deadpool postgres simple setup

deadpool_postgres.rs

use deadpool_postgres::tokio_postgres::NoTls;
use deadpool_postgres::{Config, ManagerConfig, Pool, PoolError, RecyclingMethod};
use once_cell::sync::Lazy;
use std::sync::Arc;

static DB_POOL: Lazy<Arc<Pool>> = Lazy::new(|| {
    let mut cfg = Config::new();
    cfg.dbname = Some(
        std::env::var("DATABASE_URL")
            .map_err(|_| String::from("Environment variable Database URL could not be read"))
            .unwrap(),
    );
    cfg.manager = Some(ManagerConfig {
        recycling_method: RecyclingMethod::Fast,
    });
    let pool = cfg.create_pool(NoTls).unwrap();

    Arc::new(pool)
});

type ManagedObject = deadpool::managed::Object<
    deadpool_postgres::ClientWrapper,
    deadpool_postgres::tokio_postgres::error::Error,
>;

pub async fn db_conn() -> Result<ManagedObject, PoolError> {
    DB_POOL.get().await
}