Proposer and attester slashing sse events (#5327)

* default vc to block v3 endpoint and deprecate block-v3 flag

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into unstable

* add proposer and attester event variants

* add TOOOs

* add tests, event triggers

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into proposer-and-attester-slashing-sse-events

* revert

* revert

* remove double event tracking

* Merge branch 'unstable' into proposer-and-attester-slashing-sse-events

* remove todo, fix test

* resolve merge conflicts

* Merge branch 'proposer-and-attester-slashing-sse-events' of https://github.com/eserilev/lighthouse into proposer-and-attester-slashing-sse-events

* leftover debugging

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into proposer-and-attester-slashing-sse-events

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into proposer-and-attester-slashing-sse-events

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2422,6 +2422,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         proposer_slashing: ProposerSlashing,
     ) -> Result<ObservationOutcome<ProposerSlashing, T::EthSpec>, Error> {
         let wall_clock_state = self.wall_clock_state()?;
+
         Ok(self.observed_proposer_slashings.lock().verify_and_observe(
             proposer_slashing,
             &wall_clock_state,
@@ -2434,6 +2435,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         &self,
         proposer_slashing: SigVerifiedOp<ProposerSlashing, T::EthSpec>,
     ) {
+        if let Some(event_handler) = self.event_handler.as_ref() {
+            if event_handler.has_proposer_slashing_subscribers() {
+                event_handler.register(EventKind::ProposerSlashing(Box::new(
+                    proposer_slashing.clone().into_inner(),
+                )));
+            }
+        }
+
         if self.eth1_chain.is_some() {
             self.op_pool.insert_proposer_slashing(proposer_slashing)
         }
@@ -2445,6 +2454,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         attester_slashing: AttesterSlashing<T::EthSpec>,
     ) -> Result<ObservationOutcome<AttesterSlashing<T::EthSpec>, T::EthSpec>, Error> {
         let wall_clock_state = self.wall_clock_state()?;
+
         Ok(self.observed_attester_slashings.lock().verify_and_observe(
             attester_slashing,
             &wall_clock_state,
@@ -2465,6 +2475,14 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
             .fork_choice_write_lock()
             .on_attester_slashing(attester_slashing.as_inner());
 
+        if let Some(event_handler) = self.event_handler.as_ref() {
+            if event_handler.has_attester_slashing_subscribers() {
+                event_handler.register(EventKind::AttesterSlashing(Box::new(
+                    attester_slashing.clone().into_inner(),
+                )));
+            }
+        }
+
         // Add to the op pool (if we have the ability to propose blocks).
         if self.eth1_chain.is_some() {
             self.op_pool.insert_attester_slashing(attester_slashing)

beacon_node/beacon_chain/src/builder.rs

@@ -708,8 +708,8 @@ where
             .ok_or("Cannot build without a genesis state root")?;
         let validator_monitor_config = self.validator_monitor_config.unwrap_or_default();
         let head_tracker = Arc::new(self.head_tracker.unwrap_or_default());
-
         let beacon_proposer_cache: Arc<Mutex<BeaconProposerCache>> = <_>::default();
+
         let mut validator_monitor = ValidatorMonitor::new(
             validator_monitor_config,
             beacon_proposer_cache.clone(),

beacon_node/beacon_chain/src/events.rs

@@ -20,6 +20,8 @@ pub struct ServerSentEventHandler<E: EthSpec> {
     light_client_finality_update_tx: Sender<EventKind<E>>,
     light_client_optimistic_update_tx: Sender<EventKind<E>>,
     block_reward_tx: Sender<EventKind<E>>,
+    proposer_slashing_tx: Sender<EventKind<E>>,
+    attester_slashing_tx: Sender<EventKind<E>>,
     log: Logger,
 }
 
@@ -45,6 +47,8 @@ impl<E: EthSpec> ServerSentEventHandler<E> {
         let (light_client_finality_update_tx, _) = broadcast::channel(capacity);
         let (light_client_optimistic_update_tx, _) = broadcast::channel(capacity);
         let (block_reward_tx, _) = broadcast::channel(capacity);
+        let (proposer_slashing_tx, _) = broadcast::channel(capacity);
+        let (attester_slashing_tx, _) = broadcast::channel(capacity);
 
         Self {
             attestation_tx,
@@ -60,6 +64,8 @@ impl<E: EthSpec> ServerSentEventHandler<E> {
             light_client_finality_update_tx,
             light_client_optimistic_update_tx,
             block_reward_tx,
+            proposer_slashing_tx,
+            attester_slashing_tx,
             log,
         }
     }
@@ -126,6 +132,14 @@ impl<E: EthSpec> ServerSentEventHandler<E> {
                 .block_reward_tx
                 .send(kind)
                 .map(|count| log_count("block reward", count)),
+            EventKind::ProposerSlashing(_) => self
+                .proposer_slashing_tx
+                .send(kind)
+                .map(|count| log_count("proposer slashing", count)),
+            EventKind::AttesterSlashing(_) => self
+                .attester_slashing_tx
+                .send(kind)
+                .map(|count| log_count("attester slashing", count)),
         };
         if let Err(SendError(event)) = result {
             trace!(self.log, "No receivers registered to listen for event"; "event" => ?event);
@@ -184,6 +198,14 @@ impl<E: EthSpec> ServerSentEventHandler<E> {
         self.block_reward_tx.subscribe()
     }
 
+    pub fn subscribe_attester_slashing(&self) -> Receiver<EventKind<E>> {
+        self.attester_slashing_tx.subscribe()
+    }
+
+    pub fn subscribe_proposer_slashing(&self) -> Receiver<EventKind<E>> {
+        self.proposer_slashing_tx.subscribe()
+    }
+
     pub fn has_attestation_subscribers(&self) -> bool {
         self.attestation_tx.receiver_count() > 0
     }
@@ -227,4 +249,12 @@ impl<E: EthSpec> ServerSentEventHandler<E> {
     pub fn has_block_reward_subscribers(&self) -> bool {
         self.block_reward_tx.receiver_count() > 0
     }
+
+    pub fn has_proposer_slashing_subscribers(&self) -> bool {
+        self.proposer_slashing_tx.receiver_count() > 0
+    }
+
+    pub fn has_attester_slashing_subscribers(&self) -> bool {
+        self.attester_slashing_tx.receiver_count() > 0
+    }
 }