fix(pipeline): stop idle keepalive polls, reduce idle requests#1322
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Previous cap of 2s caused ~1200 requests/5min idle with 15 deployments. New escalation: 20ms→80ms→200ms→500ms→2s→5s→10s→20s. After 15+ consecutive empties, sessions poll every 20s. Estimated idle reduction: ~1200/5min → ~200/5min. Zero latency impact on active traffic — select! races timer against client reads, so real data fires immediately. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Verified locally after adding the mixed-deployment guard: all-legacy idle sessions can stop polling, but mixed fleets keep emitting empty polls so round-robin can still reach a long-poll-capable peer.
Tests:
cargo test --lib tunnel_client::tests::tunnel_loop_keeps_polling_when_only_some_deployments_legacy -- --nocapturecargo test --libcargo build --release
Answered via LLM, Supervised @therealaleph
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Ship PR #1322 by @yyoyoian-pixel: Full Tunnel idle sessions now reduce empty keepalive request load, while mixed deployments keep polling so long-poll-capable peers can continue delivering remote-to-client data. Local verification: - cargo test --lib - cargo build --release - cargo build --bin mhrv-rs-ui --release --features ui
This was referenced May 20, 2026
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Summary
Stops keepalive polling on truly idle sessions and adds gradual backoff with separate idle tier tracking. Reduces idle Apps Script requests from ~1200/5min to ~35/5min for truly idle sessions.
How it works
Separate counters
consecutive_empty: controls pipeline depth management (resets to 0 on data — sessions can ramp up immediately)idle_tier: controls keepalive delay (halves on server-pushed data instead of full reset — prevents push notifications from yo-yoing the backoff)Measured results
Note: sessions receiving periodic server pushes (Instagram MQTT, Telegram, etc.) never reach idle_tier > 3 because they keep getting data. Those requests are real traffic, not wasted keepalive polls. True idle sessions (no server pushes) drop to zero polls.
No latency impact
tokio::select!races delay timer against client socket readsconsecutive_empty(resets to 0) — not affected by idle_tierTest plan
🤖 Generated with Claude Code