Nick Lang
87 lines
2.4 KiB
Python
87 lines
2.4 KiB
Python
try:
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import simplejson as json
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except ImportError:
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import json
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import uuid
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from datetime import date, datetime
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from decimal import Decimal
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from .exceptions import SerializationError, ImproperlyConfigured
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from .compat import string_types
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class TextSerializer(object):
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mimetype = "text/plain"
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def loads(self, s):
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return s
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def dumps(self, data):
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if isinstance(data, string_types):
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return data
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raise SerializationError("Cannot serialize %r into text." % data)
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class JSONSerializer(object):
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mimetype = "application/json"
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def default(self, data):
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if isinstance(data, (date, datetime)):
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return data.isoformat()
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elif isinstance(data, Decimal):
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return float(data)
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elif isinstance(data, uuid.UUID):
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return str(data)
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raise TypeError("Unable to serialize %r (type: %s)" % (data, type(data)))
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def loads(self, s):
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try:
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return json.loads(s)
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except (ValueError, TypeError) as e:
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raise SerializationError(s, e)
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def dumps(self, data):
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# don't serialize strings
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if isinstance(data, string_types):
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return data
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try:
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return json.dumps(
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data, default=self.default, ensure_ascii=False, separators=(",", ":")
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)
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except (ValueError, TypeError) as e:
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raise SerializationError(data, e)
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DEFAULT_SERIALIZERS = {
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JSONSerializer.mimetype: JSONSerializer(),
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TextSerializer.mimetype: TextSerializer(),
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}
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class Deserializer(object):
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def __init__(self, serializers, default_mimetype="application/json"):
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try:
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self.default = serializers[default_mimetype]
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except KeyError:
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raise ImproperlyConfigured(
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"Cannot find default serializer (%s)" % default_mimetype
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)
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self.serializers = serializers
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def loads(self, s, mimetype=None):
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if not mimetype:
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deserializer = self.default
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else:
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# split out charset
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mimetype, _, _ = mimetype.partition(";")
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try:
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deserializer = self.serializers[mimetype]
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except KeyError:
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raise SerializationError(
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"Unknown mimetype, unable to deserialize: %s" % mimetype
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)
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return deserializer.loads(s)
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