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make get_beacon_proposer_index safe for next epoch #694

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merged 2 commits into from
Mar 4, 2019
Merged

make get_beacon_proposer_index safe for next epoch #694

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b2c5304
make get_beacon_proposer_index safe for next epoch
djrtwo Feb 26, 2019
34091d7
Fix typo
hwwhww Feb 28, 2019
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13 changes: 11 additions & 2 deletions specs/core/0_beacon-chain.md
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,7 @@
- [Helper functions](#helper-functions)
- [`hash`](#hash)
- [`hash_tree_root`](#hash_tree_root)
- [`signed_root`](#signed_root)
- [`slot_to_epoch`](#slot_to_epoch)
- [`get_previous_epoch`](#get_previous_epoch)
- [`get_current_epoch`](#get_current_epoch)
Expand Down Expand Up @@ -967,11 +968,19 @@ def generate_seed(state: BeaconState,

```python
def get_beacon_proposer_index(state: BeaconState,
slot: Slot) -> ValidatorIndex:
slot: Slot,
registry_change: bool=False) -> ValidatorIndex:
"""
Return the beacon proposer index for the ``slot``.
"""
first_committee, _ = get_crosslink_committees_at_slot(state, slot)[0]
epoch = slot_to_epoch(slot)
current_epoch = get_current_epoch(state)
previous_epoch = get_previous_epoch(state)
next_epoch = current_epoch + 1

assert previous_epoch <= epoch <= next_epoch

first_committee, _ = get_crosslink_committees_at_slot(state, slot, registry_change)[0]
return first_committee[slot % len(first_committee)]
```

Expand Down
5 changes: 2 additions & 3 deletions specs/validator/0_beacon-chain-validator.md
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Expand Up @@ -50,7 +50,7 @@ __NOTICE__: This document is a work-in-progress for researchers and implementers
- [Aggregation bitfield](#aggregation-bitfield)
- [Custody bitfield](#custody-bitfield)
- [Aggregate signature](#aggregate-signature)
- [Validator assigments](#validator-assignments)
- [Validator assignments](#validator-assignments)
- [Lookahead](#lookahead)
- [How to avoid slashing](#how-to-avoid-slashing)
- [Proposer slashing](#proposer-slashing)
Expand Down Expand Up @@ -371,8 +371,7 @@ def get_committee_assignment(
if len(selected_committees) > 0:
validators = selected_committees[0][0]
shard = selected_committees[0][1]
first_committee_at_slot = crosslink_committees[0][0] # List[ValidatorIndex]
is_proposer = first_committee_at_slot[slot % len(first_committee_at_slot)] == validator_index
is_proposer = validator_index == get_beacon_proposer_index(state, slot, registry_change=registry_change)

assignment = (validators, shard, slot, is_proposer)
return assignment
Expand Down