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make randao_mixes per epoch

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Danny Ryan 2019-01-27 10:22:27 -07:00
parent 8fbaa25596
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specs/core/0_beacon-chain.md
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@ -171,9 +171,9 @@ Code snippets appearing in `this style` are to be interpreted as Python code. Be
| `MAX_BALANCE_CHURN_QUOTIENT` | `2**5` (= 32) | - | | `MAX_BALANCE_CHURN_QUOTIENT` | `2**5` (= 32) | - |
| `BEACON_CHAIN_SHARD_NUMBER` | `2**64 - 1` | - | | `BEACON_CHAIN_SHARD_NUMBER` | `2**64 - 1` | - |
| `MAX_CASPER_VOTES` | `2**10` (= 1,024) | votes | | `MAX_CASPER_VOTES` | `2**10` (= 1,024) | votes |
| `LATEST_BLOCK_ROOTS_LENGTH` | `2**13` (= 8,192) | block roots | | `LATEST_BLOCK_ROOTS_LENGTH` | `2**13` (= 8,192) | slots |
| `LATEST_RANDAO_MIXES_LENGTH` | `2**13` (= 8,192) | randao mixes | | `LATEST_RANDAO_MIXES_LENGTH` | `2**13` (= 8,192) | epochs |
| `LATEST_INDEX_ROOTS_LENGTH` | `2**13` (= 8,192) | index roots | | `LATEST_INDEX_ROOTS_LENGTH` | `2**13` (= 8,192) | epochs |
| `LATEST_PENALIZED_EXIT_LENGTH` | `2**13` (= 8,192) | epochs | ~36 days | | `LATEST_PENALIZED_EXIT_LENGTH` | `2**13` (= 8,192) | epochs | ~36 days |
| `MAX_WITHDRAWALS_PER_EPOCH` | `2**2` (= 4) | withdrawals | | `MAX_WITHDRAWALS_PER_EPOCH` | `2**2` (= 4) | withdrawals |
@ -1027,13 +1027,13 @@ def get_block_root(state: BeaconState,
```python ```python
def get_randao_mix(state: BeaconState, def get_randao_mix(state: BeaconState,
slot: SlotNumber) -> Bytes32: epoch: EpochNumber) -> Bytes32:
""" """
Returns the randao mix at a recent ``slot``. Returns the randao mix at a recent ``slot``.
""" """
assert state.slot < slot + LATEST_RANDAO_MIXES_LENGTH assert get_current_epoch(state) < epoch + LATEST_RANDAO_MIXES_LENGTH
assert slot <= state.slot assert epoch <= get_current_epoch(state)
return state.latest_randao_mixes[slot % LATEST_RANDAO_MIXES_LENGTH] return state.latest_randao_mixes[epoch % LATEST_RANDAO_MIXES_LENGTH]
``` ```
#### `get_active_index_root` #### `get_active_index_root`
@ -1494,7 +1494,6 @@ Below are the processing steps that happen at every slot.
### Misc counters ### Misc counters
* Set `state.slot += 1`. * Set `state.slot += 1`.
* Set `state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH] = get_randao_mix(state, state.slot - 1)`.
### Block roots ### Block roots
@ -1520,7 +1519,7 @@ Below are the processing steps that happen at every `block`.
* Let `proposer = state.validator_registry[get_beacon_proposer_index(state, state.slot)]`. * Let `proposer = state.validator_registry[get_beacon_proposer_index(state, state.slot)]`.
* Verify that `bls_verify(pubkey=proposer.pubkey, message=int_to_bytes32(get_current_epoch(state)), signature=block.randao_reveal, domain=get_domain(state.fork, get_current_epoch(state), DOMAIN_RANDAO))`. * Verify that `bls_verify(pubkey=proposer.pubkey, message=int_to_bytes32(get_current_epoch(state)), signature=block.randao_reveal, domain=get_domain(state.fork, get_current_epoch(state), DOMAIN_RANDAO))`.
* Set `state.latest_randao_mixes[state.slot % LATEST_RANDAO_MIXES_LENGTH] = xor(get_randao_mix(state, state.slot), hash(block.randao_reveal))`. * Set `state.latest_randao_mixes[get_current_epoch(state) % LATEST_RANDAO_MIXES_LENGTH] = xor(get_randao_mix(state, get_current_epoch(state)), hash(block.randao_reveal))`.
### Eth1 data ### Eth1 data
@ -1902,6 +1901,7 @@ def process_penalties_and_exits(state: BeaconState) -> None:
### Final updates ### Final updates
* Set `state.latest_penalized_balances[(next_epoch) % LATEST_PENALIZED_EXIT_LENGTH] = state.latest_penalized_balances[current_epoch % LATEST_PENALIZED_EXIT_LENGTH]`. * Set `state.latest_penalized_balances[(next_epoch) % LATEST_PENALIZED_EXIT_LENGTH] = state.latest_penalized_balances[current_epoch % LATEST_PENALIZED_EXIT_LENGTH]`.
* Set `state.latest_randao_mixes[next_epoch % LATEST_RANDAO_MIXES_LENGTH] = get_randao_mix(state, current_epoch)`.
* Remove any `attestation` in `state.latest_attestations` such that `slot_to_epoch(attestation.data.slot) < current_epoch`. * Remove any `attestation` in `state.latest_attestations` such that `slot_to_epoch(attestation.data.slot) < current_epoch`.
## State root processing ## State root processing