lightws 0.6.14

Lightweight websocket implement for stream transmission.
Documentation 
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use std::io::Result;
use std::pin::Pin;
use std::task::{Poll, Context};

use tokio::io::AsyncRead;
use tokio::io::ReadBuf;

use super::{Stream, RoleHelper, Guarded};
use super::detail::read_some;

impl<IO, Role> AsyncRead for Stream<IO, Role>
where
    IO: AsyncRead + Unpin,
    Stream<IO, Role>: Unpin,
    Role: RoleHelper,
{
    /// Async version of `Stream::read`.
    #[rustfmt::skip]
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<Result<()>> {
        read_some(self.get_mut(), |io, buf| {
                let mut buf = ReadBuf::new(buf);
                Pin::new(io).poll_read(cx, &mut buf)
                .map_ok(|_| buf.filled().len())
            },
            buf.initialize_unfilled(),
        ).map_ok(|n| buf.advance(n))
    }
}

impl<IO, Role> AsyncRead for Stream<IO, Role, Guarded>
where
    IO: AsyncRead + Unpin,
    Stream<IO, Role, Guarded>: Unpin,
    Role: RoleHelper,
{
    /// Async version of `Stream::read`.
    /// Continue to read if frame head is not complete.
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<Result<()>> {
        let this = self.get_mut();

        loop {
            match read_some(
                this,
                |io, buf| {
                    let mut buf = ReadBuf::new(buf);
                    Pin::new(io)
                        .poll_read(cx, &mut buf)
                        .map_ok(|_| buf.filled().len())
                },
                buf.initialize_unfilled(),
            ) {
                Poll::Ready(Ok(0)) if this.is_read_partial_head() || !this.is_read_end() => {
                    continue
                }
                Poll::Ready(Ok(n)) => {
                    buf.advance(n);
                    return Poll::Ready(Ok(()));
                }
                Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
                Poll::Pending => return Poll::Pending,
            }
        }
    }
}