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#![feature(cursor_remaining)]
#![feature(hash_drain_filter)]
#![feature(once_cell)]
mod client;
mod error;
mod new;
mod recv;
mod send;
pub use prelude::*;
use async_trait::async_trait;
use num_enum::TryFromPrimitive;
use std::{cell::OnceCell, collections::HashMap, io, ops, sync::Arc, time::Instant};
use tokio::{
sync::{mpsc, watch, Mutex, RwLock},
task::JoinSet,
};
#[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> {
pub unrel: bool,
pub chan: u8,
pub data: T,
}
pub type InPkt = Result<Pkt<Vec<u8>>, error::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)]
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> $T<S> {
pub async fn peer_id(&self) -> u16 {
self.share.id
}
pub async fn is_server(&self) -> bool {
self.share.id == PeerID::Srv as u16
}
pub async fn close(self) {
self.share.close_tx.send(true).ok();
let mut tasks = self.share.tasks.lock().await;
while let Some(res) = tasks.join_next().await {
res.ok(); // TODO: handle error (?)
}
}
}
};
}
impl_share!(RudpReceiver);
impl_share!(RudpSender);
impl<S: UdpSender> ops::Deref for RudpReceiver<S> {
type Target = mpsc::UnboundedReceiver<InPkt>;
fn deref(&self) -> &Self::Target {
&self.pkt_rx
}
}
impl<S: UdpSender> ops::DerefMut for RudpReceiver<S> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.pkt_rx
}
}
#[derive(Debug)]
struct Split {
timestamp: Option<Instant>,
chunks: Vec<OnceCell<Vec<u8>>>,
got: usize,
}
struct RecvChan {
packets: Vec<Option<Vec<u8>>>, // char ** 😛
splits: HashMap<u16, Split>,
seqnum: u16,
num: u8,
}
struct RecvWorker<R: UdpReceiver, S: UdpSender> {
share: Arc<RudpShare<S>>,
close: watch::Receiver<bool>,
chans: Arc<Vec<Mutex<RecvChan>>>,
pkt_tx: mpsc::UnboundedSender<InPkt>,
udp_rx: R,
}
mod prelude {
pub const PROTO_ID: u32 = 0x4f457403;
pub const UDP_PKT_SIZE: usize = 512;
pub const NUM_CHANS: usize = 3;
pub const REL_BUFFER: usize = 0x8000;
pub const INIT_SEQNUM: u16 = 65500;
pub const TIMEOUT: u64 = 30;
pub const PING_TIMEOUT: u64 = 5;
pub use super::{
client::{connect, Sender as Client},
error::Error,
new::new,
CtlType, InPkt, PeerID, Pkt, PktType, RudpReceiver, RudpSender, UdpReceiver, UdpSender,
};
#[macro_export]
macro_rules! ticker {
($duration:expr, $close:expr, $body:block) => {
let mut interval = tokio::time::interval($duration);
while tokio::select!{
_ = interval.tick() => true,
_ = $close.changed() => false,
} $body
};
}
}
|
