def _get_deletable_state_roots(db: BaseDB) -> Tuple[Hash32]:
"""
Return deletable_state_roots.
"""
lookup_key = SchemaV1.make_deletable_state_roots_lookup_key()
if not db.exists(lookup_key):
db.set(
lookup_key,
rlp.encode((), sedes=CountableList(hash32)),
)
deletable_state_roots = rlp.decode(db[lookup_key],
sedes=CountableList(hash32))
return deletable_state_roots
def _add_slot_to_crystallized_state_lookup(
cls, db: BaseDB, crystallized_state: CrystallizedState) -> None:
"""
Set a record in the database to allow looking up this block by its
last state recalculation slot.
If it's a fork, store the old state root in `deletable_state_roots`.
"""
slot_to_hash_key = SchemaV1.make_slot_to_crystallized_state_lookup_key(
crystallized_state.last_state_recalc)
if db.exists(slot_to_hash_key):
deletable_state_roots = cls._get_deletable_state_roots(db)
replaced_state_root = rlp.decode(db[slot_to_hash_key],
sedes=rlp.sedes.binary)
cls._set_deletatable_state(
db,
deletable_state_roots + (replaced_state_root, ),
)
db.set(
slot_to_hash_key,
rlp.encode(crystallized_state.hash, sedes=rlp.sedes.binary),
)
