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use futures::{future::BoxFuture, prelude::*};
use libp2p_core::{InboundUpgrade, OutboundUpgrade, UpgradeInfo};
use log::debug;
use rand::{distributions, prelude::*};
use std::{io, iter, time::Duration};
use wasm_timer::Instant;
#[derive(Default, Debug, Copy, Clone)]
pub struct Ping;
const PING_SIZE: usize = 32;
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")
}
}
impl<TSocket> InboundUpgrade<TSocket> for Ping
where
TSocket: AsyncRead + AsyncWrite + Send + Unpin + 'static,
{
type Output = ();
type Error = io::Error;
type Future = BoxFuture<'static, Result<(), io::Error>>;
fn upgrade_inbound(self, mut socket: TSocket, _: Self::Info) -> Self::Future {
async move {
let mut payload = [0u8; PING_SIZE];
while let Ok(_) = socket.read_exact(&mut payload).await {
socket.write_all(&payload).await?;
}
Ok(())
}.boxed()
}
}
impl<TSocket> OutboundUpgrade<TSocket> for Ping
where
TSocket: AsyncRead + AsyncWrite + Send + Unpin + 'static,
{
type Output = Duration;
type Error = io::Error;
type Future = BoxFuture<'static, Result<Duration, io::Error>>;
fn upgrade_outbound(self, mut socket: TSocket, _: Self::Info) -> Self::Future {
let payload: [u8; 32] = thread_rng().sample(distributions::Standard);
debug!("Preparing ping payload {:?}", payload);
async move {
socket.write_all(&payload).await?;
socket.close().await?;
let started = Instant::now();
let mut recv_payload = [0u8; 32];
socket.read_exact(&mut recv_payload).await?;
if recv_payload == payload {
Ok(started.elapsed())
} else {
Err(io::Error::new(io::ErrorKind::InvalidData, "Ping payload mismatch"))
}
}.boxed()
}
}
#[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 Some(Some(Ok(ListenerEvent::NewAddress(a)))) = listener.next().now_or_never() {
a
} else {
panic!("MemoryTransport not listening on an address!");
};
async_std::task::spawn(async move {
let listener_event = listener.next().await.unwrap();
let (listener_upgrade, _) = listener_event.unwrap().into_upgrade().unwrap();
let conn = listener_upgrade.await.unwrap();
upgrade::apply_inbound(conn, Ping::default()).await.unwrap();
});
async_std::task::block_on(async move {
let c = MemoryTransport.dial(listener_addr).unwrap().await.unwrap();
let rtt = upgrade::apply_outbound(c, Ping::default(), upgrade::Version::V1).await.unwrap();
assert!(rtt > Duration::from_secs(0));
});
}
}