def test_validate_bitfield(attestation_validation_fixture, cycle_length):
(
crystallized_state,
_,
attestation,
_,
_,
_,
) = attestation_validation_fixture
attestation_indices = get_attestation_indices(
crystallized_state,
attestation,
cycle_length,
)
# Case 1: Attestation has incorrect bitfield length
attestation_case_1 = attestation.copy(
attester_bitfield=get_empty_bitfield(10), )
with pytest.raises(ValidationError):
validate_bitfield(attestation_case_1, attestation_indices)
# Case 2: End bits are not all zero
last_bit = len(attestation_indices)
attestation_case_2 = attestation.copy(attester_bitfield=set_voted(
attestation.attester_bitfield, last_bit), )
with pytest.raises(ValidationError):
validate_bitfield(attestation_case_2, attestation_indices)
def test_validate_attestation_aggregate_sig(attestation_validation_fixture,
cycle_length):
(crystallized_state, active_state, attestation, block, _,
_) = attestation_validation_fixture
attestation_indices = get_attestation_indices(
crystallized_state,
attestation,
cycle_length,
)
parent_hashes = get_signed_parent_hashes(
active_state.recent_block_hashes,
block,
attestation,
cycle_length,
)
attestation = attestation.copy(aggregate_sig=[0, 0])
with pytest.raises(ValidationError):
validate_aggregate_sig(
crystallized_state,
attestation,
attestation_indices,
parent_hashes,
)
def validate_attestation(block: BaseBeaconBlock,
parent_block: BaseBeaconBlock,
crystallized_state: CrystallizedState,
recent_block_hashes: Iterable[Hash32],
attestation: 'AttestationRecord',
chaindb: BaseBeaconChainDB,
cycle_length: int,
is_validating_signatures: bool = True) -> None:
"""
Validate the given ``attestation``.
Raise ``ValidationError`` if it's invalid.
"""
validate_slot(
parent_block,
attestation,
cycle_length,
)
validate_justified(
crystallized_state,
attestation,
chaindb,
)
attestation_indices = get_attestation_indices(
crystallized_state,
attestation,
cycle_length,
)
validate_bitfield(attestation, attestation_indices)
# TODO: implement versioning
validate_version(crystallized_state, attestation)
if is_validating_signatures:
parent_hashes = get_signed_parent_hashes(
recent_block_hashes,
block,
attestation,
cycle_length,
)
validate_aggregate_sig(
crystallized_state,
attestation,
attestation_indices,
parent_hashes,
)
def test_get_attestation_indices(genesis_crystallized_state,
sample_attestation_record_params,
min_committee_size, beacon_config):
attestation = AttestationRecord(**sample_attestation_record_params)
attestation = attestation.copy(
slot=0,
shard_id=0,
)
attestation_indices = get_attestation_indices(
genesis_crystallized_state,
attestation,
beacon_config.cycle_length,
)
assert len(attestation_indices) >= min_committee_size
