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from multiprocessing import Process |
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from typing import Type |
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from typish import get_args |
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from jsons._common_impl import StateHolder |
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from jsons._load_impl import load |
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from jsons._multitasking import multi_task |
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from jsons.exceptions import JsonsError, DeserializationError |
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def default_list_deserializer( |
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obj: list, |
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cls: type = None, |
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*, |
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warn_on_fail: bool = False, |
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tasks: int = 1, |
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task_type: type = Process, |
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fork_inst: Type[StateHolder] = StateHolder, |
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**kwargs) -> list: |
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""" |
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Deserialize a list by deserializing all items of that list. |
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:param obj: the list that needs deserializing. |
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:param cls: the type optionally with a generic (e.g. List[str]). |
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:param warn_on_fail: if ``True``, will warn upon any failure and continue. |
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:param tasks: the allowed number of tasks (threads or processes). |
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:param task_type: the type that is used for multitasking. |
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:param fork_inst: if given, it uses this fork of ``JsonSerializable``. |
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:param kwargs: any keyword arguments. |
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:return: a deserialized list instance. |
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""" |
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cls_ = None |
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kwargs_ = {**kwargs} |
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cls_args = get_args(cls) |
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if cls_args: |
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cls_ = cls_args[0] |
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# Mark the cls as 'inferred' so that later it is known where cls came |
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# from and the precedence of classes can be determined. |
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kwargs_['_inferred_cls'] = True |
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if tasks == 1: |
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result = _do_load(obj, cls_, warn_on_fail, fork_inst, kwargs_) |
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elif tasks > 1: |
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result = multi_task(load, obj, tasks, task_type, cls_, **kwargs_) |
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else: |
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raise JsonsError('Invalid number of tasks: {}'.format(tasks)) |
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return result |
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def _do_load( |
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obj: list, |
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cls: type, |
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warn_on_fail: bool, |
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fork_inst: Type[StateHolder], |
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kwargs) -> list: |
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result = [] |
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for index, elem in enumerate(obj): |
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try: |
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result.append(load(elem, cls=cls, tasks=1, **kwargs)) |
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except DeserializationError as err: |
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new_msg = ('Could not deserialize element at index %s. %s' % |
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(index, err.message)) |
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if warn_on_fail: |
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fork_inst._warn(new_msg) |
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else: |
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new_err = DeserializationError(new_msg, err.source, err.target) |
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raise new_err from err |
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return result |
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ramonhagenaars /
jsons
