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Here's a load test for CrocoChat - a WebSocket chat API available on https://test-api.k6.io/.

Multiple VUs join a chat room and discuss various things for up to 1 minute, after which they disconnect.

Each VU receives messages sent by all chat participants.

crocochat.js
1import { randomString, randomIntBetween } from 'https://jslib.k6.io/k6-utils/1.1.0/index.js';
2import ws from 'k6/ws';
3import { check, sleep } from 'k6';
4
5const sessionDuration = randomIntBetween(10000, 60000); // user session between 10s and 1m
6const chatRoomName = 'publicRoom'; // choose your chat room name
7
8export const options = {
9 vus: 10,
10 iterations: 10,
11};
12
13export default function () {
14 const url = `wss://test-api.k6.io/ws/crocochat/${chatRoomName}/`;
15 const params = { tags: { my_tag: 'my ws session' } };
16
17 const res = ws.connect(url, params, function (socket) {
18 socket.on('open', function open() {
19 console.log(`VU ${__VU}: connected`);
20
21 socket.send(JSON.stringify({ event: 'SET_NAME', new_name: `Croc ${__VU}` }));
22
23 socket.setInterval(function timeout() {
24 socket.send(JSON.stringify({ event: 'SAY', message: `I'm saying ${randomString(5)}` }));
25 }, randomIntBetween(2000, 8000)); // say something every 2-8seconds
26 });
27
28 socket.on('ping', function () {
29 console.log('PING!');
30 });
31
32 socket.on('pong', function () {
33 console.log('PONG!');
34 });
35
36 socket.on('close', function () {
37 console.log(`VU ${__VU}: disconnected`);
38 });
39
40 socket.on('message', function (message) {
41 const msg = JSON.parse(message);
42 if (msg.event === 'CHAT_MSG') {
43 console.log(`VU ${__VU} received: ${msg.user} says: ${msg.message}`);
44 } else if (msg.event === 'ERROR') {
45 console.error(`VU ${__VU} received:: ${msg.message}`);
46 } else {
47 console.log(`VU ${__VU} received unhandled message: ${msg.message}`);
48 }
49 });
50
51 socket.setTimeout(function () {
52 console.log(`VU ${__VU}: ${sessionDuration}ms passed, leaving the chat`);
53 socket.send(JSON.stringify({ event: 'LEAVE' }));
54 }, sessionDuration);
55
56 socket.setTimeout(function () {
57 console.log(`Closing the socket forcefully 3s after graceful LEAVE`);
58 socket.close();
59 }, sessionDuration + 3000);
60 });
61
62 check(res, { 'Connected successfully': (r) => r && r.status === 101 });
63}