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Code Issues Releases Wiki Activity

Remove several uses of Pin::new_unchecked (#1294)

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Most of the relevant struct already had a `#[pin_project]` attribute,
but it wasn't being used.

The remaining uses of `Pin::new_unchecked` all involve going from a
`&mut T` to a `Pin<&mut T>`, without directly observing a `Pin<&mut T>`
first. As such, they cannot be replaced by `pin_project`

Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>
This commit is contained in:
Aaron Hill 2020-01-27 22:35:51 -05:00 committed by Yuki Okushi
parent d137a8635b
commit 74dcc7366d
2 changed files with 22 additions and 16 deletions
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19
actix-http/src/client/pool.rs
View File

@ -488,10 +488,12 @@ where
}
}
#[pin_project::pin_project(PinnedDrop)]
struct OpenWaitingConnection<F, Io>
where
Io: AsyncRead + AsyncWrite + Unpin + 'static,
{
#[pin]
fut: F,
key: Key,
h2: Option<
@ -525,12 +527,13 @@ where
}
}
impl<F, Io> Drop for OpenWaitingConnection<F, Io>
#[pin_project::pinned_drop]
impl<F, Io> PinnedDrop for OpenWaitingConnection<F, Io>
where
Io: AsyncRead + AsyncWrite + Unpin + 'static,
{
fn drop(&mut self) {
if let Some(inner) = self.inner.take() {
fn drop(self: Pin<&mut Self>) {
if let Some(inner) = self.project().inner.take() {
let mut inner = inner.as_ref().borrow_mut();
inner.release();
inner.check_availibility();
@ -545,8 +548,8 @@ where
{
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = unsafe { self.get_unchecked_mut() };
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.as_mut().project();
if let Some(ref mut h2) = this.h2 {
return match Pin::new(h2).poll(cx) {
@ -571,7 +574,7 @@ where
};
}
match unsafe { Pin::new_unchecked(&mut this.fut) }.poll(cx) {
match this.fut.poll(cx) {
Poll::Ready(Err(err)) => {
let _ = this.inner.take();
if let Some(rx) = this.rx.take() {
@ -589,8 +592,8 @@ where
)));
Poll::Ready(())
} else {
this.h2 = Some(handshake(io).boxed_local());
unsafe { Pin::new_unchecked(this) }.poll(cx)
*this.h2 = Some(handshake(io).boxed_local());
self.poll(cx)
}
}
Poll::Pending => Poll::Pending,

19
actix-http/src/h2/dispatcher.rs
View File

@ -158,14 +158,16 @@ where
#[pin_project::pin_project]
struct ServiceResponse<F, I, E, B> {
#[pin]
state: ServiceResponseState<F, B>,
config: ServiceConfig,
buffer: Option<Bytes>,
_t: PhantomData<(I, E)>,
}
#[pin_project::pin_project]
enum ServiceResponseState<F, B> {
ServiceCall(F, Option<SendResponse<Bytes>>),
ServiceCall(#[pin] F, Option<SendResponse<Bytes>>),
SendPayload(SendStream<Bytes>, ResponseBody<B>),
}
@ -247,12 +249,14 @@ where
{
type Output = ();
#[pin_project::project]
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.as_mut().project();
match this.state {
ServiceResponseState::ServiceCall(ref mut call, ref mut send) => {
match unsafe { Pin::new_unchecked(call) }.poll(cx) {
#[project]
match this.state.project() {
ServiceResponseState::ServiceCall(call, send) => {
match call.poll(cx) {
Poll::Ready(Ok(res)) => {
let (res, body) = res.into().replace_body(());
@ -273,8 +277,7 @@ where
if size.is_eof() {
Poll::Ready(())
} else {
*this.state =
ServiceResponseState::SendPayload(stream, body);
this.state.set(ServiceResponseState::SendPayload(stream, body));
self.poll(cx)
}
}
@ -300,10 +303,10 @@ where
if size.is_eof() {
Poll::Ready(())
} else {
*this.state = ServiceResponseState::SendPayload(
this.state.set(ServiceResponseState::SendPayload(
stream,
body.into_body(),
);
));
self.poll(cx)
}
}