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use errors::*;
use std::convert::From;
use protocol::{DatConnection, DatNetMessage};
use network_msgs::*;
use metadata_msgs::Index;
use bitfield::Bitfield;
use sodiumoxide::crypto::stream::Key;
use protobuf::parse_from_bytes;
use make_discovery_key;
/// Wraps a low-level DatConnection with extra state about active feeds, bitfields that the
/// remote has declared they Have, etc.
pub struct DatPeer {
feeds: Vec<Key>,
conn: DatConnection,
remote_has: Vec<Vec<Bitfield>>,
}
impl DatPeer {
/// Has the remote peer indicated they have the given chunk in the given feed?
pub fn has(self, feed: u64, index: u64) -> Result<bool> {
for bitfield in self.remote_has[feed as usize].iter() {
if bitfield.get(index)? {
return Ok(true)
}
}
Ok(false)
}
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 == key {
warn!("tried to add existing feed/key on a DatPeer 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.conn.send_msg(&DatNetMessage::Feed(feed_msg), index as u8)?;
self.feeds.push(key.clone());
self.remote_has.push(vec![]);
Ok(())
}
/// hyperdrive-specific helper for discovering the public key for the "content" feed
/// from the "metadata" feed , and sending a Feed message to initialize on this connection.
pub fn init_data_feed(&mut self) -> Result<()> {
if self.feeds.len() > 1 {
return Ok(());
}
let data_key = self.get_drive_data_key()?;
self.add_feed(&data_key[0..32])
}
/// hyperdrive-specific helper for returning the "data" feed public key (aka, index=1)
pub fn get_drive_data_key(&mut self) -> Result<Key> {
if self.feeds.len() > 1 {
// we already have the key
let key = self.feeds[1].clone();
return Ok(key);
}
// Info: downloading, not uploading
let mut im = Info::new();
im.set_uploading(false);
im.set_downloading(true);
self.conn.send_msg(&DatNetMessage::Info(im), 0)?;
// Have: nothing (so far)
let mut hm = Have::new();
hm.set_start(0);
hm.set_length(0);
self.conn.send_msg(&DatNetMessage::Have(hm), 0)?;
// UnHave: still nothing
let mut uhm = Unhave::new();
uhm.set_start(0);
self.conn.send_msg(&DatNetMessage::Unhave(uhm), 0)?;
// Want: just the first element
let mut wm = Want::new();
wm.set_start(0);
wm.set_length(1);
self.conn.send_msg(&DatNetMessage::Want(wm), 0)?;
// listen for Have
loop {
let (msg, feed_index) = self.conn.recv_msg()?;
if feed_index == 1 {
continue;
}
if let DatNetMessage::Have(_) = msg {
break;
} else {
info!("Expected Have message, got: {:?}", &msg);
continue;
}
}
// Request
let mut rm = Request::new();
rm.set_index(0);
self.conn.send_msg(&DatNetMessage::Request(rm), 0)?;
loop {
let (msg, feed_index) = self.conn.recv_msg()?;
if feed_index == 1 {
info!("Expected other message channel");
continue;
}
if let DatNetMessage::Data(dm) = msg {
info!("Got metadata: {}", dm.get_index());
if dm.get_index() == 0 {
let index_msg = parse_from_bytes::<Index>(&mut dm.get_value())?;
if index_msg.get_field_type() == "hyperdrive" {
let data_key = index_msg.get_content();
if data_key.len() != 32 {
bail!("Received data key had wrong length: {}", data_key.len());
}
// TODO: ok_or(), but what?
return Ok(Key::from_slice(&data_key[0..32]).unwrap());
} else {
bail!("non-hyperdrive Index type: {}", index_msg.get_field_type());
}
}
} else {
info!("Expected Data message, got: {:?}", &msg);
continue;
}
}
}
}
impl From<DatConnection> for DatPeer {
fn from(dc: DatConnection) -> DatPeer {
let key = dc.key.clone();
DatPeer {
feeds: vec![key],
conn: dc,
remote_has: vec![vec![]],
}
}
}
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