def get_validator_duties(self, public_keys: Collection[BLSPubkey],
epoch: Epoch) -> Iterable[ValidatorDuty]:
if epoch < GENESIS_EPOCH:
return ()
current_tick = self.clock.compute_current_tick()
state = advance_state_to_slot(self.chain, current_tick.slot)
for public_key in public_keys:
validator_index = state.get_validator_index_for_public_key(
public_key)
try:
committee_assignment = get_committee_assignment(
state, self.eth2_config, epoch, validator_index)
except NoCommitteeAssignment:
continue
if is_proposer(state, validator_index, self.eth2_config):
# TODO (ralexstokes) clean this up!
if state.slot != 0:
block_proposal_slot = state.slot
else:
block_proposal_slot = Slot((1 << 64) - 1)
else:
# NOTE: temporary sentinel value for "no slot"
# The API has since been updated w/ much better ergonomics
block_proposal_slot = Slot((1 << 64) - 1)
yield ValidatorDuty(
public_key,
committee_assignment.slot,
committee_assignment.committee_index,
block_proposal_slot,
)
def _get_slot_with_validator_selected(candidate_indices, state, config):
epoch = state.current_epoch(config.SLOTS_PER_EPOCH)
epoch_start_slot = compute_start_slot_at_epoch(epoch, config.SLOTS_PER_EPOCH)
for index in candidate_indices:
try:
for slot in range(epoch_start_slot, epoch_start_slot + config.SLOTS_PER_EPOCH):
state = state.copy(slot=slot)
if is_proposer(state, index, config):
return slot, index
except NoCommitteeAssignment:
continue
raise Exception(
"Check the parameters of the genesis state; the above code should return"
" some proposer if the set of ``candidate_indices`` is big enough."
)