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import importlib
import random
import re
from ..utils import (
age_restricted,
bug_reports_message,
classproperty,
variadic,
write_string,
)
# These bloat the lazy_extractors, so allow them to passthrough silently
ALLOWED_CLASSMETHODS = {'extract_from_webpage', 'get_testcases', 'get_webpage_testcases'}
_WARNED = False
class LazyLoadMetaClass(type):
def __getattr__(cls, name):
global _WARNED
if ('_real_class' not in cls.__dict__
and name not in ALLOWED_CLASSMETHODS and not _WARNED):
_WARNED = True
write_string('WARNING: Falling back to normal extractor since lazy extractor '
f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n')
return getattr(cls.real_class, name)
class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
@classproperty
def real_class(cls):
if '_real_class' not in cls.__dict__:
cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
return cls._real_class
def __new__(cls, *args, **kwargs):
instance = cls.real_class.__new__(cls.real_class)
instance.__init__(*args, **kwargs)
return instance
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