refactor code (#583)

### What problem does this PR solve?

### Type of change

- [x] Refactoring

rag/svr/cache_file_svr.py

@@ -4,7 +4,7 @@ import traceback
 
 from api.db.db_models import close_connection
 from api.db.services.task_service import TaskService
-from rag.utils import MINIO
+from rag.utils.minio_conn import MINIO
 from rag.utils.redis_conn import REDIS_CONN
 
 

rag/svr/task_broker.py

@@ -24,9 +24,9 @@ from api.db.services.file2document_service import File2DocumentService
 from api.db.services.file_service import FileService
 from api.db.services.task_service import TaskService
 from deepdoc.parser import PdfParser
-from deepdoc.parser.excel_parser import HuExcelParser
+from deepdoc.parser.excel_parser import RAGFlowExcelParser
 from rag.settings import cron_logger
-from rag.utils import MINIO
+from rag.utils.minio_conn import MINIO
 from rag.utils import findMaxTm
 import pandas as pd
 from api.db import FileType, TaskStatus
@@ -121,7 +121,7 @@ def dispatch():
                         tsks.append(task)
 
             elif r["parser_id"] == "table":
-                rn = HuExcelParser.row_number(
+                rn = RAGFlowExcelParser.row_number(
                     r["name"], file_bin)
                 for i in range(0, rn, 3000):
                     task = new_task()

rag/svr/task_executor.py

@@ -26,7 +26,7 @@ import traceback
 from functools import partial
 
 from api.db.services.file2document_service import File2DocumentService
-from rag.utils import MINIO
+from rag.utils.minio_conn import MINIO
 from api.db.db_models import close_connection
 from rag.settings import database_logger
 from rag.settings import cron_logger, DOC_MAXIMUM_SIZE
@@ -35,7 +35,7 @@ import numpy as np
 from elasticsearch_dsl import Q
 from multiprocessing.context import TimeoutError
 from api.db.services.task_service import TaskService
-from rag.utils import ELASTICSEARCH
+from rag.utils.es_conn import ELASTICSEARCH
 from timeit import default_timer as timer
 from rag.utils import rmSpace, findMaxTm