def __class_getitem__(cls, params) -> Type["List"]:
(element_type, limit) = params
contents_depth = 0
packed = False
if isinstance(element_type, BasicView):
elems_per_chunk = 32 // element_type.type_byte_length()
contents_depth = get_depth(
(limit + elems_per_chunk - 1) // elems_per_chunk)
packed = True
else:
contents_depth = get_depth(limit)
class SpecialListView(List):
@classmethod
def is_packed(cls) -> bool:
return packed
@classmethod
def contents_depth(cls) -> int:
return contents_depth
@classmethod
def element_cls(cls) -> Type[View]:
return element_type
@classmethod
def limit(cls) -> int:
return limit
SpecialListView.__name__ = SpecialListView.type_repr()
return SpecialListView
def __class_getitem__(cls, params) -> Type["Vector"]:
(element_view_cls, length) = params
if length <= 0:
raise Exception(f"Invalid vector length: {length}")
tree_depth = 0
packed = False
if isinstance(element_view_cls, BasicView):
elems_per_chunk = 32 // element_view_cls.type_byte_length()
tree_depth = get_depth(
(length + elems_per_chunk - 1) // elems_per_chunk)
packed = True
else:
tree_depth = get_depth(length)
class SpecialVectorView(Vector):
@classmethod
def is_packed(cls) -> bool:
return packed
@classmethod
def tree_depth(cls) -> int:
return tree_depth
@classmethod
def element_cls(cls) -> Type[View]:
return element_view_cls
@classmethod
def vector_length(cls) -> int:
return length
out_typ = SpecialVectorView
# for fixed-size vectors, pre-compute the size.
if element_view_cls.is_fixed_byte_length():
byte_length = element_view_cls.type_byte_length() * length
class FixedSpecialVectorView(SpecialVectorView):
@classmethod
def type_byte_length(cls) -> int:
return byte_length
@classmethod
def min_byte_length(cls) -> int:
return byte_length
@classmethod
def max_byte_length(cls) -> int:
return byte_length
out_typ = FixedSpecialVectorView
out_typ.__name__ = out_typ.type_repr()
return out_typ
def get_valid_custody_response(spec,
state,
bit_challenge,
custody_data,
challenge_index,
invalid_chunk_bit=False):
chunks = custody_chunkify(spec, custody_data)
chunk_index = len(chunks) - 1
chunk_bit = spec.get_custody_chunk_bit(bit_challenge.responder_key,
chunks[chunk_index])
while chunk_bit == bit_challenge.chunk_bits[
chunk_index] ^ invalid_chunk_bit:
chunk_index -= 1
chunk_bit = spec.get_custody_chunk_bit(bit_challenge.responder_key,
chunks[chunk_index])
chunks_hash_tree_roots = [
hash_tree_root(ByteVector[spec.BYTES_PER_CUSTODY_CHUNK](chunk))
for chunk in chunks
]
chunks_hash_tree_roots += [
hash_tree_root(ByteVector[spec.BYTES_PER_CUSTODY_CHUNK](
b"\0" * spec.BYTES_PER_CUSTODY_CHUNK))
for i in range(2**spec.ceillog2(len(chunks)) - len(chunks))
]
data_tree = get_merkle_tree(chunks_hash_tree_roots)
data_branch = get_merkle_proof(data_tree, chunk_index)
bitlist_chunk_index = chunk_index // BYTES_PER_CHUNK
print(bitlist_chunk_index)
bitlist_chunk_nodes = pack_bits_to_chunks(bit_challenge.chunk_bits)
bitlist_tree = subtree_fill_to_contents(bitlist_chunk_nodes,
get_depth(spec.MAX_CUSTODY_CHUNKS))
print(bitlist_tree)
bitlist_chunk_branch = None # TODO; extract proof from merkle tree
bitlist_chunk_index = chunk_index // 256
chunk_bits_leaf = Bitvector[256](
bit_challenge.chunk_bits[bitlist_chunk_index *
256:(bitlist_chunk_index + 1) * 256])
return spec.CustodyResponse(
challenge_index=challenge_index,
chunk_index=chunk_index,
chunk=ByteVector[spec.BYTES_PER_CUSTODY_CHUNK](chunks[chunk_index]),
data_branch=data_branch,
chunk_bits_branch=bitlist_chunk_branch,
chunk_bits_leaf=chunk_bits_leaf,
)
def __class_getitem__(cls, limit) -> Type["ByteList"]:
chunk_count = (limit + 31) // 32
contents_depth = get_depth(chunk_count)
class SpecialByteListView(ByteList):
@classmethod
def contents_depth(cls) -> int:
return contents_depth
@classmethod
def limit(cls) -> int:
return limit
return SpecialByteListView
def __class_getitem__(cls, length) -> Type["ByteVector"]:
chunk_count = (length + 31) // 32
tree_depth = get_depth(chunk_count)
class SpecialByteVectorView(ByteVector):
@classmethod
def default_node(cls) -> Node:
return subtree_fill_to_length(zero_node(0), tree_depth, chunk_count)
@classmethod
def tree_depth(cls) -> int:
return tree_depth
@classmethod
def type_byte_length(cls) -> int:
return length
return SpecialByteVectorView
def tree_depth(cls) -> int:
return get_depth(len(cls.fields()))
def test_tree_depth(count: int, depth: int):
assert get_depth(count) == depth
def tree_depth(cls) -> int:
return get_depth((cls.vector_length() + 255) // 256)
def contents_depth(cls) -> int: # depth excluding the length mix-in
return get_depth((cls.limit() + 255) // 256)