Status code / slot reorganization
* Added `activation_slot`, `exit_slot`, `penalized_slot`, `withdrawal_slot`, use these to determine if a validator is active * Universal min activation/exit delay of 256 slots * Min exit time of ~1 day, but penalization delays this to ~18 days * Penalty calculation period of `[time penalized - 18 days, time penalized + 18 days]`; made the total penalties array fixed size and wraparound to make calculation more fine-grained * Processes withdrawals in all epochs, not just dynasty-changing epochs * Change `get_shuffling` function to take slot as argument Not yet done: * Removed `shard_committees` from the state * Removed persistent committees from the state
This commit is contained in:
vbuterin
GitHub
parent
6b84dae09e
commit
d9e897bbcb
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@ -66,7 +66,7 @@
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- [`get_active_validator_indices`](#get_active_validator_indices)
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- [`shuffle`](#shuffle)
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- [`split`](#split)
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- [`get_new_shuffling`](#get_new_shuffling)
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- [`get_shuffling`](#get_shuffling)
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- [`get_shard_committees_at_slot`](#get_shard_committees_at_slot)
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- [`get_block_root`](#get_block_root)
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- [`get_beacon_proposer_index`](#get_beacon_proposer_index)
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@ -168,6 +168,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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| `MAX_CASPER_VOTES` | `2**10` (= 1,024) | votes |
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| `LATEST_BLOCK_ROOTS_LENGTH` | `2**13` (= 8,192) | block roots |
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| `LATEST_RANDAO_MIXES_LENGTH` | `2**13` (= 8,192) | randao mixes |
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| `LATEST_PENALIZED_EXIT_LENGTH` | `2**13` (= 8,192) | cycles | ~36 days |
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| `EMPTY_SIGNATURE` | `[bytes48(0), bytes48(0)]` | - |
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* For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf); with sufficient active validators (at least `EPOCH_LENGTH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.)
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@ -188,6 +189,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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| `INITIAL_FORK_VERSION` | `0` |
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| `INITIAL_SLOT_NUMBER` | `0` |
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| `ZERO_HASH` | `bytes([0] * 32)` |
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| `FAR_FUTURE_SLOT` | `2**63` |
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### Time parameters
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@ -196,9 +198,10 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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| `SLOT_DURATION` | `6` | seconds | 6 seconds |
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| `MIN_ATTESTATION_INCLUSION_DELAY` | `2**2` (= 4) | slots | 24 seconds |
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| `EPOCH_LENGTH` | `2**6` (= 64) | slots | 6.4 minutes |
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| `SEED_LOOKAHEAD` | `2**6` (= 64) | slots | 6.4 minutes |
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| `ENTRY_EXIT_DELAY` | `2**8` (= 256) | slots | 25.6 minutes |
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| `POW_RECEIPT_ROOT_VOTING_PERIOD` | `2**10` (= 1,024) | slots | ~1.7 hours |
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| `SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD` | `2**17` (= 131,072) | slots | ~9 days |
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| `COLLECTIVE_PENALTY_CALCULATION_PERIOD` | `2**20` (= 1,048,576) | slots | ~73 days |
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| `ZERO_BALANCE_VALIDATOR_TTL` | `2**22` (= 4,194,304) | slots | ~291 days |
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### Reward and penalty quotients
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@ -213,15 +216,13 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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* The `BASE_REWARD_QUOTIENT` parameter dictates the per-epoch reward. It corresponds to ~2.54% annual interest assuming 10 million participating ETH in every epoch.
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* The `INACTIVITY_PENALTY_QUOTIENT` equals `INVERSE_SQRT_E_DROP_TIME**2` where `INVERSE_SQRT_E_DROP_TIME := 2**12 epochs` (~18 days) is the time it takes the inactivity penalty to reduce the balance of non-participating [validators](#dfn-validator) to about `1/sqrt(e) ~= 60.6%`. Indeed, the balance retained by offline [validators](#dfn-validator) after `n` epochs is about `(1-1/INACTIVITY_PENALTY_QUOTIENT)**(n**2/2)` so after `INVERSE_SQRT_E_DROP_TIME` epochs it is roughly `(1-1/INACTIVITY_PENALTY_QUOTIENT)**(INACTIVITY_PENALTY_QUOTIENT/2) ~= 1/sqrt(e)`.
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### Status codes
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### Status flags
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| Name | Value |
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| - | - |
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| `PENDING_ACTIVATION` | `0` |
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| `ACTIVE` | `1` |
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| `ACTIVE_PENDING_EXIT` | `2` |
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| `EXITED_WITHOUT_PENALTY` | `3` |
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| `EXITED_WITH_PENALTY` | `4` |
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| `INITIATED_EXIT` | `2**0` (= 1) |
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| `WITHDRAWABLE` | `2**1` (= 2) |
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### Max operations per block
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@ -521,12 +522,18 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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'randao_commitment': 'hash32',
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# Slots the proposer has skipped (i.e. layers of RANDAO expected)
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'randao_layers': 'uint64',
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# Status code
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'status': 'uint64',
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# Slot when validator last changed status (or 0)
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'latest_status_change_slot': 'uint64',
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# Exit counter when validator exited (or 0)
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# Slot when validator activated
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'activation_slot': 'uint64',
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# Slot when validator exited
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'exit_slot': 'uint64',
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# Slot when validator withdrew
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'withdrawal_slot': 'uint64',
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# Slot when validator was penalized
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'penalized_slot': 'uint64',
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# Exit counter when validator exited
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'exit_count': 'uint64',
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# Status flags
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'status_flags': 'uint64',
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# Proof of custody commitment
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'poc_commitment': 'hash32',
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# Slot the proof of custody seed was last changed
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@ -618,6 +625,7 @@ Unless otherwise indicated, code appearing in `this style` is to be interpreted
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latest_registry_delta_root: 'hash32',
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validator_index: 'uint24',
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pubkey: 'uint384',
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slot: 'uint64',
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flag: 'uint64',
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}
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```
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@ -738,7 +746,7 @@ The beacon chain fork choice rule is a hybrid that combines justification and fi
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def lmd_ghost(store, start):
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validators = start.state.validator_registry
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active_validators = [validators[i] for i in
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get_active_validator_indices(validators)]
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get_active_validator_indices(validators, start.state.slot)]
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attestation_targets = [get_latest_attestation_target(store, validator)
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for validator in active_validators]
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def get_vote_count(block):
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@ -778,21 +786,21 @@ Note: We aim to migrate to a S[T/N]ARK-friendly hash function in a future Ethere
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#### `is_active_validator`
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```python
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def is_active_validator(validator: ValidatorRecord) -> bool:
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def is_active_validator(validator: ValidatorRecord, slot: int) -> bool:
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"""
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Checks if ``validator`` is active.
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"""
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return validator.status in [ACTIVE, ACTIVE_PENDING_EXIT]
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return validator.activation_slot <= slot < validator.exit_slot
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```
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#### `get_active_validator_indices`
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```python
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def get_active_validator_indices(validators: [ValidatorRecord]) -> List[int]:
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def get_active_validator_indices(validators: [ValidatorRecord], slot: int) -> List[int]:
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"""
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Gets indices of active validators from ``validators``.
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"""
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return [i for i, v in enumerate(validators) if is_active_validator(v)]
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return [i for i, v in enumerate(validators) if is_active_validator(v, slot)]
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```
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#### `shuffle`
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@ -862,16 +870,17 @@ def split(values: List[Any], split_count: int) -> List[Any]:
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]
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```
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#### `get_new_shuffling`
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#### `get_shuffling`
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```python
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def get_new_shuffling(seed: Hash32,
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validators: List[ValidatorRecord],
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crosslinking_start_shard: int) -> List[List[ShardCommittee]]:
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def get_shuffling(seed: Hash32,
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validators: List[ValidatorRecord],
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crosslinking_start_shard: int,
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slot: int) -> List[List[ShardCommittee]]:
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"""
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Shuffles ``validators`` into shard committees using ``seed`` as entropy.
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"""
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active_validator_indices = get_active_validator_indices(validators)
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active_validator_indices = get_active_validator_indices(validators, slot)
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committees_per_slot = max(
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1,
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@ -907,6 +916,8 @@ def get_new_shuffling(seed: Hash32,
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return output
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```
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**Invariant**: if `get_shuffling(seed, validators, shard, slot)` returns some value `x`, it should return the same value `x` for the same `seed` and `shard` and possible future modifications of `validators` forever in phase 0, and until the ~1 year deletion delay in phase 1 and in the future.
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Here's a diagram of what is going on:
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@ -1008,6 +1019,7 @@ def get_effective_balance(state: State, index: int) -> int:
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def get_new_validator_registry_delta_chain_tip(current_validator_registry_delta_chain_tip: Hash32,
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validator_index: int,
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pubkey: int,
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slot: int,
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flag: int) -> Hash32:
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"""
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Compute the next root in the validator registry delta chain.
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@ -1017,6 +1029,7 @@ def get_new_validator_registry_delta_chain_tip(current_validator_registry_delta_
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latest_registry_delta_root=current_validator_registry_delta_chain_tip,
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validator_index=validator_index,
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pubkey=pubkey,
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slot=slot,
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flag=flag,
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)
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)
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@ -1196,7 +1209,7 @@ def get_initial_beacon_state(initial_validator_deposits: List[Deposit],
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# Recent state
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latest_crosslinks=[CrosslinkRecord(slot=INITIAL_SLOT_NUMBER, shard_block_root=ZERO_HASH) for _ in range(SHARD_COUNT)],
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latest_block_roots=[ZERO_HASH for _ in range(LATEST_BLOCK_ROOTS_LENGTH)],
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latest_penalized_exit_balances=[],
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latest_penalized_exit_balances=[0 for _ in LATEST_PENALIZED_EXIT_LENGTH],
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latest_attestations=[],
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batched_block_roots=[],
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@ -1217,14 +1230,14 @@ def get_initial_beacon_state(initial_validator_deposits: List[Deposit],
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poc_commitment=deposit.deposit_data.deposit_input.poc_commitment,
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)
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if get_effective_balance(state, validator_index) == MAX_DEPOSIT * GWEI_PER_ETH:
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update_validator_status(state, validator_index, ACTIVE)
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activate_validator(state, validator_index)
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# set initial committee shuffling
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initial_shuffling = get_new_shuffling(ZERO_HASH, state.validator_registry, 0)
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initial_shuffling = get_shuffling(ZERO_HASH, state.validator_registry, 0, INITIAL_SLOT_NUMBER)
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state.shard_committees_at_slots = initial_shuffling + initial_shuffling
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# set initial persistent shuffling
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active_validator_indices = get_active_validator_indices(state.validator_registry)
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active_validator_indices = get_active_validator_indices(state.validator_registry, state.slot)
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state.persistent_committees = split(shuffle(active_validator_indices, ZERO_HASH), SHARD_COUNT)
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return state
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@ -1238,8 +1251,8 @@ First, two helper functions:
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def min_empty_validator_index(validators: List[ValidatorRecord],
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validator_balances: List[int],
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current_slot: int) -> int:
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for i, (v, vbal) in enumerate(zip(validators, validator_balances)):
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if vbal == 0 and v.latest_status_change_slot + ZERO_BALANCE_VALIDATOR_TTL <= current_slot:
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for i, v in enumerate(validators):
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if v.withdrawal_slot + ZERO_BALANCE_VALIDATOR_TTL <= current_slot:
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return i
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return None
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```
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@ -1304,8 +1317,10 @@ def process_deposit(state: BeaconState,
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withdrawal_credentials=withdrawal_credentials,
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randao_commitment=randao_commitment,
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randao_layers=0,
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status=PENDING_ACTIVATION,
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latest_status_change_slot=state.slot,
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activation_slot=FAR_FUTURE_SLOT,
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exit_slot=FAR_FUTURE_SLOT,
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withdrawal_slot=FAR_FUTURE_SLOT,
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penalized_slot=FAR_FUTURE_SLOT,
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exit_count=0,
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poc_commitment=poc_commitment,
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last_poc_change_slot=0,
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@ -1330,26 +1345,7 @@ def process_deposit(state: BeaconState,
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return index
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```
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### Routine for updating validator status
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```python
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def update_validator_status(state: BeaconState,
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index: int,
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new_status: int) -> None:
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"""
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Update the validator status with the given ``index`` to ``new_status``.
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Handle other general accounting related to this status update.
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Note that this function mutates ``state``.
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"""
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if new_status == ACTIVE:
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activate_validator(state, index)
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if new_status == ACTIVE_PENDING_EXIT:
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initiate_validator_exit(state, index)
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if new_status in [EXITED_WITH_PENALTY, EXITED_WITHOUT_PENALTY]:
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exit_validator(state, index, new_status)
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```
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The following are helpers and should only be called via `update_validator_status`:
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### Routines for updating validator status
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```python
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def activate_validator(state: BeaconState,
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@ -1359,15 +1355,15 @@ def activate_validator(state: BeaconState,
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Note that this function mutates ``state``.
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"""
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validator = state.validator_registry[index]
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if validator.status != PENDING_ACTIVATION:
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if validator.activation_slot <= state.slot:
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return
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validator.status = ACTIVE
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validator.latest_status_change_slot = state.slot
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validator.activation_slot = state.slot + ENTRY_EXIT_DELAY
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state.validator_registry_delta_chain_tip = get_new_validator_registry_delta_chain_tip(
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current_validator_registry_delta_chain_tip=state.validator_registry_delta_chain_tip,
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validator_index=index,
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pubkey=validator.pubkey,
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slot=validator.activation_slot,
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flag=ACTIVATION,
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)
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```
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@ -1380,40 +1376,22 @@ def initiate_validator_exit(state: BeaconState,
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Note that this function mutates ``state``.
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"""
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validator = state.validator_registry[index]
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if validator.status != ACTIVE:
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return
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validator.status = ACTIVE_PENDING_EXIT
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validator.latest_status_change_slot = state.slot
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validator.status_flags |= INITIATED_EXIT
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```
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```python
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def exit_validator(state: BeaconState,
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index: int,
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new_status: int) -> None:
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index: int) -> None:
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"""
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Exit the validator with the given ``index``.
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Note that this function mutates ``state``.
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"""
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validator = state.validator_registry[index]
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prev_status = validator.status
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if prev_status == EXITED_WITH_PENALTY:
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return
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validator.status = new_status
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validator.latest_status_change_slot = state.slot
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if new_status == EXITED_WITH_PENALTY:
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state.latest_penalized_exit_balances[state.slot // COLLECTIVE_PENALTY_CALCULATION_PERIOD] += get_effective_balance(state, index)
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whistleblower_index = get_beacon_proposer_index(state, state.slot)
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whistleblower_reward = get_effective_balance(state, index) // WHISTLEBLOWER_REWARD_QUOTIENT
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state.validator_balances[whistleblower_index] += whistleblower_reward
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state.validator_balances[index] -= whistleblower_reward
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if prev_status == EXITED_WITHOUT_PENALTY:
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if validator.exit_slot < state.slot + ENTRY_EXIT_DELAY:
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return
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validator.exit_slot = state.slot + ENTRY_EXIT_DELAY
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# The following updates only occur if not previous exited
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state.validator_registry_exit_count += 1
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@ -1422,8 +1400,10 @@ def exit_validator(state: BeaconState,
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current_validator_registry_delta_chain_tip=state.validator_registry_delta_chain_tip,
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validator_index=index,
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pubkey=validator.pubkey,
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slot=validator.exit_slot,
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flag=EXIT,
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)
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state.validator_registry_exit_count += 1
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# Remove validator from persistent committees
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for committee in state.persistent_committees:
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@ -1433,6 +1413,27 @@ def exit_validator(state: BeaconState,
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break
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```
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```python
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def penalize_validator(state: BeaconState,
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index: int) -> None:
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exit_validator(state, index)
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state.latest_penalized_exit_balances[(state.slot // EPOCH_LENGTH) % LATEST_PENALIZED_EXIT_LENGTH] += get_effective_balance(state, index)
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whistleblower_index = get_beacon_proposer_index(state, state.slot)
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whistleblower_reward = get_effective_balance(state, index) // WHISTLEBLOWER_REWARD_QUOTIENT
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state.validator_balances[whistleblower_index] += whistleblower_reward
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state.validator_balances[index] -= whistleblower_reward
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state.validator_registry[index].penalized_slot = state.slot
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```
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```python
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def set_validator_withdrawable(state: BeaconState,
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index: int) -> None:
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state.validator_registry[index].status_flags |= WITHDRAWABLE
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```
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## Per-slot processing
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Below are the processing steps that happen at every slot.
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|
|
@ -1492,7 +1493,7 @@ For each `proposer_slashing` in `block.body.proposer_slashings`:
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* Verify that `proposer.status != EXITED_WITH_PENALTY`.
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* Verify that `bls_verify(pubkey=proposer.pubkey, message=hash_tree_root(proposer_slashing.proposal_data_1), signature=proposer_slashing.proposal_signature_1, domain=get_domain(state.fork_data, proposer_slashing.proposal_data_1.slot, DOMAIN_PROPOSAL))`.
|
||||
* Verify that `bls_verify(pubkey=proposer.pubkey, message=hash_tree_root(proposer_slashing.proposal_data_2), signature=proposer_slashing.proposal_signature_2, domain=get_domain(state.fork_data, proposer_slashing.proposal_data_2.slot, DOMAIN_PROPOSAL))`.
|
||||
* Run `update_validator_status(state, proposer_slashing.proposer_index, new_status=EXITED_WITH_PENALTY)`.
|
||||
* Run `penalize_validator(state, proposer_slashing.proposer_index)`.
|
||||
|
||||
#### Casper slashings
|
||||
|
||||
|
|
@ -1509,7 +1510,7 @@ For each `casper_slashing` in `block.body.casper_slashings`:
|
|||
* Verify that `is_double_vote(slashable_vote_data_1.data, slashable_vote_data_2.data)` or `is_surround_vote(slashable_vote_data_1.data, slashable_vote_data_2.data)`.
|
||||
* Verify that `verify_slashable_vote_data(state, slashable_vote_data_1)`.
|
||||
* Verify that `verify_slashable_vote_data(state, slashable_vote_data_2)`.
|
||||
* For each [validator](#dfn-validator) index `i` in `intersection`, if `state.validator_registry[i].status` does not equal `EXITED_WITH_PENALTY`, then run `update_validator_status(state, i, new_status=EXITED_WITH_PENALTY)`
|
||||
* For each [validator](#dfn-validator) index `i` in `intersection`, if `state.validator_registry[i].status` does not equal `EXITED_WITH_PENALTY`, then run `penalize_validator(state, i)`.
|
||||
|
||||
#### Attestations
|
||||
|
||||
|
|
@ -1573,11 +1574,10 @@ Verify that `len(block.body.exits) <= MAX_EXITS`.
|
|||
For each `exit` in `block.body.exits`:
|
||||
|
||||
* Let `validator = state.validator_registry[exit.validator_index]`.
|
||||
* Verify that `validator.status == ACTIVE`.
|
||||
* Verify that `validator.exit_slot > state.slot + ENTRY_EXIT_DELAY`.
|
||||
* Verify that `state.slot >= exit.slot`.
|
||||
* Verify that `state.slot >= validator.latest_status_change_slot + SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD`.
|
||||
* Verify that `bls_verify(pubkey=validator.pubkey, message=ZERO_HASH, signature=exit.signature, domain=get_domain(state.fork_data, exit.slot, DOMAIN_EXIT))`.
|
||||
* Run `update_validator_status(state, validator_index, new_status=ACTIVE_PENDING_EXIT)`.
|
||||
* Run `initiate_validator_exit(state, validator_index)`.
|
||||
|
||||
#### Miscellaneous
|
||||
|
||||
|
|
@ -1591,7 +1591,7 @@ The steps below happen when `state.slot % EPOCH_LENGTH == 0`.
|
|||
|
||||
All [validators](#dfn-validator):
|
||||
|
||||
* Let `active_validator_indices = get_active_validator_indices(state.validator_registry)`.
|
||||
* Let `active_validator_indices = get_active_validator_indices(state.validator_registry, state.slot)`.
|
||||
* Let `total_balance = sum([get_effective_balance(state, i) for i in active_validator_indices])`.
|
||||
|
||||
[Validators](#dfn-Validator) attesting during the current epoch:
|
||||
|
|
@ -1718,7 +1718,7 @@ def process_ejections(state: BeaconState) -> None:
|
|||
"""
|
||||
for index in active_validator_indices(state.validator_registry):
|
||||
if state.validator_balances[index] < EJECTION_BALANCE:
|
||||
update_validator_status(state, index, new_status=EXITED_WITHOUT_PENALTY)
|
||||
exit_validator(state, index)
|
||||
```
|
||||
|
||||
### Validator registry
|
||||
|
|
@ -1737,7 +1737,7 @@ def update_validator_registry(state: BeaconState) -> None:
|
|||
Note that this function mutates ``state``.
|
||||
"""
|
||||
# The active validators
|
||||
active_validator_indices = get_active_validator_indices(state.validator_registry)
|
||||
active_validator_indices = get_active_validator_indices(state.validator_registry, state.slot)
|
||||
# The total effective balance of active validators
|
||||
total_balance = sum([get_effective_balance(state, i) for i in active_validator_indices])
|
||||
|
||||
|
|
@ -1750,65 +1750,89 @@ def update_validator_registry(state: BeaconState) -> None:
|
|||
# Activate validators within the allowable balance churn
|
||||
balance_churn = 0
|
||||
for index, validator in enumerate(state.validator_registry):
|
||||
if validator.status == PENDING_ACTIVATION and state.validator_balances[index] >= MAX_DEPOSIT * GWEI_PER_ETH:
|
||||
if validator.activation_slot > state.slot and state.validator_balances[index] >= MAX_DEPOSIT * GWEI_PER_ETH:
|
||||
# Check the balance churn would be within the allowance
|
||||
balance_churn += get_effective_balance(state, index)
|
||||
if balance_churn > max_balance_churn:
|
||||
break
|
||||
|
||||
# Activate validator
|
||||
update_validator_status(state, index, new_status=ACTIVE)
|
||||
activate_validator(state, index)
|
||||
|
||||
# Exit validators within the allowable balance churn
|
||||
balance_churn = 0
|
||||
for index, validator in enumerate(state.validator_registry):
|
||||
if validator.status == ACTIVE_PENDING_EXIT:
|
||||
if validator.exit_slot > state.slot + ENTRY_EXIT_DELAY and validator.status_flags & INITIATED_EXIT:
|
||||
# Check the balance churn would be within the allowance
|
||||
balance_churn += get_effective_balance(state, index)
|
||||
if balance_churn > max_balance_churn:
|
||||
break
|
||||
|
||||
# Exit validator
|
||||
update_validator_status(state, index, new_status=EXITED_WITHOUT_PENALTY)
|
||||
exit_validator(state, index)
|
||||
```
|
||||
|
||||
Regardless of whether the above conditions are satisfied, run the following:
|
||||
|
||||
# Calculate the total ETH that has been penalized in the last ~2-3 withdrawal periods
|
||||
period_index = current_slot // COLLECTIVE_PENALTY_CALCULATION_PERIOD
|
||||
total_penalties = (
|
||||
(latest_penalized_exit_balances[period_index]) +
|
||||
(latest_penalized_exit_balances[period_index - 1] if period_index >= 1 else 0) +
|
||||
(latest_penalized_exit_balances[period_index - 2] if period_index >= 2 else 0)
|
||||
)
|
||||
```python
|
||||
def process_penalties_and_exits(state: BeaconState) -> None:
|
||||
|
||||
# Calculate penalties for slashed validators
|
||||
def to_penalize(index):
|
||||
return state.validator_registry[index].status == EXITED_WITH_PENALTY
|
||||
validators_to_penalize = filter(to_penalize, range(len(validator_registry)))
|
||||
for index in validators_to_penalize:
|
||||
state.validator_balances[index] -= get_effective_balance(state, index) * min(total_penalties * 3, total_balance) // total_balance
|
||||
# The active validators
|
||||
active_validator_indices = get_active_validator_indices(state.validator_registry, state.slot)
|
||||
# The total effective balance of active validators
|
||||
total_balance = sum([get_effective_balance(state, i) for i in active_validator_indices])
|
||||
|
||||
return validator_registry, latest_penalized_exit_balances, validator_registry_delta_chain_tip
|
||||
for i, validator in enumerate(validators):
|
||||
if (state.slot // EPOCH_LENGTH) - (validator.penalized_slot // EPOCH_LENGTH) == LATEST_PENALIZED_EXIT_LENGTH // 2:
|
||||
e = (state.slot // EPOCH_LENGTH) % LATEST_PENALIZED_EXIT_LENGTH
|
||||
total_at_start = state.latest_penalized_exit_balances[(e+1)%LATEST_PENALIZED_EXIT_LENGTH]
|
||||
total_at_end = state.latest_penalized_exit_balances[e]
|
||||
total_penalties = total_at_end - total_at_start
|
||||
penalty = get_effective_balance(state, i) * min(total_penalties * 3, total_balance) // total_balance
|
||||
state.validator_balances[index] -= penalty
|
||||
|
||||
def eligible(index):
|
||||
validator = state.validator_registry[index]
|
||||
if validator.penalized_slot <= state.slot:
|
||||
PENALIZED_WITHDRAWAL_TIME = LATEST_PENALIZED_EXIT_LENGTH * EPOCH_LENGTH // 2
|
||||
return state.slot >= validator.penalized_slot + PENALIZED_WITHDRAWAL_TIME
|
||||
else:
|
||||
return state.slot >= validator.exit_slot + MIN_VALIDATOR_WITHDRAWAL_TIME
|
||||
|
||||
eligible_indices = filter(eligible, all_indices)
|
||||
sorted_indices = sorted(eligible_indices, filter=lambda index: state.validator_registry[index].exit_count)
|
||||
withdrawn_so_far = 0
|
||||
for index in sorted_indices:
|
||||
validator = state.validator_registry[index]
|
||||
if validator.status == EXITED_WITH_PENALTY:
|
||||
# TODO: calculate and apply penalties for slashed validators
|
||||
penalty = 1
|
||||
state.validator_balances[index] -= penalty
|
||||
set_validator_withdrawable(state, index)
|
||||
withdrawn_so_far += 1
|
||||
if withdrawn_so_far >= MAX_WITHDRAWALS_PER_EPOCH:
|
||||
break
|
||||
```
|
||||
|
||||
Also perform the following updates:
|
||||
|
||||
* Set `state.validator_registry_latest_change_slot = state.slot`.
|
||||
* Set `state.shard_committees_at_slots[:EPOCH_LENGTH] = state.shard_committees_at_slots[EPOCH_LENGTH:]`.
|
||||
* Set `state.shard_committees_at_slots[EPOCH_LENGTH:] = get_new_shuffling(state.latest_randao_mixes[(state.slot - EPOCH_LENGTH) % LATEST_RANDAO_MIXES_LENGTH], state.validator_registry, next_start_shard)` where `next_start_shard = (state.shard_committees_at_slots[-1][-1].shard + 1) % SHARD_COUNT`.
|
||||
* Set `state.shard_committees_at_slots[EPOCH_LENGTH:] = get_shuffling(state.latest_randao_mixes[(state.slot - EPOCH_LENGTH) % LATEST_RANDAO_MIXES_LENGTH], state.validator_registry, next_start_shard, state.slot)` where `next_start_shard = (state.shard_committees_at_slots[-1][-1].shard + 1) % SHARD_COUNT`.
|
||||
|
||||
If a validator registry update does _not_ happen do the following:
|
||||
|
||||
* Set `state.shard_committees_at_slots[:EPOCH_LENGTH] = state.shard_committees_at_slots[EPOCH_LENGTH:]`.
|
||||
* Let `epochs_since_last_registry_change = (state.slot - state.validator_registry_latest_change_slot) // EPOCH_LENGTH`.
|
||||
* Let `start_shard = state.shard_committees_at_slots[0][0].shard`.
|
||||
* If `epochs_since_last_registry_change` is an exact power of 2, set `state.shard_committees_at_slots[EPOCH_LENGTH:] = get_new_shuffling(state.latest_randao_mixes[(state.slot - EPOCH_LENGTH) % LATEST_RANDAO_MIXES_LENGTH], state.validator_registry, start_shard)`. Note that `start_shard` is not changed from the last epoch.
|
||||
* If `epochs_since_last_registry_change` is an exact power of 2, set `state.shard_committees_at_slots[EPOCH_LENGTH:] = get_shuffling(state.latest_randao_mixes[(state.slot - EPOCH_LENGTH) % LATEST_RANDAO_MIXES_LENGTH], state.validator_registry, start_shard, state.slot)`. Note that `start_shard` is not changed from the last epoch.
|
||||
|
||||
### Proposer reshuffling
|
||||
|
||||
Run the following code to update the shard proposer set:
|
||||
|
||||
```python
|
||||
active_validator_indices = get_active_validator_indices(state.validator_registry)
|
||||
active_validator_indices = get_active_validator_indices(state.validator_registry, state.slot)
|
||||
num_validators_to_reshuffle = len(active_validator_indices) // SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD
|
||||
for i in range(num_validators_to_reshuffle):
|
||||
# Multiplying i to 2 to ensure we have different input to all the required hashes in the shuffling
|
||||
|
|
@ -1832,6 +1856,7 @@ while len(state.persistent_committee_reassignments) > 0 and state.persistent_com
|
|||
|
||||
### Final updates
|
||||
|
||||
* Let `e = state.slot // EPOCH_LENGTH`. Set `state.latest_penalized_exit_balances[(e+1) % LATEST_PENALIZED_EXIT_LENGTH] = state.latest_penalized_exit_balances[e % LATEST_PENALIZED_EXIT_LENGTH]`
|
||||
* Remove any `attestation` in `state.latest_attestations` such that `attestation.data.slot < state.slot - EPOCH_LENGTH`.
|
||||
|
||||
## State root processing
|
||||
|
|
|
|||
Loading…
Reference in New Issue