[WIP] Add comprehensive enhancement features for wrapify library

[Copilot]

Wrapify Enhancement Features Implementation

This PR implements a comprehensive set of enhancement features to transform wrapify from a basic response wrapper into a production-ready API middleware solution.

Implementation Plan

• Analyze existing codebase and understand current architecture
• Design implementation strategy maintaining backward compatibility
• Create enhanced directory structure for new features
• Implement core configuration management system
• Add caching layer with in-memory and Redis support
• Implement middleware adapters for popular frameworks (Gin, Echo, Fiber)
• Add security features (rate limiting, security headers, CORS)
• Implement observability features (metrics, logging, tracing)
• Add response transformation and streaming capabilities
• Create comprehensive testing utilities
• Build example applications demonstrating all features
• Update documentation and migration guide

Technical Approach

• Backward Compatibility: All existing APIs remain unchanged
• Modular Design: Features implemented as optional extensions
• Interface-Based: Extensible plugin architecture
• Configuration-Driven: Environment-based feature enablement
• Zero Dependencies: Core remains dependency-free with optional extensions
• Thread-Safe: All implementations support concurrent usage

Key Features to Implement

1. Performance & Caching: In-memory and Redis caching with TTL support
2. Security: Rate limiting, security headers, CORS, input validation
3. Observability: Prometheus metrics, structured logging, request tracing
4. Developer Experience: Enhanced error handling, testing utilities, examples
5. Framework Integration: Middleware adapters for popular Go frameworks
6. Advanced Features: Multi-format responses, streaming, transformation

Directory Structure

/
├── cache/           # Caching implementations
├── compression/     # Response compression  
├── config/          # Configuration management
├── examples/        # Example applications
├── health/          # Health check endpoints
├── logging/         # Structured logging
├── metrics/         # Prometheus metrics
├── middleware/      # Framework adapters
├── ratelimit/       # Rate limiting implementations
├── security/        # Security features
├── streaming/       # Response streaming
├── testing/         # Testing utilities
├── transform/       # Response transformation
└── validation/      # Input validation

This pull request was created as a result of the following prompt from Copilot chat.

Enhancement Features Implementation for Wrapify

Overview

Implement a comprehensive set of enhancement features to transform wrapify from a basic response wrapper into a production-ready API middleware solution. This implementation focuses on the highest-impact features that will significantly improve developer experience and production readiness.

Features to Implement

1. Performance & Caching Layer

• Response Caching: Implement in-memory and Redis-based caching with TTL support
• Cache Invalidation: Pattern-based cache invalidation mechanisms
• Compression Middleware: Gzip/deflate compression for large responses
• Response Streaming: Support for large dataset streaming

2. Observability & Monitoring

• Metrics Collection: Prometheus metrics integration for response times, error rates, status codes
• Structured Logging: Integration with popular Go logging frameworks (logrus, zap)
• Request Tracing: Basic request ID tracking and correlation
• Health Check Endpoints: Built-in health and readiness probe support

3. Security Enhancements

• Rate Limiting: Configurable rate limiting with sliding window and token bucket algorithms
• Security Headers: Automatic security headers (HSTS, X-Frame-Options, CSP, etc.)
• Input Validation: Built-in validators for common data types
• CORS Handling: Comprehensive CORS middleware

4. Developer Experience Improvements

• Configuration Management: Environment-based configuration with validation
• Error Handling: Enhanced error response formatting with stack traces (dev mode)
• Testing Utilities: Mock generators and test helpers
• Example Applications: Comprehensive examples showing all features

5. Advanced Response Features

• Multi-format Support: JSON, XML, CSV response formats
• Response Transformation: Field filtering, data masking capabilities
• Conditional Responses: ETag and Last-Modified header support
• Pagination Enhancement: Advanced pagination with cursor-based support

6. Framework Integration

• Popular Framework Adapters: Gin, Echo, Fiber middleware adapters
• HTTP Router Integration: Chi, Gorilla Mux support
• Graceful Shutdown: Proper graceful shutdown handling

Implementation Requirements

Directory Structure

/
├── cache/           # Caching implementations
├── compression/     # Response compression
├── config/          # Configuration management
├── examples/        # Example applications
├── health/          # Health check endpoints
├── logging/         # Structured logging
├── metrics/         # Prometheus metrics
├── middleware/      # Framework adapters
├── ratelimit/       # Rate limiting implementations
├── security/        # Security features
├── streaming/       # Response streaming
├── testing/         # Testing utilities
├── transform/       # Response transformation
└── validation/      # Input validation

Key Components to Create

1. Enhanced Core Wrapper (enhanced_wrapper.go)

   • Extended decorator pattern with new features
   • Plugin architecture for extensibility
   • Configuration-driven feature enablement

2. Caching System (cache/)

   • Interface-based caching with multiple backends
   • TTL support and cache invalidation
   • Cache statistics and monitoring

3. Metrics & Monitoring (metrics/)

   • Prometheus metrics collection
   • Custom metrics registration
   • Performance monitoring dashboards

4. Security Suite (security/)

   • Rate limiting with multiple algorithms
   • Security headers middleware
   • Input validation framework

5. Framework Adapters (middleware/)

   • Gin middleware adapter
   • Echo middleware adapter
   • Generic HTTP middleware

6. Configuration System (config/)

   • YAML/JSON configuration loading
   • Environment variable support
   • Configuration validation

7. Testing Framework (testing/)

   • Mock response generators
   • Test assertion helpers
   • Benchmark utilities

8. Examples & Documentation

   • Complete example applications
   • Performance benchmarks
   • Integration guides

Technical Specifications

Performance Requirements

• Sub-millisecond overhead for basic wrapping
• Configurable caching with 99% hit rate potential
• Compression ratios of 60-80% for JSON responses
• Support for 10k+ concurrent requests

Compatibility

• Go 1.19+ support
• Backward compatibility with existing wrapify API
• Zero-dependency core with optional extensions
• Thread-safe implementations

Quality Standards

• 95%+ test coverage
• Comprehensive benchmarks
• Race condition testing
• Memory leak prevention

Deliverables

1. Core Implementation: All enhancement features implemented
2. Documentation: Updated README with new features and examples
3. Tests: Comprehensive test suite with benchmarks
4. Examples: Working example applications demonstrating features
5. Migration Guide: Guide for upgrading from basic wrapify

This implementation will position wrapify as a comprehensive, production-ready API response wrapping solution while maintaining its clean decorator pattern approach.

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