Major fixes and new features

venv/lib/python3.12/site-packages/structlog/_greenlets.py

@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: MIT OR Apache-2.0
+# This file is dual licensed under the terms of the Apache License, Version
+# 2.0, and the MIT License.  See the LICENSE file in the root of this
+# repository for complete details.
+
+"""
+greenlet-specific code that pretends to be a `threading.local`.
+
+Fails to import if not running under greenlet.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+from weakref import WeakKeyDictionary
+
+from greenlet import getcurrent
+
+
+class GreenThreadLocal:
+    """
+    threading.local() replacement for greenlets.
+    """
+
+    def __init__(self) -> None:
+        self.__dict__["_weakdict"] = WeakKeyDictionary()
+
+    def __getattr__(self, name: str) -> Any:
+        key = getcurrent()
+        try:
+            return self._weakdict[key][name]
+        except KeyError:
+            raise AttributeError(name) from None
+
+    def __setattr__(self, name: str, val: Any) -> None:
+        key = getcurrent()
+        self._weakdict.setdefault(key, {})[name] = val
+
+    def __delattr__(self, name: str) -> None:
+        key = getcurrent()
+        try:
+            del self._weakdict[key][name]
+        except KeyError:
+            raise AttributeError(name) from None