Introduction

This document describes the OpenNSA software from the standpoint of a Python developer who want to extend or improve the software. 

Components

The major components making  up OpenNSA  are (partly from requirements.txt):

• Python 2.7 plus its standard library
• Twisted (event-driven networking engine)
• pyOpenSSL (SSL in python)
• psycopg2 (Python-PostgreSQL Database Adapter)
• Twistar (non-blocking ORM for Twisted)

  
  

The standard library for Python is huge, but some important choises made are:

• Configuration: ConfigParser (see opennsa/config.py and setyp.py for usage)
• Logging: twisted/ILogObserver (see opennsa/logging.py and setup.py for usage)