71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
// Implement simple flow control for h2 client
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//
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// See also: hyper/src/proto/h2/mod.rs
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use bytes::Bytes;
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use failure::*;
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use futures::{ready, Future};
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use h2::SendStream;
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pub struct PipeToSendStream {
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body_tx: SendStream<Bytes>,
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data: Option<Bytes>,
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}
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impl PipeToSendStream {
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pub fn new(data: Bytes, tx: SendStream<Bytes>) -> PipeToSendStream {
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PipeToSendStream {
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body_tx: tx,
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data: Some(data),
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}
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}
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}
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impl Future for PipeToSendStream {
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type Output = Result<(), Error>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
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let this = self.get_mut();
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if this.data != None {
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// just reserve 1 byte to make sure there's some
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// capacity available. h2 will handle the capacity
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// management for the actual body chunk.
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this.body_tx.reserve_capacity(1);
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if this.body_tx.capacity() == 0 {
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loop {
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match ready!(this.body_tx.poll_capacity(cx)) {
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Some(Err(err)) => return Poll::Ready(Err(Error::from(err))),
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Some(Ok(0)) => {}
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Some(Ok(_)) => break,
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None => return Poll::Ready(Err(format_err!("protocol canceled"))),
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}
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}
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} else if let Poll::Ready(reset) = this.body_tx.poll_reset(cx) {
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return Poll::Ready(Err(match reset {
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Ok(reason) => format_err!("stream received RST_STREAM: {:?}", reason),
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Err(err) => Error::from(err),
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}));
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}
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this.body_tx
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.send_data(this.data.take().unwrap(), true)
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.map_err(Error::from)?;
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Poll::Ready(Ok(()))
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} else {
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if let Poll::Ready(reset) = this.body_tx.poll_reset(cx) {
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return Poll::Ready(Err(match reset {
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Ok(reason) => format_err!("stream received RST_STREAM: {:?}", reason),
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Err(err) => Error::from(err),
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}));
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}
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Poll::Ready(Ok(()))
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}
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}
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}
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