Real time collaborative whiteboard websocket sync

Hard

Your team is building a real-time collaborative whiteboard. Complete the missing WebSocket logic:

Choose an option below

wsRef.current.onmessage = (event) => {
  const { type, data } = JSON.parse(event.data);
  if (type === 'stroke_start') setStrokes(prev => [...prev, data]);
  if (type === 'stroke_update') {
    setStrokes(prev => prev.map(s => 
      s.id === data.id ? { ...s, points: [...s.points, data.point] } : s
    ));
  }
};
wsRef.current.send(JSON.stringify({ type: 'stroke_end', stroke: currentStroke.current }));
wsRef.current.send(JSON.stringify({ type: 'stroke_start', stroke: currentStroke.current }));
setStrokes(prev => [...prev, point]);

wsRef.current.onmessage = (event) => {
  const { type, data } = JSON.parse(event.data);
  if (type === 'stroke') setStrokes(prev => [...prev, data]);
};
wsRef.current.send(JSON.stringify({ type: 'stroke_update', point }));
wsRef.current.send(JSON.stringify({ type: 'stroke_start', stroke: currentStroke.current }));
currentStroke.current.points.push(point);

wsRef.current.onmessage = (event) => {
  const { type, data } = JSON.parse(event.data);
  if (type === 'stroke_start') setStrokes(prev => [...prev, data]);
  if (type === 'stroke_update') {
    setStrokes(prev => prev.map(s => 
      s.id === data.strokeId ? { ...s, points: [...s.points, data.point] } : s
    ));
  }
};
wsRef.current.send(JSON.stringify({ type: 'stroke_start', stroke: currentStroke.current }));
currentStroke.current.points.push(point);
wsRef.current.send(JSON.stringify({
  type: 'stroke_update',
  strokeId: currentStroke.current.id,
  point
}));

wsRef.current.onmessage = (event) => {
  const { strokes } = JSON.parse(event.data);
  setStrokes(strokes);
};
wsRef.current.send(JSON.stringify({ type: 'update', strokes }));
wsRef.current.send(JSON.stringify({ type: 'start', stroke: currentStroke.current }));
setStrokes(prev => [...prev, point]);

ReactWebsocketsReal timeCollaborative

1function useWhiteboardSync({ roomId }) {
const [strokes, setStrokes] = useState([]);
const [users, setUsers] = useState([]);
const wsRef = useRef(null);
const currentStroke = useRef(null);

useEffect(() => {
  wsRef.current = new WebSocket(`wss://api.example.com/whiteboard/${roomId}`);
  
  // Missing connection logic here
  
  return () => {
    if (currentStroke.current) {
      // Missing cleanup logic here
    }
    wsRef.current?.close();
  };
}, [roomId]);
19
const startStroke = (point) => {
  currentStroke.current = {
    id: Date.now(),
    points: [point],
    userId: currentUser.id
  };
  // Missing broadcast logic here
};
28
const updateStroke = (point) => {
  if (!currentStroke.current) return;
  // Missing update logic here
};
33}

Your team is building a real-time collaborative whiteboard. Complete the missing WebSocket logic:

Hint