use serde::{Serialize, Deserialize};use confy;const CONFIG_NAME: &str = "config";#[derive(Serialize, Deserialize, Default, Debug)]pub struct Config {pub http: HttpConfig,pub db: DbConfig}#[derive(Serialize, Deserialize, Default, Debug)]pub struct DbConfig {pub user: String,pub password: String,pub host: String,pub port: u16,pub database: String}#[derive(Serialize, Deserialize, Default, Debug)]pub struct HttpConfig {pub host: String,pub port: u16}pub fn retrieve () -> Config {println!("Retrieving config from {:?}.", confy::get_configuration_file_path("url_shortener", CONFIG_NAME).unwrap());let data: Config = confy::load("url_shortener", CONFIG_NAME).expect("Unable to read config.toml");println!("Config settings retrieved: {:?}", data);data}