Handle socket closed events.

src/modules/socket/middleware.ts

@@ -77,6 +77,9 @@ function makeSocketFactory(
     // Bind websocket handlers.
     socket.onopen = onOpen;
     socket.onclose = onClose;
+    socket.onerror = (err) => {
+      console.log("WebSocket error:", err);
+    };
     socket.onmessage = onMessage;
 
     return socket;
@@ -106,10 +109,15 @@ function makeMiddleware(
         if (socket !== undefined) {
           socket.close();
           socket = undefined;
-          console.log("WebSocket closed.");
+          console.log("WebSocket closing.");
         } else {
-          console.log("Ignoring socketClose action, socket is already closed.");
+          console.log(
+            "Ignoring socketClose action, socket is already closing or closed."
+          );
         }
+      } else if (socketClosed.match(action)) {
+        console.log("WebSocket closed.");
+        socket = undefined;
       } else if (socket !== undefined) {
         for (const middleware of messageMiddlewares) {
           middleware.handleAction(socketMessageSender(socket), action);