def _add_head_state_slot_lookup(self, slot: Slot) -> None:
"""
Write head state slot into the database.
"""
self.db.set(
SchemaV1.make_head_state_slot_lookup_key(),
ssz.encode(slot, sedes=ssz.sedes.uint64),
)
def _get_head_state_slot(db: DatabaseAPI) -> Slot:
try:
encoded_head_state_slot = db[
SchemaV1.make_head_state_slot_lookup_key()]
head_state_slot = ssz.decode(encoded_head_state_slot,
sedes=ssz.sedes.uint64)
except KeyError:
raise HeadStateSlotNotFound("No head state slot found")
return head_state_slot
