This is an extension to Practical-Byzantine-Fault-Tolerance-PBFT implementation by CyHsiung

ChangeLog

• Added a Blockchain implementation
• Replaced MD5 hash with SHA-256
• Minor Bugfix

A simple PBFT protocol over HTTP, using python3 asyncio/aiohttp. This is just a proof of concept implementation.

Run the nodes and client

Execute run.sh in a terminal. Or Execute run_node.sh and run_client.sh in seperate terminals.

Send data to the blockchain network

First, execute run_node.sh to get the blockchain network running.

Next run a single client instance, to receive the response from the blockchain network, through the command :

python client.py -id 0 -nm 0 &

Finally through the following command a nessagege can be sent to the blockchain network :

curl -vLX POST --data '{ "id":"(0, 0)",
   "client_url":"http://localhost:20001/reply",
   "timestamp":"timestamp",
   "data":"data_string"}' http://localhost:30000/request

The id here is a tuple of (client_id, seq_id), client_url is the url for sending a request to the get_reply function(), timestamp is the current time, data is whatever data in string format. http://localhost:30000/request is the default address of the first node in the blockchain network.

Note that a new block is added to the blockchain after ckpt_interval (default = 10) messages are received.

Configuration

pbft.yaml config file defines the default values for the blockchain network.

Environment

Python: 3.5.3
aiohttp: 3.4.4
yaml: 3.12