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import types
from hashlib import sha1
from itertools import chain
from typing import Any, Union, Iterable
from datetime import date, datetime
from banal.dicts import is_mapping
from banal.lists import is_sequence
def _bytes_str(obj: Union[str, bytes]) -> bytes:
if not isinstance(obj, str):
return obj
return obj.encode("utf-8")
def bytes_iter(obj: Any) -> Iterable[bytes]:
"""Turn a complex object into an iterator of byte strings.
The resulting iterator can be used for caching.
"""
if obj is None:
return
elif isinstance(obj, (bytes, str)):
yield _bytes_str(obj)
elif isinstance(obj, (date, datetime)):
yield _bytes_str(obj.isoformat())
elif is_mapping(obj):
if None in obj:
yield from bytes_iter(obj.pop(None))
for key in sorted(obj.keys()):
for out in chain(bytes_iter(key), bytes_iter(obj[key])):
yield out
elif is_sequence(obj):
if isinstance(obj, (list, set)):
try:
obj = sorted(obj)
except Exception:
pass
for item in obj:
for out in bytes_iter(item):
yield out
elif isinstance(
obj,
(
types.FunctionType,
types.BuiltinFunctionType,
types.MethodType,
types.BuiltinMethodType,
),
):
yield _bytes_str(getattr(obj, "func_name", ""))
else:
yield _bytes_str(str(obj))
def hash_data(obj: Any) -> str:
"""Generate a SHA1 from a complex object."""
collect = sha1()
for data in bytes_iter(obj):
collect.update(data)
return collect.hexdigest()
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