Architecture Intermediate

WebSocket — real-time komunikace¶

WebSocketReal-timeSocket.io 3 min read

Implementace WebSocket serveru pro chat, notifikace a live dashboardy. Škálování s Redis.

Kdy WebSocket?¶

Obousměrný, persistentní kanál. Server can pushovat data klientovi. Use cases: chat, notifikace, real-time dashboardy.

Socket.io example¶

// Server
const io = new Server(3000, { cors: { origin: '*' } });
io.on('connection', (socket) => {
    socket.on('join-room', (room) => socket.join(room));
    socket.on('message', (data) => {
        io.to(data.room).emit('message', {
            from: socket.id, text: data.text, ts: Date.now()
        });
    });
});
// Škálování: Redis adapter
const { createAdapter } = require('@socket.io/redis-adapter');
io.adapter(createAdapter(pubClient, subClient));

Summary¶

Socket.io simplifies implementaci. Pro scaling add Redis adapter a sticky sessions.

Need Help with Implementation?¶

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