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use futures::{prelude::*, future, try_ready};
use libp2p_core::{InboundUpgrade, OutboundUpgrade, UpgradeInfo, upgrade::Negotiated};
use log::debug;
use rand::{distributions, prelude::*};
use std::{io, iter, time::Duration};
use tokio_io::{io as nio, AsyncRead, AsyncWrite};
use wasm_timer::Instant;
#[derive(Default, Debug, Copy, Clone)]
pub struct Ping;
impl UpgradeInfo for Ping {
type Info = &'static [u8];
type InfoIter = iter::Once<Self::Info>;
fn protocol_info(&self) -> Self::InfoIter {
iter::once(b"/ipfs/ping/1.0.0")
}
}
type RecvPing<T> = nio::ReadExact<Negotiated<T>, [u8; 32]>;
type SendPong<T> = nio::WriteAll<Negotiated<T>, [u8; 32]>;
type Flush<T> = nio::Flush<Negotiated<T>>;
type Shutdown<T> = nio::Shutdown<Negotiated<T>>;
impl<TSocket> InboundUpgrade<TSocket> for Ping
where
TSocket: AsyncRead + AsyncWrite,
{
type Output = ();
type Error = io::Error;
type Future = future::Map<
future::AndThen<
future::AndThen<
future::AndThen<
RecvPing<TSocket>,
SendPong<TSocket>, fn((Negotiated<TSocket>, [u8; 32])) -> SendPong<TSocket>>,
Flush<TSocket>, fn((Negotiated<TSocket>, [u8; 32])) -> Flush<TSocket>>,
Shutdown<TSocket>, fn(Negotiated<TSocket>) -> Shutdown<TSocket>>,
fn(Negotiated<TSocket>) -> ()>;
#[inline]
fn upgrade_inbound(self, socket: Negotiated<TSocket>, _: Self::Info) -> Self::Future {
nio::read_exact(socket, [0; 32])
.and_then::<fn(_) -> _, _>(|(sock, buf)| nio::write_all(sock, buf))
.and_then::<fn(_) -> _, _>(|(sock, _)| nio::flush(sock))
.and_then::<fn(_) -> _, _>(|sock| nio::shutdown(sock))
.map(|_| ())
}
}
impl<TSocket> OutboundUpgrade<TSocket> for Ping
where
TSocket: AsyncRead + AsyncWrite,
{
type Output = Duration;
type Error = io::Error;
type Future = PingDialer<Negotiated<TSocket>>;
#[inline]
fn upgrade_outbound(self, socket: Negotiated<TSocket>, _: Self::Info) -> Self::Future {
let payload: [u8; 32] = thread_rng().sample(distributions::Standard);
debug!("Preparing ping payload {:?}", payload);
PingDialer {
state: PingDialerState::Write {
inner: nio::write_all(socket, payload),
},
}
}
}
pub struct PingDialer<TSocket> {
state: PingDialerState<TSocket>
}
enum PingDialerState<TSocket> {
Write {
inner: nio::WriteAll<TSocket, [u8; 32]>,
},
Flush {
inner: nio::Flush<TSocket>,
payload: [u8; 32],
},
Read {
inner: nio::ReadExact<TSocket, [u8; 32]>,
payload: [u8; 32],
started: Instant,
},
Shutdown {
inner: nio::Shutdown<TSocket>,
rtt: Duration,
},
}
impl<TSocket> Future for PingDialer<TSocket>
where
TSocket: AsyncRead + AsyncWrite,
{
type Item = Duration;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
loop {
self.state = match self.state {
PingDialerState::Write { ref mut inner } => {
let (socket, payload) = try_ready!(inner.poll());
PingDialerState::Flush {
inner: nio::flush(socket),
payload,
}
},
PingDialerState::Flush { ref mut inner, payload } => {
let socket = try_ready!(inner.poll());
let started = Instant::now();
PingDialerState::Read {
inner: nio::read_exact(socket, [0; 32]),
payload,
started,
}
},
PingDialerState::Read { ref mut inner, payload, started } => {
let (socket, payload_received) = try_ready!(inner.poll());
let rtt = started.elapsed();
if payload_received != payload {
return Err(io::Error::new(
io::ErrorKind::InvalidData, "Ping payload mismatch"));
}
PingDialerState::Shutdown {
inner: nio::shutdown(socket),
rtt,
}
},
PingDialerState::Shutdown { ref mut inner, rtt } => {
try_ready!(inner.poll());
return Ok(Async::Ready(rtt));
},
}
}
}
}
#[cfg(test)]
mod tests {
use super::Ping;
use futures::prelude::*;
use libp2p_core::{
upgrade,
multiaddr::multiaddr,
transport::{
Transport,
ListenerEvent,
memory::MemoryTransport
}
};
use rand::{thread_rng, Rng};
use std::time::Duration;
#[test]
fn ping_pong() {
let mem_addr = multiaddr![Memory(thread_rng().gen::<u64>())];
let mut listener = MemoryTransport.listen_on(mem_addr).unwrap();
let listener_addr =
if let Ok(Async::Ready(Some(ListenerEvent::NewAddress(a)))) = listener.poll() {
a
} else {
panic!("MemoryTransport not listening on an address!");
};
let server = listener
.into_future()
.map_err(|(e, _)| e)
.and_then(|(listener_event, _)| {
let (listener_upgrade, _) = listener_event.unwrap().into_upgrade().unwrap();
let conn = listener_upgrade.wait().unwrap();
upgrade::apply_inbound(conn, Ping::default())
.map_err(|e| panic!(e))
});
let client = MemoryTransport.dial(listener_addr).unwrap()
.and_then(|c| {
upgrade::apply_outbound(c, Ping::default())
.map_err(|e| panic!(e))
});
let mut runtime = tokio::runtime::Runtime::new().unwrap();
runtime.spawn(server.map_err(|e| panic!(e)));
let rtt = runtime.block_on(client).expect("RTT");
assert!(rtt > Duration::from_secs(0));
}
}