_ Git - rust-lightning/blob - lightning/src/ln/payment_tests.rs

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Tests that test the payment retry logic in ChannelManager, including various edge-cases around
  11 //! serialization ordering between ChannelManager/ChannelMonitors and ensuring we can still retry
  12 //! payments thereafter.
  13
  14 use chain::{ChannelMonitorUpdateErr, Confirm, Listen, Watch};
  15 use chain::channelmonitor::{ANTI_REORG_DELAY, ChannelMonitor, LATENCY_GRACE_PERIOD_BLOCKS};
  16 use chain::transaction::OutPoint;
  17 use chain::keysinterface::KeysInterface;
  18 use ln::channelmanager::{BREAKDOWN_TIMEOUT, ChannelManager, ChannelManagerReadArgs, PaymentId, PaymentSendFailure};
  19 use ln::features::{InitFeatures, InvoiceFeatures};
  20 use ln::msgs;
  21 use ln::msgs::ChannelMessageHandler;
  22 use routing::router::{PaymentParameters, get_route};
  23 use util::events::{ClosureReason, Event, MessageSendEvent, MessageSendEventsProvider};
  24 use util::test_utils;
  25 use util::errors::APIError;
  26 use util::enforcing_trait_impls::EnforcingSigner;
  27 use util::ser::{ReadableArgs, Writeable};
  28 use io;
  29
  30 use bitcoin::{Block, BlockHeader, BlockHash};
  31 use bitcoin::network::constants::Network;
  32
  33 use prelude::*;
  34
  35 use ln::functional_test_utils::*;
  36
  37 #[test]
  38 fn retry_single_path_payment() {
  39         let chanmon_cfgs = create_chanmon_cfgs(3);
  40         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
  41         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
  42         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
  43
  44         let _chan_0 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
  45         let _chan_1 = create_announced_chan_between_nodes(&nodes, 2, 1, InitFeatures::known(), InitFeatures::known());
  46         // Rebalance to find a route
  47         send_payment(&nodes[2], &vec!(&nodes[1])[..], 3_000_000);
  48
  49         let (route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 100_000);
  50
  51         // Rebalance so that the first hop fails.
  52         send_payment(&nodes[1], &vec!(&nodes[2])[..], 2_000_000);
  53
  54         // Make sure the payment fails on the first hop.
  55         let payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
  56         check_added_monitors!(nodes[0], 1);
  57         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
  58         assert_eq!(events.len(), 1);
  59         let mut payment_event = SendEvent::from_event(events.pop().unwrap());
  60         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
  61         check_added_monitors!(nodes[1], 0);
  62         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
  63         expect_pending_htlcs_forwardable!(nodes[1]);
  64         expect_pending_htlcs_forwardable!(&nodes[1]);
  65         let htlc_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
  66         assert!(htlc_updates.update_add_htlcs.is_empty());
  67         assert_eq!(htlc_updates.update_fail_htlcs.len(), 1);
  68         assert!(htlc_updates.update_fulfill_htlcs.is_empty());
  69         assert!(htlc_updates.update_fail_malformed_htlcs.is_empty());
  70         check_added_monitors!(nodes[1], 1);
  71         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]);
  72         commitment_signed_dance!(nodes[0], nodes[1], htlc_updates.commitment_signed, false);
  73         expect_payment_failed_conditions!(nodes[0], payment_hash, false, PaymentFailedConditions::new().mpp_parts_remain());
  74
  75         // Rebalance the channel so the retry succeeds.
  76         send_payment(&nodes[2], &vec!(&nodes[1])[..], 3_000_000);
  77
  78         // Mine two blocks (we expire retries after 3, so this will check that we don't expire early)
  79         connect_blocks(&nodes[0], 2);
  80
  81         // Retry the payment and make sure it succeeds.
  82         nodes[0].node.retry_payment(&route, payment_id).unwrap();
  83         check_added_monitors!(nodes[0], 1);
  84         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
  85         assert_eq!(events.len(), 1);
  86         pass_along_path(&nodes[0], &[&nodes[1], &nodes[2]], 100_000, payment_hash, Some(payment_secret), events.pop().unwrap(), true, None);
  87         claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], false, payment_preimage);
  88 }
  89
  90 #[test]
  91 fn mpp_failure() {
  92         let chanmon_cfgs = create_chanmon_cfgs(4);
  93         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
  94         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
  95         let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
  96
  97         let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
  98         let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
  99         let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 100         let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 101
 102         let (mut route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(&nodes[0], nodes[3], 100000);
 103         let path = route.paths[0].clone();
 104         route.paths.push(path);
 105         route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
 106         route.paths[0][0].short_channel_id = chan_1_id;
 107         route.paths[0][1].short_channel_id = chan_3_id;
 108         route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
 109         route.paths[1][0].short_channel_id = chan_2_id;
 110         route.paths[1][1].short_channel_id = chan_4_id;
 111         send_along_route_with_secret(&nodes[0], route, &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], 200_000, payment_hash, payment_secret);
 112         fail_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_hash);
 113 }
 114
 115 #[test]
 116 fn mpp_retry() {
 117         let chanmon_cfgs = create_chanmon_cfgs(4);
 118         let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
 119         let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
 120         let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
 121
 122         let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 123         let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 124         let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 125         let chan_4_id = create_announced_chan_between_nodes(&nodes, 3, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
 126         // Rebalance
 127         send_payment(&nodes[3], &vec!(&nodes[2])[..], 1_500_000);
 128
 129         let (mut route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[3], 1_000_000);
 130         let path = route.paths[0].clone();
 131         route.paths.push(path);
 132         route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
 133         route.paths[0][0].short_channel_id = chan_1_id;
 134         route.paths[0][1].short_channel_id = chan_3_id;
 135         route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
 136         route.paths[1][0].short_channel_id = chan_2_id;
 137         route.paths[1][1].short_channel_id = chan_4_id;
 138
 139         // Initiate the MPP payment.
 140         let payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
 141         check_added_monitors!(nodes[0], 2); // one monitor per path
 142         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 143         assert_eq!(events.len(), 2);
 144
 145         // Pass half of the payment along the success path.
 146         let success_path_msgs = events.remove(0);
 147         pass_along_path(&nodes[0], &[&nodes[1], &nodes[3]], 2_000_000, payment_hash, Some(payment_secret), success_path_msgs, false, None);
 148
 149         // Add the HTLC along the first hop.
 150         let fail_path_msgs_1 = events.remove(0);
 151         let (update_add, commitment_signed) = match fail_path_msgs_1 {
 152                 MessageSendEvent::UpdateHTLCs { node_id: _, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
 153                         assert_eq!(update_add_htlcs.len(), 1);
 154                         assert!(update_fail_htlcs.is_empty());
 155                         assert!(update_fulfill_htlcs.is_empty());
 156                         assert!(update_fail_malformed_htlcs.is_empty());
 157                         assert!(update_fee.is_none());
 158                         (update_add_htlcs[0].clone(), commitment_signed.clone())
 159                 },
 160                 _ => panic!("Unexpected event"),
 161         };
 162         nodes[2].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &update_add);
 163         commitment_signed_dance!(nodes[2], nodes[0], commitment_signed, false);
 164
 165         // Attempt to forward the payment and complete the 2nd path's failure.
 166         expect_pending_htlcs_forwardable!(&nodes[2]);
 167         expect_pending_htlcs_forwardable!(&nodes[2]);
 168         let htlc_updates = get_htlc_update_msgs!(nodes[2], nodes[0].node.get_our_node_id());
 169         assert!(htlc_updates.update_add_htlcs.is_empty());
 170         assert_eq!(htlc_updates.update_fail_htlcs.len(), 1);
 171         assert!(htlc_updates.update_fulfill_htlcs.is_empty());
 172         assert!(htlc_updates.update_fail_malformed_htlcs.is_empty());
 173         check_added_monitors!(nodes[2], 1);
 174         nodes[0].node.handle_update_fail_htlc(&nodes[2].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]);
 175         commitment_signed_dance!(nodes[0], nodes[2], htlc_updates.commitment_signed, false);
 176         expect_payment_failed_conditions!(nodes[0], payment_hash, false, PaymentFailedConditions::new().mpp_parts_remain());
 177
 178         // Rebalance the channel so the second half of the payment can succeed.
 179         send_payment(&nodes[3], &vec!(&nodes[2])[..], 1_500_000);
 180
 181         // Make sure it errors as expected given a too-large amount.
 182         if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = nodes[0].node.retry_payment(&route, payment_id) {
 183                 assert!(err.contains("over total_payment_amt_msat"));
 184         } else { panic!("Unexpected error"); }
 185
 186         // Make sure it errors as expected given the wrong payment_id.
 187         if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = nodes[0].node.retry_payment(&route, PaymentId([0; 32])) {
 188                 assert!(err.contains("not found"));
 189         } else { panic!("Unexpected error"); }
 190
 191         // Retry the second half of the payment and make sure it succeeds.
 192         let mut path = route.clone();
 193         path.paths.remove(0);
 194         nodes[0].node.retry_payment(&path, payment_id).unwrap();
 195         check_added_monitors!(nodes[0], 1);
 196         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 197         assert_eq!(events.len(), 1);
 198         pass_along_path(&nodes[0], &[&nodes[2], &nodes[3]], 2_000_000, payment_hash, Some(payment_secret), events.pop().unwrap(), true, None);
 199         claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[3]], &[&nodes[2], &nodes[3]]], false, payment_preimage);
 200 }
 201
 202 #[test]
 203 fn retry_expired_payment() {
 204         let chanmon_cfgs = create_chanmon_cfgs(3);
 205         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 206         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 207         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 208
 209         let _chan_0 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 210         let _chan_1 = create_announced_chan_between_nodes(&nodes, 2, 1, InitFeatures::known(), InitFeatures::known());
 211         // Rebalance to find a route
 212         send_payment(&nodes[2], &vec!(&nodes[1])[..], 3_000_000);
 213
 214         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 100_000);
 215
 216         // Rebalance so that the first hop fails.
 217         send_payment(&nodes[1], &vec!(&nodes[2])[..], 2_000_000);
 218
 219         // Make sure the payment fails on the first hop.
 220         let payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
 221         check_added_monitors!(nodes[0], 1);
 222         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 223         assert_eq!(events.len(), 1);
 224         let mut payment_event = SendEvent::from_event(events.pop().unwrap());
 225         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 226         check_added_monitors!(nodes[1], 0);
 227         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
 228         expect_pending_htlcs_forwardable!(nodes[1]);
 229         expect_pending_htlcs_forwardable!(&nodes[1]);
 230         let htlc_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 231         assert!(htlc_updates.update_add_htlcs.is_empty());
 232         assert_eq!(htlc_updates.update_fail_htlcs.len(), 1);
 233         assert!(htlc_updates.update_fulfill_htlcs.is_empty());
 234         assert!(htlc_updates.update_fail_malformed_htlcs.is_empty());
 235         check_added_monitors!(nodes[1], 1);
 236         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]);
 237         commitment_signed_dance!(nodes[0], nodes[1], htlc_updates.commitment_signed, false);
 238         expect_payment_failed!(nodes[0], payment_hash, false);
 239
 240         // Mine blocks so the payment will have expired.
 241         connect_blocks(&nodes[0], 3);
 242
 243         // Retry the payment and make sure it errors as expected.
 244         if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = nodes[0].node.retry_payment(&route, payment_id) {
 245                 assert!(err.contains("not found"));
 246         } else {
 247                 panic!("Unexpected error");
 248         }
 249 }
 250
 251 #[test]
 252 fn no_pending_leak_on_initial_send_failure() {
 253         // In an earlier version of our payment tracking, we'd have a retry entry even when the initial
 254         // HTLC for payment failed to send due to local channel errors (e.g. peer disconnected). In this
 255         // case, the user wouldn't have a PaymentId to retry the payment with, but we'd think we have a
 256         // pending payment forever and never time it out.
 257         // Here we test exactly that - retrying a payment when a peer was disconnected on the first
 258         // try, and then check that no pending payment is being tracked.
 259         let chanmon_cfgs = create_chanmon_cfgs(2);
 260         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 261         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 262         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 263
 264         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 265
 266         let (route, payment_hash, _, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[1], 100_000);
 267
 268         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 269         nodes[1].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 270
 271         unwrap_send_err!(nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)),
 272                 true, APIError::ChannelUnavailable { ref err },
 273                 assert_eq!(err, "Peer for first hop currently disconnected/pending monitor update!"));
 274
 275         assert!(!nodes[0].node.has_pending_payments());
 276 }
 277
 278 fn do_retry_with_no_persist(confirm_before_reload: bool) {
 279         // If we send a pending payment and `send_payment` returns success, we should always either
 280         // return a payment failure event or a payment success event, and on failure the payment should
 281         // be retryable.
 282         //
 283         // In order to do so when the ChannelManager isn't immediately persisted (which is normal - its
 284         // always persisted asynchronously), the ChannelManager has to reload some payment data from
 285         // ChannelMonitor(s) in some cases. This tests that reloading.
 286         //
 287         // `confirm_before_reload` confirms the channel-closing commitment transaction on-chain prior
 288         // to reloading the ChannelManager, increasing test coverage in ChannelMonitor HTLC tracking
 289         // which has separate codepaths for "commitment transaction already confirmed" and not.
 290         let chanmon_cfgs = create_chanmon_cfgs(3);
 291         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
 292         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
 293         let persister: test_utils::TestPersister;
 294         let new_chain_monitor: test_utils::TestChainMonitor;
 295         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
 296         let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
 297
 298         let (_, _, chan_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 299         let (_, _, chan_id_2, _) = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
 300
 301         // Serialize the ChannelManager prior to sending payments
 302         let nodes_0_serialized = nodes[0].node.encode();
 303
 304         // Send two payments - one which will get to nodes[2] and will be claimed, one which we'll time
 305         // out and retry.
 306         let (route, payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(nodes[0], nodes[2], 1_000_000);
 307         let (payment_preimage_1, _, _, payment_id_1) = send_along_route(&nodes[0], route.clone(), &[&nodes[1], &nodes[2]], 1_000_000);
 308         let payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
 309         check_added_monitors!(nodes[0], 1);
 310
 311         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 312         assert_eq!(events.len(), 1);
 313         let payment_event = SendEvent::from_event(events.pop().unwrap());
 314         assert_eq!(payment_event.node_id, nodes[1].node.get_our_node_id());
 315
 316         // We relay the payment to nodes[1] while its disconnected from nodes[2], causing the payment
 317         // to be returned immediately to nodes[0], without having nodes[2] fail the inbound payment
 318         // which would prevent retry.
 319         nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), false);
 320         nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 321
 322         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
 323         commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false, true);
 324         // nodes[1] now immediately fails the HTLC as the next-hop channel is disconnected
 325         let _ = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 326
 327         reconnect_nodes(&nodes[1], &nodes[2], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
 328
 329         let as_commitment_tx = get_local_commitment_txn!(nodes[0], chan_id)[0].clone();
 330         if confirm_before_reload {
 331                 mine_transaction(&nodes[0], &as_commitment_tx);
 332                 nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clear();
 333         }
 334
 335         // The ChannelMonitor should always be the latest version, as we're required to persist it
 336         // during the `commitment_signed_dance!()`.
 337         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
 338         get_monitor!(nodes[0], chan_id).write(&mut chan_0_monitor_serialized).unwrap();
 339
 340         persister = test_utils::TestPersister::new();
 341         let keys_manager = &chanmon_cfgs[0].keys_manager;
 342         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), nodes[0].logger, node_cfgs[0].fee_estimator, &persister, keys_manager);
 343         nodes[0].chain_monitor = &new_chain_monitor;
 344         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
 345         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
 346                 &mut chan_0_monitor_read, keys_manager).unwrap();
 347         assert!(chan_0_monitor_read.is_empty());
 348
 349         let mut nodes_0_read = &nodes_0_serialized[..];
 350         let (_, nodes_0_deserialized_tmp) = {
 351                 let mut channel_monitors = HashMap::new();
 352                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
 353                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
 354                         default_config: test_default_channel_config(),
 355                         keys_manager,
 356                         fee_estimator: node_cfgs[0].fee_estimator,
 357                         chain_monitor: nodes[0].chain_monitor,
 358                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
 359                         logger: nodes[0].logger,
 360                         channel_monitors,
 361                 }).unwrap()
 362         };
 363         nodes_0_deserialized = nodes_0_deserialized_tmp;
 364         assert!(nodes_0_read.is_empty());
 365
 366         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
 367         nodes[0].node = &nodes_0_deserialized;
 368         check_added_monitors!(nodes[0], 1);
 369
 370         // On reload, the ChannelManager should realize it is stale compared to the ChannelMonitor and
 371         // force-close the channel.
 372         check_closed_event!(nodes[0], 1, ClosureReason::OutdatedChannelManager);
 373         assert!(nodes[0].node.list_channels().is_empty());
 374         assert!(nodes[0].node.has_pending_payments());
 375         let as_broadcasted_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
 376         assert_eq!(as_broadcasted_txn.len(), 1);
 377         assert_eq!(as_broadcasted_txn[0], as_commitment_tx);
 378
 379         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
 380         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: InitFeatures::known()});
 381         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 382
 383         // Now nodes[1] should send a channel reestablish, which nodes[0] will respond to with an
 384         // error, as the channel has hit the chain.
 385         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: InitFeatures::known()});
 386         let bs_reestablish = get_event_msg!(nodes[1], MessageSendEvent::SendChannelReestablish, nodes[0].node.get_our_node_id());
 387         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
 388         let as_err = nodes[0].node.get_and_clear_pending_msg_events();
 389         assert_eq!(as_err.len(), 1);
 390         match as_err[0] {
 391                 MessageSendEvent::HandleError { node_id, action: msgs::ErrorAction::SendErrorMessage { ref msg } } => {
 392                         assert_eq!(node_id, nodes[1].node.get_our_node_id());
 393                         nodes[1].node.handle_error(&nodes[0].node.get_our_node_id(), msg);
 394                         check_closed_event!(nodes[1], 1, ClosureReason::CounterpartyForceClosed { peer_msg: "Failed to find corresponding channel".to_string() });
 395                         check_added_monitors!(nodes[1], 1);
 396                         assert_eq!(nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0).len(), 1);
 397                 },
 398                 _ => panic!("Unexpected event"),
 399         }
 400         check_closed_broadcast!(nodes[1], false);
 401
 402         // Now claim the first payment, which should allow nodes[1] to claim the payment on-chain when
 403         // we close in a moment.
 404         nodes[2].node.claim_funds(payment_preimage_1);
 405         check_added_monitors!(nodes[2], 1);
 406         let htlc_fulfill_updates = get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
 407         nodes[1].node.handle_update_fulfill_htlc(&nodes[2].node.get_our_node_id(), &htlc_fulfill_updates.update_fulfill_htlcs[0]);
 408         check_added_monitors!(nodes[1], 1);
 409         commitment_signed_dance!(nodes[1], nodes[2], htlc_fulfill_updates.commitment_signed, false);
 410
 411         if confirm_before_reload {
 412                 let best_block = nodes[0].blocks.lock().unwrap().last().unwrap().clone();
 413                 nodes[0].node.best_block_updated(&best_block.0, best_block.1);
 414         }
 415
 416         // Create a new channel on which to retry the payment before we fail the payment via the
 417         // HTLC-Timeout transaction. This avoids ChannelManager timing out the payment due to us
 418         // connecting several blocks while creating the channel (implying time has passed).
 419         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 420         assert_eq!(nodes[0].node.list_usable_channels().len(), 1);
 421
 422         mine_transaction(&nodes[1], &as_commitment_tx);
 423         let bs_htlc_claim_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
 424         assert_eq!(bs_htlc_claim_txn.len(), 1);
 425         check_spends!(bs_htlc_claim_txn[0], as_commitment_tx);
 426         expect_payment_forwarded!(nodes[1], None, false);
 427
 428         if !confirm_before_reload {
 429                 mine_transaction(&nodes[0], &as_commitment_tx);
 430         }
 431         mine_transaction(&nodes[0], &bs_htlc_claim_txn[0]);
 432         expect_payment_sent!(nodes[0], payment_preimage_1);
 433         connect_blocks(&nodes[0], TEST_FINAL_CLTV*4 + 20);
 434         let as_htlc_timeout_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
 435         check_spends!(as_htlc_timeout_txn[2], funding_tx);
 436         check_spends!(as_htlc_timeout_txn[0], as_commitment_tx);
 437         check_spends!(as_htlc_timeout_txn[1], as_commitment_tx);
 438         assert_eq!(as_htlc_timeout_txn.len(), 3);
 439         if as_htlc_timeout_txn[0].input[0].previous_output == bs_htlc_claim_txn[0].input[0].previous_output {
 440                 confirm_transaction(&nodes[0], &as_htlc_timeout_txn[1]);
 441         } else {
 442                 confirm_transaction(&nodes[0], &as_htlc_timeout_txn[0]);
 443         }
 444         nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clear();
 445         expect_payment_failed_conditions!(nodes[0], payment_hash, false, PaymentFailedConditions::new().mpp_parts_remain());
 446
 447         // Finally, retry the payment (which was reloaded from the ChannelMonitor when nodes[0] was
 448         // reloaded) via a route over the new channel, which work without issue and eventually be
 449         // received and claimed at the recipient just like any other payment.
 450         let (mut new_route, _, _, _) = get_route_and_payment_hash!(nodes[0], nodes[2], 1_000_000);
 451
 452         // Update the fee on the middle hop to ensure PaymentSent events have the correct (retried) fee
 453         // and not the original fee. We also update node[1]'s relevant config as
 454         // do_claim_payment_along_route expects us to never overpay.
 455         nodes[1].node.channel_state.lock().unwrap().by_id.get_mut(&chan_id_2).unwrap().config.forwarding_fee_base_msat += 100_000;
 456         new_route.paths[0][0].fee_msat += 100_000;
 457
 458         assert!(nodes[0].node.retry_payment(&new_route, payment_id_1).is_err()); // Shouldn't be allowed to retry a fulfilled payment
 459         nodes[0].node.retry_payment(&new_route, payment_id).unwrap();
 460         check_added_monitors!(nodes[0], 1);
 461         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 462         assert_eq!(events.len(), 1);
 463         pass_along_path(&nodes[0], &[&nodes[1], &nodes[2]], 1_000_000, payment_hash, Some(payment_secret), events.pop().unwrap(), true, None);
 464         do_claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], false, payment_preimage);
 465         expect_payment_sent!(nodes[0], payment_preimage, Some(new_route.paths[0][0].fee_msat));
 466 }
 467
 468 #[test]
 469 fn retry_with_no_persist() {
 470         do_retry_with_no_persist(true);
 471         do_retry_with_no_persist(false);
 472 }
 473
 474 fn do_test_dup_htlc_onchain_fails_on_reload(persist_manager_post_event: bool, confirm_commitment_tx: bool, payment_timeout: bool) {
 475         // When a Channel is closed, any outbound HTLCs which were relayed through it are simply
 476         // dropped when the Channel is. From there, the ChannelManager relies on the ChannelMonitor
 477         // having a copy of the relevant fail-/claim-back data and processes the HTLC fail/claim when
 478         // the ChannelMonitor tells it to.
 479         //
 480         // If, due to an on-chain event, an HTLC is failed/claimed, we should avoid providing the
 481         // ChannelManager the HTLC event until after the monitor is re-persisted. This should prevent a
 482         // duplicate HTLC fail/claim (e.g. via a PaymentPathFailed event).
 483         let chanmon_cfgs = create_chanmon_cfgs(2);
 484         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 485         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 486         let persister: test_utils::TestPersister;
 487         let new_chain_monitor: test_utils::TestChainMonitor;
 488         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
 489         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 490
 491         let (_, _, chan_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 492
 493         // Route a payment, but force-close the channel before the HTLC fulfill message arrives at
 494         // nodes[0].
 495         let (payment_preimage, payment_hash, _) = route_payment(&nodes[0], &[&nodes[1]], 10000000);
 496         nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
 497         check_closed_broadcast!(nodes[0], true);
 498         check_added_monitors!(nodes[0], 1);
 499         check_closed_event!(nodes[0], 1, ClosureReason::HolderForceClosed);
 500
 501         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 502         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
 503
 504         // Connect blocks until the CLTV timeout is up so that we get an HTLC-Timeout transaction
 505         connect_blocks(&nodes[0], TEST_FINAL_CLTV + LATENCY_GRACE_PERIOD_BLOCKS + 1);
 506         let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
 507         assert_eq!(node_txn.len(), 3);
 508         assert_eq!(node_txn[0], node_txn[1]);
 509         check_spends!(node_txn[1], funding_tx);
 510         check_spends!(node_txn[2], node_txn[1]);
 511         let timeout_txn = vec![node_txn[2].clone()];
 512
 513         assert!(nodes[1].node.claim_funds(payment_preimage));
 514         check_added_monitors!(nodes[1], 1);
 515
 516         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 517         connect_block(&nodes[1], &Block { header, txdata: vec![node_txn[1].clone()]});
 518         check_closed_broadcast!(nodes[1], true);
 519         check_added_monitors!(nodes[1], 1);
 520         check_closed_event!(nodes[1], 1, ClosureReason::CommitmentTxConfirmed);
 521         let claim_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0);
 522         assert_eq!(claim_txn.len(), 3);
 523         check_spends!(claim_txn[0], node_txn[1]);
 524         check_spends!(claim_txn[1], funding_tx);
 525         check_spends!(claim_txn[2], claim_txn[1]);
 526
 527         header.prev_blockhash = nodes[0].best_block_hash();
 528         connect_block(&nodes[0], &Block { header, txdata: vec![node_txn[1].clone()]});
 529
 530         if confirm_commitment_tx {
 531                 connect_blocks(&nodes[0], BREAKDOWN_TIMEOUT as u32 - 1);
 532         }
 533
 534         header.prev_blockhash = nodes[0].best_block_hash();
 535         let claim_block = Block { header, txdata: if payment_timeout { timeout_txn } else { vec![claim_txn[0].clone()] } };
 536
 537         if payment_timeout {
 538                 assert!(confirm_commitment_tx); // Otherwise we're spending below our CSV!
 539                 connect_block(&nodes[0], &claim_block);
 540                 connect_blocks(&nodes[0], ANTI_REORG_DELAY - 2);
 541         }
 542
 543         // Now connect the HTLC claim transaction with the ChainMonitor-generated ChannelMonitor update
 544         // returning TemporaryFailure. This should cause the claim event to never make its way to the
 545         // ChannelManager.
 546         chanmon_cfgs[0].persister.chain_sync_monitor_persistences.lock().unwrap().clear();
 547         chanmon_cfgs[0].persister.set_update_ret(Err(ChannelMonitorUpdateErr::TemporaryFailure));
 548
 549         if payment_timeout {
 550                 connect_blocks(&nodes[0], 1);
 551         } else {
 552                 connect_block(&nodes[0], &claim_block);
 553         }
 554
 555         let funding_txo = OutPoint { txid: funding_tx.txid(), index: 0 };
 556         let mon_updates: Vec<_> = chanmon_cfgs[0].persister.chain_sync_monitor_persistences.lock().unwrap()
 557                 .get_mut(&funding_txo).unwrap().drain().collect();
 558         assert_eq!(mon_updates.len(), 1);
 559         assert!(nodes[0].chain_monitor.release_pending_monitor_events().is_empty());
 560         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 561
 562         // If we persist the ChannelManager here, we should get the PaymentSent event after
 563         // deserialization.
 564         let mut chan_manager_serialized = test_utils::TestVecWriter(Vec::new());
 565         if !persist_manager_post_event {
 566                 nodes[0].node.write(&mut chan_manager_serialized).unwrap();
 567         }
 568
 569         // Now persist the ChannelMonitor and inform the ChainMonitor that we're done, generating the
 570         // payment sent event.
 571         chanmon_cfgs[0].persister.set_update_ret(Ok(()));
 572         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
 573         get_monitor!(nodes[0], chan_id).write(&mut chan_0_monitor_serialized).unwrap();
 574         nodes[0].chain_monitor.chain_monitor.channel_monitor_updated(funding_txo, mon_updates[0]).unwrap();
 575         if payment_timeout {
 576                 expect_payment_failed!(nodes[0], payment_hash, true);
 577         } else {
 578                 expect_payment_sent!(nodes[0], payment_preimage);
 579         }
 580
 581         // If we persist the ChannelManager after we get the PaymentSent event, we shouldn't get it
 582         // twice.
 583         if persist_manager_post_event {
 584                 nodes[0].node.write(&mut chan_manager_serialized).unwrap();
 585         }
 586
 587         // Now reload nodes[0]...
 588         persister = test_utils::TestPersister::new();
 589         let keys_manager = &chanmon_cfgs[0].keys_manager;
 590         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[0].chain_source), nodes[0].tx_broadcaster.clone(), nodes[0].logger, node_cfgs[0].fee_estimator, &persister, keys_manager);
 591         nodes[0].chain_monitor = &new_chain_monitor;
 592         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
 593         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
 594                 &mut chan_0_monitor_read, keys_manager).unwrap();
 595         assert!(chan_0_monitor_read.is_empty());
 596
 597         let (_, nodes_0_deserialized_tmp) = {
 598                 let mut channel_monitors = HashMap::new();
 599                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
 600                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>
 601                         ::read(&mut io::Cursor::new(&chan_manager_serialized.0[..]), ChannelManagerReadArgs {
 602                                 default_config: Default::default(),
 603                                 keys_manager,
 604                                 fee_estimator: node_cfgs[0].fee_estimator,
 605                                 chain_monitor: nodes[0].chain_monitor,
 606                                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
 607                                 logger: nodes[0].logger,
 608                                 channel_monitors,
 609                         }).unwrap()
 610         };
 611         nodes_0_deserialized = nodes_0_deserialized_tmp;
 612
 613         assert!(nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
 614         check_added_monitors!(nodes[0], 1);
 615         nodes[0].node = &nodes_0_deserialized;
 616
 617         if persist_manager_post_event {
 618                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 619         } else if payment_timeout {
 620                 expect_payment_failed!(nodes[0], payment_hash, true);
 621         } else {
 622                 expect_payment_sent!(nodes[0], payment_preimage);
 623         }
 624
 625         // Note that if we re-connect the block which exposed nodes[0] to the payment preimage (but
 626         // which the current ChannelMonitor has not seen), the ChannelManager's de-duplication of
 627         // payment events should kick in, leaving us with no pending events here.
 628         let height = nodes[0].blocks.lock().unwrap().len() as u32 - 1;
 629         nodes[0].chain_monitor.chain_monitor.block_connected(&claim_block, height);
 630         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 631 }
 632
 633 #[test]
 634 fn test_dup_htlc_onchain_fails_on_reload() {
 635         do_test_dup_htlc_onchain_fails_on_reload(true, true, true);
 636         do_test_dup_htlc_onchain_fails_on_reload(true, true, false);
 637         do_test_dup_htlc_onchain_fails_on_reload(true, false, false);
 638         do_test_dup_htlc_onchain_fails_on_reload(false, true, true);
 639         do_test_dup_htlc_onchain_fails_on_reload(false, true, false);
 640         do_test_dup_htlc_onchain_fails_on_reload(false, false, false);
 641 }
 642
 643 #[test]
 644 fn test_fulfill_restart_failure() {
 645         // When we receive an update_fulfill_htlc message, we immediately consider the HTLC fully
 646         // fulfilled. At this point, the peer can reconnect and decide to either fulfill the HTLC
 647         // again, or fail it, giving us free money.
 648         //
 649         // Of course probably they won't fail it and give us free money, but because we have code to
 650         // handle it, we should test the logic for it anyway. We do that here.
 651         let chanmon_cfgs = create_chanmon_cfgs(2);
 652         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 653         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 654         let persister: test_utils::TestPersister;
 655         let new_chain_monitor: test_utils::TestChainMonitor;
 656         let nodes_1_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
 657         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 658
 659         let chan_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).2;
 660         let (payment_preimage, payment_hash, _) = route_payment(&nodes[0], &[&nodes[1]], 100_000);
 661
 662         // The simplest way to get a failure after a fulfill is to reload nodes[1] from a state
 663         // pre-fulfill, which we do by serializing it here.
 664         let mut chan_manager_serialized = test_utils::TestVecWriter(Vec::new());
 665         nodes[1].node.write(&mut chan_manager_serialized).unwrap();
 666         let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
 667         get_monitor!(nodes[1], chan_id).write(&mut chan_0_monitor_serialized).unwrap();
 668
 669         nodes[1].node.claim_funds(payment_preimage);
 670         check_added_monitors!(nodes[1], 1);
 671         let htlc_fulfill_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 672         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &htlc_fulfill_updates.update_fulfill_htlcs[0]);
 673         expect_payment_sent_without_paths!(nodes[0], payment_preimage);
 674
 675         // Now reload nodes[1]...
 676         persister = test_utils::TestPersister::new();
 677         let keys_manager = &chanmon_cfgs[1].keys_manager;
 678         new_chain_monitor = test_utils::TestChainMonitor::new(Some(nodes[1].chain_source), nodes[1].tx_broadcaster.clone(), nodes[1].logger, node_cfgs[1].fee_estimator, &persister, keys_manager);
 679         nodes[1].chain_monitor = &new_chain_monitor;
 680         let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
 681         let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
 682                 &mut chan_0_monitor_read, keys_manager).unwrap();
 683         assert!(chan_0_monitor_read.is_empty());
 684
 685         let (_, nodes_1_deserialized_tmp) = {
 686                 let mut channel_monitors = HashMap::new();
 687                 channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
 688                 <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>
 689                         ::read(&mut io::Cursor::new(&chan_manager_serialized.0[..]), ChannelManagerReadArgs {
 690                                 default_config: Default::default(),
 691                                 keys_manager,
 692                                 fee_estimator: node_cfgs[1].fee_estimator,
 693                                 chain_monitor: nodes[1].chain_monitor,
 694                                 tx_broadcaster: nodes[1].tx_broadcaster.clone(),
 695                                 logger: nodes[1].logger,
 696                                 channel_monitors,
 697                         }).unwrap()
 698         };
 699         nodes_1_deserialized = nodes_1_deserialized_tmp;
 700
 701         assert!(nodes[1].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0, chan_0_monitor).is_ok());
 702         check_added_monitors!(nodes[1], 1);
 703         nodes[1].node = &nodes_1_deserialized;
 704
 705         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
 706         reconnect_nodes(&nodes[0], &nodes[1], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
 707
 708         nodes[1].node.fail_htlc_backwards(&payment_hash);
 709         expect_pending_htlcs_forwardable!(nodes[1]);
 710         check_added_monitors!(nodes[1], 1);
 711         let htlc_fail_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
 712         nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_fail_updates.update_fail_htlcs[0]);
 713         commitment_signed_dance!(nodes[0], nodes[1], htlc_fail_updates.commitment_signed, false);
 714         // nodes[0] shouldn't generate any events here, while it just got a payment failure completion
 715         // it had already considered the payment fulfilled, and now they just got free money.
 716         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 717 }
 718
 719 #[test]
 720 fn get_ldk_payment_preimage() {
 721         // Ensure that `ChannelManager::get_payment_preimage` can successfully be used to claim a payment.
 722         let chanmon_cfgs = create_chanmon_cfgs(2);
 723         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
 724         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
 725         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
 726         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
 727
 728         let amt_msat = 60_000;
 729         let expiry_secs = 60 * 60;
 730         let (payment_hash, payment_secret) = nodes[1].node.create_inbound_payment(Some(amt_msat), expiry_secs).unwrap();
 731
 732         let payment_params = PaymentParameters::from_node_id(nodes[1].node.get_our_node_id())
 733                 .with_features(InvoiceFeatures::known());
 734         let scorer = test_utils::TestScorer::with_penalty(0);
 735         let keys_manager = test_utils::TestKeysInterface::new(&[0u8; 32], Network::Testnet);
 736         let random_seed_bytes = keys_manager.get_secure_random_bytes();
 737         let route = get_route(
 738                 &nodes[0].node.get_our_node_id(), &payment_params, &nodes[0].network_graph.read_only(),
 739                 Some(&nodes[0].node.list_usable_channels().iter().collect::<Vec<_>>()),
 740                 amt_msat, TEST_FINAL_CLTV, nodes[0].logger, &scorer, &random_seed_bytes).unwrap();
 741         let _payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
 742         check_added_monitors!(nodes[0], 1);
 743
 744         // Make sure to use `get_payment_preimage`
 745         let payment_preimage = nodes[1].node.get_payment_preimage(payment_hash, payment_secret).unwrap();
 746         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
 747         assert_eq!(events.len(), 1);
 748         pass_along_path(&nodes[0], &[&nodes[1]], amt_msat, payment_hash, Some(payment_secret), events.pop().unwrap(), true, Some(payment_preimage));
 749         claim_payment_along_route(&nodes[0], &[&[&nodes[1]]], false, payment_preimage);
 750 }