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|
use std::{sync::Arc, time::Duration};
use async_trait::async_trait;
use bincode::{Decode, Encode};
use log::trace;
use rand::{rngs::OsRng, RngCore};
use smol::{
channel,
channel::{Receiver, Sender},
stream::StreamExt,
Timer,
};
use karyon_core::{
async_util::{select, timeout, Either, TaskGroup, TaskResult},
event::EventListener,
util::decode,
GlobalExecutor,
};
use karyon_net::NetError;
use crate::{
peer::ArcPeer,
protocol::{ArcProtocol, Protocol, ProtocolEvent, ProtocolID},
version::Version,
Result,
};
const MAX_FAILUERS: u32 = 3;
#[derive(Clone, Debug, Encode, Decode)]
enum PingProtocolMsg {
Ping([u8; 32]),
Pong([u8; 32]),
}
pub struct PingProtocol {
peer: ArcPeer,
ping_interval: u64,
ping_timeout: u64,
task_group: TaskGroup<'static>,
}
impl PingProtocol {
#[allow(clippy::new_ret_no_self)]
pub fn new(peer: ArcPeer, executor: GlobalExecutor) -> ArcProtocol {
let ping_interval = peer.config().ping_interval;
let ping_timeout = peer.config().ping_timeout;
Arc::new(Self {
peer,
ping_interval,
ping_timeout,
task_group: TaskGroup::new(executor),
})
}
async fn recv_loop(
&self,
listener: &EventListener<ProtocolID, ProtocolEvent>,
pong_chan: Sender<[u8; 32]>,
) -> Result<()> {
loop {
let event = listener.recv().await?;
let msg_payload = match event.clone() {
ProtocolEvent::Message(m) => m,
ProtocolEvent::Shutdown => {
break;
}
};
let (msg, _) = decode::<PingProtocolMsg>(&msg_payload)?;
match msg {
PingProtocolMsg::Ping(nonce) => {
trace!("Received Ping message {:?}", nonce);
self.peer
.send(&Self::id(), &PingProtocolMsg::Pong(nonce))
.await?;
trace!("Send back Pong message {:?}", nonce);
}
PingProtocolMsg::Pong(nonce) => {
pong_chan.send(nonce).await?;
}
}
}
Ok(())
}
async fn ping_loop(self: Arc<Self>, chan: Receiver<[u8; 32]>) -> Result<()> {
let mut timer = Timer::interval(Duration::from_secs(self.ping_interval));
let rng = &mut OsRng;
let mut retry = 0;
while retry < MAX_FAILUERS {
timer.next().await;
let mut ping_nonce: [u8; 32] = [0; 32];
rng.fill_bytes(&mut ping_nonce);
trace!("Send Ping message {:?}", ping_nonce);
self.peer
.send(&Self::id(), &PingProtocolMsg::Ping(ping_nonce))
.await?;
let d = Duration::from_secs(self.ping_timeout);
// Wait for Pong message
let pong_msg = match timeout(d, chan.recv()).await {
Ok(m) => m?,
Err(_) => {
retry += 1;
continue;
}
};
trace!("Received Pong message {:?}", pong_msg);
if pong_msg != ping_nonce {
retry += 1;
continue;
}
}
Err(NetError::Timeout.into())
}
}
#[async_trait]
impl Protocol for PingProtocol {
async fn start(self: Arc<Self>) -> Result<()> {
trace!("Start Ping protocol");
let (pong_chan, pong_chan_recv) = channel::bounded(1);
let (stop_signal_s, stop_signal) = channel::bounded::<Result<()>>(1);
let selfc = self.clone();
self.task_group.spawn(
selfc.clone().ping_loop(pong_chan_recv.clone()),
|res| async move {
if let TaskResult::Completed(result) = res {
let _ = stop_signal_s.send(result).await;
}
},
);
let listener = self.peer.register_listener::<Self>().await;
let result = select(self.recv_loop(&listener, pong_chan), stop_signal.recv()).await;
listener.cancel().await;
self.task_group.cancel().await;
match result {
Either::Left(res) => {
trace!("Receive loop stopped {:?}", res);
res
}
Either::Right(res) => {
let res = res?;
trace!("Ping loop stopped {:?}", res);
res
}
}
}
fn version() -> Result<Version> {
"0.1.0".parse()
}
fn id() -> ProtocolID {
"PING".into()
}
}
|
