go train delay rust api srv init

go_train_delay_rust_api_srv_init.rs

#[allow(dead_code)]
pub struct Application {
    port: u16,
    server: Server,
}

impl Application {
    pub async fn new() -> Result<Self, AppError> {
        dotenv().ok();
        
        let app_state = AppState::new().await?;

        let srv = app_state.get_srv().await?;

        Ok(Application {
            port: 8080,
            server: srv,
        })
    }

    #[allow(dead_code)]
    pub fn port(&self) -> u16 {
        self.port
    }

    pub async fn run_until_stopped(self) -> Result<(), AppError> {
        self.server.await?;
        Ok(())
    }

    #[allow(dead_code)]
    pub async fn graceful_shutdown(self) -> Result<(), AppError> {
        self.server.stop(true).await;
        Ok(())
    }
}