206 lines
7.9 KiB
Python
206 lines
7.9 KiB
Python
#!/user/bin/env python3
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"""
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File_Name: es_kb_service.py
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Author: TangGuoLiang
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Email: 896165277@qq.com
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Created: 2023-09-05
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"""
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from typing import List
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import os
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import shutil
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from langchain.embeddings.base import Embeddings
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from langchain.schema import Document
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from langchain.vectorstores.elasticsearch import ElasticsearchStore
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from configs import KB_ROOT_PATH, EMBEDDING_MODEL, EMBEDDING_DEVICE, CACHED_VS_NUM
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from server.knowledge_base.kb_service.base import KBService, SupportedVSType
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from server.utils import load_local_embeddings
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from elasticsearch import Elasticsearch
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from configs import logger
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from configs import kbs_config
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class ESKBService(KBService):
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def do_init(self):
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self.kb_path = self.get_kb_path(self.kb_name)
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self.index_name = self.kb_path.split("/")[-1]
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self.IP = kbs_config[self.vs_type()]['host']
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self.PORT = kbs_config[self.vs_type()]['port']
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self.user = kbs_config[self.vs_type()].get("user",'')
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self.password = kbs_config[self.vs_type()].get("password",'')
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self.embeddings_model = load_local_embeddings(self.embed_model, EMBEDDING_DEVICE)
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try:
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# ES python客户端连接（仅连接）
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if self.user != "" and self.password != "":
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self.es_client_python = Elasticsearch(f"http://{self.IP}:{self.PORT}",
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basic_auth=(self.user,self.password))
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else:
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logger.warning("ES未配置用户名和密码")
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self.es_client_python = Elasticsearch(f"http://{self.IP}:{self.PORT}")
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self.es_client_python.indices.create(index=self.index_name)
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except ConnectionError:
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logger.error("连接到 Elasticsearch 失败！")
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except Exception as e:
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logger.error(f"Error 发生 : {e}")
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try:
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# langchain ES 连接、创建索引
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if self.user != "" and self.password != "":
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self.db_init = ElasticsearchStore(
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es_url=f"http://{self.IP}:{self.PORT}",
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index_name=self.index_name,
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query_field="context",
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vector_query_field="dense_vector",
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embedding=self.embeddings_model,
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es_user=self.user,
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es_password=self.password
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)
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else:
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logger.warning("ES未配置用户名和密码")
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self.db_init = ElasticsearchStore(
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es_url=f"http://{self.IP}:{self.PORT}",
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index_name=self.index_name,
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query_field="context",
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vector_query_field="dense_vector",
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embedding=self.embeddings_model,
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)
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except ConnectionError:
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print("### 连接到 Elasticsearch 失败！")
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logger.error("### 连接到 Elasticsearch 失败！")
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except Exception as e:
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logger.error(f"Error 发生 : {e}")
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@staticmethod
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def get_kb_path(knowledge_base_name: str):
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return os.path.join(KB_ROOT_PATH, knowledge_base_name)
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@staticmethod
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def get_vs_path(knowledge_base_name: str):
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return os.path.join(ESKBService.get_kb_path(knowledge_base_name), "vector_store")
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def do_create_kb(self):
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if os.path.exists(self.doc_path):
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if not os.path.exists(os.path.join(self.kb_path, "vector_store")):
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os.makedirs(os.path.join(self.kb_path, "vector_store"))
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else:
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logger.warning("directory `vector_store` already exists.")
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def vs_type(self) -> str:
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return SupportedVSType.ES
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def _load_es(self, docs, embed_model):
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# 将docs写入到ES中
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try:
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# 连接 + 同时写入文档
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if self.user != "" and self.password != "":
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self.db = ElasticsearchStore.from_documents(
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documents=docs,
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embedding=embed_model,
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es_url= f"http://{self.IP}:{self.PORT}",
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index_name=self.index_name,
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distance_strategy="COSINE",
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query_field="context",
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vector_query_field="dense_vector",
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verify_certs=False,
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es_user=self.user,
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es_password=self.password
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)
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else:
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self.db = ElasticsearchStore.from_documents(
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documents=docs,
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embedding=embed_model,
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es_url= f"http://{self.IP}:{self.PORT}",
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index_name=self.index_name,
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distance_strategy="COSINE",
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query_field="context",
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vector_query_field="dense_vector",
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verify_certs=False)
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except ConnectionError as ce:
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print(ce)
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print("连接到 Elasticsearch 失败！")
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logger.error("连接到 Elasticsearch 失败！")
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except Exception as e:
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logger.error(f"Error 发生 : {e}")
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print(e)
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def do_search(self, query:str, top_k: int, score_threshold: float):
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# 文本相似性检索
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docs = self.db_init.similarity_search_with_score(query=query,
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k=top_k)
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return docs
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def do_delete_doc(self, kb_file, **kwargs):
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if self.es_client_python.indices.exists(index=self.index_name):
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# 从向量数据库中删除索引(文档名称是Keyword)
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query = {
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"query": {
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"term": {
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"metadata.source.keyword": kb_file.filepath
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}
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}
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}
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# 注意设置size，默认返回10个。
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search_results = self.es_client_python.search(body=query, size=50)
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delete_list = [hit["_id"] for hit in search_results['hits']['hits']]
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if len(delete_list) == 0:
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return None
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else:
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for doc_id in delete_list:
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try:
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self.es_client_python.delete(index=self.index_name,
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id=doc_id,
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refresh=True)
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except Exception as e:
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logger.error("ES Docs Delete Error!")
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# self.db_init.delete(ids=delete_list)
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#self.es_client_python.indices.refresh(index=self.index_name)
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def do_add_doc(self, docs: List[Document], **kwargs):
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'''向知识库添加文件'''
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print(f"server.knowledge_base.kb_service.es_kb_service.do_add_doc 输入的docs参数长度为:{len(docs)}")
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print("*"*100)
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self._load_es(docs=docs, embed_model=self.embeddings_model)
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# 获取 id 和 source , 格式：[{"id": str, "metadata": dict}, ...]
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print("写入数据成功.")
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print("*"*100)
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if self.es_client_python.indices.exists(index=self.index_name):
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file_path = docs[0].metadata.get("source")
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query = {
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"query": {
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"term": {
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"metadata.source.keyword": file_path
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}
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}
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}
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search_results = self.es_client_python.search(body=query)
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if len(search_results["hits"]["hits"]) == 0:
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raise ValueError("召回元素个数为0")
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info_docs = [{"id":hit["_id"], "metadata": hit["_source"]["metadata"]} for hit in search_results["hits"]["hits"]]
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return info_docs
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def do_clear_vs(self):
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"""从知识库删除全部向量"""
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if self.es_client_python.indices.exists(index=self.kb_name):
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self.es_client_python.indices.delete(index=self.kb_name)
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def do_drop_kb(self):
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"""删除知识库"""
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# self.kb_file: 知识库路径
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if os.path.exists(self.kb_path):
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shutil.rmtree(self.kb_path)
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