Changelog

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All notable changes to this project will be documented in this file.

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

0.0.1 - 2025-06-09

Added

Core Features

  • Dual Authentication System: Support for both Gemini API keys and Vertex AI OAuth/Service Accounts
  • Advanced Streaming: Production-grade Server-Sent Events (SSE) streaming with real-time processing
  • Comprehensive API Coverage: Full support for Gemini API endpoints including content generation, model listing, and token counting
  • Type Safety: Complete TypeScript-style type definitions with runtime validation
  • Error Handling: Detailed error types with recovery suggestions and proper HTTP status code mapping
  • Built-in Telemetry: Comprehensive observability with metrics and event tracking
  • Chat Sessions: Multi-turn conversation management with state persistence
  • Multimodal Support: Text, image, audio, and video content processing

Authentication

  • Multi-strategy authentication coordinator with automatic strategy selection
  • Environment variable and application configuration support
  • Per-request authentication override capabilities
  • Secure credential management with validation
  • Support for Google Cloud Service Account JSON files
  • OAuth2 Bearer token generation for Vertex AI

Streaming Architecture

  • Unified streaming manager with state management
  • Real-time SSE parsing with event dispatching
  • Configurable buffer management and backpressure handling
  • Stream lifecycle management (start, pause, resume, stop)
  • Event subscription system with filtering capabilities
  • Comprehensive error recovery and retry mechanisms

HTTP Client

  • Dual HTTP client system (standard and streaming)
  • Request/response interceptors for middleware support
  • Automatic retry logic with exponential backoff
  • Connection pooling and timeout management
  • Request validation and response parsing
  • Content-Type negotiation and encoding support

Type System

  • Comprehensive type definitions for all API structures
  • Runtime type validation with descriptive error messages
  • Request and response schema validation
  • Content type definitions for multimodal inputs
  • Model capability and configuration types
  • Error type hierarchy with actionable information

Configuration

  • Hierarchical configuration system (runtime > environment > application)
  • Environment variable detection and parsing
  • Application configuration validation
  • Default value management
  • Configuration hot-reloading support

Utilities

  • Content extraction helpers
  • Response transformation utilities
  • Validation helpers
  • Debugging and logging utilities
  • Performance monitoring tools

Technical Implementation

Architecture

  • Layered architecture with clear separation of concerns
  • Behavior-driven design for pluggable components
  • GenServer-based application supervision tree
  • Concurrent request processing with actor model
  • Event-driven streaming with backpressure management

Dependencies

  • req ~> 0.4.0 for HTTP client functionality
  • jason ~> 1.4 for JSON encoding/decoding
  • typed_struct ~> 0.3.0 for type definitions
  • joken ~> 2.6 for JWT handling in Vertex AI authentication
  • telemetry ~> 1.2 for observability and metrics

Development Tools

  • ex_doc for comprehensive documentation generation
  • credo for code quality analysis
  • dialyxir for static type analysis

Documentation

  • Complete API reference documentation
  • Architecture documentation with Mermaid diagrams
  • Authentication system technical specification
  • Getting started guide with examples
  • Advanced usage patterns and best practices
  • Error handling and troubleshooting guide

Security

  • Secure credential storage and transmission
  • Input validation and sanitization
  • Rate limiting and throttling support
  • SSL/TLS enforcement for all communications
  • No sensitive data logging

Performance

  • Optimized for high-throughput scenarios
  • Memory-efficient streaming implementation
  • Connection reuse and pooling
  • Minimal latency overhead
  • Concurrent request processing