WebSockets

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}