1 use crate::{error::Error, *};
2 use byteorder::{BigEndian, ReadBytesExt};
10 use tokio::sync::{mpsc, Mutex};
12 fn to_seqnum(seqnum: u16) -> usize {
13 (seqnum as usize) & (REL_BUFFER - 1)
16 type Result = std::result::Result<(), Error>;
19 timestamp: time::Instant,
23 packets: Vec<Cell<Option<Vec<u8>>>>, // in the good old days this used to be called char **
24 splits: HashMap<u16, Split>,
29 pub struct RecvWorker<R: UdpReceiver, S: UdpSender> {
30 share: Arc<RudpShare<S>>,
31 chans: Arc<Vec<Mutex<Chan>>>,
32 pkt_tx: mpsc::UnboundedSender<InPkt>,
36 impl<R: UdpReceiver, S: UdpSender> RecvWorker<R, S> {
37 pub async fn new(udp_rx: R, share: Arc<RudpShare<S>>, pkt_tx: mpsc::UnboundedSender<InPkt>) {
47 packets: (0..REL_BUFFER).map(|_| Cell::new(None)).collect(),
49 splits: HashMap::new(),
59 pub async fn run(&self) {
60 let cleanup_chans = Arc::downgrade(&self.chans);
61 tokio::spawn(async move {
62 let timeout = time::Duration::from_secs(TIMEOUT);
63 let mut interval = tokio::time::interval(timeout);
65 while let Some(chans) = Weak::upgrade(&cleanup_chans) {
66 for chan in chans.iter() {
67 let mut ch = chan.lock().await;
70 .drain_filter(|_k, v| v.timestamp.elapsed() < timeout)
74 interval.tick().await;
79 if let Err(e) = self.handle(self.recv_pkt().await) {
80 if let Error::LocalDisco = e {
87 data: &[CtlType::Disco as u8],
98 async fn recv_pkt(&self) -> Result {
101 // todo: reset timeout
102 let mut cursor = io::Cursor::new(self.udp_rx.recv().await?);
104 let proto_id = cursor.read_u32::<BigEndian>()?;
105 if proto_id != PROTO_ID {
106 do yeet InvalidProtoId(proto_id);
109 let peer_id = cursor.read_u16::<BigEndian>()?;
111 let n_chan = cursor.read_u8()?;
114 .get(n_chan as usize)
115 .ok_or(InvalidChannel(n_chan))?
119 self.process_pkt(cursor, &mut chan)
122 fn process_pkt(&self, mut cursor: io::Cursor<Vec<u8>>, chan: &mut Chan) -> Result {
127 match cursor.read_u8()?.try_into()? {
128 Ctl => match cursor.read_u8()?.try_into()? {
129 Disco => return Err(RemoteDisco),
135 self.pkt_tx.send(Ok(Pkt {
138 data: cursor.remaining_slice().into(),
143 dbg!(cursor.remaining_slice());
148 let seqnum = cursor.read_u16::<BigEndian>()?;
149 chan.packets[to_seqnum(seqnum)].set(Some(cursor.remaining_slice().into()));
151 while let Some(pkt) = chan.packets[to_seqnum(chan.seqnum)].take() {
152 self.handle(self.process_pkt(io::Cursor::new(pkt), chan))?;
153 chan.seqnum = chan.seqnum.overflowing_add(1).0;
161 fn handle(&self, res: Result) -> Result {
166 Err(RemoteDisco) => Err(RemoteDisco),
167 Err(LocalDisco) => Err(LocalDisco),
168 Err(e) => Ok(self.pkt_tx.send(Err(e))?),