mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-23 03:51:29 +00:00
d17996f8b0
* Update V3 from V4 * Fix build v3 -> v4 * Update ssz * Update beacon_chain.pb.go * Fix formatter import * Update update-mockgen.sh comment to v4 * Fix conflicts. Pass build and tests * Fix test
104 lines
4.1 KiB
Go
104 lines
4.1 KiB
Go
package blockchain
|
|
|
|
import (
|
|
"context"
|
|
"time"
|
|
|
|
"github.com/pkg/errors"
|
|
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
|
|
"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
|
|
ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
|
|
"github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1/attestation"
|
|
"github.com/prysmaticlabs/prysm/v4/time/slots"
|
|
"go.opencensus.io/trace"
|
|
)
|
|
|
|
// OnAttestation is called whenever an attestation is received, verifies the attestation is valid and saves
|
|
// it to the DB. As a stateless function, this does not hold nor delay attestation based on the spec descriptions.
|
|
// The delay is handled by the caller in `processAttestations`.
|
|
//
|
|
// Spec pseudocode definition:
|
|
//
|
|
// def on_attestation(store: Store, attestation: Attestation) -> None:
|
|
// """
|
|
// Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
|
|
//
|
|
// An ``attestation`` that is asserted as invalid may be valid at a later time,
|
|
// consider scheduling it for later processing in such case.
|
|
// """
|
|
// validate_on_attestation(store, attestation)
|
|
// store_target_checkpoint_state(store, attestation.data.target)
|
|
//
|
|
// # Get state at the `target` to fully validate attestation
|
|
// target_state = store.checkpoint_states[attestation.data.target]
|
|
// indexed_attestation = get_indexed_attestation(target_state, attestation)
|
|
// assert is_valid_indexed_attestation(target_state, indexed_attestation)
|
|
//
|
|
// # Update latest messages for attesting indices
|
|
// update_latest_messages(store, indexed_attestation.attesting_indices, attestation)
|
|
func (s *Service) OnAttestation(ctx context.Context, a *ethpb.Attestation, disparity time.Duration) error {
|
|
ctx, span := trace.StartSpan(ctx, "blockChain.onAttestation")
|
|
defer span.End()
|
|
|
|
if err := helpers.ValidateNilAttestation(a); err != nil {
|
|
return err
|
|
}
|
|
if err := helpers.ValidateSlotTargetEpoch(a.Data); err != nil {
|
|
return err
|
|
}
|
|
tgt := ethpb.CopyCheckpoint(a.Data.Target)
|
|
|
|
// Note that target root check is ignored here because it was performed in sync's validation pipeline:
|
|
// validate_aggregate_proof.go and validate_beacon_attestation.go
|
|
// If missing target root were to fail in this method, it would have just failed in `getAttPreState`.
|
|
|
|
// Retrieve attestation's data beacon block pre state. Advance pre state to latest epoch if necessary and
|
|
// save it to the cache.
|
|
baseState, err := s.getAttPreState(ctx, tgt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
genesisTime := uint64(s.genesisTime.Unix())
|
|
|
|
// Verify attestation target is from current epoch or previous epoch.
|
|
if err := verifyAttTargetEpoch(ctx, genesisTime, uint64(time.Now().Add(disparity).Unix()), tgt); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Verify attestation beacon block is known and not from the future.
|
|
if err := s.verifyBeaconBlock(ctx, a.Data); err != nil {
|
|
return errors.Wrap(err, "could not verify attestation beacon block")
|
|
}
|
|
|
|
// Note that LMD GHOST and FFG consistency check is ignored because it was performed in sync's validation pipeline:
|
|
// validate_aggregate_proof.go and validate_beacon_attestation.go
|
|
|
|
// Verify attestations can only affect the fork choice of subsequent slots.
|
|
if err := slots.VerifyTime(genesisTime, a.Data.Slot+1, disparity); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Use the target state to verify attesting indices are valid.
|
|
committee, err := helpers.BeaconCommitteeFromState(ctx, baseState, a.Data.Slot, a.Data.CommitteeIndex)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
indexedAtt, err := attestation.ConvertToIndexed(ctx, a, committee)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := attestation.IsValidAttestationIndices(ctx, indexedAtt); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Note that signature verification is ignored here because it was performed in sync's validation pipeline:
|
|
// validate_aggregate_proof.go and validate_beacon_attestation.go
|
|
// We assume trusted attestation in this function has verified signature.
|
|
|
|
// Update forkchoice store with the new attestation for updating weight.
|
|
s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indexedAtt.AttestingIndices, bytesutil.ToBytes32(a.Data.BeaconBlockRoot), a.Data.Target.Epoch)
|
|
|
|
return nil
|
|
}
|