Support Xinference (#320)

### What problem does this PR solve?

Issue link:#299

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/__init__.py

@@ -22,6 +22,7 @@ from werkzeug.wrappers.request import Request
 from flask_cors import CORS
 
 from api.db import StatusEnum
+from api.db.db_models import close_connection
 from api.db.services import UserService
 from api.utils import CustomJSONEncoder
 
@@ -42,7 +43,7 @@ for h in access_logger.handlers:
 Request.json = property(lambda self: self.get_json(force=True, silent=True))
 
 app = Flask(__name__)
-CORS(app, supports_credentials=True,max_age = 2592000)
+CORS(app, supports_credentials=True,max_age=2592000)
 app.url_map.strict_slashes = False
 app.json_encoder = CustomJSONEncoder
 app.errorhandler(Exception)(server_error_response)
@@ -94,8 +95,6 @@ client_urls_prefix = [
 ]
 
 
-
-
 @login_manager.request_loader
 def load_user(web_request):
     jwt = Serializer(secret_key=SECRET_KEY)
@@ -112,4 +111,9 @@ def load_user(web_request):
             stat_logger.exception(e)
             return None
     else:
-        return None
+        return None
+
+
+@app.teardown_request
+def _db_close(exc):
+    close_connection()

api/apps/conversation_app.py

@@ -360,6 +360,7 @@ def use_sql(question, field_map, tenant_id, chat_mdl):
             "|" for r in tbl["rows"]]
     rows = "\n".join([r + f" ##{ii}$$ |" for ii, r in enumerate(rows)])
     rows = re.sub(r"T[0-9]{2}:[0-9]{2}:[0-9]{2}(\.[0-9]+Z)?\|", "|", rows)
+
     if not docid_idx or not docnm_idx:
         chat_logger.warning("SQL missing field: " + sql)
         return {