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The Architecture of Superdesk

Photo by Flickr user Elvin (CC BY-NC 2.0)
Photo by Flickr user Elvin (CC BY-NC 2.0)

Our Superdesk open source software is built following the REST architectural style, the client is an Angular driven application and the backend is being built using Python 3 and the Flask-based Eve framework.

This post will do a deep dive into the backend side of the current architecture, the client side will be tackled by an upcoming post.

Tech stack

  • Elasticsearch - secondary data storage, enhanced search capabilities
  • Python 3 - provides all the goodies to make developers happy
  • Eve - easy way to define the REST-like API
  • Flask - besides being the backbone for Eve, we use it extensively for creating custom commands
  • MongoDB - main data storage
  • Celery - task distribution, workhorse for background data processing
  • Redis - mainly used for passing data to Celery workers and for task synchronization
  • Autobahn - WebSocket communication handling, main notification mechanism
  • Honcho - manage the running applications

Optional dependencies

  • Docker - custom built images for server and client, easy run&deploy scenarios
  • LogStash - centralised logging

The full list of development dependencies can be found here.

Overview

Overview

 

What's visible at a quick glance is that the current backend infrastructure is composed of three running apps:

  • Celery application sharing a lot of the internal infrastructure of the Eve application
  • Flask/Eve web application running on top of [Gunicorn]
  • WebSocket server to handle client notifications

On the storage side of things, we have:

  • Mongo as the main storage engine
  • Elastic as the main search engine
  • Redis for sending data to and from Celery workers
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