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/**
* React hook for WebSocket connections with automatic reconnection
* and integration with the event bus for cross-component notifications
*/
import { useEffect, useRef, useCallback, useState } from 'react';
import { eventBus } from '../services/eventBus';
import type { WebSocketMessage, DealNotificationData, SystemMessageData } from '../types/websocket';
interface UseWebSocketOptions {
/**
* Whether to automatically connect on mount
* @default true
*/
autoConnect?: boolean;
/**
* Maximum number of reconnection attempts
* @default 5
*/
maxReconnectAttempts?: number;
/**
* Base delay for exponential backoff (in ms)
* @default 1000
*/
reconnectDelay?: number;
/**
* Callback when connection is established
*/
onConnect?: () => void;
/**
* Callback when connection is closed
*/
onDisconnect?: () => void;
/**
* Callback when an error occurs
*/
onError?: (error: Event) => void;
}
interface WebSocketState {
isConnected: boolean;
isConnecting: boolean;
error: string | null;
}
/**
* Hook for managing WebSocket connections to receive real-time notifications
*/
export function useWebSocket(options: UseWebSocketOptions = {}) {
const {
autoConnect = true,
maxReconnectAttempts = 5,
reconnectDelay = 1000,
onConnect,
onDisconnect,
onError,
} = options;
const wsRef = useRef<WebSocket | null>(null);
const reconnectAttemptsRef = useRef(0);
const reconnectTimeoutRef = useRef<NodeJS.Timeout | null>(null);
const shouldReconnectRef = useRef(true);
const [state, setState] = useState<WebSocketState>({
isConnected: false,
isConnecting: false,
error: null,
});
/**
* Get the WebSocket URL based on current location
*/
const getWebSocketUrl = useCallback((): string => {
const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
const host = window.location.host;
// Get access token from cookie
const token = document.cookie
.split('; ')
.find((row) => row.startsWith('accessToken='))
?.split('=')[1];
if (!token) {
throw new Error('No access token found. Please log in.');
}
return `${protocol}//${host}/ws?token=${encodeURIComponent(token)}`;
}, []);
/**
* Handle incoming WebSocket messages
*/
const handleMessage = useCallback((event: MessageEvent) => {
try {
const message = JSON.parse(event.data) as WebSocketMessage;
// Handle different message types
switch (message.type) {
case 'connection-established':
console.log('[WebSocket] Connection established:', message.data);
break;
case 'deal-notification':
// Emit to event bus for components to listen
eventBus.dispatch('notification:deal', message.data as DealNotificationData);
break;
case 'system-message':
// Emit to event bus for system-wide notifications
eventBus.dispatch('notification:system', message.data as SystemMessageData);
break;
case 'error':
console.error('[WebSocket] Server error:', message.data);
eventBus.dispatch('notification:error', message.data);
break;
case 'ping':
// Respond to ping with pong
if (wsRef.current?.readyState === WebSocket.OPEN) {
wsRef.current.send(
JSON.stringify({ type: 'pong', data: {}, timestamp: new Date().toISOString() }),
);
}
break;
case 'pong':
// Server acknowledged our ping
break;
default:
console.warn('[WebSocket] Unknown message type:', message.type);
}
} catch (error) {
console.error('[WebSocket] Failed to parse message:', error);
}
}, []);
/**
* Connect to the WebSocket server
*/
const connect = useCallback(() => {
if (
wsRef.current?.readyState === WebSocket.OPEN ||
wsRef.current?.readyState === WebSocket.CONNECTING
) {
console.warn('[WebSocket] Already connected or connecting');
return;
}
try {
setState((prev) => ({ ...prev, isConnecting: true, error: null }));
const url = getWebSocketUrl();
const ws = new WebSocket(url);
ws.onopen = () => {
console.log('[WebSocket] Connected');
reconnectAttemptsRef.current = 0; // Reset reconnect attempts on successful connection
setState({ isConnected: true, isConnecting: false, error: null });
onConnect?.();
};
ws.onmessage = handleMessage;
ws.onerror = (error) => {
console.error('[WebSocket] Error:', error);
setState((prev) => ({
...prev,
error: 'WebSocket connection error',
}));
onError?.(error);
};
ws.onclose = (event) => {
console.log('[WebSocket] Disconnected:', event.code, event.reason);
setState({
isConnected: false,
isConnecting: false,
error: event.reason || 'Connection closed',
});
onDisconnect?.();
// Attempt to reconnect with exponential backoff
if (shouldReconnectRef.current && reconnectAttemptsRef.current < maxReconnectAttempts) {
const delay = reconnectDelay * Math.pow(2, reconnectAttemptsRef.current);
console.log(
`[WebSocket] Reconnecting in ${delay}ms (attempt ${reconnectAttemptsRef.current + 1}/${maxReconnectAttempts})`,
);
reconnectTimeoutRef.current = setTimeout(() => {
reconnectAttemptsRef.current += 1;
connect();
}, delay);
} else if (reconnectAttemptsRef.current >= maxReconnectAttempts) {
console.error('[WebSocket] Max reconnection attempts reached');
setState((prev) => ({
...prev,
error: 'Failed to reconnect after multiple attempts',
}));
}
};
wsRef.current = ws;
} catch (error) {
console.error('[WebSocket] Failed to connect:', error);
setState({
isConnected: false,
isConnecting: false,
error: error instanceof Error ? error.message : 'Failed to connect',
});
}
}, [
getWebSocketUrl,
handleMessage,
maxReconnectAttempts,
reconnectDelay,
onConnect,
onDisconnect,
onError,
]);
/**
* Disconnect from the WebSocket server
*/
const disconnect = useCallback(() => {
shouldReconnectRef.current = false;
if (reconnectTimeoutRef.current) {
clearTimeout(reconnectTimeoutRef.current);
reconnectTimeoutRef.current = null;
}
if (wsRef.current) {
wsRef.current.close(1000, 'Client disconnecting');
wsRef.current = null;
}
setState({
isConnected: false,
isConnecting: false,
error: null,
});
}, []);
/**
* Send a message to the server
*/
const send = useCallback((message: WebSocketMessage) => {
if (wsRef.current?.readyState === WebSocket.OPEN) {
wsRef.current.send(JSON.stringify(message));
} else {
console.warn('[WebSocket] Cannot send message: not connected');
}
}, []);
/**
* Auto-connect on mount if enabled
*/
useEffect(() => {
if (autoConnect) {
shouldReconnectRef.current = true;
connect();
}
return () => {
disconnect();
};
}, [autoConnect, connect, disconnect]);
return {
...state,
connect,
disconnect,
send,
};
}
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