autobahn: don't panic in server

Signed-off-by: Alexey Galakhov <agalakhov@snapview.de>

examples/autobahn-server.rs

@@ -2,25 +2,34 @@ use async_std::net::{SocketAddr, TcpListener, TcpStream};
 use async_tungstenite::accept_async;
 use futures::{SinkExt, StreamExt};
 use log::*;
+use tungstenite::Result;
 
 async fn accept_connection(peer: SocketAddr, stream: TcpStream) {
+    if let Err(err) = handle_connection(peer, stream).await {
+        error!("Error processing connection: {}", err);
+    }
+}
+
+async fn handle_connection(peer: SocketAddr, stream: TcpStream) -> Result<()> {
     let mut ws_stream = accept_async(stream).await.expect("Failed to accept");
 
     info!("New WebSocket connection: {}", peer);
 
     while let Some(msg) = ws_stream.next().await {
-        let msg = msg.expect("Failed to get request");
+        let msg = msg?;
         if msg.is_text() || msg.is_binary() {
-            ws_stream.send(msg).await.expect("Failed to send response");
+            ws_stream.send(msg).await?;
         }
     }
+
+    Ok(())
 }
 
 async fn run() {
     env_logger::init();
 
     let addr = "127.0.0.1:9002";
-    let listener = TcpListener::bind(&addr).await.unwrap();
+    let listener = TcpListener::bind(&addr).await.expect("Can't listen");
     info!("Listening on: {}", addr);
 
     while let Ok((stream, _)) = listener.accept().await {