dearsky/numa
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reduce network change detection to 5s with tiered polling

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LAN IP checked every 5s (cheap UDP socket call). Full upstream
re-detection runs every 30s as safety net, or immediately when
LAN IP changes. Reduces worst-case network switch recovery from
30s to 5s.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Razvan Dimescu
2026-03-22 19:36:03 +02:00
parent 4f8afcd5b2
commit 1bf11190d5
2 changed files with 9 additions and 6 deletions
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13
src/main.rs
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@@ -279,14 +279,17 @@ async fn main() -> numa::Result<()> {
}
async fn network_watch_loop(ctx: Arc<numa::ctx::ServerCtx>) {
let mut interval = tokio::time::interval(Duration::from_secs(30));
let mut tick: u64 = 0;
let mut interval = tokio::time::interval(Duration::from_secs(5));
interval.tick().await; // skip immediate tick
loop {
interval.tick().await;
tick += 1;
let mut changed = false;
// Check LAN IP change
// Check LAN IP change (every 5s — cheap, one UDP socket call)
if let Some(new_ip) = numa::lan::detect_lan_ip() {
let mut current_ip = ctx.lan_ip.lock().unwrap();
if new_ip != *current_ip {
@@ -296,10 +299,10 @@ async fn network_watch_loop(ctx: Arc<numa::ctx::ServerCtx>) {
}
}
// Check upstream change (only for auto-detected upstream)
if ctx.upstream_auto {
// Check upstream change every 30s or immediately on LAN IP change
// (heavier — spawns scutil/ipconfig, only when auto-detected)
if ctx.upstream_auto && (changed || tick.is_multiple_of(6)) {
let dns_info = numa::system_dns::discover_system_dns();
// Use detected upstream, or try DHCP-provided DNS, or fall back to Quad9
let new_addr = dns_info
.default_upstream
.or_else(numa::system_dns::detect_dhcp_dns)