My-Torrent

A decentralized file distribution application implementing BitTorrent-inspired protocols for efficient peer-to-peer transfers. Supports files up to 1GB with intelligent peer selection and choking algorithms.

Getting Started

• Extract the archive and enter the src folder
• Build using javac *.java (requires OpenJDK 17.0.8.1+)
• Launch on each machine with ./compileJava

System Architecture

peerProcess.java

• Initializes peer configuration from Common.cfg and PeerInfo.cfg
• Manages peer registry using PeerDetails data structures
• Configures bitfield representation for file piece tracking
• Instantiates FileHandler for splitting files into transferable chunks
• Spawns client/server threads for connection management
• Orchestrates neighbor selection through SelectNeighbors and SelectOptNeighbor modules

PeerDetails.java

• Encapsulates individual peer state including ID, port, availability status, bitfield, and socket information
• Dynamically updates based on network communication

PeerClient.java

• Initiates TCP connections to preceding peers from PeerInfo.cfg
• Performs handshake protocol validation via Handshake.java
• Caches connection streams in peer objects
• Exchanges bitfield information upon successful authentication
• Delegates ongoing message processing to P2PMessageHandler

PeerServer.java

• Listens for inbound peer connections
• Validates incoming handshakes and responds accordingly
• Broadcasts local bitfield to new connections
• Launches P2PMessageHandler for post-handshake communication

Message.java

• Constructs protocol-compliant message objects
• Provides utilities for serialization, type identification (via MessageType.java), and payload extraction

P2PMessageHandler.java

• Central message routing and processing engine
• Implements type-specific handlers for all protocol messages
• Leverages Utils.java for transmission, interest evaluation, piece selection, and completion detection
• Coordinates with FileHandler.java for piece storage and file reconstruction

Logger.java

• Per-peer logging system tracking network events and file transfer activities

SelectNeighbors.java & SelectOptNeighbor.java

• Implements preferred neighbor selection based on download rates or random selection during initialization
• Manages optimistic unchoking by randomly selecting interested choked peers `