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#![feature(cursor_remaining)]
#![feature(hash_drain_filter)]
#![feature(once_cell)]
mod client;
pub mod error;
mod new;
mod recv;
mod send;
use async_trait::async_trait;
use byteorder::{BigEndian, WriteBytesExt};
pub use client::{connect, Sender as Client};
pub use new::new;
use num_enum::TryFromPrimitive;
use pretty_hex::PrettyHex;
use std::{
collections::HashMap,
io::{self, Write},
ops,
sync::Arc,
time::Duration,
};
use tokio::{
sync::{mpsc, watch, Mutex, RwLock},
task::JoinSet,
};
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;
mod ticker_mod {
#[macro_export]
macro_rules! ticker {
($duration:expr, $close:expr, $body:block) => {
let mut interval = tokio::time::interval($duration);
while tokio::select!{
_ = interval.tick() => true,
_ = $close.changed() => false,
} $body
};
}
//pub(crate) use ticker;
}
#[async_trait]
pub trait UdpSender: Send + Sync + 'static {
async fn send(&self, data: &[u8]) -> io::Result<()>;
}
#[async_trait]
pub trait UdpReceiver: Send + Sync + 'static {
async fn recv(&self) -> io::Result<Vec<u8>>;
}
#[derive(Debug, Copy, Clone, PartialEq)]
#[repr(u16)]
pub enum PeerID {
Nil = 0,
Srv,
CltMin,
}
#[derive(Debug, Copy, Clone, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum PktType {
Ctl = 0,
Orig,
Split,
Rel,
}
#[derive(Debug, Copy, Clone, PartialEq, TryFromPrimitive)]
#[repr(u8)]
pub enum CtlType {
Ack = 0,
SetPeerID,
Ping,
Disco,
}
#[derive(Debug)]
pub struct Pkt<T> {
unrel: bool,
chan: u8,
data: T,
}
pub type Error = error::Error;
pub type InPkt = Result<Pkt<Vec<u8>>, Error>;
#[derive(Debug)]
struct Ack {
tx: watch::Sender<bool>,
rx: watch::Receiver<bool>,
data: Vec<u8>,
}
#[derive(Debug)]
struct Chan {
acks: HashMap<u16, Ack>,
seqnum: u16,
}
#[derive(Debug)]
pub struct RudpShare<S: UdpSender> {
id: u16,
remote_id: RwLock<u16>,
chans: Vec<Mutex<Chan>>,
udp_tx: S,
close_tx: watch::Sender<bool>,
tasks: Mutex<JoinSet<()>>,
}
#[derive(Debug)]
pub struct RudpReceiver<S: UdpSender> {
share: Arc<RudpShare<S>>,
pkt_rx: mpsc::UnboundedReceiver<InPkt>,
}
#[derive(Debug)]
pub struct RudpSender<S: UdpSender> {
share: Arc<RudpShare<S>>,
}
macro_rules! impl_share {
($T:ident) => {
impl<S: UdpSender> $T<S> {
pub async fn peer_id(&self) -> u16 {
self.share.id
}
pub async fn is_server(&self) -> bool {
self.share.id == PeerID::Srv as u16
}
pub async fn close(self) {
self.share.close_tx.send(true).ok();
let mut tasks = self.share.tasks.lock().await;
while let Some(res) = tasks.join_next().await {
res.ok(); // TODO: handle error (?)
}
}
}
};
}
impl_share!(RudpReceiver);
impl_share!(RudpSender);
impl<S: UdpSender> ops::Deref for RudpReceiver<S> {
type Target = mpsc::UnboundedReceiver<InPkt>;
fn deref(&self) -> &Self::Target {
&self.pkt_rx
}
}
impl<S: UdpSender> ops::DerefMut for RudpReceiver<S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.pkt_rx
}
}
async fn example(tx: &RudpSender<Client>, rx: &mut RudpReceiver<Client>) -> io::Result<()> {
// send hello packet
let mut mtpkt = vec![];
mtpkt.write_u16::<BigEndian>(2)?; // high level type
mtpkt.write_u8(29)?; // serialize ver
mtpkt.write_u16::<BigEndian>(0)?; // compression modes
mtpkt.write_u16::<BigEndian>(40)?; // MinProtoVer
mtpkt.write_u16::<BigEndian>(40)?; // MaxProtoVer
mtpkt.write_u16::<BigEndian>(6)?; // player name length
mtpkt.write(b"foobar")?; // player name
tx.send(Pkt {
unrel: true,
chan: 1,
data: &mtpkt,
})
.await?;
// handle incoming packets
while let Some(result) = rx.recv().await {
match result {
Ok(pkt) => {
println!("{}", pkt.data.hex_dump());
}
Err(err) => eprintln!("Error: {}", err),
}
}
Ok(())
}
#[tokio::main]
async fn main() -> io::Result<()> {
let (tx, mut rx) = connect("127.0.0.1:30000").await?;
tokio::select! {
_ = tokio::signal::ctrl_c() => println!("canceled"),
res = example(&tx, &mut rx) => {
res?;
println!("disconnected");
}
}
// close either the receiver or the sender
// this shuts down associated tasks
rx.close().await;
Ok(())
}
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