split code into modules

src/packets.rs

@@ -1,4 +1,4 @@
-use std::{fmt::Debug, net::SocketAddr};
+use std::fmt::Debug;
 
 use anyhow::bail;
 use bytemuck::{Pod, Zeroable};
@@ -6,7 +6,6 @@ use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
     net::tcp::{ReadHalf, WriteHalf},
 };
-use tracing::debug;
 
 pub const REJECT_OOP: &[u8; 6] = b"\x04\x04oop\x00";
 pub const REJECT_TIMEOUT: &[u8; 10] = b"\x04\x08timeout\x00";
@@ -177,65 +176,3 @@ impl Packet {
         })
     }
 }
-
-pub async fn dyn_ip_update(
-    server: &SocketAddr,
-    number: u32,
-    pin: u16,
-    port: u16,
-) -> anyhow::Result<std::net::Ipv4Addr> {
-    debug!(%number, %port, "starting dyn ip update");
-
-    let mut packet = Packet::default();
-    packet.header = Header {
-        kind: PacketKind::DynIpUpdate.raw(),
-        length: 8,
-    };
-
-    packet.data.clear();
-    packet.data.reserve(packet.header.length as usize);
-    packet.data.extend_from_slice(&number.to_le_bytes());
-    packet.data.extend_from_slice(&pin.to_le_bytes());
-    packet.data.extend_from_slice(&port.to_le_bytes());
-
-    let mut socket = tokio::net::TcpStream::connect(server).await?;
-
-    let (mut reader, mut writer) = socket.split();
-
-    packet.send(&mut writer).await?;
-
-    packet.recv_into(&mut reader).await?;
-
-    let result = match packet.kind() {
-        PacketKind::DynIpUpdateResponse => Ok(<[u8; 4]>::try_from(packet.data)
-            .map_err(|err| {
-                anyhow::anyhow!(
-                    "too little data for ip address. Need 4 bytes got {}",
-                    err.len()
-                )
-            })?
-            .into()),
-        PacketKind::Error => {
-            let first_zero = packet
-                .data
-                .iter()
-                .enumerate()
-                .find_map(|(i, x)| (*x == 0).then_some(i));
-
-            bail!(
-                "{}",
-                std::str::from_utf8(
-                    first_zero
-                        .map(|i| &packet.data[..i])
-                        .unwrap_or(&packet.data),
-                )?
-            )
-        }
-
-        _ => bail!("server returned unexpected packet"),
-    };
-
-    debug!(?result, "finished dyn ip update");
-
-    result
-}