MicroserviceKit 0.1.0-beta

🚀 .NET 8 Microservice Template Generator

A powerful, configurable template generator for .NET 8 microservices with a modular "Lego blocks" approach. Generate production-ready microservices with Clean Architecture, DDD patterns, CQRS, containerization, and comprehensive testing.

✨ Features

🏗️ Architecture Levels

• MINIMAL: Single project for simple CRUD services (1-2 developers)
• STANDARD: 3-layer architecture for medium complexity (2-5 developers)
• ENTERPRISE: 4-layer architecture for complex services (5+ developers)
• AUTO: Intelligent selection based on your requirements

🧩 Modular Components

• Domain Layer: Aggregates, Entities, Value Objects, Domain Events
• Application Layer: Commands, Queries, Handlers, DTOs, Validation
• API Layer: REST Controllers with OpenAPI, Validation, Error Handling
• Infrastructure Layer: Repositories, DbContext, External Services
• Testing: Unit Tests, Integration Tests, Test Utilities

🐳 Containerization

• Docker: Intelligent Dockerfile generation for microservice and infrastructure
• Docker Compose: Orchestration with PostgreSQL, MongoDB, RabbitMQ
• Kubernetes: Production-ready manifests with HPA, Services, ConfigMaps

🔧 Technologies

• .NET 8 with latest C# features
• Wolverine for CQRS/Mediator (MIT license)
• AggregateKit for DDD base classes
• Entity Framework Core for persistence
• FluentValidation for input validation
• xUnit, FluentAssertions, Moq for testing

🚀 Quick Start

Installation

# Clone the repository
git clone https://github.com/your-repo/microservice-net8-ddd.git
cd microservice-net8-ddd

# Build the CLI tool
dotnet build src/CLI/MicroserviceGenerator.CLI/MicroserviceGenerator.CLI.csproj

# Install globally (optional)
dotnet pack src/CLI/MicroserviceGenerator.CLI/MicroserviceGenerator.CLI.csproj
dotnet tool install -g MicroserviceGenerator.CLI

Generate Your First Microservice

# Interactive mode - guided setup
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new OrderService --interactive

# Quick start with defaults
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new OrderService

# From configuration file
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new OrderService --config examples/enterprise-service.json

# Custom output directory
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new OrderService --output ./my-services/

📋 Configuration

Basic Configuration

{
  "ServiceName": "OrderService",
  "RootNamespace": "Company.OrderService",
  "Architecture": {
    "Level": "standard"
  },
  "Features": {
    "Api": {
      "Style": "controllers",
      "Documentation": true,
      "Versioning": true
    },
    "Persistence": {
      "WriteModel": "postgresql",
      "ReadModel": "mongodb"
    },
    "Messaging": {
      "Enabled": true,
      "Provider": "rabbitmq"
    }
  },
  "Domain": {
    "Aggregates": [
      {
        "Name": "Order",
        "Properties": [
          { "Name": "CustomerId", "Type": "Guid" },
          { "Name": "TotalAmount", "Type": "decimal" },
          { "Name": "Status", "Type": "OrderStatus" }
        ],
        "Operations": ["Create", "UpdateStatus", "Cancel"]
      }
    ]
  }
}

Architecture Levels

🏗️ Generated Structure

Standard Level

OrderService/
├── src/
│   ├── OrderService.Domain/           # Aggregates, Entities, Events
│   ├── OrderService.Application/      # Commands, Queries, Handlers
│   └── OrderService.Api/             # Controllers, DTOs, Middleware
├── tests/
│   ├── OrderService.UnitTests/       # Domain & Application tests
│   └── OrderService.IntegrationTests/ # API & Database tests
├── docker/
│   ├── microservice.Dockerfile       # Main application
│   ├── postgres.Dockerfile          # Write model
│   ├── mongodb.Dockerfile           # Read model
│   └── docker-compose.yml           # Full orchestration
└── k8s/
    ├── deployment.yaml              # Kubernetes deployment
    ├── service.yaml                 # Load balancer
    └── hpa.yaml                     # Auto-scaling

Enterprise Level

OrderService/
├── src/
│   ├── OrderService.Domain/          # Rich domain model
│   ├── OrderService.Application/     # Use cases & DTOs
│   ├── OrderService.Infrastructure/  # Persistence & External services
│   └── OrderService.Api/            # REST/gRPC endpoints
├── tests/
│   ├── OrderService.UnitTests/      # Fast, isolated tests
│   ├── OrderService.IntegrationTests/ # Database & API tests
│   └── OrderService.ArchitectureTests/ # Architecture compliance
└── deployment/                      # Full DevOps setup

🧪 Testing Strategy

Generated Test Types

Unit Tests

• Domain logic and business rules
• Command/Query handlers
• Value object validation
• Domain event handling

Integration Tests

• API endpoints with real database
• Repository implementations
• Message publishing/consuming
• External service integration

Architecture Tests

• Layer dependency rules
• Naming conventions
• Code quality metrics

Test Example

[Fact]
public async Task CreateOrder_WithValidData_ShouldReturnOrderId()
{
    // Arrange
    var command = new CreateOrderCommand(
        CustomerId: Guid.NewGuid(),
        Items: [new OrderItem("Product", 2, 10.00m)]
    );

    // Act
    var result = await _handler.Handle(command, CancellationToken.None);

    // Assert
    result.Should().NotBeEmpty();
    _mockRepository.Verify(x => x.AddAsync(
        It.IsAny<Order>(), 
        It.IsAny<CancellationToken>()), 
        Times.Once);
}

🐳 Docker & Kubernetes

Docker Compose (Development)

# Start all services
docker-compose up -d

# View logs
docker-compose logs -f orderservice

# Scale microservice
docker-compose up -d --scale orderservice=3

Kubernetes (Production)

# Deploy to Kubernetes
kubectl apply -f k8s/

# Check status
kubectl get pods -l app=orderservice

# Scale horizontally
kubectl scale deployment orderservice-deployment --replicas=5

# View auto-scaling
kubectl get hpa

🔄 Migration & Evolution

Migrate Existing Projects

# Analyze current project
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- migrate --analyze

# Preview migration to standard level
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- migrate --level standard --dry-run

# Execute migration
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- migrate --level standard

# View migration history
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- history

Smart Auto-Configuration

The generator automatically enables features based on complexity:

• DDD: Enabled when complexity >= medium
• CQRS: Enabled when multiple operations per aggregate
• Infrastructure Layer: Enabled when external dependencies detected
• Docker: Enabled for standard+ levels
• Kubernetes: Enabled for enterprise level

📚 Examples

Simple CRUD Service

dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new ProductCatalog --config examples/minimal-crud.json

Event-Driven Microservice

dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new OrderService --config examples/event-driven.json

Enterprise Service

dotnet run --project src/CLI/MicroserviceGenerator.CLI -- new PaymentService --config examples/enterprise-service.json

🛠️ Development

Prerequisites

• .NET 8 SDK
• Docker & Docker Compose
• Kubernetes (optional)

Build & Test

# Build solution
dotnet build

# Run tests
dotnet test

# Run CLI locally
dotnet run --project src/CLI/MicroserviceGenerator.CLI -- --help

Contributing

1. Fork the repository
2. Create feature branch: git checkout -b feature/amazing-feature
3. Commit changes: git commit -m 'Add amazing feature'
4. Push to branch: git push origin feature/amazing-feature
5. Open Pull Request

📖 Documentation

• Development Plan - Detailed roadmap and implementation status
• Usage Guide - Comprehensive usage examples
• Examples - Configuration examples for different scenarios
• Migration Guide - How to migrate existing projects

🎯 Roadmap

✅ Completed (Phase 1-2)

• Domain Layer generation with AggregateKit
• REST API Controllers with full CRUD
• Comprehensive Unit Testing
• CLI with interactive mode
• Smart architecture level selection

🚧 In Progress (Phase 3)

• Application Layer (Commands/Queries/Handlers)
• Infrastructure Layer (Repositories/DbContext)
• Integration Testing
• Docker & Kubernetes support

🔮 Planned (Phase 4+)

• gRPC API support
• Event Sourcing patterns
• Advanced CQRS with separate read/write models
• Observability (Logging, Metrics, Tracing)
• Performance optimization

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🤝 Support

• 📧 Email: support@microservice-generator.com
• 💬 Discussions: GitHub Discussions
• 🐛 Issues: GitHub Issues

Made with ❤️ for .NET developers who want to build better microservices faster.