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use errors::*;
use std::net::{IpAddr, SocketAddr};
use make_discovery_key;
use data_encoding::HEXLOWER;
use resolve::{self, DnsConfig, DnsResolver, resolve_host};
use resolve::record::Srv;
pub fn discover_peers_dns(dat_key: &[u8]) -> Result<Vec<SocketAddr>> {
let dk = make_discovery_key(dat_key);
let dk_hex = HEXLOWER.encode(&dk);
let dk_name = format!("{}.dat.local", &dk_hex[0..40]);
info!("discovering peers using DNS: {}", dk_name);
let dns1: Vec<IpAddr> = resolve_host("discovery1.publicbits.org")?.collect();
let dns2: Vec<IpAddr> = resolve_host("discovery2.publicbits.org")?.collect();
let default_config = resolve::default_config()?;
let config = DnsConfig {
name_servers: vec![
SocketAddr::from((dns1[0], 53)),
SocketAddr::from((dns2[0], 53))],
search: vec!["dat.local".to_string()],
n_dots: default_config.n_dots,
timeout: default_config.timeout,
attempts: default_config.attempts,
rotate: true,
use_inet6: false,
};
let resolver = DnsResolver::new(config)?;
let peers: Vec<Srv> = resolver.resolve_record(&dk_name)?;
// target (IP addresses) are returned with a trailing period that must be stripped
let peers: Vec<SocketAddr> = peers.into_iter().map(|r| format!("{}:{}", &r.target[0..(r.target.len()-1)], r.port).parse().unwrap()).collect();
info!("found peers: {:?}", peers);
Ok(peers)
}
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