def _get_active_state_root_by_crystallized(
db: BaseDB, crystallized_state_root: Hash32) -> Hash32:
state_root_to_hash_key = SchemaV1.make_crystallized_to_active_state_root_lookup_key(
crystallized_state_root)
try:
encoded_key = db[state_root_to_hash_key]
except KeyError:
raise StateRootNotFound(
"No canonical active state for crystallized_state_root #{0}".
format(state_root_to_hash_key))
else:
return rlp.decode(encoded_key, sedes=rlp.sedes.binary)
def _add_crystallized_to_active_state_lookup(
cls, db: BaseDB, active_state: ActiveState,
crystallized_state_root: Hash32) -> None:
"""
Set a record in the database to allow looking up this block by its
last state recalculation slot.
"""
slot_to_hash_key = SchemaV1.make_crystallized_to_active_state_root_lookup_key(
crystallized_state_root, )
db.set(
slot_to_hash_key,
rlp.encode(active_state.hash, sedes=rlp.sedes.binary),
)