rust
Use when building Axum applications, implementing type-safe handlers, working with SQLx, setting up error handling with thiserror, or writing Rust backend services.
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SKILL.md
소스 지침 · 읽기 전용 미리보기- name
- rust
- version
- 1.0.0
- description
- Use when building Axum applications, implementing type-safe handlers, working with SQLx, setting up error handling with thiserror, or writing Rust backend services.
- keywords
- ["Rust","Axum","SQLx","tokio","async","type safety","backend","thiserror"]
- plugin
- dev
- updated
- 2026-01-20T00:00:00.000Z
# Rust Backend Patterns
## Overview
Rust patterns for building backend services with Axum.
## Project Structure
```
project/
├── src/
│ ├── main.rs # Entry point
│ ├── lib.rs # Library root
│ ├── config.rs # Configuration
│ ├── error.rs # Error types
│ ├── routes/ # Route handlers
│ │ ├── mod.rs
│ │ └── users.rs
│ ├── services/ # Business logic
│ ├── repositories/ # Data access
│ ├── models/ # Domain models
│ └── middleware/ # HTTP middleware
├── migrations/ # SQLx migrations
├── tests/ # Integration tests
├── Cargo.toml
└── .env
```
## Axum Application
### Main Application
```rust
// src/main.rs
use axum::{
routing::{get, post},
Router,
};
use sqlx::postgres::PgPoolOptions;
use std::sync::Arc;
use tower_http::cors::CorsLayer;
mod config;
mod error;
mod routes;
mod services;
mod repositories;
use config::Config;
#[derive(Clone)]
pub struct AppState {
pub db: sqlx::PgPool,
pub config: Arc<Config>,
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
dotenvy::dotenv().ok();
tracing_subscriber::init();
let config = Config::from_env()?;
let pool = PgPoolOptions::new()
.max_connections(config.database.max_connections)
.connect(&config.database.url)
.await?;
sqlx::migrate!().run(&pool).await?;
let state = AppState {
db: pool,
config: Arc::new(config),
};
let app = Router::new()
.route("/health", get(|| async { "ok" }))
.nest("/api/users", routes::users::router())
.with_state(state)
.layer(CorsLayer::permissive());
let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await?;
tracing::info!("listening on {}", listener.local_addr()?);
axum::serve(listener, app).await?;
Ok(())
}
```
### Configuration
```rust
// src/config.rs
use serde::Deserialize;
#[derive(Debug, Deserialize)]
pub struct Config {
pub database: DatabaseConfig,
pub jwt: JwtConfig,
}
#[derive(Debug, Deserialize)]
pub struct DatabaseConfig {
pub url: String,
#[serde(default = "default_max_connections")]
pub max_connections: u32,
}
#[derive(Debug, Deserialize)]
pub struct JwtConfig {
pub secret: String,
#[serde(default = "default_expiry")]
pub expiry_hours: u64,
}
fn default_max_connections() -> u32 { 10 }
fn default_expiry() -> u64 { 24 }
impl Config {
pub fn from_env() -> Result<Self, config::ConfigError> {
config::Config::builder()
.add_source(config::Environment::default().separator("__"))
.build()?
.try_deserialize()
}
}
```
## Error Handling
```rust
// src/error.rs
use axum::{
http::StatusCode,
response::{IntoResponse, Response},
Json,
};
use serde_json::json;
use thiserror::Error;
#[derive(Error, Debug)]
pub enum AppError {
#[error("Not found: {0}")]
NotFound(String),
#[error("Validation error: {0}")]
Validation(String),
#[error("Unauthorized")]
Unauthorized,
#[error("Forbidden")]
Forbidden,
#[error("Database error")]
Database(#[from] sqlx::Error),
#[error("Internal error")]
Internal(#[from] anyhow::Error),
}
impl IntoResponse for AppError {
fn into_response(self) -> Response {
let (status, code, message) = match &self {
AppError::NotFound(msg) => (StatusCode::NOT_FOUND, "NOT_FOUND", msg.clone()),
AppError::Validation(msg) => (StatusCode::BAD_REQUEST, "VALIDATION_ERROR", msg.clone()),
AppError::Unauthorized => (StatusCode::UNAUTHORIZED, "UNAUTHORIZED", "Unauthorized".into()),
AppError::Forbidden => (StatusCode::FORBIDDEN, "FORBIDDEN", "Forbidden".into()),
AppError::Database(e) => {
tracing::error!("Database error: {:?}", e);
(StatusCode::INTERNAL_SERVER_ERROR, "DATABASE_ERROR", "Database error".into())
}
AppError::Internal(e) => {
tracing::error!("Internal error: {:?}", e);
(StatusCode::INTERNAL_SERVER_ERROR, "INTERNAL_ERROR", "Internal error".into())
}
};
(
status,
Json(json!({
"error": {
"code": code,
"message": message
}
})),
).into_response()
}
}
pub type Result<T> = std::result::Result<T, AppError>;
```
## Models and DTOs
```rust
// src/models/user.rs
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use sqlx::FromRow;
use uuid::Uuid;
use validator::Validate;
#[derive(Debug, FromRow, Serialize)]
pub struct User {
pub id: Uuid,
pub name: String,
pub email: String,
#[serde(skip_serializing)]
pub password_hash: String,
pub created_at: DateTime<Utc>,
pub updated_at: Option<DateTime<Utc>>,
}
#[derive(Debug, Deserialize, Validate)]
pub struct CreateUser {
#[validate(length(min = 2, max = 100))]
pub name: String,
#[validate(email)]
pub email: String,
#[validate(length(min = 8))]
pub password: String,
}
#[derive(Debug, Deserialize, Validate)]
pub struct UpdateUser {
#[validate(length(min = 2, max = 100))]
pub name: Option<String>,
#[validate(email)]
pub email: Option<String>,
}
#[derive(Debug, Serialize)]
pub struct UserResponse {
pub id: Uuid,
pub name: String,
pub email: String,
pub created_at: DateTime<Utc>,
}
impl From<User> for UserResponse {
fn from(user: User) -> Self {
Self {
id: user.id,
name: user.name,
email: user.email,
created_at: user.created_at,
}
}
}
```
## Repository Pattern
```rust
// src/repositories/user.rs
use sqlx::PgPool;
use uuid::Uuid;
use crate::error::{AppError, Result};
use crate::models::user::{User, CreateUser, UpdateUser};
pub struct UserRepository<'a> {
pool: &'a PgPool,
}
impl<'a> UserRepository<'a> {
pub fn new(pool: &'a PgPool) -> Self {
Self { pool }
}
pub async fn find_by_id(&self, id: Uuid) -> Result<Option<User>> {
sqlx::query_as!(User, "SELECT * FROM users WHERE id = $1", id)
.fetch_optional(self.pool)
.await
.map_err(AppError::Database)
}
pub async fn find_by_email(&self, email: &str) -> Result<Option<User>> {
sqlx::query_as!(User, "SELECT * FROM users WHERE email = $1", email)
.fetch_optional(self.pool)
.await
.map_err(AppError::Database)
}
pub async fn find_all(&self, limit: i64, offset: i64) -> Result<Vec<User>> {
sqlx::query_as!(
User,
"SELECT * FROM users ORDER BY created_at DESC LIMIT $1 OFFSET $2",
limit,
offset
)
.fetch_all(self.pool)
.await
.map_err(AppError::Database)
}
pub async fn create(&self, input: &CreateUser, password_hash: &str) -> Result<User> {
sqlx::query_as!(
User,
r#"
INSERT INTO users (name, email, password_hash)
VALUES ($1, $2, $3)
RETURNING *
"#,
input.name,
input.email,
password_hash
)
.fetch_one(self.pool)
.await
.map_err(AppError::Database)
}
pub async fn update(&self, id: Uuid, input: &UpdateUser) -> Result<Option<User>> {
sqlx::query_as!(
User,
r#"
UPDATE users
SET name = COALESCE($2, name),
email = COALESCE($3, email),
updated_at = NOW()
WHERE id = $1
RETURNING *
"#,
id,
input.name,
input.email
)
.fetch_optional(self.pool)
.await
.map_err(AppError::Database)
}
pub async fn delete(&self, id: Uuid) -> Result<bool> {
let result = sqlx::query!("DELETE FROM users WHERE id = $1", id)
.execute(self.pool)
.await
.map_err(AppError::Database)?;
Ok(result.rows_affected() > 0)
}
}
```
## Route Handlers
```rust
// src/routes/users.rs
use axum::{
extract::{Path, Query, State},
routing::{get, post, delete},
Json, Router,
};
use uuid::Uuid;
use validator::Validate;
use crate::{
error::{AppError, Result},
models::user::{CreateUser, UpdateUser, UserResponse},
repositories::user::UserRepository,
services::user::UserService,
AppState,
};
#[derive(Debug, serde::Deserialize)]
pub struct ListQuery {
#[serde(default = "default_page")]
page: i64,
#[serde(default = "default_limit")]
limit: i64,
}
fn default_page() -> i64 { 1 }
fn default_limit() -> i64 { 20 }
pub fn router() -> Router<AppState> {
Router::new()
.route("/", get(list_users).post(create_user))
.route("/:id", get(get_user).patch(update_user).delete(delete_user))
}
async fn list_users(
State(state): State<AppState>,
Query(query): Query<ListQuery>,
) -> Result<Json<Vec<UserResponse>>> {
let repo = UserRepository::new(&state.db);
let offset = (query.page - 1) * query.limit;
let users = repo.find_all(query.limit, offset).await?;
Ok(Json(users.into_iter().map(Into::into).collect()))
}
async fn get_user(
State(state): State<AppState>,
Path(id): Path<Uuid>,
) -> Result<Json<UserResponse>> {
let repo = UserRepository::new(&state.db);
let user = repo
.find_by_id(id)
.await?
.ok_or_else(|| AppError::NotFound("User".into()))?;
Ok(Json(user.into()))
}
async fn create_user(
State(state): State<AppState>,
Json(input): Json<CreateUser>,
) -> Result<Json<UserResponse>> {
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