bug fix

app/main.py

@@ -717,25 +717,15 @@ async def chat_completions(request: OpenAIRequest, api_key: str = Depends(get_ap
         # Create generation config
         generation_config = create_generation_config(request)
         
-        # Get fresh credentials for this request
-        credentials, project_id = credential_manager.get_next_credentials()
-        
-        if not credentials or not project_id:
-            error_response = create_openai_error_response(
-                500, "Failed to obtain valid credentials", "server_error"
-            )
-            return JSONResponse(status_code=500, content=error_response)
-        
-        # Initialize Vertex AI with the rotated credentials
-        try:
-            # Re-initialize client for this request - credentials might have rotated
-            client = genai.Client(vertexai=True, credentials=credentials, project=project_id, location="us-central1")
-            print(f"Using credentials for project: {project_id} for this request")
-        except Exception as auth_error:
-            error_response = create_openai_error_response(
-                500, f"Failed to initialize authentication: {str(auth_error)}", "server_error"
-            )
-            return JSONResponse(status_code=500, content=error_response)
+        # Use the globally initialized client (from startup)
+        global client
+        if client is None:
+             # This should ideally not happen if startup was successful
+             error_response = create_openai_error_response(
+                 500, "Vertex AI client not initialized", "server_error"
+             )
+             return JSONResponse(status_code=500, content=error_response)
+        print(f"Using globally initialized client for project: {client.project}") # Assuming client has project attribute
         
         # Initialize Gemini model
         search_tool = types.Tool(google_search=types.GoogleSearch())