clean architecture in go

Clean Architecture is a software architecture pattern that separates the high-level software design concepts from the implementation details. The Clean Architecture consists of several layers, and the dependencies between these layers should only flow inward. This principle is known as the Dependency Rule.

To implement Clean Architecture in Go, we can start by dividing our application into several layers:

• Domain Layer: This layer contains the business logic of the application. It is the core of the application and is independent of the infrastructure and other layers. In Go, we can organize the domain layer into packages based on business logic.
• Infrastructure Layer: This layer interacts with the external world, such as databases, message brokers, and external APIs. It should be separated from the domain layer to keep it decoupled. In Go, we can use interfaces to define the contracts for infrastructure services and implement them in separate packages.
• Delivery Layer: This layer is responsible for delivering the application to end-users or external systems. It can be a RESTful API, a command-line interface, or a web server. In Go, we can implement this layer using third-party packages such as Gorilla Mux or the standard net/http package.

Here's an example directory structure for a sample Go application using Clean Architecture:

main.go
- cmd/
   - main.go
- internal/
   - domain/
      - entity/
      - repository/
      - usecase/
   - infrastructure/
      - repository/
         - user_repository.go
      - service/
         - email_service.go
      - web/
         - handler/
- pkg/
   - config/
   - log/
- vendor/
- Dockerfile
- docker-compose.yml
- Makefile
332 chars
22 lines

In this example, the cmd directory contains the entry point to the application. The internal directory contains the domain and infrastructure layers, and the pkg directory contains shared packages that can be used across different layers.

We can organize our code within the domain package by using separate sub-packages for entities, repositories, and use cases. Similarly, we can use sub-packages within infrastructure for repositories, services, and web handlers.

Overall, implementing Clean Architecture in Go involves separating the application into independent and loosely coupled layers, which is a key principle of software design.