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use futures::prelude::*;
use std::{
io,
marker::PhantomData,
net::SocketAddr,
pin::Pin,
task::{Context, Poll},
};
pub mod channel;
pub trait Transport
where
Self: Stream<Item = io::Result<<Self as Transport>::Item>>,
Self: Sink<<Self as Transport>::SinkItem, SinkError = io::Error>,
{
type Item;
type SinkItem;
fn peer_addr(&self) -> io::Result<SocketAddr>;
fn local_addr(&self) -> io::Result<SocketAddr>;
}
pub fn new<S, SinkItem, Item>(
inner: S,
peer_addr: SocketAddr,
local_addr: SocketAddr,
) -> impl Transport<Item = Item, SinkItem = SinkItem>
where
S: Stream<Item = io::Result<Item>>,
S: Sink<SinkItem, SinkError = io::Error>,
{
TransportShim {
inner,
peer_addr,
local_addr,
_marker: PhantomData,
}
}
#[derive(Debug)]
struct TransportShim<S, SinkItem> {
peer_addr: SocketAddr,
local_addr: SocketAddr,
inner: S,
_marker: PhantomData<SinkItem>,
}
impl<S, SinkItem> TransportShim<S, SinkItem> {
pin_utils::unsafe_pinned!(inner: S);
}
impl<S, SinkItem> Stream for TransportShim<S, SinkItem>
where
S: Stream,
{
type Item = S::Item;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<S::Item>> {
self.inner().poll_next(cx)
}
}
impl<S, Item> Sink<Item> for TransportShim<S, Item>
where
S: Sink<Item>,
{
type SinkError = S::SinkError;
fn start_send(self: Pin<&mut Self>, item: Item) -> Result<(), S::SinkError> {
self.inner().start_send(item)
}
fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), S::SinkError>> {
self.inner().poll_ready(cx)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), S::SinkError>> {
self.inner().poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), S::SinkError>> {
self.inner().poll_close(cx)
}
}
impl<S, SinkItem, Item> Transport for TransportShim<S, SinkItem>
where
S: Stream + Sink<SinkItem>,
Self: Stream<Item = io::Result<Item>>,
Self: Sink<SinkItem, SinkError = io::Error>,
{
type Item = Item;
type SinkItem = SinkItem;
fn peer_addr(&self) -> io::Result<SocketAddr> {
Ok(self.peer_addr)
}
fn local_addr(&self) -> io::Result<SocketAddr> {
Ok(self.local_addr)
}
}