Unify db api

engine/core/tool_executor.py

@@ -4,11 +4,13 @@ import asyncio
 import ast
 import operator
 from datetime import datetime
-from typing import Any, Dict
+from typing import Any, Awaitable, Callable, Dict, Optional
 
 import aiohttp
 
-from app.backend_client import fetch_tool_resource
+from app.backend_adapters import build_backend_adapter_from_settings
+
+ToolResourceFetcher = Callable[[str], Awaitable[Optional[Dict[str, Any]]]]
 
 _BIN_OPS = {
     ast.Add: operator.add,
@@ -170,11 +172,21 @@ def _extract_tool_args(tool_call: Dict[str, Any]) -> Dict[str, Any]:
         return {}
 
 
-async def execute_server_tool(tool_call: Dict[str, Any]) -> Dict[str, Any]:
+async def fetch_tool_resource(tool_id: str) -> Optional[Dict[str, Any]]:
+    """Default tool resource resolver via backend adapter."""
+    adapter = build_backend_adapter_from_settings()
+    return await adapter.fetch_tool_resource(tool_id)
+
+
+async def execute_server_tool(
+    tool_call: Dict[str, Any],
+    tool_resource_fetcher: Optional[ToolResourceFetcher] = None,
+) -> Dict[str, Any]:
     """Execute a server-side tool and return normalized result payload."""
     call_id = str(tool_call.get("id") or "").strip()
     tool_name = _extract_tool_name(tool_call)
     args = _extract_tool_args(tool_call)
+    resource_fetcher = tool_resource_fetcher or fetch_tool_resource
 
     if tool_name == "calculator":
         expression = str(args.get("expression") or "").strip()
@@ -257,7 +269,7 @@ async def execute_server_tool(tool_call: Dict[str, Any]) -> Dict[str, Any]:
         }
 
     if tool_name and tool_name not in {"calculator", "code_interpreter", "current_time"}:
-        resource = await fetch_tool_resource(tool_name)
+        resource = await resource_fetcher(tool_name)
         if resource and str(resource.get("category") or "") == "query":
             method = str(resource.get("http_method") or "GET").strip().upper()
             if method not in {"GET", "POST", "PUT", "PATCH", "DELETE"}: