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Changelog

All notable changes to the Hyperliquid Dart SDK will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[1.0.0] - 2024-01-15

🚀 Major Release - Production Ready

This is the first production-ready release of the Hyperliquid Dart SDK with comprehensive features, security, and reliability improvements.

✨ Added

Core Features

  • Complete REST API Coverage: Full implementation of all Hyperliquid REST endpoints
  • WebSocket Real-time Data: Comprehensive WebSocket subscriptions for live market data
  • Type-safe API: Strongly typed interfaces with comprehensive error handling
  • Multi-environment Support: Seamless switching between testnet and mainnet

Security & Validation

  • Private Key Security: Advanced private key validation with entropy checking
  • Input Sanitization: Comprehensive input validation and sanitization
  • Rate Limiting: Built-in rate limiting with configurable thresholds
  • Security Event Logging: Detailed security event tracking and monitoring

Error Handling & Reliability

  • Automatic Retry: Intelligent retry mechanisms with exponential backoff
  • Circuit Breaker: Circuit breaker pattern for fault tolerance
  • Recovery Strategies: Customizable error recovery strategies
  • Comprehensive Error Tracking: Detailed error statistics and monitoring

Logging & Observability

  • Structured Logging: JSON-formatted logs with contextual information
  • Performance Metrics: Built-in performance monitoring and metrics
  • Security Monitoring: Comprehensive security event logging
  • Production Logging: File-based logging with rotation support

Developer Experience

  • Comprehensive Documentation: Extensive documentation with examples
  • Production Guide: Detailed production deployment guide
  • Example Applications: Complete example applications demonstrating all features
  • Testing Suite: Comprehensive test coverage with integration tests

🛡️ Security Features

  • Private Key Validation:

    • Format validation (64 hex characters with optional 0x prefix)
    • Weak key detection (all zeros, patterns, etc.)
    • Entropy analysis with warnings for low-entropy keys
    • Secure storage recommendations

  • Input Validation & Sanitization:

    • Trading amount validation with configurable min/max limits
    • Price validation with reasonable bounds
    • Leverage validation (1-100x with warnings >50x)
    • Slippage validation (0-100% with warnings >10%)
    • Symbol format validation
    • Address format validation
    • XSS prevention (removes dangerous HTML characters)
    • SQL injection prevention
    • Control character removal
    • Length limiting (max 10,000 characters)

  • Rate Limiting & Monitoring:

    • API call tracking (1200 calls/minute default)
    • Warning at 80% of rate limit
    • WebSocket subscription limits (1000 max)
    • Configurable enforcement levels

🔧 Technical Improvements

  • Error Handling:

    • Automatic retry with exponential backoff
    • Custom recovery strategies per error type
    • Comprehensive error statistics
    • Error history tracking (last 1000 errors)
    • Configurable retry attempts and delays

  • Logging System:

    • JSON-formatted structured output
    • Global context management
    • Specialized log types (API, WebSocket, Trading, Security)
    • Performance metric logging
    • File logging with rotation
    • Configurable log levels

  • WebSocket Improvements:

    • Automatic reconnection with backoff
    • Connection state monitoring
    • Subscription management
    • Message queuing during disconnections
    • Heartbeat monitoring

📊 API Enhancements

REST API

  • Info API: Complete market data and account information endpoints
  • Exchange API: Full trading operations with advanced order types
  • Custom Operations: Batch operations and specialized trading functions
  • Symbol Conversion: Automatic symbol to asset index conversion

WebSocket API

  • User Events: Real-time order updates, fills, and liquidations
  • Market Data: Live price feeds and order book updates
  • Trade Feeds: Real-time trade data for specific symbols
  • System Notifications: Important system announcements

🧪 Testing & Quality

  • Comprehensive Test Suite:

    • Unit tests for all core functionality
    • Integration tests with live API
    • Security validation tests
    • Error handling tests
    • Performance tests
    • WebSocket connection tests

  • Code Quality:

    • Static analysis with strict linting rules
    • Type safety enforcement
    • Documentation coverage
    • Performance profiling

📚 Documentation

  • Complete API Documentation: Detailed documentation for all classes and methods
  • Production Deployment Guide: Comprehensive guide for production deployment
  • Security Best Practices: Detailed security recommendations
  • Example Applications: Multiple example applications demonstrating features

🐛 Bug Fixes

  • Fixed WebSocket reconnection issues
  • Resolved rate limiting edge cases
  • Corrected symbol conversion for new assets
  • Fixed memory leaks in long-running connections
  • Resolved timezone issues in timestamp handling

📈 Performance Improvements

  • Optimized JSON serialization/deserialization
  • Improved WebSocket message handling
  • Reduced memory footprint
  • Enhanced connection pooling
  • Optimized rate limiting algorithms

🚀 Production Features

  • Health Checks: Built-in health check endpoints
  • Metrics Export: Prometheus-compatible metrics export
  • Graceful Shutdown: Proper resource cleanup on shutdown
  • Resource Management: Automatic resource cleanup and management