Simple PBFT implementation using Python

A rather simplistic implementation of the pBFT protocol using Python 3.8. It is helpful to analyze and possibly optimize the algorithm, as well as use it for proof-of-concepts.

The repo is still a work in progress with tons of room for optimizations, but anyone wanting to help me improving it is welcome to contribute to it.

Unit tests:

python3 -m unittest test_util.py test_node.py test_network.py

Prerequisites

Was tested with Python 3.8.10 Install aiologger: pip install aiologger

Known bugs

• ResourceWarning: unclosed event loop

TODO:

• Move collection classes from util.py to db.py
• Trigger view change after every X requests; currently the primary is only changed when the faulty timer kicks in
• use tinyrpc or gRPC to make the application distributed.
• The Signature is just a shell for now. Decide when to use signature versus MAC for improved performance.
• Replace the collection classes with in-memory datatase, for better performance.
• 100% unit test coverage