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Danny Ryan 2020-06-10 11:32:02 -05:00
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specs/phase1/validator.md
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@ -75,6 +75,7 @@ See constants from [Phase 0 validator guide](../phase0/validator.md#constants).
| Name | Value | Unit | Duration | | Name | Value | Unit | Duration |
| - | - | :-: | :-: | | - | - | :-: | :-: |
| `TARGET_LIGHT_CLIENT_AGGREGATORS_PER_SLOT` | `2**3` (= 8) | validators | | | `TARGET_LIGHT_CLIENT_AGGREGATORS_PER_SLOT` | `2**3` (= 8) | validators | |
| `LIGHT_CLIENT_PREPARATION_EPOCHS` | `2**2` (= 4) | epochs | |
## Becoming a validator ## Becoming a validator
@ -86,7 +87,7 @@ Beacon chain validator assignments to beacon committees and beacon block proposa
### Lookahead ### Lookahead
Lookahead for beacon committee assignments operates in the same manner as Phase 0, but committee members must join a shard block pubsub topic in addition to the committee attestation topic.o Lookahead for beacon committee assignments operates in the same manner as Phase 0, but committee members must join a shard block pubsub topic in addition to the committee attestation topic.
Specifically _after_ finding stable peers of attestation subnets (see Phase 0) a validator should: Specifically _after_ finding stable peers of attestation subnets (see Phase 0) a validator should:
* Let `shard = compute_shard_from_committee_index(committe_index)` * Let `shard = compute_shard_from_committee_index(committe_index)`
@ -196,7 +197,8 @@ def get_best_light_client_aggregate(block: BeaconBlock,
return max( return max(
viable_aggregates, viable_aggregates,
key=lambda a: len([i for i in a.aggregation_bits if i == 1]), # Ties broken by lexicographically by hash_tree_root
key=lambda a: (len([i for i in a.aggregation_bits if i == 1]), hash_tree_root(a)),
default=LightClientVote(), default=LightClientVote(),
) )
``` ```
@ -378,9 +380,10 @@ When `get_current_epoch(state) % LIGHT_CLIENT_COMMITTEE_PERIOD == LIGHT_CLIENT_C
If the validator is in the next light client committee, they must join the `light_client_votes` pubsub topic to begin duties at the start of the next period. If the validator is in the next light client committee, they must join the `light_client_votes` pubsub topic to begin duties at the start of the next period.
```python ```python
def is_in_next_light_client_committee(state: BeaconState, index: ValidatorIndex) -> boolean: def is_in_next_light_client_committee(state: BeaconState, index: ValidatorIndex) -> bool:
period_start_epoch = get_current_epoch(state) + LIGHT_CLIENT_COMMITTEE_PERIOD % get_current_epoch(state) current_source_epoch = compute_committee_source_epoch(get_current_epoch(state), LIGHT_CLIENT_COMMITTEE_PERIOD)
next_committee = get_light_client_committee(state, period_start_epoch) next_source_epoch = current_source_epoch + LIGHT_CLIENT_COMMITTEE_PERIOD
next_committee = get_light_client_committee(state, next_source_epoch)
return index in next_committee return index in next_committee
``` ```