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Render service (Offline Content Generator) for MediaWiki.

Ties together the MediaWiki Collection extension with the mw-ocg-bundler and mw-ocg-latexer/mw-ocg-texter/etc backends.

Running a development server

See wiki for instructions on how to configure a local Collection extension to point to this server. But you can run a local instance with

apt-get install redis-server # runs a local redis service on port 6379 
cd <repodir> ; npm install
./mw-ocg-service.js # starts a front end ocg service on port 17080 

You also need to checkout and install mw-ocg-bundler and one or more backends (mw-ocg-latexer, mw-ocg-texter, etc). Although you can specify any path to these in you like, the default configuration expects them to be at the same directory level as mw-ocg-bundler, eg:

$OCG/mw-ocg-service (this package)

If you have installed VisualEditor, no additional configuration will be necessary: OCG will use the VisualEditor configuration to find an appropriate Parsoid service and prefix.

In the absence of VisualEditor, you will still need to install Parsoid, and then configure OCG to use it. You will launch mw-ocg-service as ./mw-ocg-service.js -c localsettings.js and create a localsettings.js file containing:

// for mw-ocg-service 
module.exports = function(config) {
  // change the port here if you are running parsoid on a different port 
  config.backend.bundler.parsoid_api = "http://localhost:8000";
  // the prefix here should match $wgDBname in your LocalSettings.php 
  config.backend.bundler.parsoid_prefix = "localhost";

Parsoid would in turn be configured with its own localsettings.js containing:

// for Parsoid 
exports.setup = function( parsoidConfig ) {
  // first argument here should match $wgDBname in your LocalSettings.php 
  parsoidConfig.setInterwiki( 'localhost', 'http://localhost/path/to/your/mediawiki/api.php' );
  // optional: 
  parsoidConfig.serverPort = 8000;

Installing a production server on Ubuntu

Ensure that you have a redis server installed somewhere.

cd <repodir> ; npm install
ln -s <repodir>/mw-collection-ocg.conf /etc/init
initctl reload-configuration
service mw-collection-ocg start

Create /etc/mw-collection-ocg.js to configure the render service. See the default configuration for more details.

Binary node modules

The following node binary module is required:

  • sqlite3 (for bundler and latex_renderer)

In addition, better performance is obtained if the following binary module is installed:

  • hiredis (for this service)

Be aware of these when deploying to a new node version or machine architecture. You may need to npm rebuild <package name>.


This software uses the bunyan logging framework. By default the framework only logs to the system console. To add additional log transports and make it useful, in the config file add lines like:

var bsyslog = require('bunyan-syslog');
config.logging = {
  streams: [{
    stream: process.stdout
  }, {
    level: 'debug',
    type: 'raw',
    stream: bsyslog.createBunyanStream({
      type: 'sys',
      facility: bsyslog.local0,
      name: 'mw-ocg-service'
  }, {
    type: 'raw',
    stream: require('gelf-stream').forBunyan( '', PORT)
  serializers: ... /* optional */


The health check command=health will return the number of objects currently in the job queue. If the job queue is too long, the operator can either wait for the queue to clear, or log into the redis server with the rediscli and run DEL with the keyname given by in the returned health hash, equivilant to the value of config.redis.job_queue_name


(c) 2014 by Brad Jorsch, C. Scott Ananian, Matthew Walker, Max Seminik

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.