axum-diesel-real-world

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axum-diesel-real-world

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The goal of this repository is to have a real world template of a Rust backend using Axum, Diesel, etc.

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# Axum Diesel Real-World Example

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A modular Rust backend template designed with a Domain-Driven Design (DDD) approach, powered by the Axum web framework and Diesel ORM. This repository aims to provide a robust starting point for building scalable and maintainable real-world applications in Rust.

## Table of Contents

- [Introduction](#introduction)
- [Features](#features)
- [Prerequisites](#prerequisites)
- [Getting Started](#getting-started)
- [Project Structure](#project-structure)
- [Configuration](#configuration)
- [Database Migrations](#database-migrations)
- [Running the Application](#running-the-application)
- [Contributing](#contributing)
- [License](#license)

## Introduction

This repository offers a boilerplate for developing Rust backend applications, emphasizing clean architecture through Domain-Driven Design. It leverages the asynchronous capabilities of [Axum](https://github.com/tokio-rs/axum) for building high-performance web APIs and [Diesel](https://github.com/diesel-rs/diesel) for efficient database interaction, primarily with PostgreSQL.

## Features

-   **Domain-Driven Design (DDD)**: Clear separation of concerns with domain, application, and infrastructure layers.
-   **Asynchronous API**: Built with Axum, leveraging the Tokio runtime.
-   **Database ORM**: Uses Diesel for database operations and migrations.
-   **Connection Pooling**: Integrates `deadpool-diesel` for managing database connections.
-   **Configuration Management**: Centralized configuration loading.
-   **Error Handling**: Structured application-wide error management.
-   **Modular Structure**: Designed for easy extension and maintainability.
-   **Logging**: Integrated `tracing` for structured logging.
-   *(Optional: Authentication modules with OAuth, etc. - can be added as features are developed)*

## Prerequisites

Before you begin, ensure you have the following installed:
-   [Rust (latest stable version recommended)](https://www.rust-lang.org/tools/install)
-   [Diesel CLI](https://diesel.rs/guides/getting-started) (for your specific database, e.g., PostgreSQL):
    ```bash
    cargo install diesel_cli --no-default-features --features postgres
    ```
-   A running PostgreSQL instance (or your database of choice, with adjustments).

## Getting Started

1.  **Clone the repository:**
    ```bash
    git clone https://github.com/Quentin-Piot/axum-diesel-real-world.git
    cd axum-diesel-real-world
    ```

2.  **Set up your environment:**
    Create a `.env` file in the root of the project by copying the example:
    ```bash
    cp .env.example .env
    ```
    Edit `.env` and set your `DATABASE_URL` and other configurations as needed. For example:
    ```env
    DATABASE_URL=postgres://user:password@localhost/your_db_name
    SERVER_HOST=127.0.0.1
    SERVER_PORT=8000
    RUST_LOG=axum_diesel_real_world=debug,tower_http=debug
    ```

3.  **Setup the database and run migrations:**
    Ensure your PostgreSQL server is running and the database specified in `DATABASE_URL` exists.
    ```bash
    diesel setup
    diesel migration run
    ```
    This will create the necessary tables defined in the `migrations/` directory.

4.  **Build the project:**
    ```bash
    cargo build
    ```

## Project Structure

The project follows a DDD-inspired modular structure:

-   `src/`: Main application source code.
    -   `config.rs`: Application configuration loading (e.g., using `once_cell`).
    -   `domain/`: Core business logic and domain entities.
        -   `models.rs`: Domain model structs (distinct from database persistence models if needed).
        -   `services/`: Domain services.
    -   `errors.rs`: Custom application-wide error types and conversions.
    -   `handlers/`: Axum request handlers (controllers in MVC terms).
    -   `infra/`: Infrastructure concerns like database access, external API clients.
        -   `db.rs`: Database connection setup, connection pool.
        -   `repositories.rs`: Implementations of repository patterns for data access.
    -   `models.rs`: (Could be here or in `infra/`) Persistence-layer structs, often generated or used by Diesel.
    -   `routes.rs`: API route definitions.
    -   `schema.rs`: Auto-generated by Diesel, representing the database schema.
    -   `state.rs`: Defines `AppState` shared across handlers.
    -   `utils/`: Utility functions, custom extractors, etc.
    -   `main.rs`: Application entry point, server setup.
-   `migrations/`: Diesel database migration files.
-   `.env.example`: Example environment file.
-   `Cargo.toml`: Project dependencies and metadata.

## Configuration

Application configuration is managed via environment variables, typically loaded from a `.env` file using a crate like `dotenvy`. The `src/config.rs` module handles loading and providing access to these configurations.

## Database Migrations

Diesel is used for managing database schema changes.
-   To create a new migration:
    ```bash
    diesel migration generate your_migration_name
    ```
-   To run pending migrations:
    ```bash
    diesel migration run
    ```
-   To revert the last migration:
    ```bash
    diesel migration redo
    ```
The application also runs pending migrations automatically on startup.

## Running the Application

-   **Development Mode:**
    ```bash
    cargo run
    ```
    The server will typically start on `http://127.0.0.1:3000` (or as configured).

-   **Release Mode:**
    ```bash
    cargo build --release
    ./target/release/axum-diesel-real-world
    ```

## Contributing

Contributions are welcome! Please feel free to open an issue or submit a pull request.
1. Fork the Project
2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
3. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
4. Push to the Branch (`git push origin feature/AmazingFeature`)
5. Open a Pull Request

## License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

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