fix: unbreak client closed errors when using vertexai session service

PiperOrigin-RevId: 811911528

Author: sasha-gitg

google/genai/_api_client.py

@@ -1775,3 +1775,20 @@ async def aclose(self) -> None:
     await self._async_httpx_client.aclose()
     if self._aiohttp_session:
       await self._aiohttp_session.close()
+
+  def __del__(self) -> None:
+    """Closes the API client when the object is garbage collected.
+
+    ADK uses this client so cannot rely on the genai.[Async]Client.__del__
+    for cleanup.
+    """
+
+    try:
+      self.close()
+    except Exception:  # pylint: disable=broad-except
+      pass
+
+    try:
+      asyncio.get_running_loop().create_task(self.aclose())
+    except Exception:  # pylint: disable=broad-except
+      pass

google/genai/client.py

@@ -13,6 +13,7 @@
 # limitations under the License.
 #
 
+import asyncio
 import os
 from types import TracebackType
 from typing import Optional, Union
@@ -125,7 +126,6 @@ async def __aexit__(
     await self.aclose()
 
   def __del__(self) -> None:
-    import asyncio
     try:
       asyncio.get_running_loop().create_task(self.aclose())
     except Exception: