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use crate::transport::{ListenerEvent, Transport, TransportError};
use futures::prelude::*;
use multiaddr::Multiaddr;
use std::{error::Error, fmt, io, pin::Pin, sync::Arc};
pub fn boxed<T>(transport: T) -> Boxed<T::Output>
where
T: Transport + Clone + Send + Sync + 'static,
T::Error: Send + Sync,
T::Dial: Send + 'static,
T::Listener: Send + 'static,
T::ListenerUpgrade: Send + 'static,
{
Boxed {
inner: Arc::new(transport) as Arc<_>,
}
}
pub struct Boxed<O> {
inner: Arc<dyn Abstract<O> + Send + Sync>,
}
type Dial<O> = Pin<Box<dyn Future<Output = io::Result<O>> + Send>>;
type Listener<O> =
Pin<Box<dyn Stream<Item = io::Result<ListenerEvent<ListenerUpgrade<O>, io::Error>>> + Send>>;
type ListenerUpgrade<O> = Pin<Box<dyn Future<Output = io::Result<O>> + Send>>;
trait Abstract<O> {
fn listen_on(&self, addr: Multiaddr) -> Result<Listener<O>, TransportError<io::Error>>;
fn dial(&self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>>;
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr>;
}
impl<T, O> Abstract<O> for T
where
T: Transport<Output = O> + Clone + 'static,
T::Error: Send + Sync,
T::Dial: Send + 'static,
T::Listener: Send + 'static,
T::ListenerUpgrade: Send + 'static,
{
fn listen_on(&self, addr: Multiaddr) -> Result<Listener<O>, TransportError<io::Error>> {
let listener = Transport::listen_on(self.clone(), addr).map_err(|e| e.map(box_err))?;
let fut = listener
.map_ok(|event| {
event
.map(|upgrade| {
let up = upgrade.map_err(box_err);
Box::pin(up) as ListenerUpgrade<O>
})
.map_err(box_err)
})
.map_err(box_err);
Ok(Box::pin(fut))
}
fn dial(&self, addr: Multiaddr) -> Result<Dial<O>, TransportError<io::Error>> {
let fut = Transport::dial(self.clone(), addr)
.map(|r| r.map_err(box_err))
.map_err(|e| e.map(box_err))?;
Ok(Box::pin(fut) as Dial<_>)
}
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
Transport::address_translation(self, server, observed)
}
}
impl<O> fmt::Debug for Boxed<O> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "BoxedTransport")
}
}
impl<O> Clone for Boxed<O> {
fn clone(&self) -> Self {
Boxed {
inner: self.inner.clone(),
}
}
}
impl<O> Transport for Boxed<O> {
type Output = O;
type Error = io::Error;
type Listener = Listener<O>;
type ListenerUpgrade = ListenerUpgrade<O>;
type Dial = Dial<O>;
fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
self.inner.listen_on(addr)
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
self.inner.dial(addr)
}
fn address_translation(&self, server: &Multiaddr, observed: &Multiaddr) -> Option<Multiaddr> {
self.inner.address_translation(server, observed)
}
}
fn box_err<E: Error + Send + Sync + 'static>(e: E) -> io::Error {
io::Error::new(io::ErrorKind::Other, e)
}