File Editor App

View on GitHub


Fig. 8 Example of the File Editor App viewing the contents of a file.

This Open OnDemand application provides a web-based file editor that allows the user to remotely edit files on the HPC center’s local file system. This application is built with the Ruby on Rails web application framework.

The File Editor App uses the Ace Editor (an embeddable code editor written in JavaScript) as the client-side editor. This client provides syntax highlighting, automatic indenting, key bindings, code folding, and many more features.


This app is deployed on the OnDemand Server under the following path on the local file system:


and can be accessed with the following browser request:

GET /pun/sys/file-editor/edit/(path)

Launches the File Editor App with the file corresponding to the path in the editor.

Example request:

GET /pun/sys/file-editor/edit/home/user/my_file HTTP/1.1

Launches the File Editor App with the contents of the file /home/user/my_file in the editor.

How it Works

Requirements needed for the File Editor App to work on your local HPC network:

  • OnDemand Server
  • Shared File System

Fig. 9 Diagram detailing how the File Editor App interacts with the HPC infrastructure.

Fig. 9 details how the File Editor App works on a local HPC system. The user’s PUN running on the OnDemand Server launches the Ruby on Rails File Editor app through Passenger as the user. The File Editor app then interacts with the local and shared file systems for reading and writing the file contents.