v4.8.2

changelog.md

@@ -1,5 +1,39 @@
 # Changelog
 
+## 2026-03-17 - 4.8.2 - fix(rust-edge)
+refactor tunnel I/O to preserve TLS state and prioritize control frames
+
+- replace split TLS handling with a single-owner TunnelIo to avoid handshake and buffered read corruption
+- prioritize control frames over data frames to prevent WINDOW_UPDATE starvation and flow-control deadlocks
+- improve tunnel reliability with incremental frame parsing, liveness/error events, and corrupt frame header logging
+
+## 2026-03-17 - 4.8.1 - fix(remoteingress-core)
+remove tunnel writer timeouts from edge and hub buffered writes
+
+- Drops the 30 second timeout wrapper around writer.write_all and writer.flush in both edge and hub tunnel writers.
+- Updates error logging to report write failures without referring to stalled writes.
+
+## 2026-03-17 - 4.8.0 - feat(events)
+include disconnect reasons in edge and hub management events
+
+- Add reason fields to tunnelDisconnected and edgeDisconnected events emitted from the Rust core and binary bridge
+- Propagate specific disconnect causes such as EOF, liveness timeout, writer failure, handshake failure, and hub cancellation
+- Update TypeScript edge and hub classes to log and forward disconnect reason data
+- Extend serialization tests to cover the new reason fields
+
+## 2026-03-17 - 4.7.2 - fix(remoteingress-core)
+add tunnel write timeouts and scale initial stream windows by active stream count
+
+- Wrap tunnel frame writes and flushes in a 30-second timeout on both edge and hub to detect stalled writers and trigger faster reconnect or cleanup.
+- Compute each stream's initial send window from the current active stream count instead of using a fixed window to keep total in-flight data within the 32MB budget.
+
+## 2026-03-17 - 4.7.1 - fix(remoteingress-core)
+improve tunnel failure detection and reconnect handling
+
+- Enable TCP keepalive on edge and hub connections to detect silent network failures sooner
+- Trigger immediate reconnect or disconnect when tunnel writer tasks fail instead of waiting for liveness timeouts
+- Prevent active stream counter underflow during concurrent connection cleanup
+
 ## 2026-03-16 - 4.7.0 - feat(edge,protocol,test)
 add configurable edge bind address and expand flow-control test coverage
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/remoteingress",
-  "version": "4.7.0",
+  "version": "4.8.2",
   "private": false,
   "description": "Edge ingress tunnel for DcRouter - accepts incoming TCP connections at network edge and tunnels them to DcRouter SmartProxy preserving client IP via PROXY protocol v1.",
   "main": "dist_ts/index.js",

rust/Cargo.lock

@@ -568,7 +568,9 @@ dependencies = [
 name = "remoteingress-protocol"
 version = "2.0.0"
 dependencies = [
+ "log",
  "tokio",
+ "tokio-util",
 ]
 
 [[package]]

rust/crates/remoteingress-bin/src/main.rs

@@ -173,10 +173,10 @@ async fn handle_request(
                                     serde_json::json!({ "edgeId": edge_id, "peerAddr": peer_addr }),
                                 );
                             }
-                            HubEvent::EdgeDisconnected { edge_id } => {
+                            HubEvent::EdgeDisconnected { edge_id, reason } => {
                                 send_event(
                                     "edgeDisconnected",
-                                    serde_json::json!({ "edgeId": edge_id }),
+                                    serde_json::json!({ "edgeId": edge_id, "reason": reason }),
                                 );
                             }
                             HubEvent::StreamOpened {
@@ -295,8 +295,8 @@ async fn handle_request(
                             EdgeEvent::TunnelConnected => {
                                 send_event("tunnelConnected", serde_json::json!({}));
                             }
-                            EdgeEvent::TunnelDisconnected => {
-                                send_event("tunnelDisconnected", serde_json::json!({}));
+                            EdgeEvent::TunnelDisconnected { reason } => {
+                                send_event("tunnelDisconnected", serde_json::json!({ "reason": reason }));
                             }
                             EdgeEvent::PublicIpDiscovered { ip } => {
                                 send_event(

rust/crates/remoteingress-core/src/edge.rs

@@ -2,7 +2,7 @@ use std::collections::HashMap;
 use std::sync::atomic::{AtomicU32, Ordering};
 use std::sync::Arc;
 use std::time::Duration;
-use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::net::{TcpListener, TcpStream};
 use tokio::sync::{mpsc, Mutex, Notify, RwLock};
 use tokio::task::JoinHandle;
@@ -64,7 +64,8 @@ struct ConfigUpdate {
 #[serde(tag = "type")]
 pub enum EdgeEvent {
     TunnelConnected,
-    TunnelDisconnected,
+    #[serde(rename_all = "camelCase")]
+    TunnelDisconnected { reason: String },
     #[serde(rename_all = "camelCase")]
     PublicIpDiscovered { ip: String },
     #[serde(rename_all = "camelCase")]
@@ -236,10 +237,15 @@ async fn edge_main_loop(
         }
 
         *connected.write().await = false;
+        // Extract reason for disconnect event
+        let reason = match &result {
+            EdgeLoopResult::Reconnect(r) => r.clone(),
+            EdgeLoopResult::Shutdown => "shutdown".to_string(),
+        };
         // Only emit disconnect event on actual disconnection, not on failed reconnects.
         // Failed reconnects never reach line 335 (handshake success), so was_connected is false.
         if was_connected {
-            let _ = event_tx.try_send(EdgeEvent::TunnelDisconnected);
+            let _ = event_tx.try_send(EdgeEvent::TunnelDisconnected { reason: reason.clone() });
         }
         active_streams.store(0, Ordering::Relaxed);
         // Reset stream ID counter for next connection cycle
@@ -248,7 +254,7 @@ async fn edge_main_loop(
 
         match result {
             EdgeLoopResult::Shutdown => break,
-            EdgeLoopResult::Reconnect => {
+            EdgeLoopResult::Reconnect(_) => {
                 log::info!("Reconnecting in {}ms...", backoff_ms);
                 tokio::select! {
                     _ = tokio::time::sleep(Duration::from_millis(backoff_ms)) => {}
@@ -263,7 +269,7 @@ async fn edge_main_loop(
 
 enum EdgeLoopResult {
     Shutdown,
-    Reconnect,
+    Reconnect(String),  // reason for disconnection
 }
 
 async fn connect_to_hub_and_run(
@@ -284,53 +290,70 @@ async fn connect_to_hub_and_run(
         Ok(s) => {
             // Disable Nagle's algorithm for low-latency control frames (PING/PONG, WINDOW_UPDATE)
             let _ = s.set_nodelay(true);
+            // TCP keepalive detects silent network failures (NAT timeout, path change)
+            // faster than the 45s application-level liveness timeout.
+            let ka = socket2::TcpKeepalive::new()
+                .with_time(Duration::from_secs(30));
+            #[cfg(target_os = "linux")]
+            let ka = ka.with_interval(Duration::from_secs(10));
+            let _ = socket2::SockRef::from(&s).set_tcp_keepalive(&ka);
             s
         }
         Err(e) => {
             log::error!("Failed to connect to hub at {}: {}", addr, e);
-            return EdgeLoopResult::Reconnect;
+            return EdgeLoopResult::Reconnect(format!("tcp_connect_failed: {}", e));
         }
     };
 
     let server_name = rustls::pki_types::ServerName::try_from(config.hub_host.clone())
         .unwrap_or_else(|_| rustls::pki_types::ServerName::try_from("remoteingress-hub".to_string()).unwrap());
 
-    let tls_stream = match connector.connect(server_name, tcp).await {
+    let mut tls_stream = match connector.connect(server_name, tcp).await {
         Ok(s) => s,
         Err(e) => {
             log::error!("TLS handshake failed: {}", e);
-            return EdgeLoopResult::Reconnect;
+            return EdgeLoopResult::Reconnect(format!("tls_handshake_failed: {}", e));
         }
     };
 
-    let (read_half, mut write_half) = tokio::io::split(tls_stream);
-
-    // Send auth line
+    // Send auth line (we own the whole stream — no split)
     let auth_line = format!("EDGE {} {}\n", config.edge_id, config.secret);
-    if write_half.write_all(auth_line.as_bytes()).await.is_err() {
-        return EdgeLoopResult::Reconnect;
+    if tls_stream.write_all(auth_line.as_bytes()).await.is_err() {
+        return EdgeLoopResult::Reconnect("auth_write_failed".to_string());
+    }
+    if tls_stream.flush().await.is_err() {
+        return EdgeLoopResult::Reconnect("auth_flush_failed".to_string());
     }
 
-    // Read handshake response line from hub (JSON with initial config)
-    let mut buf_reader = BufReader::new(read_half);
-    let mut handshake_line = String::new();
-    match buf_reader.read_line(&mut handshake_line).await {
-        Ok(0) => {
-            log::error!("Hub rejected connection (EOF before handshake)");
-            return EdgeLoopResult::Reconnect;
-        }
-        Ok(_) => {}
-        Err(e) => {
-            log::error!("Failed to read handshake response: {}", e);
-            return EdgeLoopResult::Reconnect;
+    // Read handshake line byte-by-byte (no BufReader — into_inner corrupts TLS state)
+    let mut handshake_bytes = Vec::with_capacity(512);
+    let mut byte = [0u8; 1];
+    loop {
+        match tls_stream.read_exact(&mut byte).await {
+            Ok(_) => {
+                handshake_bytes.push(byte[0]);
+                if byte[0] == b'\n' { break; }
+                if handshake_bytes.len() > 8192 {
+                    return EdgeLoopResult::Reconnect("handshake_too_long".to_string());
+                }
+            }
+            Err(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => {
+                log::error!("Hub rejected connection (EOF before handshake)");
+                return EdgeLoopResult::Reconnect("hub_rejected_eof".to_string());
+            }
+            Err(e) => {
+                log::error!("Failed to read handshake response: {}", e);
+                return EdgeLoopResult::Reconnect(format!("handshake_read_failed: {}", e));
+            }
         }
     }
+    let handshake_line = String::from_utf8_lossy(&handshake_bytes);
 
     let handshake: HandshakeConfig = match serde_json::from_str(handshake_line.trim()) {
         Ok(h) => h,
         Err(e) => {
             log::error!("Invalid handshake response: {}", e);
-            return EdgeLoopResult::Reconnect;
+            return EdgeLoopResult::Reconnect(format!("handshake_invalid: {}", e));
         }
     };
 
@@ -381,44 +404,13 @@ async fn connect_to_hub_and_run(
     let client_writers: Arc<Mutex<HashMap<u32, EdgeStreamState>>> =
         Arc::new(Mutex::new(HashMap::new()));
 
-    // QoS dual-channel tunnel writer: control frames (PONG/WINDOW_UPDATE/CLOSE/OPEN)
-    // have priority over data frames (DATA). Prevents PING starvation under load.
+    // QoS dual-channel: ctrl frames have priority over data frames.
+    // Stream handlers send through these channels → TunnelIo drains them.
     let (tunnel_ctrl_tx, mut tunnel_ctrl_rx) = mpsc::channel::<Vec<u8>>(256);
     let (tunnel_data_tx, mut tunnel_data_rx) = mpsc::channel::<Vec<u8>>(4096);
-    // Legacy alias — control channel for PONG, CLOSE, WINDOW_UPDATE, OPEN
     let tunnel_writer_tx = tunnel_ctrl_tx.clone();
-    let tw_token = connection_token.clone();
-    let tunnel_writer_handle = tokio::spawn(async move {
-        // BufWriter coalesces small writes (frame headers, control frames) into fewer
-        // TLS records and syscalls. Flushed after each frame to avoid holding data.
-        let mut writer = tokio::io::BufWriter::with_capacity(65536, write_half);
-        loop {
-            tokio::select! {
-                biased; // control frames always take priority over data
-                ctrl = tunnel_ctrl_rx.recv() => {
-                    match ctrl {
-                        Some(frame_data) => {
-                            if writer.write_all(&frame_data).await.is_err() { break; }
-                            if writer.flush().await.is_err() { break; }
-                        }
-                        None => break,
-                    }
-                }
-                data = tunnel_data_rx.recv() => {
-                    match data {
-                        Some(frame_data) => {
-                            if writer.write_all(&frame_data).await.is_err() { break; }
-                            if writer.flush().await.is_err() { break; }
-                        }
-                        None => break,
-                    }
-                }
-                _ = tw_token.cancelled() => break,
-            }
-        }
-    });
 
-    // Start TCP listeners for initial ports (hot-reloadable)
+    // Start TCP listeners for initial ports
     let mut port_listeners: HashMap<u16, JoinHandle<()>> = HashMap::new();
     let bind_address = config.bind_address.as_deref().unwrap_or("0.0.0.0");
     apply_port_config(
@@ -434,118 +426,180 @@ async fn connect_to_hub_and_run(
         bind_address,
     );
 
-    // Heartbeat: liveness timeout detects silent hub failures
+    // Single-owner I/O engine — no tokio::io::split, no mutex
+    let mut tunnel_io = remoteingress_protocol::TunnelIo::new(tls_stream, Vec::new());
+
     let liveness_timeout_dur = Duration::from_secs(45);
     let mut last_activity = Instant::now();
     let mut liveness_deadline = Box::pin(sleep_until(last_activity + liveness_timeout_dur));
 
-    // Read frames from hub
-    let mut frame_reader = FrameReader::new(buf_reader);
-    let result = loop {
-        tokio::select! {
-            frame_result = frame_reader.next_frame() => {
-                match frame_result {
-                    Ok(Some(frame)) => {
-                        // Reset liveness on any received frame
-                        last_activity = Instant::now();
-                        liveness_deadline.as_mut().reset(last_activity + liveness_timeout_dur);
-
-                        match frame.frame_type {
-                            FRAME_DATA_BACK => {
-                                // Non-blocking dispatch to per-stream channel.
-                                // With flow control, the sender should rarely exceed the channel capacity.
-                                let mut writers = client_writers.lock().await;
-                                if let Some(state) = writers.get(&frame.stream_id) {
-                                    if state.back_tx.try_send(frame.payload).is_err() {
-                                        log::warn!("Stream {} back-channel full, closing stream", frame.stream_id);
-                                        writers.remove(&frame.stream_id);
-                                    }
+    let result = 'io_loop: loop {
+        // Drain any buffered frames
+        loop {
+            match tunnel_io.try_parse_frame() {
+                Some(Ok(frame)) => {
+                    last_activity = Instant::now();
+                    liveness_deadline.as_mut().reset(last_activity + liveness_timeout_dur);
+                    match frame.frame_type {
+                        FRAME_DATA_BACK => {
+                            let mut writers = client_writers.lock().await;
+                            if let Some(state) = writers.get(&frame.stream_id) {
+                                if state.back_tx.try_send(frame.payload).is_err() {
+                                    log::warn!("Stream {} back-channel full, closing", frame.stream_id);
+                                    writers.remove(&frame.stream_id);
                                 }
                             }
-                            FRAME_WINDOW_UPDATE_BACK => {
-                                // Hub consumed data — increase our send window for this stream (upload direction)
-                                if let Some(increment) = decode_window_update(&frame.payload) {
-                                    if increment > 0 {
-                                        let writers = client_writers.lock().await;
-                                        if let Some(state) = writers.get(&frame.stream_id) {
-                                            let prev = state.send_window.fetch_add(increment, Ordering::Release);
-                                            if prev + increment > MAX_WINDOW_SIZE {
-                                                state.send_window.store(MAX_WINDOW_SIZE, Ordering::Release);
-                                            }
-                                            state.window_notify.notify_one();
+                        }
+                        FRAME_WINDOW_UPDATE_BACK => {
+                            if let Some(increment) = decode_window_update(&frame.payload) {
+                                if increment > 0 {
+                                    let writers = client_writers.lock().await;
+                                    if let Some(state) = writers.get(&frame.stream_id) {
+                                        let prev = state.send_window.fetch_add(increment, Ordering::Release);
+                                        if prev + increment > MAX_WINDOW_SIZE {
+                                            state.send_window.store(MAX_WINDOW_SIZE, Ordering::Release);
                                         }
+                                        state.window_notify.notify_one();
                                     }
                                 }
                             }
-                            FRAME_CLOSE_BACK => {
-                                let mut writers = client_writers.lock().await;
+                        }
+                        FRAME_CLOSE_BACK => {
+                            let mut writers = client_writers.lock().await;
+                            writers.remove(&frame.stream_id);
+                        }
+                        FRAME_CONFIG => {
+                            if let Ok(update) = serde_json::from_slice::<ConfigUpdate>(&frame.payload) {
+                                log::info!("Config update from hub: ports {:?}", update.listen_ports);
+                                *listen_ports.write().await = update.listen_ports.clone();
+                                let _ = event_tx.try_send(EdgeEvent::PortsUpdated {
+                                    listen_ports: update.listen_ports.clone(),
+                                });
+                                apply_port_config(
+                                    &update.listen_ports,
+                                    &mut port_listeners,
+                                    &tunnel_writer_tx,
+                                    &tunnel_data_tx,
+                                    &client_writers,
+                                    active_streams,
+                                    next_stream_id,
+                                    &config.edge_id,
+                                    connection_token,
+                                    bind_address,
+                                );
+                            }
+                        }
+                        FRAME_PING => {
+                            // Queue PONG directly — no channel round-trip, guaranteed delivery
+                            tunnel_io.queue_ctrl(encode_frame(0, FRAME_PONG, &[]));
+                        }
+                        _ => {
+                            log::warn!("Unexpected frame type {} from hub", frame.frame_type);
+                        }
+                    }
+                }
+                Some(Err(e)) => {
+                    log::error!("Hub frame error: {}", e);
+                    break 'io_loop EdgeLoopResult::Reconnect(format!("hub_frame_error: {}", e));
+                }
+                None => break,
+            }
+        }
+
+        // Poll I/O: write(ctrl→data), flush, read, channels, timers
+        let event = std::future::poll_fn(|cx| {
+            tunnel_io.poll_step(cx, &mut tunnel_ctrl_rx, &mut tunnel_data_rx, &mut liveness_deadline, connection_token)
+        }).await;
+
+        match event {
+            remoteingress_protocol::TunnelEvent::Frame(frame) => {
+                last_activity = Instant::now();
+                liveness_deadline.as_mut().reset(last_activity + liveness_timeout_dur);
+                match frame.frame_type {
+                    FRAME_DATA_BACK => {
+                        let mut writers = client_writers.lock().await;
+                        if let Some(state) = writers.get(&frame.stream_id) {
+                            if state.back_tx.try_send(frame.payload).is_err() {
+                                log::warn!("Stream {} back-channel full, closing", frame.stream_id);
                                 writers.remove(&frame.stream_id);
                             }
-                            FRAME_CONFIG => {
-                                if let Ok(update) = serde_json::from_slice::<ConfigUpdate>(&frame.payload) {
-                                    log::info!("Config update from hub: ports {:?}", update.listen_ports);
-                                    *listen_ports.write().await = update.listen_ports.clone();
-                                    let _ = event_tx.try_send(EdgeEvent::PortsUpdated {
-                                        listen_ports: update.listen_ports.clone(),
-                                    });
-                                    apply_port_config(
-                                        &update.listen_ports,
-                                        &mut port_listeners,
-                                        &tunnel_writer_tx,
-                                        &tunnel_data_tx,
-                                        &client_writers,
-                                        active_streams,
-                                        next_stream_id,
-                                        &config.edge_id,
-                                        connection_token,
-                                        bind_address,
-                                    );
-                                }
-                            }
-                            FRAME_PING => {
-                                let pong_frame = encode_frame(0, FRAME_PONG, &[]);
-                                if tunnel_writer_tx.try_send(pong_frame).is_err() {
-                                    // Control channel full (WINDOW_UPDATE burst from many streams).
-                                    // DON'T disconnect — the 45s liveness timeout gives margin
-                                    // for the channel to drain and the next PONG to succeed.
-                                    log::warn!("PONG send failed, control channel full — skipping this cycle");
-                                }
-                                log::trace!("Received PING from hub, sent PONG");
-                            }
-                            _ => {
-                                log::warn!("Unexpected frame type {} from hub", frame.frame_type);
-                            }
                         }
                     }
-                    Ok(None) => {
-                        log::info!("Hub disconnected (EOF)");
-                        break EdgeLoopResult::Reconnect;
+                    FRAME_WINDOW_UPDATE_BACK => {
+                        if let Some(increment) = decode_window_update(&frame.payload) {
+                            if increment > 0 {
+                                let writers = client_writers.lock().await;
+                                if let Some(state) = writers.get(&frame.stream_id) {
+                                    let prev = state.send_window.fetch_add(increment, Ordering::Release);
+                                    if prev + increment > MAX_WINDOW_SIZE {
+                                        state.send_window.store(MAX_WINDOW_SIZE, Ordering::Release);
+                                    }
+                                    state.window_notify.notify_one();
+                                }
+                            }
+                        }
                     }
-                    Err(e) => {
-                        log::error!("Hub frame error: {}", e);
-                        break EdgeLoopResult::Reconnect;
+                    FRAME_CLOSE_BACK => {
+                        let mut writers = client_writers.lock().await;
+                        writers.remove(&frame.stream_id);
+                    }
+                    FRAME_CONFIG => {
+                        if let Ok(update) = serde_json::from_slice::<ConfigUpdate>(&frame.payload) {
+                            log::info!("Config update from hub: ports {:?}", update.listen_ports);
+                            *listen_ports.write().await = update.listen_ports.clone();
+                            let _ = event_tx.try_send(EdgeEvent::PortsUpdated {
+                                listen_ports: update.listen_ports.clone(),
+                            });
+                            apply_port_config(
+                                &update.listen_ports,
+                                &mut port_listeners,
+                                &tunnel_writer_tx,
+                                &tunnel_data_tx,
+                                &client_writers,
+                                active_streams,
+                                next_stream_id,
+                                &config.edge_id,
+                                connection_token,
+                                bind_address,
+                            );
+                        }
+                    }
+                    FRAME_PING => {
+                        tunnel_io.queue_ctrl(encode_frame(0, FRAME_PONG, &[]));
+                    }
+                    _ => {
+                        log::warn!("Unexpected frame type {} from hub", frame.frame_type);
                     }
                 }
             }
-            _ = &mut liveness_deadline => {
-                log::warn!("Hub liveness timeout (no frames for {}s), reconnecting",
-                    liveness_timeout_dur.as_secs());
-                break EdgeLoopResult::Reconnect;
+            remoteingress_protocol::TunnelEvent::Eof => {
+                log::info!("Hub disconnected (EOF)");
+                break EdgeLoopResult::Reconnect("hub_eof".to_string());
             }
-            _ = connection_token.cancelled() => {
-                log::info!("Connection cancelled");
-                break EdgeLoopResult::Shutdown;
+            remoteingress_protocol::TunnelEvent::ReadError(e) => {
+                log::error!("Hub frame read error: {}", e);
+                break EdgeLoopResult::Reconnect(format!("hub_frame_error: {}", e));
             }
-            _ = shutdown_rx.recv() => {
+            remoteingress_protocol::TunnelEvent::WriteError(e) => {
+                log::error!("Tunnel write error: {}", e);
+                break EdgeLoopResult::Reconnect(format!("tunnel_write_error: {}", e));
+            }
+            remoteingress_protocol::TunnelEvent::LivenessTimeout => {
+                log::warn!("Hub liveness timeout (no frames for {}s), reconnecting", liveness_timeout_dur.as_secs());
+                break EdgeLoopResult::Reconnect("liveness_timeout".to_string());
+            }
+            remoteingress_protocol::TunnelEvent::Cancelled => {
+                if shutdown_rx.try_recv().is_ok() {
+                    break EdgeLoopResult::Shutdown;
+                }
                 break EdgeLoopResult::Shutdown;
             }
         }
     };
 
-    // Cancel connection token to propagate to all child tasks BEFORE aborting
+    // Cleanup
     connection_token.cancel();
     stun_handle.abort();
-    tunnel_writer_handle.abort();
     for (_, h) in port_listeners.drain() {
         h.abort();
     }
@@ -636,7 +690,18 @@ fn apply_port_config(
                                         Arc::clone(&active_streams),
                                     )
                                     .await;
-                                    active_streams.fetch_sub(1, Ordering::Relaxed);
+                                    // Saturating decrement: prevent underflow when
+                                    // edge_main_loop's store(0) races with task cleanup.
+                                    loop {
+                                        let current = active_streams.load(Ordering::Relaxed);
+                                        if current == 0 { break; }
+                                        if active_streams.compare_exchange_weak(
+                                            current, current - 1,
+                                            Ordering::Relaxed, Ordering::Relaxed,
+                                        ).is_ok() {
+                                            break;
+                                        }
+                                    }
                                 });
                             }
                             Err(e) => {
@@ -681,8 +746,13 @@ async fn handle_client_connection(
     }
 
     // Set up channel for data coming back from hub (capacity 16 is sufficient with flow control)
-    let (back_tx, mut back_rx) = mpsc::channel::<Vec<u8>>(256);
-    let send_window = Arc::new(AtomicU32::new(INITIAL_STREAM_WINDOW));
+    let (back_tx, mut back_rx) = mpsc::channel::<Vec<u8>>(1024);
+    // Adaptive initial window: scale with current stream count to keep total in-flight
+    // data within the 32MB budget. Prevents burst flooding when many streams open.
+    let initial_window = remoteingress_protocol::compute_window_for_stream_count(
+        active_streams.load(Ordering::Relaxed),
+    );
+    let send_window = Arc::new(AtomicU32::new(initial_window));
     let window_notify = Arc::new(Notify::new());
     {
         let mut writers = client_writers.lock().await;
@@ -921,9 +991,10 @@ mod tests {
 
     #[test]
     fn test_edge_event_tunnel_disconnected() {
-        let event = EdgeEvent::TunnelDisconnected;
+        let event = EdgeEvent::TunnelDisconnected { reason: "hub_eof".to_string() };
         let json = serde_json::to_value(&event).unwrap();
         assert_eq!(json["type"], "tunnelDisconnected");
+        assert_eq!(json["reason"], "hub_eof");
     }
 
     #[test]

rust/crates/remoteingress-protocol/Cargo.toml

@@ -4,7 +4,9 @@ version = "2.0.0"
 edition = "2021"
 
 [dependencies]
-tokio = { version = "1", features = ["io-util"] }
+tokio = { version = "1", features = ["io-util", "sync", "time"] }
+tokio-util = "0.7"
+log = "0.4"
 
 [dev-dependencies]
 tokio = { version = "1", features = ["io-util", "macros", "rt"] }

rust/crates/remoteingress-protocol/src/lib.rs

@@ -1,4 +1,8 @@
-use tokio::io::{AsyncRead, AsyncReadExt};
+use std::collections::VecDeque;
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, ReadBuf};
 
 // Frame type constants
 pub const FRAME_OPEN: u8 = 0x01;
@@ -120,9 +124,13 @@ impl<R: AsyncRead + Unpin> FrameReader<R> {
         ]);
 
         if length > MAX_PAYLOAD_SIZE {
+            log::error!(
+                "CORRUPT FRAME HEADER: raw={:02x?} stream_id={} type=0x{:02x} length={}",
+                self.header_buf, stream_id, frame_type, length
+            );
             return Err(std::io::Error::new(
                 std::io::ErrorKind::InvalidData,
-                format!("frame payload too large: {} bytes", length),
+                format!("frame payload too large: {} bytes (header={:02x?})", length, self.header_buf),
             ));
         }
 
@@ -144,6 +152,256 @@ impl<R: AsyncRead + Unpin> FrameReader<R> {
     }
 }
 
+// ---------------------------------------------------------------------------
+// TunnelIo: single-owner I/O multiplexer for the TLS tunnel connection
+// ---------------------------------------------------------------------------
+
+/// Events produced by the TunnelIo event loop.
+#[derive(Debug)]
+pub enum TunnelEvent {
+    /// A complete frame was read from the remote side.
+    Frame(Frame),
+    /// The remote side closed the connection (EOF).
+    Eof,
+    /// A read error occurred.
+    ReadError(std::io::Error),
+    /// A write error occurred.
+    WriteError(std::io::Error),
+    /// No frames received for the liveness timeout duration.
+    LivenessTimeout,
+    /// The cancellation token was triggered.
+    Cancelled,
+}
+
+/// Single-owner I/O engine for the tunnel TLS connection.
+///
+/// Owns the TLS stream directly — no `tokio::io::split()`, no mutex.
+/// Uses two priority write queues: ctrl frames (PONG, WINDOW_UPDATE, CLOSE, OPEN)
+/// are ALWAYS written before data frames (DATA, DATA_BACK). This prevents
+/// WINDOW_UPDATE starvation that causes flow control deadlocks.
+pub struct TunnelIo<S> {
+    stream: S,
+    // Read state: accumulate bytes, parse frames incrementally
+    read_buf: Vec<u8>,
+    read_pos: usize,
+    // Write state: dual priority queues
+    ctrl_queue: VecDeque<Vec<u8>>,   // PONG, WINDOW_UPDATE, CLOSE, OPEN — always first
+    data_queue: VecDeque<Vec<u8>>,   // DATA, DATA_BACK — only when ctrl is empty
+    write_offset: usize,             // progress within current frame being written
+    flush_needed: bool,
+}
+
+impl<S: AsyncRead + AsyncWrite + Unpin> TunnelIo<S> {
+    pub fn new(stream: S, initial_data: Vec<u8>) -> Self {
+        let read_pos = initial_data.len();
+        let mut read_buf = initial_data;
+        if read_buf.capacity() < 65536 {
+            read_buf.reserve(65536 - read_buf.len());
+        }
+        Self {
+            stream,
+            read_buf,
+            read_pos,
+            ctrl_queue: VecDeque::new(),
+            data_queue: VecDeque::new(),
+            write_offset: 0,
+            flush_needed: false,
+        }
+    }
+
+    /// Queue a high-priority control frame (PONG, WINDOW_UPDATE, CLOSE, OPEN).
+    pub fn queue_ctrl(&mut self, frame: Vec<u8>) {
+        self.ctrl_queue.push_back(frame);
+    }
+
+    /// Queue a lower-priority data frame (DATA, DATA_BACK).
+    pub fn queue_data(&mut self, frame: Vec<u8>) {
+        self.data_queue.push_back(frame);
+    }
+
+    /// Try to parse a complete frame from the read buffer.
+    pub fn try_parse_frame(&mut self) -> Option<Result<Frame, std::io::Error>> {
+        if self.read_pos < FRAME_HEADER_SIZE {
+            return None;
+        }
+
+        let stream_id = u32::from_be_bytes([
+            self.read_buf[0], self.read_buf[1], self.read_buf[2], self.read_buf[3],
+        ]);
+        let frame_type = self.read_buf[4];
+        let length = u32::from_be_bytes([
+            self.read_buf[5], self.read_buf[6], self.read_buf[7], self.read_buf[8],
+        ]);
+
+        if length > MAX_PAYLOAD_SIZE {
+            let header = [
+                self.read_buf[0], self.read_buf[1], self.read_buf[2], self.read_buf[3],
+                self.read_buf[4], self.read_buf[5], self.read_buf[6], self.read_buf[7],
+                self.read_buf[8],
+            ];
+            log::error!(
+                "CORRUPT FRAME HEADER: raw={:02x?} stream_id={} type=0x{:02x} length={}",
+                header, stream_id, frame_type, length
+            );
+            return Some(Err(std::io::Error::new(
+                std::io::ErrorKind::InvalidData,
+                format!("frame payload too large: {} bytes (header={:02x?})", length, header),
+            )));
+        }
+
+        let total_frame_size = FRAME_HEADER_SIZE + length as usize;
+        if self.read_pos < total_frame_size {
+            return None;
+        }
+
+        let payload = self.read_buf[FRAME_HEADER_SIZE..total_frame_size].to_vec();
+        self.read_buf.drain(..total_frame_size);
+        self.read_pos -= total_frame_size;
+
+        Some(Ok(Frame { stream_id, frame_type, payload }))
+    }
+
+    fn has_write_work(&self) -> bool {
+        !self.ctrl_queue.is_empty() || !self.data_queue.is_empty()
+    }
+
+    /// Poll-based I/O step. Returns Ready on events, Pending when idle.
+    ///
+    /// Order: write(ctrl→data) → flush → read → channels → timers
+    pub fn poll_step(
+        &mut self,
+        cx: &mut Context<'_>,
+        ctrl_rx: &mut tokio::sync::mpsc::Receiver<Vec<u8>>,
+        data_rx: &mut tokio::sync::mpsc::Receiver<Vec<u8>>,
+        liveness_deadline: &mut Pin<Box<tokio::time::Sleep>>,
+        cancel_token: &tokio_util::sync::CancellationToken,
+    ) -> Poll<TunnelEvent> {
+        // 1. WRITE: drain ctrl queue first, then data queue.
+        //    TLS poll_write writes plaintext to session buffer (always Ready).
+        //    Batch up to 16 frames per poll cycle.
+        let mut writes = 0;
+        while self.has_write_work() && writes < 16 {
+            // Determine which queue to write from and the frame data.
+            // We access the queues via raw pointers to avoid borrow conflicts with self.stream.
+            let from_ctrl = !self.ctrl_queue.is_empty();
+            let frame_ptr: *const Vec<u8> = if from_ctrl {
+                self.ctrl_queue.front().unwrap()
+            } else {
+                self.data_queue.front().unwrap()
+            };
+            // SAFETY: the frame is not modified while we hold the pointer — poll_write
+            // only writes to self.stream, and advance_write only runs after poll_write returns.
+            let frame = unsafe { &*frame_ptr };
+            let remaining = &frame[self.write_offset..];
+
+            match Pin::new(&mut self.stream).poll_write(cx, remaining) {
+                Poll::Ready(Ok(0)) => {
+                    return Poll::Ready(TunnelEvent::WriteError(
+                        std::io::Error::new(std::io::ErrorKind::WriteZero, "write zero"),
+                    ));
+                }
+                Poll::Ready(Ok(n)) => {
+                    self.write_offset += n;
+                    self.flush_needed = true;
+                    if self.write_offset >= frame.len() {
+                        if from_ctrl { self.ctrl_queue.pop_front(); }
+                        else { self.data_queue.pop_front(); }
+                        self.write_offset = 0;
+                        writes += 1;
+                    }
+                }
+                Poll::Ready(Err(e)) => return Poll::Ready(TunnelEvent::WriteError(e)),
+                Poll::Pending => break,
+            }
+        }
+
+        // 2. FLUSH: push encrypted data from TLS session to TCP.
+        if self.flush_needed {
+            match Pin::new(&mut self.stream).poll_flush(cx) {
+                Poll::Ready(Ok(())) => self.flush_needed = false,
+                Poll::Ready(Err(e)) => return Poll::Ready(TunnelEvent::WriteError(e)),
+                Poll::Pending => {} // TCP waker will notify us
+            }
+        }
+
+        // 3. READ: drain stream until Pending to ensure the TCP waker is always registered.
+        //    Without this loop, a Ready return with partial frame data would consume
+        //    the waker without re-registering it, causing the task to sleep until a
+        //    timer or channel wakes it (potentially 15+ seconds of lost reads).
+        loop {
+            if self.read_buf.len() < self.read_pos + 32768 {
+                self.read_buf.resize(self.read_pos + 32768, 0);
+            }
+            let mut rbuf = ReadBuf::new(&mut self.read_buf[self.read_pos..]);
+            match Pin::new(&mut self.stream).poll_read(cx, &mut rbuf) {
+                Poll::Ready(Ok(())) => {
+                    let n = rbuf.filled().len();
+                    if n == 0 {
+                        return Poll::Ready(TunnelEvent::Eof);
+                    }
+                    self.read_pos += n;
+                    if let Some(result) = self.try_parse_frame() {
+                        return match result {
+                            Ok(frame) => Poll::Ready(TunnelEvent::Frame(frame)),
+                            Err(e) => Poll::Ready(TunnelEvent::ReadError(e)),
+                        };
+                    }
+                    // Partial data — loop to call poll_read again so the TCP
+                    // waker is re-registered when it finally returns Pending.
+                }
+                Poll::Ready(Err(e)) => return Poll::Ready(TunnelEvent::ReadError(e)),
+                Poll::Pending => break,
+            }
+        }
+
+        // 4. CHANNELS: drain ctrl into ctrl_queue, data into data_queue.
+        let mut got_new = false;
+        loop {
+            match ctrl_rx.poll_recv(cx) {
+                Poll::Ready(Some(frame)) => { self.ctrl_queue.push_back(frame); got_new = true; }
+                Poll::Ready(None) => {
+                    return Poll::Ready(TunnelEvent::WriteError(
+                        std::io::Error::new(std::io::ErrorKind::BrokenPipe, "ctrl channel closed"),
+                    ));
+                }
+                Poll::Pending => break,
+            }
+        }
+        loop {
+            match data_rx.poll_recv(cx) {
+                Poll::Ready(Some(frame)) => { self.data_queue.push_back(frame); got_new = true; }
+                Poll::Ready(None) => {
+                    return Poll::Ready(TunnelEvent::WriteError(
+                        std::io::Error::new(std::io::ErrorKind::BrokenPipe, "data channel closed"),
+                    ));
+                }
+                Poll::Pending => break,
+            }
+        }
+
+        // 5. TIMERS
+        if liveness_deadline.as_mut().poll(cx).is_ready() {
+            return Poll::Ready(TunnelEvent::LivenessTimeout);
+        }
+        if cancel_token.is_cancelled() {
+            return Poll::Ready(TunnelEvent::Cancelled);
+        }
+
+        // 6. SELF-WAKE: only when we have frames AND flush is done.
+        //    If flush is pending, the TCP write-readiness waker will notify us.
+        //    If we got new channel frames, wake to write them.
+        if got_new || (!self.flush_needed && self.has_write_work()) {
+            cx.waker().wake_by_ref();
+        }
+
+        Poll::Pending
+    }
+
+    pub fn into_inner(self) -> S {
+        self.stream
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/remoteingress',
-  version: '4.7.0',
+  version: '4.8.2',
   description: 'Edge ingress tunnel for DcRouter - accepts incoming TCP connections at network edge and tunnels them to DcRouter SmartProxy preserving client IP via PROXY protocol v1.'
 }

ts/classes.remoteingressedge.ts

@@ -83,8 +83,10 @@ export class RemoteIngressEdge extends EventEmitter {
     this.bridge.on('management:tunnelConnected', () => {
       this.emit('tunnelConnected');
     });
-    this.bridge.on('management:tunnelDisconnected', () => {
-      this.emit('tunnelDisconnected');
+    this.bridge.on('management:tunnelDisconnected', (data: { reason?: string }) => {
+      const reason = data?.reason ?? 'unknown';
+      console.log(`[RemoteIngressEdge] Tunnel disconnected: ${reason}`);
+      this.emit('tunnelDisconnected', data);
     });
     this.bridge.on('management:publicIpDiscovered', (data: { ip: string }) => {
       this.emit('publicIpDiscovered', data);

ts/classes.remoteingresshub.ts

@@ -93,7 +93,9 @@ export class RemoteIngressHub extends EventEmitter {
     this.bridge.on('management:edgeConnected', (data: { edgeId: string; peerAddr: string }) => {
       this.emit('edgeConnected', data);
     });
-    this.bridge.on('management:edgeDisconnected', (data: { edgeId: string }) => {
+    this.bridge.on('management:edgeDisconnected', (data: { edgeId: string; reason?: string }) => {
+      const reason = data?.reason ?? 'unknown';
+      console.log(`[RemoteIngressHub] Edge ${data.edgeId} disconnected: ${reason}`);
       this.emit('edgeDisconnected', data);
     });
     this.bridge.on('management:streamOpened', (data: { edgeId: string; streamId: number }) => {