File size: 8,206 Bytes
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import { useLiveAlertStore } from '../stores/useLiveAlertStore';
import type { LiveStreamTransaction } from '../stores/useLiveAlertStore';
function getWebSocketUrl(): string {
if (typeof window === 'undefined') return '';
if (import.meta.env.VITE_WS_URL) {
return import.meta.env.VITE_WS_URL.replace(/\/+$/, '') + '/ws/telemetry';
}
if (import.meta.env.VITE_API_URL) {
const apiUrl = import.meta.env.VITE_API_URL;
const wsProto = apiUrl.startsWith('https') ? 'wss:' : 'ws:';
const host = apiUrl.replace(/^https?:\/\//, '').replace(/\/+$/, '');
return `${wsProto}//${host}/ws/telemetry`;
}
// Local development fallback
if (window.location.port === '5173' || window.location.port === '3000' || window.location.hostname === 'localhost' || window.location.hostname === '127.0.0.1') {
const isHttps = window.location.protocol === 'https:';
const protocol = isHttps ? 'wss:' : 'ws:';
return `${protocol}//127.0.0.1:8000/ws/telemetry`;
}
if (window.location.hostname.includes('hf.space')) {
const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
return `${protocol}//${window.location.host}/ws/telemetry`;
}
// Production fallback to live Hugging Face Spaces backend
return 'wss://yusufcalisir-collaborative-fraud-intelligence-simulator.hf.space/ws/telemetry';
}
/**
* Global Real-Time WebSocket Hook for Platform Telemetry and Fraud Alert Streaming.
* Implements non-abandoning exponential backoff reconnection, dynamic RTT latency measurement,
* and seamless fallback transition without permanent dead-ends.
*/
export function useRealTimeFraudStream() {
const {
status,
streamSource,
streamProvenance,
latencyMs,
totalStreamedTransactions,
recentTransactions,
activeAlertToasts,
setStatus,
setStreamSource,
setLatencyMs,
pushStreamEvent,
dismissToast,
clearAllToasts,
} = useLiveAlertStore();
const wsRef = useRef<WebSocket | null>(null);
const reconnectTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
const pingIntervalRef = useRef<ReturnType<typeof setInterval> | null>(null);
const reconnectAttemptsRef = useRef<number>(0);
const lastPingTimestampRef = useRef<number>(0);
useEffect(() => {
let isMounted = true;
function scheduleReconnect() {
if (!isMounted) return;
if (reconnectTimeoutRef.current) {
clearTimeout(reconnectTimeoutRef.current);
}
reconnectAttemptsRef.current += 1;
// Exponential backoff with jitter: 1.5s, 2.25s, 3.4s, 5.0s ... capped at 15s
const baseDelay = Math.min(1000 * Math.pow(1.5, reconnectAttemptsRef.current), 15000);
const jitter = Math.random() * 500;
const delay = Math.round(baseDelay + jitter);
// On disconnect, truthfully remain disconnected. Never silently generate fake browser transactions.
setStatus('disconnected');
// Reconnect schedule
reconnectTimeoutRef.current = setTimeout(() => {
if (isMounted) {
connect();
}
}, delay);
}
function sendPing(ws: WebSocket) {
if (ws.readyState === 1 || (typeof WebSocket !== 'undefined' && ws.readyState === WebSocket.OPEN)) {
lastPingTimestampRef.current = performance.now();
try {
ws.send(JSON.stringify({ type: 'ping', timestamp: Date.now() }));
} catch {
// Socket might have closed concurrently
}
}
}
function connect() {
if (!isMounted) return;
// Clean up previous socket if still lingering
if (wsRef.current) {
try {
wsRef.current.onopen = null;
wsRef.current.onmessage = null;
wsRef.current.onerror = null;
wsRef.current.onclose = null;
if (wsRef.current.readyState === WebSocket.OPEN || wsRef.current.readyState === WebSocket.CONNECTING) {
wsRef.current.close(1000, 'Reconnecting');
}
} catch {
// Ignore
}
wsRef.current = null;
}
const url = getWebSocketUrl();
if (!url) {
scheduleReconnect();
return;
}
setStatus('connecting');
try {
const ws = new WebSocket(url);
wsRef.current = ws;
ws.onopen = () => {
if (!isMounted) return;
reconnectAttemptsRef.current = 0;
setStatus('connected');
// Real round-trip latency probe
sendPing(ws);
// Periodic heartbeat ping every 10 seconds to maintain real dynamic latency telemetry
if (pingIntervalRef.current) clearInterval(pingIntervalRef.current);
pingIntervalRef.current = setInterval(() => {
if (isMounted && wsRef.current) {
sendPing(wsRef.current);
}
}, 10000);
};
ws.onmessage = (event) => {
if (!isMounted) return;
try {
const data = JSON.parse(event.data);
const eventType = (data.event_type || data.event || '').toUpperCase();
// Calculate real round-trip latency on PONG response from backend
if (eventType === 'PONG') {
if (lastPingTimestampRef.current > 0) {
const elapsed = performance.now() - lastPingTimestampRef.current;
if (elapsed > 0 && elapsed < 30000) {
setLatencyMs(Math.max(0.5, Math.round(elapsed * 10) / 10));
}
}
return;
}
if (eventType === 'CONNECTED') {
setStatus('connected');
sendPing(ws);
return;
}
if (data.stream_type) {
setStreamSource(data.stream_type, data.provenance);
}
if (data.payload && (eventType === 'ALERT_TRIGGERED' || eventType === 'TRANSACTION_SCORED')) {
pushStreamEvent(data.payload as LiveStreamTransaction);
}
} catch (e) {
console.warn('[WebSocket Parsing Error]', e);
}
};
ws.onerror = () => {
if (!isMounted) return;
try {
if (ws.readyState === WebSocket.OPEN || ws.readyState === WebSocket.CONNECTING) {
ws.close();
}
} catch {
// Socket already terminating
}
};
ws.onclose = () => {
if (!isMounted) return;
if (pingIntervalRef.current) {
clearInterval(pingIntervalRef.current);
pingIntervalRef.current = null;
}
scheduleReconnect();
};
} catch {
scheduleReconnect();
}
}
connect();
return () => {
isMounted = false;
if (pingIntervalRef.current) {
clearInterval(pingIntervalRef.current);
pingIntervalRef.current = null;
}
if (reconnectTimeoutRef.current) {
clearTimeout(reconnectTimeoutRef.current);
reconnectTimeoutRef.current = null;
}
if (wsRef.current) {
const socket = wsRef.current;
socket.onopen = null;
socket.onmessage = null;
socket.onerror = null;
socket.onclose = null;
try {
if (socket.readyState === 1 || (typeof WebSocket !== 'undefined' && socket.readyState === WebSocket.OPEN)) {
socket.close(1000, 'Component unmounted');
} else if (socket.readyState === 0 || (typeof WebSocket !== 'undefined' && socket.readyState === WebSocket.CONNECTING)) {
socket.onopen = () => {
try {
socket.close(1000, 'Unmounted while connecting');
} catch {
// Ignore socket closure errors
}
};
}
} catch {
// Socket already closed or terminating
}
wsRef.current = null;
}
};
}, [pushStreamEvent, setLatencyMs, setStatus, setStreamSource]);
return {
status,
streamSource,
streamProvenance,
latencyMs,
totalStreamedTransactions,
recentTransactions,
activeAlertToasts,
dismissToast,
clearAllToasts,
};
}
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