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use async_trait::async_trait;
use num_enum::TryFromPrimitive;
use std::{borrow::Cow, fmt::Debug, io};
pub const PROTO_ID: u32 = 0x4f457403;
pub const UDP_PKT_SIZE: usize = 512;
pub const NUM_CHANS: usize = 3;
pub const REL_BUFFER: usize = 0x8000;
pub const INIT_SEQNUM: u16 = 65500;
pub const TIMEOUT: u64 = 30;
pub const PING_TIMEOUT: u64 = 5;
#[async_trait]
pub trait UdpSender: Send + Sync {
async fn send(&self, data: &[u8]) -> io::Result<()>;
}
#[async_trait]
pub trait UdpReceiver: Send {
async fn recv(&mut self) -> io::Result<Vec<u8>>;
}
#[derive(Debug, Copy, Clone, PartialEq)]
#[repr(u16)]
pub enum PeerID {
Nil = 0,
Srv,
CltMin,
}
#[derive(Debug, Copy, Clone, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum PktType {
Ctl = 0,
Orig,
Split,
Rel,
}
#[derive(Debug, Copy, Clone, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum CtlType {
Ack = 0,
SetPeerID,
Ping,
Disco,
}
#[derive(Debug)]
pub struct Pkt<'a> {
pub unrel: bool,
pub chan: u8,
pub data: Cow<'a, [u8]>,
}
impl<'a> Pkt<'a> {
pub fn size(&self) -> usize {
self.header_size() + self.body_size()
}
pub fn body_size(&self) -> usize {
self.data.len()
}
pub fn header_size(&self) -> usize {
4 + 2 + 1 + if self.unrel { 0 } else { 1 + 2 } + 1
}
}
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