Merge pull request #2019 from tnull/2023-02-expose-peer-addrs

Expose peer addresses in `PeerManager`

diff --git a/lightning/src/ln/peer_handler.rs b/lightning/src/ln/peer_handler.rs
index 89862f29fec2568ca66151ea498c685d0402a80b..37867adff32d164caa1f3fc3e78f65f49ff1e8d3 100644 (file)
--- a/lightning/src/ln/peer_handler.rs
+++ b/lightning/src/ln/peer_handler.rs
@@ -734,20 +734,26 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
                }
        }
 
-       /// Get the list of node ids for peers which have completed the initial handshake.
+       /// Get a list of tuples mapping from node id to network addresses for peers which have
+       /// completed the initial handshake.
        ///
-       /// For outbound connections, this will be the same as the their_node_id parameter passed in to
-       /// new_outbound_connection, however entries will only appear once the initial handshake has
-       /// completed and we are sure the remote peer has the private key for the given node_id.
-       pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
+       /// 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
+       /// handshake has completed and we are sure the remote peer has the private key for the given
+       /// [`PublicKey`].
+       ///
+       /// 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<NetAddress>)> {
                let peers = self.peers.read().unwrap();
                peers.values().filter_map(|peer_mutex| {
                        let p = peer_mutex.lock().unwrap();
-                       if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
+                       if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() ||
+                               p.their_node_id.is_none() {
                                return None;
                        }
-                       p.their_node_id
-               }).map(|(node_id, _)| node_id).collect()
+                       Some((p.their_node_id.unwrap().0, p.their_net_address.clone()))
+               }).collect()
        }
 
        fn get_ephemeral_key(&self) -> SecretKey {
@@ -757,7 +763,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
                SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
        }
 
-       /// Indicates a new outbound connection has been established to a node with the given node_id
+       /// Indicates a new outbound connection has been established to a node with the given `node_id`
        /// and an optional remote network address.
        ///
        /// The remote network address adds the option to report a remote IP address back to a connecting
@@ -2147,11 +2153,14 @@ mod tests {
        }
 
        fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, IgnoringMessageHandler, &'a test_utils::TestLogger, IgnoringMessageHandler, &'a test_utils::TestNodeSigner>) -> (FileDescriptor, FileDescriptor) {
-               let a_id = peer_a.node_signer.get_node_id(Recipient::Node).unwrap();
+               let id_a = peer_a.node_signer.get_node_id(Recipient::Node).unwrap();
                let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
+               let addr_a = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1000};
+               let id_b = peer_b.node_signer.get_node_id(Recipient::Node).unwrap();
                let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
-               let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone(), None).unwrap();
-               peer_a.new_inbound_connection(fd_a.clone(), None).unwrap();
+               let addr_b = NetAddress::IPv4{addr: [127, 0, 0, 1], port: 1001};
+               let initial_data = peer_b.new_outbound_connection(id_a, fd_b.clone(), Some(addr_a.clone())).unwrap();
+               peer_a.new_inbound_connection(fd_a.clone(), Some(addr_b.clone())).unwrap();
                assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
                peer_a.process_events();
 
@@ -2166,6 +2175,9 @@ 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))));
+
                (fd_a.clone(), fd_b.clone())
        }