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clarify attestations as coming from block.body when getting winning roots in validator guide

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Danny Ryan 2020-06-05 12:07:59 -06:00
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specs/phase1/validator.md
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@ -74,7 +74,7 @@ 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**2` (= 8) | validators | | | `TARGET_LIGHT_CLIENT_AGGREGATORS_PER_SLOT` | `2**3` (= 8) | validators | |
## Becoming a validator ## Becoming a validator
@ -131,7 +131,7 @@ Up to `MAX_EARLY_DERIVED_SECRET_REVEALS`, [`EarlyDerivedSecretReveal`](./custody
Exactly `MAX_SHARDS` [`ShardTransition`](./beacon-chain#shardtransition) objects are included in the block. Default each to an empty `ShardTransition()`. Then for each committee assigned to the slot with an associated `committee_index` and `shard`, set `shard_transitions[shard] = full_transitions[winning_root]` if the committee had enough weight to form a crosslink this slot. Exactly `MAX_SHARDS` [`ShardTransition`](./beacon-chain#shardtransition) objects are included in the block. Default each to an empty `ShardTransition()`. Then for each committee assigned to the slot with an associated `committee_index` and `shard`, set `shard_transitions[shard] = full_transitions[winning_root]` if the committee had enough weight to form a crosslink this slot.
Specifically: Specifically:
* Call `shards, winning_roots = get_shard_winning_roots(state, block.slot, attestations)` * Call `shards, winning_roots = get_shard_winning_roots(state, block.slot, block.body.attestations)`
* Let `full_transitions` be a dictionary mapping from the `shard_transition_root`s found in `attestations` to the corresponding full `ShardTransition` * Let `full_transitions` be a dictionary mapping from the `shard_transition_root`s found in `attestations` to the corresponding full `ShardTransition`
* Then for each `shard` and `winning_root` in `zip(shards, winning_roots)` set `shard_transitions[shard] = full_transitions[winning_root]` * Then for each `shard` and `winning_root` in `zip(shards, winning_roots)` set `shard_transitions[shard] = full_transitions[winning_root]`
@ -140,7 +140,7 @@ Specifically:
```python ```python
def get_shard_winning_roots(state: BeaconState, def get_shard_winning_roots(state: BeaconState,
slot: Slot, slot: Slot,
attestations: sequence[Attestation]) -> Tuple[Sequence[Shard], Sequence[Root]]: attestations: Sequence[Attestation]) -> Tuple[Sequence[Shard], Sequence[Root]]:
shards = [] shards = []
winning_roots = [] winning_roots = []
online_indices = get_online_validator_indices(state) online_indices = get_online_validator_indices(state)
@ -280,7 +280,7 @@ def get_shard_transition_fields(
shard_block_slots = [shard_block.message.slot for shard_block in shard_blocks] shard_block_slots = [shard_block.message.slot for shard_block in shard_blocks]
offset_slots = compute_offset_slots( offset_slots = compute_offset_slots(
get_latest_slot_for_shard(beacon_state, shard), get_latest_slot_for_shard(beacon_state, shard),
beacon_state.slot + 1, Slot(beacon_state.slot + 1),
) )
for slot in offset_slots: for slot in offset_slots:
if slot in shard_block_slots: if slot in shard_block_slots:
@ -302,7 +302,7 @@ def get_shard_transition(beacon_state: BeaconState,
shard_blocks: Sequence[SignedShardBlock]) -> ShardTransition: shard_blocks: Sequence[SignedShardBlock]) -> ShardTransition:
offset_slots = compute_offset_slots( offset_slots = compute_offset_slots(
get_latest_slot_for_shard(beacon_state, shard), get_latest_slot_for_shard(beacon_state, shard),
beacon_state.slot + 1, Slot(beacon_state.slot + 1),
) )
shard_block_lengths, shard_data_roots, shard_states = ( shard_block_lengths, shard_data_roots, shard_states = (
get_shard_transition_fields(beacon_state, shard, shard_blocks) get_shard_transition_fields(beacon_state, shard, shard_blocks)