Move monitor-generated HTLC event handling to manager event-getters

This is somewhat awkward, but prevents a slew of duplicate events.
Really this should probably be more explicit, but would be easy to
move that along with a slew of block_connected-event-processing
refactors, see-also GH #80.

This affects full_stack_target only on accident cause the demo test
didn't continue onwards with another block connection.

diff --git a/fuzz/fuzz_targets/full_stack_target.rs b/fuzz/fuzz_targets/full_stack_target.rs
index 0524f578e45064cbcd199c87a895b52797666ccf..0e73a69f81c99e13bfdc0002e5668803bc65e3b6 100644 (file)
--- a/fuzz/fuzz_targets/full_stack_target.rs
+++ b/fuzz/fuzz_targets/full_stack_target.rs
@@ -833,6 +833,7 @@ mod tests {
                // 00fd - A feerate request (returning min feerate, which our open_channel also uses)
                // 0c005e - connect a block with one transaction of len 94
                // 0200000001ec00000000000000000000000000000000000000000000000000000000000000000000000000000000014f00000000000000220020f60000000000000000000000000000000000000000000000000000000000000000000000 - the funding transaction
+               // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate)
 
                let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) });
                super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<Logger>));
@@ -846,6 +847,6 @@ mod tests {
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 with 0 adds, 0 fulfills, 0 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&3)); // 6
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030200000000000000000000000000000000000000000000000000000000000000 with 1 adds, 0 fulfills, 0 fails for channel 3f00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&3)); // 7
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 with 0 adds, 1 fulfills, 0 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 8
-               assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 with 0 adds, 0 fulfills, 1 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 9
+               assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000000 with 0 adds, 0 fulfills, 1 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&2)); // 9
        }
 }

diff --git a/src/ln/channelmanager.rs b/src/ln/channelmanager.rs
index c2082f6ee1cb8be9a3d678b8f727c950b0012f65..7d6ef794b90aa38ccfb0ac29c4af2687a94e95e2 100644 (file)
--- a/src/ln/channelmanager.rs
+++ b/src/ln/channelmanager.rs
@@ -2622,6 +2622,20 @@ impl ChannelManager {
 
 impl events::MessageSendEventsProvider for ChannelManager {
        fn get_and_clear_pending_msg_events(&self) -> Vec<events::MessageSendEvent> {
+               // TODO: Event release to users and serialization is currently race-y: its very easy for a
+               // user to serialize a ChannelManager with pending events in it and lose those events on
+               // restart. This is doubly true for the fail/fulfill-backs from monitor events!
+               {
+                       //TODO: This behavior should be documented.
+                       for htlc_update in self.monitor.fetch_pending_htlc_updated() {
+                               if let Some(preimage) = htlc_update.payment_preimage {
+                                       self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
+                               } else {
+                                       self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
+                               }
+                       }
+               }
+
                let mut ret = Vec::new();
                let mut channel_state = self.channel_state.lock().unwrap();
                mem::swap(&mut ret, &mut channel_state.pending_msg_events);
@@ -2631,6 +2645,20 @@ impl events::MessageSendEventsProvider for ChannelManager {
 
 impl events::EventsProvider for ChannelManager {
        fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
+               // TODO: Event release to users and serialization is currently race-y: its very easy for a
+               // user to serialize a ChannelManager with pending events in it and lose those events on
+               // restart. This is doubly true for the fail/fulfill-backs from monitor events!
+               {
+                       //TODO: This behavior should be documented.
+                       for htlc_update in self.monitor.fetch_pending_htlc_updated() {
+                               if let Some(preimage) = htlc_update.payment_preimage {
+                                       self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
+                               } else {
+                                       self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
+                               }
+                       }
+               }
+
                let mut ret = Vec::new();
                let mut pending_events = self.pending_events.lock().unwrap();
                mem::swap(&mut ret, &mut *pending_events);
@@ -2711,15 +2739,6 @@ impl ChainListener for ChannelManager {
                for failure in failed_channels.drain(..) {
                        self.finish_force_close_channel(failure);
                }
-               {
-                       for htlc_update in self.monitor.fetch_pending_htlc_updated() {
-                               if let Some(preimage) = htlc_update.payment_preimage {
-                                       self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
-                               } else {
-                                       self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
-                               }
-                       }
-               }
                self.latest_block_height.store(height as usize, Ordering::Release);
                *self.last_block_hash.try_lock().expect("block_(dis)connected must not be called in parallel") = header.bitcoin_hash();
        }