nemicosm/src/main.rs

use std::str::FromStr;

use anyhow::{bail, Result};
use trust_dns_resolver::{
    config::{ResolverConfig, ResolverOpts},
    Resolver,
};

fn main() -> Result<()> {
    let (port, host) = resolve_dns("daeken.dev")?;

    dbg!(port);
    dbg!(host);

    Ok(())
}

// TODO: How to cache this?
fn resolve_dns(server: &str) -> Result<(u16, String)> {
    let name = format!("_hypercosm._tls.{}", server);

    let resp = make_dns_client()?
        .srv_lookup(name)?
        .into_iter()
        .collect::<Vec<_>>();

    // TODO: Ensure exactly 1 result: I think.
    let srv = &resp[0];

    // TODO: Handle priority and weight.
    let port = srv.port();
    // TODO: Should this be ascii or utf8
    let name = srv.target().to_ascii();

    Ok((port, name))
}

fn make_dns_client() -> Result<Resolver> {
    Ok(Resolver::new(
        ResolverConfig::cloudflare_tls(),
        ResolverOpts::default(),
    )?)
}