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40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import importlib
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import random
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import re
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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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variadic,
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write_string,
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)
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# These bloat the lazy_extractors, so allow them to passthrough silently
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ALLOWED_CLASSMETHODS = {'extract_from_webpage', 'get_testcases', 'get_webpage_testcases'}
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_WARNED = False
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class LazyLoadMetaClass(type):
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def __getattr__(cls, name):
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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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return getattr(cls.real_class, name)
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class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
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@classproperty
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def real_class(cls):
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if '_real_class' not in cls.__dict__:
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cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
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return cls._real_class
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def __new__(cls, *args, **kwargs):
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instance = cls.real_class.__new__(cls.real_class)
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instance.__init__(*args, **kwargs)
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return instance
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