BitTorrentClient

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BitTorrentClient

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# BitTorrent Client

A production-ready BitTorrent v1 client implementation in Python following the [official protocol specification](http://www.bittorrent.org/beps/bep_0003.html). Supports complete torrent downloads with request pipelining and parallel peer connections.

## Quick Start

```bash
# Install
pip install -e ".[dev]"

# Download a torrent
python download_torrent.py big-buck-bunny.torrent

# Inspect torrent metadata
python inspect_torrent.py ubuntu.torrent
```

## Features

**Protocol Implementation**
- Bencode encoding/decoding with strict validation
- .torrent file parsing (single-file and multi-file)
- SHA-1 infohash computation
- HTTP/HTTPS tracker protocol (bencoded)
- UDP tracker protocol (BEP 15)
- Complete peer wire protocol with all standard messages
- Automatic tracker fallback

**Storage & Download**
- Multi-file storage with global address space mapping
- Piece spanning across file boundaries
- Path traversal attack prevention
- Piece and block management with SHA-1 verification
- Request pipelining (50 requests per peer)
- Parallel peer connections (up to 10 concurrent)
- Thread-safe operations with proper locking
- Real-time progress tracking and statistics

**Performance Optimizations**
- Request pipelining reduces round-trip latency
- Concurrent peer connections via ThreadPoolExecutor
- Fast connection timeout (5s) for unresponsive peers
- Direct file I/O with efficient offset calculations

## Installation

```bash
git clone https://github.com/HickoDev/BitTorrentClient
cd BittorentClient
pip install -e ".[dev]"
pytest  # Verify installation
```

**Requirements:** Python 3.10+, pytest (dev only)

## Usage

### Parse Torrent Files

```python
from bt.metainfo import parse_torrent, format_infohash

meta = parse_torrent('ubuntu-22.04.torrent')
print(f"Infohash: {format_infohash(meta.infohash)}")
print(f"Size: {meta.total_length} bytes")
print(f"Pieces: {len(meta.piece_hashes)}")
```

### Connect to Trackers

```python
from bt.tracker import announce_simple_with_fallback

response, url = announce_simple_with_fallback(
    tracker_urls=trackers,
    infohash=meta.infohash,
    total_length=meta.total_length,
    port=6881
)
print(f"Peers: {len(response.peers)}")
```

### Download Torrents

```python
from bt.storage import TorrentStorage
from bt.pieces import PieceManager
from bt.wire import PeerConnection

storage = TorrentStorage(meta.files, './downloads', meta.piece_length)
storage.preallocate()
piece_manager = PieceManager(meta, storage)

# See download_torrent.py for complete implementation
```

### Command-Line Tools

```bash
python download_torrent.py file.torrent [output_dir]
python inspect_torrent.py file.torrent
python test_real_tracker.py file.torrent
python test_download_piece.py file.torrent
```

## Testing

```bash
pytest                              # Run all tests
pytest --cov=bt --cov-report=html   # With coverage

# Individual modules
pytest tests/test_bencode.py
pytest tests/test_metainfo.py
pytest tests/test_storage.py
pytest tests/test_tracker.py
pytest tests/test_wire.py
pytest tests/test_pieces.py
```

## Architecture

```
bt/
├── bencode.py          # Bencode encoding/decoding
├── metainfo.py         # .torrent parser + infohash
├── storage.py          # Multi-file storage manager
├── tracker_http.py     # HTTP/HTTPS tracker protocol
├── tracker_udp.py      # UDP tracker protocol (BEP 15)
├── tracker.py          # Unified tracker interface
├── wire.py             # Peer wire protocol
├── pieces.py           # Piece and block management
└── utils.py            # Utilities

tests/                  # Comprehensive test suite
download_torrent.py     # CLI download client
inspect_torrent.py      # Torrent metadata inspector
```

## Development Status

**Completed**
- Bencode encoding/decoding
- Torrent file parsing
- HTTP/HTTPS and UDP tracker protocols
- Peer wire protocol
- Download pipeline with pipelining and parallelization
- Multi-file storage management
- Comprehensive test coverage

**Future Enhancements**
- DHT support for trackerless torrents
- Magnet link support
- Upload/seeding capability
- Resume partial downloads
- Rate limiting and bandwidth control

## License

MIT

## References

- [BitTorrent Protocol Specification (BEP 3)](http://www.bittorrent.org/beps/bep_0003.html)
- [UDP Tracker Protocol (BEP 15)](http://www.bittorrent.org/beps/bep_0015.html)

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