Content translation/cxserver/Setup

Note: Using Docker will make this setup easier. Please refer Content Translation Docker configuration documentation if you like to use it

Installation

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Get the code

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Content Translation Server

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If you want to do an anonymous checkout:

git clone https://gerrit.wikimedia.org/r/mediawiki/services/cxserver

Or if you plan to hack CXServer, then please follow the Gerrit 'getting started' docs and use an authenticated checkout url instead, such as:

git clone ssh://<user>@gerrit.wikimedia.org:29418/mediawiki/services/cxserver

Nodejs

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Install nodejs 8 or higher. When you are using Ubuntu and depending on OS version you may not end up with the most recent version of nodejs please read this [1] first before you proceed:

sudo apt-get install nodejs npm
nodejs --version # should now print 8 or higher

For other systems, see:

JS dependencies

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Install the JS dependencies. Run this command in the cxserver directory:

npm install

Dictd Server

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Installation

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sudo apt-get install dictd

To install language pair,

sudo apt-get install dict-freedict-xxx-yyy

Where xxx and yyy are two different languages.

On CentOS 7 instead do:

wget ftp://ftp.pbone.net/mirror/ftp5.gwdg.de/pub/opensuse/repositories/home:/Kenzy:/packages/CentOS_7/x86_64/dictd-server-1.12.0-6.4.x86_64.rpm
rpm -Uvh dictd-server-1.12.0-6.4.x86_64.rpm

RESTBase Server

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Installation

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See RESTBase/Installation.

Server Configuration

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An example configuration file is given as config.dev.yaml and config.prod.yaml.

RESTBase configuration section

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...
    restbase_req:
        method: '{{request.method}}'
        uri: http://localhost:7231/YOUR_WIKI_WEBSITE/v1/{+path}
        query: '{{ default(request.query, {}) }}'
        headers: '{{request.headers}}'
        body: '{{request.body}}'
...

Apertium configuration section

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...
    apertium:
          api: http://localhost:2737
...

The server expected on localhost:2737 is then Apertium-apy . (See http://wiki.apertium.org/wiki/Apy for instructions; you'll have to install Apertium and at least one language pair too). Adjust configuration according to your requirement and restart the server.

Run the server

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Using node

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$ nodejs server.js

On CentOS 7:

$ node server.js

Using npm

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$ npm start

As a cxserver command

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Following step is to be performed only once. You might have to use 'sudo'.

$ npm link .

Subsequently, just use following to start the server.

$ cxserver

Then browse to http://localhost:8080/v1 You'll see the server playground page.

Running it in secure mode (https)

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In the configuration file, provide the SSL certificate details and set value of 'secure' as true

Debugging

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To run the ContentTranslation server:

$ npm run-script debug

It will open Chrome developer tools with the ContentTranslation source code. You can debug the code just like a web application. You can also edit the code and save from the debugger.

Starting cxserver automatically

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There are many ways to start services automatically, consult your server's operating system documentation.

upstart

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On Ubuntu and other operating systems using Upstart, one approach is

sudo ln -s /lib/init/upstart-job /etc/init.d/cxserver
sudo vi /etc/init/cxserver.conf

And, use following upstart script template:

# Upstart job configuration for cxserver

description "cxserver service"

start on (local-filesystems and net-device-up IFACE!=lo)
stop on runlevel [!2345]

setuid "www-data"
setgid "www-data"

env NODE_PATH="/path/to/cxserver/node_modules"

chdir "/path/to/cxserver"
exec npm start

respawn

To start cxserver,

sudo service cxserver start

To stop cxserver,

sudo service cxserver stop

Debugging

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Upstart can be debug using log messages at /var/log/syslog.

systemd

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On recent versions of Debian, Fedora and other operating systems using systemd, use a cxserver.service unit file similar to the following template (modify the file paths as appropriate) and place file at /lib/systemd/system/ directory.

[Unit]
Description=MediaWiki Content Translation service
Documentation=https://www.mediawiki.org/wiki/ContentTranslation
Wants=local-fs.target network.target
After=local-fs.target network.target

[Install]
WantedBy=multi-user.target

[Service]
Type=simple
User=www-data
Group=www-data
WorkingDirectory=/path/to/cxserver/node_modules
ExecStart=/usr/bin/node /path/to/cxserver/server.js
KillMode=process
Restart=on-success
PrivateTmp=true
StandardOutput=syslog

To start cxserver,

sudo service cxserver start

To stop cxserver,

sudo service cxserver stop

If you change in service script, you need to reload script by,

sudo systemctl --system daemon-reload

Debugging

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Systemd scripts logs messages at /var/log/syslog. It can be customized using StandardOutput= in cxserver.service script.

Backend Services

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Varnish

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Installation

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sudo apt-get install varnish

Configuration

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1. Configure varnish http accelerator port:

edit /etc/default/varnish

Example configuration to run varnish on port 8000

DAEMON_OPTS="-a :8000 \
             -T localhost:6082 \
             -f /etc/varnish/default.vcl \
             -S /etc/varnish/secret \
             -s malloc,256m"

2. Configure the varnish default backend:

edit /etc/varnish/default.vcl

backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

3. Restart the varnish:

sudo service varnish restart

Make sure you are running cxserver nodejs server on port 8080 - the backend configuration of varnish

cxserver --port=8080

127.0.0.1:8000 will be your server URL with varnish 127.0.0.1:8080 will be your server URL without varnish

4. Configure cxclient's wgContentTranslationServerURL to 127.0.0.1:8000

Extensions dependencies

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Content translation extension requires following extensions as dependencies.

  1. BetaFeatures
  2. Cite
  3. UniversalLanguageSelector
  4. VisualEditor
  5. GlobalPreferences

Also see

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References

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