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subscriber.js
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subscriber.js
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/*!
* @author Ori Livneh <ori@wikimedia.org>
*/
'use strict';
// Expose publicly
mw.eventLog = require( './core.js' );
mw.eventLog.Schema = require( './Schema.js' );
/**
* Convert the first letter of a string to uppercase.
*
* @ignore
* @private
* @param {string} word
* @return {string}
*/
function titleCase( word ) {
return word[ 0 ].toUpperCase() + word.slice( 1 );
}
/**
* mw.track handler for EventLogging events.
*
* @ignore
* @private
* @param {string} topic Topic name ('event.*').
* @param {Object} event
*/
function handleTrackedEvent( topic, event ) {
const schema = titleCase( topic.slice( topic.indexOf( '.' ) + 1 ) );
mw.eventLog.logEvent( schema, event );
}
/**
* Subscribe to any 'event'-namespaced topics from mw.track, for example:
*
* `mw.track( 'event.YourSchema', eventData )`
*
* Because subscribers to mw#track receive the full backlog of events
* matching the subscription, event processing can be safely deferred
* until the window's load event has fired. This keeps the impact of
* analytic instrumentation on page load times to a minimum.
*
* @private
* @ignore
*/
function init() {
mw.trackSubscribe( 'event.', handleTrackedEvent );
}
// It's possible for this code to run after the "load" event has already fired.
if ( document.readyState === 'complete' ) {
mw.requestIdleCallback( init );
} else {
// Avoid the logging of duplicate events (T170018).
//
// The load event must only fire once. However, Firefox 51 introduced a
// bug that causes the event to fire again when returning from the
// "Back-Forward cache" (BFCache) under certain circumstances (see
// https://bugzilla.mozilla.org/show_bug.cgi?id=1379762).
$( window ).one( 'load', init );
}

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