def get_block_root(latest_block_roots: Sequence[Hash32],
current_slot: SlotNumber, slot: SlotNumber) -> Hash32:
"""
Returns the block root at a recent ``slot``.
"""
slot_relative_position = SlotNumber(current_slot - len(latest_block_roots))
return _get_element_from_recent_list(
latest_block_roots,
slot,
slot_relative_position,
)
def get_pending_validator(cls, pubkey: BLSPubkey,
withdrawal_credentials: Hash32,
randao_commitment: Hash32,
latest_status_change_slot: SlotNumber,
custody_commitment: Hash32) -> 'ValidatorRecord':
"""
Return a new pending ``ValidatorRecord`` with the given fields.
"""
return cls(
pubkey=pubkey,
withdrawal_credentials=withdrawal_credentials,
randao_commitment=randao_commitment,
randao_layers=0,
status=ValidatorStatusCode.PENDING_ACTIVATION,
latest_status_change_slot=latest_status_change_slot,
exit_count=0,
custody_commitment=custody_commitment,
latest_custody_reseed_slot=SlotNumber(0),
penultimate_custody_reseed_slot=SlotNumber(0),
)
def create_pending_validator(
cls, pubkey: BLSPubkey, withdrawal_credentials: Hash32,
randao_commitment: Hash32,
custody_commitment: Hash32) -> 'ValidatorRecord':
"""
Return a new pending ``ValidatorRecord`` with the given fields.
"""
return cls(
pubkey=pubkey,
withdrawal_credentials=withdrawal_credentials,
randao_commitment=randao_commitment,
randao_layers=0,
activation_slot=FAR_FUTURE_SLOT,
exit_slot=FAR_FUTURE_SLOT,
withdrawal_slot=FAR_FUTURE_SLOT,
penalized_slot=FAR_FUTURE_SLOT,
exit_count=0,
status_flags=0,
custody_commitment=custody_commitment,
latest_custody_reseed_slot=SlotNumber(0),
penultimate_custody_reseed_slot=SlotNumber(0),
)
def _get_shard_committees_at_slot(
state_slot: SlotNumber,
shard_committees_at_slots: Sequence[Sequence[ShardCommittee]],
slot: SlotNumber, epoch_length: int) -> Iterable[ShardCommittee]:
if len(shard_committees_at_slots) != epoch_length * 2:
raise ValueError(
"Length of shard_committees_at_slots != epoch_length * 2"
"\texpected: %s, found: %s" %
(epoch_length * 2, len(shard_committees_at_slots)))
slot_relative_position = SlotNumber(state_slot - epoch_length)
yield from _get_element_from_recent_list(
shard_committees_at_slots,
slot,
slot_relative_position,
)
from eth.beacon.typing import (
BLSSignature,
SlotNumber,
)
#
# shuffle function
#
# The size of 3 bytes in integer
# sample_range = 2 ** (3 * 8) = 2 ** 24 = 16777216
# sample_range = 16777216
# Entropy is consumed from the seed in 3-byte (24 bit) chunks.
RAND_BYTES = 3
# The highest possible result of the RNG.
RAND_MAX = 2**(RAND_BYTES * 8) - 1
EMPTY_SIGNATURE = BLSSignature((0, 0))
GWEI_PER_ETH = 10**9
FAR_FUTURE_SLOT = SlotNumber(2**64 - 1)
TARGET_COMMITTEE_SIZE=2**7, # (= 128) validators EJECTION_BALANCE=Ether(2**4), # (= 16) ETH MAX_BALANCE_CHURN_QUOTIENT=2**5, # (= 32) BEACON_CHAIN_SHARD_NUMBER=ShardNumber(2**64 - 1), MAX_CASPER_VOTES=2**10, # (= 1,024) votes LATEST_BLOCK_ROOTS_LENGTH=2**13, # (= 8,192) block roots LATEST_RANDAO_MIXES_LENGTH=2**13, # (= 8,192) randao mixes LATEST_PENALIZED_EXIT_LENGTH=2**13, # (= 8,192) randao mixes # Deposit contract DEPOSIT_CONTRACT_ADDRESS=ZERO_ADDRESS, # TBD DEPOSIT_CONTRACT_TREE_DEPTH=2**5, # (= 32) MIN_DEPOSIT=Ether(2**0), # (= 1) ETH MAX_DEPOSIT=Ether(2**5), # (= 32) ETH # Initial values GENESIS_FORK_VERSION=0, GENESIS_SLOT=SlotNumber(0), BLS_WITHDRAWAL_PREFIX_BYTE=b'\x00', # Time parameters SLOT_DURATION=Second(6), # seconds MIN_ATTESTATION_INCLUSION_DELAY=2**2, # (= 4) slots EPOCH_LENGTH=2**6, # (= 64) slots SEED_LOOKAHEAD=2**6, # (= 64) slots ENTRY_EXIT_DELAY=2**8, # (= 256) slots POW_RECEIPT_ROOT_VOTING_PERIOD=2**10, # (= 1,024) slots MIN_VALIDATOR_WITHDRAWAL_TIME=2**14, # (= 16,384) slots # Reward and penalty quotients BASE_REWARD_QUOTIENT=2**10, # (= 1,024) WHISTLEBLOWER_REWARD_QUOTIENT=2**9, # (= 512) INCLUDER_REWARD_QUOTIENT=2**3, # (= 8) INACTIVITY_PENALTY_QUOTIENT=2**24, # (= 16,777,216) # Max operations per block
TARGET_COMMITTEE_SIZE=2**7, # (= 128) validators EJECTION_BALANCE=Ether(2**4), # (= 16) ETH MAX_BALANCE_CHURN_QUOTIENT=2**5, # (= 32) BEACON_CHAIN_SHARD_NUMBER=ShardNumber(2**64 - 1), BLS_WITHDRAWAL_PREFIX_BYTE=b'\x00', MAX_CASPER_VOTES=2**10, # (= 1,024) votes LATEST_BLOCK_ROOTS_LENGTH=2**13, # (= 8,192) block roots LATEST_RANDAO_MIXES_LENGTH=2**13, # (= 8,192) randao mixes # Deposit contract DEPOSIT_CONTRACT_ADDRESS=ZERO_ADDRESS, # TBD DEPOSIT_CONTRACT_TREE_DEPTH=2**5, # (= 32) MIN_DEPOSIT=Ether(2**0), # (= 1) ETH MAX_DEPOSIT=Ether(2**5), # (= 32) ETH # Initial values INITIAL_FORK_VERSION=0, INITIAL_SLOT_NUMBER=SlotNumber(0), # Time parameters SLOT_DURATION=Second(6), # seconds MIN_ATTESTATION_INCLUSION_DELAY=2**2, # (= 4) slots EPOCH_LENGTH=2**6, # (= 64) slots POW_RECEIPT_ROOT_VOTING_PERIOD=2**10, # (= 1,024) slots SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD=2**17, # (= 131,072) slots COLLECTIVE_PENALTY_CALCULATION_PERIOD=2**20, # (= 1,048,576) slots ZERO_BALANCE_VALIDATOR_TTL=2**22, # (= 4,194,304) slots # Reward and penalty quotients BASE_REWARD_QUOTIENT=2**10, # (= 1,024) WHISTLEBLOWER_REWARD_QUOTIENT=2**9, # (= 512) INCLUDER_REWARD_QUOTIENT=2**3, # (= 8) INACTIVITY_PENALTY_QUOTIENT=2**24, # (= 16,777,216) # Max operations per block MAX_PROPOSER_SLASHINGS=2**4, # (= 16)