1 //! Utilities that take care of tasks that (1) need to happen periodically to keep Rust-Lightning
2 //! running properly, and (2) either can or should be run in the background. See docs for
3 //! [`BackgroundProcessor`] for more details on the nitty-gritty.
5 #![deny(broken_intra_doc_links)]
9 #[macro_use] extern crate lightning;
12 use lightning::chain::chaininterface::{BroadcasterInterface, FeeEstimator};
13 use lightning::chain::chainmonitor::ChainMonitor;
14 use lightning::chain::channelmonitor;
15 use lightning::chain::keysinterface::{Sign, KeysInterface};
16 use lightning::ln::channelmanager::ChannelManager;
17 use lightning::ln::msgs::{ChannelMessageHandler, RoutingMessageHandler};
18 use lightning::ln::peer_handler::{PeerManager, SocketDescriptor};
19 use lightning::util::events::{EventHandler, EventsProvider};
20 use lightning::util::logger::Logger;
22 use std::sync::atomic::{AtomicBool, Ordering};
24 use std::thread::JoinHandle;
25 use std::time::{Duration, Instant};
28 /// BackgroundProcessor takes care of tasks that (1) need to happen periodically to keep
29 /// Rust-Lightning running properly, and (2) either can or should be run in the background. Its
30 /// responsibilities are:
31 /// * Monitoring whether the ChannelManager needs to be re-persisted to disk, and if so,
32 /// writing it to disk/backups by invoking the callback given to it at startup.
33 /// ChannelManager persistence should be done in the background.
34 /// * Calling `ChannelManager::timer_tick_occurred()` and
35 /// `PeerManager::timer_tick_occurred()` every minute (can be done in the
38 /// Note that if ChannelManager persistence fails and the persisted manager becomes out-of-date,
39 /// then there is a risk of channels force-closing on startup when the manager realizes it's
40 /// outdated. However, as long as `ChannelMonitor` backups are sound, no funds besides those used
41 /// for unilateral chain closure fees are at risk.
42 #[must_use = "BackgroundProcessor will immediately stop on drop. It should be stored until shutdown."]
43 pub struct BackgroundProcessor {
44 stop_thread: Arc<AtomicBool>,
45 thread_handle: Option<JoinHandle<Result<(), std::io::Error>>>,
49 const FRESHNESS_TIMER: u64 = 60;
51 const FRESHNESS_TIMER: u64 = 1;
53 const PING_TIMER: u64 = 5;
55 /// Trait which handles persisting a [`ChannelManager`] to disk.
57 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
58 pub trait ChannelManagerPersister<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
60 M::Target: 'static + chain::Watch<Signer>,
61 T::Target: 'static + BroadcasterInterface,
62 K::Target: 'static + KeysInterface<Signer = Signer>,
63 F::Target: 'static + FeeEstimator,
64 L::Target: 'static + Logger,
66 /// Persist the given [`ChannelManager`] to disk, returning an error if persistence failed
67 /// (which will cause the [`BackgroundProcessor`] which called this method to exit.
69 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
70 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>;
73 impl<Fun, Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
74 ChannelManagerPersister<Signer, M, T, K, F, L> for Fun where
75 M::Target: 'static + chain::Watch<Signer>,
76 T::Target: 'static + BroadcasterInterface,
77 K::Target: 'static + KeysInterface<Signer = Signer>,
78 F::Target: 'static + FeeEstimator,
79 L::Target: 'static + Logger,
80 Fun: Fn(&ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>,
82 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error> {
87 impl BackgroundProcessor {
88 /// Start a background thread that takes care of responsibilities enumerated in the [top-level
91 /// The thread runs indefinitely unless the object is dropped, [`stop`] is called, or
92 /// `persist_manager` returns an error. In case of an error, the error is retrieved by calling
93 /// either [`join`] or [`stop`].
95 /// Typically, users should either implement [`ChannelManagerPersister`] to never return an
96 /// error or call [`join`] and handle any error that may arise. For the latter case, the
97 /// `BackgroundProcessor` must be restarted by calling `start` again after handling the error.
99 /// `persist_manager` is responsible for writing out the [`ChannelManager`] to disk, and/or
100 /// uploading to one or more backup services. See [`ChannelManager::write`] for writing out a
101 /// [`ChannelManager`]. See [`FilesystemPersister::persist_manager`] for Rust-Lightning's
102 /// provided implementation.
104 /// [top-level documentation]: Self
105 /// [`join`]: Self::join
106 /// [`stop`]: Self::stop
107 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
108 /// [`ChannelManager::write`]: lightning::ln::channelmanager::ChannelManager#impl-Writeable
109 /// [`FilesystemPersister::persist_manager`]: lightning_persister::FilesystemPersister::persist_manager
111 Signer: 'static + Sign,
112 CF: 'static + Deref + Send + Sync,
113 CW: 'static + Deref + Send + Sync,
114 T: 'static + Deref + Send + Sync,
115 K: 'static + Deref + Send + Sync,
116 F: 'static + Deref + Send + Sync,
117 L: 'static + Deref + Send + Sync,
118 P: 'static + Deref + Send + Sync,
119 Descriptor: 'static + SocketDescriptor + Send + Sync,
120 CMH: 'static + Deref + Send + Sync,
121 RMH: 'static + Deref + Send + Sync,
122 EH: 'static + EventHandler + Send + Sync,
123 CMP: 'static + Send + ChannelManagerPersister<Signer, CW, T, K, F, L>,
124 M: 'static + Deref<Target = ChainMonitor<Signer, CF, T, F, L, P>> + Send + Sync,
125 CM: 'static + Deref<Target = ChannelManager<Signer, CW, T, K, F, L>> + Send + Sync,
126 PM: 'static + Deref<Target = PeerManager<Descriptor, CMH, RMH, L>> + Send + Sync,
128 (persister: CMP, event_handler: EH, chain_monitor: M, channel_manager: CM, peer_manager: PM, logger: L) -> Self
130 CF::Target: 'static + chain::Filter,
131 CW::Target: 'static + chain::Watch<Signer>,
132 T::Target: 'static + BroadcasterInterface,
133 K::Target: 'static + KeysInterface<Signer = Signer>,
134 F::Target: 'static + FeeEstimator,
135 L::Target: 'static + Logger,
136 P::Target: 'static + channelmonitor::Persist<Signer>,
137 CMH::Target: 'static + ChannelMessageHandler,
138 RMH::Target: 'static + RoutingMessageHandler,
140 let stop_thread = Arc::new(AtomicBool::new(false));
141 let stop_thread_clone = stop_thread.clone();
142 let handle = thread::spawn(move || -> Result<(), std::io::Error> {
143 let mut last_freshness_call = Instant::now();
144 let mut last_ping_call = Instant::now();
146 peer_manager.process_events();
147 channel_manager.process_pending_events(&event_handler);
148 chain_monitor.process_pending_events(&event_handler);
149 let updates_available =
150 channel_manager.await_persistable_update_timeout(Duration::from_millis(100));
151 if updates_available {
152 persister.persist_manager(&*channel_manager)?;
154 // Exit the loop if the background processor was requested to stop.
155 if stop_thread.load(Ordering::Acquire) == true {
156 log_trace!(logger, "Terminating background processor.");
159 if last_freshness_call.elapsed().as_secs() > FRESHNESS_TIMER {
160 log_trace!(logger, "Calling ChannelManager's timer_tick_occurred");
161 channel_manager.timer_tick_occurred();
162 last_freshness_call = Instant::now();
164 if last_ping_call.elapsed().as_secs() > PING_TIMER * 2 {
165 // On various platforms, we may be starved of CPU cycles for several reasons.
166 // E.g. on iOS, if we've been in the background, we will be entirely paused.
167 // Similarly, if we're on a desktop platform and the device has been asleep, we
168 // may not get any cycles.
169 // In any case, if we've been entirely paused for more than double our ping
170 // timer, we should have disconnected all sockets by now (and they're probably
171 // dead anyway), so disconnect them by calling `timer_tick_occurred()` twice.
172 log_trace!(logger, "Awoke after more than double our ping timer, disconnecting peers.");
173 peer_manager.timer_tick_occurred();
174 peer_manager.timer_tick_occurred();
175 last_ping_call = Instant::now();
176 } else if last_ping_call.elapsed().as_secs() > PING_TIMER {
177 log_trace!(logger, "Calling PeerManager's timer_tick_occurred");
178 peer_manager.timer_tick_occurred();
179 last_ping_call = Instant::now();
183 Self { stop_thread: stop_thread_clone, thread_handle: Some(handle) }
186 /// Join `BackgroundProcessor`'s thread, returning any error that occurred while persisting
187 /// [`ChannelManager`].
191 /// This function panics if the background thread has panicked such as while persisting or
194 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
195 pub fn join(mut self) -> Result<(), std::io::Error> {
196 assert!(self.thread_handle.is_some());
200 /// Stop `BackgroundProcessor`'s thread, returning any error that occurred while persisting
201 /// [`ChannelManager`].
205 /// This function panics if the background thread has panicked such as while persisting or
208 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
209 pub fn stop(mut self) -> Result<(), std::io::Error> {
210 assert!(self.thread_handle.is_some());
211 self.stop_and_join_thread()
214 fn stop_and_join_thread(&mut self) -> Result<(), std::io::Error> {
215 self.stop_thread.store(true, Ordering::Release);
219 fn join_thread(&mut self) -> Result<(), std::io::Error> {
220 match self.thread_handle.take() {
221 Some(handle) => handle.join().unwrap(),
227 impl Drop for BackgroundProcessor {
229 self.stop_and_join_thread().unwrap();
235 use bitcoin::blockdata::block::BlockHeader;
236 use bitcoin::blockdata::constants::genesis_block;
237 use bitcoin::blockdata::transaction::{Transaction, TxOut};
238 use bitcoin::network::constants::Network;
239 use lightning::chain::{BestBlock, Confirm, chainmonitor};
240 use lightning::chain::channelmonitor::ANTI_REORG_DELAY;
241 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
242 use lightning::chain::transaction::OutPoint;
243 use lightning::get_event_msg;
244 use lightning::ln::channelmanager::{BREAKDOWN_TIMEOUT, ChainParameters, ChannelManager, SimpleArcChannelManager};
245 use lightning::ln::features::InitFeatures;
246 use lightning::ln::msgs::{ChannelMessageHandler, Init};
247 use lightning::ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
248 use lightning::util::config::UserConfig;
249 use lightning::util::events::{Event, MessageSendEventsProvider, MessageSendEvent};
250 use lightning::util::ser::Writeable;
251 use lightning::util::test_utils;
252 use lightning_persister::FilesystemPersister;
254 use std::path::PathBuf;
255 use std::sync::{Arc, Mutex};
256 use std::time::Duration;
257 use super::{BackgroundProcessor, FRESHNESS_TIMER};
259 const EVENT_DEADLINE: u64 = 5 * FRESHNESS_TIMER;
261 #[derive(Clone, Eq, Hash, PartialEq)]
262 struct TestDescriptor{}
263 impl SocketDescriptor for TestDescriptor {
264 fn send_data(&mut self, _data: &[u8], _resume_read: bool) -> usize {
268 fn disconnect_socket(&mut self) {}
271 type ChainMonitor = chainmonitor::ChainMonitor<InMemorySigner, Arc<test_utils::TestChainSource>, Arc<test_utils::TestBroadcaster>, Arc<test_utils::TestFeeEstimator>, Arc<test_utils::TestLogger>, Arc<FilesystemPersister>>;
274 node: Arc<SimpleArcChannelManager<ChainMonitor, test_utils::TestBroadcaster, test_utils::TestFeeEstimator, test_utils::TestLogger>>,
275 peer_manager: Arc<PeerManager<TestDescriptor, Arc<test_utils::TestChannelMessageHandler>, Arc<test_utils::TestRoutingMessageHandler>, Arc<test_utils::TestLogger>>>,
276 chain_monitor: Arc<ChainMonitor>,
277 persister: Arc<FilesystemPersister>,
278 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
279 logger: Arc<test_utils::TestLogger>,
280 best_block: BestBlock,
285 let data_dir = self.persister.get_data_dir();
286 match fs::remove_dir_all(data_dir.clone()) {
287 Err(e) => println!("Failed to remove test persister directory {}: {}", data_dir, e),
293 fn get_full_filepath(filepath: String, filename: String) -> String {
294 let mut path = PathBuf::from(filepath);
296 path.to_str().unwrap().to_string()
299 fn create_nodes(num_nodes: usize, persist_dir: String) -> Vec<Node> {
300 let mut nodes = Vec::new();
301 for i in 0..num_nodes {
302 let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))});
303 let fee_estimator = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) });
304 let chain_source = Arc::new(test_utils::TestChainSource::new(Network::Testnet));
305 let logger = Arc::new(test_utils::TestLogger::with_id(format!("node {}", i)));
306 let persister = Arc::new(FilesystemPersister::new(format!("{}_persister_{}", persist_dir, i)));
307 let seed = [i as u8; 32];
308 let network = Network::Testnet;
309 let now = Duration::from_secs(genesis_block(network).header.time as u64);
310 let keys_manager = Arc::new(KeysManager::new(&seed, now.as_secs(), now.subsec_nanos()));
311 let chain_monitor = Arc::new(chainmonitor::ChainMonitor::new(Some(chain_source.clone()), tx_broadcaster.clone(), logger.clone(), fee_estimator.clone(), persister.clone()));
312 let best_block = BestBlock::from_genesis(network);
313 let params = ChainParameters { network, best_block };
314 let manager = Arc::new(ChannelManager::new(fee_estimator.clone(), chain_monitor.clone(), tx_broadcaster.clone(), logger.clone(), keys_manager.clone(), UserConfig::default(), params));
315 let msg_handler = MessageHandler { chan_handler: Arc::new(test_utils::TestChannelMessageHandler::new()), route_handler: Arc::new(test_utils::TestRoutingMessageHandler::new() )};
316 let peer_manager = Arc::new(PeerManager::new(msg_handler, keys_manager.get_node_secret(), &seed, logger.clone()));
317 let node = Node { node: manager, peer_manager, chain_monitor, persister, tx_broadcaster, logger, best_block };
321 for i in 0..num_nodes {
322 for j in (i+1)..num_nodes {
323 nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &Init { features: InitFeatures::known() });
324 nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &Init { features: InitFeatures::known() });
331 macro_rules! open_channel {
332 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
333 begin_open_channel!($node_a, $node_b, $channel_value);
334 let events = $node_a.node.get_and_clear_pending_events();
335 assert_eq!(events.len(), 1);
336 let (temporary_channel_id, tx) = handle_funding_generation_ready!(events[0], $channel_value);
337 end_open_channel!($node_a, $node_b, temporary_channel_id, tx);
342 macro_rules! begin_open_channel {
343 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
344 $node_a.node.create_channel($node_b.node.get_our_node_id(), $channel_value, 100, 42, None).unwrap();
345 $node_b.node.handle_open_channel(&$node_a.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_a, MessageSendEvent::SendOpenChannel, $node_b.node.get_our_node_id()));
346 $node_a.node.handle_accept_channel(&$node_b.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_b, MessageSendEvent::SendAcceptChannel, $node_a.node.get_our_node_id()));
350 macro_rules! handle_funding_generation_ready {
351 ($event: expr, $channel_value: expr) => {{
353 Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
354 assert_eq!(*channel_value_satoshis, $channel_value);
355 assert_eq!(user_channel_id, 42);
357 let tx = Transaction { version: 1 as i32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
358 value: *channel_value_satoshis, script_pubkey: output_script.clone(),
360 (*temporary_channel_id, tx)
362 _ => panic!("Unexpected event"),
367 macro_rules! end_open_channel {
368 ($node_a: expr, $node_b: expr, $temporary_channel_id: expr, $tx: expr) => {{
369 $node_a.node.funding_transaction_generated(&$temporary_channel_id, $tx.clone()).unwrap();
370 $node_b.node.handle_funding_created(&$node_a.node.get_our_node_id(), &get_event_msg!($node_a, MessageSendEvent::SendFundingCreated, $node_b.node.get_our_node_id()));
371 $node_a.node.handle_funding_signed(&$node_b.node.get_our_node_id(), &get_event_msg!($node_b, MessageSendEvent::SendFundingSigned, $node_a.node.get_our_node_id()));
375 fn confirm_transaction_depth(node: &mut Node, tx: &Transaction, depth: u32) {
377 let prev_blockhash = node.best_block.block_hash();
378 let height = node.best_block.height() + 1;
379 let header = BlockHeader { version: 0x20000000, prev_blockhash, merkle_root: Default::default(), time: height, bits: 42, nonce: 42 };
380 let txdata = vec![(0, tx)];
381 node.best_block = BestBlock::new(header.block_hash(), height);
384 node.node.transactions_confirmed(&header, &txdata, height);
385 node.chain_monitor.transactions_confirmed(&header, &txdata, height);
388 node.node.best_block_updated(&header, height);
389 node.chain_monitor.best_block_updated(&header, height);
395 fn confirm_transaction(node: &mut Node, tx: &Transaction) {
396 confirm_transaction_depth(node, tx, ANTI_REORG_DELAY);
400 fn test_background_processor() {
401 // Test that when a new channel is created, the ChannelManager needs to be re-persisted with
402 // updates. Also test that when new updates are available, the manager signals that it needs
403 // re-persistence and is successfully re-persisted.
404 let nodes = create_nodes(2, "test_background_processor".to_string());
406 // Go through the channel creation process so that each node has something to persist. Since
407 // open_channel consumes events, it must complete before starting BackgroundProcessor to
408 // avoid a race with processing events.
409 let tx = open_channel!(nodes[0], nodes[1], 100000);
411 // Initiate the background processors to watch each node.
412 let data_dir = nodes[0].persister.get_data_dir();
413 let persister = move |node: &ChannelManager<InMemorySigner, Arc<ChainMonitor>, Arc<test_utils::TestBroadcaster>, Arc<KeysManager>, Arc<test_utils::TestFeeEstimator>, Arc<test_utils::TestLogger>>| FilesystemPersister::persist_manager(data_dir.clone(), node);
414 let event_handler = |_| {};
415 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
417 macro_rules! check_persisted_data {
418 ($node: expr, $filepath: expr, $expected_bytes: expr) => {
419 match $node.write(&mut $expected_bytes) {
422 match std::fs::read($filepath) {
424 if bytes == $expected_bytes {
434 Err(e) => panic!("Unexpected error: {}", e)
439 // Check that the initial channel manager data is persisted as expected.
440 let filepath = get_full_filepath("test_background_processor_persister_0".to_string(), "manager".to_string());
441 let mut expected_bytes = Vec::new();
442 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
444 if !nodes[0].node.get_persistence_condvar_value() { break }
447 // Force-close the channel.
448 nodes[0].node.force_close_channel(&OutPoint { txid: tx.txid(), index: 0 }.to_channel_id()).unwrap();
450 // Check that the force-close updates are persisted.
451 let mut expected_bytes = Vec::new();
452 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
454 if !nodes[0].node.get_persistence_condvar_value() { break }
457 assert!(bg_processor.stop().is_ok());
461 fn test_timer_tick_called() {
462 // Test that ChannelManager's and PeerManager's `timer_tick_occurred` is called every
463 // `FRESHNESS_TIMER`.
464 let nodes = create_nodes(1, "test_timer_tick_called".to_string());
465 let data_dir = nodes[0].persister.get_data_dir();
466 let persister = move |node: &ChannelManager<InMemorySigner, Arc<ChainMonitor>, Arc<test_utils::TestBroadcaster>, Arc<KeysManager>, Arc<test_utils::TestFeeEstimator>, Arc<test_utils::TestLogger>>| FilesystemPersister::persist_manager(data_dir.clone(), node);
467 let event_handler = |_| {};
468 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
470 let log_entries = nodes[0].logger.lines.lock().unwrap();
471 let desired_log = "Calling ChannelManager's timer_tick_occurred".to_string();
472 let second_desired_log = "Calling PeerManager's timer_tick_occurred".to_string();
473 if log_entries.get(&("lightning_background_processor".to_string(), desired_log)).is_some() &&
474 log_entries.get(&("lightning_background_processor".to_string(), second_desired_log)).is_some() {
479 assert!(bg_processor.stop().is_ok());
483 fn test_persist_error() {
484 // Test that if we encounter an error during manager persistence, the thread panics.
485 let nodes = create_nodes(2, "test_persist_error".to_string());
486 open_channel!(nodes[0], nodes[1], 100000);
488 let persister = |_: &_| Err(std::io::Error::new(std::io::ErrorKind::Other, "test"));
489 let event_handler = |_| {};
490 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
491 match bg_processor.join() {
492 Ok(_) => panic!("Expected error persisting manager"),
494 assert_eq!(e.kind(), std::io::ErrorKind::Other);
495 assert_eq!(e.get_ref().unwrap().to_string(), "test");
501 fn test_background_event_handling() {
502 let mut nodes = create_nodes(2, "test_background_event_handling".to_string());
503 let channel_value = 100000;
504 let data_dir = nodes[0].persister.get_data_dir();
505 let persister = move |node: &_| FilesystemPersister::persist_manager(data_dir.clone(), node);
507 // Set up a background event handler for FundingGenerationReady events.
508 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
509 let event_handler = move |event| {
510 sender.send(handle_funding_generation_ready!(event, channel_value)).unwrap();
512 let bg_processor = BackgroundProcessor::start(persister.clone(), event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
514 // Open a channel and check that the FundingGenerationReady event was handled.
515 begin_open_channel!(nodes[0], nodes[1], channel_value);
516 let (temporary_channel_id, funding_tx) = receiver
517 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
518 .expect("FundingGenerationReady not handled within deadline");
519 end_open_channel!(nodes[0], nodes[1], temporary_channel_id, funding_tx);
521 // Confirm the funding transaction.
522 confirm_transaction(&mut nodes[0], &funding_tx);
523 let as_funding = get_event_msg!(nodes[0], MessageSendEvent::SendFundingLocked, nodes[1].node.get_our_node_id());
524 confirm_transaction(&mut nodes[1], &funding_tx);
525 let bs_funding = get_event_msg!(nodes[1], MessageSendEvent::SendFundingLocked, nodes[0].node.get_our_node_id());
526 nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &bs_funding);
527 let _as_channel_update = get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
528 nodes[1].node.handle_funding_locked(&nodes[0].node.get_our_node_id(), &as_funding);
529 let _bs_channel_update = get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
531 assert!(bg_processor.stop().is_ok());
533 // Set up a background event handler for SpendableOutputs events.
534 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
535 let event_handler = move |event| sender.send(event).unwrap();
536 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
538 // Force close the channel and check that the SpendableOutputs event was handled.
539 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
540 let commitment_tx = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().pop().unwrap();
541 confirm_transaction_depth(&mut nodes[0], &commitment_tx, BREAKDOWN_TIMEOUT as u32);
543 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
544 .expect("SpendableOutputs not handled within deadline");
546 Event::SpendableOutputs { .. } => {},
547 _ => panic!("Unexpected event: {:?}", event),
550 assert!(bg_processor.stop().is_ok());