MongoDB Connection Architecture Refactor

🚀 🚀 Release Notes - MongoDB Connection Architecture Refactor

📋 Overview

This release represents a major architectural overhaul focused on MongoDB connection management, dependency upgrades, code organization improvements, and comprehensive test coverage enhancement. The changes improve maintainability, reliability, and follow Go best practices.

✨ Major Features & Improvements

🔧 MongoDB Connection Architecture Redesign

• Complete refactor of MongoDB connection management from internal/db to dedicated pkg/mongodb package
• New modular connection system with support for:
  • MongoDB and MongoDB+SRV connection schemes
  • Configurable options using functional pattern (replica sets, read preferences, write concerns)
  • Credential management via sidecar files
  • Connection URL masking for security
  • Comprehensive connection validation and error handling

📦 Package Restructuring & Clean Architecture

• Migrated logger from internal/logger to pkg/logger for better reusability
• Extracted configuration management to dedicated internal/config package
• Improved separation of concerns with cleaner package boundaries

🏗️ Server & Application Improvements

• Enhanced graceful shutdown with proper context cancellation handling
• Improved server lifecycle management with better error handling
• Streamlined main application logic with cleaner separation of setup phases
• Better configuration loading and validation

🔄 Dependency Updates

• MongoDB Driver 1.17.4 (latest stable release)
• Gin Framework 1.11.0 (latest version with security fixes)
• Updated all dependencies to latest stable versions for security and performance

🛠️ Technical Changes

New Packages & Components

pkg/mongodb/          # MongoDB connection management
├── connection.go     # Connection manager implementation
├── options.go        # Connection options and functional patterns
├── types.go          # Type definitions and credentials
└── url.go            # Connection URL building and validation

pkg/logger/           # Structured logging with zerolog
├── logger.go         # Logger interface and implementation
└── logger_test.go    # Comprehensive logger tests

internal/config/      # Configuration management
├── config.go         # Environment configuration loading
└── config_test.go    # Configuration validation tests

Removed/Refactored Components

• ❌ internal/db/connection.go → ✅ pkg/mongodb/connection.go
• ❌ internal/db/connectionURL.go → ✅ pkg/mongodb/url.go
• ❌ internal/logger/ → ✅ pkg/logger/
• ❌ internal/util/ → ✅ internal/utilities/

🔒 Security Enhancements

• Input validation for all MongoDB connection parameters
• Updated dependencies with latest security patches

🚀 DevOps & CI/CD Improvements

• Enhanced Makefile with comprehensive test coverage reporting
• Improved Docker configuration for local development
• VS Code workspace settings for consistent development experience

🐛 Bug Fixes & Stability

• Improved error handling with proper error wrapping and context
• Enhanced graceful shutdown preventing resource leaks

🔄 Breaking Changes

⚠️ API Changes (internal packages only - no public API changes):

• MongoDB connection interfaces moved from internal/db to pkg/mongodb
• Logger interface relocated to pkg/logger
• Configuration structure updated in internal/config

🎯 Migration Guide

For developers working with the codebase:

1. Import path updates for MongoDB connections:

   // Old
   import "github.com/rameshsunkara/go-rest-api-example/internal/db"
   
   // New  
   import "github.com/rameshsunkara/go-rest-api-example/pkg/mongodb"

2. Logger import changes:

   // Old
   import "github.com/rameshsunkara/go-rest-api-example/internal/logger"
   
   // New
   import "github.com/rameshsunkara/go-rest-api-example/pkg/logger"