Add async version of parse_and_resolve_peer_addr

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "netapp"
-version = "0.5.0"
+version = "0.5.1"
 authors = ["Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license-file = "LICENSE"

src/util.rs

@@ -1,5 +1,4 @@
 use std::net::SocketAddr;
-use std::net::ToSocketAddrs;
 
 use log::info;
 use serde::Serialize;
@@ -71,6 +70,8 @@ pub fn parse_peer_addr(peer: &str) -> Option<(NodeID, SocketAddr)> {
 /// Parse and resolve a peer's address including public key, written in the format:
 /// `<public key hex>@<ip or hostname>:<port>`
 pub fn parse_and_resolve_peer_addr(peer: &str) -> Option<(NodeID, Vec<SocketAddr>)> {
+	use std::net::ToSocketAddrs;
+
 	let delim = peer.find('@')?;
 	let (key, host) = peer.split_at(delim);
 	let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
@@ -80,3 +81,18 @@ pub fn parse_and_resolve_peer_addr(peer: &str) -> Option<(NodeID, Vec<SocketAddr
 	}
 	Some((pubkey, hosts))
 }
+
+/// async version of parse_and_resolve_peer_addr
+pub async fn parse_and_resolve_peer_addr_async(peer: &str) -> Option<(NodeID, Vec<SocketAddr>)> {
+	let delim = peer.find('@')?;
+	let (key, host) = peer.split_at(delim);
+	let pubkey = NodeID::from_slice(&hex::decode(&key).ok()?)?;
+	let hosts = tokio::net::lookup_host(&host[1..])
+		.await
+		.ok()?
+		.collect::<Vec<_>>();
+	if hosts.is_empty() {
+		return None;
+	}
+	Some((pubkey, hosts))
+}