Minor tweaks (#11060)

### What problem does this PR solve?

Minor tweaks

### Type of change

- [x] Refactoring

---------

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

admin/client/admin_client.py

@@ -23,6 +23,7 @@ from Cryptodome.Cipher import PKCS1_v1_5 as Cipher_pkcs1_v1_5
 from typing import Dict, List, Any
 from lark import Lark, Transformer, Tree
 import requests
+import getpass
 
 GRAMMAR = r"""
 start: command
@@ -359,7 +360,7 @@ class AdminCLI(Cmd):
             if single_command:
                 admin_passwd = arguments['password']
             else:
-                admin_passwd = input(f"password for {self.admin_account}: ").strip()
+                admin_passwd = getpass.getpass(f"password for {self.admin_account}: ").strip()
             try:
                 self.admin_password = encrypt(admin_passwd)
                 response = self.session.post(url, json={'email': self.admin_account, 'password': self.admin_password})

admin/server/auth.py

@@ -24,7 +24,7 @@ from flask_login import current_user, login_user
 from itsdangerous.url_safe import URLSafeTimedSerializer as Serializer
 
 from api.common.exceptions import AdminException, UserNotFoundError
-from api.db.init_data import encode_to_base64
+from api.common.base64 import encode_to_base64
 from api.db.services import UserService
 from common.constants import ActiveEnum, StatusEnum
 from api.utils.crypt import decrypt

agent/component/__init__.py

@@ -13,7 +13,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
-
+import logging
 import os
 import importlib
 import inspect
@@ -50,9 +50,10 @@ del _package_path, _import_submodules, _extract_classes_from_module
 
 
 def component_class(class_name):
-    for mdl in ["agent.component", "agent.tools", "rag.flow"]:
+    for module_name in ["agent.component", "agent.tools", "rag.flow"]:
         try:
-            return getattr(importlib.import_module(mdl), class_name)
-        except Exception:
+            return getattr(importlib.import_module(module_name), class_name)
+        except Exception as e:
+            logging.warning(f"Can't import module: {module_name}, error: {e}")
             pass
     assert False, f"Can't import {class_name}"

agent/component/base.py

@@ -514,6 +514,7 @@ class ComponentBase(ABC):
     def get_param(self, name):
         if hasattr(self._param, name):
             return getattr(self._param, name)
+        return None
 
     def debug(self, **kwargs):
         return self._invoke(**kwargs)
@@ -521,7 +522,7 @@ class ComponentBase(ABC):
     def get_parent(self) -> Union[object, None]:
         pid = self._canvas.get_component(self._id).get("parent_id")
         if not pid:
-            return
+            return None
         return self._canvas.get_component(pid)["obj"]
 
     def get_upstream(self) -> List[str]:
@@ -546,7 +547,7 @@ class ComponentBase(ABC):
 
     def exception_handler(self):
         if not self._param.exception_method:
-            return
+            return None
         return {
             "goto": self._param.exception_goto,
             "default_value": self._param.exception_default_value