I am using the k6 Load Testing Tool for the first time.
I send a GET request and html is sent in the response. I then need to extract some values from this html.
What is the best way of doing this in HTML? I have seen in the documentation that there are the following 3 mands that could possibly be of help:
Response.body
Selection.find(selector)
Response.json([selector])
The HTML is shown below. I want to extract the values of csrf and transId
<html lang="en">
<head>
<link rel="icon" href="data:;base64,iVBORw0KGgo=">
<script data-container="true" nonce="ekqlmSlKlpMlCSDxgP6erg==">
var SETTINGS = {
"csrf": "I NEED THIS VALUE",
"transId": "I ALSO NEED THIS VALUE",
};
</script>
</head>
<body>
</body>
</html>
I think I could do it using Response.body and then searching for a substring. Is this the best way of doing it?
I am using the k6 Load Testing Tool for the first time.
I send a GET request and html is sent in the response. I then need to extract some values from this html.
What is the best way of doing this in HTML? I have seen in the documentation that there are the following 3 mands that could possibly be of help:
Response.body
Selection.find(selector)
Response.json([selector])
The HTML is shown below. I want to extract the values of csrf and transId
<html lang="en">
<head>
<link rel="icon" href="data:;base64,iVBORw0KGgo=">
<script data-container="true" nonce="ekqlmSlKlpMlCSDxgP6erg==">
var SETTINGS = {
"csrf": "I NEED THIS VALUE",
"transId": "I ALSO NEED THIS VALUE",
};
</script>
</head>
<body>
</body>
</html>
I think I could do it using Response.body and then searching for a substring. Is this the best way of doing it?
Share edited Dec 9, 2021 at 17:51 greybeard 2,5559 gold badges38 silver badges70 bronze badges asked Jul 26, 2020 at 10:28 MattMatt 1,0432 gold badges21 silver badges42 bronze badges2 Answers
Reset to default 5Firstly, to get the contents of the script tag, you can do
const doc = parseHTML(res.body);
const script = doc.find('head script');
const scriptContent = script.text();
Now to extract needed values from
var SETTINGS = {
"csrf": "I NEED THIS VALUE",
"transId": "I ALSO NEED THIS VALUE",
};
you will have to do some string manipulation that is not remended for a load test script. But you could
a.substr(28, 15)
to get csrf value and
a.substr(57, 22)
to get transId value.
Because in this case you have javascript you could evaluate it and get the values as
import html from "k6/html";
export default function () {
var res = `<html lang="en">
<head>
<link rel="icon" href="data:;base64,iVBORw0KGgo=">
<script data-container="true" nonce="ekqlmSlKlpMlCSDxgP6erg==">
var SETTINGS = {
"csrf": "I NEED THIS VALUE",
"transId": "I ALSO NEED THIS VALUE",
};
</script>
</head>
<body>
</body>
</html>
`
var b = html.parseHTML(res).find("script").text();
console.log(b);
var settings = eval(b + ";SETTINGS;");
console.log(settings.csrf);
}
This way you don't need to know the exact places of the values and you can get more values out of it ... easily ;).
As the other answered mentioned, this is probably not a good idea inside a load testing script - especially the load testing part - if this is in some setup code it's probably fine.
Note: the ;SETTINGS; is because eval returns the last value so we need to put SETTINGS in the end ;)
Alternatively, you could write a helper function to do what Aalok did by hand:
export default function () {
var res = `<html lang="en">
<head>
<link rel="icon" href="data:;base64,iVBORw0KGgo=">
<script data-container="true" nonce="ekqlmSlKlpMlCSDxgP6erg==">
var SETTINGS = {
"csrf": "I NEED THIS VALUE",
"transId": "I ALSO NEED THIS VALUE",
};
</script>
</head>
<body>
</body>
</html>
`
console.log(getLabel(res, "csrf"));
console.log(getLabel(res, "transId"));
}
function getLabel(content, label) {
var start = content.indexOf('"'+label+'":') + label.length + 3;
var nextComma = content.indexOf(',', start);
var nextCurly = content.indexOf('}', start);
var end = Math.min(nextComma,nextCurly);
return content.substring(start,end)
}
You may need to trim some spaces or/and "
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