Feat: Alter flask to Quart for async API serving. (#11275)

### What problem does this PR solve?

#11277

### Type of change

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

api/db/services/connector_service.py

@@ -24,7 +24,6 @@ from api.db import InputType
 from api.db.db_models import Connector, SyncLogs, Connector2Kb, Knowledgebase
 from api.db.services.common_service import CommonService
 from api.db.services.document_service import DocumentService
-from api.db.services.file_service import FileService
 from common.misc_utils import get_uuid
 from common.constants import TaskStatus
 from common.time_utils import current_timestamp, timestamp_to_date
@@ -68,6 +67,7 @@ class ConnectorService(CommonService):
 
     @classmethod
     def rebuild(cls, kb_id:str, connector_id: str, tenant_id:str):
+        from api.db.services.file_service import FileService
         e, conn = cls.get_by_id(connector_id)
         if not e:
             return None
@@ -191,6 +191,7 @@ class SyncLogsService(CommonService):
 
     @classmethod
     def duplicate_and_parse(cls, kb, docs, tenant_id, src, auto_parse=True):
+        from api.db.services.file_service import FileService
         if not docs:
             return None
 

api/db/services/document_service.py

@@ -41,6 +41,7 @@ from rag.utils.redis_conn import REDIS_CONN
 from rag.utils.doc_store_conn import OrderByExpr
 from common import settings
 
+
 class DocumentService(CommonService):
     model = Document
 

api/db/services/file_service.py

@@ -18,7 +18,6 @@ import re
 from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
 
-from flask_login import current_user
 from peewee import fn
 
 from api.db import KNOWLEDGEBASE_FOLDER_NAME, FileType
@@ -34,6 +33,7 @@ from api.db.services.task_service import TaskService
 from api.utils.file_utils import filename_type, read_potential_broken_pdf, thumbnail_img, sanitize_path
 from rag.llm.cv_model import GptV4
 from common import settings
+from api.apps import current_user
 
 
 class FileService(CommonService):

api/db/services/knowledgebase_service.py

@@ -24,9 +24,10 @@ from common.time_utils import current_timestamp, datetime_format
 from api.db.services import duplicate_name
 from api.db.services.user_service import TenantService
 from common.misc_utils import get_uuid
-from common.constants import StatusEnum, RetCode
+from common.constants import StatusEnum
 from api.constants import DATASET_NAME_LIMIT
-from api.utils.api_utils import get_parser_config
+from api.utils.api_utils import get_parser_config, get_data_error_result
+
 
 class KnowledgebaseService(CommonService):
     """Service class for managing knowledge base operations.
@@ -391,12 +392,12 @@ class KnowledgebaseService(CommonService):
         """
         # Validate name
         if not isinstance(name, str):
-            return {"code": RetCode.DATA_ERROR, "message": "Dataset name must be string."}
+            return False, get_data_error_result(message="Dataset name must be string.")
         dataset_name = name.strip()
-        if len(dataset_name) == 0:
-            return {"code": RetCode.DATA_ERROR, "message": "Dataset name can't be empty."}
+        if dataset_name == "":
+            return False, get_data_error_result(message="Dataset name can't be empty.")
         if len(dataset_name.encode("utf-8")) > DATASET_NAME_LIMIT:
-            return {"code": RetCode.DATA_ERROR, "message": f"Dataset name length is {len(dataset_name)} which is larger than {DATASET_NAME_LIMIT}"}
+            return False, get_data_error_result(message=f"Dataset name length is {len(dataset_name)} which is larger than {DATASET_NAME_LIMIT}")
 
         # Deduplicate name within tenant
         dataset_name = duplicate_name(
@@ -409,7 +410,7 @@ class KnowledgebaseService(CommonService):
         # Verify tenant exists
         ok, _t = TenantService.get_by_id(tenant_id)
         if not ok:
-            return {"code": RetCode.DATA_ERROR, "message": "Tenant does not exist."}
+            return False, get_data_error_result(message="Tenant not found.")
 
         # Build payload
         kb_id = get_uuid()
@@ -425,7 +426,7 @@ class KnowledgebaseService(CommonService):
         # Update parser_config (always override with validated default/merged config)
         payload["parser_config"] = get_parser_config(parser_id, kwargs.get("parser_config"))
 
-        return payload
+        return True, payload
 
 
     @classmethod