v4.4.1

changelog.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 2026-03-15 - 4.4.1 - fix(remoteingress-core)
+prevent stream data loss by applying backpressure and closing saturated channels
+
+- replace non-blocking frame writes with awaited sends in per-stream tasks so large transfers respect backpressure instead of dropping data
+- close and remove streams when back-channel or data channels fill up to avoid TCP stream corruption from silently dropped frames
+
 ## 2026-03-03 - 4.4.0 - feat(remoteingress)
 add heartbeat PING/PONG and liveness timeouts; implement fast-reconnect/backoff reset and JS crash-recovery auto-restart
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/remoteingress",
-  "version": "4.4.0",
+  "version": "4.4.1",
   "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

@@ -407,11 +407,14 @@ async fn connect_to_hub_and_run(
 
                         match frame.frame_type {
                             FRAME_DATA_BACK => {
-                                // A1: Non-blocking send to prevent head-of-line blocking
+                                // Non-blocking send to prevent head-of-line blocking in the main dispatch loop.
-                                let writers = client_writers.lock().await;
+                                // If the per-stream channel is full, close the stream rather than silently
+                                // dropping data (which would corrupt the TCP stream).
+                                let mut writers = client_writers.lock().await;
                                 if let Some(tx) = writers.get(&frame.stream_id) {
                                     if tx.try_send(frame.payload).is_err() {
-                                        log::warn!("Stream {} back-channel full, dropping frame", frame.stream_id);
+                                        log::warn!("Stream {} back-channel full, closing stream to prevent data corruption", frame.stream_id);
+                                        writers.remove(&frame.stream_id);
                                     }
                                 }
                             }
@@ -635,9 +638,11 @@ async fn handle_client_connection(
                     Ok(0) => break,
                     Ok(n) => {
                         let data_frame = encode_frame(stream_id, FRAME_DATA, &buf[..n]);
-                        // A5: Use try_send to avoid blocking if writer channel is full
+                        // Use send().await for backpressure — this is a per-stream task so
-                        if tunnel_writer_tx.try_send(data_frame).is_err() {
+                        // blocking only stalls this stream, not others. Prevents data loss
-                            log::warn!("Stream {} tunnel writer full, closing", stream_id);
+                        // for large transfers (e.g. 352MB Docker layers).
+                        if tunnel_writer_tx.send(data_frame).await.is_err() {
+                            log::warn!("Stream {} tunnel writer closed, closing", stream_id);
                             break;
                         }
                     }

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

@@ -520,9 +520,11 @@ async fn handle_edge_connection(
                                                         Ok(n) => {
                                                             let frame =
                                                                 encode_frame(stream_id, FRAME_DATA_BACK, &buf[..n]);
-                                                            // A5: Use try_send to avoid blocking if writer channel is full
+                                                            // Use send().await for backpressure — this is a per-stream task so
-                                                            if writer_tx.try_send(frame).is_err() {
+                                                            // blocking only stalls this stream, not others. Prevents data loss
-                                                                log::warn!("Stream {} writer channel full, closing", stream_id);
+                                                            // for large transfers (e.g. 352MB Docker layers).
+                                                            if writer_tx.send(frame).await.is_err() {
+                                                                log::warn!("Stream {} writer channel closed, closing", stream_id);
                                                                 break;
                                                             }
                                                         }
@@ -567,11 +569,16 @@ async fn handle_edge_connection(
                                 });
                             }
                             FRAME_DATA => {
-                                // A1: Non-blocking send to prevent head-of-line blocking
+                                // Non-blocking send to prevent head-of-line blocking in the main dispatch loop.
-                                let s = streams.lock().await;
+                                // If the per-stream channel is full, close the stream rather than silently
+                                // dropping data (which would corrupt the TCP stream).
+                                let mut s = streams.lock().await;
                                 if let Some((tx, _)) = s.get(&frame.stream_id) {
                                     if tx.try_send(frame.payload).is_err() {
-                                        log::warn!("Stream {} data channel full, dropping frame", frame.stream_id);
+                                        log::warn!("Stream {} data channel full, closing stream to prevent data corruption", frame.stream_id);
+                                        if let Some((_, token)) = s.remove(&frame.stream_id) {
+                                            token.cancel();
+                                        }
                                     }
                                 }
                             }

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@serve.zone/remoteingress',
-  version: '4.4.0',
+  version: '4.4.1',
   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.'
 }