
+            release_connection(framed, force_close);
+            Ok((head, Payload::None))
+        }
+        _ => {
+            let pl: PayloadStream = PlStream::new(framed).boxed_local();
+            Ok((head, pl.into()))
+        }
+    }
 }
 
-pub(crate) fn open_tunnel<T>(
+pub(crate) async fn open_tunnel<T>(
     io: T,
     head: RequestHeadType,
-) -> impl Future<Item = (ResponseHead, Framed<T, h1::ClientCodec>), Error = SendRequestError>
+) -> Result<(ResponseHead, Framed<T, h1::ClientCodec>), SendRequestError>
 where
-    T: AsyncRead + AsyncWrite + 'static,
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     // create Framed and send request
-    Framed::new(io, h1::ClientCodec::default())
-        .send((head, BodySize::None).into())
-        .from_err()
-        // read response
-        .and_then(|framed| {
-            framed
-                .into_future()
-                .map_err(|(e, _)| SendRequestError::from(e))
-                .and_then(|(head, framed)| {
-                    if let Some(head) = head {
-                        Ok((head, framed))
+    let mut framed = Framed::new(io, h1::ClientCodec::default());
+    framed.send((head, BodySize::None).into()).await?;
+
+    // read response
+    if let (Some(result), framed) = framed.into_future().await {
+        let head = result.map_err(SendRequestError::from)?;
+        Ok((head, framed))
+    } else {
+        Err(SendRequestError::from(ConnectError::Disconnected))
+    }
+}
+
+/// send request body to the peer
+pub(crate) async fn send_body<I, B>(
+    mut body: B,
+    framed: &mut Framed<I, h1::ClientCodec>,
+) -> Result<(), SendRequestError>
+where
+    I: ConnectionLifetime,
+    B: MessageBody,
+{
+    let mut eof = false;
+    while !eof {
+        while !eof && !framed.is_write_buf_full() {
+            match poll_fn(|cx| body.poll_next(cx)).await {
+                Some(result) => {
+                    framed.write(h1::Message::Chunk(Some(result?)))?;
+                }
+                None => {
+                    eof = true;
+                    framed.write(h1::Message::Chunk(None))?;
+                }
+            }
+        }
+
+        if !framed.is_write_buf_empty() {
+            poll_fn(|cx| match framed.flush(cx) {
+                Poll::Ready(Ok(_)) => Poll::Ready(Ok(())),
+                Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
+                Poll::Pending => {
+                    if !framed.is_write_buf_full() {
+                        Poll::Ready(Ok(()))
                     } else {
-                        Err(SendRequestError::from(ConnectError::Disconnected))
+                        Poll::Pending
                     }
-                })
-        })
+                }
+            })
+            .await?;
+        }
+    }
+
+    SinkExt::flush(framed).await?;
+    Ok(())
 }
 
 #[doc(hidden)]
@@ -137,7 +167,10 @@ pub struct H1Connection<T> {
     pool: Option<Acquired<T>>,
 }
 
-impl<T: AsyncRead + AsyncWrite + 'static> ConnectionLifetime for H1Connection<T> {
+impl<T> ConnectionLifetime for H1Connection<T>
+where
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
+{
     /// Close connection
     fn close(&mut self) {
         if let Some(mut pool) = self.pool.take() {
@@ -165,98 +198,41 @@ impl<T: AsyncRead + AsyncWrite + 'static> ConnectionLifetime for H1Connection<T>
     }
 }
 
-impl<T: AsyncRead + AsyncWrite + 'static> io::Read for H1Connection<T> {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        self.io.as_mut().unwrap().read(buf)
+impl<T: AsyncRead + AsyncWrite + Unpin + 'static> AsyncRead for H1Connection<T> {
+    unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
+        self.io.as_ref().unwrap().prepare_uninitialized_buffer(buf)
+    }
+
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<usize>> {
+        Pin::new(&mut self.io.as_mut().unwrap()).poll_read(cx, buf)
     }
 }
 
-impl<T: AsyncRead + AsyncWrite + 'static> AsyncRead for H1Connection<T> {}
-
-impl<T: AsyncRead + AsyncWrite + 'static> io::Write for H1Connection<T> {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
-        self.io.as_mut().unwrap().write(buf)
+impl<T: AsyncRead + AsyncWrite + Unpin + 'static> AsyncWrite for H1Connection<T> {
+    fn poll_write(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        Pin::new(&mut self.io.as_mut().unwrap()).poll_write(cx, buf)
     }
 
-    fn flush(&mut self) -> io::Result<()> {
-        self.io.as_mut().unwrap().flush()
+    fn poll_flush(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<io::Result<()>> {
+        Pin::new(self.io.as_mut().unwrap()).poll_flush(cx)
     }
-}
 
-impl<T: AsyncRead + AsyncWrite + 'static> AsyncWrite for H1Connection<T> {
-    fn shutdown(&mut self) -> Poll<(), io::Error> {
-        self.io.as_mut().unwrap().shutdown()
-    }
-}
-
-/// Future responsible for sending request body to the peer
-pub(crate) struct SendBody<I, B> {
-    body: Option<B>,
-    framed: Option<Framed<I, h1::ClientCodec>>,
-    flushed: bool,
-}
-
-impl<I, B> SendBody<I, B>
-where
-    I: AsyncRead + AsyncWrite + 'static,
-    B: MessageBody,
-{
-    pub(crate) fn new(body: B, framed: Framed<I, h1::ClientCodec>) -> Self {
-        SendBody {
-            body: Some(body),
-            framed: Some(framed),
-            flushed: true,
-        }
-    }
-}
-
-impl<I, B> Future for SendBody<I, B>
-where
-    I: ConnectionLifetime,
-    B: MessageBody,
-{
-    type Item = Framed<I, h1::ClientCodec>;
-    type Error = SendRequestError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        let mut body_ready = true;
-        loop {
-            while body_ready
-                && self.body.is_some()
-                && !self.framed.as_ref().unwrap().is_write_buf_full()
-            {
-                match self.body.as_mut().unwrap().poll_next()? {
-                    Async::Ready(item) => {
-                        // check if body is done
-                        if item.is_none() {
-                            let _ = self.body.take();
-                        }
-                        self.flushed = false;
-                        self.framed
-                            .as_mut()
-                            .unwrap()
-                            .force_send(h1::Message::Chunk(item))?;
-                        break;
-                    }
-                    Async::NotReady => body_ready = false,
-                }
-            }
-
-            if !self.flushed {
-                match self.framed.as_mut().unwrap().poll_complete()? {
-                    Async::Ready(_) => {
-                        self.flushed = true;
-                        continue;
-                    }
-                    Async::NotReady => return Ok(Async::NotReady),
-                }
-            }
-
-            if self.body.is_none() {
-                return Ok(Async::Ready(self.framed.take().unwrap()));
-            }
-            return Ok(Async::NotReady);
-        }
+    fn poll_shutdown(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context,
+    ) -> Poll<Result<(), io::Error>> {
+        Pin::new(self.io.as_mut().unwrap()).poll_shutdown(cx)
     }
 }
 
@@ -273,23 +249,24 @@ impl<Io: ConnectionLifetime> PlStream<Io> {
 }
 
 impl<Io: ConnectionLifetime> Stream for PlStream<Io> {
-    type Item = Bytes;
-    type Error = PayloadError;
+    type Item = Result<Bytes, PayloadError>;
 
-    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
-        match self.framed.as_mut().unwrap().poll()? {
-            Async::NotReady => Ok(Async::NotReady),
-            Async::Ready(Some(chunk)) => {
+    fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+        let this = self.get_mut();
+
+        match this.framed.as_mut().unwrap().next_item(cx)? {
+            Poll::Pending => Poll::Pending,
+            Poll::Ready(Some(chunk)) => {
                 if let Some(chunk) = chunk {
-                    Ok(Async::Ready(Some(chunk)))
+                    Poll::Ready(Some(Ok(chunk)))
                 } else {
-                    let framed = self.framed.take().unwrap();
+                    let framed = this.framed.take().unwrap();
                     let force_close = !framed.get_codec().keepalive();
                     release_connection(framed, force_close);
-                    Ok(Async::Ready(None))
+                    Poll::Ready(None)
                 }
             }
-            Async::Ready(None) => Ok(Async::Ready(None)),
+            Poll::Ready(None) => Poll::Ready(None),
         }
     }
 }

actix-http/src/client/h2proto.rs

@@ -5,7 +5,7 @@ use std::time;
 
 use actix_codec::{AsyncRead, AsyncWrite};
 use bytes::Bytes;
-use futures::future::{err, Either};
+use futures::future::{err, poll_fn, Either};
 use h2::{client::SendRequest, SendStream};
 use http::header::{HeaderValue, CONNECTION, CONTENT_LENGTH, TRANSFER_ENCODING};
 use http::{request::Request, HttpTryFrom, Method, Version};
@@ -19,15 +19,15 @@ use super::connection::{ConnectionType, IoConnection};
 use super::error::SendRequestError;
 use super::pool::Acquired;
 
-pub(crate) fn send_request<T, B>(
-    io: SendRequest<Bytes>,
+pub(crate) async fn send_request<T, B>(
+    mut io: SendRequest<Bytes>,
     head: RequestHeadType,
     body: B,
     created: time::Instant,
     pool: Option<Acquired<T>>,
-) -> impl Future<Item = (ResponseHead, Payload), Error = SendRequestError>
+) -> Result<(ResponseHead, Payload), SendRequestError>
 where
-    T: AsyncRead + AsyncWrite + 'static,
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
     B: MessageBody,
 {
     trace!("Sending client request: {:?} {:?}", head, body.size());
@@ -38,158 +38,138 @@ where
         _ => false,
     };
 
-    io.ready()
-        .map_err(SendRequestError::from)
-        .and_then(move |mut io| {
-            let mut req = Request::new(());
-            *req.uri_mut() = head.as_ref().uri.clone();
-            *req.method_mut() = head.as_ref().method.clone();
-            *req.version_mut() = Version::HTTP_2;
+    let mut req = Request::new(());
+    *req.uri_mut() = head.as_ref().uri.clone();
+    *req.method_mut() = head.as_ref().method.clone();
+    *req.version_mut() = Version::HTTP_2;
 
-            let mut skip_len = true;
-            // let mut has_date = false;
+    let mut skip_len = true;
+    // let mut has_date = false;
 
-            // Content length
-            let _ = match length {
-                BodySize::None => None,
-                BodySize::Stream => {
-                    skip_len = false;
-                    None
-                }
-                BodySize::Empty => req
-                    .headers_mut()
-                    .insert(CONTENT_LENGTH, HeaderValue::from_static("0")),
-                BodySize::Sized(len) => req.headers_mut().insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::try_from(format!("{}", len)).unwrap(),
-                ),
-                BodySize::Sized64(len) => req.headers_mut().insert(
-                    CONTENT_LENGTH,
-                    HeaderValue::try_from(format!("{}", len)).unwrap(),
-                ),
-            };
+    // Content length
+    let _ = match length {
+        BodySize::None => None,
+        BodySize::Stream => {
+            skip_len = false;
+            None
+        }
+        BodySize::Empty => req
+            .headers_mut()
+            .insert(CONTENT_LENGTH, HeaderValue::from_static("0")),
+        BodySize::Sized(len) => req.headers_mut().insert(
+            CONTENT_LENGTH,
+            HeaderValue::try_from(format!("{}", len)).unwrap(),
+        ),
+        BodySize::Sized64(len) => req.headers_mut().insert(
+            CONTENT_LENGTH,
+            HeaderValue::try_from(format!("{}", len)).unwrap(),
+        ),
+    };
 
-            // Extracting extra headers from RequestHeadType. HeaderMap::new() does not allocate.
-            let (head, extra_headers) = match head {
-                RequestHeadType::Owned(head) => {
-                    (RequestHeadType::Owned(head), HeaderMap::new())
-                }
-                RequestHeadType::Rc(head, extra_headers) => (
-                    RequestHeadType::Rc(head, None),
-                    extra_headers.unwrap_or_else(HeaderMap::new),
-                ),
-            };
+    // Extracting extra headers from RequestHeadType. HeaderMap::new() does not allocate.
+    let (head, extra_headers) = match head {
+        RequestHeadType::Owned(head) => (RequestHeadType::Owned(head), HeaderMap::new()),
+        RequestHeadType::Rc(head, extra_headers) => (
+            RequestHeadType::Rc(head, None),
+            extra_headers.unwrap_or_else(HeaderMap::new),
+        ),
+    };
 
-            // merging headers from head and extra headers.
-            let headers = head
-                .as_ref()
-                .headers
-                .iter()
-                .filter(|(name, _)| !extra_headers.contains_key(*name))
-                .chain(extra_headers.iter());
+    // merging headers from head and extra headers.
+    let headers = head
+        .as_ref()
+        .headers
+        .iter()
+        .filter(|(name, _)| !extra_headers.contains_key(*name))
+        .chain(extra_headers.iter());
 
-            // copy headers
-            for (key, value) in headers {
-                match *key {
-                    CONNECTION | TRANSFER_ENCODING => continue, // http2 specific
-                    CONTENT_LENGTH if skip_len => continue,
-                    // DATE => has_date = true,
-                    _ => (),
-                }
-                req.headers_mut().append(key, value.clone());
+    // copy headers
+    for (key, value) in headers {
+        match *key {
+            CONNECTION | TRANSFER_ENCODING => continue, // http2 specific
+            CONTENT_LENGTH if skip_len => continue,
+            // DATE => has_date = true,
+            _ => (),
+        }
+        req.headers_mut().append(key, value.clone());
+    }
+
+    let res = poll_fn(|cx| io.poll_ready(cx)).await;
+    if let Err(e) = res {
+        release(io, pool, created, e.is_io());
+        return Err(SendRequestError::from(e));
+    }
+
+    let resp = match io.send_request(req, eof) {
+        Ok((fut, send)) => {
+            release(io, pool, created, false);
+
+            if !eof {
+                send_body(body, send).await?;
             }
+            fut.await.map_err(SendRequestError::from)?
+        }
+        Err(e) => {
+            release(io, pool, created, e.is_io());
+            return Err(e.into());
+        }
+    };
 
-            match io.send_request(req, eof) {
-                Ok((res, send)) => {
-                    release(io, pool, created, false);
+    let (parts, body) = resp.into_parts();
+    let payload = if head_req { Payload::None } else { body.into() };
 
-                    if !eof {
-                        Either::A(Either::B(
-                            SendBody {
-                                body,
-                                send,
-                                buf: None,
-                            }
-                            .and_then(move |_| res.map_err(SendRequestError::from)),
-                        ))
-                    } else {
-                        Either::B(res.map_err(SendRequestError::from))
-                    }
-                }
-                Err(e) => {
-                    release(io, pool, created, e.is_io());
-                    Either::A(Either::A(err(e.into())))
-                }
-            }
-        })
-        .and_then(move |resp| {
-            let (parts, body) = resp.into_parts();
-            let payload = if head_req { Payload::None } else { body.into() };
-
-            let mut head = ResponseHead::new(parts.status);
-            head.version = parts.version;
-            head.headers = parts.headers.into();
-            Ok((head, payload))
-        })
-        .from_err()
+    let mut head = ResponseHead::new(parts.status);
+    head.version = parts.version;
+    head.headers = parts.headers.into();
+    Ok((head, payload))
 }
 
-struct SendBody<B: MessageBody> {
-    body: B,
-    send: SendStream<Bytes>,
-    buf: Option<Bytes>,
-}
-
-impl<B: MessageBody> Future for SendBody<B> {
-    type Item = ();
-    type Error = SendRequestError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        loop {
-            if self.buf.is_none() {
-                match self.body.poll_next() {
-                    Ok(Async::Ready(Some(buf))) => {
-                        self.send.reserve_capacity(buf.len());
-                        self.buf = Some(buf);
-                    }
-                    Ok(Async::Ready(None)) => {
-                        if let Err(e) = self.send.send_data(Bytes::new(), true) {
-                            return Err(e.into());
-                        }
-                        self.send.reserve_capacity(0);
-                        return Ok(Async::Ready(()));
-                    }
-                    Ok(Async::NotReady) => return Ok(Async::NotReady),
-                    Err(e) => return Err(e.into()),
+async fn send_body<B: MessageBody>(
+    mut body: B,
+    mut send: SendStream<Bytes>,
+) -> Result<(), SendRequestError> {
+    let mut buf = None;
+    loop {
+        if buf.is_none() {
+            match poll_fn(|cx| body.poll_next(cx)).await {
+                Some(Ok(b)) => {
+                    send.reserve_capacity(b.len());
+                    buf = Some(b);
                 }
-            }
-
-            match self.send.poll_capacity() {
-                Ok(Async::NotReady) => return Ok(Async::NotReady),
-                Ok(Async::Ready(None)) => return Ok(Async::Ready(())),
-                Ok(Async::Ready(Some(cap))) => {
-                    let mut buf = self.buf.take().unwrap();
-                    let len = buf.len();
-                    let bytes = buf.split_to(std::cmp::min(cap, len));
-
-                    if let Err(e) = self.send.send_data(bytes, false) {
+                Some(Err(e)) => return Err(e.into()),
+                None => {
+                    if let Err(e) = send.send_data(Bytes::new(), true) {
                         return Err(e.into());
-                    } else {
-                        if !buf.is_empty() {
-                            self.send.reserve_capacity(buf.len());
-                            self.buf = Some(buf);
-                        }
-                        continue;
                     }
+                    send.reserve_capacity(0);
+                    return Ok(());
                 }
-                Err(e) => return Err(e.into()),
             }
         }
+
+        match poll_fn(|cx| send.poll_capacity(cx)).await {
+            None => return Ok(()),
+            Some(Ok(cap)) => {
+                let b = buf.as_mut().unwrap();
+                let len = b.len();
+                let bytes = b.split_to(std::cmp::min(cap, len));
+
+                if let Err(e) = send.send_data(bytes, false) {
+                    return Err(e.into());
+                } else {
+                    if !b.is_empty() {
+                        send.reserve_capacity(b.len());
+                    }
+                    continue;
+                }
+            }
+            Some(Err(e)) => return Err(e.into()),
+        }
     }
 }
 
 // release SendRequest object
-fn release<T: AsyncRead + AsyncWrite + 'static>(
+fn release<T: AsyncRead + AsyncWrite + Unpin + 'static>(
     io: SendRequest<Bytes>,
     pool: Option<Acquired<T>>,
     created: time::Instant,

actix-http/src/client/pool.rs

@@ -9,11 +9,10 @@ use std::time::{Duration, Instant};
 
 use actix_codec::{AsyncRead, AsyncWrite};
 use actix_service::Service;
-use actix_utils::oneshot;
-use actix_utils::task::LocalWaker;
+use actix_utils::{oneshot, task::LocalWaker};
 use bytes::Bytes;
-use futures::future::{err, ok, Either, FutureResult};
-use h2::client::{handshake, Handshake};
+use futures::future::{err, ok, poll_fn, Either, FutureExt, LocalBoxFuture, Ready};
+use h2::client::{handshake, Connection, SendRequest};
 use hashbrown::HashMap;
 use http::uri::Authority;
 use indexmap::IndexSet;
@@ -43,17 +42,15 @@ impl From<Authority> for Key {
 }
 
 /// Connections pool
-pub(crate) struct ConnectionPool<T, Io: AsyncRead + AsyncWrite + 'static>(
-    T,
-    Rc<RefCell<Inner<Io>>>,
-);
+pub(crate) struct ConnectionPool<T, Io: 'static>(Rc<RefCell<T>>, Rc<RefCell<Inner<Io>>>);
 
 impl<T, Io> ConnectionPool<T, Io>
 where
     Io: AsyncRead + AsyncWrite + 'static,
     T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
-        + Clone
+        + Unpin
         + 'static,
+    T::Future: Unpin,
 {
     pub(crate) fn new(
         connector: T,
@@ -63,7 +60,7 @@ where
         limit: usize,
     ) -> Self {
         ConnectionPool(
-            connector,
+            Rc::new(RefCell::new(connector)),
             Rc::new(RefCell::new(Inner {
                 conn_lifetime,
                 conn_keep_alive,
@@ -73,7 +70,7 @@ where
                 waiters: Slab::new(),
                 waiters_queue: IndexSet::new(),
                 available: HashMap::new(),
-                task: None,
+                waker: LocalWaker::new(),
             })),
         )
     }
@@ -81,8 +78,7 @@ where
 
 impl<T, Io> Clone for ConnectionPool<T, Io>
 where
-    T: Clone,
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: 'static,
 {
     fn clone(&self) -> Self {
         ConnectionPool(self.0.clone(), self.1.clone())
@@ -91,86 +87,118 @@ where
 
 impl<T, Io> Service for ConnectionPool<T, Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
     T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
-        + Clone
+        + Unpin
         + 'static,
+    T::Future: Unpin,
 {
     type Request = Connect;
     type Response = IoConnection<Io>;
     type Error = ConnectError;
-    type Future = Either<
-        FutureResult<Self::Response, Self::Error>,
-        Either<WaitForConnection<Io>, OpenConnection<T::Future, Io>>,
-    >;
+    type Future = LocalBoxFuture<'static, Result<IoConnection<Io>, ConnectError>>;
 
-    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
-        self.0.poll_ready()
+    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
+        self.0.poll_ready(cx)
     }
 
     fn call(&mut self, req: Connect) -> Self::Future {
-        let key = if let Some(authority) = req.uri.authority_part() {
-            authority.clone().into()
-        } else {
-            return Either::A(err(ConnectError::Unresolverd));
+        // start support future
+        tokio_executor::current_thread::spawn(ConnectorPoolSupport {
+            connector: self.0.clone(),
+            inner: self.1.clone(),
+        });
+
+        let mut connector = self.0.clone();
+        let inner = self.1.clone();
+
+        let fut = async move {
+            let key = if let Some(authority) = req.uri.authority_part() {
+                authority.clone().into()
+            } else {
+                return Err(ConnectError::Unresolverd);
+            };
+
+            // acquire connection
+            match poll_fn(|cx| Poll::Ready(inner.borrow_mut().acquire(&key, cx))).await {
+                Acquire::Acquired(io, created) => {
+                    // use existing connection
+                    return Ok(IoConnection::new(
+                        io,
+                        created,
+                        Some(Acquired(key, Some(inner))),
+                    ));
+                }
+                Acquire::Available => {
+                    // open tcp connection
+                    let (io, proto) = connector.call(req).await?;
+
+                    let guard = OpenGuard::new(key, inner);
+
+                    if proto == Protocol::Http1 {
+                        Ok(IoConnection::new(
+                            ConnectionType::H1(io),
+                            Instant::now(),
+                            Some(guard.consume()),
+                        ))
+                    } else {
+                        let (snd, connection) = handshake(io).await?;
+                        tokio_executor::current_thread::spawn(connection.map(|_| ()));
+                        Ok(IoConnection::new(
+                            ConnectionType::H2(snd),
+                            Instant::now(),
+                            Some(guard.consume()),
+                        ))
+                    }
+                }
+                _ => {
+                    // connection is not available, wait
+                    let (rx, token) = inner.borrow_mut().wait_for(req);
+
+                    let guard = WaiterGuard::new(key, token, inner);
+                    let res = match rx.await {
+                        Err(_) => Err(ConnectError::Disconnected),
+                        Ok(res) => res,
+                    };
+                    guard.consume();
+                    res
+                }
+            }
         };
 
-        // acquire connection
-        match self.1.as_ref().borrow_mut().acquire(&key) {
-            Acquire::Acquired(io, created) => {
-                // use existing connection
-                return Either::A(ok(IoConnection::new(
-                    io,
-                    created,
-                    Some(Acquired(key, Some(self.1.clone()))),
-                )));
-            }
-            Acquire::Available => {
-                // open new connection
-                return Either::B(Either::B(OpenConnection::new(
-                    key,
-                    self.1.clone(),
-                    self.0.call(req),
-                )));
-            }
-            _ => (),
-        }
-
-        // connection is not available, wait
-        let (rx, token, support) = self.1.as_ref().borrow_mut().wait_for(req);
-
-        // start support future
-        if !support {
-            self.1.as_ref().borrow_mut().task = Some(AtomicTask::new());
-            tokio_executor::current_thread::spawn(ConnectorPoolSupport {
-                connector: self.0.clone(),
-                inner: self.1.clone(),
-            })
-        }
-
-        Either::B(Either::A(WaitForConnection {
-            rx,
-            key,
-            token,
-            inner: Some(self.1.clone()),
-        }))
+        fut.boxed_local()
     }
 }
 
-#[doc(hidden)]
-pub struct WaitForConnection<Io>
+struct WaiterGuard<Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     key: Key,
     token: usize,
-    rx: oneshot::Receiver<Result<IoConnection<Io>, ConnectError>>,
     inner: Option<Rc<RefCell<Inner<Io>>>>,
 }
 
-impl<Io> Drop for WaitForConnection<Io>
+impl<Io> WaiterGuard<Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
+{
+    fn new(key: Key, token: usize, inner: Rc<RefCell<Inner<Io>>>) -> Self {
+        Self {
+            key,
+            token,
+            inner: Some(inner),
+        }
+    }
+
+    fn consume(mut self) {
+        let _ = self.inner.take();
+    }
+}
+
+impl<Io> Drop for WaiterGuard<Io>
+where
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     fn drop(&mut self) {
         if let Some(i) = self.inner.take() {
@@ -181,113 +209,43 @@ where
     }
 }
 
-impl<Io> Future for WaitForConnection<Io>
+struct OpenGuard<Io>
 where
-    Io: AsyncRead + AsyncWrite,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
-    type Item = IoConnection<Io>;
-    type Error = ConnectError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        match self.rx.poll() {
-            Ok(Async::Ready(item)) => match item {
-                Err(err) => Err(err),
-                Ok(conn) => {
-                    let _ = self.inner.take();
-                    Ok(Async::Ready(conn))
-                }
-            },
-            Ok(Async::NotReady) => Ok(Async::NotReady),
-            Err(_) => {
-                let _ = self.inner.take();
-                Err(ConnectError::Disconnected)
-            }
-        }
-    }
-}
-
-#[doc(hidden)]
-pub struct OpenConnection<F, Io>
-where
-    Io: AsyncRead + AsyncWrite + 'static,
-{
-    fut: F,
     key: Key,
-    h2: Option<Handshake<Io, Bytes>>,
     inner: Option<Rc<RefCell<Inner<Io>>>>,
 }
 
-impl<F, Io> OpenConnection<F, Io>
+impl<Io> OpenGuard<Io>
 where
-    F: Future<Item = (Io, Protocol), Error = ConnectError>,
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
-    fn new(key: Key, inner: Rc<RefCell<Inner<Io>>>, fut: F) -> Self {
-        OpenConnection {
+    fn new(key: Key, inner: Rc<RefCell<Inner<Io>>>) -> Self {
+        Self {
             key,
-            fut,
             inner: Some(inner),
-            h2: None,
         }
     }
+
+    fn consume(mut self) -> Acquired<Io> {
+        Acquired(self.key.clone(), self.inner.take())
+    }
 }
 
-impl<F, Io> Drop for OpenConnection<F, Io>
+impl<Io> Drop for OpenGuard<Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     fn drop(&mut self) {
-        if let Some(inner) = self.inner.take() {
-            let mut inner = inner.as_ref().borrow_mut();
+        if let Some(i) = self.inner.take() {
+            let mut inner = i.as_ref().borrow_mut();
             inner.release();
             inner.check_availibility();
         }
     }
 }
 
-impl<F, Io> Future for OpenConnection<F, Io>
-where
-    F: Future<Item = (Io, Protocol), Error = ConnectError>,
-    Io: AsyncRead + AsyncWrite,
-{
-    type Item = IoConnection<Io>;
-    type Error = ConnectError;
-
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        if let Some(ref mut h2) = self.h2 {
-            return match h2.poll() {
-                Ok(Async::Ready((snd, connection))) => {
-                    tokio_executor::current_thread::spawn(connection.map_err(|_| ()));
-                    Ok(Async::Ready(IoConnection::new(
-                        ConnectionType::H2(snd),
-                        Instant::now(),
-                        Some(Acquired(self.key.clone(), self.inner.take())),
-                    )))
-                }
-                Ok(Async::NotReady) => Ok(Async::NotReady),
-                Err(e) => Err(e.into()),
-            };
-        }
-
-        match self.fut.poll() {
-            Err(err) => Err(err),
-            Ok(Async::Ready((io, proto))) => {
-                if proto == Protocol::Http1 {
-                    Ok(Async::Ready(IoConnection::new(
-                        ConnectionType::H1(io),
-                        Instant::now(),
-                        Some(Acquired(self.key.clone(), self.inner.take())),
-                    )))
-                } else {
-                    self.h2 = Some(handshake(io));
-                    self.poll()
-                }
-            }
-            Ok(Async::NotReady) => Ok(Async::NotReady),
-        }
-    }
-}
-
 enum Acquire<T> {
     Acquired(ConnectionType<T>, Instant),
     Available,
@@ -314,7 +272,7 @@ pub(crate) struct Inner<Io> {
         )>,
     >,
     waiters_queue: IndexSet<(Key, usize)>,
-    task: Option<AtomicTask>,
+    waker: LocalWaker,
 }
 
 impl<Io> Inner<Io> {
@@ -334,7 +292,7 @@ impl<Io> Inner<Io> {
 
 impl<Io> Inner<Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     /// connection is not available, wait
     fn wait_for(
@@ -343,7 +301,6 @@ where
     ) -> (
         oneshot::Receiver<Result<IoConnection<Io>, ConnectError>>,
         usize,
-        bool,
     ) {
         let (tx, rx) = oneshot::channel();
 
@@ -353,10 +310,10 @@ where
         entry.insert(Some((connect, tx)));
         assert!(self.waiters_queue.insert((key, token)));
 
-        (rx, token, self.task.is_some())
+        (rx, token)
     }
 
-    fn acquire(&mut self, key: &Key) -> Acquire<Io> {
+    fn acquire(&mut self, key: &Key, cx: &mut Context) -> Acquire<Io> {
         // check limits
         if self.limit > 0 && self.acquired >= self.limit {
             return Acquire::NotAvailable;
@@ -384,9 +341,9 @@ where
                     let mut io = conn.io;
                     let mut buf = [0; 2];
                     if let ConnectionType::H1(ref mut s) = io {
-                        match s.read(&mut buf) {
-                            Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => (),
-                            Ok(n) if n > 0 => {
+                        match Pin::new(s).poll_read(cx, &mut buf) {
+                            Poll::Pending => (),
+                            Poll::Ready(Ok(n)) if n > 0 => {
                                 if let Some(timeout) = self.disconnect_timeout {
                                     if let ConnectionType::H1(io) = io {
                                         tokio_executor::current_thread::spawn(
@@ -396,7 +353,7 @@ where
                                 }
                                 continue;
                             }
-                            Ok(_) | Err(_) => continue,
+                            _ => continue,
                         }
                     }
                     return Acquire::Acquired(io, conn.created);
@@ -431,9 +388,7 @@ where
 
     fn check_availibility(&self) {
         if !self.waiters_queue.is_empty() && self.acquired < self.limit {
-            if let Some(t) = self.task.as_ref() {
-                t.notify()
-            }
+            self.waker.wake();
         }
     }
 }
@@ -457,17 +412,16 @@ where
 
 impl<T> Future for CloseConnection<T>
 where
-    T: AsyncWrite,
+    T: AsyncWrite + Unpin,
 {
-    type Item = ();
-    type Error = ();
+    type Output = ();
 
-    fn poll(&mut self) -> Poll<(), ()> {
-        match self.timeout.poll() {
-            Ok(Async::Ready(_)) | Err(_) => Ok(Async::Ready(())),
-            Ok(Async::NotReady) => match self.io.shutdown() {
-                Ok(Async::Ready(_)) | Err(_) => Ok(Async::Ready(())),
-                Ok(Async::NotReady) => Ok(Async::NotReady),
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<()> {
+        match Pin::new(&mut self.timeout).poll(cx) {
+            Poll::Ready(_) => Poll::Ready(()),
+            Poll::Pending => match Pin::new(&mut self.io).poll_shutdown(cx) {
+                Poll::Ready(_) => Poll::Ready(()),
+                Poll::Pending => Poll::Pending,
             },
         }
     }
@@ -483,16 +437,18 @@ where
 
 impl<T, Io> Future for ConnectorPoolSupport<T, Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
-    T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>,
-    T::Future: 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
+    T: Service<Request = Connect, Response = (Io, Protocol), Error = ConnectError>
+        + Unpin,
+    T::Future: Unpin + 'static,
 {
-    type Item = ();
-    type Error = ();
+    type Output = ();
 
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        let mut inner = self.inner.as_ref().borrow_mut();
-        inner.task.as_ref().unwrap().register();
+    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+        let this = self.get_mut();
+
+        let mut inner = this.inner.as_ref().borrow_mut();
+        inner.waker.register(cx.waker());
 
         // check waiters
         loop {
@@ -507,14 +463,14 @@ where
                 continue;
             }
 
-            match inner.acquire(&key) {
+            match inner.acquire(&key, cx) {
                 Acquire::NotAvailable => break,
                 Acquire::Acquired(io, created) => {
                     let tx = inner.waiters.get_mut(token).unwrap().take().unwrap().1;
                     if let Err(conn) = tx.send(Ok(IoConnection::new(
                         io,
                         created,
-                        Some(Acquired(key.clone(), Some(self.inner.clone()))),
+                        Some(Acquired(key.clone(), Some(this.inner.clone()))),
                     ))) {
                         let (io, created) = conn.unwrap().into_inner();
                         inner.release_conn(&key, io, created);
@@ -526,33 +482,38 @@ where
                     OpenWaitingConnection::spawn(
                         key.clone(),
                         tx,
-                        self.inner.clone(),
-                        self.connector.call(connect),
+                        this.inner.clone(),
+                        this.connector.call(connect),
                     );
                 }
             }
             let _ = inner.waiters_queue.swap_remove_index(0);
         }
 
-        Ok(Async::NotReady)
+        Poll::Pending
     }
 }
 
 struct OpenWaitingConnection<F, Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     fut: F,
     key: Key,
-    h2: Option<Handshake<Io, Bytes>>,
+    h2: Option<
+        LocalBoxFuture<
+            'static,
+            Result<(SendRequest<Bytes>, Connection<Io, Bytes>), h2::Error>,
+        >,
+    >,
     rx: Option<oneshot::Sender<Result<IoConnection<Io>, ConnectError>>>,
     inner: Option<Rc<RefCell<Inner<Io>>>>,
 }
 
 impl<F, Io> OpenWaitingConnection<F, Io>
 where
-    F: Future<Item = (Io, Protocol), Error = ConnectError> + 'static,
-    Io: AsyncRead + AsyncWrite + 'static,
+    F: Future<Output = Result<(Io, Protocol), ConnectError>> + Unpin + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     fn spawn(
         key: Key,
@@ -572,7 +533,7 @@ where
 
 impl<F, Io> Drop for OpenWaitingConnection<F, Io>
 where
-    Io: AsyncRead + AsyncWrite + 'static,
+    Io: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     fn drop(&mut self) {
         if let Some(inner) = self.inner.take() {
@@ -585,59 +546,60 @@ where
 
 impl<F, Io> Future for OpenWaitingConnection<F, Io>
 where
-    F: Future<Item = (Io, Protocol), Error = ConnectError>,
-    Io: AsyncRead + AsyncWrite,
+    F: Future<Output = Result<(Io, Protocol), ConnectError>> + Unpin,
+    Io: AsyncRead + AsyncWrite + Unpin,
 {
-    type Item = ();
-    type Error = ();
+    type Output = ();
 
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        if let Some(ref mut h2) = self.h2 {
-            return match h2.poll() {
-                Ok(Async::Ready((snd, connection))) => {
-                    tokio_executor::current_thread::spawn(connection.map_err(|_| ()));
-                    let rx = self.rx.take().unwrap();
+    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+        let this = self.get_mut();
+
+        if let Some(ref mut h2) = this.h2 {
+            return match Pin::new(h2).poll(cx) {
+                Poll::Ready(Ok((snd, connection))) => {
+                    tokio_executor::current_thread::spawn(connection.map(|_| ()));
+                    let rx = this.rx.take().unwrap();
                     let _ = rx.send(Ok(IoConnection::new(
                         ConnectionType::H2(snd),
                         Instant::now(),
-                        Some(Acquired(self.key.clone(), self.inner.take())),
+                        Some(Acquired(this.key.clone(), this.inner.take())),
                     )));
-                    Ok(Async::Ready(()))
+                    Poll::Ready(())
                 }
-                Ok(Async::NotReady) => Ok(Async::NotReady),
-                Err(err) => {
-                    let _ = self.inner.take();
-                    if let Some(rx) = self.rx.take() {
+                Poll::Pending => Poll::Pending,
+                Poll::Ready(Err(err)) => {
+                    let _ = this.inner.take();
+                    if let Some(rx) = this.rx.take() {
                         let _ = rx.send(Err(ConnectError::H2(err)));
                     }
-                    Err(())
+                    Poll::Ready(())
                 }
             };
         }
 
-        match self.fut.poll() {
-            Err(err) => {
-                let _ = self.inner.take();
-                if let Some(rx) = self.rx.take() {
+        match Pin::new(&mut this.fut).poll(cx) {
+            Poll::Ready(Err(err)) => {
+                let _ = this.inner.take();
+                if let Some(rx) = this.rx.take() {
                     let _ = rx.send(Err(err));
                 }
-                Err(())
+                Poll::Ready(())
             }
-            Ok(Async::Ready((io, proto))) => {
+            Poll::Ready(Ok((io, proto))) => {
                 if proto == Protocol::Http1 {
-                    let rx = self.rx.take().unwrap();
+                    let rx = this.rx.take().unwrap();
                     let _ = rx.send(Ok(IoConnection::new(
                         ConnectionType::H1(io),
                         Instant::now(),
-                        Some(Acquired(self.key.clone(), self.inner.take())),
+                        Some(Acquired(this.key.clone(), this.inner.take())),
                     )));
-                    Ok(Async::Ready(()))
+                    Poll::Ready(())
                 } else {
-                    self.h2 = Some(handshake(io));
-                    self.poll()
+                    this.h2 = Some(handshake(io).boxed_local());
+                    Pin::new(this).poll(cx)
                 }
             }
-            Ok(Async::NotReady) => Ok(Async::NotReady),
+            Poll::Pending => Poll::Pending,
         }
     }
 }
@@ -646,7 +608,7 @@ pub(crate) struct Acquired<T>(Key, Option<Rc<RefCell<Inner<T>>>>);
 
 impl<T> Acquired<T>
 where
-    T: AsyncRead + AsyncWrite + 'static,
+    T: AsyncRead + AsyncWrite + Unpin + 'static,
 {
     pub(crate) fn close(&mut self, conn: IoConnection<T>) {
         if let Some(inner) = self.1.take() {

actix-http/src/h1/utils.rs

@@ -55,7 +55,7 @@ where
                             if item.is_none() {
                                 let _ = this.body.take();
                             }
-                            framed.force_send(Message::Chunk(item))?;
+                            framed.write(Message::Chunk(item))?;
                         }
                         Poll::Pending => body_ready = false,
                     }
@@ -78,7 +78,7 @@ where
 
             // send response
             if let Some(res) = this.res.take() {
-                framed.force_send(res)?;
+                framed.write(res)?;
                 continue;
             }
 

actix-http/src/lib.rs

@@ -13,7 +13,7 @@ extern crate log;
 
 pub mod body;
 mod builder;
-// pub mod client;
+pub mod client;
 mod cloneable;
 mod config;
 pub mod encoding;
@@ -32,8 +32,8 @@ pub mod cookie;
 pub mod error;
 pub mod h1;
 pub mod h2;
-// pub mod test;
-// pub mod ws;
+pub mod test;
+pub mod ws;
 
 pub use self::builder::HttpServiceBuilder;
 pub use self::config::{KeepAlive, ServiceConfig};

actix-http/src/test.rs

@@ -1,6 +1,6 @@
 //! Test Various helpers for Actix applications to use during testing.
 use std::fmt::Write as FmtWrite;
-use std::io;
+use std::io::{self, Read, Write};
 use std::pin::Pin;
 use std::str::FromStr;
 use std::task::{Context, Poll};
@@ -245,16 +245,33 @@ impl io::Write for TestBuffer {
     }
 }
 
-// impl AsyncRead for TestBuffer {}
+impl AsyncRead for TestBuffer {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        _: &mut Context<'_>,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<usize>> {
+        Poll::Ready(self.get_mut().read(buf))
+    }
+}
 
-// impl AsyncWrite for TestBuffer {
-//     fn shutdown(&mut self) -> Poll<(), io::Error> {
-//         Ok(Async::Ready(()))
-//     }
-//     fn write_buf<B: Buf>(&mut self, _: &mut B) -> Poll<usize, io::Error> {
-//         Ok(Async::NotReady)
-//     }
-// }
+impl AsyncWrite for TestBuffer {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        _: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        Poll::Ready(self.get_mut().write(buf))
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Poll::Ready(Ok(()))
+    }
+}
 
 impl IoStream for TestBuffer {
     fn set_nodelay(&mut self, _nodelay: bool) -> io::Result<()> {

actix-http/src/ws/transport.rs

@@ -1,24 +1,27 @@
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
 use actix_codec::{AsyncRead, AsyncWrite, Framed};
 use actix_service::{IntoService, Service};
 use actix_utils::framed::{FramedTransport, FramedTransportError};
-use futures::{Future, Poll};
 
 use super::{Codec, Frame, Message};
 
 pub struct Transport<S, T>
 where
     S: Service<Request = Frame, Response = Message> + 'static,
-    T: AsyncRead + AsyncWrite,
+    T: AsyncRead + AsyncWrite + Unpin,
 {
     inner: FramedTransport<S, T, Codec>,
 }
 
 impl<S, T> Transport<S, T>
 where
-    T: AsyncRead + AsyncWrite,
-    S: Service<Request = Frame, Response = Message>,
+    T: AsyncRead + AsyncWrite + Unpin,
+    S: Service<Request = Frame, Response = Message> + Unpin,
     S::Future: 'static,
-    S::Error: 'static,
+    S::Error: Unpin + 'static,
 {
     pub fn new<F: IntoService<S>>(io: T, service: F) -> Self {
         Transport {
@@ -35,15 +38,14 @@ where
 
 impl<S, T> Future for Transport<S, T>
 where
-    T: AsyncRead + AsyncWrite,
-    S: Service<Request = Frame, Response = Message>,
+    T: AsyncRead + AsyncWrite + Unpin,
+    S: Service<Request = Frame, Response = Message> + Unpin,
     S::Future: 'static,
-    S::Error: 'static,
+    S::Error: Unpin + 'static,
 {
-    type Item = ();
-    type Error = FramedTransportError<S::Error, Codec>;
+    type Output = Result<(), FramedTransportError<S::Error, Codec>>;
 
-    fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
-        self.inner.poll()
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+        Pin::new(&mut self.inner).poll(cx)
     }
 }