mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-26 13:18:57 +00:00
113 lines
4.4 KiB
Go
113 lines
4.4 KiB
Go
package blockchain
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import (
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"context"
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"fmt"
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"github.com/pkg/errors"
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/prysmaticlabs/prysm/shared/timeutils"
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"go.opencensus.io/trace"
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)
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// ErrTargetRootNotInDB returns when the target block root of an attestation cannot be found in the
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// beacon database.
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var ErrTargetRootNotInDB = errors.New("target root does not exist in db")
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// onAttestation is called whenever an attestation is received, verifies the attestation is valid and saves
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// it to the DB. As a stateless function, this does not hold nor delay attestation based on the spec descriptions.
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// The delay is handled by the caller in `processAttestation`.
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//
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// Spec pseudocode definition:
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// def on_attestation(store: Store, attestation: Attestation) -> None:
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// """
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// Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
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//
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// An ``attestation`` that is asserted as invalid may be valid at a later time,
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// consider scheduling it for later processing in such case.
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// """
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// validate_on_attestation(store, attestation)
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// store_target_checkpoint_state(store, attestation.data.target)
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//
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// # Get state at the `target` to fully validate attestation
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// target_state = store.checkpoint_states[attestation.data.target]
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// indexed_attestation = get_indexed_attestation(target_state, attestation)
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// assert is_valid_indexed_attestation(target_state, indexed_attestation)
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//
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// # Update latest messages for attesting indices
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// update_latest_messages(store, indexed_attestation.attesting_indices, attestation)
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// TODO(#6072): This code path is highly untested. Requires comprehensive tests and simpler refactoring.
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func (s *Service) onAttestation(ctx context.Context, a *ethpb.Attestation) ([]uint64, error) {
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ctx, span := trace.StartSpan(ctx, "blockChain.onAttestation")
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defer span.End()
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if a == nil {
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return nil, errors.New("nil attestation")
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}
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if a.Data == nil {
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return nil, errors.New("nil attestation.Data field")
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}
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if a.Data.Target == nil {
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return nil, errors.New("nil attestation.Data.Target field")
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}
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tgt := stateTrie.CopyCheckpoint(a.Data.Target)
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if helpers.SlotToEpoch(a.Data.Slot) != a.Data.Target.Epoch {
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return nil, fmt.Errorf("data slot is not in the same epoch as target %d != %d", helpers.SlotToEpoch(a.Data.Slot), a.Data.Target.Epoch)
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}
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// Verify beacon node has seen the target block before.
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if !s.hasBlock(ctx, bytesutil.ToBytes32(tgt.Root)) {
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return nil, ErrTargetRootNotInDB
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}
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// Retrieve attestation's data beacon block pre state. Advance pre state to latest epoch if necessary and
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// save it to the cache.
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baseState, err := s.getAttPreState(ctx, tgt)
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if err != nil {
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return nil, err
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}
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genesisTime := baseState.GenesisTime()
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// Verify attestation target is from current epoch or previous epoch.
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if err := s.verifyAttTargetEpoch(ctx, genesisTime, uint64(timeutils.Now().Unix()), tgt); err != nil {
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return nil, err
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}
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// Verify attestation beacon block is known and not from the future.
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if err := s.verifyBeaconBlock(ctx, a.Data); err != nil {
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return nil, errors.Wrap(err, "could not verify attestation beacon block")
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}
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// Verify LMG GHOST and FFG votes are consistent with each other.
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if err := s.verifyLMDFFGConsistent(ctx, a.Data.Target.Epoch, a.Data.Target.Root, a.Data.BeaconBlockRoot); err != nil {
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return nil, errors.Wrap(err, "could not verify attestation beacon block")
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}
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// Verify attestations can only affect the fork choice of subsequent slots.
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if err := helpers.VerifySlotTime(genesisTime, a.Data.Slot+1, params.BeaconNetworkConfig().MaximumGossipClockDisparity); err != nil {
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return nil, err
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}
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// Use the target state to validate attestation and calculate the committees.
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indexedAtt, err := s.verifyAttestation(ctx, baseState, a)
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if err != nil {
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return nil, err
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}
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if indexedAtt.AttestingIndices == nil {
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return nil, errors.New("nil attesting indices")
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}
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// Update forkchoice store with the new attestation for updating weight.
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s.forkChoiceStore.ProcessAttestation(ctx, indexedAtt.AttestingIndices, bytesutil.ToBytes32(a.Data.BeaconBlockRoot), a.Data.Target.Epoch)
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return indexedAtt.AttestingIndices, nil
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}
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