feat: allow DNS names in peers/seeds list and resolve them (#3125)

* feat: allow DNS names in peers/seeds list and resolve them

* tests: add mod for peer tests

* refactor: rename some variables

* chore: use Serde desrialize to resolve DNS names into PeerAddrs

* fix: compile

* fix: add back code to remove duplicate ip addresses from resolved DNS seeds

src/bin/cmd/server.rs

@@ -24,9 +24,11 @@ use ctrlc;
 
 use crate::config::GlobalConfig;
 use crate::core::global;
-use crate::p2p::{PeerAddr, Seeding};
+use crate::p2p::Seeding;
 use crate::servers;
 use crate::tui::ui;
+use grin_p2p::msg::PeerAddrs;
+use grin_p2p::PeerAddr;
 use grin_util::logger::LogEntry;
 use std::sync::mpsc;
 
@@ -119,12 +121,12 @@ pub fn server_command(
 		}
 
 		if let Some(seeds) = a.values_of("seed") {
-			let seed_addrs = seeds
-				.filter_map(|x| x.parse().ok())
-				.map(|x| PeerAddr(x))
+			let peers = seeds
+				.filter_map(|s| s.parse().ok())
+				.map(|sa| PeerAddr(sa))
 				.collect();
 			server_config.p2p_config.seeding_type = Seeding::List;
-			server_config.p2p_config.seeds = Some(seed_addrs);
+			server_config.p2p_config.seeds = Some(PeerAddrs { peers });
 		}
 	}