fix: controller is already closed trpc subscription observable error (#743)

packages/api/src/router/widgets/media-server.ts

@@ -25,15 +25,21 @@ export const mediaServerRouter = createTRPCRouter({
     .unstable_concat(createManyIntegrationMiddleware("jellyfin", "plex"))
     .subscription(({ ctx }) => {
       return observable<{ integrationId: string; data: StreamSession[] }>((emit) => {
+        let isConnectionClosed = false;
+
         for (const integration of ctx.integrations) {
           const channel = createItemAndIntegrationChannel<StreamSession[]>("mediaServer", integration.id);
           void channel.subscribeAsync((sessions) => {
+            if (isConnectionClosed) return;
             emit.next({
               integrationId: integration.id,
               data: sessions,
             });
           });
         }
+        return () => {
+          isConnectionClosed = true;
+        };
       });
     }),
 });