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import json
from base64 import b64encode, b64decode
from bitarray import bitarray
from bitarray.util import serialize, deserialize
class JSONEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj, bitarray):
if len(obj) > 50:
return {'bitarray_b64': b64encode(serialize(obj)).decode()}
else:
return {'bitarray': obj.to01()}
return json.JSONEncoder.default(self, obj)
class JSONDecoder(json.JSONDecoder):
def __init__(self, *args, **kwargs):
json.JSONDecoder.__init__(self, object_hook=self.object_hook,
*args, **kwargs)
def object_hook(self, obj):
if isinstance(obj, dict) and len(obj) == 1:
if 'bitarray_b64' in obj:
return deserialize(b64decode(obj['bitarray_b64']))
if 'bitarray' in obj:
return bitarray(obj['bitarray'])
return obj
def test():
from random import getrandbits
from bitarray.util import urandom
a = [urandom(n * n, endian=['little', 'big'][getrandbits(1)])
for n in range(12)]
a.append({'key1': bitarray('010'),
'key2': 'value2',
'key3': urandom(300)})
j = JSONEncoder(indent=2).encode(a)
print(j)
b = JSONDecoder().decode(j)
assert a == b
assert b[-1]['key1'] == bitarray('010')
if __name__ == '__main__':
test()
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