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fix(comms/rpc): detect early close in all cases
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| // Copyright 2022. The Tari Project | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without modification, are permitted provided that the | ||
| // following conditions are met: | ||
| // | ||
| // 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following | ||
| // disclaimer. | ||
| // | ||
| // 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the | ||
| // following disclaimer in the documentation and/or other materials provided with the distribution. | ||
| // | ||
| // 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote | ||
| // products derived from this software without specific prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | ||
| // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | ||
| // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE | ||
| // USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
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| use std::{ | ||
| io, | ||
| pin::Pin, | ||
| task::{Context, Poll}, | ||
| }; | ||
|
|
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| use futures::Sink; | ||
| use tokio_stream::Stream; | ||
|
|
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| pub struct EarlyClose<TSock> { | ||
| inner: TSock, | ||
| } | ||
|
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| impl<T, TSock: Stream<Item = io::Result<T>> + Unpin> EarlyClose<TSock> { | ||
| pub fn new(inner: TSock) -> Self { | ||
| Self { inner } | ||
| } | ||
| } | ||
|
|
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| impl<TSock: Stream + Unpin> Stream for EarlyClose<TSock> { | ||
| type Item = TSock::Item; | ||
|
|
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| fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { | ||
| Pin::new(&mut self.inner).poll_next(cx) | ||
| } | ||
| } | ||
|
|
||
| impl<TItem, TSock, T> Sink<TItem> for EarlyClose<TSock> | ||
| where TSock: Sink<TItem, Error = io::Error> + Stream<Item = io::Result<T>> + Unpin | ||
| { | ||
| type Error = EarlyCloseError<T>; | ||
|
|
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| fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| if let Poll::Ready(r) = Pin::new(&mut self.inner).poll_ready(cx) { | ||
| return Poll::Ready(r.map_err(Into::into)); | ||
| } | ||
| check_for_early_close(&mut self.inner, cx) | ||
| } | ||
|
|
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| fn start_send(mut self: Pin<&mut Self>, item: TItem) -> Result<(), Self::Error> { | ||
| Pin::new(&mut self.inner).start_send(item)?; | ||
| Ok(()) | ||
| } | ||
|
|
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| fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| if let Poll::Ready(r) = Pin::new(&mut self.inner).poll_flush(cx) { | ||
| return Poll::Ready(r.map_err(Into::into)); | ||
| } | ||
| check_for_early_close(&mut self.inner, cx) | ||
| } | ||
|
|
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| fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| if let Poll::Ready(r) = Pin::new(&mut self.inner).poll_close(cx) { | ||
| return Poll::Ready(r.map_err(Into::into)); | ||
| } | ||
| check_for_early_close(&mut self.inner, cx) | ||
| } | ||
| } | ||
|
|
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| fn check_for_early_close<T, TSock: Stream<Item = io::Result<T>> + Unpin>( | ||
| sock: &mut TSock, | ||
| cx: &mut Context<'_>, | ||
| ) -> Poll<Result<(), EarlyCloseError<T>>> { | ||
| match Pin::new(sock).poll_next(cx) { | ||
| Poll::Ready(Some(Ok(msg))) => Poll::Ready(Err(EarlyCloseError::UnexpectedMessage(msg))), | ||
| Poll::Ready(Some(Err(err))) if err.kind() == io::ErrorKind::WouldBlock => Poll::Pending, | ||
| Poll::Pending => Poll::Pending, | ||
| Poll::Ready(Some(Err(err))) => Poll::Ready(Err(err.into())), | ||
| Poll::Ready(None) => Poll::Ready(Err( | ||
| io::Error::new(io::ErrorKind::BrokenPipe, "Connection closed").into() | ||
| )), | ||
| } | ||
| } | ||
|
|
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| #[derive(Debug, thiserror::Error)] | ||
| pub enum EarlyCloseError<T> { | ||
| #[error(transparent)] | ||
| Io(#[from] io::Error), | ||
| #[error("Unexpected message")] | ||
| UnexpectedMessage(T), | ||
| } | ||
|
|
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| impl<T> EarlyCloseError<T> { | ||
| pub fn io(&self) -> Option<&io::Error> { | ||
| match self { | ||
| Self::Io(err) => Some(err), | ||
| _ => None, | ||
| } | ||
| } | ||
|
|
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| pub fn unexpected_message(&self) -> Option<&T> { | ||
| match self { | ||
| EarlyCloseError::UnexpectedMessage(msg) => Some(msg), | ||
| _ => None, | ||
| } | ||
| } | ||
| } |
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