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feat[serializers]: specify default JSON encoders to make subclassing more easily #42

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feat[serializers]: specify default JSON encoders to make subclassing more easily #42

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feat[serializers]: specify default JSON encoders to make subclassing …
spaceone Nov 3, 2021
24ec9ab
feat[serializers]: specify empty __slots__ for serializer classes
spaceone Nov 3, 2021
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9 changes: 6 additions & 3 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -62,19 +62,22 @@ NULL_BYTE: Final = b"\x00"


class JSONSerializer:

encoder = json.JSONEncoder
decoder = json.JSONDecoder

def dumps(self, obj: dict) -> bytes:
try:
return json.dumps(obj).encode() + NULL_BYTE
return json.dumps(obj, cls=self.encoder).encode() + NULL_BYTE
except (ValueError, TypeError):
raise SerializationError(obj)

def loads(self, data: bytes) -> dict:
data = data.split(NULL_BYTE, 1)[0]
try:
return json.loads(data)
return json.loads(data, cls=self.decoder)
except json.JSONDecodeError:
raise DeserializationError(data)

```

Note: A null byte is used to separate the dictionary contents from the bytes that are in memory.
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13 changes: 11 additions & 2 deletions shared_memory_dict/serializers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -24,21 +24,30 @@ def loads(self, data: bytes) -> dict:


class JSONSerializer:

__slots__ = ()

encoder = json.JSONEncoder
decoder = json.JSONDecoder

def dumps(self, obj: dict) -> bytes:
try:
return json.dumps(obj).encode() + NULL_BYTE
return json.dumps(obj, cls=self.encoder).encode() + NULL_BYTE
except (ValueError, TypeError):
raise SerializationError(obj)

def loads(self, data: bytes) -> dict:
data = data.split(NULL_BYTE, 1)[0]
try:
return json.loads(data)
return json.loads(data, cls=self.decoder)
except json.JSONDecodeError:
raise DeserializationError(data)


class PickleSerializer:

__slots__ = ()

def dumps(self, obj: dict) -> bytes:
try:
return pickle.dumps(obj, pickle.HIGHEST_PROTOCOL)
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