40 lines
1.4 KiB
Python
40 lines
1.4 KiB
Python
from eth2spec.utils.ssz.ssz_impl import hash_tree_root
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from eth2spec.utils.ssz.ssz_typing import (
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is_uint_type, is_bool_type, is_list_type,
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is_vector_type, is_bytes_type, is_bytesn_type, is_container_type,
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read_vector_elem_type, read_list_elem_type,
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Vector, BytesN
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)
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def decode(data, typ):
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if is_uint_type(typ):
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return data
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elif is_bool_type(typ):
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assert data in (True, False)
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return data
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elif is_list_type(typ):
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elem_typ = read_list_elem_type(typ)
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return [decode(element, elem_typ) for element in data]
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elif is_vector_type(typ):
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elem_typ = read_vector_elem_type(typ)
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return Vector(decode(element, elem_typ) for element in data)
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elif is_bytes_type(typ):
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return bytes.fromhex(data[2:])
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elif is_bytesn_type(typ):
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return BytesN(bytes.fromhex(data[2:]))
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elif is_container_type(typ):
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temp = {}
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for field, subtype in typ.get_fields():
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temp[field] = decode(data[field], subtype)
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if field + "_hash_tree_root" in data:
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assert(data[field + "_hash_tree_root"][2:] ==
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hash_tree_root(temp[field], subtype).hex())
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ret = typ(**temp)
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if "hash_tree_root" in data:
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assert(data["hash_tree_root"][2:] ==
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hash_tree_root(ret, typ).hex())
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return ret
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else:
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raise Exception(f"Type not recognized: data={data}, typ={typ}")
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