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Release status: stable

Implementation Special page, Database, ContentHandler
Description Framework for logging analytic events
Author(s) Ori.livnehtalk
Latest version 0.8 (2014-03-26)
MediaWiki 1.21+
PHP 5.3+
Database changes no
License GNU General Public License 2.0 or later
  • $wgEventLoggingBaseUri
  • $wgEventLoggingFile
  • $wgEventLoggingSchemaIndexUri
  • $wgEventLoggingDBname
Hooks used


Translate the EventLogging extension if possible

Check usage and version matrix; code metrics
Bugs: list open list all report

The EventLogging extension facilitates the collection of metrics on how users interact with MediaWiki's interface. The Wikimedia Foundation captures and analyzes this data to better understand how readers and editors interact with our site, to identify usability or performance problems, and to provide feedback for features engineers, with the overarching goal of driving improvements to user experience.

Features[edit | edit source]

  • EventLogging supports client-side logging from JavaScript and server-side logging from PHP.
  • The events are JSON objects defined by JSON schemas that can be edited on a MediaWiki server in a Schema: namespace; the latter feature is generally useful for storing other structured data in wiki pages.
  • The extension includes much back-end code for transporting, parsing and loading these events into SQL tables (automatically generated from the same schemas) and MongoDB collections. The details of these components are specific to Wikimedia Foundation's configuration.

Download[edit | edit source]

You can download the extension directly from the MediaWiki source code repository (browse code). You can get:

One of the extensions tags

Not all extensions have tags. Some extensions have tags for each release, in which case those tags have the same stability as the release. To download a tag

  • Go to the tags list
  • Click the name of the tag you want to download
  • Click "snapshot"
The latest version of one of the extensions branches

Each extension has a master branch containing the latest code (might be unstable). Extensions can have further branches as well.

  • Go to the branches list
  • Click the branch name
  • Click "snapshot"
A snapshot made during the release of a MediaWiki version.

This might be unstable and is not guaranteed to work with the associated MediaWiki version.

After you've got the code, save it into the extensions/EventLogging directory of your wiki.

If you are familiar with git and have shell access to your server, you can obtain the extension, with all its tags and branches, as follows:

cd extensions
git clone https://gerrit.wikimedia.org/r/p/mediawiki/extensions/EventLogging.git

Configure[edit | edit source]

Add these configurations to LocalSettings.php:

require_once( "$IP/extensions/EventLogging/EventLogging.php" );
$wgEventLoggingBaseUri = 'http://localhost:8080/event.gif';
$wgEventLoggingFile = '/var/log/mediawiki/events.log';

If you would like to express a conditional dependency on EventLogging in your extension, see this sample code snippet.

Documentation[edit | edit source]

See also: Event logging on Wikitech

For developers[edit | edit source]

Developer setup[edit | edit source]

Your local instance must be running some cache server, such as memcached.

$wgMainCacheType    = CACHE_MEMCACHED;
$wgMemCachedServers = array( '' );  // this matches Debian /etc/memcached

EventLogging.php describes the EventLogging configuration variables. The extension provides a dummy web server in server/bin that responds to EventLogging's requests to its beacon URL, by default on port 8080. See server/README.rst for Python setup instructions. So you can set

$wgEventLoggingBaseUri = 'http://localhost:8080/event.gif';

and run python EventLogging/server/bin/eventlogging-devserver in a terminal to see events. The MediaWiki-Vagrant server "appliance" uses port 8080, so you may want to use another port like 8081 for event.gif requests.

To verify your setup, browse to any page of your wiki, and in a JavaScript console enter

mw.loader.load( 'ext.eventLogging' );        // load the core module
mw.loader.getState( 'ext.eventLogging' );    // should be "ready"
mw.eventLog.logEvent( null, { "foo": 42 } );

The last line will generate console warnings in debug mode as null is not a known schema, but eventlogging-devserver should dump the event along with its own warnings.

Now read /Guide to learn about creating and using a proper schema for your event.

For server-side events, set $wgEventLoggingFile to a local file writable by the PHP/Web server, and in a terminal run tail -f on that file. This will dump any calls to the PHP efLogServerSideEvent() function.

Tips[edit | edit source]

Don't use a schema name like "MyFakeTest" during development. Since schemas are referenced by MediaWiki revision ID, development versions won't conflict with production, so you should always use a real name and can point to the production wiki holding schemas (wgEventLoggingSchemaIndexUri) during development.