fix: Resolve SSE reading deadlocks in Stdio proxies

server/src/proxy.rs

@@ -69,7 +69,14 @@ pub fn run_proxy(target_url: &str) -> Result<bool, Box<dyn std::error::Error + S
                     let mut is_message = false;
                     let mut is_endpoint = false;
                     
-                    while let Ok(bytes) = reader.read_line(&mut line).await {
+                    loop {
+                        tokio::select! {
+                            _ = shutdown_rx.recv() => {
+                                return Ok(false);
+                            }
+                            res = reader.read_line(&mut line) => {
+                                match res {
+                                    Ok(bytes) => {
                                         if bytes == 0 { break; }
                                         let trimmed = line.trim();
                                         if trimmed.starts_with("event: message") {
@@ -91,6 +98,11 @@ pub fn run_proxy(target_url: &str) -> Result<bool, Box<dyn std::error::Error + S
                                         }
                                         line.clear();
                                     }
+                                    Err(_) => break,
+                                }
+                            }
+                        }
+                    }
                     *post_url.write().await = String::new();
                     return Ok(true);
                 }

stub/src/main.rs

@@ -87,7 +87,14 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                     let mut is_message = false;
                     let mut is_endpoint = false;
                     
-                    while let Ok(bytes) = reader.read_line(&mut line).await {
+                    loop {
+                        tokio::select! {
+                            _ = shutdown_rx.recv() => {
+                                return Ok(()); // Stdin closed, exit entirely
+                            }
+                            res = reader.read_line(&mut line) => {
+                                match res {
+                                    Ok(bytes) => {
                                         if bytes == 0 { break; }
                                         let trimmed = line.trim();
                                         if trimmed.starts_with("event: message") {
@@ -109,6 +116,11 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                                         }
                                         line.clear();
                                     }
+                                    Err(_) => break,
+                                }
+                            }
+                        }
+                    }
                     *post_url.write().await = String::new();
                     tokio::time::sleep(tokio::time::Duration::from_millis(500)).await;
                 }