v4.5.6

changelog.md

@@ -1,5 +1,26 @@
 # Changelog
 
+## 2026-03-16 - 4.5.6 - fix(remoteingress-core)
+disable Nagle's algorithm on edge, hub, and upstream TCP sockets to reduce control-frame latency
+
+- Enable TCP_NODELAY on the edge connection to the hub for faster PING/PONG and WINDOW_UPDATE delivery
+- Apply TCP_NODELAY on accepted hub streams before TLS handling
+- Enable TCP_NODELAY on SmartProxy upstream connections before sending the PROXY header
+
+## 2026-03-16 - 4.5.5 - fix(remoteingress-core)
+wait for hub-to-client draining before cleanup and reliably send close frames
+
+- switch CLOSE frame delivery on the data channel from try_send to send().await to avoid dropping it when the channel is full
+- delay stream cleanup until the hub-to-client task finishes or times out so large downstream responses continue after upload EOF
+- add a bounded 5-minute wait for download draining to prevent premature termination of asymmetric transfers such as git fetch
+
+## 2026-03-15 - 4.5.4 - fix(remoteingress-core)
+preserve stream close ordering and add flow-control stall timeouts
+
+- Send CLOSE and CLOSE_BACK frames on the data channel so they arrive after the final stream data frames.
+- Log and abort stalled upload and download paths when flow-control windows stay empty for 120 seconds.
+- Apply a 60-second timeout when writing buffered stream data to the upstream connection to prevent hung streams.
+
 ## 2026-03-15 - 4.5.3 - fix(remoteingress-core)
 prioritize control frames over data in edge and hub tunnel writers
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/remoteingress",
-  "version": "4.5.3",
+  "version": "4.5.6",
   "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/crates/remoteingress-core/src/edge.rs

@@ -270,7 +270,11 @@ async fn connect_to_hub_and_run(
 
     let addr = format!("{}:{}", config.hub_host, config.hub_port);
     let tcp = match TcpStream::connect(&addr).await {
-        Ok(s) => s,
+        Ok(s) => {
+            // Disable Nagle's algorithm for low-latency control frames (PING/PONG, WINDOW_UPDATE)
+            let _ = s.set_nodelay(true);
+            s
+        }
         Err(e) => {
             log::error!("Failed to connect to hub at {}: {}", addr, e);
             return EdgeLoopResult::Reconnect;
@@ -665,7 +669,7 @@ async fn handle_client_connection(
     // After writing to client TCP, send WINDOW_UPDATE to hub so it can send more
     let hub_to_client_token = client_token.clone();
     let wu_tx = tunnel_ctrl_tx.clone();
-    let hub_to_client = tokio::spawn(async move {
+    let mut hub_to_client = tokio::spawn(async move {
         let mut consumed_since_update: u32 = 0;
         loop {
             tokio::select! {
@@ -703,13 +707,17 @@ async fn handle_client_connection(
     // Task: client -> hub (upload direction) with per-stream flow control
     let mut buf = vec![0u8; 32768];
     loop {
-        // Wait for send window to have capacity
+        // Wait for send window to have capacity (with stall timeout)
         loop {
             let w = send_window.load(Ordering::Acquire);
             if w > 0 { break; }
             tokio::select! {
                 _ = window_notify.notified() => continue,
                 _ = client_token.cancelled() => break,
+                _ = tokio::time::sleep(Duration::from_secs(120)) => {
+                    log::warn!("Stream {} upload stalled (window empty for 120s)", stream_id);
+                    break;
+                }
             }
         }
         if client_token.is_cancelled() { break; }
@@ -737,18 +745,32 @@ async fn handle_client_connection(
         }
     }
 
-    // Send CLOSE frame via control channel (only if not cancelled)
+    // Send CLOSE frame via DATA channel (must arrive AFTER last DATA for this stream).
+    // Use send().await to guarantee delivery (try_send silently drops if channel full).
     if !client_token.is_cancelled() {
         let close_frame = encode_frame(stream_id, FRAME_CLOSE, &[]);
-        let _ = tunnel_ctrl_tx.try_send(close_frame);
+        let _ = tunnel_data_tx.send(close_frame).await;
     }
 
-    // Cleanup
+    // Wait for the download task (hub → client) to finish draining all buffered
+    // response data. Upload EOF just means the client is done sending; the download
+    // must continue until all response data has been written to the client.
+    // This is critical for asymmetric transfers like git fetch (small request, large response).
+    // The download task will exit when:
+    //   - back_rx returns None (back_tx dropped below after await, or hub sent CLOSE_BACK)
+    //   - client_write fails (client disconnected)
+    //   - client_token is cancelled
+    let _ = tokio::time::timeout(
+        Duration::from_secs(300),  // 5 min max wait for download to finish
+        &mut hub_to_client,
+    ).await;
+
+    // Now safe to clean up — download has finished or timed out
     {
         let mut writers = client_writers.lock().await;
         writers.remove(&stream_id);
     }
-    hub_to_client.abort();
+    hub_to_client.abort(); // No-op if already finished; safety net if timeout fired
     let _ = edge_id; // used for logging context
 }
 

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

@@ -298,6 +298,8 @@ async fn handle_edge_connection(
     edge_token: CancellationToken,
     peer_addr: String,
 ) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    // Disable Nagle's algorithm for low-latency control frames (PING/PONG, WINDOW_UPDATE)
+    stream.set_nodelay(true)?;
     let tls_stream = acceptor.accept(stream).await?;
     let (read_half, mut write_half) = tokio::io::split(tls_stream);
     let mut buf_reader = BufReader::new(read_half);
@@ -520,6 +522,7 @@ async fn handle_edge_connection(
                                             format!("connect to SmartProxy {}:{} timed out (10s)", target, dest_port).into()
                                         })??;
 
+                                        upstream.set_nodelay(true)?;
                                         upstream.write_all(proxy_header.as_bytes()).await?;
 
                                         let (mut up_read, mut up_write) =
@@ -537,8 +540,16 @@ async fn handle_edge_connection(
                                                         match data {
                                                             Some(data) => {
                                                                 let len = data.len() as u32;
-                                                                if up_write.write_all(&data).await.is_err() {
-                                                                    break;
+                                                                match tokio::time::timeout(
+                                                                    Duration::from_secs(60),
+                                                                    up_write.write_all(&data),
+                                                                ).await {
+                                                                    Ok(Ok(())) => {}
+                                                                    Ok(Err(_)) => break,
+                                                                    Err(_) => {
+                                                                        log::warn!("Stream {} write to upstream timed out (60s)", stream_id);
+                                                                        break;
+                                                                    }
                                                                 }
                                                                 // Track consumption for flow control
                                                                 consumed_since_update += len;
@@ -568,13 +579,17 @@ async fn handle_edge_connection(
                                         // with per-stream flow control (check send_window before reading)
                                         let mut buf = vec![0u8; 32768];
                                         loop {
-                                            // Wait for send window to have capacity
+                                            // Wait for send window to have capacity (with stall timeout)
                                             loop {
                                                 let w = send_window.load(Ordering::Acquire);
                                                 if w > 0 { break; }
                                                 tokio::select! {
                                                     _ = window_notify.notified() => continue,
                                                     _ = stream_token.cancelled() => break,
+                                                    _ = tokio::time::sleep(Duration::from_secs(120)) => {
+                                                        log::warn!("Stream {} download stalled (window empty for 120s)", stream_id);
+                                                        break;
+                                                    }
                                                 }
                                             }
                                             if stream_token.is_cancelled() { break; }
@@ -603,10 +618,10 @@ async fn handle_edge_connection(
                                             }
                                         }
 
-                                        // Send CLOSE_BACK to edge (only if not cancelled)
+                                        // Send CLOSE_BACK via DATA channel (must arrive AFTER last DATA_BACK)
                                         if !stream_token.is_cancelled() {
                                             let close_frame = encode_frame(stream_id, FRAME_CLOSE_BACK, &[]);
-                                            let _ = writer_tx.try_send(close_frame);
+                                            let _ = data_writer_tx.try_send(close_frame);
                                         }
 
                                         writer_for_edge_data.abort();
@@ -616,10 +631,10 @@ async fn handle_edge_connection(
 
                                     if let Err(e) = result {
                                         log::error!("Stream {} error: {}", stream_id, e);
-                                        // Send CLOSE_BACK on error (only if not cancelled)
+                                        // Send CLOSE_BACK via DATA channel on error (must arrive after any DATA_BACK)
                                         if !stream_token.is_cancelled() {
                                             let close_frame = encode_frame(stream_id, FRAME_CLOSE_BACK, &[]);
-                                            let _ = writer_tx.try_send(close_frame);
+                                            let _ = data_writer_tx.try_send(close_frame);
                                         }
                                     }
 

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/remoteingress',
-  version: '4.5.3',
+  version: '4.5.6',
   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.'
 }