Expose update_channel_config method

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();