Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

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

rag/app/audio.py

@@ -18,7 +18,7 @@ import os
 import re
 import tempfile
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from rag.nlp import rag_tokenizer, tokenize
 

rag/app/laws.py

@@ -20,7 +20,7 @@ import re
 from io import BytesIO
 from docx import Document
 
-from api.db import ParserType
+from common.constants import ParserType
 from deepdoc.parser.utils import get_text
 from rag.nlp import bullets_category, remove_contents_table, \
     make_colon_as_title, tokenize_chunks, docx_question_level, tree_merge

rag/app/manual.py

@@ -18,7 +18,7 @@ import logging
 import copy
 import re
 
-from api.db import ParserType
+from common.constants import ParserType
 from io import BytesIO
 from rag.nlp import rag_tokenizer, tokenize, tokenize_table, bullets_category, title_frequency, tokenize_chunks, docx_question_level
 from common.token_utils import num_tokens_from_string

rag/app/naive.py

@@ -28,7 +28,7 @@ from markdown import markdown
 from PIL import Image
 from tika import parser
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from rag.utils.file_utils import extract_embed_file, extract_links_from_pdf, extract_links_from_docx, extract_html
 from deepdoc.parser import DocxParser, ExcelParser, HtmlParser, JsonParser, MarkdownElementExtractor, MarkdownParser, PdfParser, TxtParser

rag/app/paper.py

@@ -19,7 +19,7 @@ import copy
 import re
 
 from deepdoc.parser.figure_parser import vision_figure_parser_pdf_wrapper
-from api.db import ParserType
+from common.constants import ParserType
 from rag.nlp import rag_tokenizer, tokenize, tokenize_table, add_positions, bullets_category, title_frequency, tokenize_chunks
 from deepdoc.parser import PdfParser, PlainParser
 import numpy as np

rag/app/picture.py

@@ -20,7 +20,7 @@ import re
 import numpy as np
 from PIL import Image
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from deepdoc.vision import OCR
 from rag.nlp import rag_tokenizer, tokenize

rag/app/presentation.py

@@ -20,7 +20,7 @@ from io import BytesIO
 
 from PIL import Image
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from deepdoc.parser.pdf_parser import VisionParser
 from rag.nlp import tokenize, is_english

rag/benchmark.py

@@ -20,7 +20,7 @@ import time
 import argparse
 from collections import defaultdict
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api import settings

rag/flow/parser/parser.py

@@ -22,7 +22,7 @@ import trio
 import numpy as np
 from PIL import Image
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.file2document_service import File2DocumentService
 from api.db.services.file_service import FileService
 from api.db.services.llm_service import LLMBundle

rag/flow/tokenizer/tokenizer.py

@@ -19,7 +19,7 @@ import re
 import numpy as np
 import trio
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.knowledgebase_service import KnowledgebaseService
 from api.db.services.llm_service import LLMBundle
 from api.db.services.user_service import TenantService

rag/prompts/generator.py

@@ -201,7 +201,7 @@ def question_proposal(chat_mdl, content, topn=3):
 
 
 def full_question(tenant_id=None, llm_id=None, messages=[], language=None, chat_mdl=None):
-    from api.db import LLMType
+    from common.constants import LLMType
     from api.db.services.llm_service import LLMBundle
     from api.db.services.tenant_llm_service import TenantLLMService
 
@@ -235,7 +235,7 @@ def full_question(tenant_id=None, llm_id=None, messages=[], language=None, chat_
 
 
 def cross_languages(tenant_id, llm_id, query, languages=[]):
-    from api.db import LLMType
+    from common.constants import LLMType
     from api.db.services.llm_service import LLMBundle
     from api.db.services.tenant_llm_service import TenantLLMService
 

rag/svr/sync_data_source.py

@@ -36,7 +36,7 @@ import tracemalloc
 import signal
 import trio
 import faulthandler
-from api.db import FileSource, TaskStatus
+from common.constants import FileSource, TaskStatus
 from api import settings
 from api.versions import get_ragflow_version
 from common.data_source.confluence_connector import ConfluenceConnector

rag/svr/task_executor.py

@@ -52,7 +52,7 @@ import exceptiongroup
 import faulthandler
 import numpy as np
 from peewee import DoesNotExist
-from api.db import LLMType, ParserType, PipelineTaskType
+from common.constants import LLMType, ParserType, PipelineTaskType
 from api.db.services.document_service import DocumentService
 from api.db.services.llm_service import LLMBundle
 from api.db.services.task_service import TaskService, has_canceled, CANVAS_DEBUG_DOC_ID, GRAPH_RAPTOR_FAKE_DOC_ID

rag/utils/constants.py

@@ -1,23 +0,0 @@
-#
-#  Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
-#
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
-#
-
-from enum import StrEnum
-
-class MCPServerType(StrEnum):
-    SSE = "sse"
-    STREAMABLE_HTTP = "streamable-http"
-
-VALID_MCP_SERVER_TYPES = {MCPServerType.SSE, MCPServerType.STREAMABLE_HTTP}

rag/utils/mcp_tool_call_conn.py

@@ -25,7 +25,7 @@ from typing import Any, Literal
 
 from typing_extensions import override
 
-from api.db import MCPServerType
+from common.constants import MCPServerType
 from mcp.client.session import ClientSession
 from mcp.client.sse import sse_client
 from mcp.client.streamable_http import streamablehttp_client