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Merge pull request #1013 from terencechain/patch-69 

Generate seed once for get_beacon_proposer_index
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Danny Ryan 2019-05-01 07:56:57 -06:00 committed by GitHub
parent dc458bfd2b f62126d5ee
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specs/core/0_beacon-chain.md
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@ -928,10 +928,11 @@ def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
current_epoch = get_current_epoch(state) current_epoch = get_current_epoch(state)
first_committee, _ = get_crosslink_committees_at_slot(state, state.slot)[0] first_committee, _ = get_crosslink_committees_at_slot(state, state.slot)[0]
MAX_RANDOM_BYTE = 2**8 - 1 MAX_RANDOM_BYTE = 2**8 - 1
seed = generate_seed(state, current_epoch)
i = 0 i = 0
while True: while True:
candidate_index = first_committee[(current_epoch + i) % len(first_committee)] candidate_index = first_committee[(current_epoch + i) % len(first_committee)]
random_byte = hash(generate_seed(state, current_epoch) + int_to_bytes8(i // 32))[i % 32] random_byte = hash(seed + int_to_bytes8(i // 32))[i % 32]
effective_balance = state.validator_registry[candidate_index].effective_balance effective_balance = state.validator_registry[candidate_index].effective_balance
if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte: if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
return candidate_index return candidate_index