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/**
* WebSocket client for real-time updates
*/
class WebSocketClient {
constructor(basePath = '') {
this.basePath = basePath;
this.ws = null;
this.reconnectAttempts = 0;
this.maxReconnectAttempts = 10;
this.reconnectDelay = 1000;
this.listeners = new Map();
this.isConnected = false;
this.shouldReconnect = true;
}
connect() {
if (this.ws && (this.ws.readyState === WebSocket.OPEN || this.ws.readyState === WebSocket.CONNECTING)) {
return;
}
this.shouldReconnect = true;
const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
// Ensure basePath ends with '/' for proper URL construction
let basePath = this.basePath || '';
if (basePath && !basePath.endsWith('/')) {
basePath += '/';
}
const wsUrl = `${protocol}//${window.location.host}${basePath}ws`;
console.log('WebSocket connecting to:', wsUrl, 'basePath:', this.basePath);
try {
this.ws = new WebSocket(wsUrl);
this.ws.onopen = () => {
console.log('WebSocket connected');
this.isConnected = true;
this.reconnectAttempts = 0;
this.emit('connected');
};
this.ws.onmessage = (event) => {
try {
// Validate message size (prevent memory issues)
const maxMessageSize = 10 * 1024 * 1024; // 10MB
if (event.data && event.data.length > maxMessageSize) {
console.error('WebSocket message too large:', event.data.length, 'bytes');
this.ws.close();
return;
}
const message = JSON.parse(event.data);
if (!message || typeof message !== 'object') {
console.error('Invalid WebSocket message format');
return;
}
this.handleMessage(message);
} catch (e) {
console.error('Failed to parse WebSocket message:', e);
}
};
this.ws.onerror = (error) => {
console.error('WebSocket error:', error);
this.emit('error', error);
};
this.ws.onclose = () => {
console.log('WebSocket disconnected');
this.isConnected = false;
this.emit('disconnected');
if (this.shouldReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
this.reconnectAttempts++;
const delay = this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1);
console.log(`Reconnecting in ${delay}ms (attempt ${this.reconnectAttempts}/${this.maxReconnectAttempts})`);
setTimeout(() => this.connect(), delay);
}
};
} catch (e) {
console.error('Failed to create WebSocket connection:', e);
this.emit('error', e);
}
}
handleMessage(message) {
const { type, payload, time } = message;
// Emit to specific type listeners
this.emit(type, payload, time);
// Emit to all listeners
this.emit('message', { type, payload, time });
}
on(event, callback) {
if (!this.listeners.has(event)) {
this.listeners.set(event, []);
}
const callbacks = this.listeners.get(event);
if (!callbacks.includes(callback)) {
callbacks.push(callback);
}
}
off(event, callback) {
if (!this.listeners.has(event)) {
return;
}
const callbacks = this.listeners.get(event);
const index = callbacks.indexOf(callback);
if (index > -1) {
callbacks.splice(index, 1);
}
}
emit(event, ...args) {
if (this.listeners.has(event)) {
this.listeners.get(event).forEach(callback => {
try {
callback(...args);
} catch (e) {
console.error('Error in WebSocket event handler:', e);
}
});
}
}
disconnect() {
this.shouldReconnect = false;
if (this.ws) {
this.ws.close();
this.ws = null;
}
}
send(data) {
if (this.ws && this.ws.readyState === WebSocket.OPEN) {
this.ws.send(JSON.stringify(data));
} else {
console.warn('WebSocket is not connected');
}
}
}
// Create global WebSocket client instance
// Safely get basePath from global scope (defined in page.html)
window.wsClient = new WebSocketClient(typeof basePath !== 'undefined' ? basePath : '');
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