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EIP7549 compute_on_chain_aggregate #5685

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EIP7549 compute_on_chain_aggregate #5685

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1af04b3
get attesting indices electra impl
eserilev May 6, 2024
ed1cfcf
fmt
eserilev May 6, 2024
d455c1d
get tests to pass
eserilev May 7, 2024
1a7854e
fmt
eserilev May 7, 2024
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139 changes: 102 additions & 37 deletions beacon_node/beacon_chain/src/attestation_verification.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -40,12 +40,13 @@ use crate::{
BeaconChain, BeaconChainError, BeaconChainTypes,
};
use bls::verify_signature_sets;
use itertools::Itertools;
use proto_array::Block as ProtoBlock;
use slog::debug;
use slot_clock::SlotClock;
use state_processing::{
common::get_indexed_attestation,
per_block_processing::errors::AttestationValidationError,
common::{attesting_indices_base, attesting_indices_electra},
per_block_processing::errors::{AttestationValidationError, BlockOperationError},
signature_sets::{
indexed_attestation_signature_set_from_pubkeys,
signed_aggregate_selection_proof_signature_set, signed_aggregate_signature_set,
Expand All @@ -55,8 +56,9 @@ use std::borrow::Cow;
use strum::AsRefStr;
use tree_hash::TreeHash;
use types::{
Attestation, AttestationRef, BeaconCommittee, ChainSpec, CommitteeIndex, Epoch, EthSpec,
ForkName, Hash256, IndexedAttestation, SelectionProof, SignedAggregateAndProof, Slot, SubnetId,
Attestation, AttestationRef, BeaconCommittee, BeaconStateError::NoCommitteeFound, ChainSpec,
CommitteeIndex, Epoch, EthSpec, ForkName, Hash256, IndexedAttestation, SelectionProof,
SignedAggregateAndProof, Slot, SubnetId,
};

pub use batch::{batch_verify_aggregated_attestations, batch_verify_unaggregated_attestations};
Expand Down Expand Up @@ -545,32 +547,59 @@ impl<'a, T: BeaconChainTypes> IndexedAggregatedAttestation<'a, T> {
};

let get_indexed_attestation_with_committee =
|(committee, _): (BeaconCommittee, CommitteesPerSlot)| {
// Note: this clones the signature which is known to be a relatively slow operation.
//
// Future optimizations should remove this clone.
let selection_proof =
SelectionProof::from(signed_aggregate.message().selection_proof().clone());

if !selection_proof
.is_aggregator(committee.committee.len(), &chain.spec)
.map_err(|e| Error::BeaconChainError(e.into()))?
{
return Err(Error::InvalidSelectionProof { aggregator_index });
}

// Ensure the aggregator is a member of the committee for which it is aggregating.
if !committee.committee.contains(&(aggregator_index as usize)) {
return Err(Error::AggregatorNotInCommittee { aggregator_index });
|(committees, _): (Vec<BeaconCommittee>, CommitteesPerSlot)| {
match attestation {
AttestationRef::Base(att) => {
let committee = committees
.iter()
.filter(|&committee| committee.index == att.data.index)
.at_most_one()
.map_err(|_| Error::NoCommitteeForSlotAndIndex {
slot: att.data.slot,
index: att.data.index,
})?;

if let Some(committee) = committee {
// Note: this clones the signature which is known to be a relatively slow operation.
//
// Future optimizations should remove this clone.
let selection_proof = SelectionProof::from(
signed_aggregate.message().selection_proof().clone(),
);

if !selection_proof
.is_aggregator(committee.committee.len(), &chain.spec)
.map_err(|e| Error::BeaconChainError(e.into()))?
{
return Err(Error::InvalidSelectionProof { aggregator_index });
}

// Ensure the aggregator is a member of the committee for which it is aggregating.
if !committee.committee.contains(&(aggregator_index as usize)) {
return Err(Error::AggregatorNotInCommittee { aggregator_index });
}
attesting_indices_base::get_indexed_attestation(
committee.committee,
att,
)
.map_err(|e| BeaconChainError::from(e).into())
} else {
Err(Error::NoCommitteeForSlotAndIndex {
slot: att.data.slot,
index: att.data.index,
})
}
}
AttestationRef::Electra(att) => {
attesting_indices_electra::get_indexed_attestation(&committees, att)
.map_err(|e| BeaconChainError::from(e).into())
}
}

get_indexed_attestation(committee.committee, attestation)
.map_err(|e| BeaconChainError::from(e).into())
};

let indexed_attestation = match map_attestation_committee(
let indexed_attestation = match map_attestation_committees(
chain,
attestation,
&attestation,
get_indexed_attestation_with_committee,
) {
Ok(indexed_attestation) => indexed_attestation,
Expand Down Expand Up @@ -1252,13 +1281,49 @@ pub fn obtain_indexed_attestation_and_committees_per_slot<T: BeaconChainTypes>(
chain: &BeaconChain<T>,
attestation: AttestationRef<T::EthSpec>,
) -> Result<(IndexedAttestation<T::EthSpec>, CommitteesPerSlot), Error> {
map_attestation_committee(chain, attestation, |(committee, committees_per_slot)| {
get_indexed_attestation(committee.committee, attestation)
.map(|attestation| (attestation, committees_per_slot))
.map_err(Error::Invalid)
map_attestation_committees(chain, &attestation, |(committees, committees_per_slot)| {
match attestation {
AttestationRef::Base(att) => {
let committee = committees
.iter()
.filter(|&committee| committee.index == att.data.index)
.at_most_one()
.map_err(|_| Error::NoCommitteeForSlotAndIndex {
slot: att.data.slot,
index: att.data.index,
})?;

if let Some(committee) = committee {
attesting_indices_base::get_indexed_attestation(committee.committee, att)
.map(|attestation| (attestation, committees_per_slot))
.map_err(Error::Invalid)
} else {
Err(Error::NoCommitteeForSlotAndIndex {
slot: att.data.slot,
index: att.data.index,
})
}
}
AttestationRef::Electra(att) => {
attesting_indices_electra::get_indexed_attestation(&committees, att)
.map(|attestation| (attestation, committees_per_slot))
.map_err(|e| {
if e == BlockOperationError::BeaconStateError(NoCommitteeFound) {
Error::NoCommitteeForSlotAndIndex {
slot: att.data.slot,
index: att.committee_index(),
}
} else {
Error::Invalid(e)
}
})
}
}
})
}

// TODO(electra) update comments below to reflect logic changes
// i.e. this now runs the map_fn on a list of committees for the slot of the provided attestation
/// Runs the `map_fn` with the committee and committee count per slot for the given `attestation`.
///
/// This function exists in this odd "map" pattern because efficiently obtaining the committee for
Expand All @@ -1268,14 +1333,14 @@ pub fn obtain_indexed_attestation_and_committees_per_slot<T: BeaconChainTypes>(
///
/// If the committee for `attestation` isn't found in the `shuffling_cache`, we will read a state
/// from disk and then update the `shuffling_cache`.
fn map_attestation_committee<T, F, R>(
fn map_attestation_committees<T, F, R>(
chain: &BeaconChain<T>,
attestation: AttestationRef<T::EthSpec>,
attestation: &AttestationRef<T::EthSpec>,
map_fn: F,
) -> Result<R, Error>
where
T: BeaconChainTypes,
F: Fn((BeaconCommittee, CommitteesPerSlot)) -> Result<R, Error>,
F: Fn((Vec<BeaconCommittee>, CommitteesPerSlot)) -> Result<R, Error>,
{
let attestation_epoch = attestation.data().slot.epoch(T::EthSpec::slots_per_epoch());
let target = &attestation.data().target;
Expand All @@ -1301,12 +1366,12 @@ where
let committees_per_slot = committee_cache.committees_per_slot();

Ok(committee_cache
.get_beacon_committee(attestation.data().slot, attestation.data().index)
.map(|committee| map_fn((committee, committees_per_slot)))
.unwrap_or_else(|| {
.get_beacon_committees_at_slot(attestation.data().slot)
.map(|committees| map_fn((committees, committees_per_slot)))
.unwrap_or_else(|_| {
Err(Error::NoCommitteeForSlotAndIndex {
slot: attestation.data().slot,
index: attestation.data().index,
index: attestation.committee_index(),
})
}))
})
Expand Down
42 changes: 30 additions & 12 deletions beacon_node/beacon_chain/src/beacon_chain.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1917,18 +1917,36 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
};
drop(cache_timer);

// TODO(electra) implement electra variant
Ok(Attestation::Base(AttestationBase {
aggregation_bits: BitList::with_capacity(committee_len)?,
data: AttestationData {
slot: request_slot,
index: request_index,
beacon_block_root,
source: justified_checkpoint,
target,
},
signature: AggregateSignature::empty(),
}))
if self.spec.fork_name_at_slot::<T::EthSpec>(request_slot) >= ForkName::Electra {
let mut committee_bits = BitVector::default();
if committee_len > 0 {
committee_bits.set(request_index as usize, true)?;
}
Ok(Attestation::Electra(AttestationElectra {
aggregation_bits: BitList::with_capacity(committee_len)?,
data: AttestationData {
slot: request_slot,
index: 0u64,
beacon_block_root,
source: justified_checkpoint,
target,
},
committee_bits,
signature: AggregateSignature::empty(),
}))
} else {
Ok(Attestation::Base(AttestationBase {
aggregation_bits: BitList::with_capacity(committee_len)?,
data: AttestationData {
slot: request_slot,
index: request_index,
beacon_block_root,
source: justified_checkpoint,
target,
},
signature: AggregateSignature::empty(),
}))
}
}

/// Performs the same validation as `Self::verify_unaggregated_attestation_for_gossip`, but for
Expand Down
46 changes: 34 additions & 12 deletions beacon_node/beacon_chain/src/early_attester_cache.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -124,18 +124,40 @@ impl<E: EthSpec> EarlyAttesterCache<E> {
.get_committee_length::<E>(request_slot, request_index, spec)?;

// TODO(electra) make fork-agnostic
let attestation = Attestation::Base(AttestationBase {
aggregation_bits: BitList::with_capacity(committee_len)
.map_err(BeaconStateError::from)?,
data: AttestationData {
slot: request_slot,
index: request_index,
beacon_block_root: item.beacon_block_root,
source: item.source,
target: item.target,
},
signature: AggregateSignature::empty(),
});
let attestation = if spec.fork_name_at_slot::<E>(request_slot) >= ForkName::Electra {
let mut committee_bits = BitVector::default();
if committee_len > 0 {
committee_bits
.set(request_index as usize, true)
.map_err(BeaconStateError::from)?;
}
Attestation::Electra(AttestationElectra {
aggregation_bits: BitList::with_capacity(committee_len)
.map_err(BeaconStateError::from)?,
committee_bits,
data: AttestationData {
slot: request_slot,
index: 0u64,
beacon_block_root: item.beacon_block_root,
source: item.source,
target: item.target,
},
signature: AggregateSignature::empty(),
})
} else {
Attestation::Base(AttestationBase {
aggregation_bits: BitList::with_capacity(committee_len)
.map_err(BeaconStateError::from)?,
data: AttestationData {
slot: request_slot,
index: request_index,
beacon_block_root: item.beacon_block_root,
source: item.source,
target: item.target,
},
signature: AggregateSignature::empty(),
})
};

metrics::inc_counter(&metrics::BEACON_EARLY_ATTESTER_CACHE_HITS);

Expand Down
37 changes: 22 additions & 15 deletions beacon_node/beacon_chain/src/observed_aggregates.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,8 @@ pub type ObservedSyncContributions<E> = ObservedAggregates<
E,
BitVector<<E as types::EthSpec>::SyncSubcommitteeSize>,
>;
pub type ObservedAggregateAttestations<E> = ObservedAggregates<
Attestation<E>,
E,
BitList<<E as types::EthSpec>::MaxValidatorsPerCommittee>,
>;
pub type ObservedAggregateAttestations<E> =
ObservedAggregates<Attestation<E>, E, BitList<<E as types::EthSpec>::MaxValidatorsPerSlot>>;

/// A trait use to associate capacity constants with the type being stored in `ObservedAggregates`.
pub trait Consts {
Expand Down Expand Up @@ -103,29 +100,39 @@ pub trait SubsetItem {
}

impl<'a, E: EthSpec> SubsetItem for AttestationRef<'a, E> {
type Item = BitList<E::MaxValidatorsPerCommittee>;
type Item = BitList<E::MaxValidatorsPerSlot>;
fn is_subset(&self, other: &Self::Item) -> bool {
match self {
Self::Base(att) => att.aggregation_bits.is_subset(other),
// TODO(electra) implement electra variant
Self::Electra(_) => todo!(),
Self::Base(att) => {
if let Ok(extended_aggregation_bits) = att.extend_aggregation_bits() {
return extended_aggregation_bits.is_subset(other);
}
false
}
Self::Electra(att) => att.aggregation_bits.is_subset(other),
}
}

fn is_superset(&self, other: &Self::Item) -> bool {
match self {
Self::Base(att) => other.is_subset(&att.aggregation_bits),
// TODO(electra) implement electra variant
Self::Electra(_) => todo!(),
Self::Base(att) => {
if let Ok(extended_aggregation_bits) = att.extend_aggregation_bits() {
return other.is_subset(&extended_aggregation_bits);
}
false
}
Self::Electra(att) => other.is_subset(&att.aggregation_bits),
}
}

/// Returns the sync contribution aggregation bits.
fn get_item(&self) -> Self::Item {
match self {
Self::Base(att) => att.aggregation_bits.clone(),
// TODO(electra) implement electra variant
Self::Electra(_) => todo!(),
Self::Base(att) => {
// TODO(electra) fix unwrap
att.extend_aggregation_bits().unwrap()
}
Self::Electra(att) => att.aggregation_bits.clone(),
}
}

Expand Down
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