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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use crate::auth::SymmetricEncrypt;
use crate::JmapInstance;
use super::request::Request;
use super::{Gossiper, Peer, UDP_MAX_PAYLOAD};
use common::IPC_CHANNEL_BUFFER;
use std::net::IpAddr;
use std::time::{Duration, Instant};
use std::{net::SocketAddr, sync::Arc};
use tokio::sync::watch;
use tokio::{net::UdpSocket, sync::mpsc};
use utils::config::Config;
pub struct GossiperBuilder {
bind_addr: IpAddr,
advertise_addr: IpAddr,
port: u16,
cluster_key: String,
peers: Vec<Peer>,
ping_interval: Duration,
}
// Quidnunc: an inquisitive and gossipy person, from Latin quid nunc? 'what now?'.
struct Quidnunc {
socket: UdpSocket,
nonce: Vec<u8>,
encryptor: SymmetricEncrypt,
}
impl GossiperBuilder {
pub fn try_parse(config: &mut Config) -> Option<Self> {
// Load configuration
let bind_addr = config.property::<IpAddr>("cluster.bind-addr")?;
let mut builder = GossiperBuilder {
bind_addr,
cluster_key: config
.value("cluster.key")
.filter(|s| !s.is_empty())?
.to_string(),
advertise_addr: config
.property::<IpAddr>("cluster.advertise-addr")
.unwrap_or(bind_addr),
port: config
.property_or_default::<u16>("cluster.bind-port", "1179")
.unwrap_or(1179),
ping_interval: config
.property_or_default("cluster.heartbeat", "1s")
.unwrap_or(Duration::from_secs(1)),
peers: Vec::new(),
};
for (_, addr) in config.properties::<IpAddr>("cluster.seed-nodes") {
if addr != builder.bind_addr && addr != builder.advertise_addr {
builder.peers.push(Peer::new_seed(addr));
}
}
builder.into()
}
pub async fn spawn(self, core: JmapInstance, mut shutdown_rx: watch::Receiver<bool>) {
// Bind port
let quidnunc = Arc::new(Quidnunc {
socket: match UdpSocket::bind(SocketAddr::new(self.bind_addr, self.port)).await {
Ok(socket) => socket,
Err(e) => {
tracing::error!("Failed to bind UDP socket on '{}': {}", self.bind_addr, e);
return;
}
},
nonce: b"428934328968".to_vec(),
encryptor: SymmetricEncrypt::new(
self.cluster_key.as_bytes(),
"gossipmonger context key",
),
});
tracing::info!(
bind.ip = self.bind_addr.to_string().as_str(),
bind.port = self.port,
"Starting gossip service"
);
// Create gossiper
let (gossip_tx, mut gossip_rx) = mpsc::channel::<(SocketAddr, Request)>(IPC_CHANNEL_BUFFER);
let mut gossiper = Gossiper {
addr: self.advertise_addr,
port: self.port,
epoch: 0,
peers: self.peers,
last_peer_pinged: u32::MAX as usize,
core,
gossip_tx,
};
let quidnunc_ = quidnunc.clone();
// Spawn gossip sender
tokio::spawn(async move {
while let Some((target_addr, response)) = gossip_rx.recv().await {
// Encrypt packets
let mut bytes = response.to_bytes();
match quidnunc_
.encryptor
.encrypt_in_place(&mut bytes, &quidnunc_.nonce)
{
Ok(_) => {
if let Err(err) = quidnunc_.socket.send_to(&bytes, &target_addr).await {
tracing::error!(
"Failed to send UDP packet to {}: {}",
target_addr,
err
);
}
}
Err(err) => {
tracing::error!("Failed to encrypt UDP packet to {}: {}", target_addr, err);
}
}
}
});
// Spawn gossip listener
let ping_interval = self.ping_interval;
tokio::spawn(async move {
let mut buf = vec![0; UDP_MAX_PAYLOAD];
let mut last_ping = Instant::now();
let mut wait = ping_interval;
loop {
tokio::select! {
packet = quidnunc.socket.recv_from(&mut buf) => {
match packet {
Ok((size, addr)) => {
// Decrypt packet
match quidnunc.encryptor.decrypt(&buf[..size], &quidnunc.nonce) {
Ok(bytes) => {
if let Some(request) = Request::from_bytes(&bytes) {
//tracing::debug!("Received packet from {}", addr);
match request {
Request::Ping(peers) => {
gossiper.handle_ping(peers, true).await;
},
Request::Pong(peers) => {
gossiper.handle_ping(peers, false).await;
},
Request::Leave(peers) => {
gossiper.handle_leave(peers).await;
},
}
} else {
tracing::debug!("Received invalid gossip message from {}", addr);
}
},
Err(err) => {
tracing::debug!("Failed to decrypt UDP packet from {}: {}", addr, err);
},
}
}
Err(e) => {
tracing::error!("Gossip process ended, socket.recv_from() failed: {}", e);
}
}
},
_ = tokio::time::sleep(wait) => {
// Send ping
gossiper.ping_peers().await;
last_ping = Instant::now();
},
_ = shutdown_rx.changed() => {
tracing::debug!("Gossip listener shutting down.");
// Broadcast leave message
gossiper.broadcast_leave().await;
break;
}
};
// Calculate next ping interval
wait = ping_interval.saturating_sub(last_ping.elapsed());
}
});
}
}
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