Test htlc outputs single tx claim due to timeout case

Author: Antoine Riard

src/ln/channelmanager.rs

@@ -3557,6 +3557,77 @@ mod tests {
 		assert_eq!(nodes[1].node.list_channels().len(), 0);
 	}
 
+	#[test]
+	fn claim_htlc_outputs_single_tx() {
+		// Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
+		let nodes = create_network(2);
+
+		let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
+
+		// Rebalance the network to generate htlc in the two directions
+		send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
+		// node[0] is gonna to revoke an old state thus node[1] should be able to claim both offered/received HTLC outputs on top of commitment tx, but this
+		// time as two different claim transactions as we're gonna to timeout htlc with given a high current height
+		let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
+		let _payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
+
+		// Get the will-be-revoked local txn from node[0]
+		let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
+
+		//Revoke the old state
+		claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
+
+		{
+			let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
+
+			nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
+
+			nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
+			let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
+			assert_eq!(node_txn.len(), 10); // ChannelManager : 2, ChannelMontitor: 8 (2 revocation htlc tx, 1 local commitment tx + 1 htlc timeout tx) * 2 (block-rescan)
+
+			assert_eq!(node_txn[0], node_txn[6]);
+			assert_eq!(node_txn[1], node_txn[7]);
+			assert_eq!(node_txn[2], node_txn[8]);
+			assert_eq!(node_txn[3], node_txn[9]);
+			assert_eq!(node_txn[2], node_txn[4]); //local commitment tx + htlc timeout tx broadcated by ChannelManger
+			assert_eq!(node_txn[3], node_txn[5]);
+
+			assert_eq!(node_txn[0].input.len(), 1);
+			assert_eq!(node_txn[1].input.len(), 1);
+
+			let mut revoked_tx_map = HashMap::new();
+			revoked_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
+			node_txn[0].verify(&revoked_tx_map).unwrap();
+			node_txn[1].verify(&revoked_tx_map).unwrap();
+
+			let witness_script_1 = node_txn[0].clone().input[0].witness.pop().unwrap();
+			let witness_script_2 = node_txn[1].clone().input[0].witness.pop().unwrap();
+			if witness_script_1.len() > 133 {
+				assert_eq!(witness_script_1.len(), 138);
+				assert_eq!(witness_script_2.len(), 133);
+			} else {
+				assert_eq!(witness_script_1.len(), 133);
+				assert_eq!(witness_script_2.len(), 138);
+			}
+
+			let mut funding_tx_map = HashMap::new();
+			funding_tx_map.insert(chan_1.3.txid(), chan_1.3.clone());
+			node_txn[2].verify(&funding_tx_map).unwrap();
+			assert_eq!(node_txn[2].input.len(), 1);
+
+			assert_eq!(node_txn[3].input.len(), 1);
+			let witness_script = node_txn[3].clone().input[0].witness.pop().unwrap();
+			assert_eq!(witness_script.len(), 133); //Spending an offered htlc output
+			assert_eq!(node_txn[3].input[0].previous_output.txid, node_txn[2].txid());
+			assert_ne!(node_txn[3].input[0].previous_output.txid, node_txn[0].input[0].previous_output.txid);
+			assert_ne!(node_txn[3].input[0].previous_output.txid, node_txn[1].input[0].previous_output.txid);
+		}
+		get_announce_close_broadcast_events(&nodes, 0, 1);
+		assert_eq!(nodes[0].node.list_channels().len(), 0);
+		assert_eq!(nodes[1].node.list_channels().len(), 0);
+	}
+
 	#[test]
 	fn test_htlc_ignore_latest_remote_commitment() {
 		// Test that HTLC transactions spending the latest remote commitment transaction are simply

src/ln/channelmonitor.rs

@@ -856,7 +856,7 @@ impl ChannelMonitor {
 						};
 						let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
 						sign_input!(sighash_parts, single_htlc_tx.input[0], Some(idx), htlc.amount_msat / 1000);
-						txn_to_broadcast.push(single_htlc_tx); // TODO: This is not yet tested in ChannelManager!
+						txn_to_broadcast.push(single_htlc_tx);
 					}
 				}
 			}