Expose update_channel_config method

Author: tnull

bindings/ldk_node.udl

@@ -58,6 +58,8 @@ interface LDKNode {
 	[Throws=NodeError]
 	void close_channel([ByRef]ChannelId channel_id, PublicKey counterparty_node_id);
 	[Throws=NodeError]
+	void update_channel_config([ByRef]ChannelId channel_id, PublicKey counterparty_node_id, [ByRef]ChannelConfig channel_config);
+	[Throws=NodeError]
 	void sync_wallets();
 	[Throws=NodeError]
 	PaymentHash send_payment([ByRef]Invoice invoice);
@@ -90,6 +92,7 @@ enum NodeError {
 	"PaymentSendingFailed",
 	"ChannelCreationFailed",
 	"ChannelClosingFailed",
+	"ChannelConfigUpdateFailed",
 	"PersistenceFailed",
 	"WalletOperationFailed",
 	"OnchainTxSigningFailed",
@@ -181,6 +184,14 @@ dictionary PeerDetails {
 	boolean is_connected;
 };
 
+dictionary ChannelConfig {
+	u32 forwarding_fee_proportional_millionths;
+	u32 forwarding_fee_base_msat;
+	u16 cltv_expiry_delta;
+	u64 max_dust_htlc_exposure_msat;
+	u64 force_close_avoidance_max_fee_satoshis;
+};
+
 enum LogLevel {
 	"Gossip",
 	"Trace",

src/error.rs

@@ -19,6 +19,8 @@ pub enum Error {
 	ChannelCreationFailed,
 	/// A channel could not be closed.
 	ChannelClosingFailed,
+	/// A channel config could not be updated.
+	ChannelConfigUpdateFailed,
 	/// Persistence failed.
 	PersistenceFailed,
 	/// A wallet operation failed.
@@ -72,6 +74,7 @@ impl fmt::Display for Error {
 			Self::PaymentSendingFailed => write!(f, "Failed to send the given payment."),
 			Self::ChannelCreationFailed => write!(f, "Failed to create channel."),
 			Self::ChannelClosingFailed => write!(f, "Failed to close channel."),
+			Self::ChannelConfigUpdateFailed => write!(f, "Failed to update channel config."),
 			Self::PersistenceFailed => write!(f, "Failed to persist data."),
 			Self::WalletOperationFailed => write!(f, "Failed to conduct wallet operation."),
 			Self::OnchainTxSigningFailed => write!(f, "Failed to sign given transaction."),

src/lib.rs

@@ -135,7 +135,7 @@ use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler};
 use lightning::ln::{PaymentHash, PaymentPreimage};
 use lightning::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringParameters};
 
-use lightning::util::config::{ChannelHandshakeConfig, UserConfig};
+use lightning::util::config::{ChannelConfig, ChannelHandshakeConfig, UserConfig};
 pub use lightning::util::logger::Level as LogLevel;
 use lightning::util::ser::ReadableArgs;
 
@@ -1504,6 +1504,16 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 		}
 	}
 
+	/// Update the config for a previously opened channel.
+	pub fn update_channel_config(
+		&self, channel_id: &ChannelId, counterparty_node_id: PublicKey,
+		channel_config: &ChannelConfig,
+	) -> Result<(), Error> {
+		self.channel_manager
+			.update_channel_config(&counterparty_node_id, &[channel_id.0], channel_config)
+			.map_err(|_| Error::ChannelConfigUpdateFailed)
+	}
+
 	/// Send a payement given an invoice.
 	pub fn send_payment(&self, invoice: &Invoice) -> Result<PaymentHash, Error> {
 		let rt_lock = self.runtime.read().unwrap();