Extension:External Data/Presets

A preset is a preconfigured data source found in the includes/presets directory. Most of presets describe a connection to a Docker container, Dockerfile's and docker-compose.yml snippets for which are also provided. Presets can be used to test the extension for regressions, retrieving some reference data or (with the tag emulation mode) embedding media content, especially various charts, replacing many specialised MediaWiki extensions.

Containers

Most of the presets describe connections to dockerised applications. Some images for containers are pulled from Docker Hub, but four images have to be built from enclosed Docker files (not yet published at https://hub.docker.com):

Path to Dockerfile	Description
includes/presets/postgresql/Dockerfile	PostgreSQL server with DVD rental test database preinstalled
includes/presets/mssqlserver/Dockerfile	Microsoft SQL Server with Northwind test database preinstalled
includes/presets/mongodb/Dockerfile	MongoDB with USA postal zip codes test database preinstalled
includes/presets/cgi/Dockerfile	A universal Dockerfile for wrapping various (with different build arguments) reference or media applications (Alpine APK packages, downloadable binaries, compiled C/C++ and Go, node.js, Python PIP packages) with a CGI script, converting them into web services

Parameters necessary to build and start containers are given in the included docker-compose.yml file: includes/presets/docker-compose.yml.

The containers can either be parts of the same Dicker compose/Docker swarm setup as the MediaWiki application and its frontend (if any), which is the preferred way, or can interact with a standalone MediaWiki installation.

Testing presets

Testing presets are created to manually test this extension for regressions. A single testing preset can be activated with $wgExternalDataSources['preset name'] = \ExternalData\Presets\Test::source( 'preset name' ); in LocalSettings.php. To activate them all, add wgExternalDataSources['load test presets'] = true;.

Name	Software	Type	Dockerfile	External resource
ldap	LDAP	LDAP		ldap.forumsys.com
local	mySQL	Database with prepared statements		Wiki's database (externallinks and iwlinks joined with interwiki tables)
rfam	mySQL	Database		mysql-rfam-public.ebi.ac.uk
rfam_prepared	mySQL	Database with prepared statements		mysql-rfam-public.ebi.ac.uk
rfam_prepared_multiple	mySQL	Database with prepared statements (several per connection)		mysql-rfam-public.ebi.ac.uk
secret	mySQL	Database with prepared statements (hidden data source)		mysql-rfam-public.ebi.ac.uk
postgresql	PostgreSQL	PostgreSQL	includes/presets/postgresql/Dockerfile	with DVD rental example database
postgresql_prepared	PostgreSQL	PostgreSQL (prepared statements)	includes/presets/postgresql/Dockerfile	with DVD rental example database
mssqlserver	Microsoft SQL Server	MS SQL Server	includes/presets/mssqlserver/Dockerfile	with Northwind example database
mssqlserver_prepared	Microsoft SQL Server	MS SQL Server (with prepared statements)	includes/presets/mssqlserver/Dockerfile	with Northwind example database
mongodb	MongoDB	MongoDB	includes/presets/mongodb/Dockerfile	with USA postal zip codes database
file	JSON file	File		extension.json of this extension
directory	directory listing	Directory		includes directory of this extension

Reference presets

Reference presets give the wiki access to certain software that can be used for reference. A single reference preset can be activated with $wgExternalDataSources['preset name'] = \ExternalData\Presets\Reference::source( 'preset name' ); in LocalSettings.php. To activate them all, add wgExternalDataSources['load reference presets'] = true;. Most of these datasources are technically web accessors to a CGI container (includes/presets/cgi/Dockerfile).

Name	Software
man	man
whatis	man
apropos	man
apk info	Alpine apk info
apk dot	Alpine apk dot (best with Graphviz)
whois	whois
composer show	composer show
youtube-dl	youtube-dl serving video metadata as JSON
mmdbinspect	mmdbinspect
tzdata	tzdata
flags	A service that provides SVG country flags for their codes invoked with ‎<flag iso2="il" width="80" height="40" />
pdf2txt	pdfminder

Media presets

Media presets give the wiki access to certain multimedia software, mostly various charts. A single media preset can be activated with $wgExternalDataSources['preset name'] = \ExternalData\Presets\Media::source( 'preset name' ); in LocalSettings.php. To activate them all, add wgExternalDataSources['load media presets'] = true;.

Most of these datasources are technically web accessors to a CGI container (includes/presets/cgi/Dockerfile).

Most of the data sources serve SVG that is embedded into wikitext. For that reason, the data sources work in tag emulation mode. Using the {{#tag:...}} syntax, the source code for the multimedia content can be generated dynamically.

Some of the extensions, in addition to the server part, have a client part in JavaScript that makes the multimedia interactive in user's browser. That means that the directory containing the JavaScript has to be mounted into web frontend container (or otherwise made servable by it).

Name	Software	Tag	Scripts URL	Comment
mathjax	MathJax	‎<mathjax display="inline" nomenu>e = mc ^ 2‎</mathjax>	/js/mathjax	Uses the same container as MathJax extension, but lacks many features of it, therefore, not ‎<math>...‎</math>
lilypond	Lilypond	‎<score size>(musical score)‎</score>		Replaces most of the features of Score
zint	zint	‎<barcode type="ISBNX" background="00000000" foreground="000000" rotate="0" scale="1.0"> (barcode data)‎</barcode>
graphviz	GraphViz	‎<graphviz layout="dot"> (dot notation)‎</graphviz>		Replaces any GraphViz extension, adding features like wikilinks and images. The uploads directory has to be mounted into the container for the latter feature
mscgen	mscgen	‎<mscgen>(mscgen notation)‎</mscgen>		Shows mscgen diagrams with wikilinks
plantuml	PlantUML	‎<plantuml>(PlantUML notation)‎</plantuml>		Replaces the PlantUML extension; allows wikilinks
ploticus	Ploticus	‎<ploticus scale="1" fontsize="4" title=""> (Ploticus notation)‎</ploticus>		Replaces the Ploticus extension; allows wikilinks
timeline	EasyTimeline	‎<timeline>(EasyTimeline notation)‎</timeline>	/js/ploticus	Replaces the EasyTimeline extension
gnuplot	gnuplot	‎<gnuplot width="600" height="400" size="10" name="gnuplot" heads="butt">(gnuplot notation)‎</gnuplot>	/js/gnuplot	Replaces the Gnuplot extension; allows to scale and move the graph in the browser
vega	Vega	‎<graph width="600" height="600" currency="₽" yaml>(JSON Vega config)‎</graph>	/js/vega	Replaces the Graph extension; allows to use YAML
mermaid	Mermaid	‎<mermaid width="800" height="600" scale="1" theme="default" look="classic" background="white">(MMD notation)‎</mermaid>	/js/mermaid	Replaces the Mermaid extension and Flex Diagrams's Mermaid feature
bpmn	BPMN	‎<bpmn width="400" height="300" scale="1" title="BPMN diagram"> (BPMN XML)‎</bpmn>		Replaces the Flex Diagrams's BPMN feature. Uses bpmn2svg program by Pierre Schwang
echarts	Apache ECharts	‎<echarts width="400" height="300" locale="$wgLanguageCode" theme="macarons" yaml> (JSON EChart config)‎</echarts>	/js/echarts	Replaces the ECharts extension; allows to use YAML