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Torrust Tracker Package Architecture

packages/
├── axum-health-check-api-server
├── axum-http-tracker-server
├── axum-rest-tracker-api-server
├── axum-server
├── clock
├── configuration
├── http-protocol
├── http-tracker-core
├── located-error
├── primitives
├── rest-tracker-api-client
├── rest-tracker-api-core
├── server-lib
├── test-helpers
├── torrent-repository
├── tracker-client
├── tracker-core
├── udp-protocol
├── udp-tracker-core
└── udp-tracker-server

console/
└── tracker-client      # Client for interacting with trackers

contrib/
└── bencode             # Community-contributed Bencode utilities

Package Conventions

Prefix Responsibility Dependencies
axum-* HTTP server components using Axum Axum framework
*-server Server implementations Corresponding *-core
*-core Domain logic & business rules Protocol implementations
*-protocol BitTorrent protocol implementations BitTorrent protocol
udp-* UDP Protocol-specific implementations Tracker core
http-* HTTP Protocol-specific implementations Tracker core

Key Architectural Principles:

  1. Separation of Concerns: Servers contain only network I/O logic.
  2. Protocol Compliance: *-protocol packages strictly implement BEP specifications.
  3. Extensibility: Core logic is framework-agnostic for easy protocol additions.

Package Catalog

Package Description Key Responsibilities
axum-*
axum-server Base Axum HTTP server infrastructure HTTP server lifecycle management
axum-http-tracker-server BitTorrent HTTP tracker (BEP 3/23) Handle announce/scrape requests
axum-rest-tracker-api-server Management REST API Tracker configuration & monitoring
axum-health-check-api-server Health monitoring endpoint System health reporting
Core Components
http-tracker-core HTTP-specific implementation Request validation, Response formatting
udp-tracker-core UDP-specific implementation Connectionless request handling
tracker-core Central tracker logic Peer management
Protocols
http-protocol HTTP tracker protocol (BEP 3/23) Announce/scrape request parsing
udp-protocol UDP tracker protocol (BEP 15) UDP message framing/parsing
Domain
torrent-repository Torrent metadata storage InfoHash management, Peer coordination
configuration Runtime configuration Config file parsing, Environment variables
primitives Domain-specific types InfoHash, PeerId, Byte handling
Utilities
clock Time abstraction Mockable time source for testing
located-error Diagnostic errors Error tracing with source locations
test-helpers Testing utilities Mock servers, Test data generation
Client Tools
tracker-client CLI client Tracker interaction/testing
rest-tracker-api-client API client library REST API integration

Protocol Implementation Details

HTTP Tracker (BEP 3/23)

  • http-protocol implements:
    • URL parameter parsing
    • Response bencoding
    • Error code mapping
    • Compact peer formatting

UDP Tracker (BEP 15)

  • udp-protocol handles:
    • Connection ID management
    • Message framing (32-bit big-endian)
    • Transaction ID tracking
    • Error response codes

Architectural Philosophy

  1. Testability: Core packages have minimal dependencies for easy unit testing
  2. Observability: Health checks and metrics built into server packages
  3. Modularity: Protocol implementations decoupled from transport layers
  4. Extensibility: New protocols can be added without modifying core logic

Torrust Tracker Architecture Diagram

Diagram shows clean separation between network I/O (servers), protocol handling, and core tracker logic