Refactor (#537)

### What problem does this PR solve?

### Type of change

- [x] Refactoring

api/db/services/task_service.py

@@ -21,6 +21,7 @@ from api.db import StatusEnum, FileType, TaskStatus
 from api.db.db_models import Task, Document, Knowledgebase, Tenant
 from api.db.services.common_service import CommonService
 from api.db.services.document_service import DocumentService
+from api.utils import current_timestamp
 
 
 class TaskService(CommonService):
@@ -70,6 +71,25 @@ class TaskService(CommonService):
                 cls.model.id == docs[0]["id"]).execute()
             return docs
 
+    @classmethod
+    @DB.connection_context()
+    def get_ongoing_doc_name(cls):
+        with DB.lock("get_task", -1):
+            docs = cls.model.select(*[Document.kb_id, Document.location]) \
+                .join(Document, on=(cls.model.doc_id == Document.id)) \
+                .where(
+                    Document.status == StatusEnum.VALID.value,
+                    Document.run == TaskStatus.RUNNING.value,
+                    ~(Document.type == FileType.VIRTUAL.value),
+                    cls.model.progress >= 0,
+                    cls.model.progress < 1,
+                    cls.model.create_time >= current_timestamp() - 180000
+                )
+            docs = list(docs.dicts())
+            if not docs: return []
+
+            return list(set([(d["kb_id"], d["location"]) for d in docs]))
+
     @classmethod
     @DB.connection_context()
     def do_cancel(cls, id):