mirror of https://github.com/http-rs/async-h1
66 lines
1.7 KiB
Rust
66 lines
1.7 KiB
Rust
use std::fmt;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use async_channel::Sender;
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use futures_lite::io::{self, AsyncBufRead as BufRead, AsyncRead as Read};
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/// ReadNotifier forwards [`async_std::io::Read`] and
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/// [`async_std::io::BufRead`] to an inner reader. When the
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/// ReadNotifier is read from (using `Read`, `ReadExt`, or `BufRead`
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/// methods), it sends a single message containing `()` on the
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/// channel.
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#[pin_project::pin_project]
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pub(crate) struct ReadNotifier<B> {
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#[pin]
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reader: B,
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sender: Sender<()>,
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has_been_read: bool,
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}
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impl<B> fmt::Debug for ReadNotifier<B> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("ReadNotifier")
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.field("read", &self.has_been_read)
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.finish()
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}
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}
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impl<B: Read> ReadNotifier<B> {
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pub(crate) fn new(reader: B, sender: Sender<()>) -> Self {
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Self {
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reader,
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sender,
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has_been_read: false,
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}
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}
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}
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impl<B: BufRead> BufRead for ReadNotifier<B> {
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fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
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self.project().reader.poll_fill_buf(cx)
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}
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fn consume(self: Pin<&mut Self>, amt: usize) {
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self.project().reader.consume(amt)
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}
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}
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impl<B: Read> Read for ReadNotifier<B> {
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fn poll_read(
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self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut [u8],
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) -> Poll<io::Result<usize>> {
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let this = self.project();
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if !*this.has_been_read {
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if let Ok(()) = this.sender.try_send(()) {
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*this.has_been_read = true;
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};
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}
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this.reader.poll_read(cx, buf)
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}
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}
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