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#!/usr/bin/env python
# coding: utf-8
from pytest import raises
from msgpack import packb, unpackb
def _decode_complex(obj):
if b'__complex__' in obj:
return complex(obj[b'real'], obj[b'imag'])
return obj
def _encode_complex(obj):
if isinstance(obj, complex):
return {b'__complex__': True, b'real': 1, b'imag': 2}
return obj
def test_encode_hook():
packed = packb([3, 1+2j], default=_encode_complex)
unpacked = unpackb(packed, use_list=1)
assert unpacked[1] == {b'__complex__': True, b'real': 1, b'imag': 2}
def test_decode_hook():
packed = packb([3, {b'__complex__': True, b'real': 1, b'imag': 2}])
unpacked = unpackb(packed, object_hook=_decode_complex, use_list=1)
assert unpacked[1] == 1+2j
def test_decode_pairs_hook():
packed = packb([3, {1: 2, 3: 4}])
prod_sum = 1 * 2 + 3 * 4
unpacked = unpackb(packed, object_pairs_hook=lambda l: sum(k * v for k, v in l), use_list=1)
assert unpacked[1] == prod_sum
def test_only_one_obj_hook():
with raises(ValueError):
unpackb(b'', object_hook=lambda x: x, object_pairs_hook=lambda x: x)
def test_bad_hook():
with raises(TypeError):
packed = packb([3, 1+2j], default=lambda o: o)
unpacked = unpackb(packed, use_list=1)
def _arr_to_str(arr):
return ''.join(str(c) for c in arr)
def test_array_hook():
packed = packb([1,2,3])
unpacked = unpackb(packed, list_hook=_arr_to_str, use_list=1)
assert unpacked == '123'
class DecodeError(Exception):
pass
def bad_complex_decoder(o):
raise DecodeError("Ooops!")
def test_an_exception_in_objecthook1():
with raises(DecodeError):
packed = packb({1: {'__complex__': True, 'real': 1, 'imag': 2}})
unpackb(packed, object_hook=bad_complex_decoder)
def test_an_exception_in_objecthook2():
with raises(DecodeError):
packed = packb({1: [{'__complex__': True, 'real': 1, 'imag': 2}]})
unpackb(packed, list_hook=bad_complex_decoder, use_list=1)
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