perf: batch fetch filter functions to eliminate N+1 queries (open-webui#21018)

Author: Classic298

backend/open_webui/models/functions.py

@@ -195,6 +195,26 @@ def get_function_by_id(
         except Exception:
             return None
 
+    def get_functions_by_ids(
+        self, ids: list[str], db: Optional[Session] = None
+    ) -> list[FunctionModel]:
+        """
+        Batch fetch multiple functions by their IDs in a single query.
+        Returns functions in the same order as the input IDs (None entries filtered out).
+        """
+        if not ids:
+            return []
+        try:
+            with get_db_context(db) as db:
+                functions = db.query(Function).filter(Function.id.in_(ids)).all()
+                # Create a dict for O(1) lookup
+                func_dict = {f.id: FunctionModel.model_validate(f) for f in functions}
+                # Return in original order, filtering out any not found
+                return [func_dict[id] for id in ids if id in func_dict]
+        except Exception:
+            return []
+
+
     def get_functions(
         self, active_only=False, include_valves=False, db: Optional[Session] = None
     ) -> list[FunctionModel | FunctionWithValvesModel]:

backend/open_webui/utils/chat.py

@@ -341,12 +341,8 @@ async def chat_completed(request: Request, form_data: dict, user: Any):
     }
 
     try:
-        filter_functions = [
-            Functions.get_function_by_id(filter_id)
-            for filter_id in get_sorted_filter_ids(
-                request, model, metadata.get("filter_ids", [])
-            )
-        ]
+        filter_ids = get_sorted_filter_ids(request, model, metadata.get("filter_ids", []))
+        filter_functions = Functions.get_functions_by_ids(filter_ids)
 
         result, _ = await process_filter_functions(
             request=request,

backend/open_webui/utils/middleware.py

@@ -1570,12 +1570,8 @@ async def process_chat_payload(request, form_data, user, metadata, model):
         raise e
 
     try:
-        filter_functions = [
-            Functions.get_function_by_id(filter_id)
-            for filter_id in get_sorted_filter_ids(
-                request, model, metadata.get("filter_ids", [])
-            )
-        ]
+        filter_ids = get_sorted_filter_ids(request, model, metadata.get("filter_ids", []))
+        filter_functions = Functions.get_functions_by_ids(filter_ids)
 
         form_data, flags = await process_filter_functions(
             request=request,