BFTStorageService is a byzantine fault tolerant API written in Python for clients to store and read data in several Key Value Stores (KVS) while being resilient to byzantine failures.

This API provides 4 operations to the client:

• write (key, value): Writes a value under the key into a quorum of 3f+1 KVS so that the value is present in the majority of KVSs of the quorum. In order to tolerate f Byzantine Failures.

• read (key): Reads the value of the corresponding key from a majority of the quorum, so that the value is present in the majority of KVSs of the quorum. Thus becoming resilient to Byzantine Failures.

• delete (key, value): Deletes a value under the key from a quorum of 3f+1 KVS so that the value is no longer present in the majority of KVSs of the quorum. In order to tolerate f Byzantine Failures.

• list (): Lists the keys present in the majority of the quorum, i.e. the retrievable keys

This service needs to be installed on the client machines and on the server machines.

• Go to server folder.
• Configure config.json with the IP of the server and port the service will use.
• Run command:

  python StorageService.py

• Go to client folder.
• Configure config.json with:

  "servers": amount of servers the client will use.
  "KVS_IPS": array of pairs ("ip" and "port") one for each server the client will use.

• Integrate API into code with:

  from BftStorageService import *