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export type WebSocketMessage = {
type: string;
payload: Record<string, unknown>;
timestamp?: number;
};
export type MessageHandler = (message: WebSocketMessage) => void;
export type ConnectionHandler = (connected: boolean) => void;
export class WebSocketService {
private ws: WebSocket | null = null;
private messageHandlers = new Set<MessageHandler>();
private connectionHandlers = new Set<ConnectionHandler>();
private reconnectTimer: ReturnType<typeof setTimeout> | null = null;
private url: string;
constructor() {
const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
this.url = `${protocol}//${window.location.host}/ws`;
}
connect(): void {
if (this.ws?.readyState === WebSocket.OPEN) return;
this.ws = new WebSocket(this.url);
this.ws.onopen = () => {
this.notifyConnection(true);
if (this.reconnectTimer) {
clearTimeout(this.reconnectTimer);
this.reconnectTimer = null;
}
};
this.ws.onmessage = (event) => {
try {
const message = JSON.parse(event.data) as WebSocketMessage;
this.notifyMessage(message);
} catch (error) {
console.error("Error parsing WebSocket message:", error);
}
};
this.ws.onerror = (error) => {
console.error("WebSocket error:", error);
};
this.ws.onclose = () => {
this.notifyConnection(false);
this.scheduleReconnect();
};
}
disconnect(): void {
if (this.reconnectTimer) {
clearTimeout(this.reconnectTimer);
this.reconnectTimer = null;
}
if (this.ws) {
this.ws.close();
this.ws = null;
}
}
send(message: WebSocketMessage): void {
if (this.ws?.readyState !== WebSocket.OPEN) {
throw new Error("WebSocket not connected");
}
this.ws.send(JSON.stringify(message));
}
isConnected(): boolean {
return this.ws?.readyState === WebSocket.OPEN;
}
onMessage(handler: MessageHandler): () => void {
this.messageHandlers.add(handler);
return () => this.messageHandlers.delete(handler);
}
onConnection(handler: ConnectionHandler): () => void {
this.connectionHandlers.add(handler);
return () => this.connectionHandlers.delete(handler);
}
private notifyMessage(message: WebSocketMessage): void {
this.messageHandlers.forEach((handler) => handler(message));
}
private notifyConnection(connected: boolean): void {
this.connectionHandlers.forEach((handler) => handler(connected));
}
private scheduleReconnect(): void {
if (!this.reconnectTimer) {
this.reconnectTimer = setTimeout(() => {
this.reconnectTimer = null;
this.connect();
}, 3000);
}
}
}
export const websocketService = new WebSocketService();
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