An example of how logging macros might work

logging-application.rs

async fn handle_graphql(
    ctx: AppData<Context>,
    query: body::Json<juniper::http::GraphQLRequest>,
) -> Response {
    let response = query.execute(&Schema::new(Query, Mutation), &ctx);
    debug!("Query: {:?} response: {}", query, response);
    let status = if response.is_ok() {
        StatusCode::OK
    } else {
        StatusCode::BAD_REQUEST
    };
    body::Json(response).with_status(status).into_response()
}

logging-lib.rs

    /// Start serving the app at the given address.
    ///
    /// Blocks the calling thread indefinitely.
    pub fn serve(self) {
        let configuration = self.get_item::<Configuration>().unwrap();
        let addr = format!("{}:{}", configuration.address, configuration.port)
            .parse::<std::net::SocketAddr>()
            .unwrap();

        info!("Server is listening on: http://{}", addr);

        crate::serve::serve(self.into_server(), addr);
    }