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umami/scripts/loadtest.js

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const loadtest = require('loadtest');
const chalk = require('chalk');
const trunc = num => +num.toFixed(1);
/**
* Example invocations:
*
* npm run loadtest -- --weight=heavy
* npm run loadtest -- --weight=heavy --verbose
* npm run loadtest -- --weight=single --verbose
* npm run loadtest -- --weight=medium
*/
/**
* Command line arguments like --weight=heavy and --verbose use this object
* If you are providing _alternative_ configs, use --weight
* e.g. add --weight=ultra then add commandlineOptions.ultra={}
* --verbose can be combied with any weight.
*/
const commandlineOptions = {
single: {
concurrency: 1,
requestsPerSecond: 1,
maxSeconds: 5,
maxRequests: 1,
},
// Heavy can saturate CPU which leads to requests stalling depending on machine
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// Keep an eye if --verbose logs pause, or if node CPU in top is > 100.
// https://github.com/alexfernandez/loadtest#usage-donts
heavy: {
concurrency: 10,
requestsPerSecond: 200,
maxSeconds: 60,
},
// Throttled requests should not max out CPU,
medium: {
concurrency: 3,
requestsPerSecond: 5,
maxSeconds: 60,
},
verbose: { statusCallback },
};
const options = {
url: 'http://localhost:3000',
method: 'POST',
concurrency: 5,
requestsPerSecond: 5,
maxSeconds: 5,
requestGenerator: (params, options, client, callback) => {
const message = JSON.stringify(mockPageView());
options.headers['Content-Length'] = message.length;
options.headers['Content-Type'] = 'application/json';
options.body = message;
options.path = '/api/collect';
const request = client(options, callback);
request.write(message);
return request;
},
};
function getArgument() {
const weight = process.argv[2] && process.argv[2].replace('--weight=', '');
const verbose = process.argv.includes('--verbose') && 'verbose';
return [weight, verbose];
}
// Patch in all command line arguments over options object
// Must do this prior to calling `loadTest()`
getArgument().map(arg => Object.assign(options, commandlineOptions[arg]));
loadtest.loadTest(options, (error, results) => {
if (error) {
return console.error(chalk.redBright('Got an error: %s', error));
}
console.log(chalk.bold(chalk.yellow('\n--------\n')));
console.log(chalk.yellowBright('Loadtests complete:'), chalk.greenBright('success'), '\n');
prettyLogItem('Total Requests:', results.totalRequests);
prettyLogItem('Total Errors:', results.totalErrors);
prettyLogItem(
'Latency(mean/min/max)',
trunc(results.meanLatencyMs),
'/',
trunc(results.maxLatencyMs),
'/',
trunc(results.minLatencyMs),
);
if (results.totalErrors) {
console.log(chalk.redBright('*'), chalk.red('Total Errors:'), results.totalErrors);
}
if (results.errorCodes && Object.keys(results.errorCodes).length) {
console.log(chalk.redBright('*'), chalk.red('Error Codes:'), results.errorCodes);
}
});
/**
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* Create a new object for each request. Note, we could randomize values here if desired.
*
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* TODO: Need a better way of passing in websiteId, hostname, URL.
*
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* @param {object} payload pageview payload same as sent via tracker
*/
function mockPageView(
payload = {
website: 'fcd4c7e3-ed76-439c-9121-3a0f102df126',
hostname: 'localhost',
screen: '1680x1050',
url: '/LOADTESTING',
},
) {
return {
type: 'pageview',
payload,
};
}
// If you pass in --verbose, this function is called
function statusCallback(error, result, latency) {
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if (error) {
return console.error(chalk.redBright(error));
}
console.log(
chalk.yellowBright(`\n## req #${result.requestIndex + 1} of ${latency.totalRequests}`),
);
prettyLogItem('Request elapsed milliseconds:', trunc(result.requestElapsed));
prettyLogItem(
'Latency(mean/max/min):',
trunc(latency.meanLatencyMs),
'/',
trunc(latency.maxLatencyMs),
'/',
trunc(latency.minLatencyMs),
);
}
function prettyLogItem(label, ...args) {
console.log(chalk.redBright('*'), chalk.green(label), ...args);
}