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::{PeerManager, SocketDescriptor};
18 use lightning::ln::peer_handler::CustomMessageHandler;
19 use lightning::routing::network_graph::NetGraphMsgHandler;
20 use lightning::util::events::{Event, EventHandler, EventsProvider};
21 use lightning::util::logger::Logger;
23 use std::sync::atomic::{AtomicBool, Ordering};
25 use std::thread::JoinHandle;
26 use std::time::{Duration, Instant};
29 /// `BackgroundProcessor` takes care of tasks that (1) need to happen periodically to keep
30 /// Rust-Lightning running properly, and (2) either can or should be run in the background. Its
31 /// responsibilities are:
32 /// * Processing [`Event`]s with a user-provided [`EventHandler`].
33 /// * Monitoring whether the [`ChannelManager`] needs to be re-persisted to disk, and if so,
34 /// writing it to disk/backups by invoking the callback given to it at startup.
35 /// [`ChannelManager`] persistence should be done in the background.
36 /// * Calling [`ChannelManager::timer_tick_occurred`] and [`PeerManager::timer_tick_occurred`]
37 /// at the appropriate intervals.
39 /// It will also call [`PeerManager::process_events`] periodically though this shouldn't be relied
40 /// upon as doing so may result in high latency.
44 /// If [`ChannelManager`] persistence fails and the persisted manager becomes out-of-date, then
45 /// there is a risk of channels force-closing on startup when the manager realizes it's outdated.
46 /// However, as long as [`ChannelMonitor`] backups are sound, no funds besides those used for
47 /// unilateral chain closure fees are at risk.
49 /// [`ChannelMonitor`]: lightning::chain::channelmonitor::ChannelMonitor
50 /// [`Event`]: lightning::util::events::Event
51 #[must_use = "BackgroundProcessor will immediately stop on drop. It should be stored until shutdown."]
52 pub struct BackgroundProcessor {
53 stop_thread: Arc<AtomicBool>,
54 thread_handle: Option<JoinHandle<Result<(), std::io::Error>>>,
58 const FRESHNESS_TIMER: u64 = 60;
60 const FRESHNESS_TIMER: u64 = 1;
62 #[cfg(all(not(test), not(debug_assertions)))]
63 const PING_TIMER: u64 = 5;
64 /// Signature operations take a lot longer without compiler optimisations.
65 /// Increasing the ping timer allows for this but slower devices will be disconnected if the
66 /// timeout is reached.
67 #[cfg(all(not(test), debug_assertions))]
68 const PING_TIMER: u64 = 30;
70 const PING_TIMER: u64 = 1;
72 /// Trait which handles persisting a [`ChannelManager`] to disk.
74 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
75 pub trait ChannelManagerPersister<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
77 M::Target: 'static + chain::Watch<Signer>,
78 T::Target: 'static + BroadcasterInterface,
79 K::Target: 'static + KeysInterface<Signer = Signer>,
80 F::Target: 'static + FeeEstimator,
81 L::Target: 'static + Logger,
83 /// Persist the given [`ChannelManager`] to disk, returning an error if persistence failed
84 /// (which will cause the [`BackgroundProcessor`] which called this method to exit.
86 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
87 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>;
90 impl<Fun, Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
91 ChannelManagerPersister<Signer, M, T, K, F, L> for Fun where
92 M::Target: 'static + chain::Watch<Signer>,
93 T::Target: 'static + BroadcasterInterface,
94 K::Target: 'static + KeysInterface<Signer = Signer>,
95 F::Target: 'static + FeeEstimator,
96 L::Target: 'static + Logger,
97 Fun: Fn(&ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error>,
99 fn persist_manager(&self, channel_manager: &ChannelManager<Signer, M, T, K, F, L>) -> Result<(), std::io::Error> {
100 self(channel_manager)
104 /// Decorates an [`EventHandler`] with common functionality provided by standard [`EventHandler`]s.
105 struct DecoratingEventHandler<
107 N: Deref<Target = NetGraphMsgHandler<A, L>>,
111 where A::Target: chain::Access, L::Target: Logger {
113 net_graph_msg_handler: Option<N>,
118 N: Deref<Target = NetGraphMsgHandler<A, L>>,
121 > EventHandler for DecoratingEventHandler<E, N, A, L>
122 where A::Target: chain::Access, L::Target: Logger {
123 fn handle_event(&self, event: &Event) {
124 if let Some(event_handler) = &self.net_graph_msg_handler {
125 event_handler.handle_event(event);
127 self.event_handler.handle_event(event);
131 impl BackgroundProcessor {
132 /// Start a background thread that takes care of responsibilities enumerated in the [top-level
135 /// The thread runs indefinitely unless the object is dropped, [`stop`] is called, or
136 /// `persist_manager` returns an error. In case of an error, the error is retrieved by calling
137 /// either [`join`] or [`stop`].
139 /// # Data Persistence
141 /// `persist_manager` is responsible for writing out the [`ChannelManager`] to disk, and/or
142 /// uploading to one or more backup services. See [`ChannelManager::write`] for writing out a
143 /// [`ChannelManager`]. See [`FilesystemPersister::persist_manager`] for Rust-Lightning's
144 /// provided implementation.
146 /// Typically, users should either implement [`ChannelManagerPersister`] to never return an
147 /// error or call [`join`] and handle any error that may arise. For the latter case,
148 /// `BackgroundProcessor` must be restarted by calling `start` again after handling the error.
152 /// `event_handler` is responsible for handling events that users should be notified of (e.g.,
153 /// payment failed). [`BackgroundProcessor`] may decorate the given [`EventHandler`] with common
154 /// functionality implemented by other handlers.
155 /// * [`NetGraphMsgHandler`] if given will update the [`NetworkGraph`] based on payment failures.
157 /// [top-level documentation]: Self
158 /// [`join`]: Self::join
159 /// [`stop`]: Self::stop
160 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
161 /// [`ChannelManager::write`]: lightning::ln::channelmanager::ChannelManager#impl-Writeable
162 /// [`FilesystemPersister::persist_manager`]: lightning_persister::FilesystemPersister::persist_manager
163 /// [`NetworkGraph`]: lightning::routing::network_graph::NetworkGraph
165 Signer: 'static + Sign,
166 CA: 'static + Deref + Send + Sync,
167 CF: 'static + Deref + Send + Sync,
168 CW: 'static + Deref + Send + Sync,
169 T: 'static + Deref + Send + Sync,
170 K: 'static + Deref + Send + Sync,
171 F: 'static + Deref + Send + Sync,
172 L: 'static + Deref + Send + Sync,
173 P: 'static + Deref + Send + Sync,
174 Descriptor: 'static + SocketDescriptor + Send + Sync,
175 CMH: 'static + Deref + Send + Sync,
176 RMH: 'static + Deref + Send + Sync,
177 EH: 'static + EventHandler + Send + Sync,
178 CMP: 'static + Send + ChannelManagerPersister<Signer, CW, T, K, F, L>,
179 M: 'static + Deref<Target = ChainMonitor<Signer, CF, T, F, L, P>> + Send + Sync,
180 CM: 'static + Deref<Target = ChannelManager<Signer, CW, T, K, F, L>> + Send + Sync,
181 NG: 'static + Deref<Target = NetGraphMsgHandler<CA, L>> + Send + Sync,
182 UMH: 'static + Deref + Send + Sync,
183 PM: 'static + Deref<Target = PeerManager<Descriptor, CMH, RMH, L, UMH>> + Send + Sync,
185 persister: CMP, event_handler: EH, chain_monitor: M, channel_manager: CM,
186 net_graph_msg_handler: Option<NG>, peer_manager: PM, logger: L
189 CA::Target: 'static + chain::Access,
190 CF::Target: 'static + chain::Filter,
191 CW::Target: 'static + chain::Watch<Signer>,
192 T::Target: 'static + BroadcasterInterface,
193 K::Target: 'static + KeysInterface<Signer = Signer>,
194 F::Target: 'static + FeeEstimator,
195 L::Target: 'static + Logger,
196 P::Target: 'static + Persist<Signer>,
197 CMH::Target: 'static + ChannelMessageHandler,
198 RMH::Target: 'static + RoutingMessageHandler,
199 UMH::Target: 'static + CustomMessageHandler,
201 let stop_thread = Arc::new(AtomicBool::new(false));
202 let stop_thread_clone = stop_thread.clone();
203 let handle = thread::spawn(move || -> Result<(), std::io::Error> {
204 let event_handler = DecoratingEventHandler { event_handler, net_graph_msg_handler };
206 log_trace!(logger, "Calling ChannelManager's timer_tick_occurred on startup");
207 channel_manager.timer_tick_occurred();
209 let mut last_freshness_call = Instant::now();
210 let mut last_ping_call = Instant::now();
212 peer_manager.process_events();
213 channel_manager.process_pending_events(&event_handler);
214 chain_monitor.process_pending_events(&event_handler);
215 let updates_available =
216 channel_manager.await_persistable_update_timeout(Duration::from_millis(100));
217 if updates_available {
218 persister.persist_manager(&*channel_manager)?;
220 // Exit the loop if the background processor was requested to stop.
221 if stop_thread.load(Ordering::Acquire) == true {
222 log_trace!(logger, "Terminating background processor.");
225 if last_freshness_call.elapsed().as_secs() > FRESHNESS_TIMER {
226 log_trace!(logger, "Calling ChannelManager's timer_tick_occurred");
227 channel_manager.timer_tick_occurred();
228 last_freshness_call = Instant::now();
230 if last_ping_call.elapsed().as_secs() > PING_TIMER * 2 {
231 // On various platforms, we may be starved of CPU cycles for several reasons.
232 // E.g. on iOS, if we've been in the background, we will be entirely paused.
233 // Similarly, if we're on a desktop platform and the device has been asleep, we
234 // may not get any cycles.
235 // In any case, if we've been entirely paused for more than double our ping
236 // timer, we should have disconnected all sockets by now (and they're probably
237 // dead anyway), so disconnect them by calling `timer_tick_occurred()` twice.
238 log_trace!(logger, "Awoke after more than double our ping timer, disconnecting peers.");
239 peer_manager.timer_tick_occurred();
240 peer_manager.timer_tick_occurred();
241 last_ping_call = Instant::now();
242 } else if last_ping_call.elapsed().as_secs() > PING_TIMER {
243 log_trace!(logger, "Calling PeerManager's timer_tick_occurred");
244 peer_manager.timer_tick_occurred();
245 last_ping_call = Instant::now();
249 Self { stop_thread: stop_thread_clone, thread_handle: Some(handle) }
252 /// Join `BackgroundProcessor`'s thread, returning any error that occurred while persisting
253 /// [`ChannelManager`].
257 /// This function panics if the background thread has panicked such as while persisting or
260 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
261 pub fn join(mut self) -> Result<(), std::io::Error> {
262 assert!(self.thread_handle.is_some());
266 /// Stop `BackgroundProcessor`'s thread, returning any error that occurred while persisting
267 /// [`ChannelManager`].
271 /// This function panics if the background thread has panicked such as while persisting or
274 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
275 pub fn stop(mut self) -> Result<(), std::io::Error> {
276 assert!(self.thread_handle.is_some());
277 self.stop_and_join_thread()
280 fn stop_and_join_thread(&mut self) -> Result<(), std::io::Error> {
281 self.stop_thread.store(true, Ordering::Release);
285 fn join_thread(&mut self) -> Result<(), std::io::Error> {
286 match self.thread_handle.take() {
287 Some(handle) => handle.join().unwrap(),
293 impl Drop for BackgroundProcessor {
295 self.stop_and_join_thread().unwrap();
301 use bitcoin::blockdata::block::BlockHeader;
302 use bitcoin::blockdata::constants::genesis_block;
303 use bitcoin::blockdata::transaction::{Transaction, TxOut};
304 use bitcoin::network::constants::Network;
305 use lightning::chain::{BestBlock, Confirm, chainmonitor};
306 use lightning::chain::channelmonitor::ANTI_REORG_DELAY;
307 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
308 use lightning::chain::transaction::OutPoint;
309 use lightning::get_event_msg;
310 use lightning::ln::channelmanager::{BREAKDOWN_TIMEOUT, ChainParameters, ChannelManager, SimpleArcChannelManager};
311 use lightning::ln::features::InitFeatures;
312 use lightning::ln::msgs::{ChannelMessageHandler, Init};
313 use lightning::ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor, IgnoringMessageHandler};
314 use lightning::routing::network_graph::{NetworkGraph, NetGraphMsgHandler};
315 use lightning::util::config::UserConfig;
316 use lightning::util::events::{Event, MessageSendEventsProvider, MessageSendEvent};
317 use lightning::util::ser::Writeable;
318 use lightning::util::test_utils;
319 use lightning_persister::FilesystemPersister;
321 use std::path::PathBuf;
322 use std::sync::{Arc, Mutex};
323 use std::time::Duration;
324 use super::{BackgroundProcessor, FRESHNESS_TIMER};
326 const EVENT_DEADLINE: u64 = 5 * FRESHNESS_TIMER;
328 #[derive(Clone, Eq, Hash, PartialEq)]
329 struct TestDescriptor{}
330 impl SocketDescriptor for TestDescriptor {
331 fn send_data(&mut self, _data: &[u8], _resume_read: bool) -> usize {
335 fn disconnect_socket(&mut self) {}
338 type ChainMonitor = chainmonitor::ChainMonitor<InMemorySigner, Arc<test_utils::TestChainSource>, Arc<test_utils::TestBroadcaster>, Arc<test_utils::TestFeeEstimator>, Arc<test_utils::TestLogger>, Arc<FilesystemPersister>>;
341 node: Arc<SimpleArcChannelManager<ChainMonitor, test_utils::TestBroadcaster, test_utils::TestFeeEstimator, test_utils::TestLogger>>,
342 net_graph_msg_handler: Option<Arc<NetGraphMsgHandler<Arc<test_utils::TestChainSource>, Arc<test_utils::TestLogger>>>>,
343 peer_manager: Arc<PeerManager<TestDescriptor, Arc<test_utils::TestChannelMessageHandler>, Arc<test_utils::TestRoutingMessageHandler>, Arc<test_utils::TestLogger>, IgnoringMessageHandler>>,
344 chain_monitor: Arc<ChainMonitor>,
345 persister: Arc<FilesystemPersister>,
346 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
347 logger: Arc<test_utils::TestLogger>,
348 best_block: BestBlock,
353 let data_dir = self.persister.get_data_dir();
354 match fs::remove_dir_all(data_dir.clone()) {
355 Err(e) => println!("Failed to remove test persister directory {}: {}", data_dir, e),
361 fn get_full_filepath(filepath: String, filename: String) -> String {
362 let mut path = PathBuf::from(filepath);
364 path.to_str().unwrap().to_string()
367 fn create_nodes(num_nodes: usize, persist_dir: String) -> Vec<Node> {
368 let mut nodes = Vec::new();
369 for i in 0..num_nodes {
370 let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))});
371 let fee_estimator = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) });
372 let chain_source = Arc::new(test_utils::TestChainSource::new(Network::Testnet));
373 let logger = Arc::new(test_utils::TestLogger::with_id(format!("node {}", i)));
374 let persister = Arc::new(FilesystemPersister::new(format!("{}_persister_{}", persist_dir, i)));
375 let seed = [i as u8; 32];
376 let network = Network::Testnet;
377 let genesis_block = genesis_block(network);
378 let now = Duration::from_secs(genesis_block.header.time as u64);
379 let keys_manager = Arc::new(KeysManager::new(&seed, now.as_secs(), now.subsec_nanos()));
380 let chain_monitor = Arc::new(chainmonitor::ChainMonitor::new(Some(chain_source.clone()), tx_broadcaster.clone(), logger.clone(), fee_estimator.clone(), persister.clone()));
381 let best_block = BestBlock::from_genesis(network);
382 let params = ChainParameters { network, best_block };
383 let manager = Arc::new(ChannelManager::new(fee_estimator.clone(), chain_monitor.clone(), tx_broadcaster.clone(), logger.clone(), keys_manager.clone(), UserConfig::default(), params));
384 let network_graph = NetworkGraph::new(genesis_block.header.block_hash());
385 let net_graph_msg_handler = Some(Arc::new(NetGraphMsgHandler::new(network_graph, Some(chain_source.clone()), logger.clone())));
386 let msg_handler = MessageHandler { chan_handler: Arc::new(test_utils::TestChannelMessageHandler::new()), route_handler: Arc::new(test_utils::TestRoutingMessageHandler::new() )};
387 let peer_manager = Arc::new(PeerManager::new(msg_handler, keys_manager.get_node_secret(), &seed, logger.clone(), IgnoringMessageHandler{}));
388 let node = Node { node: manager, net_graph_msg_handler, peer_manager, chain_monitor, persister, tx_broadcaster, logger, best_block };
392 for i in 0..num_nodes {
393 for j in (i+1)..num_nodes {
394 nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &Init { features: InitFeatures::known() });
395 nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &Init { features: InitFeatures::known() });
402 macro_rules! open_channel {
403 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
404 begin_open_channel!($node_a, $node_b, $channel_value);
405 let events = $node_a.node.get_and_clear_pending_events();
406 assert_eq!(events.len(), 1);
407 let (temporary_channel_id, tx) = handle_funding_generation_ready!(&events[0], $channel_value);
408 end_open_channel!($node_a, $node_b, temporary_channel_id, tx);
413 macro_rules! begin_open_channel {
414 ($node_a: expr, $node_b: expr, $channel_value: expr) => {{
415 $node_a.node.create_channel($node_b.node.get_our_node_id(), $channel_value, 100, 42, None).unwrap();
416 $node_b.node.handle_open_channel(&$node_a.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_a, MessageSendEvent::SendOpenChannel, $node_b.node.get_our_node_id()));
417 $node_a.node.handle_accept_channel(&$node_b.node.get_our_node_id(), InitFeatures::known(), &get_event_msg!($node_b, MessageSendEvent::SendAcceptChannel, $node_a.node.get_our_node_id()));
421 macro_rules! handle_funding_generation_ready {
422 ($event: expr, $channel_value: expr) => {{
424 &Event::FundingGenerationReady { temporary_channel_id, channel_value_satoshis, ref output_script, user_channel_id } => {
425 assert_eq!(channel_value_satoshis, $channel_value);
426 assert_eq!(user_channel_id, 42);
428 let tx = Transaction { version: 1 as i32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
429 value: channel_value_satoshis, script_pubkey: output_script.clone(),
431 (temporary_channel_id, tx)
433 _ => panic!("Unexpected event"),
438 macro_rules! end_open_channel {
439 ($node_a: expr, $node_b: expr, $temporary_channel_id: expr, $tx: expr) => {{
440 $node_a.node.funding_transaction_generated(&$temporary_channel_id, $tx.clone()).unwrap();
441 $node_b.node.handle_funding_created(&$node_a.node.get_our_node_id(), &get_event_msg!($node_a, MessageSendEvent::SendFundingCreated, $node_b.node.get_our_node_id()));
442 $node_a.node.handle_funding_signed(&$node_b.node.get_our_node_id(), &get_event_msg!($node_b, MessageSendEvent::SendFundingSigned, $node_a.node.get_our_node_id()));
446 fn confirm_transaction_depth(node: &mut Node, tx: &Transaction, depth: u32) {
448 let prev_blockhash = node.best_block.block_hash();
449 let height = node.best_block.height() + 1;
450 let header = BlockHeader { version: 0x20000000, prev_blockhash, merkle_root: Default::default(), time: height, bits: 42, nonce: 42 };
451 let txdata = vec![(0, tx)];
452 node.best_block = BestBlock::new(header.block_hash(), height);
455 node.node.transactions_confirmed(&header, &txdata, height);
456 node.chain_monitor.transactions_confirmed(&header, &txdata, height);
459 node.node.best_block_updated(&header, height);
460 node.chain_monitor.best_block_updated(&header, height);
466 fn confirm_transaction(node: &mut Node, tx: &Transaction) {
467 confirm_transaction_depth(node, tx, ANTI_REORG_DELAY);
471 fn test_background_processor() {
472 // Test that when a new channel is created, the ChannelManager needs to be re-persisted with
473 // updates. Also test that when new updates are available, the manager signals that it needs
474 // re-persistence and is successfully re-persisted.
475 let nodes = create_nodes(2, "test_background_processor".to_string());
477 // Go through the channel creation process so that each node has something to persist. Since
478 // open_channel consumes events, it must complete before starting BackgroundProcessor to
479 // avoid a race with processing events.
480 let tx = open_channel!(nodes[0], nodes[1], 100000);
482 // Initiate the background processors to watch each node.
483 let data_dir = nodes[0].persister.get_data_dir();
484 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);
485 let event_handler = |_: &_| {};
486 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());
488 macro_rules! check_persisted_data {
489 ($node: expr, $filepath: expr, $expected_bytes: expr) => {
490 match $node.write(&mut $expected_bytes) {
493 match std::fs::read($filepath) {
495 if bytes == $expected_bytes {
505 Err(e) => panic!("Unexpected error: {}", e)
510 // Check that the initial channel manager data is persisted as expected.
511 let filepath = get_full_filepath("test_background_processor_persister_0".to_string(), "manager".to_string());
512 let mut expected_bytes = Vec::new();
513 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
515 if !nodes[0].node.get_persistence_condvar_value() { break }
518 // Force-close the channel.
519 nodes[0].node.force_close_channel(&OutPoint { txid: tx.txid(), index: 0 }.to_channel_id()).unwrap();
521 // Check that the force-close updates are persisted.
522 let mut expected_bytes = Vec::new();
523 check_persisted_data!(nodes[0].node, filepath.clone(), expected_bytes);
525 if !nodes[0].node.get_persistence_condvar_value() { break }
528 assert!(bg_processor.stop().is_ok());
532 fn test_timer_tick_called() {
533 // Test that ChannelManager's and PeerManager's `timer_tick_occurred` is called every
534 // `FRESHNESS_TIMER`.
535 let nodes = create_nodes(1, "test_timer_tick_called".to_string());
536 let data_dir = nodes[0].persister.get_data_dir();
537 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);
538 let event_handler = |_: &_| {};
539 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());
541 let log_entries = nodes[0].logger.lines.lock().unwrap();
542 let desired_log = "Calling ChannelManager's timer_tick_occurred".to_string();
543 let second_desired_log = "Calling PeerManager's timer_tick_occurred".to_string();
544 if log_entries.get(&("lightning_background_processor".to_string(), desired_log)).is_some() &&
545 log_entries.get(&("lightning_background_processor".to_string(), second_desired_log)).is_some() {
550 assert!(bg_processor.stop().is_ok());
554 fn test_persist_error() {
555 // Test that if we encounter an error during manager persistence, the thread panics.
556 let nodes = create_nodes(2, "test_persist_error".to_string());
557 open_channel!(nodes[0], nodes[1], 100000);
559 let persister = |_: &_| Err(std::io::Error::new(std::io::ErrorKind::Other, "test"));
560 let event_handler = |_: &_| {};
561 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());
562 match bg_processor.join() {
563 Ok(_) => panic!("Expected error persisting manager"),
565 assert_eq!(e.kind(), std::io::ErrorKind::Other);
566 assert_eq!(e.get_ref().unwrap().to_string(), "test");
572 fn test_background_event_handling() {
573 let mut nodes = create_nodes(2, "test_background_event_handling".to_string());
574 let channel_value = 100000;
575 let data_dir = nodes[0].persister.get_data_dir();
576 let persister = move |node: &_| FilesystemPersister::persist_manager(data_dir.clone(), node);
578 // Set up a background event handler for FundingGenerationReady events.
579 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
580 let event_handler = move |event: &Event| {
581 sender.send(handle_funding_generation_ready!(event, channel_value)).unwrap();
583 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());
585 // Open a channel and check that the FundingGenerationReady event was handled.
586 begin_open_channel!(nodes[0], nodes[1], channel_value);
587 let (temporary_channel_id, funding_tx) = receiver
588 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
589 .expect("FundingGenerationReady not handled within deadline");
590 end_open_channel!(nodes[0], nodes[1], temporary_channel_id, funding_tx);
592 // Confirm the funding transaction.
593 confirm_transaction(&mut nodes[0], &funding_tx);
594 let as_funding = get_event_msg!(nodes[0], MessageSendEvent::SendFundingLocked, nodes[1].node.get_our_node_id());
595 confirm_transaction(&mut nodes[1], &funding_tx);
596 let bs_funding = get_event_msg!(nodes[1], MessageSendEvent::SendFundingLocked, nodes[0].node.get_our_node_id());
597 nodes[0].node.handle_funding_locked(&nodes[1].node.get_our_node_id(), &bs_funding);
598 let _as_channel_update = get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
599 nodes[1].node.handle_funding_locked(&nodes[0].node.get_our_node_id(), &as_funding);
600 let _bs_channel_update = get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
602 assert!(bg_processor.stop().is_ok());
604 // Set up a background event handler for SpendableOutputs events.
605 let (sender, receiver) = std::sync::mpsc::sync_channel(1);
606 let event_handler = move |event: &Event| sender.send(event.clone()).unwrap();
607 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());
609 // Force close the channel and check that the SpendableOutputs event was handled.
610 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id).unwrap();
611 let commitment_tx = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().pop().unwrap();
612 confirm_transaction_depth(&mut nodes[0], &commitment_tx, BREAKDOWN_TIMEOUT as u32);
614 .recv_timeout(Duration::from_secs(EVENT_DEADLINE))
615 .expect("SpendableOutputs not handled within deadline");
617 Event::SpendableOutputs { .. } => {},
618 Event::ChannelClosed { .. } => {},
619 _ => panic!("Unexpected event: {:?}", event),
622 assert!(bg_processor.stop().is_ok());