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Gloas set AttestationData.index (#9100)

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For gloas `attestation.data.index` should be set to 1 if we are attesting to a block whose slot is not the attestation duty slot and slot payload_status is `FULL`


  


Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com>

Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu>

Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com>
This commit is contained in:
Eitan Seri-Levi
2026-04-26 15:40:22 +02:00
committed by GitHub
parent 6323cd3827
commit 276c4d5ff3
6 changed files with 209 additions and 23 deletions
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26
beacon_node/beacon_chain/src/beacon_chain.rs
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@@ -1956,6 +1956,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
let beacon_block_root;
let beacon_state_root;
let target;
let is_same_slot_attestation;
let current_epoch_attesting_info: Option<(Checkpoint, usize)>;
let head_timer = metrics::start_timer(&metrics::ATTESTATION_PRODUCTION_HEAD_SCRAPE_SECONDS);
let head_span = debug_span!("attestation_production_head_scrape").entered();
@@ -1996,11 +1997,20 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
// When attesting to the head slot or later, always use the head of the chain.
beacon_block_root = head.beacon_block_root;
beacon_state_root = head.beacon_state_root();
is_same_slot_attestation = request_slot == head.beacon_block.slot();
} else {
// Permit attesting to slots *prior* to the current head. This is desirable when
// the VC and BN are out-of-sync due to time issues or overloading.
beacon_block_root = *head_state.get_block_root(request_slot)?;
beacon_state_root = *head_state.get_state_root(request_slot)?;
// Fetch the previous block root. If the previous block root equals
// the block root being attested to, the `request_slot` is a skipped slot
// and this is not a same slot attestation.
let prior_slot_root = head_state
.get_block_root(request_slot.saturating_sub(1u64))
.ok();
is_same_slot_attestation = prior_slot_root != Some(&beacon_block_root);
};
let target_slot = request_epoch.start_slot(T::EthSpec::slots_per_epoch());
@@ -2090,6 +2100,21 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
)
};
// For gloas the attestation data index indicates payload presence:
// `payload_present=false` for same-slot attestations or when payload not received.
// `payload_present=true` when attesting to a prior slot whose payload has been received.
let payload_present = if self
.spec
.fork_name_at_slot::<T::EthSpec>(request_slot)
.gloas_enabled()
&& !is_same_slot_attestation
{
self.canonical_head
.block_has_canonical_payload(&beacon_block_root, &self.spec)?
} else {
false
};
Ok(Attestation::<T::EthSpec>::empty_for_signing(
request_index,
committee_len,
@@ -2097,6 +2122,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
beacon_block_root,
justified_checkpoint,
target,
payload_present,
&self.spec,
)?)
}