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use std::collections::HashMap;
use std::time::Duration;
use tokio_util::sync::CancellationToken;
use crate::app_state::AppState;
/// Holds all dependencies needed to spawn cluster background tasks.
pub struct ClusterTasks {
pub node_name: String,
pub node_id: String,
pub listen_addr: String,
pub cluster_key: String,
pub sync_interval: u64,
pub probe_interval: u64,
pub tunnel_ip_range: String,
pub state: AppState,
pub shutdown: CancellationToken,
}
impl ClusterTasks {
/// Spawn all cluster background tasks.
pub fn spawn_all(self) {
self.spawn_stale_cleanup();
self.spawn_health_check();
self.spawn_anti_entropy();
self.spawn_flap_detector();
}
/// Periodic task that marks nodes as stale after 120s without contact.
fn spawn_stale_cleanup(&self) {
let state = self.state.clone();
let interval = self.sync_interval;
let token = self.shutdown.clone();
tokio::spawn(async move {
loop {
tokio::select! {
_ = token.cancelled() => {
tracing::info!("Stale-node cleanup task shutting down");
return;
}
_ = tokio::time::sleep(Duration::from_secs(interval)) => {}
}
if let Err(e) = state.node_repo.mark_stale(120).await {
tracing::warn!("Failed to mark stale nodes: {}", e);
}
}
});
}
/// Flap-suppressed health check with ICMP probe for latency data.
fn spawn_health_check(&self) {
if self.probe_interval == 0 {
return;
}
let token = self.shutdown.clone();
let interval_dur = Duration::from_secs(self.probe_interval);
let node_repo = self.state.node_repo.clone();
let probe_repo = self.state.probe_repo.clone();
let node_name = self.node_name.clone();
let cluster_key = self.cluster_key.clone();
let cluster_cache = self.state.cluster_cache.clone();
tokio::spawn(async move {
let mut fail_streaks: HashMap<String, u32> = HashMap::new();
let mut interval = tokio::time::interval(interval_dur);
interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip);
loop {
tokio::select! {
_ = token.cancelled() => break,
_ = interval.tick() => {}
}
let nodes = match node_repo.list_all().await {
Ok(n) => n,
Err(e) => {
tracing::warn!("Failed to list nodes for health check: {e}");
continue;
}
};
let local = nodes.iter().find(|n| n.name == node_name);
for node in &nodes {
if node.name == node_name {
continue;
}
let healthy = crate::cluster::aggregator::ClusterAggregator::health_check(
&node.listen_addr,
&cluster_key,
)
.await;
let prev_fails = fail_streaks.get(&node.listen_addr).copied().unwrap_or(0);
if healthy {
if prev_fails >= 2 {
let _ = node_repo.mark_online(&node.id).await;
cluster_cache.invalidate(&node.listen_addr).await;
tracing::info!(
"Node {} ({}) is back online",
node.name,
node.listen_addr
);
}
fail_streaks.insert(node.listen_addr.clone(), 0);
// Also run ICMP probe for latency data
if let Some(local_node) = local {
let _ = crate::services::probe::probe_between(
local_node,
node,
&probe_repo,
)
.await;
}
} else {
let new_fails = prev_fails + 1;
fail_streaks.insert(node.listen_addr.clone(), new_fails);
if new_fails >= 2 && prev_fails < 2 {
let _ = node_repo.mark_stale_node(&node.id).await;
cluster_cache.mark_stale(&node.listen_addr).await;
tracing::warn!(
"Node {} ({}) went offline after {} consecutive failures",
node.name,
node.listen_addr,
new_fails
);
}
}
}
}
});
}
/// Periodic anti-entropy task that exchanges node lists with a random online peer.
fn spawn_anti_entropy(&self) {
let token = self.shutdown.clone();
let interval_dur = Duration::from_secs(self.sync_interval);
let node_repo = self.state.node_repo.clone();
let cluster_key = self.cluster_key.clone();
let listen_addr = self.listen_addr.clone();
let tunnel_ip_range = self.tunnel_ip_range.clone();
let settings_repo = self.state.settings_repo.clone();
let peer_repo = self.state.peer_repo.clone();
tokio::spawn(async move {
let mut interval = tokio::time::interval(interval_dur);
interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip);
loop {
tokio::select! {
_ = token.cancelled() => break,
_ = interval.tick() => {}
}
let nodes = match node_repo.list_all().await {
Ok(n) => n,
Err(_) => continue,
};
let online_peers: Vec<_> = nodes
.iter()
.filter(|n| n.online && n.listen_addr != listen_addr)
.collect();
if online_peers.is_empty() {
continue;
}
// Pick a random peer
let idx = {
let now = std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)
.unwrap_or_default();
(now.subsec_nanos() as usize) % online_peers.len()
};
let peer = online_peers[idx];
let my_info: Vec<crate::grpc::generated::NodeInfo> = nodes
.iter()
.map(|n| crate::grpc::generated::NodeInfo {
name: n.name.clone(),
listen_addr: n.listen_addr.clone(),
local_asn: n.local_asn,
description: n.description.clone().unwrap_or_default(),
last_seen_at: n.last_seen_at.clone(),
wg_public_key: String::new(),
tunnel_ip: String::new(),
tunnel_ipv6: String::new(),
})
.collect();
match crate::cluster::aggregator::ClusterAggregator::exchange_with(
&peer.listen_addr,
&cluster_key,
my_info,
)
.await
{
Ok(remote_nodes) => {
for info in &remote_nodes {
if info.listen_addr == listen_addr {
continue;
}
if let Ok(Some(_)) =
node_repo.find_by_listen_addr(&info.listen_addr).await
{
continue;
}
let _ = node_repo
.create(
&info.name,
&info.listen_addr,
info.local_asn,
&info.description,
)
.await;
}
// After discovering new nodes, sync cluster configs
if !tunnel_ip_range.is_empty() {
let nodes = match node_repo.list_all().await {
Ok(n) => n,
Err(_) => continue,
};
let my_tunnel_ip = nodes
.iter()
.find(|n| n.listen_addr == listen_addr)
.and_then(|n| {
if n.tunnel_ip.is_empty() {
None
} else {
Some(n.tunnel_ip.clone())
}
})
.unwrap_or_default();
if !my_tunnel_ip.is_empty()
&& let Ok(settings) = settings_repo.load().await
{
let _ = crate::cluster::tunnel::sync_cluster_bird(
&peer_repo,
&settings,
&node_repo,
&my_tunnel_ip,
)
.await;
}
}
}
Err(e) => {
tracing::debug!(
"Periodic ExchangeNodes with {} failed: {}",
peer.listen_addr,
e
);
}
}
}
});
}
/// BGP flap detector using iBGP listener with socket polling fallback.
fn spawn_flap_detector(&self) {
let node_id = self.node_id.clone();
let flap_node_name = self.node_name.clone();
let flap_repo = self.state.flap_event_repo.clone();
let token = self.shutdown.clone();
tokio::spawn(async move {
tracing::info!("Starting BGP flap detector for node '{flap_node_name}' ({node_id})");
let (tx, rx) =
tokio::sync::mpsc::channel::<crate::services::bgp_listener::PathChange>(1024);
match crate::services::bgp_listener::BgpListener::bind(node_id.clone()).await {
Ok(listener) => {
tracing::info!("iBGP listener active on [::1]:1790");
let bgp_tx = tx.clone();
let bgp_token = token.clone();
tokio::spawn(async move {
tokio::select! {
_ = bgp_token.cancelled() => {
tracing::info!("iBGP listener shutting down");
}
_ = listener.run(bgp_tx) => {}
}
});
let mut detector = crate::services::flap_detector::FlapDetector::new(
node_id.clone(),
flap_repo,
);
detector.run(rx, token).await;
}
Err(e) => {
tracing::warn!(
"iBGP listener unavailable ({e}), flap detection will use socket polling fallback"
);
let _keep_tx = tx; // Keep channel alive so rx doesn't close
let mut detector =
crate::services::flap_detector::FlapDetector::new(node_id, flap_repo);
detector.run(rx, token).await;
}
}
});
}
}