[ADD]Add functions related to knowledge base graph:

Add functions related to knowledge base graph:
1. Entity type generation,
2. Knowledge base graph acquisition,
3. Hard deletion of knowledge base graph,
4. Knowledge base graph reconstruction (asynchronous)

api/app/core/rag/common/decorator.py

@@ -0,0 +1,13 @@
+import os
+
+
+def singleton(cls, *args, **kw):
+    instances = {}
+
+    def _singleton():
+        key = str(cls) + str(os.getpid())
+        if key not in instances:
+            instances[key] = cls(*args, **kw)
+        return instances[key]
+
+    return _singleton

api/app/core/rag/common/exceptions.py

@@ -0,0 +1,4 @@
+
+class TaskCanceledException(Exception):
+    def __init__(self, msg):
+        self.msg = msg

api/app/core/rag/common/log_utils.py

@@ -0,0 +1,13 @@
+import os
+import logging
+
+
+def log_exception(e, *args):
+    logging.exception(e)
+    for a in args:
+        if hasattr(a, "text"):
+            logging.error(a.text)
+            raise Exception(a.text)
+        else:
+            logging.error(str(a))
+    raise e

api/app/core/rag/common/settings.py

@@ -1,2 +1,24 @@
+from app.core.rag.utils import es_conn
+from app.core.rag.nlp import search
+from app.core.rag.graphrag import search as kg_search
+
 PARALLEL_DEVICES: int = 0
 
+docStoreConn = None
+
+retriever = None
+kg_retriever = None
+
+
+def init_settings():
+    global docStoreConn, retriever, kg_retriever
+
+    if docStoreConn is None:
+        docStoreConn = es_conn.ESConnection()
+    if retriever is None:
+        retriever = search.Dealer(docStoreConn)
+    if kg_retriever is None:
+        kg_retriever = kg_search.KGSearch(docStoreConn)
+
+
+init_settings()