1
|
|
|
from datetime import datetime, timezone |
2
|
|
|
from inspect import isfunction |
3
|
|
|
from typing import Optional, Callable, Union, MutableSequence, Tuple, Dict |
4
|
|
|
|
5
|
|
|
from typish import get_type |
6
|
|
|
|
7
|
|
|
from jsons._cache import cached |
8
|
|
|
from jsons._common_impl import get_class_name, META_ATTR, StateHolder |
9
|
|
|
from jsons._compatibility_impl import get_type_hints |
10
|
|
|
from jsons._datetime_impl import to_str |
11
|
|
|
from jsons._dump_impl import dump |
12
|
|
|
from jsons.classes import JsonSerializable |
13
|
|
|
from jsons.classes.verbosity import Verbosity |
14
|
|
|
from jsons.exceptions import SerializationError, RecursionDetectedError |
15
|
|
|
|
16
|
|
|
|
17
|
|
|
def default_object_serializer( |
18
|
|
|
obj: object, |
19
|
|
|
cls: Optional[type] = None, |
20
|
|
|
*, |
21
|
|
|
key_transformer: Optional[Callable[[str], str]] = None, |
22
|
|
|
strip_nulls: bool = False, |
23
|
|
|
strip_privates: bool = False, |
24
|
|
|
strip_properties: bool = False, |
25
|
|
|
strip_class_variables: bool = False, |
26
|
|
|
strip_attr: Union[str, MutableSequence[str], Tuple[str]] = None, |
27
|
|
|
verbose: Union[Verbosity, bool] = False, |
28
|
|
|
strict: bool = False, |
29
|
|
|
fork_inst: Optional[type] = StateHolder, |
30
|
|
|
**kwargs) -> Optional[dict]: |
31
|
|
|
""" |
32
|
|
|
Serialize the given ``obj`` to a dict. All values within ``obj`` are also |
33
|
|
|
serialized. If ``key_transformer`` is given, it will be used to transform |
34
|
|
|
the casing (e.g. snake_case) to a different format (e.g. camelCase). |
35
|
|
|
:param obj: the object that is to be serialized. |
36
|
|
|
:param cls: the type of the object that is to be dumped. |
37
|
|
|
:param key_transformer: a function that will be applied to all keys in the |
38
|
|
|
resulting dict. |
39
|
|
|
:param strip_nulls: if ``True`` the resulting dict will not contain null |
40
|
|
|
values. |
41
|
|
|
:param strip_privates: if ``True`` the resulting dict will not contain |
42
|
|
|
private attributes (i.e. attributes that start with an underscore). |
43
|
|
|
:param strip_properties: if ``True`` the resulting dict will not contain |
44
|
|
|
values from @properties. |
45
|
|
|
:param strip_class_variables: if ``True`` the resulting dict will not |
46
|
|
|
contain values from class variables. |
47
|
|
|
:param strip_attr: can be a name or a collection of names of attributes |
48
|
|
|
that are not to be included in the dump. |
49
|
|
|
dict will not contain attributes with |
50
|
|
|
:param verbose: if ``True`` the resulting dict will contain meta |
51
|
|
|
information (e.g. on how to deserialize). |
52
|
|
|
:param strict: a bool to determine if the serializer should be strict |
53
|
|
|
(i.e. only dumping stuff that is known to ``cls``). |
54
|
|
|
:param fork_inst: if given, it uses this fork of ``JsonSerializable``. |
55
|
|
|
:param kwargs: any keyword arguments that are to be passed to the |
56
|
|
|
serializer functions. |
57
|
|
|
:return: a Python dict holding the values of ``obj``. |
58
|
|
|
""" |
59
|
|
|
if obj is None: |
60
|
|
|
return obj |
61
|
|
|
strip_attr = _normalize_strip_attr(strip_attr) |
62
|
|
|
if cls: |
63
|
|
|
attributes = _get_attributes_from_class( |
64
|
|
|
cls, strip_privates, strip_properties, strip_class_variables, |
65
|
|
|
strip_attr, strict) |
66
|
|
|
else: |
67
|
|
|
attributes = _get_attributes_from_object( |
68
|
|
|
obj, strip_privates, strip_properties, strip_class_variables, |
69
|
|
|
strip_attr, strict) |
70
|
|
|
cls = obj.__class__ |
71
|
|
|
verbose = Verbosity.from_value(verbose) |
72
|
|
|
kwargs_ = { |
73
|
|
|
**kwargs, |
74
|
|
|
'fork_inst': fork_inst, |
75
|
|
|
'verbose': verbose, |
76
|
|
|
'strict': strict, |
77
|
|
|
# Set a flag in kwargs to temporarily store -cls: |
78
|
|
|
'_store_cls': Verbosity.WITH_CLASS_INFO in verbose |
79
|
|
|
} |
80
|
|
|
|
81
|
|
|
result = _do_serialize(obj=obj, |
82
|
|
|
cls=cls, |
83
|
|
|
attributes=attributes, |
84
|
|
|
kwargs=kwargs_, |
85
|
|
|
key_transformer=key_transformer, |
86
|
|
|
strip_nulls=strip_nulls, |
87
|
|
|
strip_privates=strip_privates, |
88
|
|
|
strip_properties=strip_properties, |
89
|
|
|
strip_class_variables=strip_class_variables, |
90
|
|
|
strip_attr=strip_attr, |
91
|
|
|
strict=strict, |
92
|
|
|
fork_inst=fork_inst) |
93
|
|
|
|
94
|
|
|
cls_name = get_class_name(cls, fully_qualified=True, fork_inst=fork_inst) |
95
|
|
|
if not kwargs.get('_store_cls'): |
96
|
|
|
result = _get_dict_with_meta(result, cls_name, verbose, fork_inst) |
97
|
|
|
return result |
98
|
|
|
|
99
|
|
|
|
100
|
|
|
def _do_serialize( |
101
|
|
|
obj: object, |
102
|
|
|
cls: type, |
103
|
|
|
attributes: Dict[str, Optional[type]], |
104
|
|
|
kwargs: dict, |
105
|
|
|
key_transformer: Optional[Callable[[str], str]] = None, |
106
|
|
|
strip_nulls: bool = False, |
107
|
|
|
strip_privates: bool = False, |
108
|
|
|
strip_properties: bool = False, |
109
|
|
|
strip_class_variables: bool = False, |
110
|
|
|
strip_attr: Union[str, MutableSequence[str], Tuple[str]] = None, |
111
|
|
|
strict: bool = False, |
112
|
|
|
fork_inst: Optional[type] = StateHolder) -> Dict[str, object]: |
113
|
|
|
result = dict() |
114
|
|
|
for attr_name, cls_ in attributes.items(): |
115
|
|
|
attr = obj.__getattribute__(attr_name) |
116
|
|
|
dumped_elem = None |
117
|
|
|
try: |
118
|
|
|
dumped_elem = dump(attr, |
119
|
|
|
cls=cls_, |
120
|
|
|
key_transformer=key_transformer, |
121
|
|
|
strip_nulls=strip_nulls, |
122
|
|
|
strip_privates=strip_privates, |
123
|
|
|
strip_properties=strip_properties, |
124
|
|
|
strip_class_variables=strip_class_variables, |
125
|
|
|
strip_attr=strip_attr, |
126
|
|
|
**kwargs) |
127
|
|
|
|
128
|
|
|
_store_cls_info(dumped_elem, attr, kwargs) |
129
|
|
|
except RecursionDetectedError: |
130
|
|
|
fork_inst._warn('Recursive structure detected in attribute "{}" ' |
131
|
|
|
'of object of type "{}", ignoring the attribute.' |
132
|
|
|
.format(attr_name, get_class_name(cls))) |
133
|
|
|
except SerializationError as err: |
134
|
|
|
if strict: |
135
|
|
|
raise |
136
|
|
|
else: |
137
|
|
|
fork_inst._warn('Failed to dump attribute "{}" of object of ' |
138
|
|
|
'type "{}". Reason: {}. Ignoring the ' |
139
|
|
|
'attribute.' |
140
|
|
|
.format(attr, get_class_name(cls), err.message)) |
141
|
|
|
break |
142
|
|
|
if not (strip_nulls and dumped_elem is None): |
143
|
|
|
if key_transformer: |
144
|
|
|
attr_name = key_transformer(attr_name) |
145
|
|
|
result[attr_name] = dumped_elem |
146
|
|
|
return result |
147
|
|
|
|
148
|
|
|
|
149
|
|
|
def _normalize_strip_attr(strip_attr) -> tuple: |
150
|
|
|
# Make sure that strip_attr is always a tuple. |
151
|
|
|
strip_attr = strip_attr or tuple() |
152
|
|
|
if (not isinstance(strip_attr, MutableSequence) |
153
|
|
|
and not isinstance(strip_attr, tuple)): |
154
|
|
|
strip_attr = (strip_attr,) |
155
|
|
|
return strip_attr |
156
|
|
|
|
157
|
|
|
|
158
|
|
|
@cached |
159
|
|
|
def _get_attributes_from_class( |
160
|
|
|
cls: type, |
161
|
|
|
strip_privates: bool, |
162
|
|
|
strip_properties: bool, |
163
|
|
|
strip_class_variables: bool, |
164
|
|
|
strip_attr: tuple, |
165
|
|
|
strict: bool) -> Dict[str, Optional[type]]: |
166
|
|
|
# Get the attributes that are known in the class. |
167
|
|
|
attributes_and_types = _get_attributes_and_types(cls, strict) |
168
|
|
|
return _filter_attributes(cls, attributes_and_types, strip_privates, |
169
|
|
|
strip_properties, strip_class_variables, |
170
|
|
|
strip_attr) |
171
|
|
|
|
172
|
|
|
|
173
|
|
|
def _get_attributes_from_object( |
174
|
|
|
obj: object, |
175
|
|
|
strip_privates: bool, |
176
|
|
|
strip_properties: bool, |
177
|
|
|
strip_class_variables: bool, |
178
|
|
|
strip_attr: tuple, |
179
|
|
|
strict: bool) -> Dict[str, Optional[type]]: |
180
|
|
|
# Get the attributes that are known in the object. |
181
|
|
|
cls = obj.__class__ |
182
|
|
|
attributes_and_types = _get_attributes_and_types(cls, strict) |
183
|
|
|
attributes = {attr: attributes_and_types.get(attr, None) |
184
|
|
|
for attr in dir(obj)} |
185
|
|
|
return _filter_attributes(cls, attributes, strip_privates, |
186
|
|
|
strip_properties, strip_class_variables, |
187
|
|
|
strip_attr) |
188
|
|
|
|
189
|
|
|
|
190
|
|
|
@cached |
191
|
|
|
def _get_attributes_and_types(cls: type, |
192
|
|
|
strict: bool) -> Dict[str, Optional[type]]: |
193
|
|
|
if '__slots__' in cls.__dict__: |
194
|
|
|
attributes = {attr: None for attr in cls.__slots__} |
195
|
|
|
elif hasattr(cls, '__annotations__'): |
196
|
|
|
attributes = cls.__annotations__ |
197
|
|
|
elif strict: |
198
|
|
|
hints = get_type_hints(cls.__init__) |
199
|
|
|
attributes = {k: hints[k] for k in hints if k != 'self'} |
200
|
|
|
else: |
201
|
|
|
attributes = {} |
202
|
|
|
|
203
|
|
|
# Add properties and class variables. |
204
|
|
|
props, class_vars = _get_class_props(cls) |
205
|
|
|
for elem in props + class_vars: |
206
|
|
|
attributes[elem] = None |
207
|
|
|
|
208
|
|
|
return attributes |
209
|
|
|
|
210
|
|
|
|
211
|
|
|
def _filter_attributes( |
212
|
|
|
cls: type, |
213
|
|
|
attributes: Dict[str, Optional[type]], |
214
|
|
|
strip_privates: bool, |
215
|
|
|
strip_properties: bool, |
216
|
|
|
strip_class_variables: bool, |
217
|
|
|
strip_attr: tuple) -> Dict[str, Optional[type]]: |
218
|
|
|
# Filter the given attributes with the given preferences. |
219
|
|
|
strip_attr = strip_attr + _ABC_ATTRS |
220
|
|
|
excluded_elems = dir(JsonSerializable) |
221
|
|
|
props, other_cls_vars = _get_class_props(cls) |
222
|
|
|
|
223
|
|
|
return {attr: type_ for attr, type_ in attributes.items() |
224
|
|
|
if not attr.startswith('__') |
225
|
|
|
and not (strip_privates and attr.startswith('_')) |
226
|
|
|
and not (strip_properties and attr in props) |
227
|
|
|
and not (strip_class_variables and attr in other_cls_vars) |
228
|
|
|
and attr not in strip_attr |
229
|
|
|
and attr != 'json' |
230
|
|
|
and not isfunction(getattr(cls, attr, None)) |
231
|
|
|
and attr not in excluded_elems} |
232
|
|
|
|
233
|
|
|
|
234
|
|
|
def _get_class_props(cls: type) -> Tuple[list, list]: |
235
|
|
|
props = [] |
236
|
|
|
other_cls_vars = [] |
237
|
|
|
for n, v in _get_complete_class_dict(cls).items(): |
238
|
|
|
list_to_append = props if isinstance(v, property) else other_cls_vars |
239
|
|
|
list_to_append.append(n) |
240
|
|
|
return props, other_cls_vars |
241
|
|
|
|
242
|
|
|
|
243
|
|
|
def _get_complete_class_dict(cls: type) -> dict: |
244
|
|
|
cls_dict = {} |
245
|
|
|
# Loop reversed so values of sub-classes override those of super-classes. |
246
|
|
|
for cls_or_elder in reversed(cls.mro()): |
247
|
|
|
cls_dict.update(cls_or_elder.__dict__) |
248
|
|
|
return cls_dict |
249
|
|
|
|
250
|
|
|
|
251
|
|
|
def _get_dict_with_meta( |
252
|
|
|
obj: dict, |
253
|
|
|
cls_name: str, |
254
|
|
|
verbose: Verbosity, |
255
|
|
|
fork_inst: type) -> dict: |
256
|
|
|
# This function will add a -meta section to the given obj (provided that |
257
|
|
|
# the given obj has -cls attributes for all children). |
258
|
|
|
if verbose is Verbosity.WITH_NOTHING: |
259
|
|
|
return obj |
260
|
|
|
|
261
|
|
|
obj[META_ATTR] = {} |
262
|
|
|
if Verbosity.WITH_CLASS_INFO in verbose: |
263
|
|
|
collection_of_types = {} |
264
|
|
|
_fill_collection_of_types(obj, cls_name, '/', collection_of_types) |
265
|
|
|
collection_of_types['/'] = cls_name |
266
|
|
|
obj[META_ATTR]['classes'] = collection_of_types |
267
|
|
|
if Verbosity.WITH_DUMP_TIME in verbose: |
268
|
|
|
dump_time = to_str(datetime.now(tz=timezone.utc), True, fork_inst) |
269
|
|
|
obj[META_ATTR]['dump_time'] = dump_time |
270
|
|
|
return obj |
271
|
|
|
|
272
|
|
|
|
273
|
|
|
def _fill_collection_of_types( |
274
|
|
|
obj_: dict, |
275
|
|
|
cls_name_: Optional[str], |
276
|
|
|
prefix: str, |
277
|
|
|
collection_of_types_: dict) -> str: |
278
|
|
|
# This function loops through obj_ to fill collection_of_types_ with the |
279
|
|
|
# class names. All of the -cls attributes are removed in the process. |
280
|
|
|
cls_name_ = _get_class_name_and_strip_cls(cls_name_, obj_) |
281
|
|
|
for attr in obj_: |
282
|
|
|
if attr != META_ATTR and isinstance(obj_[attr], dict): |
283
|
|
|
attr_class = _fill_collection_of_types(obj_[attr], |
284
|
|
|
None, |
285
|
|
|
prefix + attr + '/', |
286
|
|
|
collection_of_types_) |
287
|
|
|
collection_of_types_[prefix + attr] = attr_class |
288
|
|
|
return cls_name_ |
289
|
|
|
|
290
|
|
|
|
291
|
|
|
def _get_class_name_and_strip_cls(cls_name: Optional[str], obj: dict) -> str: |
292
|
|
|
result = cls_name |
293
|
|
|
if not cls_name and '-cls' in obj: |
294
|
|
|
result = obj['-cls'] |
295
|
|
|
if '-cls' in obj: |
296
|
|
|
del obj['-cls'] |
297
|
|
|
return result |
298
|
|
|
|
299
|
|
|
|
300
|
|
|
def _store_cls_info(result: object, original_obj: dict, kwargs): |
301
|
|
|
if kwargs.get('_store_cls', None) and isinstance(result, dict): |
302
|
|
|
cls = get_type(original_obj) |
303
|
|
|
if cls.__module__ == 'typing': |
304
|
|
|
cls_name = repr(cls) |
305
|
|
|
else: |
306
|
|
|
cls_name = get_class_name(cls, fully_qualified=True, |
307
|
|
|
fork_inst=kwargs['fork_inst']) |
308
|
|
|
result['-cls'] = cls_name |
309
|
|
|
|
310
|
|
|
|
311
|
|
|
_ABC_ATTRS = ('_abc_registry', '_abc_cache', '_abc_negative_cache', |
312
|
|
|
'_abc_negative_cache_version', '_abc_impl') |
313
|
|
|
|