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Socket.on(event, callback)

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Set up callback functions for various events on the WebSocket connection. Multiple handlers can be defined for the same event.

ParameterTypeDescription
eventstringThe event name to define a callback for.
callbackfunctionThe function to call when the event happens.
Event nameDescription
openEmitted when the connection is established
messageEmitted when a message is received from the server.
pingEmitted when a ping is received from the server. The client will automatically send back a pong.
pongEmitted when a pong is received from the server.
closeEmitted when the connection is closed by the client Socket.close() or when the server sends the close event with code status 1000 (normal closure).
errorEmitted when an error occurs. Non-normal closure errors will be forwarded.

Example

import ws from 'k6/ws';
import { check } from 'k6';
export default function () {
var url = 'ws://echo.websocket.org';
var params = { tags: { my_tag: 'hello' } };
var response = ws.connect(url, params, function (socket) {
socket.on('open', function open() {
console.log('connected');
socket.send(Date.now());
socket.setInterval(function timeout() {
socket.ping();
console.log('Pinging every 1sec (setInterval test)');
}, 1000);
});
socket.on('ping', function () {
console.log('PING!');
});
socket.on('pong', function () {
console.log('PONG!');
});
socket.on('pong', function () {
// Multiple event handlers on the same event
console.log('OTHER PONG!');
});
socket.on('message', function (message) {
console.log(`Received message: ${message}`);
});
socket.on('close', function () {
console.log('disconnected');
});
socket.on('error', function (e) {
if (e.error() != 'websocket: close sent') {
console.log('An unexpected error occured: ', e.error());
}
});
socket.setTimeout(function () {
console.log('2 seconds passed, closing the socket');
socket.close();
}, 2000);
});
check(response, { 'status is 101': (r) => r && r.status === 101 });
}