rups 0.6.1

Network UPS Tools (NUT) client library
Documentation 
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use std::io::Error;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
use tokio::net::TcpStream;

/// A wrapper for various Tokio stream types.
pub enum ConnectionStream {
    /// A plain TCP stream.
    Plain(TcpStream),

    /// A stream wrapped with SSL using `rustls`.
    #[cfg(feature = "async-ssl")]
    Ssl(Box<tokio_rustls::client::TlsStream<ConnectionStream>>),
}

impl ConnectionStream {
    /// Wraps the current stream with SSL using `rustls`.
    #[cfg(feature = "async-ssl")]
    pub async fn upgrade_ssl(
        self,
        config: tokio_rustls::TlsConnector,
        dns_name: webpki::DNSNameRef<'_>,
    ) -> crate::Result<ConnectionStream> {
        Ok(ConnectionStream::Ssl(Box::new(
            config
                .connect(dns_name, self)
                .await
                .map_err(crate::ClientError::Io)?,
        )))
    }
}

impl AsyncRead for ConnectionStream {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<std::io::Result<()>> {
        match self.get_mut() {
            Self::Plain(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_read(cx, buf)
            }
            #[cfg(feature = "async-ssl")]
            Self::Ssl(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_read(cx, buf)
            }
        }
    }
}

impl AsyncWrite for ConnectionStream {
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<Result<usize, Error>> {
        match self.get_mut() {
            Self::Plain(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_write(cx, buf)
            }
            #[cfg(feature = "async-ssl")]
            Self::Ssl(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_write(cx, buf)
            }
        }
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Error>> {
        match self.get_mut() {
            Self::Plain(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_flush(cx)
            }
            #[cfg(feature = "async-ssl")]
            Self::Ssl(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_flush(cx)
            }
        }
    }

    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Error>> {
        match self.get_mut() {
            Self::Plain(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_shutdown(cx)
            }
            #[cfg(feature = "async-ssl")]
            Self::Ssl(stream) => {
                let pinned = Pin::new(stream);
                pinned.poll_shutdown(cx)
            }
        }
    }
}