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cycle through committee indexes instead of through active shards when forming crosslinks

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Danny Ryan 2020-01-15 17:43:11 -07:00
parent 3c07b2c954
commit c0b69e531f
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1 changed files with 12 additions and 3 deletions
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15
specs/phase1/beacon-chain.md
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@ -413,6 +413,14 @@ def chunks_to_body_root(chunks: List[Bytes32, MAX_SHARD_BLOCK_CHUNKS]) -> Root:
))
```
#### `compute_shard_from_committee_index`
```python
def compute_shard_from_committee_index(state: BeaconState, index: CommitteeIndex, slot: Slot) -> Shard:
active_shards = get_active_shard_count(state)
return Shard((index + get_start_shard(state, slot)) % active_shards)
```
### Beacon state accessors
#### `get_active_shard_count`
@ -501,8 +509,7 @@ def get_start_shard(state: BeaconState, slot: Slot) -> Shard:
```python
def get_shard(state: BeaconState, attestation: Attestation) -> Shard:
active_shards = get_active_shard_count(state)
return Shard((attestation.data.index + get_start_shard(state, attestation.data.slot)) % active_shards)
return compute_shard_from_committee_index(state, attestation.data.index, attestation.data.slot)
```
#### `get_next_slot_for_shard`
@ -760,7 +767,9 @@ def process_crosslinks(state: BeaconState,
block_body: BeaconBlockBody,
attestations: Sequence[Attestation]) -> Set[Tuple[Shard, Root]]:
winners: Set[Tuple[Shard, Root]] = set()
for shard in map(Shard, range(get_active_shard_count(state))):
committee_count = get_committee_count_at_slot(state, state.slot)
for committee_index in map(CommitteeIndex, range(committee_count)):
shard = compute_shard_from_committee_index(state, committee_index, state.slot)
# All attestations in the block for this shard
shard_attestations = [
attestation for attestation in attestations