yt_dlp/compat/compat_utils.py

   1 import collections
   2 import contextlib
   3 import functools
   4 import importlib
   5 import sys
   6 import types
   7
   8 _NO_ATTRIBUTE = object()
   9
  10 _Package = collections.namedtuple('Package', ('name', 'version'))
  11
  12
  13 def get_package_info(module):
  14     return _Package(
  15         name=getattr(module, '_yt_dlp__identifier', module.__name__),
  16         version=str(next(filter(None, (
  17             getattr(module, attr, None)
  18             for attr in ('_yt_dlp__version', '__version__', 'version_string', 'version')
  19         )), None)))
  20
  21
  22 def _is_package(module):
  23     return '__path__' in vars(module)
  24
  25
  26 def _is_dunder(name):
  27     return name.startswith('__') and name.endswith('__')
  28
  29
  30 class EnhancedModule(types.ModuleType):
  31     def __bool__(self):
  32         return vars(self).get('__bool__', lambda: True)()
  33
  34     def __getattribute__(self, attr):
  35         try:
  36             ret = super().__getattribute__(attr)
  37         except AttributeError:
  38             if _is_dunder(attr):
  39                 raise
  40             getter = getattr(self, '__getattr__', None)
  41             if not getter:
  42                 raise
  43             ret = getter(attr)
  44         return ret.fget() if isinstance(ret, property) else ret
  45
  46
  47 def passthrough_module(parent, child, allowed_attributes=(..., ), *, callback=lambda _: None):
  48     """Passthrough parent module into a child module, creating the parent if necessary"""
  49     def __getattr__(attr):
  50         if _is_package(parent):
  51             with contextlib.suppress(ModuleNotFoundError):
  52                 return importlib.import_module(f'.{attr}', parent.__name__)
  53
  54         ret = from_child(attr)
  55         if ret is _NO_ATTRIBUTE:
  56             raise AttributeError(f'module {parent.__name__} has no attribute {attr}')
  57         callback(attr)
  58         return ret
  59
  60     @functools.lru_cache(maxsize=None)
  61     def from_child(attr):
  62         nonlocal child
  63         if attr not in allowed_attributes:
  64             if ... not in allowed_attributes or _is_dunder(attr):
  65                 return _NO_ATTRIBUTE
  66
  67         if isinstance(child, str):
  68             child = importlib.import_module(child, parent.__name__)
  69
  70         if _is_package(child):
  71             with contextlib.suppress(ImportError):
  72                 return passthrough_module(f'{parent.__name__}.{attr}',
  73                                           importlib.import_module(f'.{attr}', child.__name__))
  74
  75         with contextlib.suppress(AttributeError):
  76             return getattr(child, attr)
  77
  78         return _NO_ATTRIBUTE
  79
  80     parent = sys.modules.get(parent, types.ModuleType(parent))
  81     parent.__class__ = EnhancedModule
  82     parent.__getattr__ = __getattr__
  83     return parent