src/backup/index.rs: switch to async
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
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32bef1e2d1
commit
745e652a7f
@ -1,4 +1,6 @@
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use std::collections::HashMap;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use bytes::{Bytes, BytesMut};
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use failure::*;
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@ -93,55 +95,61 @@ impl std::io::Read for DigestListEncoder {
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///
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/// The reader simply returns a birary stream of 32 byte digest values.
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pub struct DigestListDecoder<S> {
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pub struct DigestListDecoder<S: Unpin> {
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input: S,
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buffer: BytesMut,
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}
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impl <S> DigestListDecoder<S> {
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impl<S: Unpin> DigestListDecoder<S> {
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pub fn new(input: S) -> Self {
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Self { input, buffer: BytesMut::new() }
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}
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}
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impl <S> Stream for DigestListDecoder<S>
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where S: Stream<Item=Bytes>,
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S::Error: Into<Error>,
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impl<S: Unpin> Unpin for DigestListDecoder<S> {}
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impl<S: Unpin, E> Stream for DigestListDecoder<S>
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where
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S: Stream<Item=Result<Bytes, E>>,
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E: Into<Error>,
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{
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type Item = [u8; 32];
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type Error = Error;
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type Item = Result<[u8; 32], Error>;
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fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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let this = self.get_mut();
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fn poll(&mut self) -> Result<Async<Option<Self::Item>>, Self::Error> {
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loop {
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if self.buffer.len() >= 32 {
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let left = self.buffer.split_to(32);
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if this.buffer.len() >= 32 {
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let left = this.buffer.split_to(32);
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let mut digest = std::mem::MaybeUninit::<[u8; 32]>::uninit();
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unsafe {
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(*digest.as_mut_ptr()).copy_from_slice(&left[..]);
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return Ok(Async::Ready(Some(digest.assume_init())));
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return Poll::Ready(Some(Ok(digest.assume_init())));
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}
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}
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match self.input.poll() {
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Err(err) => {
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return Err(err.into());
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match Pin::new(&mut this.input).poll_next(cx) {
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Poll::Pending => {
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return Poll::Pending;
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}
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Ok(Async::NotReady) => {
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return Ok(Async::NotReady);
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Poll::Ready(Some(Err(err))) => {
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return Poll::Ready(Some(Err(err.into())));
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}
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Ok(Async::Ready(None)) => {
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let rest = self.buffer.len();
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if rest == 0 { return Ok(Async::Ready(None)); }
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return Err(format_err!("got small digest ({} != 32).", rest));
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}
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Ok(Async::Ready(Some(data))) => {
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self.buffer.extend_from_slice(&data);
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Poll::Ready(Some(Ok(data))) => {
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this.buffer.extend_from_slice(&data);
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// continue
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}
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Poll::Ready(None) => {
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let rest = this.buffer.len();
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if rest == 0 {
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return Poll::Ready(None);
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}
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return Poll::Ready(Some(Err(format_err!(
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"got small digest ({} != 32).",
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rest,
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))));
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}
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}
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}
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}
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