Skip to content

IMPLEMENTATION.md

Latest commit

 

History

History
168 lines (107 loc) · 4.22 KB

IMPLEMENTATION.md

File metadata and controls

168 lines (107 loc) · 4.22 KB

Distributed File Transfer System

A high-reliability file transfer system designed for unstable, real-world networks. Built around dynamic chunking, compression, hashing, adaptive protocols, encryption, and optional peer-to-peer transfer using WebRTC.

This system is engineered for environments where standard upload mechanisms fail — mobile networks, fluctuating bandwidth, emergency vehicles, remote areas, and large-file transfers.

🎉 Latest Update: Adaptive Network Monitoring (Nov 15, 2025)

Real-Time Network Optimization

Added continuous network monitoring that automatically adjusts upload parameters based on live network conditions:

  • Background Monitoring: Web Worker runs network tests every second without blocking UI
  • Dynamic Chunk Sizing: Automatically adjusts from 5KB (2G) to 20MB (5G+)
  • Smart Worker Allocation: Scales from 1 to 8 parallel workers based on network quality
  • Zero Performance Impact: <0.1% CPU usage, ~50KB memory footprint
  • Quality Classification: Real-time network quality indicators (poor/fair/good/excellent)
  • Latency & Jitter Tracking: Monitors network stability for optimal upload reliability

See ADAPTIVE_NETWORK_MONITORING.md for detailed documentation.

🚀 Features (Current Implementation)

1. File Preparation (Client Side)

  • Reads the input file.
  • Compresses it to optimize bandwidth usage.
  • Generates an xxHash hash of the compressed file for end-to-end integrity.

2. Dynamic Chunking Engine

Chunk size is calculated on the fly based on real-time network speed.

  • High speed → Larger chunks
  • Low/unstable speed → Smaller chunks

Each chunk includes:

  • Chunk index
  • Total chunks
  • xxHash hash
  • File metadata

3. Secure Chunk Transmission

  • Each chunk is verified on the server using its xxHash hash.
  • Corrupted/mismatched chunks are re-requested.
  • No need to retransmit the whole file.

4. Server-Side Reassembly

Once all chunks are received:

  1. Sort by index
  2. Reassemble
  3. Decompress
  4. Hash the final file
  5. Compare with the original client hash

If the hashes match → upload complete. If not → problematic chunks are fetched again.

🛠 Future Enhancements

1. Adaptive Protocol Switching

Depending on current network quality:

  • HTTP/2 / gRPC for stable networks
  • QUIC / HTTP/3 for mobile or fluctuating networks
  • TLS 1.3 secured mode for sensitive transfers

Protocol switching will happen automatically during transfer.

2. End-to-End Encryption

Planned upgrades include:

  • AES-256 per chunk encryption
  • Diffie–Hellman / TLS key exchange
  • Per-chunk nonce to prevent replay attacks

This ensures full confidentiality even if packets are intercepted.

3. Network-Aware Chunk Rebalancing

The transfer engine continuously monitors:

  • Latency
  • Bandwidth
  • Jitter
  • Packet loss

When the network changes (example: moving in an ambulance):

  • The system instantly recalculates chunk sizes
  • Transfer continues without restarting

4. Intelligent Resume Logic

If the connection drops:

  • Upload resumes from the last acknowledged chunk
  • No duplication
  • No corrupt alignment due to hashing

Future upgrades:

  • Forward Error Correction (FEC)
  • Multi-path chunk routing

🔗 WebRTC Client-to-Client Transfer

1. Direct P2P Data Channel

The system will integrate WebRTC for:

  • Client → Client direct file transfers
  • Zero server bandwidth usage
  • Lower latency
  • Higher speed

Server is used only for signaling (connection setup).

2. Security on WebRTC

  • Built-in DTLS
  • Additional AES-256 encryption
  • Per-chunk xxHash validation

3. Dynamic Chunking Still Applies

Adaptive chunking works even over WebRTC:

  • WiFi → large chunks
  • Weak network → smaller chunks

This guarantees smooth P2P transfers.

🎯 Why This System Stands Out

Unlike traditional upload systems, this architecture is built for real-world failure conditions:

  • Fluctuating mobile networks
  • Emergency environments
  • Large and sensitive files
  • P2P scenarios
  • Low bandwidth regions

Backed by:

  • Dynamic chunking
  • Compression
  • Hashing at both levels
  • Protocol adaptivity
  • Strong encryption
  • Resume logic
  • Optional WebRTC transfer

This system isn't just an uploader — it's a resilient file transfer engine.