f - fallback to one-hop path

Author: jkczyz

lightning/src/routing/router.rs

@@ -98,7 +98,7 @@ impl<G: Deref<Target = NetworkGraph<L>> + Clone, L: Deref, S: Deref, SP: Sized,
 		const MIN_PEER_CHANNELS: usize = 3;
 
 		let network_graph = self.network_graph.deref().read_only();
-		first_hops.into_iter()
+		let paths = first_hops.into_iter()
 			.filter(|details| details.is_public)
 			.filter(|details| details.counterparty.features.supports_route_blinding())
 			.filter(|details| amount_msats <= details.inbound_capacity_msat)
@@ -132,7 +132,15 @@ impl<G: Deref<Target = NetworkGraph<L>> + Clone, L: Deref, S: Deref, SP: Sized,
 				)
 			})
 			.take(MAX_PAYMENT_PATHS)
-			.collect()
+			.collect::<Result<Vec<_>, _>>();
+
+		match paths {
+			Ok(paths) if !paths.is_empty() => Ok(paths),
+			_ => {
+				BlindedPath::one_hop_for_payment(recipient, tlvs, entropy_source, secp_ctx)
+					.map(|path| vec![path])
+			},
+		}
 	}
 }