f handle trampoline

Author: TheBlueMatt

lightning/src/routing/router.rs

@@ -392,11 +392,15 @@ impl InFlightHtlcs {
 			if tail.hops.len() > 1 {
 				// Single-hop blinded paths aren't really "blinded" paths, as they terminate at the
 				// introduction point. In that case, we don't need to track anything.
-				let last_hop = path.hops.last().unwrap();
-				let intro_node = NodeId::from_pubkey(&last_hop.pubkey);
+				let last_trampoline_hop =
+					tail.trampoline_hops.last().map(|hop| (hop.pubkey, hop.fee_msat));
+				let last_normal_hop = path.hops.last().unwrap();
+				let last_hop = last_trampoline_hop
+					.unwrap_or((last_normal_hop.pubkey, last_normal_hop.fee_msat));
+				let intro_node = NodeId::from_pubkey(&last_hop.0);
 				// The amount we send into the blinded path is the sum of the blinded path final
 				// amount and the fee we pay in it, which is the `fee_msat` of the last hop.
-				let blinded_path_sent_amt = last_hop.fee_msat + cumulative_msat;
+				let blinded_path_sent_amt = last_hop.1 + cumulative_msat;
 				self.blinded_hops
 					.entry((intro_node, tail.blinding_point))
 					.and_modify(|used_liquidity_msat| *used_liquidity_msat += blinded_path_sent_amt)