Generate a PaymentForwarded event when a forwarded HTLC is claimed
[rust-lightning] / lightning / src / ln / reorg_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 //! Further functional tests which test blockchain reorganizations.
11
12 use chain::channelmonitor::{ANTI_REORG_DELAY, ChannelMonitor};
13 use chain::{Confirm, Watch};
14 use ln::channelmanager::{ChannelManager, ChannelManagerReadArgs};
15 use ln::features::InitFeatures;
16 use ln::msgs::{ChannelMessageHandler, ErrorAction, HTLCFailChannelUpdate};
17 use util::enforcing_trait_impls::EnforcingSigner;
18 use util::events::{Event, MessageSendEvent, MessageSendEventsProvider};
19 use util::test_utils;
20 use util::ser::{ReadableArgs, Writeable};
21
22 use bitcoin::blockdata::block::{Block, BlockHeader};
23 use bitcoin::hash_types::BlockHash;
24
25 use prelude::*;
26 use core::mem;
27
28 use ln::functional_test_utils::*;
29
30 fn do_test_onchain_htlc_reorg(local_commitment: bool, claim: bool) {
31         // Our on-chain HTLC-claim learning has a few properties worth testing:
32         //  * If an upstream HTLC is claimed with a preimage (both against our own commitment
33         //    transaction our counterparty's), we claim it backwards immediately.
34         //  * If an upstream HTLC is claimed with a timeout, we delay ANTI_REORG_DELAY before failing
35         //    it backwards to ensure our counterparty can't claim with a preimage in a reorg.
36         //
37         // Here we test both properties in any combination based on the two bools passed in as
38         // arguments.
39         //
40         // If local_commitment is set, we first broadcast a local commitment containing an offered HTLC
41         // and an HTLC-Timeout tx, otherwise we broadcast a remote commitment containing a received
42         // HTLC and a local HTLC-Timeout tx spending it.
43         //
44         // We then either allow these transactions to confirm (if !claim) or we wait until one block
45         // before they otherwise would and reorg them out, confirming an HTLC-Success tx instead.
46         let chanmon_cfgs = create_chanmon_cfgs(3);
47         let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
48         let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
49         let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
50
51         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
52         let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known());
53
54         // Make sure all nodes are at the same starting height
55         connect_blocks(&nodes[0], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[0].best_block_info().1);
56         connect_blocks(&nodes[1], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[1].best_block_info().1);
57         connect_blocks(&nodes[2], 2*CHAN_CONFIRM_DEPTH + 1 - nodes[2].best_block_info().1);
58
59         let (our_payment_preimage, our_payment_hash, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1000000);
60
61         // Provide preimage to node 2 by claiming payment
62         nodes[2].node.claim_funds(our_payment_preimage);
63         check_added_monitors!(nodes[2], 1);
64         get_htlc_update_msgs!(nodes[2], nodes[1].node.get_our_node_id());
65
66         let mut header = BlockHeader { version: 0x2000_0000, prev_blockhash: nodes[2].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
67         let claim_txn = if local_commitment {
68                 // Broadcast node 1 commitment txn to broadcast the HTLC-Timeout
69                 let node_1_commitment_txn = get_local_commitment_txn!(nodes[1], chan_2.2);
70                 assert_eq!(node_1_commitment_txn.len(), 2); // 1 local commitment tx, 1 Outbound HTLC-Timeout
71                 assert_eq!(node_1_commitment_txn[0].output.len(), 2); // to-self and Offered HTLC (to-remote/to-node-3 is dust)
72                 check_spends!(node_1_commitment_txn[0], chan_2.3);
73                 check_spends!(node_1_commitment_txn[1], node_1_commitment_txn[0]);
74
75                 // Give node 2 node 1's transactions and get its response (claiming the HTLC instead).
76                 connect_block(&nodes[2], &Block { header, txdata: node_1_commitment_txn.clone() });
77                 check_added_monitors!(nodes[2], 1);
78                 check_closed_broadcast!(nodes[2], true); // We should get a BroadcastChannelUpdate (and *only* a BroadcstChannelUpdate)
79                 let node_2_commitment_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
80                 assert_eq!(node_2_commitment_txn.len(), 3); // ChannelMonitor: 1 offered HTLC-Claim, ChannelManger: 1 local commitment tx, 1 Received HTLC-Claim
81                 assert_eq!(node_2_commitment_txn[1].output.len(), 2); // to-remote and Received HTLC (to-self is dust)
82                 check_spends!(node_2_commitment_txn[1], chan_2.3);
83                 check_spends!(node_2_commitment_txn[2], node_2_commitment_txn[1]);
84                 check_spends!(node_2_commitment_txn[0], node_1_commitment_txn[0]);
85
86                 // Make sure node 1's height is the same as the !local_commitment case
87                 connect_blocks(&nodes[1], 1);
88                 // Confirm node 1's commitment txn (and HTLC-Timeout) on node 1
89                 header.prev_blockhash = nodes[1].best_block_hash();
90                 connect_block(&nodes[1], &Block { header, txdata: node_1_commitment_txn.clone() });
91
92                 // ...but return node 1's commitment tx in case claim is set and we're preparing to reorg
93                 vec![node_1_commitment_txn[0].clone(), node_2_commitment_txn[0].clone()]
94         } else {
95                 // Broadcast node 2 commitment txn
96                 let node_2_commitment_txn = get_local_commitment_txn!(nodes[2], chan_2.2);
97                 assert_eq!(node_2_commitment_txn.len(), 2); // 1 local commitment tx, 1 Received HTLC-Claim
98                 assert_eq!(node_2_commitment_txn[0].output.len(), 2); // to-remote and Received HTLC (to-self is dust)
99                 check_spends!(node_2_commitment_txn[0], chan_2.3);
100                 check_spends!(node_2_commitment_txn[1], node_2_commitment_txn[0]);
101
102                 // Give node 1 node 2's commitment transaction and get its response (timing the HTLC out)
103                 mine_transaction(&nodes[1], &node_2_commitment_txn[0]);
104                 connect_blocks(&nodes[1], TEST_FINAL_CLTV - 1); // Confirm blocks until the HTLC expires
105                 let node_1_commitment_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();
106                 assert_eq!(node_1_commitment_txn.len(), 2); // ChannelMonitor: 1 offered HTLC-Timeout, ChannelManger: 1 local commitment tx
107                 assert_eq!(node_1_commitment_txn[0].output.len(), 2); // to-local and Offered HTLC (to-remote is dust)
108                 check_spends!(node_1_commitment_txn[0], chan_2.3);
109                 check_spends!(node_1_commitment_txn[1], node_2_commitment_txn[0]);
110
111                 // Confirm node 2's commitment txn (and node 1's HTLC-Timeout) on node 1
112                 header.prev_blockhash = nodes[1].best_block_hash();
113                 let block = Block { header, txdata: vec![node_2_commitment_txn[0].clone(), node_1_commitment_txn[1].clone()] };
114                 connect_block(&nodes[1], &block);
115                 // ...but return node 2's commitment tx (and claim) in case claim is set and we're preparing to reorg
116                 node_2_commitment_txn
117         };
118         check_added_monitors!(nodes[1], 1);
119         check_closed_broadcast!(nodes[1], true); // We should get a BroadcastChannelUpdate (and *only* a BroadcstChannelUpdate)
120         // Connect ANTI_REORG_DELAY - 2 blocks, giving us a confirmation count of ANTI_REORG_DELAY - 1.
121         connect_blocks(&nodes[1], ANTI_REORG_DELAY - 2);
122         check_added_monitors!(nodes[1], 0);
123         assert_eq!(nodes[1].node.get_and_clear_pending_events().len(), 0);
124
125         if claim {
126                 disconnect_blocks(&nodes[1], ANTI_REORG_DELAY - 2);
127
128                 let block = Block {
129                         header: BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
130                         txdata: claim_txn,
131                 };
132                 connect_block(&nodes[1], &block);
133
134                 // ChannelManager only polls chain::Watch::release_pending_monitor_events when we
135                 // probe it for events, so we probe non-message events here (which should just be the
136                 // PaymentForwarded event).
137                 expect_payment_forwarded!(nodes[1], Some(1000), true);
138         } else {
139                 // Confirm the timeout tx and check that we fail the HTLC backwards
140                 let block = Block {
141                         header: BlockHeader { version: 0x20000000, prev_blockhash: nodes[1].best_block_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
142                         txdata: vec![],
143                 };
144                 connect_block(&nodes[1], &block);
145                 expect_pending_htlcs_forwardable!(nodes[1]);
146         }
147
148         check_added_monitors!(nodes[1], 1);
149         // Which should result in an immediate claim/fail of the HTLC:
150         let htlc_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
151         if claim {
152                 assert_eq!(htlc_updates.update_fulfill_htlcs.len(), 1);
153                 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fulfill_htlcs[0]);
154         } else {
155                 assert_eq!(htlc_updates.update_fail_htlcs.len(), 1);
156                 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]);
157         }
158         commitment_signed_dance!(nodes[0], nodes[1], htlc_updates.commitment_signed, false, true);
159         if claim {
160                 expect_payment_sent!(nodes[0], our_payment_preimage);
161         } else {
162                 let events = nodes[0].node.get_and_clear_pending_msg_events();
163                 assert_eq!(events.len(), 1);
164                 if let MessageSendEvent::PaymentFailureNetworkUpdate { update: HTLCFailChannelUpdate::ChannelClosed { ref is_permanent, .. } } = events[0] {
165                         assert!(is_permanent);
166                 } else { panic!("Unexpected event!"); }
167                 expect_payment_failed!(nodes[0], our_payment_hash, false);
168         }
169 }
170
171 #[test]
172 fn test_onchain_htlc_claim_reorg_local_commitment() {
173         do_test_onchain_htlc_reorg(true, true);
174 }
175 #[test]
176 fn test_onchain_htlc_timeout_delay_local_commitment() {
177         do_test_onchain_htlc_reorg(true, false);
178 }
179 #[test]
180 fn test_onchain_htlc_claim_reorg_remote_commitment() {
181         do_test_onchain_htlc_reorg(false, true);
182 }
183 #[test]
184 fn test_onchain_htlc_timeout_delay_remote_commitment() {
185         do_test_onchain_htlc_reorg(false, false);
186 }
187
188 fn do_test_unconf_chan(reload_node: bool, reorg_after_reload: bool, use_funding_unconfirmed: bool, connect_style: ConnectStyle) {
189         // After creating a chan between nodes, we disconnect all blocks previously seen to force a
190         // channel close on nodes[0] side. We also use this to provide very basic testing of logic
191         // around freeing background events which store monitor updates during block_[dis]connected.
192         let chanmon_cfgs = create_chanmon_cfgs(2);
193         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
194         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
195         let persister: test_utils::TestPersister;
196         let new_chain_monitor: test_utils::TestChainMonitor;
197         let nodes_0_deserialized: ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster, &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>;
198         let mut nodes = create_network(2, &node_cfgs, &node_chanmgrs);
199         *nodes[0].connect_style.borrow_mut() = connect_style;
200
201         let chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
202
203         let channel_state = nodes[0].node.channel_state.lock().unwrap();
204         assert_eq!(channel_state.by_id.len(), 1);
205         assert_eq!(channel_state.short_to_id.len(), 1);
206         mem::drop(channel_state);
207
208         if !reorg_after_reload {
209                 if use_funding_unconfirmed {
210                         let relevant_txids = nodes[0].node.get_relevant_txids();
211                         assert_eq!(&relevant_txids[..], &[chan.3.txid()]);
212                         nodes[0].node.transaction_unconfirmed(&relevant_txids[0]);
213                 } else {
214                         disconnect_all_blocks(&nodes[0]);
215                 }
216                 if connect_style == ConnectStyle::FullBlockViaListen && !use_funding_unconfirmed {
217                         handle_announce_close_broadcast_events(&nodes, 0, 1, true, "Funding transaction was un-confirmed. Locked at 6 confs, now have 2 confs.");
218                 } else {
219                         handle_announce_close_broadcast_events(&nodes, 0, 1, true, "Funding transaction was un-confirmed. Locked at 6 confs, now have 0 confs.");
220                 }
221                 check_added_monitors!(nodes[1], 1);
222                 {
223                         let channel_state = nodes[0].node.channel_state.lock().unwrap();
224                         assert_eq!(channel_state.by_id.len(), 0);
225                         assert_eq!(channel_state.short_to_id.len(), 0);
226                 }
227         }
228
229         if reload_node {
230                 // Since we currently have a background event pending, it's good to test that we survive a
231                 // serialization roundtrip. Further, this tests the somewhat awkward edge-case of dropping
232                 // the Channel object from the ChannelManager, but still having a monitor event pending for
233                 // it when we go to deserialize, and then use the ChannelManager.
234                 let nodes_0_serialized = nodes[0].node.encode();
235                 let mut chan_0_monitor_serialized = test_utils::TestVecWriter(Vec::new());
236                 nodes[0].chain_monitor.chain_monitor.monitors.read().unwrap().iter().next().unwrap().1.write(&mut chan_0_monitor_serialized).unwrap();
237
238                 persister = test_utils::TestPersister::new();
239                 let keys_manager = &chanmon_cfgs[0].keys_manager;
240                 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);
241                 nodes[0].chain_monitor = &new_chain_monitor;
242                 let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
243                 let (_, mut chan_0_monitor) = <(BlockHash, ChannelMonitor<EnforcingSigner>)>::read(
244                         &mut chan_0_monitor_read, keys_manager).unwrap();
245                 assert!(chan_0_monitor_read.is_empty());
246
247                 let mut nodes_0_read = &nodes_0_serialized[..];
248                 nodes_0_deserialized = {
249                         let mut channel_monitors = HashMap::new();
250                         channel_monitors.insert(chan_0_monitor.get_funding_txo().0, &mut chan_0_monitor);
251                         <(BlockHash, ChannelManager<EnforcingSigner, &test_utils::TestChainMonitor, &test_utils::TestBroadcaster,
252                           &test_utils::TestKeysInterface, &test_utils::TestFeeEstimator, &test_utils::TestLogger>)>::read(
253                                 &mut nodes_0_read, ChannelManagerReadArgs {
254                                         default_config: *nodes[0].node.get_current_default_configuration(),
255                                         keys_manager,
256                                         fee_estimator: node_cfgs[0].fee_estimator,
257                                         chain_monitor: nodes[0].chain_monitor,
258                                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
259                                         logger: nodes[0].logger,
260                                         channel_monitors,
261                         }).unwrap().1
262                 };
263                 nodes[0].node = &nodes_0_deserialized;
264                 assert!(nodes_0_read.is_empty());
265                 if !reorg_after_reload {
266                         // If the channel is already closed when we reload the node, we'll broadcast a closing
267                         // transaction via the ChannelMonitor which is missing a corresponding channel.
268                         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
269                         nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clear();
270                 }
271
272                 nodes[0].chain_monitor.watch_channel(chan_0_monitor.get_funding_txo().0.clone(), chan_0_monitor).unwrap();
273                 check_added_monitors!(nodes[0], 1);
274         }
275
276         if reorg_after_reload {
277                 if use_funding_unconfirmed {
278                         let relevant_txids = nodes[0].node.get_relevant_txids();
279                         assert_eq!(&relevant_txids[..], &[chan.3.txid()]);
280                         nodes[0].node.transaction_unconfirmed(&relevant_txids[0]);
281                 } else {
282                         disconnect_all_blocks(&nodes[0]);
283                 }
284                 if connect_style == ConnectStyle::FullBlockViaListen && !use_funding_unconfirmed {
285                         handle_announce_close_broadcast_events(&nodes, 0, 1, true, "Funding transaction was un-confirmed. Locked at 6 confs, now have 2 confs.");
286                 } else {
287                         handle_announce_close_broadcast_events(&nodes, 0, 1, true, "Funding transaction was un-confirmed. Locked at 6 confs, now have 0 confs.");
288                 }
289                 check_added_monitors!(nodes[1], 1);
290                 {
291                         let channel_state = nodes[0].node.channel_state.lock().unwrap();
292                         assert_eq!(channel_state.by_id.len(), 0);
293                         assert_eq!(channel_state.short_to_id.len(), 0);
294                 }
295         }
296         // With expect_channel_force_closed set the TestChainMonitor will enforce that the next update
297         // is a ChannelForcClosed on the right channel with should_broadcast set.
298         *nodes[0].chain_monitor.expect_channel_force_closed.lock().unwrap() = Some((chan.2, true));
299         nodes[0].node.test_process_background_events(); // Required to free the pending background monitor update
300         check_added_monitors!(nodes[0], 1);
301         assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().len(), 1);
302         nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().clear();
303
304         // Now check that we can create a new channel
305         create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
306         send_payment(&nodes[0], &[&nodes[1]], 8000000);
307 }
308
309 #[test]
310 fn test_unconf_chan() {
311         do_test_unconf_chan(true, true, false, ConnectStyle::BestBlockFirstSkippingBlocks);
312         do_test_unconf_chan(false, true, false, ConnectStyle::BestBlockFirstSkippingBlocks);
313         do_test_unconf_chan(true, false, false, ConnectStyle::BestBlockFirstSkippingBlocks);
314         do_test_unconf_chan(false, false, false, ConnectStyle::BestBlockFirstSkippingBlocks);
315 }
316
317 #[test]
318 fn test_unconf_chan_via_listen() {
319         do_test_unconf_chan(true, true, false, ConnectStyle::FullBlockViaListen);
320         do_test_unconf_chan(false, true, false, ConnectStyle::FullBlockViaListen);
321         do_test_unconf_chan(true, false, false, ConnectStyle::FullBlockViaListen);
322         do_test_unconf_chan(false, false, false, ConnectStyle::FullBlockViaListen);
323 }
324
325 #[test]
326 fn test_unconf_chan_via_funding_unconfirmed() {
327         do_test_unconf_chan(true, true, true, ConnectStyle::BestBlockFirstSkippingBlocks);
328         do_test_unconf_chan(false, true, true, ConnectStyle::BestBlockFirstSkippingBlocks);
329         do_test_unconf_chan(true, false, true, ConnectStyle::BestBlockFirstSkippingBlocks);
330         do_test_unconf_chan(false, false, true, ConnectStyle::BestBlockFirstSkippingBlocks);
331
332         do_test_unconf_chan(true, true, true, ConnectStyle::FullBlockViaListen);
333         do_test_unconf_chan(false, true, true, ConnectStyle::FullBlockViaListen);
334         do_test_unconf_chan(true, false, true, ConnectStyle::FullBlockViaListen);
335         do_test_unconf_chan(false, false, true, ConnectStyle::FullBlockViaListen);
336 }
337
338 #[test]
339 fn test_set_outpoints_partial_claiming() {
340         // - remote party claim tx, new bump tx
341         // - disconnect remote claiming tx, new bump
342         // - disconnect tx, see no tx anymore
343         let chanmon_cfgs = create_chanmon_cfgs(2);
344         let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
345         let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
346         let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
347
348         let chan = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1000000, 59000000, InitFeatures::known(), InitFeatures::known());
349         let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3_000_000).0;
350         let payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3_000_000).0;
351
352         // Remote commitment txn with 4 outputs: to_local, to_remote, 2 outgoing HTLC
353         let remote_txn = get_local_commitment_txn!(nodes[1], chan.2);
354         assert_eq!(remote_txn.len(), 3);
355         assert_eq!(remote_txn[0].output.len(), 4);
356         assert_eq!(remote_txn[0].input.len(), 1);
357         assert_eq!(remote_txn[0].input[0].previous_output.txid, chan.3.txid());
358         check_spends!(remote_txn[1], remote_txn[0]);
359         check_spends!(remote_txn[2], remote_txn[0]);
360
361         // Connect blocks on node A to advance height towards TEST_FINAL_CLTV
362         // Provide node A with both preimage
363         nodes[0].node.claim_funds(payment_preimage_1);
364         nodes[0].node.claim_funds(payment_preimage_2);
365         check_added_monitors!(nodes[0], 2);
366         nodes[0].node.get_and_clear_pending_events();
367         nodes[0].node.get_and_clear_pending_msg_events();
368
369         // Connect blocks on node A commitment transaction
370         mine_transaction(&nodes[0], &remote_txn[0]);
371         check_closed_broadcast!(nodes[0], true);
372         check_added_monitors!(nodes[0], 1);
373         // Verify node A broadcast tx claiming both HTLCs
374         {
375                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
376                 // ChannelMonitor: claim tx, ChannelManager: local commitment tx + HTLC-Success*2
377                 assert_eq!(node_txn.len(), 4);
378                 check_spends!(node_txn[0], remote_txn[0]);
379                 check_spends!(node_txn[1], chan.3);
380                 check_spends!(node_txn[2], node_txn[1]);
381                 check_spends!(node_txn[3], node_txn[1]);
382                 assert_eq!(node_txn[0].input.len(), 2);
383                 node_txn.clear();
384         }
385
386         // Connect blocks on node B
387         connect_blocks(&nodes[1], 135);
388         check_closed_broadcast!(nodes[1], true);
389         check_added_monitors!(nodes[1], 1);
390         // Verify node B broadcast 2 HTLC-timeout txn
391         let partial_claim_tx = {
392                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
393                 assert_eq!(node_txn.len(), 3);
394                 check_spends!(node_txn[1], node_txn[0]);
395                 check_spends!(node_txn[2], node_txn[0]);
396                 assert_eq!(node_txn[1].input.len(), 1);
397                 assert_eq!(node_txn[2].input.len(), 1);
398                 node_txn[1].clone()
399         };
400
401         // Broadcast partial claim on node A, should regenerate a claiming tx with HTLC dropped
402         mine_transaction(&nodes[0], &partial_claim_tx);
403         {
404                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
405                 assert_eq!(node_txn.len(), 1);
406                 check_spends!(node_txn[0], remote_txn[0]);
407                 assert_eq!(node_txn[0].input.len(), 1); //dropped HTLC
408                 node_txn.clear();
409         }
410         nodes[0].node.get_and_clear_pending_msg_events();
411
412         // Disconnect last block on node A, should regenerate a claiming tx with HTLC dropped
413         disconnect_blocks(&nodes[0], 1);
414         {
415                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
416                 assert_eq!(node_txn.len(), 1);
417                 check_spends!(node_txn[0], remote_txn[0]);
418                 assert_eq!(node_txn[0].input.len(), 2); //resurrected HTLC
419                 node_txn.clear();
420         }
421
422         //// Disconnect one more block and then reconnect multiple no transaction should be generated
423         disconnect_blocks(&nodes[0], 1);
424         connect_blocks(&nodes[0], 15);
425         {
426                 let mut node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
427                 assert_eq!(node_txn.len(), 0);
428                 node_txn.clear();
429         }
430 }