Expose provided InitFeatures in PeerManager::get_peer_node_ids

Previously, we wouldn't offer any way to retrieve the features a
peer provided in their `Init` message.

Here, we allow to retrieve them via `get_peer_node_ids`, similar to the
`SocketAddress`es.

fuzz/src/full_stack.rs

@@ -739,7 +739,7 @@ pub fn do_test(mut data: &[u8], logger: &Arc<dyn Logger>) {
 			19 => {
 				let mut list = loss_detector.handler.get_peer_node_ids();
 				list.sort_by_key(|v| v.0);
-				if let Some((id, _)) = list.get(0) {
+				if let Some((id, _, _)) = list.get(0) {
 					loss_detector.handler.disconnect_by_node_id(*id);
 				}
 			},

lightning/src/ln/peer_handler.rs

@@ -958,8 +958,8 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 		}
 	}
 
-	/// Get a list of tuples mapping from node id to network addresses for peers which have
-	/// completed the initial handshake.
+	/// Get a list of tuples mapping from node id to network addresses and init features for peers
+	/// which have completed the initial handshake.
 	///
 	/// For outbound connections, the [`PublicKey`] will be the same as the `their_node_id` parameter
 	/// passed in to [`Self::new_outbound_connection`], however entries will only appear once the initial
@@ -968,14 +968,15 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 	///
 	/// The returned `Option`s will only be `Some` if an address had been previously given via
 	/// [`Self::new_outbound_connection`] or [`Self::new_inbound_connection`].
-	pub fn get_peer_node_ids(&self) -> Vec<(PublicKey, Option<SocketAddress>)> {
+	pub fn get_peer_node_ids(&self) -> Vec<(PublicKey, Option<SocketAddress>, InitFeatures)> {
 		let peers = self.peers.read().unwrap();
 		peers.values().filter_map(|peer_mutex| {
 			let p = peer_mutex.lock().unwrap();
 			if !p.handshake_complete() {
 				return None;
 			}
-			Some((p.their_node_id.unwrap().0, p.their_socket_address.clone()))
+			Some((p.their_node_id.unwrap().0, p.their_socket_address.clone(),
+				p.their_features.clone().unwrap()))
 		}).collect()
 	}
 
@@ -2746,6 +2747,8 @@ mod tests {
 		};
 		let addr_a = SocketAddress::TcpIpV4{addr: [127, 0, 0, 1], port: 1000};
 		let id_b = peer_b.node_signer.get_node_id(Recipient::Node).unwrap();
+		let features_a = peer_a.init_features(&id_b);
+		let features_b = peer_b.init_features(&id_a);
 		let mut fd_b = FileDescriptor {
 			fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())),
 			disconnect: Arc::new(AtomicBool::new(false)),
@@ -2767,8 +2770,8 @@ mod tests {
 		let a_data = fd_a.outbound_data.lock().unwrap().split_off(0);
 		assert_eq!(peer_b.read_event(&mut fd_b, &a_data).unwrap(), false);
 
-		assert!(peer_a.get_peer_node_ids().contains(&(id_b, Some(addr_b))));
-		assert!(peer_b.get_peer_node_ids().contains(&(id_a, Some(addr_a))));
+		assert!(peer_a.get_peer_node_ids().contains(&(id_b, Some(addr_b), features_b)));
+		assert!(peer_b.get_peer_node_ids().contains(&(id_a, Some(addr_a), features_a)));
 
 		(fd_a.clone(), fd_b.clone())
 	}