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import { WebSocketServer, WebSocket } from 'ws';
import { IncomingMessage } from 'http';
import { parse } from 'url';
interface ExtendedWebSocket extends WebSocket {
tenantId?: string;
sessionToken?: string;
isAlive?: boolean;
}
export function setupWebSocket(wss: WebSocketServer) {
const clients = new Map<string, ExtendedWebSocket>();
wss.on('connection', (ws: ExtendedWebSocket, req: IncomingMessage) => {
// Parse query parameters
const query = parse(req.url || '', true).query;
const tenantId = query.tenantId as string;
const sessionToken = query.sessionToken as string;
if (!tenantId || !sessionToken) {
ws.close(1008, 'Missing tenantId or sessionToken');
return;
}
// Set up connection
ws.tenantId = tenantId;
ws.sessionToken = sessionToken;
ws.isAlive = true;
// Store client connection
const clientKey = `${tenantId}:${sessionToken}`;
clients.set(clientKey, ws);
console.log(`WebSocket client connected: ${clientKey}`);
// Handle ping/pong for connection health
ws.on('pong', () => {
ws.isAlive = true;
});
ws.on('message', (data: Buffer) => {
try {
const message = JSON.parse(data.toString());
handleMessage(ws, message);
} catch (error) {
console.error('Invalid WebSocket message:', error);
ws.send(JSON.stringify({ error: 'Invalid message format' }));
}
});
ws.on('close', () => {
console.log(`WebSocket client disconnected: ${clientKey}`);
clients.delete(clientKey);
});
ws.on('error', (error) => {
console.error('WebSocket error:', error);
clients.delete(clientKey);
});
// Send welcome message
ws.send(JSON.stringify({
type: 'connection',
message: 'Connected to chat server',
timestamp: new Date().toISOString()
}));
});
// Health check - ping clients every 30 seconds
const interval = setInterval(() => {
wss.clients.forEach((ws: ExtendedWebSocket) => {
if (ws.isAlive === false) {
return ws.terminate();
}
ws.isAlive = false;
ws.ping();
});
}, 30000);
wss.on('close', () => {
clearInterval(interval);
});
function handleMessage(ws: ExtendedWebSocket, message: any) {
switch (message.type) {
case 'ping':
ws.send(JSON.stringify({ type: 'pong', timestamp: new Date().toISOString() }));
break;
case 'typing':
// Broadcast typing indicator to other participants (if multi-user chat)
broadcastToSession(ws.tenantId!, ws.sessionToken!, {
type: 'typing',
sender: 'user',
timestamp: new Date().toISOString()
}, ws);
break;
case 'stop_typing':
broadcastToSession(ws.tenantId!, ws.sessionToken!, {
type: 'stop_typing',
sender: 'user',
timestamp: new Date().toISOString()
}, ws);
break;
default:
ws.send(JSON.stringify({ error: 'Unknown message type' }));
}
}
function broadcastToSession(tenantId: string, sessionToken: string, message: any, sender?: WebSocket) {
const clientKey = `${tenantId}:${sessionToken}`;
const client = clients.get(clientKey);
if (client && client !== sender && client.readyState === WebSocket.OPEN) {
client.send(JSON.stringify(message));
}
}
// Utility function to send message to specific session
function sendToSession(tenantId: string, sessionToken: string, message: any) {
const clientKey = `${tenantId}:${sessionToken}`;
const client = clients.get(clientKey);
if (client && client.readyState === WebSocket.OPEN) {
client.send(JSON.stringify(message));
return true;
}
return false;
}
return {
broadcastToSession,
sendToSession,
getConnectedClients: () => clients.size
};
} |