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use crate::message_proto::{hole_punch, HolePunch};
use asynchronous_codec::Framed;
use futures::{future::BoxFuture, prelude::*};
use futures_timer::Delay;
use instant::Instant;
use libp2p_core::{multiaddr::Protocol, upgrade, Multiaddr};
use libp2p_swarm::NegotiatedSubstream;
use std::convert::TryFrom;
use std::iter;
use thiserror::Error;
pub struct Upgrade {
obs_addrs: Vec<Multiaddr>,
}
impl upgrade::UpgradeInfo for Upgrade {
type Info = &'static [u8];
type InfoIter = iter::Once<Self::Info>;
fn protocol_info(&self) -> Self::InfoIter {
iter::once(super::PROTOCOL_NAME)
}
}
impl Upgrade {
pub fn new(obs_addrs: Vec<Multiaddr>) -> Self {
Self { obs_addrs }
}
}
impl upgrade::OutboundUpgrade<NegotiatedSubstream> for Upgrade {
type Output = Connect;
type Error = UpgradeError;
type Future = BoxFuture<'static, Result<Self::Output, Self::Error>>;
fn upgrade_outbound(self, substream: NegotiatedSubstream, _: Self::Info) -> Self::Future {
let mut substream = Framed::new(
substream,
prost_codec::Codec::new(super::MAX_MESSAGE_SIZE_BYTES),
);
let msg = HolePunch {
r#type: hole_punch::Type::Connect.into(),
obs_addrs: self.obs_addrs.into_iter().map(|a| a.to_vec()).collect(),
};
async move {
substream.send(msg).await?;
let sent_time = Instant::now();
let HolePunch { r#type, obs_addrs } =
substream.next().await.ok_or(UpgradeError::StreamClosed)??;
let rtt = sent_time.elapsed();
let r#type = hole_punch::Type::from_i32(r#type).ok_or(UpgradeError::ParseTypeField)?;
match r#type {
hole_punch::Type::Connect => {}
hole_punch::Type::Sync => return Err(UpgradeError::UnexpectedTypeSync),
}
let obs_addrs = if obs_addrs.is_empty() {
return Err(UpgradeError::NoAddresses);
} else {
obs_addrs
.into_iter()
.filter_map(|a| match Multiaddr::try_from(a) {
Ok(a) => Some(a),
Err(e) => {
log::debug!("Unable to parse multiaddr: {e}");
None
}
})
.filter(|a| {
if a.iter().any(|p| p == Protocol::P2pCircuit) {
log::debug!("Dropping relayed address {a}");
false
} else {
true
}
})
.collect::<Vec<Multiaddr>>()
};
let msg = HolePunch {
r#type: hole_punch::Type::Sync.into(),
obs_addrs: vec![],
};
substream.send(msg).await?;
Delay::new(rtt / 2).await;
Ok(Connect { obs_addrs })
}
.boxed()
}
}
pub struct Connect {
pub obs_addrs: Vec<Multiaddr>,
}
#[derive(Debug, Error)]
pub enum UpgradeError {
#[error(transparent)]
Codec(#[from] prost_codec::Error),
#[error("Stream closed")]
StreamClosed,
#[error("Expected 'status' field to be set.")]
MissingStatusField,
#[error("Expected 'reservation' field to be set.")]
MissingReservationField,
#[error("Expected at least one address in reservation.")]
NoAddresses,
#[error("Invalid expiration timestamp in reservation.")]
InvalidReservationExpiration,
#[deprecated(since = "0.8.1", note = "Error is no longer constructed.")]
#[error("Invalid addresses in reservation.")]
InvalidAddrs,
#[error("Failed to parse response type field.")]
ParseTypeField,
#[error("Unexpected message type 'connect'")]
UnexpectedTypeConnect,
#[error("Unexpected message type 'sync'")]
UnexpectedTypeSync,
#[error("Failed to parse response type field.")]
ParseStatusField,
}