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Address Danny's comment

This commit is contained in:
Justin Drake 2019-05-06 17:34:03 +01:00
parent 5fb32fd19b
commit b15105e1cb
1 changed files with 10 additions and 15 deletions
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specs/core/0_beacon-chain.md
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@ -1298,22 +1298,17 @@ def get_attesting_balance(state: BeaconState, attestations: List[PendingAttestat
```python ```python
def get_winning_crosslink_and_attesting_indices(state: BeaconState, epoch: Epoch, shard: Shard) -> Tuple[Crosslink, List[ValidatorIndex]]: def get_winning_crosslink_and_attesting_indices(state: BeaconState, epoch: Epoch, shard: Shard) -> Tuple[Crosslink, List[ValidatorIndex]]:
shard_attestations = [a for a in get_matching_source_attestations(state, epoch) if a.data.crosslink.shard == shard] attestations = [a for a in get_matching_source_attestations(state, epoch) if a.data.crosslink.shard == shard]
candidate_crosslinks = [ crosslinks = list(filter(
c for c in [a.data.crosslink for a in shard_attestations] lambda c: hash_tree_root(state.current_crosslinks[shard]) in (c.previous_crosslink_root, hash_tree_root(c)),
if hash_tree_root(state.current_crosslinks[shard]) in (c.previous_crosslink_root, hash_tree_root(c)) [a.data.crosslink for a in attestations]
]
if len(candidate_crosslinks) == 0:
return Crosslink(), []
def get_attestations_for(crosslink: Crosslink) -> List[PendingAttestation]:
return [a for a in shard_attestations if a.data.crosslink == crosslink]
# Winning crosslink has the crosslink data root with the most balance voting for it (ties broken lexicographically)
winning_crosslink = max(candidate_crosslinks, key=lambda crosslink: (
get_attesting_balance(state, get_attestations_for(crosslink)), crosslink.crosslink_data_root
)) ))
# Winning crosslink has the crosslink data root with the most balance voting for it (ties broken lexicographically)
return winning_crosslink, get_unslashed_attesting_indices(state, get_attestations_for(winning_crosslink)) winning_crosslink = max(crosslinks, key=lambda c: (
get_attesting_balance(state, [a for a in attestations if a.data.crosslink == c]), c.crosslink_data_root
), default=Crosslink())
winning_attestations = [a for a in attestations if a.data.crosslink == winning_crosslink]
return winning_crosslink, get_unslashed_attesting_indices(state, winning_attestations)
``` ```
#### Justification and finalization #### Justification and finalization