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from dataclasses import dataclass
from datetime import datetime
from typing import Dict, List
import msgpack
from mashumaro import DataClassDictMixin
from mashumaro.config import ADD_DIALECT_SUPPORT, BaseConfig
from mashumaro.dialect import Dialect
from mashumaro.mixins.msgpack import DataClassMessagePackMixin
class MyDialect(Dialect):
serialization_strategy = {
bytes: {
"serialize": lambda x: x.decode(),
"deserialize": lambda x: x.encode(),
}
}
@dataclass
class InnerDataClass(DataClassDictMixin):
x: bytes
@dataclass
class DataClass(DataClassMessagePackMixin):
x: bytes
inner: InnerDataClass
def test_data_class_msgpack_mixin():
assert DataClassMessagePackMixin.from_msgpack(b"") is None
assert DataClassMessagePackMixin().to_msgpack() is None
def test_to_msgpack():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: List[int]
dumped = msgpack.packb({"x": [1, 2, 3]})
assert DataClass([1, 2, 3]).to_msgpack() == dumped
def test_from_msgpack():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: List[int]
dumped = msgpack.packb({"x": [1, 2, 3]})
assert DataClass.from_msgpack(dumped) == DataClass([1, 2, 3])
def test_to_msg_pack_datetime():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: datetime
dt = datetime(2018, 10, 29, 12, 46, 55, 308495)
dumped = msgpack.packb({"x": dt.isoformat()})
assert DataClass(dt).to_msgpack() == dumped
def test_msgpack_with_bytes():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: bytes
y: bytearray
instance = DataClass(b"123", bytearray(b"456"))
dumped = msgpack.packb({"x": b"123", "y": bytearray(b"456")})
assert DataClass.from_msgpack(dumped) == instance
assert instance.to_msgpack() == dumped
def test_msgpack_with_serialization_strategy():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: bytes
class Config(BaseConfig):
serialization_strategy = {
bytes: {
"serialize": lambda x: x.decode(),
"deserialize": lambda x: x.encode(),
}
}
instance = DataClass(b"123")
dumped = msgpack.packb({"x": "123"})
assert DataClass.from_dict({"x": "123"}) == instance
assert DataClass.from_msgpack(dumped) == instance
assert instance.to_dict() == {"x": "123"}
assert instance.to_msgpack() == dumped
def test_msgpack_with_dialect():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: bytes
class Config(BaseConfig):
dialect = MyDialect
instance = DataClass(b"123")
dumped_dialect = msgpack.packb({"x": "123"})
assert DataClass.from_dict({"x": "123"}) == instance
assert DataClass.from_msgpack(dumped_dialect) == instance
assert instance.to_dict() == {"x": "123"}
assert instance.to_msgpack() == dumped_dialect
def test_msgpack_with_dialect_support():
@dataclass
class DataClass(DataClassMessagePackMixin):
x: bytes
class Config(BaseConfig):
code_generation_options = [ADD_DIALECT_SUPPORT]
instance = DataClass(b"123")
dumped = msgpack.packb({"x": b"123"})
dumped_dialect = msgpack.packb({"x": "123"})
assert DataClass.from_dict({"x": "MTIz\n"}) == instance
assert DataClass.from_dict({"x": "123"}, dialect=MyDialect) == instance
assert DataClass.from_msgpack(dumped) == instance
assert (
DataClass.from_msgpack(dumped_dialect, dialect=MyDialect) == instance
)
assert instance.to_dict() == {"x": "MTIz\n"}
assert instance.to_dict(dialect=MyDialect) == {"x": "123"}
assert instance.to_msgpack() == dumped
assert instance.to_msgpack(dialect=MyDialect) == dumped_dialect
def test_msgpack_with_custom_encoder_and_decoder():
def decoder(data) -> Dict[str, bytes]:
def to_lower(d):
result = {}
for k, v in d.items():
if isinstance(v, dict):
result[k] = to_lower(v)
else:
result[k] = v.lower()
return result
return to_lower(msgpack.loads(data))
def encoder(data: Dict[str, bytes]) -> bytes:
def to_upper(d):
result = {}
for k, v in d.items():
if isinstance(v, dict):
result[k] = to_upper(v)
else:
result[k] = v.upper()
return result
return msgpack.dumps(to_upper(data))
instance = DataClass(b"abc", InnerDataClass(b"def"))
dumped = msgpack.packb({"x": b"ABC", "inner": {"x": b"DEF"}})
assert instance.to_msgpack(encoder=encoder) == dumped
assert DataClass.from_msgpack(dumped, decoder=decoder) == instance
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