rust-rabbit 1.2.0

A simple, reliable RabbitMQ client library for Rust. Easy to use with flexible retry mechanisms and minimal configuration.
Documentation
# Rust Rabbit Roadmap

This document outlines the planned evolution of the rust-rabbit library following its major simplification revamp. The roadmap is organized by priority and estimated complexity.

## Version 1.0 (Current - Simplified Foundation)

### ✅ Completed
- **Simple Publisher API**: Two-method interface (`publish_to_exchange`, `publish_to_queue`)
- **Auto-declaring Consumer**: Automatic queue/exchange setup with retry support
- **Flexible Retry System**: Exponential, linear, and custom delay patterns
- **Basic Connection Management**: Simple connection with auto-reconnection
- **Clean Dependencies**: Reduced from 15+ to 7 essential dependencies
- **Comprehensive Documentation**: User guides, examples, and API docs
- **Production Examples**: Real-world usage patterns and best practices

### 🎯 Goals Achieved
- ✅ Simplicity: Easy to use with minimal configuration
- ✅ Reliability: Built-in retry mechanisms and error handling
- ✅ Flexibility: Configurable retry strategies for different use cases
- ✅ Performance: Efficient message processing with configurable concurrency
## Version 1.1 - Enhanced Observability (Q1 2024)

### 🔍 Monitoring & Debugging
- **Basic Metrics Collection**
  - Message throughput (messages/second)
  - Retry counts and failure rates
  - Connection health status
  - Queue depth monitoring
  
- **Structured Logging Enhancement**
  - Consistent log format across all components
  - Configurable log levels per component
  - Request correlation IDs for tracing
  - Performance timing logs
  
- **Health Check Endpoint**
  - Simple HTTP endpoint for health monitoring
  - Connection status reporting
  - Queue connectivity verification
  - Optional Prometheus metrics export

### 📊 Implementation Priority
1. **High**: Basic metrics collection (2-3 weeks)
2. **Medium**: Enhanced logging (1-2 weeks)
3. **Low**: Health endpoint (1 week)

## Version 1.2 - Advanced Retry Patterns (Q2 2024)

### 🔄 Retry Enhancements
- **Circuit Breaker Pattern**
  - Automatic circuit opening on repeated failures
  - Configurable failure thresholds
  - Exponential backoff for circuit recovery
  - Per-queue circuit breaker state
  
- **Dead Letter Queue Improvements**
  - Custom DLQ routing strategies
  - Message inspection and reprocessing tools
  - Automatic poison message detection
  - TTL-based message expiration

- **Retry Policy Presets**
  - Pre-configured policies for common scenarios
  - Database operation retry patterns
  - API call retry strategies
  - File processing retry configurations

### 🎛️ Configuration Enhancements
- **Environment-based Configuration**
  - Support for `.env` files
  - Environment variable override patterns
  - Configuration validation and defaults
  - Runtime configuration updates

## Version 1.3 - Performance Optimization (Q3 2024)

### ⚡ Performance Features
- **Message Batching**
  - Configurable batch sizes for publishing
  - Time-based and size-based batching
  - Batch compression options
  - Atomic batch processing guarantees
  
- **Connection Pooling**
  - Optional connection pools for high-throughput scenarios
  - Configurable pool size and connection reuse
  - Automatic pool health management
  - Load balancing across connections

- **Memory Optimization**
  - Zero-copy message processing where possible
  - Configurable message buffering strategies
  - Memory usage monitoring and alerts
  - Automatic garbage collection tuning

### 📈 Benchmarking & Testing
- **Performance Benchmarks**
  - Standardized performance test suite
  - Throughput and latency measurements
  - Memory usage profiling
  - Comparison with other Rust AMQP libraries

## Version 1.4 - Extended Messaging Patterns (Q4 2024)

### 🏗️ Additional Patterns
- **Request-Response Pattern** (Simplified)
  - Correlation ID-based request matching
  - Timeout handling for responses
  - Multiple response handling
  - Load balancing for request handlers
  
- **Priority Queues**
  - Message priority levels (1-255)
  - Priority-based processing order
  - Queue priority configuration
  - Priority overflow handling
  
- **Message Deduplication**
  - Content-based deduplication
  - Time window deduplication
  - Custom deduplication strategies
  - Redis-backed deduplication store

### � Integration Support
- **Framework Integrations**
  - Axum/Warp HTTP server integration
  - Tokio task integration helpers
  - Serde serialization optimizations
  - Custom deserializer support

## Version 2.0 - Cloud-Native Features (2025)

### ☁️ Cloud Platform Support
- **Container Orchestration**
  - Kubernetes deployment examples
  - Docker Compose configurations
  - Health check integrations
  - Graceful shutdown handling
  
- **Service Discovery**
  - Consul integration
  - etcd support
  - Kubernetes service discovery
  - DNS-based discovery

- **Security Enhancements**
  - TLS/SSL connection encryption
  - SASL authentication mechanisms
  - Certificate-based authentication
  - Connection security auditing

### 🌐 Multi-Protocol Support
- **Protocol Extensions**
  - MQTT bridge support
  - HTTP webhook publishing
  - gRPC service integration
  - WebSocket real-time streaming

## Version 2.1+ - Advanced Enterprise Features

### 🏢 Enterprise Considerations
- **Message Transformation**
  - Built-in message format converters
  - Schema validation and evolution
  - Content filtering and routing
  - Message enrichment pipelines
  
- **Distributed Tracing**
  - OpenTelemetry integration
  - Jaeger/Zipkin support
  - Correlation ID propagation
  - Performance trace analysis
  
- **Administrative Tools**
  - CLI management tools
  - Queue inspection utilities
  - Message replay capabilities
  - Configuration management tools

## Principles for Future Development

### 🎯 Core Values
1. **Simplicity First**: Every feature must have a simple, obvious use case
2. **Backward Compatibility**: Major versions will maintain API stability
3. **Performance Conscious**: Features should not significantly impact base performance
4. **Documentation Driven**: Every feature needs comprehensive documentation and examples
5. **Testing Required**: All features must have unit tests and integration examples

### 🚫 Explicitly Out of Scope
- **Complex Event Sourcing**: Enterprise-grade event sourcing remains outside core library
- **Multi-Broker Support**: Focus remains on RabbitMQ exclusively
- **GUI Tools**: Command-line and programmatic interfaces only
- **Custom Protocol Implementation**: Stick to standard AMQP 0.9.1

## Community & Contribution

### 🤝 Contribution Guidelines
- **RFC Process**: Major features require RFC discussion
- **Feature Flags**: New features should be behind feature flags initially
- **Benchmark Requirements**: Performance-impacting changes need benchmarks
- **Documentation First**: Features start with documentation, then implementation

### 📢 Communication Channels
- **GitHub Issues**: Bug reports and feature requests
- **GitHub Discussions**: Architecture discussions and questions
- **Documentation Examples**: Real-world usage examples and patterns

## Migration Path

### 🔄 Upgrading from Complex Version
For users upgrading from the pre-1.0 complex version:

1. **Assessment Phase**: Identify which enterprise features you actually use
2. **Simplification**: Migrate to basic Publisher/Consumer patterns
3. **Retry Migration**: Convert complex retry logic to new retry configurations
4. **Testing**: Verify behavior with simplified APIs
5. **Performance Validation**: Ensure throughput meets requirements

### 📋 Migration Tools (Planned for v1.1)
- **Configuration Converter**: Tool to convert old configurations to new format
- **Feature Usage Analyzer**: Identify which enterprise features are actually used
- **Migration Guide**: Step-by-step migration instructions with examples
- **Compatibility Shims**: Temporary compatibility layer for gradual migration

## Release Schedule

### 🗓️ Estimated Timeline
- **v1.1**: 3 months (Observability)
- **v1.2**: 6 months (Advanced Retry)
- **v1.3**: 9 months (Performance)
- **v1.4**: 12 months (Extended Patterns)
- **v2.0**: 18 months (Cloud-Native)

### 🔄 Release Process
- **Monthly Patch Releases**: Bug fixes and minor improvements
- **Quarterly Minor Releases**: New features and enhancements
- **Yearly Major Releases**: Breaking changes and major new capabilities

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*This roadmap is a living document and will be updated based on community feedback, usage patterns, and emerging requirements. Priority and timeline adjustments will be made based on real-world usage and feedback.*

**Last Updated**: December 2024  
**Next Review**: March 2025