Add support for host names in config address fields, resolve them to IP

src/config.rs

@@ -9,6 +9,7 @@ use version_compare::Cmp;
 
 use crate::proto;
 use crate::util::error::{quit_error, quit_error_msg, ErrorHintsBuilder};
+use crate::util::serde::to_socket_addrs;
 
 /// Default configuration file location.
 pub const CONFIG_FILE: &str = "lazymc.toml";
@@ -127,6 +128,7 @@ impl Config {
 #[serde(default)]
 pub struct Public {
     /// Public address.
+    #[serde(deserialize_with = "to_socket_addrs")]
     pub address: SocketAddr,
 
     /// Minecraft protocol version name hint.
@@ -157,7 +159,10 @@ pub struct Server {
     pub command: String,
 
     /// Server address.
-    #[serde(default = "server_address_default")]
+    #[serde(
+        deserialize_with = "to_socket_addrs",
+        default = "server_address_default"
+    )]
     pub address: SocketAddr,
 
     /// Immediately wake server when starting lazymc.
@@ -318,6 +323,7 @@ impl Default for JoinHold {
 #[serde(default)]
 pub struct JoinForward {
     /// IP and port to forward to.
+    #[serde(deserialize_with = "to_socket_addrs")]
     pub address: SocketAddr,
 }
 

src/util/mod.rs

@@ -1,5 +1,6 @@
 pub mod cli;
 pub mod error;
+pub mod serde;
 pub mod style;
 
 use std::env;

src/util/serde.rs

@@ -0,0 +1,30 @@
+use std::net::{SocketAddr, ToSocketAddrs};
+
+use serde::de::{Error, Unexpected};
+use serde::{Deserialize, Deserializer};
+
+/// Deserialize a `Vec` into a `HashMap` by key.
+pub fn to_socket_addrs<'de, D>(d: D) -> Result<SocketAddr, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    // Deserialize string
+    let addr = String::deserialize(d)?;
+
+    // Try to socket address to resolve
+    match addr.to_socket_addrs() {
+        Ok(mut addr) => {
+            if let Some(addr) = addr.next() {
+                return Ok(addr);
+            }
+        }
+        Err(err) => {
+            dbg!(err);
+        }
+    }
+
+    // Parse raw IP address
+    addr.parse().map_err(|_| {
+        Error::invalid_value(Unexpected::Str(&addr), &"IP or resolvable host and port")
+    })
+}