Metafacture Playground

This is an approach to provide a web application to play around with Metafactures languages Fix, Flux and Morph inspired by the JSON-LD Playground. This project is inititially created using the leiningen re-frame template.

The production deployment is available at https://metafacture.org/playground/.

The current test deployment is available at https://test.metafacture.org/playground/.

Both deployments provide a web application and an HTTP API

Here you can read about contributing to Metafacture Playground.

Installation

Before starting you need to install Leiningen and a JDK (minimum Java 11).

Install Leiningen

General setup on Unix (see https://leiningen.org/ for other options):

mkdir ~/bin
wget -O ~/bin/lein https://raw.githubusercontent.com/technomancy/leiningen/stable/bin/lein
chmod a+x ~/bin/lein

Install Metafacture Core

This project depends on metafacture-core, which is work in progress. It is possible to display the current version of dependencies in the UI. To display the version, please read this section. This is especially reasonable when installing on a server.

Clone and install metafacture-core:

$ git clone https://github.com/metafacture/metafacture-core.git -b 6.0.0
$ cd metafacture-core

Unix:

$ ./gradlew install

Windows:

$ .\gradlew.bat install

Install Metafacture Fix

This project depends on metafacture-fix, which is work in progress. It is possible to display the current version of dependencies in the UI. To display the version, please read this section. This is especially reasonable when installing on a server.

Clone and install metafacture-fix:

$ git clone https://github.com/metafacture/metafacture-fix.git -b 1.0.0
$ cd metafacture-fix

Unix:

$ ./gradlew install

Windows:

$ .\gradlew.bat install

Clone the metafacture-playground project

$ git clone https://github.com/metafacture/metafacture-playground.git
$ cd metafacture-playground

Move Java policy file

The Metafacture Playground uses the Java Security Manager, so you need to configure proper permissions to run the Metafacture Playground. Please move .java.policy_move_to_home_dir from the project's resources to your user's home directory and remove the suffix '_move_to_home_dir'. Please adapt in the Java policy the lines concerning the file '.project' like described in the policy. If there are problems starting and/or running the Playground, to find the problem it may help to add in the project.clj under the key ':jvm-opts' the entry '"-Djava.security.debug=access"' to see if a permission is missing.

Start in development mode

When using development mode you don't have to restart when changing files. They will be reloaded automatically.

lein watch

Wait a bit, perhaps 20 seconds, keeping an eye out for a sign the compile has finished, then browse to http://localhost:8280.

Start in production mode

Set the java version to 11, like:

export JAVA_CMD=/usr/lib/jvm/java-11-openjdk-amd64/bin/java

To test, compile and build the frontend run:

lein test; lein release

Then start the server with:

lein run

Browse to http://localhost:3000.

Show dependency versions in UI

When installing the Metafacture Playground to a server it's important for users to know which version of Metafacture Core and Metafacture Fix are used to process the workflows in the playground.

To display these versions (or any other dependency of the playground) you have to put a file with the corresponding dependency name into the folder resources/versions, e.g. the dependency of Metafacture Fix is named org.metafacture/metafix in the project.clj, so we need a file named metafix in the folder resources/versions to display the version used in the project.clj in the UI. The content of this file is a URI that should link to the corresponding version or branch commit and should be adapted manually. In the future the content of these files should be adapted automatically when installing Metafacture Fix or Metafacture Core on the server where the playground is running. To display the Metafacture Core dependency we use org.metafacture/metafacture-framework.

Use a release version

If a released version is used, the content of the file contains the link to the release, e.g. https://github.com/metafacture/metafacture-core/releases/tag/metafacture-core-5.3.1.

Use Master/Main or other branch

If the master/main or another branch is used, the content of the file should contain a link to the commit like https://github.com/metafacture/metafacture-fix/commit/b36fcb9 (Please use the short hash link).

Run tests

clj tests

Install karma and headless chrome

npm install -g karma-cli

Point to your Chrome binary, e.g.

export CHROME_BIN='/usr/bin/chromium-browser'

And then run your tests

lein watch

And in another terminal:

karma start

clj tests

Run

lein test

Run workflows on the web server

You also can run workflows on the web server without the web application, passing the GET parameters

data with value

1{a: Faust, b {n: Goethe, v: JW}, c: Weimar}
2{a: Räuber, b {n: Schiller, v: F}, c: Weimar}

,flux with value

inputFile
|open-file
|as-lines
|decode-formeta
|fix(transformationFile)
|encode-xml(rootTag="collection")
|print
;

and transformation with value

move_field(_id, id)
move_field(a, title)
paste(author, b.v, b.n, '~aus', c)
retain(id, title, author)

The parameter values must be URL-encoded so the URL looks like this:

http://localhost:3000/process?flux=inputFile%0A%7Copen-file%0A%7Cas-lines%0A%7Cdecode-formeta%0A%7Cfix%28transformationFile%29%0A%7Cencode-xml%28rootTag%3D%22collection%22%29%0A%7Cprint%0A%3B&transformation=move_field%28_id%2C+id%29%0Amove_field%28a%2C+title%29%0Apaste%28author%2C+b.v%2C+b.n%2C+%27~aus%27%2C+c%29%0Aretain%28id%2C+title%2C+author%29&data=1%7Ba%3A+Faust%2C+b+%7Bn%3A+Goethe%2C+v%3A+JW%7D%2C+c%3A+Weimar%7D%0A2%7Ba%3A+R%C3%A4uber%2C+b+%7Bn%3A+Schiller%2C+v%3A+F%7D%2C+c%3A+Weimar%7D

Use Metafacture Playground API

Beside the web application the Metafacture Playground provides a HTTP API to process workflows. All you need is to provide the workflow information as JSON parameters in your POST request.

curl -X POST https://metafacture.org/playground/process -H 'Content-Type: application/json' -d '{"data":"1{a: Faust, b {n: Goethe, v: JW}, c: Weimar}\n2{a: Räuber, b {n: Schiller, v: F}, c: Weimar}","flux":"inputFile\n|open-file\n|as-lines\n|decode-formeta\n|fix(transformationFile)\n|encode-xml(rootTag=\"collection\")\n|print\n;","transformation":"move_field(_id, id)\nmove_field(a, title)\npaste(author, b.v, b.n, \"~aus\", c)\nretain(id, title,
 author)\n"}'