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README.md

Toru: OCaml Data Repository Manager#

Toru is an OCaml library for managing data file downloads and caching, fully compatible with Python Pooch registry files. Built on the Eio effects system for efficient concurrent operations.

🚀 Features#

✅ Complete Implementation#

  • 🔒 Hash Verification: SHA256, SHA1, MD5 with automatic format detection
  • 📋 Registry Management: Full Pooch compatibility for registry files
  • 💾 Smart Caching: XDG-compliant cache with versioning and management APIs
  • 🔗 Multiple Download Methods: Modular system (wget/curl/future cohttp-eio)
  • 🔐 Authentication: Per-downloader HTTP Basic Auth support
  • ⚡ Concurrent Downloads: Efficient parallel downloads using Eio
  • 🛠️ CLI Tools: Cache management and inspection utilities
  • 🔄 Cross-Validation: Python/Pooch compatibility verified

🎯 Production Ready#

  • Type Safe: Leverages OCaml's type system for robust error handling
  • Well Tested: Comprehensive test suite with cross-validation against Python Pooch
  • Performance: Concurrent operations and efficient file handling
  • Modular: Clean interfaces with easy extensibility

📦 Installation#

# Clone the repository
git clone https://github.com/yourusername/toru
cd toru

# Build with dune
dune build

# Run tests
dune exec test/test_hash.exe
dune exec test/test_registry.exe  
dune exec test/test_cache.exe
dune exec test/test_python_cross_validation.exe

Dependencies#

  • eio (>= 1.0): Effects-based I/O
  • digestif (>= 1.0): Cryptographic hashes
  • yojson: JSON parsing
  • cmdliner: CLI argument parsing
  • ptime: Time handling
  • fmt: Formatted output with colors and styling

🔧 Usage#

Basic Library Usage#

open Eio.Std

let main ~env ~sw =
  (* Create a Toru instance *)
  let toru = Toru.create ~sw ~env
    ~base_url:"https://github.com/myorg/data/raw/main/"
    ~cache_path:"~/.myapp/data"
    ~version:"v1.0"
    ~registry_file:"registry.txt"
    () in
  
  (* Fetch a single file *)
  match Toru.fetch toru ~filename:"data.csv" () with
  | Ok path -> 
      traceln "File available at: %s" (Eio.Path.native_exn path)
  | Error msg -> 
      traceln "Failed to fetch: %s" msg
  
  (* Download all files concurrently *)
  match Toru.fetch_all toru ~concurrency:4 () with
  | Ok () -> traceln "Downloaded all files successfully"
  | Error msg -> traceln "Download failed: %s" msg

Hash Module#

open Toru.Hash

(* Parse hash with automatic format detection *)
let hash1 = of_string "sha1:abc123def456789"
let hash2 = of_string "d1f947c87017eebc8b98d6c3944eaea813dd..."  (* SHA256 by length *)

(* Compute and verify file hashes *)
let file_hash = compute SHA256 file_path in
let is_valid = verify file_path expected_hash in

Registry Management#

open Toru.Registry

(* Load Pooch-compatible registry *)
let registry = load registry_path in

(* Query registry *)
match find "data.csv" registry with
| Some entry ->
    let hash = hash entry in
    let filename = filename entry in
    printf "Found %s with hash %s\n" filename (Hash.to_string hash)
| None -> printf "File not found\n"

(* Create and save registry *)
let entry = create_entry ~filename:"data.csv" ~hash:computed_hash () in
let updated_registry = add entry registry in
save output_path updated_registry

Cache Management#

open Toru.Cache

(* Create cache with XDG compliance *)
let cache = create ~sw ~env ~version:"v1.0" "/path/to/cache" in

(* Check file existence and get paths *)
let file_path = file_path cache "data.csv" in
let exists = exists cache "data.csv" in

(* Management operations *)
let stats = usage_stats cache in
printf "Cache size: %Ld bytes, %d files\n" stats.total_size stats.file_count;

(* Clean up cache *)
trim_to_size cache (1024L * 1024L * 1024L);  (* 1GB limit *)
vacuum cache;  (* Remove empty directories *)

🖥️ CLI Tools#

Cache Management#

# Show cache information
toru-cache info

# List cached files
toru-cache list --sort=size --limit=10

# Show size breakdown  
toru-cache size --breakdown --human-readable

# Clean cache (dry run)
toru-cache clean --max-size=1GB --dry-run

# Remove files older than 30 days
toru-cache clean --max-age=30

# Clean up empty directories
toru-cache vacuum

🔬 Python Compatibility#

Toru is fully compatible with Python Pooch registries. We provide comprehensive cross-validation tests:

# Generate Python test data (requires uv)
cd test/python && uv run generate_pooch_registry.py

# Run cross-validation tests
dune exec test/test_python_cross_validation.exe

Registry Format Support#

Standard Pooch Format:

# Comments supported
data/file1.csv d1f947c87017eebc8b98d6c3944eaea813ddcfb6ceafa96db0bb70675abd4f28
data/file2.txt sha1:0a0a9f2a6772942557ab5355d76af442f8f65e01
archive.zip md5:65a8e27d8879283831b664bd8b7f0ad4

Mixed Format Support:

  • SHA256: filename hash or filename sha256:hash
  • SHA1: filename sha1:hash
  • MD5: filename md5:hash
  • Automatic detection by hash length for unprefixed formats

🏗️ Architecture#

Modular Design#

  • Hash Module: Multi-algorithm support with verification
  • Registry Module: Pooch-compatible parsing and management
  • Cache Module: XDG-compliant storage with management APIs
  • Downloader Modules: Pluggable download implementations
  • Main Toru Module: High-level interface combining all components

Download Strategy#

  1. Phase 1 (Current): External tools (wget/curl) for immediate functionality
  2. Phase 2 (Future): Pure OCaml implementation (cohttp-eio)
  3. Benefits: Battle-tested tools now, migration path to pure OCaml later

Authentication Support#

Per-downloader authentication configuration:

  • Environment variables: TORU_WGET_USERNAME, TORU_CURL_USERNAME, etc.
  • CLI arguments: --wget-username, --curl-password, etc.
  • Programmatic API: Auth configuration per downloader type

🧪 Testing#

Comprehensive Test Suite#

# Core module tests
dune exec test/test_hash.exe
dune exec test/test_registry.exe
dune exec test/test_cache.exe
dune exec test/test_downloader.exe

# Integration tests  
dune exec test/test_python_cross_validation.exe
dune exec test/test_cache_xdg.exe

# All tests
dune runtest

Cross-Validation#

  • Python Generator: Creates test data using Python Pooch
  • OCaml Validation: Verifies compatibility with generated data
  • Format Testing: All hash formats and registry variations
  • Round-trip Testing: Parse → serialize → parse consistency

📈 Performance#

  • Concurrent Downloads: Configurable parallelism using Eio
  • Efficient Hashing: Streaming for large files, optimized algorithms
  • Smart Caching: Only downloads when needed, hash verification
  • Memory Efficient: Streaming I/O, minimal memory footprint

🛣️ Roadmap#

Completed ✅#

  • Core hash verification (SHA256/SHA1/MD5)
  • Pooch-compatible registry parsing
  • XDG-compliant caching with management APIs
  • External tool download system (wget/curl)
  • Per-downloader authentication
  • Comprehensive CLI tools
  • Python cross-validation testing

In Progress 🚧#

  • Main Toru interface implementation
  • make_registry utility for directory scanning
  • Retry mechanisms with exponential backoff

Planned 📋#

  • Pure OCaml HTTP client (cohttp-eio)
  • SFTP protocol support
  • DOI resolution (Zenodo/Figshare)
  • Advanced archive processing
  • Progress reporting enhancements

🤝 Contributing#

  1. Fork the repository
  2. Create a feature branch
  3. Add tests for new functionality
  4. Ensure all tests pass: dune runtest
  5. Submit a pull request

📄 License#

MIT License - see LICENSE file for details.

🙏 Acknowledgments#

  • Python Pooch - Inspiration and compatibility target
  • Eio - Modern effects-based I/O
  • digestif - Cryptographic hashing
  • OCaml community for excellent libraries and tools

Toru: Your OCaml companion for data repository management! 🦀⚡