Add PaymentPurpose::is_keysend utility method

Author: jkczyz

lightning/src/events/mod.rs

@@ -83,6 +83,13 @@ impl PaymentPurpose {
 			PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 		}
 	}
+
+	pub(crate) fn is_keysend(&self) -> bool {
+		match self {
+			PaymentPurpose::Bolt11InvoicePayment { .. } => false,
+			PaymentPurpose::SpontaneousPayment(..) => true,
+		}
+	}
 }
 
 impl_writeable_tlv_based_enum!(PaymentPurpose,

lightning/src/ln/channelmanager.rs

@@ -5431,10 +5431,7 @@ where
 								macro_rules! check_total_value {
 									($purpose: expr) => {{
 										let mut payment_claimable_generated = false;
-										let is_keysend = match $purpose {
-											events::PaymentPurpose::SpontaneousPayment(_) => true,
-											events::PaymentPurpose::Bolt11InvoicePayment { .. } => false,
-										};
+										let is_keysend = $purpose.is_keysend();
 										let mut claimable_payments = self.claimable_payments.lock().unwrap();
 										if claimable_payments.pending_claiming_payments.contains_key(&payment_hash) {
 											fail_htlc!(claimable_htlc, payment_hash);