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, Persist};
14 use lightning::chain::keysinterface::{Sign, KeysInterface};
15 use lightning::ln::channelmanager::ChannelManager;
16 use lightning::ln::msgs::{ChannelMessageHandler, RoutingMessageHandler};
17 use lightning::ln::peer_handler::{CustomMessageHandler, PeerManager, SocketDescriptor};
18 use lightning::routing::network_graph::NetGraphMsgHandler;
19 use lightning::util::events::{Event, 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 /// * Processing [`Event`]s with a user-provided [`EventHandler`].
32 /// * Monitoring whether the [`ChannelManager`] needs to be re-persisted to disk, and if so,
33 /// writing it to disk/backups by invoking the callback given to it at startup.
34 /// [`ChannelManager`] persistence should be done in the background.
35 /// * Calling [`ChannelManager::timer_tick_occurred`] and [`PeerManager::timer_tick_occurred`]
36 /// at the appropriate intervals.
38 /// It will also call [`PeerManager::process_events`] periodically though this shouldn't be relied
39 /// upon as doing so may result in high latency.
43 /// If [`ChannelManager`] persistence fails and the persisted manager becomes out-of-date, then
44 /// there is a risk of channels force-closing on startup when the manager realizes it's outdated.
45 /// However, as long as [`ChannelMonitor`] backups are sound, no funds besides those used for
46 /// unilateral chain closure fees are at risk.
48 /// [`ChannelMonitor`]: lightning::chain::channelmonitor::ChannelMonitor
49 /// [`Event`]: lightning::util::events::Event
50 #[must_use = "BackgroundProcessor will immediately stop on drop. It should be stored until shutdown."]
51 pub struct BackgroundProcessor {
52 stop_thread: Arc<AtomicBool>,
53 thread_handle: Option<JoinHandle<Result<(), std::io::Error>>>,
57 const FRESHNESS_TIMER: u64 = 60;
59 const FRESHNESS_TIMER: u64 = 1;
61 #[cfg(all(not(test), not(debug_assertions)))]
62 const PING_TIMER: u64 = 5;
63 /// Signature operations take a lot longer without compiler optimisations.
64 /// Increasing the ping timer allows for this but slower devices will be disconnected if the
65 /// timeout is reached.
66 #[cfg(all(not(test), debug_assertions))]
67 const PING_TIMER: u64 = 30;
69 const PING_TIMER: u64 = 1;
71 /// Trait which handles persisting a [`ChannelManager`] to disk.
73 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
74 pub trait ChannelManagerPersister<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
76 M::Target: 'static + chain::Watch<Signer>,
77 T::Target: 'static + BroadcasterInterface,
78 K::Target: 'static + KeysInterface<Signer = Signer>,
79 F::Target: 'static + FeeEstimator,
80 L::Target: 'static + Logger,
82 /// Persist the given [`ChannelManager`] to disk, returning an error if persistence failed
83 /// (which will cause the [`BackgroundProcessor`] which called this method to exit.
85 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
86 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>;
89 impl<Fun, Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
90 ChannelManagerPersister<Signer, M, T, K, F, L> for Fun where
91 M::Target: 'static + chain::Watch<Signer>,
92 T::Target: 'static + BroadcasterInterface,
93 K::Target: 'static + KeysInterface<Signer = Signer>,
94 F::Target: 'static + FeeEstimator,
95 L::Target: 'static + Logger,
96 Fun: Fn(&ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>,
98 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error> {
103 /// Decorates an [`EventHandler`] with common functionality provided by standard [`EventHandler`]s.
104 struct DecoratingEventHandler<
106 N: Deref<Target = NetGraphMsgHandler<A, L>>,
110 where A::Target: chain::Access, L::Target: Logger {
112 net_graph_msg_handler: Option<N>,
117 N: Deref<Target = NetGraphMsgHandler<A, L>>,
120 > EventHandler for DecoratingEventHandler<E, N, A, L>
121 where A::Target: chain::Access, L::Target: Logger {
122 fn handle_event(&self, event: &Event) {
123 if let Some(event_handler) = &self.net_graph_msg_handler {
124 event_handler.handle_event(event);
126 self.event_handler.handle_event(event);
130 impl BackgroundProcessor {
131 /// Start a background thread that takes care of responsibilities enumerated in the [top-level
134 /// The thread runs indefinitely unless the object is dropped, [`stop`] is called, or
135 /// `persist_manager` returns an error. In case of an error, the error is retrieved by calling
136 /// either [`join`] or [`stop`].
138 /// # Data Persistence
140 /// `persist_manager` is responsible for writing out the [`ChannelManager`] to disk, and/or
141 /// uploading to one or more backup services. See [`ChannelManager::write`] for writing out a
142 /// [`ChannelManager`]. See [`FilesystemPersister::persist_manager`] for Rust-Lightning's
143 /// provided implementation.
145 /// Typically, users should either implement [`ChannelManagerPersister`] to never return an
146 /// error or call [`join`] and handle any error that may arise. For the latter case,
147 /// `BackgroundProcessor` must be restarted by calling `start` again after handling the error.
151 /// `event_handler` is responsible for handling events that users should be notified of (e.g.,
152 /// payment failed). [`BackgroundProcessor`] may decorate the given [`EventHandler`] with common
153 /// functionality implemented by other handlers.
154 /// * [`NetGraphMsgHandler`] if given will update the [`NetworkGraph`] based on payment failures.
156 /// [top-level documentation]: Self
157 /// [`join`]: Self::join
158 /// [`stop`]: Self::stop
159 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
160 /// [`ChannelManager::write`]: lightning::ln::channelmanager::ChannelManager#impl-Writeable
161 /// [`FilesystemPersister::persist_manager`]: lightning_persister::FilesystemPersister::persist_manager
162 /// [`NetworkGraph`]: lightning::routing::network_graph::NetworkGraph
164 Signer: 'static + Sign,
165 CA: 'static + Deref + Send + Sync,
166 CF: 'static + Deref + Send + Sync,
167 CW: 'static + Deref + Send + Sync,
168 T: 'static + Deref + Send + Sync,
169 K: 'static + Deref + Send + Sync,
170 F: 'static + Deref + Send + Sync,
171 L: 'static + Deref + Send + Sync,
172 P: 'static + Deref + Send + Sync,
173 Descriptor: 'static + SocketDescriptor + Send + Sync,
174 CMH: 'static + Deref + Send + Sync,
175 RMH: 'static + Deref + Send + Sync,
176 EH: 'static + EventHandler + Send + Sync,
177 CMP: 'static + Send + ChannelManagerPersister<Signer, CW, T, K, F, L>,
178 M: 'static + Deref<Target = ChainMonitor<Signer, CF, T, F, L, P>> + Send + Sync,
179 CM: 'static + Deref<Target = ChannelManager<Signer, CW, T, K, F, L>> + Send + Sync,
180 NG: 'static + Deref<Target = NetGraphMsgHandler<CA, L>> + Send + Sync,
181 UMH: 'static + Deref + Send + Sync,
182 PM: 'static + Deref<Target = PeerManager<Descriptor, CMH, RMH, L, UMH>> + Send + Sync,
184 persister: CMP, event_handler: EH, chain_monitor: M, channel_manager: CM,
185 net_graph_msg_handler: Option<NG>, peer_manager: PM, logger: L
188 CA::Target: 'static + chain::Access,
189 CF::Target: 'static + chain::Filter,
190 CW::Target: 'static + chain::Watch<Signer>,
191 T::Target: 'static + BroadcasterInterface,
192 K::Target: 'static + KeysInterface<Signer = Signer>,
193 F::Target: 'static + FeeEstimator,
194 L::Target: 'static + Logger,
195 P::Target: 'static + Persist<Signer>,
196 CMH::Target: 'static + ChannelMessageHandler,
197 RMH::Target: 'static + RoutingMessageHandler,
198 UMH::Target: 'static + CustomMessageHandler,
200 let stop_thread = Arc::new(AtomicBool::new(false));
201 let stop_thread_clone = stop_thread.clone();
202 let handle = thread::spawn(move || -> Result<(), std::io::Error> {
203 let event_handler = DecoratingEventHandler { event_handler, net_graph_msg_handler };
205 log_trace!(logger, "Calling ChannelManager's timer_tick_occurred on startup");
206 channel_manager.timer_tick_occurred();
208 let mut last_freshness_call = Instant::now();
209 let mut last_ping_call = Instant::now();
211 peer_manager.process_events();
212 channel_manager.process_pending_events(&event_handler);
213 chain_monitor.process_pending_events(&event_handler);
214 let updates_available =
215 channel_manager.await_persistable_update_timeout(Duration::from_millis(100));
216 if updates_available {
217 persister.persist_manager(&*channel_manager)?;
219 // Exit the loop if the background processor was requested to stop.
220 if stop_thread.load(Ordering::Acquire) == true {
221 log_trace!(logger, "Terminating background processor.");
224 if last_freshness_call.elapsed().as_secs() > FRESHNESS_TIMER {
225 log_trace!(logger, "Calling ChannelManager's timer_tick_occurred");
226 channel_manager.timer_tick_occurred();
227 last_freshness_call = Instant::now();
229 if last_ping_call.elapsed().as_secs() > PING_TIMER * 2 {
230 // On various platforms, we may be starved of CPU cycles for several reasons.
231 // E.g. on iOS, if we've been in the background, we will be entirely paused.
232 // Similarly, if we're on a desktop platform and the device has been asleep, we
233 // may not get any cycles.
234 // In any case, if we've been entirely paused for more than double our ping
235 // timer, we should have disconnected all sockets by now (and they're probably
236 // dead anyway), so disconnect them by calling `timer_tick_occurred()` twice.
237 log_trace!(logger, "Awoke after more than double our ping timer, disconnecting peers.");
238 peer_manager.disconnect_all_peers();
239 last_ping_call = Instant::now();
240 } else if last_ping_call.elapsed().as_secs() > PING_TIMER {
241 log_trace!(logger, "Calling PeerManager's timer_tick_occurred");
242 peer_manager.timer_tick_occurred();
243 last_ping_call = Instant::now();
247 Self { stop_thread: stop_thread_clone, thread_handle: Some(handle) }
250 /// Join `BackgroundProcessor`'s thread, returning any error that occurred while persisting
251 /// [`ChannelManager`].
255 /// This function panics if the background thread has panicked such as while persisting or
258 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
259 pub fn join(mut self) -> Result<(), std::io::Error> {
260 assert!(self.thread_handle.is_some());
264 /// Stop `BackgroundProcessor`'s thread, returning any error that occurred while persisting
265 /// [`ChannelManager`].
269 /// This function panics if the background thread has panicked such as while persisting or
272 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
273 pub fn stop(mut self) -> Result<(), std::io::Error> {
274 assert!(self.thread_handle.is_some());
275 self.stop_and_join_thread()
278 fn stop_and_join_thread(&mut self) -> Result<(), std::io::Error> {
279 self.stop_thread.store(true, Ordering::Release);
283 fn join_thread(&mut self) -> Result<(), std::io::Error> {
284 match self.thread_handle.take() {
285 Some(handle) => handle.join().unwrap(),
291 impl Drop for BackgroundProcessor {
293 self.stop_and_join_thread().unwrap();
299 use bitcoin::blockdata::block::BlockHeader;
300 use bitcoin::blockdata::constants::genesis_block;
301 use bitcoin::blockdata::transaction::{Transaction, TxOut};
302 use bitcoin::network::constants::Network;
303 use lightning::chain::{BestBlock, Confirm, chainmonitor};
304 use lightning::chain::channelmonitor::ANTI_REORG_DELAY;
305 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
306 use lightning::chain::transaction::OutPoint;
307 use lightning::get_event_msg;
308 use lightning::ln::channelmanager::{BREAKDOWN_TIMEOUT, ChainParameters, ChannelManager, SimpleArcChannelManager};
309 use lightning::ln::features::InitFeatures;
310 use lightning::ln::msgs::{ChannelMessageHandler, Init};
311 use lightning::ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler};
312 use lightning::routing::network_graph::{NetworkGraph, NetGraphMsgHandler};
313 use lightning::util::config::UserConfig;
314 use lightning::util::events::{Event, MessageSendEventsProvider, MessageSendEvent};
315 use lightning::util::ser::Writeable;
316 use lightning::util::test_utils;
317 use lightning_persister::FilesystemPersister;
319 use std::path::PathBuf;
320 use std::sync::{Arc, Mutex};
321 use std::time::Duration;
322 use super::{BackgroundProcessor, FRESHNESS_TIMER};
324 const EVENT_DEADLINE: u64 = 5 * FRESHNESS_TIMER;
326 #[derive(Clone, Eq, Hash, PartialEq)]
327 struct TestDescriptor{}
328 impl SocketDescriptor for TestDescriptor {
329 fn send_data(&mut self, _data: &[u8], _resume_read: bool) -> usize {
333 fn disconnect_socket(&mut self) {}
336 type ChainMonitor = chainmonitor::ChainMonitor<InMemorySigner, Arc<test_utils::TestChainSource>, Arc<test_utils::TestBroadcaster>, Arc<test_utils::TestFeeEstimator>, Arc<test_utils::TestLogger>, Arc<FilesystemPersister>>;
339 node: Arc<SimpleArcChannelManager<ChainMonitor, test_utils::TestBroadcaster, test_utils::TestFeeEstimator, test_utils::TestLogger>>,
340 net_graph_msg_handler: Option<Arc<NetGraphMsgHandler<Arc<test_utils::TestChainSource>, Arc<test_utils::TestLogger>>>>,
341 peer_manager: Arc<PeerManager<TestDescriptor, Arc<test_utils::TestChannelMessageHandler>, Arc<test_utils::TestRoutingMessageHandler>, Arc<test_utils::TestLogger>, IgnoringMessageHandler>>,
342 chain_monitor: Arc<ChainMonitor>,
343 persister: Arc<FilesystemPersister>,
344 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
345 logger: Arc<test_utils::TestLogger>,
346 best_block: BestBlock,
351 let data_dir = self.persister.get_data_dir();
352 match fs::remove_dir_all(data_dir.clone()) {
353 Err(e) => println!("Failed to remove test persister directory {}: {}", data_dir, e),
359 fn get_full_filepath(filepath: String, filename: String) -> String {
360 let mut path = PathBuf::from(filepath);
362 path.to_str().unwrap().to_string()
365 fn create_nodes(num_nodes: usize, persist_dir: String) -> Vec<Node> {
366 let mut nodes = Vec::new();
367 for i in 0..num_nodes {
368 let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))});
369 let fee_estimator = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) });
370 let chain_source = Arc::new(test_utils::TestChainSource::new(Network::Testnet));
371 let logger = Arc::new(test_utils::TestLogger::with_id(format!("node {}", i)));
372 let persister = Arc::new(FilesystemPersister::new(format!("{}_persister_{}", persist_dir, i)));
373 let seed = [i as u8; 32];
374 let network = Network::Testnet;
375 let genesis_block = genesis_block(network);
376 let now = Duration::from_secs(genesis_block.header.time as u64);
377 let keys_manager = Arc::new(KeysManager::new(&seed, now.as_secs(), now.subsec_nanos()));
378 let chain_monitor = Arc::new(chainmonitor::ChainMonitor::new(Some(chain_source.clone()), tx_broadcaster.clone(), logger.clone(), fee_estimator.clone(), persister.clone()));
379 let best_block = BestBlock::from_genesis(network);
380 let params = ChainParameters { network, best_block };
381 let manager = Arc::new(ChannelManager::new(fee_estimator.clone(), chain_monitor.clone(), tx_broadcaster.clone(), logger.clone(), keys_manager.clone(), UserConfig::default(), params));
382 let network_graph = NetworkGraph::new(genesis_block.header.block_hash());
383 let net_graph_msg_handler = Some(Arc::new(NetGraphMsgHandler::new(network_graph, Some(chain_source.clone()), logger.clone())));
384 let msg_handler = MessageHandler { chan_handler: Arc::new(test_utils::TestChannelMessageHandler::new()), route_handler: Arc::new(test_utils::TestRoutingMessageHandler::new() )};
385 let peer_manager = Arc::new(PeerManager::new(msg_handler, keys_manager.get_node_secret(), &seed, logger.clone(), IgnoringMessageHandler{}));
386 let node = Node { node: manager, net_graph_msg_handler, peer_manager, chain_monitor, persister, tx_broadcaster, logger, best_block };
390 for i in 0..num_nodes {
391 for j in (i+1)..num_nodes {
392 nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &Init { features: InitFeatures::known() });
393 nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &Init { features: InitFeatures::known() });
400 macro_rules! open_channel {
401 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
402 begin_open_channel!($node_a, $node_b, $channel_value);
403 let events = $node_a.node.get_and_clear_pending_events();
404 assert_eq!(events.len(), 1);
405 let (temporary_channel_id, tx) = handle_funding_generation_ready!(&events[0], $channel_value);
406 end_open_channel!($node_a, $node_b, temporary_channel_id, tx);
411 macro_rules! begin_open_channel {
412 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
413 $node_a.node.create_channel($node_b.node.get_our_node_id(), $channel_value, 100, 42, None).unwrap();
414 $node_b.node.handle_open_channel(&$node_a.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_a, MessageSendEvent::SendOpenChannel, $node_b.node.get_our_node_id()));
415 $node_a.node.handle_accept_channel(&$node_b.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_b, MessageSendEvent::SendAcceptChannel, $node_a.node.get_our_node_id()));
419 macro_rules! handle_funding_generation_ready {
420 ($event: expr, $channel_value: expr) => {{
422 &Event::FundingGenerationReady { temporary_channel_id, channel_value_satoshis, ref output_script, user_channel_id } => {
423 assert_eq!(channel_value_satoshis, $channel_value);
424 assert_eq!(user_channel_id, 42);
426 let tx = Transaction { version: 1 as i32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
427 value: channel_value_satoshis, script_pubkey: output_script.clone(),
429 (temporary_channel_id, tx)
431 _ => panic!("Unexpected event"),
436 macro_rules! end_open_channel {
437 ($node_a: expr, $node_b: expr, $temporary_channel_id: expr, $tx: expr) => {{
438 $node_a.node.funding_transaction_generated(&$temporary_channel_id, $tx.clone()).unwrap();
439 $node_b.node.handle_funding_created(&$node_a.node.get_our_node_id(), &get_event_msg!($node_a, MessageSendEvent::SendFundingCreated, $node_b.node.get_our_node_id()));
440 $node_a.node.handle_funding_signed(&$node_b.node.get_our_node_id(), &get_event_msg!($node_b, MessageSendEvent::SendFundingSigned, $node_a.node.get_our_node_id()));
444 fn confirm_transaction_depth(node: &mut Node, tx: &Transaction, depth: u32) {
446 let prev_blockhash = node.best_block.block_hash();
447 let height = node.best_block.height() + 1;
448 let header = BlockHeader { version: 0x20000000, prev_blockhash, merkle_root: Default::default(), time: height, bits: 42, nonce: 42 };
449 let txdata = vec![(0, tx)];
450 node.best_block = BestBlock::new(header.block_hash(), height);
453 node.node.transactions_confirmed(&header, &txdata, height);
454 node.chain_monitor.transactions_confirmed(&header, &txdata, height);
457 node.node.best_block_updated(&header, height);
458 node.chain_monitor.best_block_updated(&header, height);
464 fn confirm_transaction(node: &mut Node, tx: &Transaction) {
465 confirm_transaction_depth(node, tx, ANTI_REORG_DELAY);
469 fn test_background_processor() {
470 // Test that when a new channel is created, the ChannelManager needs to be re-persisted with
471 // updates. Also test that when new updates are available, the manager signals that it needs
472 // re-persistence and is successfully re-persisted.
473 let nodes = create_nodes(2, "test_background_processor".to_string());
475 // Go through the channel creation process so that each node has something to persist. Since
476 // open_channel consumes events, it must complete before starting BackgroundProcessor to
477 // avoid a race with processing events.
478 let tx = open_channel!(nodes[0], nodes[1], 100000);
480 // Initiate the background processors to watch each node.
481 let data_dir = nodes[0].persister.get_data_dir();
482 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);
483 let event_handler = |_: &_| {};
484 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].net_graph_msg_handler.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
486 macro_rules! check_persisted_data {
487 ($node: expr, $filepath: expr, $expected_bytes: expr) => {
488 match $node.write(&mut $expected_bytes) {
491 match std::fs::read($filepath) {
493 if bytes == $expected_bytes {
503 Err(e) => panic!("Unexpected error: {}", e)
508 // Check that the initial channel manager data is persisted as expected.
509 let filepath = get_full_filepath("test_background_processor_persister_0".to_string(), "manager".to_string());
510 let mut expected_bytes = Vec::new();
511 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
513 if !nodes[0].node.get_persistence_condvar_value() { break }
516 // Force-close the channel.
517 nodes[0].node.force_close_channel(&OutPoint { txid: tx.txid(), index: 0 }.to_channel_id()).unwrap();
519 // Check that the force-close updates are persisted.
520 let mut expected_bytes = Vec::new();
521 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
523 if !nodes[0].node.get_persistence_condvar_value() { break }
526 assert!(bg_processor.stop().is_ok());
530 fn test_timer_tick_called() {
531 // Test that ChannelManager's and PeerManager's `timer_tick_occurred` is called every
532 // `FRESHNESS_TIMER`.
533 let nodes = create_nodes(1, "test_timer_tick_called".to_string());
534 let data_dir = nodes[0].persister.get_data_dir();
535 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);
536 let event_handler = |_: &_| {};
537 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].net_graph_msg_handler.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
539 let log_entries = nodes[0].logger.lines.lock().unwrap();
540 let desired_log = "Calling ChannelManager's timer_tick_occurred".to_string();
541 let second_desired_log = "Calling PeerManager's timer_tick_occurred".to_string();
542 if log_entries.get(&("lightning_background_processor".to_string(), desired_log)).is_some() &&
543 log_entries.get(&("lightning_background_processor".to_string(), second_desired_log)).is_some() {
548 assert!(bg_processor.stop().is_ok());
552 fn test_persist_error() {
553 // Test that if we encounter an error during manager persistence, the thread panics.
554 let nodes = create_nodes(2, "test_persist_error".to_string());
555 open_channel!(nodes[0], nodes[1], 100000);
557 let persister = |_: &_| Err(std::io::Error::new(std::io::ErrorKind::Other, "test"));
558 let event_handler = |_: &_| {};
559 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].net_graph_msg_handler.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
560 match bg_processor.join() {
561 Ok(_) => panic!("Expected error persisting manager"),
563 assert_eq!(e.kind(), std::io::ErrorKind::Other);
564 assert_eq!(e.get_ref().unwrap().to_string(), "test");
570 fn test_background_event_handling() {
571 let mut nodes = create_nodes(2, "test_background_event_handling".to_string());
572 let channel_value = 100000;
573 let data_dir = nodes[0].persister.get_data_dir();
574 let persister = move |node: &_| FilesystemPersister::persist_manager(data_dir.clone(), node);
576 // Set up a background event handler for FundingGenerationReady events.
577 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
578 let event_handler = move |event: &Event| {
579 sender.send(handle_funding_generation_ready!(event, channel_value)).unwrap();
581 let bg_processor = BackgroundProcessor::start(persister.clone(), event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].net_graph_msg_handler.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
583 // Open a channel and check that the FundingGenerationReady event was handled.
584 begin_open_channel!(nodes[0], nodes[1], channel_value);
585 let (temporary_channel_id, funding_tx) = receiver
586 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
587 .expect("FundingGenerationReady not handled within deadline");
588 end_open_channel!(nodes[0], nodes[1], temporary_channel_id, funding_tx);
590 // Confirm the funding transaction.
591 confirm_transaction(&mut nodes[0], &funding_tx);
592 let as_funding = get_event_msg!(nodes[0], MessageSendEvent::SendFundingLocked, nodes[1].node.get_our_node_id());
593 confirm_transaction(&mut nodes[1], &funding_tx);
594 let bs_funding = get_event_msg!(nodes[1], MessageSendEvent::SendFundingLocked, nodes[0].node.get_our_node_id());
595 nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &bs_funding);
596 let _as_channel_update = get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
597 nodes[1].node.handle_funding_locked(&nodes[0].node.get_our_node_id(), &as_funding);
598 let _bs_channel_update = get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
600 assert!(bg_processor.stop().is_ok());
602 // Set up a background event handler for SpendableOutputs events.
603 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
604 let event_handler = move |event: &Event| sender.send(event.clone()).unwrap();
605 let bg_processor = BackgroundProcessor::start(persister, event_handler, nodes[0].chain_monitor.clone(), nodes[0].node.clone(), nodes[0].net_graph_msg_handler.clone(), nodes[0].peer_manager.clone(), nodes[0].logger.clone());
607 // Force close the channel and check that the SpendableOutputs event was handled.
608 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
609 let commitment_tx = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().pop().unwrap();
610 confirm_transaction_depth(&mut nodes[0], &commitment_tx, BREAKDOWN_TIMEOUT as u32);
612 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
613 .expect("SpendableOutputs not handled within deadline");
615 Event::SpendableOutputs { .. } => {},
616 Event::ChannelClosed { .. } => {},
617 _ => panic!("Unexpected event: {:?}", event),
620 assert!(bg_processor.stop().is_ok());