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use errors::*;
use std::thread;
use std::net::ToSocketAddrs;
use std::fmt::Display;
use std::time::Duration;
use protocol::{DatConnection, DatNetMessage};
use network_msgs::*;
use sodiumoxide::crypto::stream::Key;
use make_discovery_key;
use chan;
/// Wraps a low-level DatConnection in a thread (or two). Contains very little context about
/// itself.
pub struct DatPeerThread {
pub handle: u64,
feeds: Vec<(u8, Key)>,
outbound_chan: chan::Sender<(DatNetMessage, u8)>,
}
pub struct PeerMsg {
pub peer_handle: u64,
pub feed_index: u8,
pub msg: DatNetMessage,
}
/// This is what the "receive" loop does: simply blocking reads on the TCP socket, passing any
/// received messages into a channel back to the worker thread.
fn receiver_loop(mut dc: DatConnection, peer_rx: chan::Sender<Result<(DatNetMessage, u8)>>) {
loop {
match dc.recv_msg() {
Ok((msg, feed_index)) => {
peer_rx.send(Ok((msg, feed_index)));
},
Err(e) => {
peer_rx.send(Err(e));
return
},
}
}
}
/// Worker thread. After initializing the connection, loops endlessly. Looks for outgoing PeerMsg
/// on the command channel, and sends these directly (blocking). Also looks for raw received
/// messages (via a spawned receiver thread), and enhances these with extra context then passes
/// upwards on the unified peer message channel.
fn worker_thread(mut dc: DatConnection, handle: u64, outbound_chan: chan::Receiver<(DatNetMessage, u8)>, unified_chan: chan::Sender<Result<PeerMsg>>) {
dc.tcp.set_write_timeout(Some(Duration::new(2, 0)));
let rx_dc = dc.clone();
let (receiver_chan, raw_peer_rx) = chan::async();
thread::spawn(move || {
receiver_loop(rx_dc, receiver_chan);
});
loop {
chan_select!{
outbound_chan.recv() -> val => {
if let Some((msg, feed_index)) = val {
match dc.send_msg(&msg, feed_index) {
Ok(_) => {},
Err(e) => {
// TODO: error chain!
unified_chan.send(Err(e));
return
}
}
};
},
raw_peer_rx.recv() -> val => {
if let Some(Ok((msg, feed_index))) = val {
// do mapping between feed index and feed pubkey here
let pm = PeerMsg {
peer_handle: handle,
feed_index: feed_index,
msg,
};
unified_chan.send(Ok(pm));
};
}
};
}
}
impl DatPeerThread {
pub fn connect<A: ToSocketAddrs + Display>(addr: A, feed_key: Key, handle: u64, is_live: bool, local_id: Option<&[u8]>, unified_chan: chan::Sender<Result<PeerMsg>>) -> Result<DatPeerThread> {
let addr = addr.to_socket_addrs().unwrap().nth(0).unwrap();
let (outbound_chan, tx_chan) = chan::async();
let feed_key2 = feed_key.clone();
// Do an ugly little dance to copy local_id across thread barrier
let mut id_buf = [0; 32];
let local_id = match local_id {
None => None,
Some(val) => {
id_buf.copy_from_slice(val);
Some(id_buf)
},
};
thread::spawn(move || {
let local_id = match local_id {
None => None,
Some(val) => {
Some(&id_buf[..])
},
};
let dc = match DatConnection::connect(addr, &feed_key, is_live, local_id) {
Ok(c) => c,
Err(e) => {
// TODO: error chain!
unified_chan.send(Err(e));
return;
},
};
worker_thread(dc, handle, tx_chan, unified_chan);
});
let dp = DatPeerThread {
handle,
outbound_chan,
feeds: vec![(0, feed_key2)],
};
Ok(dp)
}
pub fn send(&mut self, net_msg: DatNetMessage, feed_index: u8) -> Result<()> {
self.outbound_chan.send((net_msg, feed_index));
Ok(())
}
pub fn add_feed(&mut self, key: &[u8]) -> Result<()> {
let key_bytes = key;
let key = Key::from_slice(key_bytes).unwrap();
for k in self.feeds.iter() {
if (*k).1 == key {
warn!("tried to add existing feed/key on a DatPeerThread connection");
return Ok(())
}
}
let index = self.feeds.len();
assert!(index < 256);
let discovery_key = make_discovery_key(key_bytes);;
// Send (encrypted) Feed message for data feed
let mut feed_msg = Feed::new();
feed_msg.set_discoveryKey(discovery_key.to_vec());
self.outbound_chan.send((DatNetMessage::Feed(feed_msg), index as u8));
self.feeds.push((index as u8, key.clone()));
Ok(())
}
}
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