add get_payload_attestation_endpoint

Author: shane-moore

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2067,6 +2067,45 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         )?)
     }
 
+    /// Produce a `PayloadAttestationData` for a PTC validator to sign.
+    ///
+    /// This is used by PTC (Payload Timeliness Committee) validators to attest to the
+    /// presence/absence of an execution payload and blobs for a given slot.
+    pub fn produce_payload_attestation_data(
+        &self,
+        request_slot: Slot,
+    ) -> Result<PayloadAttestationData, Error> {
+        let _timer = metrics::start_timer(&metrics::PAYLOAD_ATTESTATION_PRODUCTION_SECONDS);
+
+        // Payload attestations are only valid for the current slot
+        let current_slot = self.slot()?;
+        if request_slot != current_slot {
+            return Err(Error::InvalidSlot(request_slot));
+        }
+
+        // Check if we've seen a block for this slot from the canonical head
+        let head = self.head_snapshot();
+        if head.beacon_block.slot() != request_slot {
+            return Err(Error::NoBlockForSlot(request_slot));
+        }
+
+        let beacon_block_root = head.beacon_block_root;
+
+        // TODO(EIP-7732): Check if we've seen a SignedExecutionPayloadEnvelope
+        // referencing this block root. For now, default to false.
+        let payload_present = false;
+
+        // TODO(EIP-7732): Check blob data availability. For now, default to false.
+        let blob_data_available = false;
+
+        Ok(PayloadAttestationData {
+            beacon_block_root,
+            slot: head.beacon_block.slot(),
+            payload_present,
+            blob_data_available,
+        })
+    }
+
     /// Performs the same validation as `Self::verify_unaggregated_attestation_for_gossip`, but for
     /// multiple attestations using batch BLS verification. Batch verification can provide
     /// significant CPU-time savings compared to individual verification.

beacon_node/beacon_chain/src/errors.rs

@@ -53,6 +53,7 @@ pub enum BeaconChainError {
     },
     SlotClockDidNotStart,
     NoStateForSlot(Slot),
+    NoBlockForSlot(Slot),
     BeaconStateError(BeaconStateError),
     EpochCacheError(EpochCacheError),
     DBInconsistent(String),

beacon_node/beacon_chain/src/metrics.rs

@@ -497,6 +497,17 @@ pub static ATTESTATION_PRODUCTION_CACHE_PRIME_SECONDS: LazyLock<Result<Histogram
         )
     });
 
+/*
+ * Payload Attestation Production
+ */
+pub static PAYLOAD_ATTESTATION_PRODUCTION_SECONDS: LazyLock<Result<Histogram>> =
+    LazyLock::new(|| {
+        try_create_histogram(
+            "beacon_payload_attestation_production_seconds",
+            "Full runtime of payload attestation production",
+        )
+    });
+
 /*
  * Fork Choice
  */

beacon_node/http_api/src/lib.rs

@@ -2456,6 +2456,46 @@ pub fn serve<T: BeaconChainTypes>(
         task_spawner_filter.clone(),
     );
 
+    // GET validator/payload_attestation_data/{slot}
+    let get_validator_payload_attestation_data = eth_v1
+        .clone()
+        .and(warp::path("validator"))
+        .and(warp::path("payload_attestation_data"))
+        .and(warp::path::param::<Slot>().or_else(|_| async {
+            Err(warp_utils::reject::custom_bad_request(
+                "Invalid slot".to_string(),
+            ))
+        }))
+        .and(warp::path::end())
+        .and(not_while_syncing_filter.clone())
+        .and(task_spawner_filter.clone())
+        .and(chain_filter.clone())
+        .then(
+            |slot: Slot,
+             not_synced_filter: Result<(), Rejection>,
+             task_spawner: TaskSpawner<T::EthSpec>,
+             chain: Arc<BeaconChain<T>>| {
+                task_spawner.blocking_response_task(Priority::P0, move || {
+                    not_synced_filter?;
+
+                    let fork_name = chain.spec.fork_name_at_slot::<T::EthSpec>(slot);
+
+                    let payload_attestation_data = chain
+                        .produce_payload_attestation_data(slot)
+                        .map_err(warp_utils::reject::unhandled_error)?;
+
+                    Ok(add_consensus_version_header(
+                        warp::reply::json(&beacon_response(
+                            ResponseIncludesVersion::Yes(fork_name),
+                            payload_attestation_data,
+                        ))
+                        .into_response(),
+                        fork_name,
+                    ))
+                })
+            },
+        );
+
     // GET validator/aggregate_attestation?attestation_data_root,slot
     let get_validator_aggregate_attestation = get_validator_aggregate_attestation(
         any_version.clone().clone(),
@@ -3307,6 +3347,7 @@ pub fn serve<T: BeaconChainTypes>(
                 .uor(get_validator_blocks)
                 .uor(get_validator_blinded_blocks)
                 .uor(get_validator_attestation_data)
+                .uor(get_validator_payload_attestation_data)
                 .uor(get_validator_aggregate_attestation)
                 .uor(get_validator_sync_committee_contribution)
                 .uor(get_lighthouse_health)

beacon_node/http_api/tests/tests.rs

@@ -4072,6 +4072,54 @@ impl ApiTester {
         self
     }
 
+    pub async fn test_get_validator_payload_attestation_data(self) -> Self {
+        let slot = self.chain.slot().unwrap();
+        let fork_name = self.chain.spec.fork_name_at_slot::<E>(slot);
+
+        // Payload attestation data is only available in Gloas fork.
+        if !fork_name.gloas_enabled() {
+            return self;
+        }
+
+        let result = self
+            .client
+            .get_validator_payload_attestation_data(slot)
+            .await
+            .unwrap()
+            .into_data();
+
+        let expected = self.chain.produce_payload_attestation_data(slot).unwrap();
+
+        assert_eq!(result.beacon_block_root, expected.beacon_block_root);
+        assert_eq!(result.slot, expected.slot);
+        assert_eq!(result.payload_present, expected.payload_present);
+        assert_eq!(result.blob_data_available, expected.blob_data_available);
+
+        self
+    }
+
+    pub async fn test_get_validator_payload_attestation_data_pre_gloas(self) -> Self {
+        let slot = self.chain.slot().unwrap();
+        let fork_name = self.chain.spec.fork_name_at_slot::<E>(slot);
+
+        // This test is for pre-Gloas forks
+        if fork_name.gloas_enabled() {
+            return self;
+        }
+
+        // The endpoint should return a 400 error for pre-Gloas forks
+        match self
+            .client
+            .get_validator_payload_attestation_data(slot)
+            .await
+        {
+            Ok(result) => panic!("query for pre-Gloas slot should fail, got: {result:?}"),
+            Err(e) => assert_eq!(e.status().unwrap(), 400),
+        }
+
+        self
+    }
+
     #[allow(clippy::await_holding_lock)] // This is a test, so it should be fine.
     pub async fn test_get_validator_aggregate_attestation_v1(self) -> Self {
         let attestation = self
@@ -7552,6 +7600,27 @@ async fn get_validator_attestation_data_with_skip_slots() {
         .await;
 }
 
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn get_validator_payload_attestation_data() {
+    // TODO(EIP-7732): Remove this conditional once gloas block production is implemented
+    if fork_name_from_env().map_or(false, |f| f.gloas_enabled()) {
+        return;
+    }
+
+    ApiTester::new_with_hard_forks()
+        .await
+        .test_get_validator_payload_attestation_data()
+        .await;
+}
+
+#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+async fn get_validator_payload_attestation_data_pre_gloas() {
+    ApiTester::new()
+        .await
+        .test_get_validator_payload_attestation_data_pre_gloas()
+        .await;
+}
+
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
 async fn get_validator_aggregate_attestation_v1() {
     ApiTester::new()

common/eth2/src/lib.rs

@@ -46,6 +46,7 @@ use ssz::Encode;
 use std::fmt;
 use std::future::Future;
 use std::time::Duration;
+use types::PayloadAttestationData;
 
 pub const V1: EndpointVersion = EndpointVersion(1);
 pub const V2: EndpointVersion = EndpointVersion(2);
@@ -76,6 +77,7 @@ const HTTP_GET_BEACON_BLOCK_SSZ_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_GET_DEBUG_BEACON_STATE_QUOTIENT: u32 = 4;
 const HTTP_GET_DEPOSIT_SNAPSHOT_QUOTIENT: u32 = 4;
 const HTTP_GET_VALIDATOR_BLOCK_TIMEOUT_QUOTIENT: u32 = 4;
+const HTTP_PAYLOAD_ATTESTATION_TIMEOUT_QUOTIENT: u32 = 4;
 const HTTP_DEFAULT_TIMEOUT_QUOTIENT: u32 = 4;
 
 /// A struct to define a variety of different timeouts for different validator tasks to ensure
@@ -96,6 +98,7 @@ pub struct Timeouts {
     pub get_debug_beacon_states: Duration,
     pub get_deposit_snapshot: Duration,
     pub get_validator_block: Duration,
+    pub payload_attestation: Duration,
     pub default: Duration,
 }
 
@@ -116,6 +119,7 @@ impl Timeouts {
             get_debug_beacon_states: timeout,
             get_deposit_snapshot: timeout,
             get_validator_block: timeout,
+            payload_attestation: timeout,
             default: timeout,
         }
     }
@@ -138,6 +142,7 @@ impl Timeouts {
             get_debug_beacon_states: base_timeout / HTTP_GET_DEBUG_BEACON_STATE_QUOTIENT,
             get_deposit_snapshot: base_timeout / HTTP_GET_DEPOSIT_SNAPSHOT_QUOTIENT,
             get_validator_block: base_timeout / HTTP_GET_VALIDATOR_BLOCK_TIMEOUT_QUOTIENT,
+            payload_attestation: base_timeout / HTTP_PAYLOAD_ATTESTATION_TIMEOUT_QUOTIENT,
             default: base_timeout / HTTP_DEFAULT_TIMEOUT_QUOTIENT,
         }
     }
@@ -2555,6 +2560,24 @@ impl BeaconNodeHttpClient {
         self.get_with_timeout(path, self.timeouts.attestation).await
     }
 
+    /// `GET validator/payload_attestation_data/{slot}`
+    pub async fn get_validator_payload_attestation_data(
+        &self,
+        slot: Slot,
+    ) -> Result<BeaconResponse<PayloadAttestationData>, Error> {
+        let mut path = self.eth_path(V1)?;
+
+        path.path_segments_mut()
+            .map_err(|()| Error::InvalidUrl(self.server.clone()))?
+            .push("validator")
+            .push("payload_attestation_data")
+            .push(&slot.to_string());
+
+        self.get_with_timeout(path, self.timeouts.payload_attestation)
+            .await
+            .map(BeaconResponse::ForkVersioned)
+    }
+
     /// `GET v1/validator/aggregate_attestation?slot,attestation_data_root`
     pub async fn get_validator_aggregate_attestation_v1<E: EthSpec>(
         &self,