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global selection of shard proposers

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protolambda 2021-06-17 23:17:47 +02:00
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specs/sharding/beacon-chain.md
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@ -43,7 +43,6 @@
- [Beacon state accessors](#beacon-state-accessors)
- [Updated `get_committee_count_per_slot`](#updated-get_committee_count_per_slot)
- [`get_active_shard_count`](#get_active_shard_count)
- [`get_shard_committee`](#get_shard_committee)
- [`compute_proposer_index`](#compute_proposer_index)
- [`get_shard_proposer_index`](#get_shard_proposer_index)
- [`get_start_shard`](#get_start_shard)
@ -369,24 +368,6 @@ def get_active_shard_count(state: BeaconState, epoch: Epoch) -> uint64:
return INITIAL_ACTIVE_SHARDS
```
#### `get_shard_committee`
```python
def get_shard_committee(beacon_state: BeaconState, epoch: Epoch, shard: Shard) -> Sequence[ValidatorIndex]:
"""
Return the shard committee of the given ``epoch`` of the given ``shard``.
"""
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)
return compute_committee(
indices=active_validator_indices,
seed=seed,
index=shard,
count=get_active_shard_count(beacon_state, epoch),
)
```
#### `compute_proposer_index`
Updated version to get a proposer index that will only allow proposers with a certain minimum balance,
@ -423,8 +404,7 @@ def get_shard_proposer_index(beacon_state: BeaconState, slot: Slot, shard: Shard
Return the proposer's index of shard block at ``slot``.
"""
epoch = compute_epoch_at_slot(slot)
committee = get_shard_committee(beacon_state, epoch, shard)
seed = hash(get_seed(beacon_state, epoch, DOMAIN_SHARD_PROPOSER) + uint_to_bytes(slot))
seed = hash(get_seed(beacon_state, epoch, DOMAIN_SHARD_PROPOSER) + uint_to_bytes(slot) + uint_to_bytes(shard))
# Proposer must have sufficient balance to pay for worst case fee burn
EFFECTIVE_BALANCE_MAX_DOWNWARD_DEVIATION = (
@ -435,7 +415,8 @@ def get_shard_proposer_index(beacon_state: BeaconState, slot: Slot, shard: Shard
beacon_state.shard_gasprice * MAX_SAMPLES_PER_BLOCK // TARGET_SAMPLES_PER_BLOCK
+ EFFECTIVE_BALANCE_MAX_DOWNWARD_DEVIATION
)
return compute_proposer_index(beacon_state, committee, seed, min_effective_balance)
indices = get_active_validator_indices(state, epoch)
return compute_proposer_index(beacon_state, indices, seed, min_effective_balance)
```
#### `get_start_shard`