mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 21:07:18 +00:00
96 lines
3.6 KiB
Go
96 lines
3.6 KiB
Go
package blockchain
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import (
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"context"
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"fmt"
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"strconv"
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"github.com/pkg/errors"
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types "github.com/prysmaticlabs/eth2-types"
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"github.com/prysmaticlabs/prysm/async"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
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"github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/config/params"
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"github.com/prysmaticlabs/prysm/encoding/bytesutil"
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ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
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"github.com/prysmaticlabs/prysm/time/slots"
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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) (state.BeaconState, error) {
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// Use a multilock to allow scoped holding of a mutex by a checkpoint root + epoch
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// allowing us to behave smarter in terms of how this function is used concurrently.
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epochKey := strconv.FormatUint(uint64(c.Epoch), 10 /* base 10 */)
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lock := async.NewMultilock(string(c.Root) + epochKey)
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lock.Lock()
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defer lock.Unlock()
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cachedState, err := s.checkpointStateCache.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 && !cachedState.IsNil() {
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return cachedState, nil
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}
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baseState, err := s.cfg.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 epoch %d", c.Epoch)
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}
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epochStartSlot, err := slots.EpochStart(c.Epoch)
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if err != nil {
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return nil, err
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}
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baseState, err = transition.ProcessSlotsIfPossible(ctx, baseState, epochStartSlot)
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if err != nil {
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return nil, errors.Wrapf(err, "could not process slots up to epoch %d", c.Epoch)
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}
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// Sharing the same state across caches is perfectly fine here, the fetching
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// of attestation prestate is by far the most accessed state fetching pattern in
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// the beacon node. An extra state instance cached isn't an issue in the bigger
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// picture.
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if err := s.checkpointStateCache.AddCheckpointState(c, baseState); err != nil {
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return nil, errors.Wrap(err, "could not save 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 verifyAttTargetEpoch(_ context.Context, genesisTime, nowTime uint64, c *ethpb.Checkpoint) error {
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currentSlot := types.Slot((nowTime - genesisTime) / params.BeaconConfig().SecondsPerSlot)
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currentEpoch := slots.ToEpoch(currentSlot)
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var prevEpoch types.Epoch
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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.cfg.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 || b.IsNil()) && s.hasInitSyncBlock(r) {
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b = s.getInitSyncBlock(r)
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}
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if err := helpers.BeaconBlockIsNil(b); err != nil {
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return err
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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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