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Updated as per hww's suggestions

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vbuterin 2019-01-19 18:13:17 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -996,9 +996,11 @@ def get_active_index_root(state: BeaconState,
"""
Returns the index root at a recent ``slot``.
"""
assert state.slot // EPOCH_LENGTH < slot // EPOCH_LENGTH + LATEST_INDEX_ROOTS_LENGTH
assert slot // EPOCH_LENGTH <= state.slot // EPOCH_LENGTH
return state.latest_index_roots[(slot // EPOCH_LENGTH) % LATEST_INDEX_ROOTS_LENGTH]
state_epoch = state.slot // EPOCH_LENGTH
given_epoch = slot // EPOCH_LENGTH
assert state_epoch < given_epoch + LATEST_INDEX_ROOTS_LENGTH
assert given_epoch <= state_epoch
return state.latest_index_roots[given_epoch % LATEST_INDEX_ROOTS_LENGTH]
```
#### `get_beacon_proposer_index`
@ -1819,9 +1821,10 @@ def process_penalties_and_exits(state: BeaconState) -> None:
### Final updates
* Let `e = state.slot // EPOCH_LENGTH`. Set `state.latest_penalized_balances[(e+1) % LATEST_PENALIZED_EXIT_LENGTH] = state.latest_penalized_balances[e % LATEST_PENALIZED_EXIT_LENGTH]`
* Let `epoch = state.slot // EPOCH_LENGTH`.
* Set `state.latest_penalized_balances[(epoch+1) % LATEST_PENALIZED_EXIT_LENGTH] = state.latest_penalized_balances[epoch % LATEST_PENALIZED_EXIT_LENGTH]`
* Remove any `attestation` in `state.latest_attestations` such that `attestation.data.slot < state.slot - EPOCH_LENGTH`.
* Let `epoch = state.slot // EPOCH_LENGTH`. Set `state.latest_index_roots[epoch % LATEST_INDEX_ROOTS_LENGTH] = hash_tree_root(get_active_validator_indices(state, state.slot))`
* Set `state.latest_index_roots[epoch % LATEST_INDEX_ROOTS_LENGTH] = hash_tree_root(get_active_validator_indices(state, state.slot))`
## State root processing