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use crate::transport::{ConnectionInfo, IListener, ITransport, ListenerEvent};
use crate::{
transport::{TransportError, TransportListener},
Multiaddr, Transport,
};
use async_trait::async_trait;
use futures::task::{Context, Poll};
use futures::{AsyncRead, AsyncWrite};
use libp2p_pnet::{PnetConfig, PnetOutput};
use std::{io, pin::Pin};
#[pin_project::pin_project]
pub struct PnetStream<T> {
#[pin]
io: PnetOutput<T>,
la: Multiaddr,
ra: Multiaddr,
}
impl<T: AsyncRead + AsyncWrite + Send + Unpin + 'static> AsyncRead for PnetStream<T> {
fn poll_read(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<io::Result<usize>> {
self.project().io.poll_read(cx, buf)
}
}
impl<T: AsyncRead + AsyncWrite + Send + Unpin + 'static> AsyncWrite for PnetStream<T> {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<io::Result<usize>> {
self.project().io.poll_write(cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
self.project().io.poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
self.project().io.poll_close(cx)
}
}
impl<T: Send> ConnectionInfo for PnetStream<T> {
fn local_multiaddr(&self) -> Multiaddr {
self.la.clone()
}
fn remote_multiaddr(&self) -> Multiaddr {
self.ra.clone()
}
}
#[derive(Debug, Clone)]
pub struct ProtectorTransport<InnerTrans> {
inner: InnerTrans,
pnet: PnetConfig,
}
#[allow(dead_code)]
impl<InnerTrans> ProtectorTransport<InnerTrans> {
pub fn new(inner: InnerTrans, pnet: PnetConfig) -> Self {
Self { inner, pnet }
}
}
#[async_trait]
impl<InnerTrans> Transport for ProtectorTransport<InnerTrans>
where
InnerTrans: Transport + Clone + 'static,
InnerTrans::Output: ConnectionInfo + AsyncRead + AsyncWrite + Send + Unpin + 'static,
{
type Output = PnetStream<InnerTrans::Output>;
fn listen_on(&mut self, addr: Multiaddr) -> Result<IListener<Self::Output>, TransportError> {
let inner_listener = self.inner.listen_on(addr)?;
let listener = ProtectorListener::new(inner_listener, self.pnet);
Ok(Box::new(listener))
}
async fn dial(&mut self, addr: Multiaddr) -> Result<Self::Output, TransportError> {
let socket = self.inner.dial(addr).await?;
let la = socket.local_multiaddr();
let ra = socket.remote_multiaddr();
self.pnet
.handshake(socket)
.await
.map(|io| PnetStream { io, la, ra })
.map_err(|e| e.into())
}
fn box_clone(&self) -> ITransport<Self::Output> {
Box::new(self.clone())
}
fn protocols(&self) -> Vec<u32> {
self.inner.protocols()
}
}
pub struct ProtectorListener<TOutput> {
inner: IListener<TOutput>,
pnet: PnetConfig,
}
impl<TOutput> ProtectorListener<TOutput> {
pub(crate) fn new(inner: IListener<TOutput>, pnet: PnetConfig) -> Self {
Self { inner, pnet }
}
}
#[async_trait]
impl<TOutput> TransportListener for ProtectorListener<TOutput>
where
TOutput: ConnectionInfo + AsyncRead + AsyncWrite + Send + Unpin + 'static,
{
type Output = PnetStream<TOutput>;
async fn accept(&mut self) -> Result<ListenerEvent<Self::Output>, TransportError> {
let e = self.inner.accept().await?;
match e {
ListenerEvent::Accepted(o) => {
let la = o.local_multiaddr();
let ra = o.remote_multiaddr();
self.pnet
.clone()
.handshake(o)
.await
.map(|io| ListenerEvent::Accepted(PnetStream { io, la, ra }))
.map_err(|e| e.into())
}
ListenerEvent::AddressAdded(a) => Ok(ListenerEvent::AddressAdded(a)),
ListenerEvent::AddressDeleted(a) => Ok(ListenerEvent::AddressDeleted(a)),
}
}
fn multi_addr(&self) -> Option<&Multiaddr> {
self.inner.multi_addr()
}
}