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implement get_committee_assignment(...) by spec transcription

This commit is contained in:
Dustin Brody 2020-02-20 23:22:59 +01:00 committed by tersec
parent fb771d52f0
commit 4782ae06e6
1 changed files with 24 additions and 0 deletions
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24
beacon_chain/spec/validator.nim
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@ -193,3 +193,27 @@ func get_beacon_proposer_index*(state: BeaconState, stateCache: var StateCache):
indices = get_active_validator_indices(state, epoch)
compute_proposer_index(state, indices, seed, stateCache)
# https://github.com/ethereum/eth2.0-specs/blob/v0.10.1/specs/phase0/validator.md#validator-assignments
func get_committee_assignment(
state: BeaconState, epoch: Epoch, validator_index: ValidatorIndex):
Option[tuple[a: seq[ValidatorIndex], b: uint64, c: Slot]] =
# Return the committee assignment in the ``epoch`` for ``validator_index``.
# ``assignment`` returned is a tuple of the following form:
# * ``assignment[0]`` is the list of validators in the committee
# * ``assignment[1]`` is the index to which the committee is assigned
# * ``assignment[2]`` is the slot at which the committee is assigned
# Return None if no assignment.
let next_epoch = get_current_epoch(state) + 1
doAssert epoch <= next_epoch
var cache = get_empty_per_epoch_cache()
let start_slot = compute_start_slot_at_epoch(epoch)
for slot in start_slot ..< start_slot + SLOTS_PER_EPOCH:
for index in 0 ..< get_committee_count_at_slot(state, Slot(slot)):
let committee =
get_beacon_committee(state, slot, index, cache)
if validator_index in committee:
return some((committee, index, slot))
none(tuple[a: seq[ValidatorIndex], b: uint64, c: Slot])