fix(anthropic): guard httpx finalizers (#37064)

libs/partners/anthropic/langchain_anthropic/_client_utils.py

@@ -22,10 +22,9 @@ class _SyncHttpxClientWrapper(anthropic.DefaultHttpxClient):
     """Borrowed from anthropic._base_client."""
 
     def __del__(self) -> None:
-        if self.is_closed:
-            return
-
         try:
+            if self.is_closed:
+                return
             self.close()
         except Exception:  # noqa: S110
             pass
@@ -35,10 +34,9 @@ class _AsyncHttpxClientWrapper(anthropic.DefaultAsyncHttpxClient):
     """Borrowed from anthropic._base_client."""
 
     def __del__(self) -> None:
-        if self.is_closed:
-            return
-
         try:
+            if self.is_closed:
+                return
             # TODO(someday): support non asyncio runtimes here
             asyncio.get_running_loop().create_task(self.aclose())
         except Exception:  # noqa: S110

libs/partners/anthropic/tests/unit_tests/test_client_utils.py

@@ -3,8 +3,10 @@
 from __future__ import annotations
 
 from langchain_anthropic._client_utils import (
+    _AsyncHttpxClientWrapper,
     _get_default_async_httpx_client,
     _get_default_httpx_client,
+    _SyncHttpxClientWrapper,
 )
 
 
@@ -60,3 +62,17 @@ def test_client_proxy_none_value() -> None:
     # Both should be created successfully with None proxy
     assert sync_client is not None
     assert async_client is not None
+
+
+def test_sync_client_wrapper_del_handles_uninitialized_client() -> None:
+    """Test sync wrapper finalizer handles clients without initialized state."""
+    client = _SyncHttpxClientWrapper.__new__(_SyncHttpxClientWrapper)
+
+    client.__del__()
+
+
+async def test_async_client_wrapper_del_handles_uninitialized_client() -> None:
+    """Test async wrapper finalizer handles clients without initialized state."""
+    client = _AsyncHttpxClientWrapper.__new__(_AsyncHttpxClientWrapper)
+
+    client.__del__()