node: Make sure we properly disconnect outbounds

The previous change to the wire protocol introduced a bug: outbound
peers that failed to connect fully would not notify the service on
disconnect. This change fixes it.

radicle-node/src/service.rs

@@ -2205,6 +2205,12 @@ impl DisconnectReason {
     pub fn is_connection_err(&self) -> bool {
         matches!(self, Self::Connection(_))
     }
+
+    pub fn connection() -> Self {
+        DisconnectReason::Connection(Arc::new(std::io::Error::from(
+            std::io::ErrorKind::ConnectionReset,
+        )))
+    }
 }
 
 impl fmt::Display for DisconnectReason {

radicle-node/src/wire/protocol.rs

@@ -419,8 +419,10 @@ where
     fn cleanup(&mut self, id: ResourceId, fd: RawFd) {
         if self.inbound.remove(&fd).is_some() {
             log::debug!(target: "wire", "Cleaning up inbound peer state with id={id} (fd={fd})");
-        } else if self.outbound.remove(&fd).is_some() {
+        } else if let Some(outbound) = self.outbound.remove(&fd) {
             log::debug!(target: "wire", "Cleaning up outbound peer state with id={id} (fd={fd})");
+            self.service
+                .disconnected(outbound.nid, &DisconnectReason::connection());
         } else {
             log::warn!(target: "wire", "Tried to cleanup unknown peer with id={id} (fd={fd})");
         }
@@ -494,7 +496,7 @@ where
 
     fn handle_registered(&mut self, fd: RawFd, id: ResourceId) {
         if let Some(outbound) = self.outbound.get_mut(&fd) {
-            log::debug!(target: "wire", "Outbound peer resource registered with id={id} (fd={fd})");
+            log::debug!(target: "wire", "Outbound peer resource registered for {} with id={id} (fd={fd})", outbound.nid);
             outbound.id = Some(id);
         } else if let Some(inbound) = self.inbound.get_mut(&fd) {
             log::debug!(target: "wire", "Inbound peer resource registered with id={id} (fd={fd})");
@@ -673,28 +675,25 @@ where
                 // TODO: This should be a fatal error, there's nothing we can do here.
                 log::error!(target: "wire", "Received error: listener {} disconnected", id);
             }
-            reactor::Error::TransportDisconnect(id, session) => {
+            reactor::Error::TransportDisconnect(id, transport) => {
-                let fd = session.as_raw_fd();
+                let fd = transport.as_raw_fd();
                 log::error!(target: "wire", "Received error: peer id={id} (fd={fd}) disconnected");
 
                 // We're dropping the TCP connection here.
-                drop(session);
+                drop(transport);
 
                 // The peer transport is already disconnected and removed from the reactor;
                 // therefore there is no need to initiate a disconnection. We simply remove
                 // the peer from the map.
                 match self.peers.remove(&id) {
                     Some(mut peer) => {
-                        let reason = DisconnectReason::Connection(Arc::new(io::Error::from(
-                            io::ErrorKind::ConnectionReset,
-                        )));
-
                         if let Peer::Connected { streams, .. } = &mut peer {
                             streams.shutdown();
                         }
 
                         if let Some(id) = peer.id() {
-                            self.service.disconnected(*id, &reason);
+                            self.service
+                                .disconnected(*id, &DisconnectReason::connection());
                         } else {
                             log::debug!(target: "wire", "Inbound disconnection before handshake; ignoring..")
                         }
@@ -795,6 +794,11 @@ where
                         NetTransport::<WireSession<G>>::with_session(session, Link::Outbound)
                     }) {
                         Ok(transport) => {
+                            log::debug!(
+                                target: "wire",
+                                "Registering transport for {node_id} (fd={})..",
+                                transport.as_raw_fd()
+                            );
                             self.outbound.insert(
                                 transport.as_raw_fd(),
                                 Outbound {