src/error.rs


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use axum::{
    http::StatusCode,
    response::{IntoResponse, Response},
};

pub enum AppError {
    BadRequest,
    Conflict,
    Database(sqlx::Error),
    NotFound,
}

impl From<sqlx::Error> for AppError {
    fn from(e: sqlx::Error) -> Self {
        match e {
            sqlx::Error::Database(e) if e.is_unique_violation() => AppError::Conflict,
            sqlx::Error::RowNotFound => AppError::NotFound,
            e => AppError::Database(e),
        }
    }
}

impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        match self {
            AppError::BadRequest => StatusCode::BAD_REQUEST,
            AppError::Conflict => StatusCode::CONFLICT,
            AppError::Database(e) => {
                tracing::error!("database error: {e}");
                StatusCode::INTERNAL_SERVER_ERROR
            }
            AppError::NotFound => StatusCode::NOT_FOUND,
        }
        .into_response()
    }
}