You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/rust-in-databend/09-基于Rust Axum-web 和 MySQL 开发短链服务/api-service-demo/src
    
    the code of the file until where you have to start completion: use std::error::Error;
use std::net::SocketAddr;

mod config;
mod app;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let addr = SocketAddr::from(([0, 0, 0, 0], 3000)
    
async fn main() -> Result<(), Box<dyn Error>> {
    let addr = SocketAddr::from(([0, 0, 0, 0], 3000));
    let pool = config::database::do_connect().await;

    axum::Server::bind(&addr)
        .serve(config::routes::app(pool).into_make_service())
        .await?;
    Ok(())
}