Add attestation simulator

beacon_node/beacon_chain/src/attestation_simulator.rs

@@ -0,0 +1,93 @@
+use crate::{BeaconChain, BeaconChainTypes};
+use slog::{debug, error};
+use slot_clock::SlotClock;
+use std::sync::Arc;
+use task_executor::TaskExecutor;
+use tokio::time::sleep;
+use types::Slot;
+
+/// Spawns a routine which produces an unaggregated attestation at every slot.
+///
+/// This routine will run once per slot
+pub fn start_attestation_simulator_service<T: BeaconChainTypes>(
+    executor: TaskExecutor,
+    chain: Arc<BeaconChain<T>>,
+) {
+    executor.clone().spawn(
+        async move { attestation_simulator_service(executor, chain).await },
+        "attestation_simulator_service",
+    );
+}
+
+/// Loop indefinitely, calling `BeaconChain::produce_unaggregated_attestation` every 4s into each slot.
+async fn attestation_simulator_service<T: BeaconChainTypes>(
+    executor: TaskExecutor,
+    chain: Arc<BeaconChain<T>>,
+) {
+    let slot_duration = chain.slot_clock.slot_duration();
+    let additional_delay = slot_duration / 3;
+
+    loop {
+        match chain.slot_clock.duration_to_next_slot() {
+            Some(duration) => {
+                sleep(duration + additional_delay).await;
+
+                debug!(
+                    chain.log,
+                    "Simulating unagg. attestation production";
+                );
+
+                // Run the task in the executor
+                let inner_chain = chain.clone();
+                executor.spawn(
+                    async move {
+                        if let Ok(current_slot) = inner_chain.slot() {
+                            produce_unaggregated_attestation(inner_chain, current_slot);
+                        }
+                    },
+                    "attestation_simulator_service",
+                );
+            }
+            None => {
+                error!(chain.log, "Failed to read slot clock");
+                // If we can't read the slot clock, just wait another slot.
+                sleep(slot_duration).await;
+            }
+        };
+    }
+}
+
+pub fn produce_unaggregated_attestation<T: BeaconChainTypes>(
+    inner_chain: Arc<BeaconChain<T>>,
+    current_slot: Slot,
+) {
+    // Since attestations for different committees are practically identical (apart from the committee index field)
+    // Committee 0 is guaranteed to exist. That means there's no need to load the committee.
+    let beacon_committee_index = 0;
+
+    // Store the unaggregated attestation in the validator monitor for later processing
+    match inner_chain.produce_unaggregated_attestation(current_slot, beacon_committee_index) {
+        Ok(unaggregated_attestation) => {
+            let data = &unaggregated_attestation.data;
+
+            debug!(
+                inner_chain.log,
+                "Produce unagg. attestation";
+                "attestation_source" => data.source.root.to_string(),
+                "attestation_target" => data.target.root.to_string(),
+            );
+
+            inner_chain
+                .validator_monitor
+                .write()
+                .set_unaggregated_attestation(unaggregated_attestation);
+        }
+        Err(e) => {
+            debug!(
+                inner_chain.log,
+                "Failed to simulate attestation";
+                "error" => ?e
+            );
+        }
+    }
+}

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -3621,9 +3621,11 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         }
 
         // Allow the validator monitor to learn about a new valid state.
-        self.validator_monitor
-            .write()
-            .process_valid_state(current_slot.epoch(T::EthSpec::slots_per_epoch()), state);
+        self.validator_monitor.write().process_valid_state(
+            current_slot.epoch(T::EthSpec::slots_per_epoch()),
+            state,
+            &self.spec,
+        );
 
         let validator_monitor = self.validator_monitor.read();
 

beacon_node/beacon_chain/src/builder.rs

@@ -786,6 +786,7 @@ where
             validator_monitor.process_valid_state(
                 slot.epoch(TEthSpec::slots_per_epoch()),
                 &head_snapshot.beacon_state,
+                &self.spec,
             );
         }
 

beacon_node/beacon_chain/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod attestation_rewards;
+pub mod attestation_simulator;
 pub mod attestation_verification;
 mod attester_cache;
 pub mod beacon_block_reward;

beacon_node/beacon_chain/src/metrics.rs

@@ -10,6 +10,20 @@ use types::{BeaconState, Epoch, EthSpec, Hash256, Slot};
 /// The maximum time to wait for the snapshot cache lock during a metrics scrape.
 const SNAPSHOT_CACHE_TIMEOUT: Duration = Duration::from_millis(100);
 
+// Attestation simulator metrics
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_HIT_TOTAL: &str =
+    "validator_monitor_attestation_simulator_head_attester_hit_total";
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_MISS_TOTAL: &str =
+    "validator_monitor_attestation_simulator_head_attester_miss_total";
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_HIT_TOTAL: &str =
+    "validator_monitor_attestation_simulator_target_attester_hit_total";
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_MISS_TOTAL: &str =
+    "validator_monitor_attestation_simulator_target_attester_miss_total";
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_HIT_TOTAL: &str =
+    "validator_monitor_attestation_simulator_source_attester_hit_total";
+pub const VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_MISS_TOTAL: &str =
+    "validator_monitor_attestation_simulator_source_attester_miss_total";
+
 lazy_static! {
     /*
      * Block Processing
@@ -1041,6 +1055,48 @@ lazy_static! {
         "beacon_aggregated_attestation_subsets_total",
         "Count of new aggregated attestations that are subsets of already known aggregates"
     );
+    /*
+    * Attestation simulator metrics
+     */
+    pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_HIT: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_HIT_TOTAL,
+        "Incremented if a validator is flagged as a previous slot head attester \
+        during per slot processing",
+    );
+    pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_MISS: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_HEAD_ATTESTER_MISS_TOTAL,
+        "Incremented if a validator is not flagged as a previous slot head attester \
+        during per slot processing",
+    );
+    pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_HIT: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_HIT_TOTAL,
+        "Incremented if a validator is flagged as a previous slot target attester \
+        during per slot processing",
+    );
+    pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_MISS: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_TARGET_ATTESTER_MISS_TOTAL,
+        "Incremented if a validator is not flagged as a previous slot target attester \
+        during per slot processing",
+    );
+        pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_HIT: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_HIT_TOTAL,
+        "Incremented if a validator is flagged as a previous slot source attester \
+        during per slot processing",
+    );
+    pub static ref VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_MISS: Result<IntCounter> =
+    try_create_int_counter(
+        VALIDATOR_MONITOR_ATTESTATION_SIMULATOR_SOURCE_ATTESTER_MISS_TOTAL,
+        "Incremented if a validator is not flagged as a previous slot source attester \
+        during per slot processing",
+    );
+    /*
+     * Missed block metrics
+     */
     pub static ref VALIDATOR_MONITOR_MISSED_BLOCKS_TOTAL: Result<IntCounterVec> = try_create_int_counter_vec(
         "validator_monitor_missed_blocks_total",
         "Number of non-finalized blocks missed",