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https://gitlab.com/pulsechaincom/prysm-pulse.git
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b577869ed6
* Fixes import aliases * another fix * reset gw files Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
73 lines
2.7 KiB
Go
73 lines
2.7 KiB
Go
package helpers
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import (
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"math"
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"github.com/pkg/errors"
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types "github.com/prysmaticlabs/eth2-types"
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// VerifyNilBeaconBlock checks if any composite field of input signed beacon block is nil.
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// Access to these nil fields will result in run time panic,
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// it is recommended to run these checks as first line of defense.
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func VerifyNilBeaconBlock(b *ethpb.SignedBeaconBlock) error {
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if b == nil {
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return errors.New("signed beacon block can't be nil")
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}
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if b.Block == nil {
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return errors.New("beacon block can't be nil")
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}
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if b.Block.Body == nil {
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return errors.New("beacon block body can't be nil")
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}
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return nil
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}
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// BlockRootAtSlot returns the block root stored in the BeaconState for a recent slot.
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// It returns an error if the requested block root is not within the slot range.
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//
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// Spec pseudocode definition:
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// def get_block_root_at_slot(state: BeaconState, slot: Slot) -> Hash:
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// """
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// Return the block root at a recent ``slot``.
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// """
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// assert slot < state.slot <= slot + SLOTS_PER_HISTORICAL_ROOT
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// return state.block_roots[slot % SLOTS_PER_HISTORICAL_ROOT]
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func BlockRootAtSlot(state *stateTrie.BeaconState, slot types.Slot) ([]byte, error) {
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if math.MaxUint64-slot < params.BeaconConfig().SlotsPerHistoricalRoot {
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return []byte{}, errors.New("slot overflows uint64")
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}
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if slot >= state.Slot() || state.Slot() > slot+params.BeaconConfig().SlotsPerHistoricalRoot {
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return []byte{}, errors.Errorf("slot %d out of bounds", slot)
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}
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return state.BlockRootAtIndex(uint64(slot % params.BeaconConfig().SlotsPerHistoricalRoot))
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}
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// StateRootAtSlot returns the cached state root at that particular slot. If no state
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// root has been cached it will return a zero-hash.
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func StateRootAtSlot(state *stateTrie.BeaconState, slot types.Slot) ([]byte, error) {
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if slot >= state.Slot() || state.Slot() > slot+params.BeaconConfig().SlotsPerHistoricalRoot {
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return []byte{}, errors.Errorf("slot %d out of bounds", slot)
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}
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return state.StateRootAtIndex(uint64(slot % params.BeaconConfig().SlotsPerHistoricalRoot))
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}
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// BlockRoot returns the block root stored in the BeaconState for epoch start slot.
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//
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// Spec pseudocode definition:
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// def get_block_root(state: BeaconState, epoch: Epoch) -> Hash:
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// """
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// Return the block root at the start of a recent ``epoch``.
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// """
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// return get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch))
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func BlockRoot(state *stateTrie.BeaconState, epoch types.Epoch) ([]byte, error) {
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s, err := StartSlot(epoch)
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if err != nil {
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return nil, err
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}
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return BlockRootAtSlot(state, s)
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}
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