Key-Value-DB-with-state-based-Authentication

Simplified Redis like key-value DB using “socketserver” framework

Language: Python

Framework: socketserver

Motivation:

Developed a part of 4th year assigment as a part of key-value pair based assignment.
Work involved developing a architecture has a simple yet efficient login implementation.
    
Objective was to develop an application that efficiently use OOP paradime.

Problem Statement:

Implement a TCP-based key-value store. The server implements the key-value store and clients make use of it. 
The server must accept clients’ connections and serve their requests for ‘get’ and ‘put’ key value pairs.
    
All key-value pairs should be stored by the server only in memory. Keys and values are strings.
The client accepts a variable no of command line arguments where the first argument is the server hostname
followed by port no. It should be followed by any sequence of “get <key>” and/or “put <key> <value>”.


The server should be running on a TCP port. The server should support multiple clients and maintain their key-value stores separately.
Implement authorization so that only few clients having the role “manager” can access other’s key-value stores. 
A user is assigned the “guest” role by default. The server can upgrade a “guest” user to a “manager” user. 

Execution:

# First execute the server. (server runs on port on port 9999)
python auth_server.py

# on a different terminal execute
python client.py

#NOTE: minimum python 3.9 required (use of "walrus operator") 

References:

https://docs.python.org/3/howto/sockets.html#socket-howto
https://docs.python.org/3/library/socketserver.html#socketserver-tcpserver-example