amunra commented on issue #7003:
URL: https://github.com/apache/opendal/issues/7003#issuecomment-3657760643
I'm not sure I'll be able to find cycles for an actual fix any time soon.
That said, this seems to work in our code base now:
```rust
pub struct AsyncReader {
stream: opendal::BufferStream,
current: opendal::Buffer,
eof: bool,
}
impl AsyncReader {
pub fn new(stream: opendal::BufferStream) -> Self {
Self {
stream,
current: opendal::Buffer::new(),
eof: false,
}
}
}
impl AsyncRead for AsyncReader {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut std::task::Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
if self.eof {
return Poll::Ready(Ok(0));
}
loop {
match Read::read(&mut self.current, buf) {
Ok(read) if read > 0 => return Poll::Ready(Ok(read)),
Ok(_) => (), // fetch next buffer
Err(err) => {
self.eof = true;
return Poll::Ready(Err(err));
}
};
let stream = Pin::new(&mut self.stream);
match futures::stream::Stream::poll_next(stream, cx) {
Poll::Ready(Some(Ok(buf))) => {
self.current = buf;
}
Poll::Ready(Some(Err(err))) => {
self.eof = true;
let io_err: io::Error = err.into();
return Poll::Ready(Err(io_err));
}
Poll::Ready(None) => {
self.eof = true;
return Poll::Ready(Ok(0));
}
Poll::Pending => return Poll::Pending,
}
}
}
}
```
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