def add_pending_validator(
state: BeaconState, validator: ValidatorRecord, deposit: Gwei,
zero_balance_validator_ttl: int) -> Tuple[BeaconState, ValidatorIndex]:
"""
Add a validator to the existing minimum empty validator index or
append to ``validator_registry``.
"""
# Check if there's empty validator index in `validator_registry`
try:
index = get_min_empty_validator_index(
state.validator_registry,
state.validator_balances,
state.slot,
zero_balance_validator_ttl,
)
except MinEmptyValidatorIndexNotFound:
index = None
# Append to the validator_registry
validator_registry = state.validator_registry + (validator, )
state = state.copy(validator_registry=validator_registry,
validator_balances=state.validator_balances +
(deposit, ))
index = ValidatorIndex(len(state.validator_registry) - 1)
else:
# Use the empty validator index
state = state.update_validator(index, validator, deposit)
return state, index
def process_attestations(state: BeaconState,
block: BaseBeaconBlock,
config: BeaconConfig) -> BeaconState:
"""
Implements 'per-block-processing.operations.attestations' portion of Phase 0 spec:
https://github.com/ethereum/eth2.0-specs/blob/master/specs/core/0_beacon-chain.md#attestations-1
Validate the ``attestations`` contained within the ``block`` in the context of ``state``.
If any invalid, throw ``ValidationError``.
Otherwise, append an ``PendingAttestationRecords`` for each to ``latest_attestations``.
Return resulting ``state``.
"""
for attestation in block.body.attestations:
validate_serenity_attestation(
state,
attestation,
config.EPOCH_LENGTH,
config.MIN_ATTESTATION_INCLUSION_DELAY,
config.LATEST_BLOCK_ROOTS_LENGTH,
)
# update_latest_attestations
additional_pending_attestations = tuple(
PendingAttestationRecord(
data=attestation.data,
participation_bitfield=attestation.participation_bitfield,
custody_bitfield=attestation.custody_bitfield,
slot_included=state.slot,
)
for attestation in block.body.attestations
)
state = state.copy(
latest_attestations=state.latest_attestations + additional_pending_attestations,
)
return state
def per_slot_transition(self,
state: BeaconState,
previous_block_root: Hash32) -> BeaconState:
# TODO
state = state.copy(
slot=state.slot + 1
)
return state
def add_pending_validator(state: BeaconState, validator: ValidatorRecord,
amount: Gwei) -> BeaconState:
"""
Add a validator to ``state``.
"""
state = state.copy(
validator_registry=state.validator_registry + (validator, ),
validator_balances=state.validator_balances + (amount, ),
)
return state
def process_attestations(state: BeaconState, block: BaseBeaconBlock,
config: BeaconConfig) -> BeaconState:
# TODO
# It's just for demo!!!
state = state.copy(slot=config.ZERO_BALANCE_VALIDATOR_TTL, )
return state