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use crate::transport::Transport;
use futures_lite::io::{AsyncRead, AsyncWrite};
use std::any::Any;
use std::fmt::Debug;
use std::ops::Deref;
use std::{
fmt,
io::Result,
pin::Pin,
task::{Context, Poll},
};
pub struct BoxedTransport(Box<dyn Transport + Send + Sync + 'static>);
impl Debug for BoxedTransport {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("BoxedTransport")
.field(
"inner",
&"Box<dyn AsyncRead + AsyncWrite + Send + Sync + Unpin>",
)
.finish()
}
}
impl BoxedTransport {
pub fn new(t: impl Transport + 'static) -> Self {
Self(Box::new(t))
}
#[must_use = "downcasting takes the inner transport, so you should use it"]
pub fn downcast<T: 'static>(self) -> Option<Box<T>> {
let inner: Box<dyn Any> = self.0.as_box_any();
inner.downcast().ok()
}
}
impl Deref for BoxedTransport {
type Target = Box<dyn Transport + Send + Sync + 'static>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl AsyncRead for BoxedTransport {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<Result<usize>> {
Pin::new(&mut self.0).poll_read(cx, buf)
}
}
impl AsyncWrite for BoxedTransport {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize>> {
Pin::new(&mut self.0).poll_write(cx, buf)
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
Pin::new(&mut self.0).poll_flush(cx)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
Pin::new(&mut self.0).poll_close(cx)
}
}