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try:
import simplejson as json
except ImportError:
import json
from datetime import date, datetime
from decimal import Decimal
from .exceptions import SerializationError, ImproperlyConfigured
from .compat import string_types
class TextSerializer(object):
mimetype = 'text/plain'
def loads(self, s):
return s
def dumps(self, data):
if isinstance(data, string_types):
return data
raise SerializationError('Cannot serialize %r into text.' % data)
class JSONSerializer(object):
mimetype = 'application/json'
def default(self, data):
if isinstance(data, (date, datetime)):
return data.isoformat()
elif isinstance(data, Decimal):
return float(data)
raise TypeError("Unable to serialize %r (type: %s)" % (data, type(data)))
def loads(self, s):
try:
return json.loads(s)
except (ValueError, TypeError) as e:
raise SerializationError(s, e)
def dumps(self, data):
# don't serialize strings
if isinstance(data, string_types):
return data
try:
return json.dumps(data, default=self.default)
except (ValueError, TypeError) as e:
raise SerializationError(data, e)
DEFAULT_SERIALIZERS = {
JSONSerializer.mimetype: JSONSerializer(),
TextSerializer.mimetype: TextSerializer(),
}
class Deserializer(object):
def __init__(self, serializers, default_mimetype='application/json'):
try:
self.default = serializers[default_mimetype]
except KeyError:
raise ImproperlyConfigured('Cannot find default serializer (%s)' % default_mimetype)
self.serializers = serializers
def loads(self, s, mimetype=None):
if not mimetype:
deserializer = self.default
else:
# split out charset
mimetype = mimetype.split(';', 1)[0]
try:
deserializer = self.serializers[mimetype]
except KeyError:
raise SerializationError('Unknown mimetype, unable to deserialize: %s' % mimetype)
return deserializer.loads(s)
|
