watermelon-mini 0.3.4

Minimal NATS Core client implementation
Documentation 
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use std::{
    io,
    pin::Pin,
    task::{Context, Poll},
};

use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};

#[derive(Debug)]
pub(crate) struct MaybeConnection<S>(pub(crate) Option<S>);

impl<S> AsyncRead for MaybeConnection<S>
where
    S: AsyncRead + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        Pin::new(self.0.as_mut().unwrap()).poll_read(cx, buf)
    }
}

impl<S> AsyncWrite for MaybeConnection<S>
where
    S: AsyncWrite + Unpin,
{
    fn poll_write(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        Pin::new(self.0.as_mut().unwrap()).poll_write(cx, buf)
    }

    fn poll_write_vectored(
        mut self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &[io::IoSlice<'_>],
    ) -> Poll<io::Result<usize>> {
        Pin::new(self.0.as_mut().unwrap()).poll_write_vectored(cx, bufs)
    }

    fn is_write_vectored(&self) -> bool {
        self.0.as_ref().unwrap().is_write_vectored()
    }

    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(self.0.as_mut().unwrap()).poll_flush(cx)
    }

    fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(self.0.as_mut().unwrap()).poll_shutdown(cx)
    }
}