Feature: Keysend custom tlv

bindings/ldk_node.udl

@@ -152,6 +152,8 @@ interface SpontaneousPayment {
 	[Throws=NodeError]
 	PaymentId send(u64 amount_msat, PublicKey node_id, SendingParameters? sending_parameters);
 	[Throws=NodeError]
+	PaymentId send_with_custom_tlvs(u64 amount_msat, PublicKey node_id, SendingParameters? sending_parameters, sequence<CustomTlvRecord> custom_tlvs);
+	[Throws=NodeError]
 	void send_probes(u64 amount_msat, PublicKey node_id);
 };
 
@@ -182,6 +184,7 @@ enum NodeError {
 	"OfferCreationFailed",
 	"RefundCreationFailed",
 	"PaymentSendingFailed",
+	"InvalidCustomTlvs",
 	"ProbeSendingFailed",
 	"ChannelCreationFailed",
 	"ChannelClosingFailed",
@@ -275,8 +278,8 @@ enum VssHeaderProviderError {
 interface Event {
 	PaymentSuccessful(PaymentId? payment_id, PaymentHash payment_hash, PaymentPreimage? payment_preimage, u64? fee_paid_msat);
 	PaymentFailed(PaymentId? payment_id, PaymentHash? payment_hash, PaymentFailureReason? reason);
-	PaymentReceived(PaymentId? payment_id, PaymentHash payment_hash, u64 amount_msat);
-	PaymentClaimable(PaymentId payment_id, PaymentHash payment_hash, u64 claimable_amount_msat, u32? claim_deadline);
+	PaymentReceived(PaymentId? payment_id, PaymentHash payment_hash, u64 amount_msat, sequence<CustomTlvRecord> custom_records);
+	PaymentClaimable(PaymentId payment_id, PaymentHash payment_hash, u64 claimable_amount_msat, u32? claim_deadline, sequence<CustomTlvRecord> custom_records);
 	PaymentForwarded(ChannelId prev_channel_id, ChannelId next_channel_id, UserChannelId? prev_user_channel_id, UserChannelId? next_user_channel_id, u64? total_fee_earned_msat, u64? skimmed_fee_msat, boolean claim_from_onchain_tx, u64? outbound_amount_forwarded_msat);
 	ChannelPending(ChannelId channel_id, UserChannelId user_channel_id, ChannelId former_temporary_channel_id, PublicKey counterparty_node_id, OutPoint funding_txo);
 	ChannelReady(ChannelId channel_id, UserChannelId user_channel_id, PublicKey? counterparty_node_id);
@@ -362,6 +365,11 @@ dictionary SendingParameters {
 	u8? max_channel_saturation_power_of_half;
 };
 
+dictionary CustomTlvRecord {
+	u64 type_num;
+	sequence<u8> value;
+};
+
 [Enum]
 interface MaxTotalRoutingFeeLimit {
 	None ();

src/error.rs

@@ -34,6 +34,8 @@ pub enum Error {
 	RefundCreationFailed,
 	/// Sending a payment has failed.
 	PaymentSendingFailed,
+	/// Sending of spontaneous payment with custom TLVs failed.
+	InvalidCustomTlvs,
 	/// Sending a payment probe has failed.
 	ProbeSendingFailed,
 	/// A channel could not be opened.
@@ -130,6 +132,7 @@ impl fmt::Display for Error {
 			Self::OfferCreationFailed => write!(f, "Failed to create offer."),
 			Self::RefundCreationFailed => write!(f, "Failed to create refund."),
 			Self::PaymentSendingFailed => write!(f, "Failed to send the given payment."),
+			Self::InvalidCustomTlvs => write!(f, "Failed to construct payment with custom TLVs."),
 			Self::ProbeSendingFailed => write!(f, "Failed to send the given payment probe."),
 			Self::ChannelCreationFailed => write!(f, "Failed to create channel."),
 			Self::ChannelClosingFailed => write!(f, "Failed to close channel."),

src/event.rs

@@ -5,7 +5,7 @@
 // http://opensource.org/licenses/MIT>, at your option. You may not use this file except in
 // accordance with one or both of these licenses.
 
-use crate::types::{DynStore, Sweeper, Wallet};
+use crate::types::{CustomTlvRecord, DynStore, Sweeper, Wallet};
 
 use crate::{
 	hex_utils, BumpTransactionEventHandler, ChannelManager, Config, Error, Graph, PeerInfo,
@@ -102,6 +102,8 @@ pub enum Event {
 		payment_hash: PaymentHash,
 		/// The value, in thousandths of a satoshi, that has been received.
 		amount_msat: u64,
+		/// Custom TLV records received on the payment
+		custom_records: Vec<CustomTlvRecord>,
 	},
 	/// A payment has been forwarded.
 	PaymentForwarded {
@@ -168,6 +170,8 @@ pub enum Event {
 		/// The block height at which this payment will be failed back and will no longer be
 		/// eligible for claiming.
 		claim_deadline: Option<u32>,
+		/// Custom TLV records attached to the payment
+		custom_records: Vec<CustomTlvRecord>,
 	},
 	/// A channel has been created and is pending confirmation on-chain.
 	ChannelPending {
@@ -224,6 +228,7 @@ impl_writeable_tlv_based_enum!(Event,
 		(0, payment_hash, required),
 		(1, payment_id, option),
 		(2, amount_msat, required),
+		(3, custom_records, optional_vec),
 	},
 	(3, ChannelReady) => {
 		(0, channel_id, required),
@@ -248,6 +253,7 @@ impl_writeable_tlv_based_enum!(Event,
 		(2, payment_id, required),
 		(4, claimable_amount_msat, required),
 		(6, claim_deadline, option),
+		(7, custom_records, optional_vec),
 	},
 	(7, PaymentForwarded) => {
 		(0, prev_channel_id, required),
@@ -542,7 +548,7 @@ where
 				via_channel_id: _,
 				via_user_channel_id: _,
 				claim_deadline,
-				onion_fields: _,
+				onion_fields,
 				counterparty_skimmed_fee_msat,
 			} => {
 				let payment_id = PaymentId(payment_hash.0);
@@ -644,11 +650,17 @@ where
 									"We would have registered the preimage if we knew"
 								);
 
+								let custom_records = onion_fields
+									.map(|cf| {
+										cf.custom_tlvs().into_iter().map(|tlv| tlv.into()).collect()
+									})
+									.unwrap_or_default();
 								let event = Event::PaymentClaimable {
 									payment_id,
 									payment_hash,
 									claimable_amount_msat: amount_msat,
 									claim_deadline,
+									custom_records,
 								};
 								match self.event_queue.add_event(event) {
 									Ok(_) => return Ok(()),
@@ -799,7 +811,7 @@ where
 				receiver_node_id: _,
 				htlcs: _,
 				sender_intended_total_msat: _,
-				onion_fields: _,
+				onion_fields,
 			} => {
 				let payment_id = PaymentId(payment_hash.0);
 				log_info!(
@@ -875,6 +887,9 @@ where
 					payment_id: Some(payment_id),
 					payment_hash,
 					amount_msat,
+					custom_records: onion_fields
+						.map(|cf| cf.custom_tlvs().into_iter().map(|tlv| tlv.into()).collect())
+						.unwrap_or_default(),
 				};
 				match self.event_queue.add_event(event) {
 					Ok(_) => return Ok(()),

src/lib.rs

@@ -140,7 +140,7 @@ use types::{
 	Broadcaster, BumpTransactionEventHandler, ChainMonitor, ChannelManager, DynStore, Graph,
 	KeysManager, OnionMessenger, PeerManager, Router, Scorer, Sweeper, Wallet,
 };
-pub use types::{ChannelDetails, PeerDetails, UserChannelId};
+pub use types::{ChannelDetails, CustomTlvRecord, PeerDetails, UserChannelId};
 
 use logger::{log_error, log_info, log_trace, FilesystemLogger, Logger};
 

src/payment/spontaneous.rs

@@ -14,7 +14,7 @@ use crate::payment::store::{
 	PaymentDetails, PaymentDirection, PaymentKind, PaymentStatus, PaymentStore,
 };
 use crate::payment::SendingParameters;
-use crate::types::{ChannelManager, KeysManager};
+use crate::types::{ChannelManager, CustomTlvRecord, KeysManager};
 
 use lightning::ln::channelmanager::{PaymentId, RecipientOnionFields, Retry, RetryableSendFailure};
 use lightning::ln::{PaymentHash, PaymentPreimage};
@@ -58,6 +58,21 @@ impl SpontaneousPayment {
 	/// node-wide parameters configured via [`Config::sending_parameters`] on a per-field basis.
 	pub fn send(
 		&self, amount_msat: u64, node_id: PublicKey, sending_parameters: Option<SendingParameters>,
+	) -> Result<PaymentId, Error> {
+		self.send_inner(amount_msat, node_id, sending_parameters, None)
+	}
+
+	/// Send a spontaneous payment including a list of custom TLVs.
+	pub fn send_with_custom_tlvs(
+		&self, amount_msat: u64, node_id: PublicKey, sending_parameters: Option<SendingParameters>,
+		custom_tlvs: Vec<CustomTlvRecord>,
+	) -> Result<PaymentId, Error> {
+		self.send_inner(amount_msat, node_id, sending_parameters, Some(custom_tlvs))
+	}
+
+	fn send_inner(
+		&self, amount_msat: u64, node_id: PublicKey, sending_parameters: Option<SendingParameters>,
+		custom_tlvs: Option<Vec<CustomTlvRecord>>,
 	) -> Result<PaymentId, Error> {
 		let rt_lock = self.runtime.read().unwrap();
 		if rt_lock.is_none() {
@@ -97,7 +112,15 @@ impl SpontaneousPayment {
 				.map(|s| route_params.payment_params.max_channel_saturation_power_of_half = s);
 		};
 
-		let recipient_fields = RecipientOnionFields::spontaneous_empty();
+		let recipient_fields = match custom_tlvs {
+			Some(tlvs) => RecipientOnionFields::spontaneous_empty()
+				.with_custom_tlvs(tlvs.into_iter().map(|tlv| (tlv.type_num, tlv.value)).collect())
+				.map_err(|e| {
+					log_error!(self.logger, "Failed to send payment with custom TLVs: {:?}", e);
+					Error::InvalidCustomTlvs
+				})?,
+			None => RecipientOnionFields::spontaneous_empty(),
+		};
 
 		match self.channel_manager.send_spontaneous_payment_with_retry(
 			Some(payment_preimage),

src/types.rs

@@ -12,6 +12,7 @@ use crate::logger::FilesystemLogger;
 use crate::message_handler::NodeCustomMessageHandler;
 
 use lightning::chain::chainmonitor;
+use lightning::impl_writeable_tlv_based;
 use lightning::ln::channel_state::ChannelDetails as LdkChannelDetails;
 use lightning::ln::msgs::RoutingMessageHandler;
 use lightning::ln::msgs::SocketAddress;
@@ -348,3 +349,23 @@ pub struct PeerDetails {
 	/// Indicates whether we currently have an active connection with the peer.
 	pub is_connected: bool,
 }
+
+/// Custom TLV entry.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct CustomTlvRecord {
+	/// Type number.
+	pub type_num: u64,
+	/// Serialized value.
+	pub value: Vec<u8>,
+}
+
+impl_writeable_tlv_based!(CustomTlvRecord, {
+	(0, type_num, required),
+	(2, value, required),
+});
+
+impl From<&(u64, Vec<u8>)> for CustomTlvRecord {
+	fn from(tlv: &(u64, Vec<u8>)) -> Self {
+		CustomTlvRecord { type_num: tlv.0, value: tlv.1.clone() }
+	}
+}

src/uniffi_types.rs

@@ -16,6 +16,7 @@ pub use crate::config::{
 pub use crate::graph::{ChannelInfo, ChannelUpdateInfo, NodeAnnouncementInfo, NodeInfo};
 pub use crate::payment::store::{LSPFeeLimits, PaymentDirection, PaymentKind, PaymentStatus};
 pub use crate::payment::{MaxTotalRoutingFeeLimit, QrPaymentResult, SendingParameters};
+pub use crate::types::CustomTlvRecord;
 
 pub use lightning::chain::channelmonitor::BalanceSource;
 pub use lightning::events::{ClosureReason, PaymentFailureReason};

tests/common/mod.rs

@@ -11,7 +11,10 @@
 use ldk_node::config::{Config, EsploraSyncConfig};
 use ldk_node::io::sqlite_store::SqliteStore;
 use ldk_node::payment::{PaymentDirection, PaymentKind, PaymentStatus};
-use ldk_node::{Builder, Event, LightningBalance, LogLevel, Node, NodeError, PendingSweepBalance};
+use ldk_node::{
+	Builder, CustomTlvRecord, Event, LightningBalance, LogLevel, Node, NodeError,
+	PendingSweepBalance,
+};
 
 use lightning::ln::msgs::SocketAddress;
 use lightning::ln::{PaymentHash, PaymentPreimage};
@@ -751,14 +754,18 @@ pub(crate) fn do_channel_full_cycle<E: ElectrumApi>(
 	// Test spontaneous/keysend payments
 	println!("\nA send_spontaneous_payment");
 	let keysend_amount_msat = 2500_000;
-	let keysend_payment_id =
-		node_a.spontaneous_payment().send(keysend_amount_msat, node_b.node_id(), None).unwrap();
+	let custom_tlvs = vec![CustomTlvRecord { type_num: 13377331, value: vec![1, 2, 3] }];
+	let keysend_payment_id = node_a
+		.spontaneous_payment()
+		.send_with_custom_tlvs(keysend_amount_msat, node_b.node_id(), None, custom_tlvs.clone())
+		.unwrap();
 	expect_event!(node_a, PaymentSuccessful);
-	let received_keysend_amount = match node_b.wait_next_event() {
-		ref e @ Event::PaymentReceived { amount_msat, .. } => {
+	let next_event = node_b.wait_next_event();
+	let (received_keysend_amount, received_custom_records) = match next_event {
+		ref e @ Event::PaymentReceived { amount_msat, ref custom_records, .. } => {
 			println!("{} got event {:?}", std::stringify!(node_b), e);
 			node_b.event_handled();
-			amount_msat
+			(amount_msat, custom_records)
 		},
 		ref e => {
 			panic!("{} got unexpected event!: {:?}", std::stringify!(node_b), e);
@@ -772,6 +779,7 @@ pub(crate) fn do_channel_full_cycle<E: ElectrumApi>(
 		node_a.payment(&keysend_payment_id).unwrap().kind,
 		PaymentKind::Spontaneous { .. }
 	));
+	assert_eq!(received_custom_records, &custom_tlvs);
 	assert_eq!(node_b.payment(&keysend_payment_id).unwrap().status, PaymentStatus::Succeeded);
 	assert_eq!(node_b.payment(&keysend_payment_id).unwrap().direction, PaymentDirection::Inbound);
 	assert_eq!(node_b.payment(&keysend_payment_id).unwrap().amount_msat, Some(keysend_amount_msat));