"""
Serialize data to/from JSON Lines
"""
import json
from django.core.serializers.base import DeserializationError
from django.core.serializers.json import DjangoJSONEncoder
from django.core.serializers.python import Deserializer as PythonDeserializer
from django.core.serializers.python import Serializer as PythonSerializer
class Serializer(PythonSerializer):
"""Convert a queryset to JSON Lines."""
internal_use_only = False
def _init_options(self):
self._current = None
self.json_kwargs = self.options.copy()
self.json_kwargs.pop("stream", None)
self.json_kwargs.pop("fields", None)
self.json_kwargs.pop("indent", None)
self.json_kwargs["separators"] = (",", ": ")
self.json_kwargs.setdefault("cls", DjangoJSONEncoder)
self.json_kwargs.setdefault("ensure_ascii", False)
def start_serialization(self):
self._init_options()
def end_object(self, obj):
# self._current has the field data
json.dump(self.get_dump_object(obj), self.stream, **self.json_kwargs)
self.stream.write("\n")
self._current = None
def getvalue(self):
# Grandparent super
return super(PythonSerializer, self).getvalue()
def Deserializer(stream_or_string, **options):
"""Deserialize a stream or string of JSON data."""
if isinstance(stream_or_string, bytes):
stream_or_string = stream_or_string.decode()
if isinstance(stream_or_string, (bytes, str)):
stream_or_string = stream_or_string.split("\n")
for line in stream_or_string:
if not line.strip():
continue
try:
yield from PythonDeserializer([json.loads(line)], **options)
except (GeneratorExit, DeserializationError):
raise
except Exception as exc:
raise DeserializationError() from exc