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Merge pull request #694 from ethereum/proposer-next-epoch 

make get_beacon_proposer_index safe for next epoch
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Danny Ryan 2019-03-03 17:01:20 -07:00 committed by GitHub
parent 146aef313e 34091d70ec
commit cc146475d9
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2 changed files with 12 additions and 5 deletions
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12
specs/core/0_beacon-chain.md
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@ -971,11 +971,19 @@ def generate_seed(state: BeaconState,
```python
def get_beacon_proposer_index(state: BeaconState,
slot: Slot) -> ValidatorIndex:
slot: Slot,
registry_change: bool=False) -> ValidatorIndex:
"""
Return the beacon proposer index for the ``slot``.
"""
first_committee, _ = get_crosslink_committees_at_slot(state, slot)[0]
epoch = slot_to_epoch(slot)
current_epoch = get_current_epoch(state)
previous_epoch = get_previous_epoch(state)
next_epoch = current_epoch + 1
assert previous_epoch <= epoch <= next_epoch
first_committee, _ = get_crosslink_committees_at_slot(state, slot, registry_change)[0]
return first_committee[slot % len(first_committee)]
```

5
specs/validator/0_beacon-chain-validator.md
View File

@ -50,7 +50,7 @@ __NOTICE__: This document is a work-in-progress for researchers and implementers
- [Aggregation bitfield](#aggregation-bitfield)
- [Custody bitfield](#custody-bitfield)
- [Aggregate signature](#aggregate-signature)
- [Validator assigments](#validator-assignments)
- [Validator assignments](#validator-assignments)
- [Lookahead](#lookahead)
- [How to avoid slashing](#how-to-avoid-slashing)
- [Proposer slashing](#proposer-slashing)
@ -371,8 +371,7 @@ def get_committee_assignment(
if len(selected_committees) > 0:
validators = selected_committees[0][0]
shard = selected_committees[0][1]
first_committee_at_slot = crosslink_committees[0][0] # List[ValidatorIndex]
is_proposer = first_committee_at_slot[slot % len(first_committee_at_slot)] == validator_index
is_proposer = validator_index == get_beacon_proposer_index(state, slot, registry_change=registry_change)
assignment = (validators, shard, slot, is_proposer)
return assignment