refactor(lib): Switch from pin-project to pin-project-lite

Cargo.toml

@@ -34,7 +34,7 @@ httparse = "1.0"
 h2 = { version = "0.3", optional = true }
 itoa = "0.4.1"
 tracing = { version = "0.1", default-features = false, features = ["std"] }
-pin-project = "1.0"
+pin-project-lite = "0.2.4"
 tower-service = "0.3"
 tokio = { version = "1", features = ["sync"] }
 want = "0.3"

src/client/conn.rs

@@ -56,7 +56,7 @@ use std::time::Duration;
 
 use bytes::Bytes;
 use futures_util::future::{self, Either, FutureExt as _};
-use pin_project::pin_project;
+use pin_project_lite::pin_project;
 use tokio::io::{AsyncRead, AsyncWrite};
 use tower_service::Service;
 
@@ -75,15 +75,23 @@ use crate::{Body, Request, Response};
 #[cfg(feature = "http1")]
 type Http1Dispatcher<T, B, R> = proto::dispatch::Dispatcher<proto::dispatch::Client<B>, B, T, R>;
 
-#[pin_project(project = ProtoClientProj)]
-enum ProtoClient<T, B>
-where
- B: HttpBody,
-{
- #[cfg(feature = "http1")]
- H1(#[pin] Http1Dispatcher<T, B, proto::h1::ClientTransaction>),
- #[cfg(feature = "http2")]
- H2(#[pin] proto::h2::ClientTask<B>, PhantomData<fn(T)>),
+pin_project! {
+ #[project = ProtoClientProj]
+ enum ProtoClient<T, B>
+ where
+ B: HttpBody,
+ {
+ #[cfg(feature = "http1")]
+ H1 {
+ #[pin]
+ h1: Http1Dispatcher<T, B, proto::h1::ClientTransaction>,
+ },
+ #[cfg(feature = "http2")]
+ H2 {
+ #[pin]
+ h2: proto::h2::ClientTask<B>, _phantom: PhantomData<fn(T)>,
+ },
+ }
 }
 
 /// Returns a handshake future over some IO.
@@ -400,7 +408,7 @@ where
  pub fn into_parts(self) -> Parts<T> {
  match self.inner.expect("already upgraded") {
  #[cfg(feature = "http1")]
- ProtoClient::H1(h1) => {
+ ProtoClient::H1 { h1 } => {
  let (io, read_buf, _) = h1.into_inner();
  Parts {
  io,
@@ -409,7 +417,7 @@ where
  }
  }
  #[cfg(feature = "http2")]
- ProtoClient::H2(..) => {
+ ProtoClient::H2 { .. } => {
  panic!("http2 cannot into_inner");
  }
  }
@@ -429,9 +437,9 @@ where
  pub fn poll_without_shutdown(&mut self, cx: &mut task::Context<'_>) -> Poll<crate::Result<()>> {
  match *self.inner.as_mut().expect("already upgraded") {
  #[cfg(feature = "http1")]
- ProtoClient::H1(ref mut h1) => h1.poll_without_shutdown(cx),
+ ProtoClient::H1 { ref mut h1 } => h1.poll_without_shutdown(cx),
  #[cfg(feature = "http2")]
- ProtoClient::H2(ref mut h2, _) => Pin::new(h2).poll(cx).map_ok(|_| ()),
+ ProtoClient::H2 { ref mut h2, .. } => Pin::new(h2).poll(cx).map_ok(|_| ()),
  }
  }
 
@@ -460,7 +468,7 @@ where
  proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
  #[cfg(feature = "http1")]
  proto::Dispatched::Upgrade(pending) => match self.inner.take() {
- Some(ProtoClient::H1(h1)) => {
+ Some(ProtoClient::H1 { h1 }) => {
  let (io, buf, _) = h1.into_inner();
  pending.fulfill(Upgraded::new(io, buf));
  Poll::Ready(Ok(()))
@@ -707,14 +715,17 @@ impl Builder {
  }
  let cd = proto::h1::dispatch::Client::new(rx);
  let dispatch = proto::h1::Dispatcher::new(cd, conn);
- ProtoClient::H1(dispatch)
+ ProtoClient::H1 { h1: dispatch }
  }
  #[cfg(feature = "http2")]
  Proto::Http2 => {
  let h2 =
  proto::h2::client::handshake(io, rx, &opts.h2_builder, opts.exec.clone())
  .await?;
- ProtoClient::H2(h2, PhantomData)
+ ProtoClient::H2 {
+ h2,
+ _phantom: PhantomData,
+ }
  }
  };
 
@@ -768,9 +779,9 @@ where
  fn poll(self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
  match self.project() {
  #[cfg(feature = "http1")]
- ProtoClientProj::H1(c) => c.poll(cx),
+ ProtoClientProj::H1 { h1 } => h1.poll(cx),
  #[cfg(feature = "http2")]
- ProtoClientProj::H2(c, _) => c.poll(cx),
+ ProtoClientProj::H2 { h2, .. } => h2.poll(cx),
  }
  }
 }

src/client/connect/http.rs

@@ -11,7 +11,7 @@ use std::time::Duration;
 
 use futures_util::future::Either;
 use http::uri::{Scheme, Uri};
-use pin_project::pin_project;
+use pin_project_lite::pin_project;
 use tokio::net::{TcpSocket, TcpStream};
 use tokio::time::Sleep;
 
@@ -373,18 +373,19 @@ impl HttpInfo {
  }
 }
 
-// Not publicly exported (so missing_docs doesn't trigger).
-//
-// We return this `Future` instead of the `Pin<Box<dyn Future>>` directly
-// so that users don't rely on it fitting in a `Pin<Box<dyn Future>>` slot
-// (and thus we can change the type in the future).
-#[must_use = "futures do nothing unless polled"]
-#[pin_project]
-#[allow(missing_debug_implementations)]
-pub struct HttpConnecting<R> {
- #[pin]
- fut: BoxConnecting,
- _marker: PhantomData<R>,
+pin_project! {
+ // Not publicly exported (so missing_docs doesn't trigger).
+ //
+ // We return this `Future` instead of the `Pin<Box<dyn Future>>` directly
+ // so that users don't rely on it fitting in a `Pin<Box<dyn Future>>` slot
+ // (and thus we can change the type in the future).
+ #[must_use = "futures do nothing unless polled"]
+ #[allow(missing_debug_implementations)]
+ pub struct HttpConnecting<R> {
+ #[pin]
+ fut: BoxConnecting,
+ _marker: PhantomData<R>,
+ }
 }
 
 type ConnectResult = Result<TcpStream, ConnectError>;

src/client/pool.rs

@@ -11,7 +11,7 @@ use futures_channel::oneshot;
 use tokio::time::{Duration, Instant, Interval};
 
 use super::client::Ver;
-use crate::common::{task, exec::Exec, Future, Pin, Poll, Unpin};
+use crate::common::{exec::Exec, task, Future, Pin, Poll, Unpin};
 
 // FIXME: allow() required due to `impl Trait` leaking types to this lint
 #[allow(missing_debug_implementations)]
@@ -714,16 +714,17 @@ impl Expiration {
 }
 
 #[cfg(feature = "runtime")]
-#[pin_project::pin_project]
-struct IdleTask<T> {
- #[pin]
- interval: Interval,
- pool: WeakOpt<Mutex<PoolInner<T>>>,
- // This allows the IdleTask to be notified as soon as the entire
- // Pool is fully dropped, and shutdown. This channel is never sent on,
- // but Err(Canceled) will be received when the Pool is dropped.
- #[pin]
- pool_drop_notifier: oneshot::Receiver<crate::common::Never>,
+pin_project_lite::pin_project! {
+ struct IdleTask<T> {
+ #[pin]
+ interval: Interval,
+ pool: WeakOpt<Mutex<PoolInner<T>>>,
+ // This allows the IdleTask to be notified as soon as the entire
+ // Pool is fully dropped, and shutdown. This channel is never sent on,
+ // but Err(Canceled) will be received when the Pool is dropped.
+ #[pin]
+ pool_drop_notifier: oneshot::Receiver<crate::common::Never>,
+ }
 }
 
 #[cfg(feature = "runtime")]
@@ -776,7 +777,7 @@ mod tests {
  use std::time::Duration;
 
  use super::{Connecting, Key, Pool, Poolable, Reservation, WeakOpt};
- use crate::common::{task, exec::Exec, Future, Pin};
+ use crate::common::{exec::Exec, task, Future, Pin};
 
  /// Test unique reservations.
  #[derive(Debug, PartialEq, Eq)]

src/common/drain.rs

@@ -1,6 +1,6 @@
 use std::mem;
 
-use pin_project::pin_project;
+use pin_project_lite::pin_project;
 use tokio::sync::watch;
 
 use super::{task, Future, Pin, Poll};
@@ -21,14 +21,15 @@ pub(crate) struct Watch {
  rx: watch::Receiver<()>,
 }
 
-#[allow(missing_debug_implementations)]
-#[pin_project]
-pub struct Watching<F, FN> {
- #[pin]
- future: F,
- state: State<FN>,
- watch: Pin<Box<dyn Future<Output = ()> + Send + Sync>>,
- _rx: watch::Receiver<()>,
+pin_project! {
+ #[allow(missing_debug_implementations)]
+ pub struct Watching<F, FN> {
+ #[pin]
+ future: F,
+ state: State<FN>,
+ watch: Pin<Box<dyn Future<Output = ()> + Send + Sync>>,
+ _rx: watch::Receiver<()>,
+ }
 }
 
 enum State<F> {

src/proto/h1/dispatch.rs

@@ -44,10 +44,13 @@ cfg_server! {
 }
 
 cfg_client! {
- pub(crate) struct Client<B> {
- callback: Option<crate::client::dispatch::Callback<Request<B>, http::Response<Body>>>,
- rx: ClientRx<B>,
- rx_closed: bool,
+ pin_project_lite::pin_project! {
+ pub(crate) struct Client<B> {
+ callback: Option<crate::client::dispatch::Callback<Request<B>, http::Response<Body>>>,
+ #[pin]
+ rx: ClientRx<B>,
+ rx_closed: bool,
+ }
  }
 
  type ClientRx<B> = crate::client::dispatch::Receiver<Request<B>, http::Response<Body>>;

src/proto/h2/mod.rs

@@ -5,7 +5,7 @@ use http::header::{
  TRANSFER_ENCODING, UPGRADE,
 };
 use http::HeaderMap;
-use pin_project::pin_project;
+use pin_project_lite::pin_project;
 use std::error::Error as StdError;
 use std::io::IoSlice;
 
@@ -94,15 +94,16 @@ fn decode_content_length(headers: &HeaderMap) -> DecodedLength {
 
 // body adapters used by both Client and Server
 
-#[pin_project]
-struct PipeToSendStream<S>
-where
- S: HttpBody,
-{
- body_tx: SendStream<SendBuf<S::Data>>,
- data_done: bool,
- #[pin]
- stream: S,
+pin_project! {
+ struct PipeToSendStream<S>
+ where
+ S: HttpBody,
+ {
+ body_tx: SendStream<SendBuf<S::Data>>,
+ data_done: bool,
+ #[pin]
+ stream: S,
+ }
 }
 
 impl<S> PipeToSendStream<S>