Convert host to IP address in Rust

host_to_ip.rs

use anyhow::{anyhow as e, Result};

pub async fn host_to_ip(host: &str) -> Result<String> {
    match tokio::net::lookup_host(host).await {
        Ok(mut ips) => {
            if let Some(ip) = ips.next() {
                Ok(ip.to_string())
            } else {
                Err(e!("No IP address found for {}", host))
            }
        }
        Err(err) => Err(e!("Failed to lookup {}: {}", host, err)),
    }
}

#[cfg(test)]
mod tests {
    use pretty_assertions::assert_eq;

    use super::*;

    #[tokio::test]
    async fn test_host_to_ip() {
        let ip = host_to_ip("quake.se:28000").await.ok();
        assert_eq!(ip, Some("46.227.68.148:28000".to_string()));
    }
}