339 lines
13 KiB
Python
339 lines
13 KiB
Python
import os
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import time
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import traceback
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import json
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from pathlib import Path
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from typing import Optional, Dict, List, Any
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from datetime import datetime
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import chromadb
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from chromadb.config import Settings
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from chromadb.api.types import EmbeddingFunction, Documents, Embeddings
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from chromadb.utils.embedding_functions import OpenAIEmbeddingFunction
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from src.knowledge.knowledge_base import KnowledgeBase
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from src.knowledge.kb_utils import split_text_into_chunks, prepare_item_metadata, get_embedding_config
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from src.utils import logger, hashstr
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from src import config
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class ChromaKB(KnowledgeBase):
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"""基于 ChromaDB 的向量知识库实现"""
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def __init__(self, work_dir: str, **kwargs):
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"""
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初始化 ChromaDB 知识库
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Args:
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work_dir: 工作目录
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**kwargs: 其他配置参数
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"""
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super().__init__(work_dir)
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if chromadb is None:
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raise ImportError("chromadb is not installed. Please install it with: pip install chromadb")
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# ChromaDB 配置
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self.chroma_db_path = os.path.join(work_dir, "chromadb")
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os.makedirs(self.chroma_db_path, exist_ok=True)
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# 初始化 ChromaDB 客户端
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self.chroma_client = chromadb.PersistentClient(
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path=self.chroma_db_path,
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settings=Settings(anonymized_telemetry=False)
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)
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# 存储集合映射 {db_id: collection}
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self.collections: Dict[str, Any] = {}
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# 分块配置
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self.chunk_size = kwargs.get('chunk_size', 1000)
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self.chunk_overlap = kwargs.get('chunk_overlap', 200)
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logger.info("ChromaKB initialized")
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@property
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def kb_type(self) -> str:
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"""知识库类型标识"""
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return "chroma"
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async def _create_kb_instance(self, db_id: str, config: Dict) -> Any:
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"""创建向量数据库集合"""
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logger.info(f"Creating ChromaDB collection for {db_id}")
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if db_id not in self.databases_meta:
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raise ValueError(f"Database {db_id} not found")
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embed_info = self.databases_meta[db_id].get("embed_info", {})
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embedding_function = self._get_embedding_function(embed_info)
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# 创建或获取集合
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collection_name = f"kb_{db_id}"
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try:
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# 尝试获取现有集合
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collection = self.chroma_client.get_collection(
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name=collection_name,
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embedding_function=embedding_function
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)
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logger.info(f"Retrieved existing collection: {collection_name}")
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# 检查现有集合的配置是否匹配当前的 embed_info
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expected_model = embed_info.get("name") if embed_info else "default"
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collection_metadata = collection.metadata or {}
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current_model = collection_metadata.get("embedding_model", "unknown")
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logger.debug(f"Collection {collection_name} uses model '{current_model}', but expected '{expected_model}'.")
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# 如果模型不匹配，删除现有集合并重新创建
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if current_model != expected_model:
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logger.warning(f"Collection {collection_name} uses model '{current_model}', but expected '{expected_model}'. Recreating collection.")
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self.chroma_client.delete_collection(name=collection_name)
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raise Exception("Model mismatch, recreating collection")
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except Exception as e:
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# 创建新集合
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logger.info(f"Creating new collection with embedding model: {embed_info.get('name', 'default')}")
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collection_metadata = {
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"db_id": db_id,
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"created_at": datetime.now().isoformat(),
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"embedding_model": embed_info.get("name") if embed_info else "default"
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}
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collection = self.chroma_client.create_collection(
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name=collection_name,
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embedding_function=embedding_function,
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metadata=collection_metadata
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)
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logger.info(f"Created new collection: {collection_name}")
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return collection
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async def _initialize_kb_instance(self, instance: Any) -> None:
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"""初始化向量数据库集合（无需特殊初始化）"""
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pass
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def _get_embedding_function(self, embed_info: Dict):
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"""获取 embedding 函数"""
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config_dict = get_embedding_config(embed_info)
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return OpenAIEmbeddingFunction(
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model_name=config_dict["model"],
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api_key=config_dict["api_key"],
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api_base=config_dict["base_url"].replace('/embeddings', '')
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)
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async def _get_chroma_collection(self, db_id: str):
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"""获取或创建 ChromaDB 集合"""
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if db_id in self.collections:
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return self.collections[db_id]
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if db_id not in self.databases_meta:
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return None
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try:
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# 创建集合
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collection = await self._create_kb_instance(db_id, {})
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await self._initialize_kb_instance(collection)
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self.collections[db_id] = collection
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return collection
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except Exception as e:
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logger.error(f"Failed to create vector collection for {db_id}: {e}")
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logger.error(f"Traceback: {traceback.format_exc()}")
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return None
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def _split_text_into_chunks(self, text: str, file_id: str, filename: str) -> List[Dict]:
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"""将文本分割成块"""
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chunks = split_text_into_chunks(text, file_id, filename, self.chunk_size, self.chunk_overlap)
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# 为 ChromaDB 添加特定的 metadata 格式
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for chunk in chunks:
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chunk["metadata"] = {
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"source": chunk["source"],
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"chunk_id": chunk["chunk_id"],
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"full_doc_id": file_id
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}
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return chunks
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async def add_content(self, db_id: str, items: List[str],
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params: Optional[Dict] = None) -> List[Dict]:
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"""添加内容（文件/URL）"""
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if db_id not in self.databases_meta:
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raise ValueError(f"Database {db_id} not found")
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collection = await self._get_chroma_collection(db_id)
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if not collection:
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raise ValueError(f"Failed to get ChromaDB collection for {db_id}")
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content_type = params.get('content_type', 'file') if params else 'file'
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processed_items_info = []
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for item in items:
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# 准备文件元数据
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metadata = prepare_item_metadata(item, content_type, db_id)
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file_id = metadata["file_id"]
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filename = metadata["filename"]
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item_path = metadata["path"]
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# 添加文件记录
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file_record = metadata.copy()
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self.files_meta[file_id] = file_record
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self._save_metadata()
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try:
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# 根据内容类型处理内容
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if content_type == "file":
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markdown_content = await self._process_file_to_markdown(item, params=params)
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else: # URL
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markdown_content = await self._process_url_to_markdown(item, params=params)
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# 分割文本成块
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chunks = self._split_text_into_chunks(markdown_content, file_id, filename)
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logger.info(f"Split {filename} into {len(chunks)} chunks")
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# 准备向量数据库插入的数据
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if chunks:
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documents = [chunk["content"] for chunk in chunks]
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metadatas = [chunk["metadata"] for chunk in chunks]
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ids = [chunk["id"] for chunk in chunks]
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# 插入到 ChromaDB
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collection.add(
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documents=documents,
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metadatas=metadatas,
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ids=ids
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)
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logger.info(f"Inserted {content_type} {item} into ChromaDB. Done.")
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# 更新状态为完成
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self.files_meta[file_id]["status"] = "done"
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self._save_metadata()
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file_record['status'] = "done"
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except Exception as e:
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logger.error(f"处理{content_type} {item} 失败: {e}, {traceback.format_exc()}")
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self.files_meta[file_id]["status"] = "failed"
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self._save_metadata()
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file_record['status'] = "failed"
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processed_items_info.append(file_record)
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return processed_items_info
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async def aquery(self, query_text: str, db_id: str, **kwargs) -> str:
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"""异步查询知识库"""
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collection = await self._get_chroma_collection(db_id)
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if not collection:
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raise ValueError(f"Database {db_id} not found")
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try:
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# 设置查询参数 - ChromaDB 知识库特有的参数
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top_k = kwargs.get("top_k", 10)
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similarity_threshold = kwargs.get("similarity_threshold", 0.0) # 相似度阈值
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include_distances = kwargs.get("include_distances", True) # 是否包含距离信息
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# 执行相似性搜索
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results = collection.query(
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query_texts=[query_text],
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n_results=top_k,
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include=["documents", "metadatas", "distances"] if include_distances else ["documents", "metadatas"]
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)
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# 处理结果
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if results and results.get("documents") and results["documents"][0]:
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documents = results["documents"][0]
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metadatas = results["metadatas"][0] if results.get("metadatas") else []
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distances = results["distances"][0] if results.get("distances") else []
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# 构建上下文，应用相似度阈值过滤
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contexts = []
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for i, doc in enumerate(documents):
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# 计算相似度（距离越小相似度越高）
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similarity = 1 - distances[i] if i < len(distances) else 1.0
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# 应用相似度阈值过滤
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if similarity < similarity_threshold:
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continue
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context = f"[文档片段 {i+1}]:\n{doc}\n"
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if i < len(metadatas) and metadatas[i]:
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source = metadatas[i].get("source", "未知来源")
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chunk_id = metadatas[i].get("chunk_id", f"chunk_{i}")
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context += f"来源: {source} ({chunk_id})\n"
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if include_distances and i < len(distances):
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context += f"相似度: {similarity:.3f}\n"
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contexts.append(context)
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response = "\n".join(contexts)
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logger.debug(f"ChromaDB query response: {len(contexts)} chunks found (after similarity filtering)")
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return response
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return ""
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except Exception as e:
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logger.error(f"ChromaDB query error: {e}, {traceback.format_exc()}")
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return ""
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async def delete_file(self, db_id: str, file_id: str) -> None:
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"""删除文件"""
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collection = await self._get_chroma_collection(db_id)
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if collection:
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try:
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# 查找所有相关的chunks
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results = collection.get(
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where={"full_doc_id": file_id},
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include=["metadatas"]
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)
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# 删除所有相关chunks
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if results and results.get("ids"):
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collection.delete(ids=results["ids"])
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logger.info(f"Deleted {len(results['ids'])} chunks for file {file_id}")
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except Exception as e:
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logger.error(f"Error deleting file {file_id} from ChromaDB: {e}")
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# 删除文件记录
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if file_id in self.files_meta:
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del self.files_meta[file_id]
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self._save_metadata()
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async def get_file_info(self, db_id: str, file_id: str) -> Dict:
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"""获取文件信息和chunks"""
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if file_id not in self.files_meta:
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raise Exception(f"File not found: {file_id}")
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# 使用 ChromaDB 获取chunks
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collection = await self._get_chroma_collection(db_id)
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if collection:
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try:
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# 获取文档的所有chunks
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results = collection.get(
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where={"full_doc_id": file_id},
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include=["documents", "metadatas"]
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)
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# 构建chunks数据
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doc_chunks = []
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if results and results.get("ids"):
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for i, chunk_id in enumerate(results["ids"]):
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chunk_data = {
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"id": chunk_id,
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"content": results["documents"][i] if i < len(results["documents"]) else "",
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"metadata": results["metadatas"][i] if i < len(results["metadatas"]) else {},
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"chunk_order_index": results["metadatas"][i].get("chunk_index", i) if i < len(results["metadatas"]) else i
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}
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doc_chunks.append(chunk_data)
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# 按 chunk_order_index 排序
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doc_chunks.sort(key=lambda x: x.get("chunk_order_index", 0))
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return {"lines": doc_chunks}
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except Exception as e:
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logger.error(f"Error getting chunks for file {file_id}: {e}")
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return {"lines": []} |