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712cc18ee0
* Replace manual checks with helper * Rename to `BeaconBlockIsNil` Co-authored-by: Raul Jordan <raul@prysmaticlabs.com> Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
74 lines
2.8 KiB
Go
74 lines
2.8 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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"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/proto/prysm/v1alpha1/block"
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"github.com/prysmaticlabs/prysm/time/slots"
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)
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// BeaconBlockIsNil 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 BeaconBlockIsNil(b block.SignedBeaconBlock) error {
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if b == nil || b.IsNil() {
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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().IsNil() {
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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().IsNil() {
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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) -> Root:
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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 state.ReadOnlyBeaconState, 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 state.ReadOnlyBeaconState, 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) -> Root:
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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 state.ReadOnlyBeaconState, epoch types.Epoch) ([]byte, error) {
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s, err := slots.EpochStart(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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