Update RetCode to common.constants (#10984)

### What problem does this PR solve?

1. Update RetCode to common.constants
2. Decouple the admin and API modules

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

common/connection_utils.py

@@ -21,6 +21,8 @@ from typing import Any, Callable, Coroutine, Optional, Type, Union
 import asyncio
 import trio
 from functools import wraps
+from flask import make_response, jsonify
+from common.contants import RetCode
 
 TimeoutException = Union[Type[BaseException], BaseException]
 OnTimeoutCallback = Union[Callable[..., Any], Coroutine[Any, Any, Any]]
@@ -99,3 +101,22 @@ def timeout(seconds: float | int | str = None, attempts: int = 2, *, exception:
         return wrapper
 
     return decorator
+
+
+def construct_response(code=RetCode.SUCCESS, message="success", data=None, auth=None):
+    result_dict = {"code": code, "message": message, "data": data}
+    response_dict = {}
+    for key, value in result_dict.items():
+        if value is None and key != "code":
+            continue
+        else:
+            response_dict[key] = value
+    response = make_response(jsonify(response_dict))
+    if auth:
+        response.headers["Authorization"] = auth
+    response.headers["Access-Control-Allow-Origin"] = "*"
+    response.headers["Access-Control-Allow-Method"] = "*"
+    response.headers["Access-Control-Allow-Headers"] = "*"
+    response.headers["Access-Control-Allow-Headers"] = "*"
+    response.headers["Access-Control-Expose-Headers"] = "Authorization"
+    return response