Merge commit 'd803bfe2b1fe7f5e219e50ac20d6801a0a58ac75' as 'vendor/ruvector'

vendor/ruvector/examples/rvf/dashboard/src/ws.ts

@@ -0,0 +1,96 @@
+export interface LiveEvent {
+  event_type: string;
+  timestamp: number;
+  data: Record<string, unknown>;
+}
+
+type EventCallback = (event: LiveEvent) => void;
+
+const listeners: EventCallback[] = [];
+let socket: WebSocket | null = null;
+let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
+let reconnectDelay = 1000;
+let intentionalClose = false;
+
+const MAX_RECONNECT_DELAY = 30000;
+const RECONNECT_BACKOFF = 2;
+
+function handleMessage(raw: MessageEvent): void {
+  try {
+    const event = JSON.parse(raw.data as string) as LiveEvent;
+    for (const cb of listeners) {
+      cb(event);
+    }
+  } catch {
+    // Ignore malformed messages
+  }
+}
+
+function scheduleReconnect(): void {
+  if (intentionalClose) return;
+  if (reconnectTimer) return;
+
+  reconnectTimer = setTimeout(() => {
+    reconnectTimer = null;
+    openSocket();
+  }, reconnectDelay);
+
+  reconnectDelay = Math.min(reconnectDelay * RECONNECT_BACKOFF, MAX_RECONNECT_DELAY);
+}
+
+function openSocket(): void {
+  if (socket && (socket.readyState === WebSocket.OPEN || socket.readyState === WebSocket.CONNECTING)) {
+    return;
+  }
+
+  const protocol = location.protocol === 'https:' ? 'wss:' : 'ws:';
+  const url = `${protocol}//${location.host}/ws/live`;
+
+  try {
+    socket = new WebSocket(url);
+  } catch {
+    scheduleReconnect();
+    return;
+  }
+
+  socket.addEventListener('open', () => {
+    reconnectDelay = 1000;
+  });
+
+  socket.addEventListener('message', handleMessage);
+
+  socket.addEventListener('close', () => {
+    socket = null;
+    scheduleReconnect();
+  });
+
+  socket.addEventListener('error', () => {
+    socket?.close();
+  });
+}
+
+export function onEvent(callback: EventCallback): () => void {
+  listeners.push(callback);
+  return () => {
+    const idx = listeners.indexOf(callback);
+    if (idx >= 0) listeners.splice(idx, 1);
+  };
+}
+
+export function connect(): void {
+  intentionalClose = false;
+  reconnectDelay = 1000;
+  openSocket();
+}
+
+export function disconnect(): void {
+  intentionalClose = true;
+  if (reconnectTimer) {
+    clearTimeout(reconnectTimer);
+    reconnectTimer = null;
+  }
+  if (socket) {
+    socket.close();
+    socket = null;
+  }
+}