-# encoding: utf-8
-from __future__ import unicode_literals
-
+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(object):
- _module = None
- @classmethod
- def ie_key(cls):
- return cls.__name__[:-2]
+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):
- mod = __import__(cls._module, fromlist=(cls.__name__,))
- real_cls = getattr(mod, cls.__name__)
- instance = real_cls.__new__(real_cls)
+ instance = cls.real_class.__new__(cls.real_class)
instance.__init__(*args, **kwargs)
return instance