f - fallback to one-hop path

Author: jkczyz

lightning/src/onion_message/messenger.rs

@@ -350,7 +350,7 @@ where
 		const MIN_PEER_CHANNELS: usize = 3;
 
 		let network_graph = self.network_graph.deref().read_only();
-		peers.into_iter()
+		let paths = peers.into_iter()
 			// Limit to peers with announced channels
 			.filter(|pubkey|
 				network_graph
@@ -362,7 +362,15 @@ where
 			.map(|pubkey| vec![pubkey, recipient])
 			.map(|node_pks| BlindedPath::new_for_message(&node_pks, entropy_source, secp_ctx))
 			.take(MAX_PATHS)
-			.collect()
+			.collect::<Result<Vec<_>, _>>();
+
+		match paths {
+			Ok(paths) if !paths.is_empty() => Ok(paths),
+			_ => {
+				BlindedPath::one_hop_for_message(recipient, entropy_source, secp_ctx)
+					.map(|path| vec![path])
+			},
+		}
 	}
 }