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use futures_lite::{AsyncRead, AsyncWrite, Stream};
use std::{
convert::{TryFrom, TryInto},
io::Result,
pin::Pin,
task::{Context, Poll},
};
#[derive(Debug)]
pub enum Binding<T, U> {
Tcp(T),
Unix(U),
}
impl<T: TryFrom<std::net::TcpListener>, U> TryFrom<std::net::TcpListener> for Binding<T, U> {
type Error = <T as TryFrom<std::net::TcpListener>>::Error;
fn try_from(value: std::net::TcpListener) -> std::result::Result<Self, Self::Error> {
Ok(Self::Tcp(value.try_into()?))
}
}
#[cfg(unix)]
impl<T, U: TryFrom<std::os::unix::net::UnixListener>> TryFrom<std::os::unix::net::UnixListener>
for Binding<T, U>
{
type Error = <U as TryFrom<std::os::unix::net::UnixListener>>::Error;
fn try_from(value: std::os::unix::net::UnixListener) -> std::result::Result<Self, Self::Error> {
Ok(Self::Unix(value.try_into()?))
}
}
impl<T, U, TI, UI> Stream for Binding<T, U>
where
T: Stream<Item = Result<TI>> + Unpin,
U: Stream<Item = Result<UI>> + Unpin,
{
type Item = Result<Binding<TI, UI>>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
match &mut *self {
Binding::Tcp(t) => Pin::new(t)
.poll_next(cx)
.map(|i| i.map(|x| x.map(Binding::Tcp))),
Binding::Unix(u) => Pin::new(u)
.poll_next(cx)
.map(|i| i.map(|x| x.map(Binding::Unix))),
}
}
}
impl<T, U> AsyncRead for Binding<T, U>
where
T: AsyncRead + Unpin,
U: AsyncRead + Unpin,
{
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<Result<usize>> {
match &mut *self {
Binding::Tcp(t) => Pin::new(t).poll_read(cx, buf),
Binding::Unix(u) => Pin::new(u).poll_read(cx, buf),
}
}
}
impl<T, U> AsyncWrite for Binding<T, U>
where
T: AsyncWrite + Unpin,
U: AsyncWrite + Unpin,
{
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize>> {
match &mut *self {
Binding::Tcp(t) => Pin::new(t).poll_write(cx, buf),
Binding::Unix(u) => Pin::new(u).poll_write(cx, buf),
}
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
match &mut *self {
Binding::Tcp(t) => Pin::new(t).poll_flush(cx),
Binding::Unix(u) => Pin::new(u).poll_flush(cx),
}
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
match &mut *self {
Binding::Tcp(t) => Pin::new(t).poll_close(cx),
Binding::Unix(u) => Pin::new(u).poll_close(cx),
}
}
}