mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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9ebd90c324
* DB: add block roots test * Pool: add seen atts map * Pool: use seen atts map * Pool: clear seen map * Core: optimize InitiateValidatorExit * Cache: checkpoint state uses LRU * Cache: use it * Cache: update tests * Cache: typo * Gaz
114 lines
4.1 KiB
Go
114 lines
4.1 KiB
Go
package blockchain
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import (
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"bytes"
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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/blocks"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/state"
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stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/shared/attestationutil"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// getAttPreState retrieves the att pre state by either from the cache or the DB.
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func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (*stateTrie.BeaconState, error) {
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s.checkpointStateLock.Lock()
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defer s.checkpointStateLock.Unlock()
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cachedState, err := s.checkpointState.StateByCheckpoint(c)
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if err != nil {
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return nil, errors.Wrap(err, "could not get cached checkpoint state")
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}
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if cachedState != nil {
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return cachedState, nil
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}
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baseState, err := s.stateGen.StateByRoot(ctx, bytesutil.ToBytes32(c.Root))
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if err != nil {
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return nil, errors.Wrapf(err, "could not get pre state for slot %d", helpers.StartSlot(c.Epoch))
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}
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if helpers.StartSlot(c.Epoch) > baseState.Slot() {
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baseState = baseState.Copy()
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baseState, err = state.ProcessSlots(ctx, baseState, helpers.StartSlot(c.Epoch))
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if err != nil {
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return nil, errors.Wrapf(err, "could not process slots up to %d", helpers.StartSlot(c.Epoch))
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}
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}
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if err := s.checkpointState.AddCheckpointState(c, baseState); err != nil {
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return nil, errors.Wrap(err, "could not saved checkpoint state to cache")
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}
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return baseState, nil
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}
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// verifyAttTargetEpoch validates attestation is from the current or previous epoch.
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func (s *Service) verifyAttTargetEpoch(ctx context.Context, genesisTime uint64, nowTime uint64, c *ethpb.Checkpoint) error {
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currentSlot := (nowTime - genesisTime) / params.BeaconConfig().SecondsPerSlot
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currentEpoch := helpers.SlotToEpoch(currentSlot)
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var prevEpoch uint64
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// Prevents previous epoch under flow
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if currentEpoch > 1 {
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prevEpoch = currentEpoch - 1
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}
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if c.Epoch != prevEpoch && c.Epoch != currentEpoch {
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return fmt.Errorf("target epoch %d does not match current epoch %d or prev epoch %d", c.Epoch, currentEpoch, prevEpoch)
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}
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return nil
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}
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// verifyBeaconBlock verifies beacon head block is known and not from the future.
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func (s *Service) verifyBeaconBlock(ctx context.Context, data *ethpb.AttestationData) error {
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r := bytesutil.ToBytes32(data.BeaconBlockRoot)
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b, err := s.beaconDB.Block(ctx, r)
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if err != nil {
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return err
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}
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// If the block does not exist in db, check again if block exists in initial sync block cache.
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// This could happen as the node first syncs to head.
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if b == nil && s.hasInitSyncBlock(r) {
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b = s.getInitSyncBlock(r)
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}
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if b == nil || b.Block == nil {
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return fmt.Errorf("beacon block %#x does not exist", bytesutil.Trunc(data.BeaconBlockRoot))
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}
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if b.Block.Slot > data.Slot {
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return fmt.Errorf("could not process attestation for future block, block.Slot=%d > attestation.Data.Slot=%d", b.Block.Slot, data.Slot)
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}
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return nil
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}
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// verifyLMDFFGConsistent verifies LMD GHOST and FFG votes are consistent with each other.
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func (s *Service) verifyLMDFFGConsistent(ctx context.Context, ffgEpoch uint64, ffgRoot []byte, lmdRoot []byte) error {
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ffgSlot := helpers.StartSlot(ffgEpoch)
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r, err := s.ancestor(ctx, lmdRoot, ffgSlot)
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if err != nil {
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return err
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}
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if !bytes.Equal(ffgRoot, r) {
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return errors.New("FFG and LMD votes are not consistent")
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}
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return nil
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}
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// verifyAttestation validates input attestation is valid.
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func (s *Service) verifyAttestation(ctx context.Context, baseState *stateTrie.BeaconState, a *ethpb.Attestation) (*ethpb.IndexedAttestation, error) {
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committee, err := helpers.BeaconCommitteeFromState(baseState, a.Data.Slot, a.Data.CommitteeIndex)
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if err != nil {
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return nil, err
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}
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indexedAtt := attestationutil.ConvertToIndexed(ctx, a, committee)
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if err := blocks.VerifyIndexedAttestation(ctx, baseState, indexedAtt); err != nil {
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return nil, errors.Wrap(err, "could not verify indexed attestation")
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}
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return indexedAtt, nil
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}
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