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import { AppState, AppStateStatus } from "react-native";
export type WSStatus =
| "idle"
| "connecting"
| "connected"
| "reconnecting"
| "closed";
export interface WSMessage {
type: string;
channel?: string;
payload?: any;
data?: unknown;
}
export interface UseWebSocketOptions {
url?: string;
getToken?: () => Promise<string | null>;
}
const MAX_RECONNECT_DELAY = 30_000;
export const useWebSocketListener = (options?: UseWebSocketOptions) => {
const { url, getToken } = options || {};
const wsRef = useRef<WebSocket | null>(null);
const reconnectTimerRef = useRef<NodeJS.Timeout | null>(null);
const reconnectAttemptRef = useRef(0);
const shouldReconnectRef = useRef(true);
const appStateRef = useRef<AppStateStatus>("active");
const connectRef = useRef<() => Promise<void>>(async () => {});
const [status, setStatus] = useState<WSStatus>("idle");
const [lastMessage, setLastMessage] = useState<WSMessage | null>(null);
const clearReconnectTimer = () => {
if (reconnectTimerRef.current) {
clearTimeout(reconnectTimerRef.current);
reconnectTimerRef.current = null;
}
};
const scheduleReconnect = useCallback(() => {
Iif (!shouldReconnectRef.current) return;
Iif (appStateRef.current !== "active") return;
reconnectAttemptRef.current += 1;
const delay = Math.min(
1000 * Math.pow(2, reconnectAttemptRef.current),
MAX_RECONNECT_DELAY,
);
setStatus("reconnecting");
reconnectTimerRef.current = setTimeout(() => {
connectRef.current();
}, delay);
}, []);
const disconnect = useCallback(() => {
shouldReconnectRef.current = false;
clearReconnectTimer();
if (wsRef.current) {
wsRef.current.close();
wsRef.current = null;
}
setStatus("closed");
}, []);
connectRef.current = async () => {
try {
const targetUrl = url || (process.env as any).FLASH_WS_URL;
Iif (!targetUrl) {
console.warn("[WS] No WebSocket URL provided, skip connect");
return;
}
setStatus((prev) => (prev === "connected" ? prev : "connecting"));
let tokenParam = "";
if (getToken) {
const token = await getToken();
Eif (token) {
tokenParam = `?token=${encodeURIComponent(token)}`;
}
}
Iif (!shouldReconnectRef.current) return;
const ws = new WebSocket(`${targetUrl}${tokenParam}`);
wsRef.current = ws;
ws.onopen = () => {
reconnectAttemptRef.current = 0;
setStatus("connected");
};
ws.onmessage = (event) => {
try {
const data = JSON.parse(event.data);
setLastMessage(data);
} catch {
console.warn("[WS] Non-JSON message:", event.data);
}
};
ws.onerror = (e) => {
console.warn("[WS] Error", e);
};
ws.onclose = () => {
wsRef.current = null;
setStatus("closed");
scheduleReconnect();
};
} catch (err) {
console.error("[WS] Connect error", err);
scheduleReconnect();
}
};
useEffect(() => {
const sub = AppState.addEventListener("change", (nextState) => {
appStateRef.current = nextState;
if (nextState === "active") {
Iif (!wsRef.current && shouldReconnectRef.current) {
connectRef.current();
}
}
if (nextState === "background") {
wsRef.current?.close();
}
});
return () => sub.remove();
}, []);
useEffect(() => {
shouldReconnectRef.current = true;
connectRef.current();
return () => {
disconnect();
};
}, [disconnect]);
return {
status,
connected: status === "connected",
lastMessage,
send: (data: WSMessage) => {
Eif (wsRef.current?.readyState === WebSocket.OPEN) {
wsRef.current.send(JSON.stringify(data));
}
},
disconnect,
};
};
|