Krys4lide/crates/backend/src/lib.rs

use anyhow::Error as AnyError;
use axum::http::{StatusCode, Uri};
use axum::response::{IntoResponse, Response};
use axum::{routing::get, Router};

pub fn get_router() -> Router {
    Router::new()
        .route("/", get(|| async { "Hello, world!" }))
        .fallback(fallback)
}

async fn fallback(uri: Uri) -> (StatusCode, String) {
    (StatusCode::NOT_FOUND, format!("No route for {uri}"))
}

struct AppError(AnyError);

// To automatically convert `AppError` into a response
impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        (
            StatusCode::INTERNAL_SERVER_ERROR,
            format!("Internal Server Error: {}", self.0),
        )
            .into_response()
    }
}

// To automatically convert `AnyError` into `AppError`
impl<E> From<E> for AppError
where
    E: Into<AnyError>,
{
    fn from(err: E) -> Self {
        Self(err.into())
    }
}