Merge pull request #1787 from wpaulino/async-event-handler

[rust-lightning] / lightning / src / chain / chainmonitor.rs

diff --git a/lightning/src/chain/chainmonitor.rs b/lightning/src/chain/chainmonitor.rs
index fc4caef8afd90f6fa68a2d0e43238732d4c04e6c..17fe69182ee81d060bc5c7c8c092608770104c84 100644 (file)
--- a/lightning/src/chain/chainmonitor.rs
+++ b/lightning/src/chain/chainmonitor.rs
@@ -36,7 +36,7 @@ use crate::util::atomic_counter::AtomicCounter;
 use crate::util::logger::Logger;
 use crate::util::errors::APIError;
 use crate::util::events;
-use crate::util::events::EventHandler;
+use crate::util::events::{Event, EventHandler};
 use crate::ln::channelmanager::ChannelDetails;
 
 use crate::prelude::*;
@@ -492,10 +492,28 @@ where C::Target: chain::Filter,
        pub fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
                use crate::util::events::EventsProvider;
                let events = core::cell::RefCell::new(Vec::new());
-               let event_handler = |event: &events::Event| events.borrow_mut().push(event.clone());
+               let event_handler = |event: events::Event| events.borrow_mut().push(event);
                self.process_pending_events(&event_handler);
                events.into_inner()
        }
+
+       /// Processes any events asynchronously in the order they were generated since the last call
+       /// using the given event handler.
+       ///
+       /// See the trait-level documentation of [`EventsProvider`] for requirements.
+       ///
+       /// [`EventsProvider`]: crate::util::events::EventsProvider
+       pub async fn process_pending_events_async<Future: core::future::Future, H: Fn(Event) -> Future>(
+               &self, handler: H
+       ) {
+               let mut pending_events = Vec::new();
+               for monitor_state in self.monitors.read().unwrap().values() {
+                       pending_events.append(&mut monitor_state.monitor.get_and_clear_pending_events());
+               }
+               for event in pending_events {
+                       handler(event).await;
+               }
+       }
 }
 
 impl<ChannelSigner: Sign, C: Deref, T: Deref, F: Deref, L: Deref, P: Deref>
@@ -736,8 +754,8 @@ impl<ChannelSigner: Sign, C: Deref, T: Deref, F: Deref, L: Deref, P: Deref> even
                for monitor_state in self.monitors.read().unwrap().values() {
                        pending_events.append(&mut monitor_state.monitor.get_and_clear_pending_events());
                }
-               for event in pending_events.drain(..) {
-                       handler.handle_event(&event);
+               for event in pending_events {
+                       handler.handle_event(event);
                }
        }
        #[cfg(anchors)]
@@ -759,8 +777,8 @@ impl<ChannelSigner: Sign, C: Deref, T: Deref, F: Deref, L: Deref, P: Deref> even
                for monitor_state in self.monitors.read().unwrap().values() {
                        pending_events.append(&mut monitor_state.monitor.get_and_clear_pending_events());
                }
-               for event in pending_events.drain(..) {
-                       handler.handle_event(&event);
+               for event in pending_events {
+                       handler.handle_event(event);
                }
        }
 }