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restore compute_committee

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This commit is contained in:
Justin Drake 2019-05-01 15:21:38 +01:00
parent a0158c606e
commit e85678ac15
2 changed files with 18 additions and 11 deletions
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22
specs/core/0_beacon-chain.md
View File

@ -73,7 +73,7 @@
- [`get_beacon_proposer_index`](#get_beacon_proposer_index)
- [`verify_merkle_branch`](#verify_merkle_branch)
- [`get_shuffled_index`](#get_shuffled_index)
- [`get_committee`](#get_committee)
- [`compute_committee`](#compute_committee)
- [`get_crosslink_committee`](#get_crosslink_committee)
- [`get_attesting_indices`](#get_attesting_indices)
- [`int_to_bytes1`, `int_to_bytes2`, ...](#int_to_bytes1-int_to_bytes2-)
@ -908,23 +908,25 @@ def get_shuffled_index(index: ValidatorIndex, index_count: int, seed: Bytes32) -
return index
```
### `get_committee`
### `compute_committee`
```python
def get_committee(state: BeaconState, epoch: Epoch, index: int, count: int) -> List[ValidatorIndex]:
active_indices = get_active_validator_indices(state, epoch)
return [
active_indices[get_shuffled_index(i, len(active_indices), generate_seed(state, epoch))]
for i in range((len(active_indices) * index) // count, (len(active_indices) * (index + 1)) // count)
]
def compute_committee(indices: List[ValidatorIndex], seed: Bytes32, index: int, count: int) -> List[ValidatorIndex]:
start = (len(indices) * index) // count
end = (len(indices) * (index + 1)) // count
return [indices[get_shuffled_index(i, len(indices), seed)] for i in range(start, end)]
```
### `get_crosslink_committee`
```python
def get_crosslink_committee(state: BeaconState, epoch: Epoch, shard: Shard) -> List[ValidatorIndex]:
committee_index = (shard + SHARD_COUNT - get_epoch_start_shard(state, epoch)) % SHARD_COUNT
return get_committee(state, epoch, committee_index, get_epoch_committee_count(state, epoch))
return compute_committee(
indices=get_active_validator_indices(state, epoch),
seed=generate_seed(state, epoch),
index=(shard + SHARD_COUNT - get_epoch_start_shard(state, epoch)) % SHARD_COUNT,
count=get_epoch_committee_count(state, epoch),
)
```
### `get_attesting_indices`

7
specs/core/1_shard-data-chains.md
View File

@ -124,7 +124,12 @@ def get_period_committee(state: BeaconState, epoch: Epoch, shard: Shard, index:
"""
Return committee for a period. Used to construct persistent committees.
"""
return get_committee(state, epoch, shard * count + index, SHARD_COUNT * count)
return compute_committee(
indices=get_active_validator_indices(state, epoch),
seed=generate_seed(state, epoch),
index=shard * count + index,
count=SHARD_COUNT * count,
)
```
### `get_switchover_epoch`