const DEFAULT_TIMEOUT: Duration = Duration::from_secs(5);

    pub async fn call(&mut self, message: G::CallMsg) -> Result<G::OutMsg, GenServerError> {
        self.call_with_timeout(message, Self::DEFAULT_TIMEOUT).await
    }

    pub async fn call_with_timeout(
        &mut self,
        message: G::CallMsg,
        duration: Duration,
    ) -> Result<G::OutMsg, GenServerError> {
        let (oneshot_tx, oneshot_rx) = oneshot::channel::<Result<G::OutMsg, GenServerError>>();
        self.tx.send(GenServerInMsg::Call {
            sender: oneshot_tx,
            message,
        })?;

        match timeout(duration, oneshot_rx).await {
            Ok(Ok(result)) => result,
            Ok(Err(_)) => Err(GenServerError::Server),
            Err(_) => Err(GenServerError::CallTimeout),
        }
    }