Allow to listen on and advertise multiple SocketAddr

bindings/kotlin/ldk-node-android/lib/src/androidTest/kotlin/org/lightningdevkit/ldknode/AndroidLibTest.kt

@@ -26,8 +26,8 @@ class AndroidLibTest {
         val listenAddress1 = "127.0.0.1:2323"
         val listenAddress2 = "127.0.0.1:2324"
 
-        val config1 = Config(tmpDir1, network, listenAddress1, 2048u)
-        val config2 = Config(tmpDir2, network, listenAddress2, 2048u)
+        val config1 = Config(tmpDir1, network, listOf(listenAddress1), 2048u)
+        val config2 = Config(tmpDir2, network, listOf(listenAddress2), 2048u)
 
         val builder1 = Builder.fromConfig(config1)
         val builder2 = Builder.fromConfig(config2)

bindings/kotlin/ldk-node-jvm/lib/src/test/kotlin/org/lightningdevkit/ldknode/LibraryTest.kt

@@ -116,15 +116,15 @@ class LibraryTest {
 
         val config1 = Config()
         config1.storageDirPath = tmpDir1
-        config1.listeningAddress = listenAddress1
+        config1.listeningAddresses = listOf(listenAddress1)
         config1.network = Network.REGTEST
         config1.logLevel = LogLevel.TRACE
 
         println("Config 1: $config1")
 
         val config2 = Config()
         config2.storageDirPath = tmpDir2
-        config2.listeningAddress = listenAddress2
+        config2.listeningAddresses = listOf(listenAddress2)
         config2.network = Network.REGTEST
         config2.logLevel = LogLevel.TRACE
         println("Config 2: $config2")

bindings/ldk_node.udl

@@ -6,7 +6,7 @@ dictionary Config {
 	string storage_dir_path = "/tmp/ldk_node/";
 	string? log_dir_path = null;
 	Network network = "Bitcoin";
-	SocketAddress? listening_address = null;
+	sequence<SocketAddress>? listening_addresses = null;
 	u32 default_cltv_expiry_delta = 144;
 	u64 onchain_wallet_sync_interval_secs = 80;
 	u64 wallet_sync_interval_secs = 30;
@@ -29,7 +29,8 @@ interface Builder {
 	void set_gossip_source_rgs(string rgs_server_url);
 	void set_storage_dir_path(string storage_dir_path);
 	void set_network(Network network);
-	void set_listening_address(SocketAddress listening_address);
+	[Throws=BuildError]
+	void set_listening_addresses(sequence<SocketAddress> listening_addresses);
 	[Throws=BuildError]
 	LDKNode build();
 };
@@ -43,7 +44,7 @@ interface LDKNode {
 	Event wait_next_event();
 	void event_handled();
 	PublicKey node_id();
-	SocketAddress? listening_address();
+	sequence<SocketAddress>? listening_addresses();
 	[Throws=NodeError]
 	Address new_onchain_address();
 	[Throws=NodeError]
@@ -133,6 +134,7 @@ enum BuildError {
 	"InvalidSeedFile",
 	"InvalidSystemTime",
 	"InvalidChannelMonitor",
+	"InvalidListeningAddresses",
 	"ReadFailed",
 	"WriteFailed",
 	"StoragePathAccessFailed",

bindings/python/src/ldk_node/test_ldk_node.py

@@ -80,13 +80,13 @@ def send_to_address(address, amount_sats):
     return res
 
 
-def setup_node(tmp_dir, esplora_endpoint, listening_address):
+def setup_node(tmp_dir, esplora_endpoint, listening_addresses):
     config = Config()
     builder = Builder.from_config(config)
     builder.set_storage_dir_path(tmp_dir)
     builder.set_esplora_server(esplora_endpoint)
     builder.set_network(DEFAULT_TEST_NETWORK)
-    builder.set_listening_address(listening_address)
+    builder.set_listening_addresses(listening_addresses)
     return builder.build()
 
 def get_esplora_endpoint():
@@ -109,8 +109,8 @@ def test_channel_full_cycle(self):
         tmp_dir_1 = tempfile.TemporaryDirectory("_ldk_node_1")
         print("TMP DIR 1:", tmp_dir_1.name)
 
-        listening_address_1 = "127.0.0.1:2323"
-        node_1 = setup_node(tmp_dir_1.name, esplora_endpoint, listening_address_1)
+        listening_addresses_1 = ["127.0.0.1:2323"]
+        node_1 = setup_node(tmp_dir_1.name, esplora_endpoint, listening_addresses_1)
         node_1.start()
         node_id_1 = node_1.node_id()
         print("Node ID 1:", node_id_1)
@@ -119,8 +119,8 @@ def test_channel_full_cycle(self):
         tmp_dir_2 = tempfile.TemporaryDirectory("_ldk_node_2")
         print("TMP DIR 2:", tmp_dir_2.name)
 
-        listening_address_2 = "127.0.0.1:2324"
-        node_2 = setup_node(tmp_dir_2.name, esplora_endpoint, listening_address_2)
+        listening_addresses_2 = ["127.0.0.1:2324"]
+        node_2 = setup_node(tmp_dir_2.name, esplora_endpoint, listening_addresses_2)
         node_2.start()
         node_id_2 = node_2.node_id()
         print("Node ID 2:", node_id_2)
@@ -155,7 +155,7 @@ def test_channel_full_cycle(self):
         print("TOTAL 2:", total_balance_2)
         self.assertEqual(total_balance_2, 100000)
 
-        node_1.connect_open_channel(node_id_2, listening_address_2, 50000, None, None, True)
+        node_1.connect_open_channel(node_id_2, listening_addresses_2[0], 50000, None, None, True)
 
         channel_pending_event_1 = node_1.wait_next_event()
         assert isinstance(channel_pending_event_1, Event.CHANNEL_PENDING)

src/builder.rs

@@ -90,6 +90,8 @@ pub enum BuildError {
 	InvalidSystemTime,
 	/// The a read channel monitor is invalid.
 	InvalidChannelMonitor,
+	/// The given listening addresses are invalid, e.g. too many were passed.
+	InvalidListeningAddresses,
 	/// We failed to read data from the [`KVStore`].
 	ReadFailed,
 	/// We failed to write data to the [`KVStore`].
@@ -113,8 +115,9 @@ impl fmt::Display for BuildError {
 				write!(f, "System time is invalid. Clocks might have gone back in time.")
 			}
 			Self::InvalidChannelMonitor => {
-				write!(f, "Failed to watch a deserialzed ChannelMonitor")
+				write!(f, "Failed to watch a deserialized ChannelMonitor")
 			}
+			Self::InvalidListeningAddresses => write!(f, "Given listening addresses are invalid."),
 			Self::ReadFailed => write!(f, "Failed to read from store."),
 			Self::WriteFailed => write!(f, "Failed to write to store."),
 			Self::StoragePathAccessFailed => write!(f, "Failed to access the given storage path."),
@@ -231,9 +234,15 @@ impl NodeBuilder {
 	}
 
 	/// Sets the IP address and TCP port on which [`Node`] will listen for incoming network connections.
-	pub fn set_listening_address(&mut self, listening_address: SocketAddress) -> &mut Self {
-		self.config.listening_address = Some(listening_address);
-		self
+	pub fn set_listening_addresses(
+		&mut self, listening_addresses: Vec<SocketAddress>,
+	) -> Result<&mut Self, BuildError> {
+		if listening_addresses.len() > 100 {
+			return Err(BuildError::InvalidListeningAddresses);
+		}
+
+		self.config.listening_addresses = Some(listening_addresses);
+		Ok(self)
 	}
 
 	/// Sets the level at which [`Node`] will log messages.
@@ -386,8 +395,10 @@ impl ArcedNodeBuilder {
 	}
 
 	/// Sets the IP address and TCP port on which [`Node`] will listen for incoming network connections.
-	pub fn set_listening_address(&self, listening_address: SocketAddress) {
-		self.inner.write().unwrap().set_listening_address(listening_address);
+	pub fn set_listening_addresses(
+		&self, listening_addresses: Vec<SocketAddress>,
+	) -> Result<(), BuildError> {
+		self.inner.write().unwrap().set_listening_addresses(listening_addresses).map(|_| ())
 	}
 
 	/// Sets the level at which [`Node`] will log messages.

src/lib.rs

@@ -207,7 +207,7 @@ const WALLET_KEYS_SEED_LEN: usize = 64;
 /// | `storage_dir_path`                     | /tmp/ldk_node/     |
 /// | `log_dir_path`                         | None               |
 /// | `network`                              | Bitcoin            |
-/// | `listening_address`                    | None               |
+/// | `listening_addresses`                  | None               |
 /// | `default_cltv_expiry_delta`            | 144                |
 /// | `onchain_wallet_sync_interval_secs`    | 80                 |
 /// | `wallet_sync_interval_secs`            | 30                 |
@@ -225,8 +225,8 @@ pub struct Config {
 	pub log_dir_path: Option<String>,
 	/// The used Bitcoin network.
 	pub network: Network,
-	/// The IP address and TCP port the node will listen on.
-	pub listening_address: Option<SocketAddress>,
+	/// The addresses on which the node will listen for incoming connections.
+	pub listening_addresses: Option<Vec<SocketAddress>>,
 	/// The default CLTV expiry delta to be used for payments.
 	pub default_cltv_expiry_delta: u32,
 	/// The time in-between background sync attempts of the onchain wallet, in seconds.
@@ -264,7 +264,7 @@ impl Default for Config {
 			storage_dir_path: DEFAULT_STORAGE_DIR_PATH.to_string(),
 			log_dir_path: None,
 			network: DEFAULT_NETWORK,
-			listening_address: None,
+			listening_addresses: None,
 			default_cltv_expiry_delta: DEFAULT_CLTV_EXPIRY_DELTA,
 			onchain_wallet_sync_interval_secs: DEFAULT_BDK_WALLET_SYNC_INTERVAL_SECS,
 			wallet_sync_interval_secs: DEFAULT_LDK_WALLET_SYNC_INTERVAL_SECS,
@@ -490,38 +490,33 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 			});
 		}
 
-		if let Some(listening_address) = &self.config.listening_address {
+		if let Some(listening_addresses) = &self.config.listening_addresses {
 			// Setup networking
 			let peer_manager_connection_handler = Arc::clone(&self.peer_manager);
 			let mut stop_listen = self.stop_receiver.clone();
-			let listening_address = listening_address.clone();
 			let listening_logger = Arc::clone(&self.logger);
 
-			let bind_addr = listening_address
-				.to_socket_addrs()
-				.map_err(|_| {
-					log_error!(
-						self.logger,
-						"Unable to resolve listing address: {:?}",
-						listening_address
-					);
-					Error::InvalidSocketAddress
-				})?
-				.next()
-				.ok_or_else(|| {
+			let mut bind_addrs = Vec::with_capacity(listening_addresses.len());
+
+			for listening_addr in listening_addresses {
+				let resolved_address = listening_addr.to_socket_addrs().map_err(|e| {
 					log_error!(
 						self.logger,
-						"Unable to resolve listing address: {:?}",
-						listening_address
+						"Unable to resolve listening address: {:?}. Error details: {}",
+						listening_addr,
+						e,
 					);
 					Error::InvalidSocketAddress
 				})?;
 
+				bind_addrs.extend(resolved_address);
+			}
+
 			runtime.spawn(async move {
 				let listener =
-					tokio::net::TcpListener::bind(bind_addr).await
+					tokio::net::TcpListener::bind(&*bind_addrs).await
 										.unwrap_or_else(|e| {
-											log_error!(listening_logger, "Failed to bind to listen address/port - is something else already listening on it?: {}", e);
+											log_error!(listening_logger, "Failed to bind to listen addresses/ports - is something else already listening on it?: {}", e);
 											panic!(
 												"Failed to bind to listen address/port - is something else already listening on it?",
 												);
@@ -631,8 +626,13 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 								continue;
 							}
 
-							let addresses =
-								bcast_config.listening_address.iter().cloned().collect();
+							let addresses = bcast_config.listening_addresses.clone().unwrap_or(Vec::new());
+
+							if addresses.is_empty() {
+								// Skip if we are not listening on any addresses.
+								continue;
+							}
+
 							bcast_pm.broadcast_node_announcement([0; 3], [0; 32], addresses);
 
 							let unix_time_secs = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
@@ -781,9 +781,9 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 		self.channel_manager.get_our_node_id()
 	}
 
-	/// Returns our own listening address.
-	pub fn listening_address(&self) -> Option<SocketAddress> {
-		self.config.listening_address.clone()
+	/// Returns our own listening addresses.
+	pub fn listening_addresses(&self) -> Option<Vec<SocketAddress>> {
+		self.config.listening_addresses.clone()
 	}
 
 	/// Retrieve a new on-chain/funding address.

src/test/functional_tests.rs

@@ -77,7 +77,7 @@ fn do_channel_full_cycle<K: KVStore + Sync + Send>(
 	node_a
 		.connect_open_channel(
 			node_b.node_id(),
-			node_b.listening_address().unwrap().into(),
+			node_b.listening_addresses().unwrap().first().unwrap().clone(),
 			funding_amount_sat,
 			Some(push_msat),
 			None,
@@ -332,7 +332,7 @@ fn channel_open_fails_when_funds_insufficient() {
 		Err(Error::InsufficientFunds),
 		node_a.connect_open_channel(
 			node_b.node_id(),
-			node_b.listening_address().unwrap().into(),
+			node_b.listening_addresses().unwrap().first().unwrap().clone(),
 			120000,
 			None,
 			None,

src/test/utils.rs

@@ -1,6 +1,7 @@
 use crate::builder::NodeBuilder;
 use crate::io::test_utils::TestSyncStore;
 use crate::{Config, Node};
+use lightning::ln::msgs::SocketAddress;
 use lightning::util::logger::{Level, Logger, Record};
 
 use bitcoin::{Address, Amount, Network, OutPoint, Txid};
@@ -134,6 +135,19 @@ pub fn random_port() -> u16 {
 	rng.gen_range(5000..65535)
 }
 
+pub fn random_listening_addresses() -> Vec<SocketAddress> {
+	let num_addresses = 2;
+	let mut listening_addresses = Vec::with_capacity(num_addresses);
+
+	for _ in 0..num_addresses {
+		let rand_port = random_port();
+		let address: SocketAddress = format!("127.0.0.1:{}", rand_port).parse().unwrap();
+		listening_addresses.push(address);
+	}
+
+	listening_addresses
+}
+
 pub fn random_config() -> Config {
 	let mut config = Config::default();
 
@@ -144,10 +158,9 @@ pub fn random_config() -> Config {
 	println!("Setting random LDK storage dir: {}", rand_dir.display());
 	config.storage_dir_path = rand_dir.to_str().unwrap().to_owned();
 
-	let rand_port = random_port();
-	println!("Setting random LDK listening port: {}", rand_port);
-	let listening_address_str = format!("127.0.0.1:{}", rand_port);
-	config.listening_address = Some(listening_address_str.parse().unwrap());
+	let rand_listening_addresses = random_listening_addresses();
+	println!("Setting random LDK listening addresses: {:?}", rand_listening_addresses);
+	config.listening_addresses = Some(rand_listening_addresses);
 
 	config.log_level = Level::Trace;