1 files changed, 38 insertions, 0 deletions
diff --git a/devscripts/lazy_load_template.py b/devscripts/lazy_load_template.py
new file mode 100644
index 0000000..c8815e0
--- /dev/null
+++ b/devscripts/lazy_load_template.py
@@ -0,0 +1,38 @@
+import importlib
+import random
+import re
+
+from ..utils import (
+    age_restricted,
+    bug_reports_message,
+    classproperty,
+    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