Computer Networking coursework project

This repository contains the coursework project for a P2P Pandemic Tracking Application. It's a tool designed to monitor and analyze through simple distributed queries the progression of pandemics in a decentralized manner.

Developed in C language, uses I/O multiplexing to handle the communication with multiple peers and handle the user input (for inserting data and performing queries). Also uses the standard C library wordexp to for shell-like expansion of user input.

Features

• Hospital operators can input pandemic-related data (eg. number of cases) into their local peer archives
• Each peer independently manages its local data for data decentralization
• Supports various types of data queries requiring data aggregation from peers
• Peers exchange data through query-flooding to respond to queries
• Implements a basic caching mechanism to optimize query response times for frequently requested results

Structure

├─ Modules*:
│   ├─ comm             # msg struct + functions to send/receive
│   ├─ commandline      # functions to read from command line 
│   ├─ common_utils     # common utility functions
│   ├─ data             # represents and handles a peer's local archive
│   └── graph           # represents a local graph of the peers
├─ ds                   # (main) discovery server
└── peer                # (main) peer

*Each module is a pair source+header.

How to test

First, compile with make all, then

1. Run the discovery server with ./ds 4242
2. Run at least three peers with ./peer <PeerPort>
3. Type help to see the commands available.

Examples

• Run get sum t 2021:09:08-2021:09:11 on a peer
• Run get var c on a peer
• RUn showpeers on the discovery server

Notes

The current date is fixed to "2021-09-14" in constants.h for testing purposes since the initial testing dataset is fixed.

Author

Paolo Salvatore Galfano (paolosalvatore.galfano@mail.polimi.it)