status-im
/
eth2.0-specs
mirror of https://github.com/status-im/eth2.0-specs.git
2
0
Fork 0
Code Issues Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
specs/core/0_beacon-chain.md
View File

@ -1298,22 +1298,17 @@ def get_attesting_balance(state: BeaconState, attestations: List[PendingAttestat
```python
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]
candidate_crosslinks = [
c for c in [a.data.crosslink for a in shard_attestations]
if hash_tree_root(state.current_crosslinks[shard]) in (c.previous_crosslink_root, hash_tree_root(c))
]
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
attestations = [a for a in get_matching_source_attestations(state, epoch) if a.data.crosslink.shard == shard]
crosslinks = list(filter(
lambda c: hash_tree_root(state.current_crosslinks[shard]) in (c.previous_crosslink_root, hash_tree_root(c)),
[a.data.crosslink for a in attestations]
))
return winning_crosslink, get_unslashed_attesting_indices(state, get_attestations_for(winning_crosslink))
# Winning crosslink has the crosslink data root with the most balance voting for it (ties broken lexicographically)
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