Allow setting default DNS resolvers for HRNs

Author: chuksys

bindings/ldk_node.udl

@@ -13,6 +13,11 @@ dictionary Config {
 	u64 probing_liquidity_limit_multiplier;
 	AnchorChannelsConfig? anchor_channels_config;
 	SendingParameters? sending_parameters;
+	HumanReadableNamesConfig? hrn_config;
+};
+
+dictionary HumanReadableNamesConfig {
+	sequence<PublicKey> dns_resolvers_node_ids;
 };
 
 dictionary AnchorChannelsConfig {
@@ -312,6 +317,7 @@ enum NodeError {
 	"LiquiditySourceUnavailable",
 	"LiquidityFeeTooHigh",
 	"HrnParsingFailed",
+	"DnsResolversUnavailable",
 };
 
 dictionary NodeStatus {
@@ -347,6 +353,7 @@ enum BuildError {
 	"WalletSetupFailed",
 	"LoggerSetupFailed",
 	"NetworkMismatch",
+	"DnsResolversUnavailable",
 };
 
 [Trait]

src/builder.rs

@@ -174,6 +174,10 @@ pub enum BuildError {
 	LoggerSetupFailed,
 	/// The given network does not match the node's previously configured network.
 	NetworkMismatch,
+	/// The [`dns_resolvers_node_ids`] provided for HRN resolution is empty.
+	///
+	/// [`dns_resolvers_node_ids`]: crate::config::HumanReadableNamesConfig::dns_resolvers_node_ids
+	DnsResolversUnavailable,
 }
 
 impl fmt::Display for BuildError {
@@ -201,6 +205,9 @@ impl fmt::Display for BuildError {
 			Self::NetworkMismatch => {
 				write!(f, "Given network does not match the node's previously configured network.")
 			},
+			Self::DnsResolversUnavailable => {
+				write!(f, "The DNS resolvers provided for HRN resolution is empty.")
+			},
 		}
 	}
 }
@@ -1492,6 +1499,12 @@ fn build_with_store_internal(
 		},
 	};
 
+	if let Some(hrn_config) = &config.hrn_config {
+		if hrn_config.dns_resolvers_node_ids.is_empty() {
+			return Err(BuildError::DnsResolversUnavailable);
+		}
+	};
+
 	let (stop_sender, _) = tokio::sync::watch::channel(());
 	let (event_handling_stopped_sender, _) = tokio::sync::watch::channel(());
 

src/config.rs

@@ -103,6 +103,7 @@ pub const WALLET_KEYS_SEED_LEN: usize = 64;
 /// | `log_level`                            | Debug              |
 /// | `anchor_channels_config`               | Some(..)           |
 /// | `sending_parameters`                   | None               |
+/// | `hrn_config`                           | None               |
 ///
 /// See [`AnchorChannelsConfig`] and [`SendingParameters`] for more information regarding their
 /// respective default values.
@@ -167,6 +168,10 @@ pub struct Config {
 	/// **Note:** If unset, default parameters will be used, and you will be able to override the
 	/// parameters on a per-payment basis in the corresponding method calls.
 	pub sending_parameters: Option<SendingParameters>,
+	/// Configuration options for Human-Readable Names ([BIP 353]).
+	///
+	/// [BIP 353]: https://github.com/bitcoin/bips/blob/master/bip-0353.mediawiki
+	pub hrn_config: Option<HumanReadableNamesConfig>,
 }
 
 impl Default for Config {
@@ -181,6 +186,7 @@ impl Default for Config {
 			anchor_channels_config: Some(AnchorChannelsConfig::default()),
 			sending_parameters: None,
 			node_alias: None,
+			hrn_config: None,
 		}
 	}
 }