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MediaWiki extensions manual
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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 1.24+
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 it is available at translatewiki.net

Check usage and version matrix; code metrics


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The EventLogging extension facilitates the collection of metrics on how users interact with MediaWiki's interface. The Wikimedia Foundation captures this data and analyses it in aggregate 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]

The extension can be retrieved directly from Git [?]:

  • Browse code
  • Some extensions have tags for stable releases.
  • Each branch is associated with a past MediaWiki release. There is also a "master" branch containing the latest alpha version (might require an alpha version of MediaWiki).

Extract the snapshot and place it in the extensions/EventLogging/ directory of your MediaWiki installation.

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

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

Installation[edit | edit source]

  • Download and place the file(s) in a directory called EventLogging in your extensions/ folder.
  • Add the following code at the bottom of your 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.
  • Done! Navigate to "Special:Version" on your wiki to verify that the extension is successfully installed.

Documentation[edit | edit source]

See also: Event logging on Wikitech

Operational Support[edit | edit source]


For developers[edit | edit source]

A thorough guide[edit | edit source]

If you want to log events with EventLogging, read Extension:EventLogging/Guide.

Developer setup[edit | edit source]

Specifying a dependency on EL[edit | edit source]

Sanity Checking Your 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.

installing dev server[edit | edit source]


How to run tests[edit | edit source]

There are PHP tests, python tests, and javascript tests.

To run javascript tests, visit Special:JavaScriptTest/qunit on your development wiki. (see: Manual:JavaScript_unit_testing)

To run PHP tests:

After doing ssh vagrant:
> vagrant@mediawiki-vagrant:/vagrant/mediawiki/tests/phpunit$ php phpunit.php --group EventLogging

To run python tests in vagrant you need to install tox. If you use Windows, may also need to clone it to a directory that is not shared between guest and host (to work around an apparent VirtualBox shared folder issue). E.g.:

> vagrant@mediawiki-vagrant:/vagrant/mediawiki/extensions/EventLogging$ git clone . ~/EventLogging
> vagrant@mediawiki-vagrant:/vagrant/mediawiki/extensions/EventLogging$ sudo pip install tox
> vagrant@mediawiki-vagrant:/vagrant/mediawiki/extensions/EventLogging$ cd ~/EventLogging

Then, run tox:

> tox

Note that tox tries to run tests for Python 2.7 and Python 3.2. EventLogging runs with Python 2.7 in production. If you want to install Python3 in vagrant please run:

>sudo apt-get install python3

How to run flake8[edit | edit source]

> vagrant@mediawiki-vagrant:/vagrant/mediawiki/extensions/EventLogging$ tox -e flake8