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Gloas consensus logic for attestations (#8760)

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Co-Authored-By: Michael Sproul <michael@sigmaprime.io>
This commit is contained in:
Michael Sproul
2026-02-09 16:26:34 +11:00
committed by GitHub
parent b8d098685f
commit f8cfaa4251
8 changed files with 219 additions and 14 deletions
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44
consensus/state_processing/src/common/get_attestation_participation.rs
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@@ -1,8 +1,8 @@
use integer_sqrt::IntegerSquareRoot;
use safe_arith::SafeArith;
use smallvec::SmallVec;
use types::{AttestationData, BeaconState, ChainSpec, EthSpec};
use types::{
BeaconStateError as Error,
AttestationData, BeaconState, BeaconStateError as Error, ChainSpec, EthSpec,
consts::altair::{
NUM_FLAG_INDICES, TIMELY_HEAD_FLAG_INDEX, TIMELY_SOURCE_FLAG_INDEX,
TIMELY_TARGET_FLAG_INDEX,
@@ -16,6 +16,8 @@ use types::{
///
/// This function will return an error if the source of the attestation doesn't match the
/// state's relevant justified checkpoint.
///
/// This function has been abstracted to work for all forks from Altair to Gloas.
pub fn get_attestation_participation_flag_indices<E: EthSpec>(
state: &BeaconState<E>,
data: &AttestationData,
@@ -27,13 +29,43 @@ pub fn get_attestation_participation_flag_indices<E: EthSpec>(
} else {
state.previous_justified_checkpoint()
};
// Matching roots.
let is_matching_source = data.source == justified_checkpoint;
// Matching target.
let is_matching_target = is_matching_source
&& data.target.root == *state.get_block_root_at_epoch(data.target.epoch)?;
let is_matching_head =
is_matching_target && data.beacon_block_root == *state.get_block_root(data.slot)?;
// [New in Gloas:EIP7732]
let payload_matches = if state.fork_name_unchecked().gloas_enabled() {
if state.is_attestation_same_slot(data)? {
// For same-slot attestations, data.index must be 0
if data.index != 0 {
return Err(Error::BadOverloadedDataIndex(data.index));
}
true
} else {
// For non same-slot attestations, check execution payload availability
let slot_index = data
.slot
.as_usize()
.safe_rem(E::slots_per_historical_root())?;
let payload_index = state
.execution_payload_availability()?
.get(slot_index)
.map(|avail| if avail { 1 } else { 0 })
.map_err(|_| Error::InvalidExecutionPayloadAvailabilityIndex(slot_index))?;
data.index == payload_index
}
} else {
// Essentially `payload_matches` is always true pre-Gloas (it is not considered for matching
// head).
true
};
// Matching head.
let is_matching_head = is_matching_target
&& data.beacon_block_root == *state.get_block_root(data.slot)?
&& payload_matches;
if !is_matching_source {
return Err(Error::IncorrectAttestationSource);