2022-05-11 09:54:44 -06:00
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import importlib
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import random
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2016-02-10 06:01:31 -07:00
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import re
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2022-05-16 08:06:36 -06:00
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from ..utils import (
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age_restricted,
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bug_reports_message,
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classproperty,
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2023-06-21 15:27:00 -06:00
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variadic,
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2022-05-16 08:06:36 -06:00
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write_string,
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)
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2021-09-17 12:23:55 -06:00
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2022-07-31 19:22:03 -06:00
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# These bloat the lazy_extractors, so allow them to passthrough silently
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2022-11-15 17:57:43 -07:00
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ALLOWED_CLASSMETHODS = {'extract_from_webpage', 'get_testcases', 'get_webpage_testcases'}
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2022-08-24 03:40:21 -06:00
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_WARNED = False
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2022-07-31 19:22:03 -06:00
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2016-02-10 06:01:31 -07:00
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2021-08-22 16:18:26 -06:00
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class LazyLoadMetaClass(type):
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def __getattr__(cls, name):
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2022-08-24 03:40:21 -06:00
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global _WARNED
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if ('_real_class' not in cls.__dict__
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and name not in ALLOWED_CLASSMETHODS and not _WARNED):
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_WARNED = True
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write_string('WARNING: Falling back to normal extractor since lazy extractor '
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f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n')
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2022-05-11 09:54:44 -06:00
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return getattr(cls.real_class, name)
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2021-08-22 16:18:26 -06:00
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class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
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2022-05-11 09:54:44 -06:00
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@classproperty
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def real_class(cls):
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2021-09-17 12:23:55 -06:00
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if '_real_class' not in cls.__dict__:
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2022-05-11 09:54:44 -06:00
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cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
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2021-09-17 12:23:55 -06:00
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return cls._real_class
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2021-08-22 16:18:26 -06:00
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2016-02-21 04:46:14 -07:00
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def __new__(cls, *args, **kwargs):
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2022-05-11 09:54:44 -06:00
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instance = cls.real_class.__new__(cls.real_class)
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2016-02-21 04:46:14 -07:00
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instance.__init__(*args, **kwargs)
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return instance
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