def create_mock_signed_attestations_at_slot(
state: BeaconState,
config: Eth2Config,
state_machine: BaseBeaconStateMachine,
attestation_slot: Slot,
beacon_block_root: Root,
keymap: Dict[BLSPubkey, int],
voted_attesters_ratio: float = 1.0,
) -> Iterable[Attestation]:
"""
Create the mocking attestations of the given ``attestation_slot`` slot with ``keymap``.
"""
if voted_attesters_ratio == 0:
return ()
committees_per_slot = get_committee_count_at_slot(
state,
attestation_slot,
config.MAX_COMMITTEES_PER_SLOT,
config.SLOTS_PER_EPOCH,
config.TARGET_COMMITTEE_SIZE,
)
# Get `target_root`
target_root = _get_target_root(state, config, beacon_block_root)
target_epoch = compute_epoch_at_slot(state.slot, config.SLOTS_PER_EPOCH)
for committee, committee_index, _ in iterate_committees_at_slot(
state, attestation_slot, committees_per_slot, config):
attestation_data = AttestationData.create(
slot=attestation_slot,
index=CommitteeIndex(committee_index),
beacon_block_root=beacon_block_root,
source=Checkpoint.create(
epoch=state.current_justified_checkpoint.epoch,
root=state.current_justified_checkpoint.root,
),
target=Checkpoint.create(root=target_root, epoch=target_epoch),
)
num_voted_attesters = max(int(len(committee) * voted_attesters_ratio),
1)
yield _create_mock_signed_attestation(
state,
attestation_data,
attestation_slot,
committee,
num_voted_attesters,
keymap,
config.SLOTS_PER_EPOCH,
)
def _get_committees(state, target_slot, config, sampling_fraction):
committees_per_slot = get_committee_count_at_slot(
state,
target_slot,
config.MAX_COMMITTEES_PER_SLOT,
config.SLOTS_PER_EPOCH,
config.TARGET_COMMITTEE_SIZE,
)
committees_at_slot = ()
for committee, _, _ in iterate_committees_at_slot(state, target_slot,
committees_per_slot,
config):
committees_at_slot += (committee, )
return tuple(
random.sample(committees_at_slot,
int((sampling_fraction * committees_per_slot))))
