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use crate::{Multiaddr, Transport, transport::{TransportError, ListenerEvent}};
use futures::{try_ready, Async, Future, Poll, Stream};
use log::debug;
use std::{error, fmt, time::Duration};
use wasm_timer::Timeout;
use wasm_timer::timeout::Error as TimeoutError;
#[derive(Debug, Copy, Clone)]
pub struct TransportTimeout<InnerTrans> {
inner: InnerTrans,
outgoing_timeout: Duration,
incoming_timeout: Duration,
}
impl<InnerTrans> TransportTimeout<InnerTrans> {
pub fn new(trans: InnerTrans, timeout: Duration) -> Self {
TransportTimeout {
inner: trans,
outgoing_timeout: timeout,
incoming_timeout: timeout,
}
}
pub fn with_outgoing_timeout(trans: InnerTrans, timeout: Duration) -> Self {
TransportTimeout {
inner: trans,
outgoing_timeout: timeout,
incoming_timeout: Duration::from_secs(100 * 365 * 24 * 3600),
}
}
pub fn with_ingoing_timeout(trans: InnerTrans, timeout: Duration) -> Self {
TransportTimeout {
inner: trans,
outgoing_timeout: Duration::from_secs(100 * 365 * 24 * 3600),
incoming_timeout: timeout,
}
}
}
impl<InnerTrans> Transport for TransportTimeout<InnerTrans>
where
InnerTrans: Transport,
InnerTrans::Error: 'static,
{
type Output = InnerTrans::Output;
type Error = TransportTimeoutError<InnerTrans::Error>;
type Listener = TimeoutListener<InnerTrans::Listener>;
type ListenerUpgrade = TokioTimerMapErr<Timeout<InnerTrans::ListenerUpgrade>>;
type Dial = TokioTimerMapErr<Timeout<InnerTrans::Dial>>;
fn listen_on(self, addr: Multiaddr) -> Result<Self::Listener, TransportError<Self::Error>> {
let listener = self.inner.listen_on(addr)
.map_err(|err| err.map(TransportTimeoutError::Other))?;
let listener = TimeoutListener {
inner: listener,
timeout: self.incoming_timeout,
};
Ok(listener)
}
fn dial(self, addr: Multiaddr) -> Result<Self::Dial, TransportError<Self::Error>> {
let dial = self.inner.dial(addr)
.map_err(|err| err.map(TransportTimeoutError::Other))?;
Ok(TokioTimerMapErr {
inner: Timeout::new(dial, self.outgoing_timeout),
})
}
}
pub struct TimeoutListener<InnerStream> {
inner: InnerStream,
timeout: Duration,
}
impl<InnerStream, O> Stream for TimeoutListener<InnerStream>
where
InnerStream: Stream<Item = ListenerEvent<O>>
{
type Item = ListenerEvent<TokioTimerMapErr<Timeout<O>>>;
type Error = TransportTimeoutError<InnerStream::Error>;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
let poll_out = try_ready!(self.inner.poll().map_err(TransportTimeoutError::Other));
if let Some(event) = poll_out {
let event = event.map(move |inner_fut| {
TokioTimerMapErr { inner: Timeout::new(inner_fut, self.timeout) }
});
Ok(Async::Ready(Some(event)))
} else {
Ok(Async::Ready(None))
}
}
}
#[must_use = "futures do nothing unless polled"]
pub struct TokioTimerMapErr<InnerFut> {
inner: InnerFut,
}
impl<InnerFut, TErr> Future for TokioTimerMapErr<InnerFut>
where
InnerFut: Future<Error = TimeoutError<TErr>>,
{
type Item = InnerFut::Item;
type Error = TransportTimeoutError<TErr>;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.inner.poll().map_err(|err: TimeoutError<TErr>| {
if err.is_inner() {
TransportTimeoutError::Other(err.into_inner().expect("ensured by is_inner()"))
} else if err.is_elapsed() {
debug!("timeout elapsed for connection");
TransportTimeoutError::Timeout
} else {
assert!(err.is_timer());
debug!("tokio timer error in timeout wrapper");
TransportTimeoutError::TimerError
}
})
}
}
#[derive(Debug, Copy, Clone)]
pub enum TransportTimeoutError<TErr> {
Timeout,
TimerError,
Other(TErr),
}
impl<TErr> fmt::Display for TransportTimeoutError<TErr>
where TErr: fmt::Display,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
TransportTimeoutError::Timeout => write!(f, "Timeout has been reached"),
TransportTimeoutError::TimerError => write!(f, "Error in the timer"),
TransportTimeoutError::Other(err) => write!(f, "{}", err),
}
}
}
impl<TErr> error::Error for TransportTimeoutError<TErr>
where TErr: error::Error + 'static,
{
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
TransportTimeoutError::Timeout => None,
TransportTimeoutError::TimerError => None,
TransportTimeoutError::Other(err) => Some(err),
}
}
}