feat: use cursors instead of byte arrays

src/main.rs

@@ -1,9 +1,10 @@
 mod config;
 mod dns;
+mod ext;
 mod logging;
 mod macros;
 
-use std::net::SocketAddr;
+use std::{io::Cursor, net::SocketAddr};
 
 use anyhow::Result;
 use dotenv::dotenv;
@@ -24,7 +25,8 @@ async fn main() -> Result<()> {
 
     loop {
         let (size, addr) = sock.recv_from(&mut buffer).await?;
-        let result = handle_datagram(&config, &sock, &addr, &buffer[..size]).await;
+        let mut cursor = Cursor::new(&buffer[..size]);
+        let result = handle_datagram(&config, &sock, &addr, &mut cursor).await;
         if let Err(err) = result {
             tracing::error!("failed to handle datagram: {err}");
         }
@@ -35,9 +37,9 @@ async fn handle_datagram(
     config: &config::ConfigData,
     sock: &UdpSocket,
     addr: &SocketAddr,
-    datagram: &[u8],
+    cursor: &mut Cursor<&[u8]>,
 ) -> Result<()> {
-    let message = Message::parse(datagram)?;
+    let message = Message::parse(cursor)?;
     let span = tracing::span!(
         Level::INFO,
         "handle_datagram",