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import config from '@automattic/calypso-config';
import { throttle } from 'lodash';
import { logServerEvent } from 'calypso/lib/analytics/statsd-utils';
// Compute the number of milliseconds between each call to recordTiming
const THROTTLE_MILLIS = 1000 / config( 'statsd_analytics_response_time_max_logs_per_second' );
const logAnalyticsThrottled = throttle( ( { sectionName, duration, loggedIn, usedSSRHandler } ) => {
const events = [
// Basic per-section response time metric for backwards compatibility.
{
name: 'response_time',
value: duration,
type: 'timing',
isLegacy: true,
},
// More granular response-time metric including SSR and auth status.
{
name: `response_time.${
loggedIn ? 'logged-in' : 'logged-out'
}.ssr_pipeline_${ usedSSRHandler }`,
value: duration,
type: 'timing',
},
];
logServerEvent( sectionName, events );
}, THROTTLE_MILLIS );
/*
* Middleware to log the response time of the node request for a section.
* Only logs if the request context contains a `sectionName` attribute.
*/
export function logSectionResponse( req, res, next ) {
const startRenderTime = Date.now();
res.on( 'close', function () {
if ( ! req.context?.sectionName ) {
return;
}
const { user, sectionName, usedSSRHandler } = req.context;
logAnalyticsThrottled( {
loggedIn: !! user,
usedSSRHandler: !! usedSSRHandler, // Can be undefined.
duration: Date.now() - startRenderTime,
sectionName,
} );
} );
next();
}
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