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use core::fmt;
use std::{
sync::{Arc, Mutex},
task::{Context, Poll},
};
use futures::{channel::mpsc, StreamExt};
use libp2p_core::{transport::PortUse, Endpoint, Multiaddr};
use libp2p_identity::PeerId;
use libp2p_swarm::{
self as swarm, dial_opts::DialOpts, ConnectionDenied, ConnectionId, FromSwarm,
NetworkBehaviour, THandler, THandlerInEvent, THandlerOutEvent, ToSwarm,
};
use swarm::{
behaviour::ConnectionEstablished, dial_opts::PeerCondition, ConnectionClosed, DialError,
DialFailure,
};
use crate::{handler::Handler, shared::Shared, Control};
/// A generic behaviour for stream-oriented protocols.
pub struct Behaviour {
shared: Arc<Mutex<Shared>>,
dial_receiver: mpsc::Receiver<PeerId>,
}
impl Default for Behaviour {
fn default() -> Self {
Self::new()
}
}
impl Behaviour {
pub fn new() -> Self {
let (dial_sender, dial_receiver) = mpsc::channel(0);
Self {
shared: Arc::new(Mutex::new(Shared::new(dial_sender))),
dial_receiver,
}
}
/// Obtain a new [`Control`].
pub fn new_control(&self) -> Control {
Control::new(self.shared.clone())
}
}
/// The protocol is already registered.
#[derive(Debug)]
pub struct AlreadyRegistered;
impl fmt::Display for AlreadyRegistered {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "The protocol is already registered")
}
}
impl std::error::Error for AlreadyRegistered {}
impl NetworkBehaviour for Behaviour {
type ConnectionHandler = Handler;
type ToSwarm = ();
fn handle_established_inbound_connection(
&mut self,
connection_id: ConnectionId,
peer: PeerId,
_: &Multiaddr,
_: &Multiaddr,
) -> Result<THandler<Self>, ConnectionDenied> {
Ok(Handler::new(
peer,
self.shared.clone(),
Shared::lock(&self.shared).receiver(peer, connection_id),
))
}
fn handle_established_outbound_connection(
&mut self,
connection_id: ConnectionId,
peer: PeerId,
_: &Multiaddr,
_: Endpoint,
_: PortUse,
) -> Result<THandler<Self>, ConnectionDenied> {
Ok(Handler::new(
peer,
self.shared.clone(),
Shared::lock(&self.shared).receiver(peer, connection_id),
))
}
fn on_swarm_event(&mut self, event: FromSwarm) {
match event {
FromSwarm::ConnectionEstablished(ConnectionEstablished {
peer_id,
connection_id,
..
}) => Shared::lock(&self.shared).on_connection_established(connection_id, peer_id),
FromSwarm::ConnectionClosed(ConnectionClosed { connection_id, .. }) => {
Shared::lock(&self.shared).on_connection_closed(connection_id)
}
FromSwarm::DialFailure(DialFailure {
peer_id: Some(peer_id),
error:
error @ (DialError::Transport(_)
| DialError::Denied { .. }
| DialError::NoAddresses
| DialError::WrongPeerId { .. }),
..
}) => {
let reason = error.to_string(); // We can only forward the string repr but it is better than nothing.
Shared::lock(&self.shared).on_dial_failure(peer_id, reason)
}
_ => {}
}
}
fn on_connection_handler_event(
&mut self,
_peer_id: PeerId,
_connection_id: ConnectionId,
event: THandlerOutEvent<Self>,
) {
void::unreachable(event);
}
fn poll(
&mut self,
cx: &mut Context<'_>,
) -> Poll<ToSwarm<Self::ToSwarm, THandlerInEvent<Self>>> {
if let Poll::Ready(Some(peer)) = self.dial_receiver.poll_next_unpin(cx) {
return Poll::Ready(ToSwarm::Dial {
opts: DialOpts::peer_id(peer)
.condition(PeerCondition::DisconnectedAndNotDialing)
.build(),
});
}
Poll::Pending
}
}
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