src/server/error/mod.rs


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

#[derive(Debug)]
pub struct AppError(anyhow::Error);

// Tell axum how to convert `AppError` into a response.
impl IntoResponse for AppError {
    fn into_response(self) -> Response {
        tracing::error!("Application error: {:#}", self.0);

        (StatusCode::INTERNAL_SERVER_ERROR, "Something went wrong").into_response()
    }
}

// This enables using `?` on functions that return `Result<_, anyhow::Error>` to turn them into
// `Result<_, AppError>`. That way you don't need to do that manually.
impl<E> From<E> for AppError
where
    E: Into<anyhow::Error>,
{
    fn from(err: E) -> Self {
        Self(err.into())
    }
}