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https://gitlab.com/pulsechaincom/prysm-pulse.git
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e1310adb4c
* docs improvements so far * all misc docs items * finalized * Merge branch 'master' into qsp-docs * fix broken test * Merge branch 'master' into qsp-docs
37 lines
1.4 KiB
Go
37 lines
1.4 KiB
Go
package helpers
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import (
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"github.com/pkg/errors"
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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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// 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 uint64) ([]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.BlockRootAtIndex(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 uint64) ([]byte, error) {
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return BlockRootAtSlot(state, StartSlot(epoch))
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}
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