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use std::{
io,
sync::{Arc, Mutex},
task::{Context, Poll},
};
use futures::{
channel::{mpsc, oneshot},
StreamExt as _,
};
use libp2p_identity::PeerId;
use libp2p_swarm::{
self as swarm,
handler::{ConnectionEvent, DialUpgradeError, FullyNegotiatedInbound, FullyNegotiatedOutbound},
ConnectionHandler, Stream, StreamProtocol,
};
use crate::{shared::Shared, upgrade::Upgrade, OpenStreamError};
pub struct Handler {
remote: PeerId,
shared: Arc<Mutex<Shared>>,
receiver: mpsc::Receiver<NewStream>,
pending_upgrade: Option<(
StreamProtocol,
oneshot::Sender<Result<Stream, OpenStreamError>>,
)>,
}
impl Handler {
pub(crate) fn new(
remote: PeerId,
shared: Arc<Mutex<Shared>>,
receiver: mpsc::Receiver<NewStream>,
) -> Self {
Self {
shared,
receiver,
pending_upgrade: None,
remote,
}
}
}
impl ConnectionHandler for Handler {
type FromBehaviour = void::Void;
type ToBehaviour = void::Void;
type InboundProtocol = Upgrade;
type OutboundProtocol = Upgrade;
type InboundOpenInfo = ();
type OutboundOpenInfo = ();
fn listen_protocol(
&self,
) -> swarm::SubstreamProtocol<Self::InboundProtocol, Self::InboundOpenInfo> {
swarm::SubstreamProtocol::new(
Upgrade {
supported_protocols: Shared::lock(&self.shared).supported_inbound_protocols(),
},
(),
)
}
fn poll(
&mut self,
cx: &mut Context<'_>,
) -> Poll<
swarm::ConnectionHandlerEvent<
Self::OutboundProtocol,
Self::OutboundOpenInfo,
Self::ToBehaviour,
>,
> {
if self.pending_upgrade.is_some() {
return Poll::Pending;
}
match self.receiver.poll_next_unpin(cx) {
Poll::Ready(Some(new_stream)) => {
self.pending_upgrade = Some((new_stream.protocol.clone(), new_stream.sender));
return Poll::Ready(swarm::ConnectionHandlerEvent::OutboundSubstreamRequest {
protocol: swarm::SubstreamProtocol::new(
Upgrade {
supported_protocols: vec![new_stream.protocol],
},
(),
),
});
}
Poll::Ready(None) => {} // Sender is gone, no more work to do.
Poll::Pending => {}
}
Poll::Pending
}
fn on_behaviour_event(&mut self, event: Self::FromBehaviour) {
void::unreachable(event)
}
fn on_connection_event(
&mut self,
event: ConnectionEvent<
Self::InboundProtocol,
Self::OutboundProtocol,
Self::InboundOpenInfo,
Self::OutboundOpenInfo,
>,
) {
match event {
ConnectionEvent::FullyNegotiatedInbound(FullyNegotiatedInbound {
protocol: (stream, protocol),
info: (),
}) => {
Shared::lock(&self.shared).on_inbound_stream(self.remote, stream, protocol);
}
ConnectionEvent::FullyNegotiatedOutbound(FullyNegotiatedOutbound {
protocol: (stream, actual_protocol),
info: (),
}) => {
let Some((expected_protocol, sender)) = self.pending_upgrade.take() else {
debug_assert!(
false,
"Negotiated an outbound stream without a back channel"
);
return;
};
debug_assert_eq!(expected_protocol, actual_protocol);
let _ = sender.send(Ok(stream));
}
ConnectionEvent::DialUpgradeError(DialUpgradeError { error, info: () }) => {
let Some((p, sender)) = self.pending_upgrade.take() else {
debug_assert!(
false,
"Received a `DialUpgradeError` without a back channel"
);
return;
};
let error = match error {
swarm::StreamUpgradeError::Timeout => {
OpenStreamError::Io(io::Error::from(io::ErrorKind::TimedOut))
}
swarm::StreamUpgradeError::Apply(v) => void::unreachable(v),
swarm::StreamUpgradeError::NegotiationFailed => {
OpenStreamError::UnsupportedProtocol(p)
}
swarm::StreamUpgradeError::Io(io) => OpenStreamError::Io(io),
};
let _ = sender.send(Err(error));
}
_ => {}
}
}
}
/// Message from a [`Control`](crate::Control) to a [`ConnectionHandler`] to negotiate a new outbound stream.
#[derive(Debug)]
pub(crate) struct NewStream {
pub(crate) protocol: StreamProtocol,
pub(crate) sender: oneshot::Sender<Result<Stream, OpenStreamError>>,
}
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