From 221bfa6bd427ca34c052899a54e945c3a8903b02 Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Mon, 10 Dec 2018 22:47:21 -0500 Subject: [PATCH] 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. --- fuzz/fuzz_targets/full_stack_target.rs | 3 ++- src/ln/channelmanager.rs | 37 +++++++++++++++++++------- 2 files changed, 30 insertions(+), 10 deletions(-) diff --git a/fuzz/fuzz_targets/full_stack_target.rs b/fuzz/fuzz_targets/full_stack_target.rs index 0524f578..0e73a69f 100644 --- 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()) }); 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&(Arc::clone(&logger) as Arc)); @@ -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 c2082f6e..7d6ef794 100644 --- 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 { + // 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 { + // 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(); } -- 2.30.2