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Commit | Line | Data |
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1 | import importlib | |
2 | import random | |
3 | import re | |
4 | ||
5 | from ..utils import ( | |
6 | age_restricted, | |
7 | bug_reports_message, | |
8 | classproperty, | |
9 | write_string, | |
10 | ) | |
11 | ||
12 | # These bloat the lazy_extractors, so allow them to passthrough silently | |
13 | ALLOWED_CLASSMETHODS = {'get_testcases', 'extract_from_webpage'} | |
14 | ||
15 | ||
16 | class LazyLoadMetaClass(type): | |
17 | def __getattr__(cls, name): | |
18 | if '_real_class' not in cls.__dict__ and name not in ALLOWED_CLASSMETHODS: | |
19 | write_string( | |
20 | 'WARNING: Falling back to normal extractor since lazy extractor ' | |
21 | f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n') | |
22 | return getattr(cls.real_class, name) | |
23 | ||
24 | ||
25 | class LazyLoadExtractor(metaclass=LazyLoadMetaClass): | |
26 | @classproperty | |
27 | def real_class(cls): | |
28 | if '_real_class' not in cls.__dict__: | |
29 | cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__) | |
30 | return cls._real_class | |
31 | ||
32 | def __new__(cls, *args, **kwargs): | |
33 | instance = cls.real_class.__new__(cls.real_class) | |
34 | instance.__init__(*args, **kwargs) | |
35 | return instance |