Axum and Clean Architecture

An example of web application by using Rust and Axum with Clean Architecture (Explicit Architecture).

Getting Started

Setting up database

Run Postgresql on Docker

docker-compose up --build -d

or

docker-compose build --no-cache
docker-compose up -d

• --no-cache: Do not use cache when building the image.
• -d: Detached mode: Run containers in the background, print new container names.

Create database and migration in the app container

docker-compose exec app bash

and

sqlx database create
sqlx migrate run

Drop database

sqlx database drop

Run the web application

Execute a command in the running app container and cargo run in the app container.

docker-compose exec app bash

cargo run

Run the web application (in local)

Create .env and cargo run.

cp local.env .env

cargo run

Notes

docker-compose

Start, Stop, Restart

docker-compose start

docker-compose stop

docker-compose restart

Down

docker-compose down -v

• -v: Remove named volumes declared in the volumes section of the Compose file and anonymous volumes attached to containers.

Exec

Execute a command in a running container.

docker-compose exec app bash
docker-compose exec db bash

Development

Dependencies

• Axum 0.7.5
• Postgresql 16

Architecture

This example project has 4 workspaces:

• todo-driver (driver or controller)
• todo-app (app or usecase)
• todo-kernel (kernel or domain)
• todo-adapter (adapter or infrastructure)

The upper side in this list is to be an upper layer, the lower ones are to be a lower layer. The upper layers can call or use the lower ones but the opposite calling isn't allowed. For instance, the driver layer can call the app layer's modules but the app layer cannot call the driver layer's modules.

DIP (Dependency Inversion Principle) is applied between kernel and adapter layer. For example, the kernel layer's repositories have just definitions of traits, these implementations are in the adapter layer.

The driver layer has only around Axum's definition. Axum's Router, handler and launching the server. Things around definitions and settings for web applications have to be defined within this layer.

The app layer has a so-called "use case" layer (in the context of clean architecture). The layer controls the entire application process and logic has to be defined in the range of this layer.

The kernel layer has a so-called "domain" layer (in the context of clean architecture as well). This layer is the core context of the application. For instance, calculators for stock stats have to be described within this layer.

The adapter layer has around infrastructure's concerns. This layer can connect and access outside middlewares, services or APIs. The access and connection processes have to be bounded in this layer.

See more:

• explicit architecture – @hgraca

References

• Rust の新しい HTTP サーバーのクレート Axum をフルに活用してサーバーサイドアプリケーション開発をしてみる - Don't Repeat Yourself

License

This project is licensed under the MIT license.