functional_tests: Add test to check if the node is recovering funds from a revoked state.

Author: Aditya Sharma

lightning/src/ln/functional_tests.rs

@@ -4680,6 +4680,102 @@ macro_rules! check_spendable_outputs {
 	}
 }
 
+#[test]
+fn test_peer_storage_on_revoked_txn() {
+	let chanmon_cfgs = create_chanmon_cfgs(2);
+	let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
+	let (persister, chain_monitor);
+	let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
+	let nodes_0_deserialized;
+	let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
+	let nodes_0_serialized = nodes[0].node.encode();
+
+	let (_a, _b, channel_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 1, 0);
+
+	send_payment(&nodes[1], &vec!(&nodes[0])[..], 10000);
+	send_payment(&nodes[1], &vec!(&nodes[0])[..], 10000);
+
+	let revoked_local_txn = get_local_commitment_txn!(nodes[1], channel_id);
+	assert_eq!(revoked_local_txn[0].input.len(), 1);
+	assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, funding_tx.txid());
+
+	send_payment(&nodes[1], &vec!(&nodes[0])[..], 10000);
+
+	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
+	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
+
+	// Lets drop the monitor and clear the chain_monitor as well.
+	nodes[0].chain_source.remove_watched_txn_and_outputs(
+	OutPoint { txid: funding_tx.txid(), index: 0 },
+		funding_tx.output[0].script_pubkey.clone()
+	);
+
+	reload_node_with_stubs!(nodes[0], &nodes_0_serialized, &[], &[], persister, chain_monitor, nodes_0_deserialized);
+
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	let reestablish_1 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
+	assert_eq!(reestablish_1.len(), 1);
+
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
+	let reestablish_2 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
+	assert_eq!(reestablish_2.len(), 0);
+
+	nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_1[0]);
+
+	// Node[0] will generate bogus chennal reestablish and warning so that the peer closes the channel.
+	let mut closing_events = nodes[0].node.get_and_clear_pending_msg_events();
+	assert_eq!(closing_events.len(), 2);
+	let nodes_2_event = remove_first_msg_event_to_node(&nodes[1].node.get_our_node_id(), &mut closing_events);
+	let nodes_0_event = remove_first_msg_event_to_node(&nodes[1].node.get_our_node_id(), &mut closing_events);
+
+	match nodes_2_event {
+		MessageSendEvent::SendChannelReestablish { ref node_id, ref msg  } => {
+			assert_eq!(nodes[1].node.get_our_node_id(), *node_id);
+			nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), msg)
+		},
+		_ => panic!("Unexpected event"),
+	}
+
+	let mut err_msgs_0 = Vec::with_capacity(1);
+	if let MessageSendEvent::HandleError { ref action, .. } = nodes_0_event {
+		match action {
+			&ErrorAction::SendErrorMessage { ref msg } => {
+				assert_eq!(msg.data, format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", &nodes[1].node.get_our_node_id()));
+				err_msgs_0.push(msg.clone());
+			},
+			_ => panic!("Unexpected event!"),
+		}
+	} else {
+		panic!("Unexpected event!");
+	}
+	assert_eq!(err_msgs_0.len(), 1);
+	nodes[1].node.handle_error(&nodes[0].node.get_our_node_id(), &err_msgs_0[0]);
+
+	let block = create_dummy_block(nodes[1].best_block_hash(), 42, vec![revoked_local_txn[0].clone()]);
+	connect_block(&nodes[0], &block);
+	connect_block(&nodes[1], &block);
+	check_closed_broadcast!(nodes[1], true);
+
+	let events_2 = nodes[1].node.get_and_clear_pending_events();
+	assert_eq!(events_2.len(), 1);
+	match events_2[0] {
+		Event::ChannelClosed {..} => {}, // If we actually processed we'd receive the payment
+		_ => panic!("Unexpected event"),
+	}
+	check_added_monitors!(nodes[1], 1);
+	let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
+	assert_eq!(node_txn.len(), 1);
+	assert_eq!(node_txn[0].input.len(), 1);
+
+	let block = create_dummy_block(nodes[1].best_block_hash(), 42, vec![node_txn[0].clone()]);
+	connect_block(&nodes[0], &block);
+	connect_block(&nodes[1], &block);
+}
+
 #[test]
 fn test_claim_sizeable_push_msat() {
 	// Incidentally test SpendableOutput event generation due to detection of to_local output on commitment tx