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fix default value when voting on eth1data

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Danny Ryan 2020-01-09 12:38:56 -07:00
parent ac33b3d088
commit b8d4ce4c39
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1 changed files with 6 additions and 2 deletions
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specs/validator/0_beacon-chain-validator.md
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@ -283,16 +283,20 @@ def is_candidate_block(block: Eth1Block, period_start: uint64) -> bool:
```python ```python
def get_eth1_vote(state: BeaconState, eth1_chain: Sequence[Eth1Block]) -> Eth1Data: def get_eth1_vote(state: BeaconState, eth1_chain: Sequence[Eth1Block]) -> Eth1Data:
period_start = voting_period_start_time(state) period_start = voting_period_start_time(state)
# `eth1_chain` abstractly represents all blocks in the eth1 chain. # `eth1_chain` abstractly represents all blocks in the eth1 chain sorted by ascending block height
votes_to_consider = [get_eth1_data(block) for block in eth1_chain if votes_to_consider = [get_eth1_data(block) for block in eth1_chain if
is_candidate_block(block, period_start)] is_candidate_block(block, period_start)]
# Valid votes already cast during this period
valid_votes = [vote for vote in state.eth1_data_votes if vote in votes_to_consider] valid_votes = [vote for vote in state.eth1_data_votes if vote in votes_to_consider]
# Default vote on latest eth1 block data in the period range unless eth1 chain is not live
default_vote = votes_to_consider[-1] if any(votes_to_consider) else state.eth1_data
return max( return max(
valid_votes, valid_votes,
key=lambda v: (valid_votes.count(v), -valid_votes.index(v)), # Tiebreak by smallest distance key=lambda v: (valid_votes.count(v), -valid_votes.index(v)), # Tiebreak by smallest distance
default=get_eth1_data(ETH1_FOLLOW_DISTANCE), default=default_vote
) )
``` ```