Move lsp_fee_limits to PaymentKind::Bolt11Jit variant

bindings/ldk_node.udl

@@ -222,6 +222,7 @@ interface ClosureReason {
 interface PaymentKind {
 	Onchain();
 	Bolt11();
+	Bolt11Jit(LSPFeeLimits lsp_fee_limits);
 	Spontaneous();
 };
 
@@ -249,7 +250,6 @@ dictionary PaymentDetails {
 	u64? amount_msat;
 	PaymentDirection direction;
 	PaymentStatus status;
-	LSPFeeLimits? lsp_fee_limits;
 };
 
 [NonExhaustive]

src/event.rs

@@ -432,17 +432,22 @@ where
 						return;
 					}
 
-					let max_total_opening_fee_msat = info
-						.lsp_fee_limits
-						.and_then(|l| {
-							l.max_total_opening_fee_msat.or_else(|| {
-								l.max_proportional_opening_fee_ppm_msat.and_then(|max_prop_fee| {
-									// If it's a variable amount payment, compute the actual fee.
-									compute_opening_fee(amount_msat, 0, max_prop_fee)
+					let max_total_opening_fee_msat = match info.kind {
+						Some(PaymentKind::Bolt11Jit { lsp_fee_limits }) => {
+							lsp_fee_limits
+								.max_total_opening_fee_msat
+								.or_else(|| {
+									lsp_fee_limits.max_proportional_opening_fee_ppm_msat.and_then(
+										|max_prop_fee| {
+											// If it's a variable amount payment, compute the actual fee.
+											compute_opening_fee(amount_msat, 0, max_prop_fee)
+										},
+									)
 								})
-							})
-						})
-						.unwrap_or(0);
+								.unwrap_or(0)
+						},
+						_ => 0,
+					};
 
 					if counterparty_skimmed_fee_msat > max_total_opening_fee_msat {
 						log_info!(
@@ -558,7 +563,6 @@ where
 							amount_msat: Some(amount_msat),
 							direction: PaymentDirection::Inbound,
 							status: PaymentStatus::Succeeded,
-							lsp_fee_limits: None,
 						};
 
 						match self.payment_store.insert(payment) {

src/payment/bolt11.rs

@@ -110,7 +110,6 @@ impl Bolt11Payment {
 					amount_msat: invoice.amount_milli_satoshis(),
 					direction: PaymentDirection::Outbound,
 					status: PaymentStatus::Pending,
-					lsp_fee_limits: None,
 				};
 				self.payment_store.insert(payment)?;
 
@@ -129,7 +128,6 @@ impl Bolt11Payment {
 							amount_msat: invoice.amount_milli_satoshis(),
 							direction: PaymentDirection::Outbound,
 							status: PaymentStatus::Failed,
-							lsp_fee_limits: None,
 						};
 
 						self.payment_store.insert(payment)?;
@@ -218,7 +216,6 @@ impl Bolt11Payment {
 					amount_msat: Some(amount_msat),
 					direction: PaymentDirection::Outbound,
 					status: PaymentStatus::Pending,
-					lsp_fee_limits: None,
 				};
 				self.payment_store.insert(payment)?;
 
@@ -238,7 +235,6 @@ impl Bolt11Payment {
 							amount_msat: Some(amount_msat),
 							direction: PaymentDirection::Outbound,
 							status: PaymentStatus::Failed,
-							lsp_fee_limits: None,
 						};
 						self.payment_store.insert(payment)?;
 
@@ -299,7 +295,6 @@ impl Bolt11Payment {
 			amount_msat,
 			direction: PaymentDirection::Inbound,
 			status: PaymentStatus::Pending,
-			lsp_fee_limits: None,
 		};
 
 		self.payment_store.insert(payment)?;
@@ -414,19 +409,19 @@ impl Bolt11Payment {
 
 		// Register payment in payment store.
 		let payment_hash = PaymentHash(invoice.payment_hash().to_byte_array());
-		let lsp_fee_limits = Some(LSPFeeLimits {
+		let lsp_fee_limits = LSPFeeLimits {
 			max_total_opening_fee_msat: lsp_total_opening_fee,
 			max_proportional_opening_fee_ppm_msat: lsp_prop_opening_fee,
-		});
+		};
+		let kind = Some(PaymentKind::Bolt11Jit { lsp_fee_limits });
 		let payment = PaymentDetails {
-			kind: Some(PaymentKind::Bolt11),
+			kind,
 			hash: payment_hash,
 			preimage: None,
 			secret: Some(invoice.payment_secret().clone()),
 			amount_msat,
 			direction: PaymentDirection::Inbound,
 			status: PaymentStatus::Pending,
-			lsp_fee_limits,
 		};
 
 		self.payment_store.insert(payment)?;

src/payment/payment_store.rs

@@ -34,20 +34,11 @@ pub struct PaymentDetails {
 	pub direction: PaymentDirection,
 	/// The status of the payment.
 	pub status: PaymentStatus,
-	/// Limits applying to how much fee we allow an LSP to deduct from the payment amount.
-	///
-	/// This is only `Some` for payments received via a JIT-channel, in which case the first
-	/// inbound payment will pay for the LSP's channel opening fees.
-	///
-	/// See [`LdkChannelConfig::accept_underpaying_htlcs`] for more information.
-	///
-	/// [`LdkChannelConfig::accept_underpaying_htlcs`]: lightning::util::config::ChannelConfig::accept_underpaying_htlcs
-	pub lsp_fee_limits: Option<LSPFeeLimits>,
 }
 
 impl_writeable_tlv_based!(PaymentDetails, {
 	(0, hash, required),
-	(1, lsp_fee_limits, option),
+	// 1 briefly used to be lsp_fee_limits, could probably be reused at some point in the future.
 	(2, preimage, required),
 	(3, kind, option),
 	(4, secret, required),
@@ -97,6 +88,22 @@ pub enum PaymentKind {
 	/// [BOLT 11]: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md
 	// TODO: Bolt11 { invoice: Option<Bolt11Invoice> },
 	Bolt11,
+	/// A [BOLT 11] payment intended to open an [LSPS 2] just-in-time channel.
+	///
+	/// [BOLT 11]: https://github.com/lightning/bolts/blob/master/11-payment-encoding.md
+	/// [LSPS 2]: https://github.com/BitcoinAndLightningLayerSpecs/lsp/blob/main/LSPS2/README.md
+	// TODO: Bolt11Jit { invoice: Option<Bolt11Invoice> },
+	Bolt11Jit {
+		/// Limits applying to how much fee we allow an LSP to deduct from the payment amount.
+		///
+		/// Allowing them to deduct this fee from the first inbound payment will pay for the LSP's
+		/// channel opening fees.
+		///
+		/// See [`LdkChannelConfig::accept_underpaying_htlcs`] for more information.
+		///
+		/// [`LdkChannelConfig::accept_underpaying_htlcs`]: lightning::util::config::ChannelConfig::accept_underpaying_htlcs
+		lsp_fee_limits: LSPFeeLimits,
+	},
 	/// A spontaneous ("keysend") payment.
 	Spontaneous,
 }
@@ -106,7 +113,10 @@ impl_writeable_tlv_based_enum!(PaymentKind,
 	(2, Bolt11) => {
 	// TODO:	(0, invoice, option),
 	},
-	(6, Spontaneous) => {};
+	(4, Bolt11Jit) => {
+		(0, lsp_fee_limits, required),
+	},
+	(8, Spontaneous) => {};
 );
 
 /// Limits applying to how much fee we allow an LSP to deduct from the payment amount.
@@ -137,7 +147,6 @@ pub(crate) struct PaymentDetailsUpdate {
 	pub amount_msat: Option<Option<u64>>,
 	pub direction: Option<PaymentDirection>,
 	pub status: Option<PaymentStatus>,
-	pub lsp_fee_limits: Option<Option<LSPFeeLimits>>,
 }
 
 impl PaymentDetailsUpdate {
@@ -149,7 +158,6 @@ impl PaymentDetailsUpdate {
 			amount_msat: None,
 			direction: None,
 			status: None,
-			lsp_fee_limits: None,
 		}
 	}
 }
@@ -230,10 +238,6 @@ where
 				payment.status = status;
 			}
 
-			if let Some(lsp_fee_limits) = update.lsp_fee_limits {
-				payment.lsp_fee_limits = lsp_fee_limits
-			}
-
 			self.persist_info(&update.hash, payment)?;
 			updated = true;
 		}

src/payment/spontaneous.rs

@@ -84,7 +84,6 @@ impl SpontaneousPayment {
 					status: PaymentStatus::Pending,
 					direction: PaymentDirection::Outbound,
 					amount_msat: Some(amount_msat),
-					lsp_fee_limits: None,
 				};
 				self.payment_store.insert(payment)?;
 
@@ -104,7 +103,6 @@ impl SpontaneousPayment {
 							status: PaymentStatus::Failed,
 							direction: PaymentDirection::Outbound,
 							amount_msat: Some(amount_msat),
-							lsp_fee_limits: None,
 						};
 
 						self.payment_store.insert(payment)?;

src/uniffi_types.rs

@@ -1,4 +1,6 @@
-pub use crate::payment::payment_store::{LSPFeeLimits, PaymentDirection, PaymentStatus, PaymentKind};
+pub use crate::payment::payment_store::{
+	LSPFeeLimits, PaymentDirection, PaymentKind, PaymentStatus,
+};
 
 pub use lightning::events::{ClosureReason, PaymentFailureReason};
 pub use lightning::ln::{ChannelId, PaymentHash, PaymentPreimage, PaymentSecret};