v4.5.8

changelog.md

@@ -1,5 +1,31 @@
 # Changelog
 
+## 2026-03-16 - 4.5.8 - fix(remoteingress-core)
+ensure upstream writes cancel promptly and reliably deliver CLOSE_BACK frames
+
+- listen for stream cancellation while waiting on upstream write timeouts so FRAME_CLOSE does not block for up to 60 seconds
+- replace try_send with send().await when emitting CLOSE_BACK frames to avoid silently dropping close notifications when the data channel is full
+
+## 2026-03-16 - 4.5.7 - fix(remoteingress-core)
+improve tunnel reconnect and frame write efficiency
+
+- Reuse the TLS connector across edge reconnections to preserve session resumption state and reduce reconnect latency.
+- Buffer hub and edge frame writes to coalesce small control and data frames into fewer TLS records and syscalls while still flushing each frame promptly.
+
+## 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
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/remoteingress",
-  "version": "4.5.4",
+  "version": "4.5.8",
   "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

@@ -194,6 +194,14 @@ async fn edge_main_loop(
     let mut backoff_ms: u64 = 1000;
     let max_backoff_ms: u64 = 30000;
 
+    // Build TLS config ONCE outside the reconnect loop — preserves session
+    // cache across reconnections for TLS session resumption (saves 1 RTT).
+    let tls_config = rustls::ClientConfig::builder()
+        .dangerous()
+        .with_custom_certificate_verifier(Arc::new(NoCertVerifier))
+        .with_no_client_auth();
+    let connector = TlsConnector::from(Arc::new(tls_config));
+
     loop {
         // Create a per-connection child token
         let connection_token = cancel_token.child_token();
@@ -209,6 +217,7 @@ async fn edge_main_loop(
             &listen_ports,
             &mut shutdown_rx,
             &connection_token,
+            &connector,
         )
         .await;
 
@@ -259,18 +268,16 @@ async fn connect_to_hub_and_run(
     listen_ports: &Arc<RwLock<Vec<u16>>>,
     shutdown_rx: &mut mpsc::Receiver<()>,
     connection_token: &CancellationToken,
+    connector: &TlsConnector,
 ) -> EdgeLoopResult {
-    // Build TLS connector that skips cert verification (auth is via secret)
-    let tls_config = rustls::ClientConfig::builder()
-        .dangerous()
-        .with_custom_certificate_verifier(Arc::new(NoCertVerifier))
-        .with_no_client_auth();
-
-    let connector = TlsConnector::from(Arc::new(tls_config));
 
     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;
@@ -374,15 +381,17 @@ async fn connect_to_hub_and_run(
     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 write_half.write_all(&frame_data).await.is_err() {
-                                break;
-                            }
+                            if writer.write_all(&frame_data).await.is_err() { break; }
+                            if writer.flush().await.is_err() { break; }
                         }
                         None => break,
                     }
@@ -390,9 +399,8 @@ async fn connect_to_hub_and_run(
                 data = tunnel_data_rx.recv() => {
                     match data {
                         Some(frame_data) => {
-                            if write_half.write_all(&frame_data).await.is_err() {
-                                break;
-                            }
+                            if writer.write_all(&frame_data).await.is_err() { break; }
+                            if writer.flush().await.is_err() { break; }
                         }
                         None => break,
                     }
@@ -665,7 +673,7 @@ 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! {
@@ -741,18 +749,32 @@ async fn handle_client_connection(
         }
     }
 
-    // Send CLOSE frame via DATA channel (must arrive AFTER last DATA for this stream)
+    // 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_data_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);
@@ -379,15 +381,17 @@ async fn handle_edge_connection(
     let frame_writer_tx = ctrl_tx.clone();
     let writer_token = edge_token.clone();
     let 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 = ctrl_rx.recv() => {
                     match ctrl {
                         Some(frame_data) => {
-                            if write_half.write_all(&frame_data).await.is_err() {
-                                break;
-                            }
+                            if writer.write_all(&frame_data).await.is_err() { break; }
+                            if writer.flush().await.is_err() { break; }
                         }
                         None => break,
                     }
@@ -395,9 +399,8 @@ async fn handle_edge_connection(
                 data = data_rx.recv() => {
                     match data {
                         Some(frame_data) => {
-                            if write_half.write_all(&frame_data).await.is_err() {
-                                break;
-                            }
+                            if writer.write_all(&frame_data).await.is_err() { break; }
+                            if writer.flush().await.is_err() { break; }
                         }
                         None => break,
                     }
@@ -520,6 +523,7 @@ 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) =
@@ -537,10 +541,16 @@ async fn handle_edge_connection(
                                                         match data {
                                                             Some(data) => {
                                                                 let len = data.len() as u32;
-                                                                match tokio::time::timeout(
-                                                                    Duration::from_secs(60),
-                                                                    up_write.write_all(&data),
-                                                                ).await {
+                                                                // Check cancellation alongside the write so we respond
+                                                                // promptly to FRAME_CLOSE instead of blocking up to 60s.
+                                                                let write_result = tokio::select! {
+                                                                    r = tokio::time::timeout(
+                                                                        Duration::from_secs(60),
+                                                                        up_write.write_all(&data),
+                                                                    ) => r,
+                                                                    _ = writer_token.cancelled() => break,
+                                                                };
+                                                                match write_result {
                                                                     Ok(Ok(())) => {}
                                                                     Ok(Err(_)) => break,
                                                                     Err(_) => {
@@ -615,10 +625,11 @@ async fn handle_edge_connection(
                                             }
                                         }
 
-                                        // Send CLOSE_BACK via DATA channel (must arrive AFTER last DATA_BACK)
+                                        // Send CLOSE_BACK via DATA channel (must arrive AFTER last DATA_BACK).
+                                        // Use send().await to guarantee delivery (try_send silently drops if full).
                                         if !stream_token.is_cancelled() {
                                             let close_frame = encode_frame(stream_id, FRAME_CLOSE_BACK, &[]);
-                                            let _ = data_writer_tx.try_send(close_frame);
+                                            let _ = data_writer_tx.send(close_frame).await;
                                         }
 
                                         writer_for_edge_data.abort();
@@ -628,10 +639,11 @@ async fn handle_edge_connection(
 
                                     if let Err(e) = result {
                                         log::error!("Stream {} error: {}", stream_id, e);
-                                        // Send CLOSE_BACK via DATA channel on error (must arrive after any DATA_BACK)
+                                        // Send CLOSE_BACK via DATA channel on error (must arrive after any DATA_BACK).
+                                        // Use send().await to guarantee delivery.
                                         if !stream_token.is_cancelled() {
                                             let close_frame = encode_frame(stream_id, FRAME_CLOSE_BACK, &[]);
-                                            let _ = data_writer_tx.try_send(close_frame);
+                                            let _ = data_writer_tx.send(close_frame).await;
                                         }
                                     }
 

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/remoteingress',
-  version: '4.5.4',
+  version: '4.5.8',
   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.'
 }