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serializer_utils
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Feature completeness

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GNU LESSER GENERAL PUBLIC LICENSE
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Copyright (C) 2018, Rolf van Kleef
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serializer_utils/deserializer.py
View file @ 6e7391cb
from typing import Optional
from typing import Optional, Union
from typeguard import check_type
......@@ -86,7 +86,7 @@ class Deserializable(metaclass=BaseMeta):
return fields
def deserialize(t, d, try_all=False):
def get_deserialization_class(t, d, try_all=False):
for sc in t.__subclasses__():
if hasattr(sc, '_discriminators'):
for discriminator in sc._discriminators:
......@@ -94,17 +94,42 @@ def deserialize(t, d, try_all=False):
break
else:
try:
return deserialize(sc, d)
return get_deserialization_class(sc, t, try_all)
except TypeError as e:
if not try_all:
raise e
return t
if hasattr(t, '_abstract') and t._abstract:
raise TypeError('Cannot deserialize into {}: is abstract.'.format(t.__name__))
instance = t()
for k, rule in t.get_attrs().items():
v = rule.validate(k, d[k] if k in d else None)
def deserialize(rule: Rule, data, try_all=False, key=None):
# In case of primitive types, attempt to assign.
try:
return rule.validate(key, data)
except TypeError:
pass
if type(rule.type) is type(Union):
for arg in rule.type.__args__:
try:
return deserialize(Rule(arg), data, try_all, key)
except TypeError:
pass
raise TypeError('{} did not match any of {}.'.format(type(data), rule.type.__args__))
if issubclass(rule.type, Deserializable):
if not isinstance(data, dict):
raise TypeError('Cannot deserialize non-dict into class.')
cls = get_deserialization_class(rule.type, data, try_all)
if hasattr(cls, '_abstract') and cls._abstract:
raise TypeError('Cannot deserialize into {}: is abstract.'.format(cls.__name__))
instance = cls()
for k, r in cls.get_attrs().items():
v = deserialize(r, data[k] if k in data else r.default, try_all, key=k)
setattr(instance, k, v)
return instance
raise TypeError('Unable to find a deserialization candidate for {} in {}.'.format(data, rule))
\ No newline at end of file
test.py
View file @ 6e7391cb
from time import sleep
from typing import Optional
from serializer_utils.deserializer import Deserializable
from serializer_utils.deserializer import Deserializable, Rule
from serializer_utils.annotations import abstract, discriminate
......@@ -32,16 +32,34 @@ class RefundLine(ReceiptLine):
return 'RefundLine(super={})'.format(super(RefundLine, self).__repr__())
class Test(Deserializable):
tf: Optional[ReceiptLine]
def __repr__(self):
return 'Test(tf={})'.format(self.tf.__repr__())
if __name__ == '__main__':
import sys
import traceback
from serializer_utils.deserializer import deserialize
def print_result(function, *args, **kwargs):
try:
print(deserialize(ReceiptLine, {'type': 'transaction', 'name': 'asdf', 'article_id': 5, 'amount': 5}))
print(deserialize(ReceiptLine, {'type': 'refund', 'name': 'asdf', 'pk': 5}))
print(deserialize(ReceiptLine, {'type': 'other', 'name': 'asdf'}))
except TypeError as err:
print(function(*args, **kwargs))
except:
sleep(0.05)
print(traceback.format_exc(), file=sys.stderr)
fns = [
[Rule(ReceiptLine), {'type': 'transaction', 'name': 'asdf', 'article_id': 5, 'amount': 5}],
[Rule(ReceiptLine), {'type': 'refund', 'name': 'asdf', 'pk': 5}],
[Rule(ReceiptLine), {'type': 'other', 'name': 'asdf'}],
[Rule(ReceiptLine), {'type': 'transaction'}],
[Rule(ReceiptLine), {'type': 'transaction', 'name': 'asdf', 'pk': 'no'}],
[Rule(Test), {'tf': {'type': 'refund', 'name': 'asdf', 'pk': 5}}]
]
[print_result(deserialize, *entry) for entry in fns]
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