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https://gitlab.com/pulsechaincom/prysm-pulse.git
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59 lines
2.2 KiB
Go
59 lines
2.2 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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"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/v3/config/params"
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"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
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"github.com/prysmaticlabs/prysm/v3/time/slots"
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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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//
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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 primitives.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 primitives.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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//
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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 primitives.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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