Clean Architecture in Microservices Demo

Introduction

If you're very new to Clean Architecture, I recommend you check more simple demo.

This repo was built up with three services: Task, User and Auth. Each of them conforms Clean Architecture.

Folder structure

Let's focus on directories in /services:

services
├── auth
│   ├── business
│   ├── entity
│   ├── repository
│   │   ├── mysql
│   │   └── rpc
│   └── transport
│       ├── api
│       └── rpc
├── task
│   ├── business
│   ├── entity
│   ├── repository
│   │   ├── mysql
│   │   └── rpc
│   └── transport
│       └── api
└── user
    ├── business
    ├── entity
    ├── repository
    │   └── mysql
    └── transport
        ├── api
        └── rpc

Protobuf and generated files at proto folder:

├── auth.proto
├── pb
│   ├── auth.pb.go
│   ├── auth_grpc.pb.go
│   ├── user.pb.go
│   └── user_grpc.pb.go
└── user.proto

Microservices in this demo

Instead of separating to 3 repos on GitHub, I merged them to a single repo to give more transparent and convenience to build up the demo. But the services are isolated with each others.

Service stacks:

• GIN (for HTTP service)
• gRPC (internal rpc)
• MySQL (with GORM)
• JWT

Task Service

• REST API: CRUD Task (require authorization for all apis)
• gRPC: None

User Service

• REST API:
  • Get user profile (require authorization)
• gRPC:
  • Get public user info by ID
  • Get many public user infos by IDs

Auth Service

• REST API:
  • Register new user account
  • Login (issue JWT)
• gRPC:
  • Introspect Access Token

The Diagrams

Some of main diagrams to demonstration how they work together:

Create Task

Fetch Tasks

How to run this demo

1. Clone and start the service with Docker-Compose

Open your terminal/console:

git clone https://github.com/viettranx/microservices-clean-architecture-demo
cd microservices-clean-architecture-demo

docker compose up --force-recreate --detach --build app

If everything is ok, the service will be running at on localhost:3000

Print all ENV variables:

docker compose exec app ./demo_app outenv

2. Make some requests

• Register new account

curl --location 'http://localhost:3000/v1/register' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "demo@demo.com",
    "password": "12345678",
    "last_name": "Microservices",
    "first_name": "Demo "
}'

{"data": true}

• Login

curl --location 'http://localhost:3000/v1/authenticate' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email": "demo@demo.com",
    "password": "12345678"
}'

The access token will return like this

{
  "data": {
    "access_token": {
      "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJlNTMycW9zOGpqTTIiLCJleHAiOjE2ODAyNTI0MDgsIm5iZiI6MTY3OTY0NzYwOCwiaWF0IjoxNjc5NjQ3NjA4LCJqdGkiOiI3OTEzYzhjYy05NmI0LTQ3ZmUtOWIzZi01MTUwZTk5NTM3MGUifQ.51d6zVuGtcAbw2poEWV4TffhEqJG8uxMOcGq7Mt8sZA",
      "expire_in": 604800
    }
  }
}

• Create a new task

  curl --location 'http://localhost:3000/v1/tasks' \
  --header 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJlNTMycW9zOGpqTTIiLCJleHAiOjE2ODAyNTI0MDgsIm5iZiI6MTY3OTY0NzYwOCwiaWF0IjoxNjc5NjQ3NjA4LCJqdGkiOiI3OTEzYzhjYy05NmI0LTQ3ZmUtOWIzZi01MTUwZTk5NTM3MGUifQ.51d6zVuGtcAbw2poEWV4TffhEqJG8uxMOcGq7Mt8sZA' \
  --header 'Content-Type: application/json' \
  --data '{
  "title": "This is a new task",
  "description": "Build a simple demo clean architecture"
  }'

New Task id will be returned

{"data":"e532sJ4XpCi8"}

• Fetch list tasks

  curl --location 'http://localhost:3000/v1/tasks' \
  --header 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJnR3pUQlVScWhhakciLCJleHAiOjE2ODAwNjQzNzcsIm5iZiI6MTY3OTQ1OTU3NywiaWF0IjoxNjc5NDU5NTc3LCJqdGkiOiI5Y2U4ZjUwMC1hYTczLTQ1MTYtYmJhYy04OTBiNDBjNDVkMDAifQ.VsqU8_Gn_EMwKAYW-En3BG58nWTREG6s3zCVXu7sZgQ'

  {
  "data": [
  {
    "id": "e532sJ4XpCi8",
    "created_at": "2023-03-24T08:50:07Z",
    "updated_at": "2023-03-24T08:50:07Z",
    "title": "This is a new task",
    "description": "Build a simple demo clean architecture",
    "status": "doing",
    "user": {
      "id": "e532qos8jjM2",
      "last_name": "Microservices",
      "first_name": "Demo",
      "avatar": null
    }
  }
  ],
  "paging": {
  "page": 1,
  "limit": 10,
  "total": 1,
  "cursor": "",
  "next_cursor": ""
  },
  "extra": {}
  }

Conclusion

Building services with Clean Architecture is difficult, especially in Microservices. I hope this repo help you. Enjoy it and feel free to create PRs or Issues.