Expose get_commitee
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@ -73,6 +73,7 @@
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- [`get_beacon_proposer_index`](#get_beacon_proposer_index)
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- [`verify_merkle_branch`](#verify_merkle_branch)
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- [`get_shuffled_index`](#get_shuffled_index)
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- [`get_committee`](#get_committee)
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- [`get_crosslink_committee`](#get_crosslink_committee)
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- [`get_attesting_indices`](#get_attesting_indices)
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- [`int_to_bytes1`, `int_to_bytes2`, ...](#int_to_bytes1-int_to_bytes2-)
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@ -907,24 +908,23 @@ def get_shuffled_index(index: ValidatorIndex, index_count: int, seed: Bytes32) -
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return index
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```
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### `get_committee`
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```python
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def get_committee(state: BeaconState, epoch: Epoch, index: int, count: int) -> List[ValidatorIndex]:
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active_indices = get_active_validator_indices(state, epoch)
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return [
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active_indices[get_shuffled_index(i, len(active_indices), generate_seed(state, epoch))]
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for i in range((len(active_indices) * index) // count, (len(active_indices) * (index + 1)) // count)
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]
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```
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### `get_crosslink_committee`
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```python
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def get_crosslink_committee(state: BeaconState, epoch: Epoch, shard: Shard) -> List[ValidatorIndex]:
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"""
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Return the crosslink committee at ``epoch`` for ``shard``.
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"""
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active_indices = get_active_validator_indices(state, epoch)
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committee_count = get_epoch_committee_count(state, epoch)
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committee_index = (shard + SHARD_COUNT - get_epoch_start_shard(state, epoch)) % SHARD_COUNT
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start_validator_index = (len(active_indices) * committee_index) // committee_count
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end_validator_index = (len(active_indices) * (committee_index + 1)) // committee_count
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seed = generate_seed(state, epoch)
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return [
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active_indices[get_shuffled_index(i, len(active_indices), seed)]
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for i in range(start_validator_index, end_validator_index)
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]
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return get_committee(state, epoch, committee_index, get_epoch_committee_count(state, epoch))
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```
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### `get_attesting_indices`
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@ -120,22 +120,11 @@ This document describes the shard data layer and the shard fork choice rule in P
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### `get_period_committee`
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```python
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def get_period_committee(state: BeaconState,
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shard: Shard,
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committee_start_epoch: Epoch,
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index: int,
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committee_count: int) -> List[ValidatorIndex]:
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def get_period_committee(state: BeaconState, epoch: Epoch, shard: Shard, index: int, count: int) -> List[ValidatorIndex]:
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"""
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Return committee for a period. Used to construct persistent committees.
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"""
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active_validator_indices = get_active_validator_indices(state.validator_registry, committee_start_epoch)
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seed = generate_seed(state, committee_start_epoch)
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return compute_committee(
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validator_indices=active_validator_indices,
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seed=seed,
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index=shard * committee_count + index,
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total_committees=SHARD_COUNT * committee_count,
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)
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return get_committee(state, epoch, shard * count + index, SHARD_COUNT * count)
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```
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### `get_switchover_epoch`
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@ -165,7 +154,7 @@ def get_persistent_committee(state: BeaconState,
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len(get_active_validator_indices(state.validator_registry, later_start_epoch)) //
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(SHARD_COUNT * TARGET_COMMITTEE_SIZE),
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) + 1
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index = slot % committee_count
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earlier_committee = get_period_committee(state, shard, earlier_start_epoch, index, committee_count)
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later_committee = get_period_committee(state, shard, later_start_epoch, index, committee_count)
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