Refactor:Improve the logic so that it does not decode base 64 for the test image each time (#9264)

### What problem does this PR solve?

Improve the logic so that it does not decode base 64 for the test image
each time

### Type of change

- [x] Refactoring
- [x] Performance Improvement

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

api/apps/llm_app.py

@@ -15,7 +15,6 @@
 #
 import logging
 import json
-import base64
 from flask import request
 from flask_login import login_required, current_user
 from api.db.services.llm_service import LLMFactoriesService, TenantLLMService, LLMService
@@ -24,7 +23,7 @@ from api.utils.api_utils import server_error_response, get_data_error_result, va
 from api.db import StatusEnum, LLMType
 from api.db.db_models import TenantLLM
 from api.utils.api_utils import get_json_result
-from api.utils.base64_image import test_image_base64
+from api.utils.base64_image import test_image
 from rag.llm import EmbeddingModel, ChatModel, RerankModel, CvModel, TTSModel
 
 
@@ -256,7 +255,7 @@ def add_llm():
             base_url=llm["api_base"]
         )
         try:
-            image_data = base64.b64decode(test_image_base64)
+            image_data = test_image
             m, tc = mdl.describe(image_data)
             if not m and not tc:
                 raise Exception(m)

api/utils/base64_image.py

@@ -1 +1,3 @@
+import base64
 test_image_base64 = "iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAA6ElEQVR4nO3QwQ3AIBDAsIP9d25XIC+EZE8QZc18w5l9O+AlZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBWYFZgVmBT+IYAHHLHkdEgAAAABJRU5ErkJggg=="
+test_image = base64.b64decode(test_image_base64)