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document `GeneralizedIndex` constants (#3443) 

Updates the spec references for `GeneralizedIndex` constants used by the
light client sync protocol, and adds a short explanation how they are
derived and which SSZ fields they refer to.
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Etan Kissling 2022-02-28 13:34:57 +01:00 committed by GitHub
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beacon_chain/spec/datatypes/altair.nim
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@ -51,9 +51,14 @@ const
TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE* = 16
SYNC_COMMITTEE_SUBNET_COUNT* = 4
# https://github.com/ethereum/consensus-specs/blob/v1.1.9/setup.py#L478-L479
FINALIZED_ROOT_INDEX* = 105.GeneralizedIndex
NEXT_SYNC_COMMITTEE_INDEX* = 55.GeneralizedIndex
# https://github.com/ethereum/consensus-specs/blob/v1.1.9/specs/altair/sync-protocol.md#constants
# All of these indices are rooted in `BeaconState`.
# The first member (`genesis_time`) is 32, subsequent members +1 each.
# If there are ever more than 32 members in `BeaconState`, indices change!
# `FINALIZED_ROOT_INDEX` is one layer deeper, i.e., `52 * 2 + 1`.
# https://github.com/ethereum/consensus-specs/blob/v1.1.9/ssz/merkle-proofs.md
FINALIZED_ROOT_INDEX* = 105.GeneralizedIndex # `finalized_checkpoint` > `root`
NEXT_SYNC_COMMITTEE_INDEX* = 55.GeneralizedIndex # `next_sync_committee`
# https://github.com/ethereum/consensus-specs/blob/v1.1.9/specs/altair/beacon-chain.md#participation-flag-indices
TIMELY_SOURCE_FLAG_INDEX* = 0