ntex 0.3.1

Framework for composable network services
Documentation 
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use std::{fmt, future::Future, io, net, pin::Pin, task::Context, task::Poll};

use crate::codec::{AsyncRead, AsyncWrite, Framed, ReadBuf};
use crate::http::body::Body;
use crate::http::h1::ClientCodec;
use crate::http::{RequestHeadType, ResponseHead};
use crate::Service;

use super::error::{ConnectError, SendRequestError};
use super::response::ClientResponse;
use super::{Connect as ClientConnect, Connection};

pub(super) struct ConnectorWrapper<T>(pub(crate) T);

pub(super) trait Connect {
    fn send_request(
        &self,
        head: RequestHeadType,
        body: Body,
        addr: Option<net::SocketAddr>,
    ) -> Pin<Box<dyn Future<Output = Result<ClientResponse, SendRequestError>>>>;

    /// Send request, returns Response and Framed
    fn open_tunnel(
        &self,
        head: RequestHeadType,
        addr: Option<net::SocketAddr>,
    ) -> Pin<
        Box<
            dyn Future<
                Output = Result<
                    (ResponseHead, Framed<BoxedSocket, ClientCodec>),
                    SendRequestError,
                >,
            >,
        >,
    >;
}

impl<T> Connect for ConnectorWrapper<T>
where
    T: Service<Request = ClientConnect, Error = ConnectError>,
    T::Response: Connection,
    <T::Response as Connection>::Io: 'static,
    <T::Response as Connection>::Future: 'static,
    <T::Response as Connection>::TunnelFuture: 'static,
    T::Future: 'static,
{
    fn send_request(
        &self,
        head: RequestHeadType,
        body: Body,
        addr: Option<net::SocketAddr>,
    ) -> Pin<Box<dyn Future<Output = Result<ClientResponse, SendRequestError>>>> {
        // connect to the host
        let fut = self.0.call(ClientConnect {
            uri: head.as_ref().uri.clone(),
            addr,
        });

        Box::pin(async move {
            let connection = fut.await?;

            // send request
            connection
                .send_request(head, body)
                .await
                .map(|(head, payload)| ClientResponse::new(head, payload))
        })
    }

    fn open_tunnel(
        &self,
        head: RequestHeadType,
        addr: Option<net::SocketAddr>,
    ) -> Pin<
        Box<
            dyn Future<
                Output = Result<
                    (ResponseHead, Framed<BoxedSocket, ClientCodec>),
                    SendRequestError,
                >,
            >,
        >,
    > {
        // connect to the host
        let fut = self.0.call(ClientConnect {
            uri: head.as_ref().uri.clone(),
            addr,
        });

        Box::pin(async move {
            let connection = fut.await?;

            // send request
            let (head, framed) = connection.open_tunnel(head).await?;

            let framed = framed.map_io(|io| BoxedSocket(Box::new(Socket(io))));
            Ok((head, framed))
        })
    }
}

trait AsyncSocket {
    fn as_read(&self) -> &(dyn AsyncRead + Unpin);
    fn as_read_mut(&mut self) -> &mut (dyn AsyncRead + Unpin);
    fn as_write(&mut self) -> &mut (dyn AsyncWrite + Unpin);
}

struct Socket<T: AsyncRead + AsyncWrite + Unpin>(T);

impl<T: AsyncRead + AsyncWrite + Unpin> AsyncSocket for Socket<T> {
    fn as_read(&self) -> &(dyn AsyncRead + Unpin) {
        &self.0
    }
    fn as_read_mut(&mut self) -> &mut (dyn AsyncRead + Unpin) {
        &mut self.0
    }
    fn as_write(&mut self) -> &mut (dyn AsyncWrite + Unpin) {
        &mut self.0
    }
}

pub struct BoxedSocket(Box<dyn AsyncSocket>);

impl fmt::Debug for BoxedSocket {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "BoxedSocket")
    }
}

impl AsyncRead for BoxedSocket {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut ReadBuf<'_>,
    ) -> Poll<io::Result<()>> {
        Pin::new(self.get_mut().0.as_read_mut()).poll_read(cx, buf)
    }
}

impl AsyncWrite for BoxedSocket {
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        Pin::new(self.get_mut().0.as_write()).poll_write(cx, buf)
    }

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

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