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Extract compute_committee_source_epoch

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Hsiao-Wei Wang 2020-05-30 03:09:42 +08:00
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1 changed files with 16 additions and 6 deletions
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specs/phase1/beacon-chain.md
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@ -40,6 +40,7 @@
- [`compute_shard_from_committee_index`](#compute_shard_from_committee_index)
- [`compute_offset_slots`](#compute_offset_slots)
- [`compute_updated_gasprice`](#compute_updated_gasprice)
- [`compute_committee_source_epoch`](#compute_committee_source_epoch)
- [Beacon state accessors](#beacon-state-accessors)
- [`get_active_shard_count`](#get_active_shard_count)
- [`get_online_validator_indices`](#get_online_validator_indices)
@ -458,6 +459,19 @@ def compute_updated_gasprice(prev_gasprice: Gwei, shard_block_length: uint8) ->
return max(prev_gasprice, MIN_GASPRICE + delta) - delta
```
#### `compute_committee_source_epoch`
```python
def compute_committee_source_epoch(epoch: Epoch, period: uint64) -> Epoch:
"""
Return the source epoch for computing the committee.
"""
source_epoch = epoch - epoch % period
if source_epoch >= period:
source_epoch -= period # `period` epochs lookahead
return source_epoch
```
### Beacon state accessors
#### `get_active_shard_count`
@ -482,9 +496,7 @@ def get_shard_committee(beacon_state: BeaconState, epoch: Epoch, shard: Shard) -
"""
Return the shard committee of the given ``epoch`` of the given ``shard``.
"""
source_epoch = epoch - epoch % SHARD_COMMITTEE_PERIOD
if source_epoch >= SHARD_COMMITTEE_PERIOD:
source_epoch -= SHARD_COMMITTEE_PERIOD # `SHARD_COMMITTEE_PERIOD` epochs lookahead
source_epoch = compute_committee_source_epoch(epoch, SHARD_COMMITTEE_PERIOD)
active_validator_indices = get_active_validator_indices(beacon_state, source_epoch)
seed = get_seed(beacon_state, source_epoch, DOMAIN_SHARD_COMMITTEE)
active_shard_count = get_active_shard_count(beacon_state)
@ -503,9 +515,7 @@ def get_light_client_committee(beacon_state: BeaconState, epoch: Epoch) -> Seque
"""
Return the light client committee that no more than ``TARGET_COMMITTEE_SIZE`` validators.
"""
source_epoch = epoch - epoch % LIGHT_CLIENT_COMMITTEE_PERIOD
if source_epoch >= LIGHT_CLIENT_COMMITTEE_PERIOD:
source_epoch -= LIGHT_CLIENT_COMMITTEE_PERIOD # `LIGHT_CLIENT_COMMITTEE_PERIOD` epochs lookahead
source_epoch = compute_committee_source_epoch(epoch, LIGHT_CLIENT_COMMITTEE_PERIOD)
active_validator_indices = get_active_validator_indices(beacon_state, source_epoch)
seed = get_seed(beacon_state, source_epoch, DOMAIN_LIGHT_CLIENT)
return compute_committee(