68 lines
2.3 KiB
Python
68 lines
2.3 KiB
Python
"""
|
|
YAML serializer.
|
|
|
|
Requires PyYaml (http://pyyaml.org/), but that's checked for in __init__.
|
|
"""
|
|
|
|
import decimal
|
|
import yaml
|
|
from io import StringIO
|
|
|
|
from django.db import models
|
|
from django.core.serializers.base import DeserializationError
|
|
from django.core.serializers.python import Serializer as PythonSerializer
|
|
from django.core.serializers.python import Deserializer as PythonDeserializer
|
|
from django.utils import six
|
|
|
|
|
|
class DjangoSafeDumper(yaml.SafeDumper):
|
|
def represent_decimal(self, data):
|
|
return self.represent_scalar('tag:yaml.org,2002:str', str(data))
|
|
|
|
DjangoSafeDumper.add_representer(decimal.Decimal, DjangoSafeDumper.represent_decimal)
|
|
|
|
class Serializer(PythonSerializer):
|
|
"""
|
|
Convert a queryset to YAML.
|
|
"""
|
|
|
|
internal_use_only = False
|
|
|
|
def handle_field(self, obj, field):
|
|
# A nasty special case: base YAML doesn't support serialization of time
|
|
# types (as opposed to dates or datetimes, which it does support). Since
|
|
# we want to use the "safe" serializer for better interoperability, we
|
|
# need to do something with those pesky times. Converting 'em to strings
|
|
# isn't perfect, but it's better than a "!!python/time" type which would
|
|
# halt deserialization under any other language.
|
|
if isinstance(field, models.TimeField) and getattr(obj, field.name) is not None:
|
|
self._current[field.name] = str(getattr(obj, field.name))
|
|
else:
|
|
super(Serializer, self).handle_field(obj, field)
|
|
|
|
def end_serialization(self):
|
|
yaml.dump(self.objects, self.stream, Dumper=DjangoSafeDumper, **self.options)
|
|
|
|
def getvalue(self):
|
|
# Grand-parent super
|
|
return super(PythonSerializer, self).getvalue()
|
|
|
|
def Deserializer(stream_or_string, **options):
|
|
"""
|
|
Deserialize a stream or string of YAML data.
|
|
"""
|
|
if isinstance(stream_or_string, bytes):
|
|
stream_or_string = stream_or_string.decode('utf-8')
|
|
if isinstance(stream_or_string, six.string_types):
|
|
stream = StringIO(stream_or_string)
|
|
else:
|
|
stream = stream_or_string
|
|
try:
|
|
for obj in PythonDeserializer(yaml.safe_load(stream), **options):
|
|
yield obj
|
|
except GeneratorExit:
|
|
raise
|
|
except Exception as e:
|
|
# Map to deserializer error
|
|
raise DeserializationError(e)
|