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