Penalize failed channels in Scorer

As payments fail, the channel responsible for the failure may be
penalized. Implement Scorer::payment_path_failed to penalize the failed
channel using a configured penalty. As time passes, the penalty is
reduced using exponential decay, though penalties will accumulate if the
channel continues to fail. The decay interval is also configurable.

Author: jkczyz

fuzz/src/full_stack.rs

@@ -382,7 +382,7 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
 	let our_id = PublicKey::from_secret_key(&Secp256k1::signing_only(), &keys_manager.get_node_secret());
 	let network_graph = NetworkGraph::new(genesis_block(network).block_hash());
 	let net_graph_msg_handler = Arc::new(NetGraphMsgHandler::new(network_graph, None, Arc::clone(&logger)));
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 
 	let peers = RefCell::new([false; 256]);
 	let mut loss_detector = MoneyLossDetector::new(&peers, channelmanager.clone(), monitor.clone(), PeerManager::new(MessageHandler {

fuzz/src/router.rs

@@ -248,7 +248,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 						}]));
 					}
 				}
-				let scorer = Scorer::new(0);
+				let scorer = Scorer::with_fixed_penalty(0);
 				for target in node_pks.iter() {
 					let params = RouteParameters {
 						payee: Payee::new(*target).with_route_hints(last_hops.clone()),

lightning-invoice/src/utils.rs

@@ -183,7 +183,7 @@ mod test {
 		let first_hops = nodes[0].node.list_usable_channels();
 		let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
 		let logger = test_utils::TestLogger::new();
-		let scorer = Scorer::new(0);
+		let scorer = Scorer::with_fixed_penalty(0);
 		let route = find_route(
 			&nodes[0].node.get_our_node_id(), &params, network_graph,
 			Some(&first_hops.iter().collect::<Vec<_>>()), &logger, &scorer,

lightning/src/ln/channelmanager.rs

@@ -6279,7 +6279,7 @@ mod tests {
 		let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 		let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 		create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
-		let scorer = Scorer::new(0);
+		let scorer = Scorer::with_fixed_penalty(0);
 
 		// To start (1), send a regular payment but don't claim it.
 		let expected_route = [&nodes[1]];
@@ -6384,7 +6384,7 @@ mod tests {
 		};
 		let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
 		let first_hops = nodes[0].node.list_usable_channels();
-		let scorer = Scorer::new(0);
+		let scorer = Scorer::with_fixed_penalty(0);
 		let route = find_route(
 			&payer_pubkey, &params, network_graph, Some(&first_hops.iter().collect::<Vec<_>>()),
 			nodes[0].logger, &scorer
@@ -6427,7 +6427,7 @@ mod tests {
 		};
 		let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
 		let first_hops = nodes[0].node.list_usable_channels();
-		let scorer = Scorer::new(0);
+		let scorer = Scorer::with_fixed_penalty(0);
 		let route = find_route(
 			&payer_pubkey, &params, network_graph, Some(&first_hops.iter().collect::<Vec<_>>()),
 			nodes[0].logger, &scorer
@@ -6602,7 +6602,7 @@ pub mod bench {
 				let usable_channels = $node_a.list_usable_channels();
 				let payee = Payee::new($node_b.get_our_node_id())
 					.with_features(InvoiceFeatures::known());
-				let scorer = Scorer::new(0);
+				let scorer = Scorer::with_fixed_penalty(0);
 				let route = get_route(&$node_a.get_our_node_id(), &payee, &dummy_graph,
 					Some(&usable_channels.iter().map(|r| r).collect::<Vec<_>>()), 10_000, TEST_FINAL_CLTV, &logger_a, &scorer).unwrap();
 

lightning/src/ln/functional_test_utils.rs

@@ -1015,7 +1015,7 @@ macro_rules! get_route_and_payment_hash {
 			.with_features($crate::ln::features::InvoiceFeatures::known())
 			.with_route_hints($last_hops);
 		let net_graph_msg_handler = &$send_node.net_graph_msg_handler;
-		let scorer = ::routing::scorer::Scorer::new(0);
+		let scorer = ::routing::scorer::Scorer::with_fixed_penalty(0);
 		let route = ::routing::router::get_route(
 			&$send_node.node.get_our_node_id(), &payee, &net_graph_msg_handler.network_graph,
 			Some(&$send_node.node.list_usable_channels().iter().collect::<Vec<_>>()),
@@ -1339,7 +1339,7 @@ pub fn route_payment<'a, 'b, 'c>(origin_node: &Node<'a, 'b, 'c>, expected_route:
 	let payee = Payee::new(expected_route.last().unwrap().node.get_our_node_id())
 		.with_features(InvoiceFeatures::known());
 	let net_graph_msg_handler = &origin_node.net_graph_msg_handler;
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let route = get_route(
 		&origin_node.node.get_our_node_id(), &payee, &net_graph_msg_handler.network_graph,
 		Some(&origin_node.node.list_usable_channels().iter().collect::<Vec<_>>()),
@@ -1358,7 +1358,7 @@ pub fn route_over_limit<'a, 'b, 'c>(origin_node: &Node<'a, 'b, 'c>, expected_rou
 	let payee = Payee::new(expected_route.last().unwrap().node.get_our_node_id())
 		.with_features(InvoiceFeatures::known());
 	let net_graph_msg_handler = &origin_node.net_graph_msg_handler;
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let route = get_route(&origin_node.node.get_our_node_id(), &payee, &net_graph_msg_handler.network_graph, None, recv_value, TEST_FINAL_CLTV, origin_node.logger, &scorer).unwrap();
 	assert_eq!(route.paths.len(), 1);
 	assert_eq!(route.paths[0].len(), expected_route.len());

lightning/src/ln/functional_tests.rs

@@ -7161,7 +7161,7 @@ fn test_check_htlc_underpaying() {
 	// Create some initial channels
 	create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let payee = Payee::new(nodes[1].node.get_our_node_id()).with_features(InvoiceFeatures::known());
 	let route = get_route(&nodes[0].node.get_our_node_id(), &payee, &nodes[0].net_graph_msg_handler.network_graph, None, 10_000, TEST_FINAL_CLTV, nodes[0].logger, &scorer).unwrap();
 	let (_, our_payment_hash, _) = get_payment_preimage_hash!(nodes[0]);
@@ -7561,7 +7561,7 @@ fn test_bump_penalty_txn_on_revoked_htlcs() {
 	let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
 	// Lock HTLC in both directions (using a slightly lower CLTV delay to provide timely RBF bumps)
 	let payee = Payee::new(nodes[1].node.get_our_node_id()).with_features(InvoiceFeatures::known());
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let route = get_route(&nodes[0].node.get_our_node_id(), &payee, &nodes[0].net_graph_msg_handler.network_graph,
 		None, 3_000_000, 50, nodes[0].logger, &scorer).unwrap();
 	let payment_preimage = send_along_route(&nodes[0], route, &[&nodes[1]], 3_000_000).0;
@@ -9061,7 +9061,7 @@ fn test_keysend_payments_to_public_node() {
 		final_value_msat: 10000,
 		final_cltv_expiry_delta: 40,
 	};
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let route = find_route(&payer_pubkey, &params, &network_graph, None, nodes[0].logger, &scorer).unwrap();
 
 	let test_preimage = PaymentPreimage([42; 32]);
@@ -9095,7 +9095,7 @@ fn test_keysend_payments_to_private_node() {
 	};
 	let network_graph = &nodes[0].net_graph_msg_handler.network_graph;
 	let first_hops = nodes[0].node.list_usable_channels();
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 	let route = find_route(
 		&payer_pubkey, &params, &network_graph, Some(&first_hops.iter().collect::<Vec<_>>()),
 		nodes[0].logger, &scorer

lightning/src/ln/shutdown_tests.rs

@@ -82,7 +82,7 @@ fn updates_shutdown_wait() {
 	let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 	let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
 	let logger = test_utils::TestLogger::new();
-	let scorer = Scorer::new(0);
+	let scorer = Scorer::with_fixed_penalty(0);
 
 	let (our_payment_preimage, our_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 100000);