fix(llm_caching_handler.py): Add event loop to llm client cache info

Fixes https://github.com/BerriAI/litellm/issues/7667

litellm/caching/llm_caching_handler.py

@@ -0,0 +1,37 @@
+"""
+Add the event loop to the cache key, to prevent event loop closed errors.
+"""
+
+import asyncio
+
+from .in_memory_cache import InMemoryCache
+
+
+class LLMClientCache(InMemoryCache):
+
+    def update_cache_key_with_event_loop(self, key):
+        """
+        Add the event loop to the cache key, to prevent event loop closed errors.
+        If none, use the key as is.
+        """
+        event_loop = asyncio.get_event_loop()
+        stringified_event_loop = str(id(event_loop))
+        return f"{key}-{stringified_event_loop}"
+
+    def set_cache(self, key, value, **kwargs):
+        key = self.update_cache_key_with_event_loop(key)
+        return super().set_cache(key, value, **kwargs)
+
+    async def async_set_cache(self, key, value, **kwargs):
+        key = self.update_cache_key_with_event_loop(key)
+        return await super().async_set_cache(key, value, **kwargs)
+
+    def get_cache(self, key, **kwargs):
+        key = self.update_cache_key_with_event_loop(key)
+
+        return super().get_cache(key, **kwargs)
+
+    async def async_get_cache(self, key, **kwargs):
+        key = self.update_cache_key_with_event_loop(key)
+
+        return await super().async_get_cache(key, **kwargs)