proxyapi 0.4.3

Core library for the Proxelar MITM proxy
Documentation 
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use bytes::{Buf, Bytes};
use std::{
    cmp, io,
    pin::Pin,
    task::{self, Poll},
};
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};

/// A stream wrapper that prepends buffered bytes before delegating to the inner stream.
pub(crate) struct Rewind<T> {
    pre: Option<Bytes>,
    inner: T,
}

impl<T> Rewind<T> {
    pub(crate) const fn new_buffered(io: T, buf: Bytes) -> Self {
        Self {
            pre: Some(buf),
            inner: io,
        }
    }
}

impl<T> AsyncRead for Rewind<T>
where
    T: AsyncRead + Unpin,
{
    fn poll_read(
        mut self: Pin<&mut Self>,
        cx: &mut task::Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        if let Some(mut prefix) = self.pre.take() {
            if !prefix.is_empty() {
                let copy_len = cmp::min(prefix.len(), buf.remaining());
                buf.put_slice(&prefix[..copy_len]);
                prefix.advance(copy_len);
                if !prefix.is_empty() {
                    self.pre = Some(prefix);
                }

                return Poll::Ready(Ok(()));
            }
        }
        Pin::new(&mut self.inner).poll_read(cx, buf)
    }
}

impl<T> AsyncWrite for Rewind<T>
where
    T: AsyncWrite + Unpin,
{
    fn poll_write(
        mut self: Pin<&mut Self>,
        cx: &mut task::Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        Pin::new(&mut self.inner).poll_write(cx, buf)
    }

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

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

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

    fn is_write_vectored(&self) -> bool {
        self.inner.is_write_vectored()
    }
}