Update lightning-background-processor to ping every five seconds

This updates lightning-background-processor calls to
PeerManager::timer_tick_occurred to match the new suggested rate in
the documentation.

Author: TheBlueMatt

lightning-background-processor/src/lib.rs

@@ -49,6 +49,8 @@ const FRESHNESS_TIMER: u64 = 60;
 #[cfg(test)]
 const FRESHNESS_TIMER: u64 = 1;
 
+const PING_TIMER: u64 = 5;
+
 /// Trait which handles persisting a [`ChannelManager`] to disk.
 ///
 /// [`ChannelManager`]: lightning::ln::channelmanager::ChannelManager
@@ -137,7 +139,8 @@ impl BackgroundProcessor {
 		let stop_thread = Arc::new(AtomicBool::new(false));
 		let stop_thread_clone = stop_thread.clone();
 		let handle = thread::spawn(move || -> Result<(), std::io::Error> {
-			let mut current_time = Instant::now();
+			let mut last_freshness_call = Instant::now();
+			let mut last_ping_call = Instant::now();
 			loop {
 				peer_manager.process_events();
 				channel_manager.process_pending_events(&event_handler);
@@ -152,11 +155,15 @@ impl BackgroundProcessor {
 					log_trace!(logger, "Terminating background processor.");
 					return Ok(());
 				}
-				if current_time.elapsed().as_secs() > FRESHNESS_TIMER {
-					log_trace!(logger, "Calling ChannelManager's and PeerManager's timer_tick_occurred");
+				if last_freshness_call.elapsed().as_secs() > FRESHNESS_TIMER {
+					log_trace!(logger, "Calling ChannelManager's timer_tick_occurred");
 					channel_manager.timer_tick_occurred();
+					last_freshness_call = Instant::now();
+				}
+				if last_ping_call.elapsed().as_secs() > PING_TIMER {
+					log_trace!(logger, "Calling PeerManager's timer_tick_occurred");
 					peer_manager.timer_tick_occurred();
-					current_time = Instant::now();
+					last_ping_call = Instant::now();
 				}
 			}
 		});