485 lines
16 KiB
Python
485 lines
16 KiB
Python
"""Milvus向量数据库客户端 - 存储与检索服务"""
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from pymilvus import (
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connections,
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Collection,
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FieldSchema,
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CollectionSchema,
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DataType,
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utility
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)
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from typing import List, Dict, Optional, Any
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from dataclasses import dataclass, field
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from loguru import logger
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import time
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import numpy as np
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from ..embedding.text_chunker import TextChunk
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from ..embedding.bge_m3_embedder import EmbeddingResult
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from app.config.settings import settings
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@dataclass
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class SearchResult:
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"""检索结果"""
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id: int
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content: str
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score: float
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metadata: Dict[str, Any] = field(default_factory=dict)
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@dataclass
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class MilvusDocument:
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"""Milvus文档数据结构"""
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doc_id: str
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chunk_id: str
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content: str
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dense_vector: List[float]
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sparse_vector: Dict[int, float]
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doc_name: str
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section_title: str
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clause_number: str
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page_number: int
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regulation_type: str
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version: str
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create_time: int
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class MilvusClient:
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"""Milvus向量数据库客户端"""
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COLLECTION_NAME = "regulations"
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SCHEMA_FIELDS = [
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FieldSchema(name="id", dtype=DataType.INT64, is_primary=True, auto_id=True),
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FieldSchema(name="doc_id", dtype=DataType.VARCHAR, max_length=64),
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FieldSchema(name="chunk_id", dtype=DataType.VARCHAR, max_length=128),
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FieldSchema(name="content", dtype=DataType.VARCHAR, max_length=8192),
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FieldSchema(name="dense_vector", dtype=DataType.FLOAT_VECTOR, dim=1024),
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FieldSchema(name="sparse_vector", dtype=DataType.SPARSE_FLOAT_VECTOR),
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FieldSchema(name="doc_name", dtype=DataType.VARCHAR, max_length=256),
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FieldSchema(name="section_title", dtype=DataType.VARCHAR, max_length=512),
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FieldSchema(name="clause_number", dtype=DataType.VARCHAR, max_length=64),
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FieldSchema(name="page_number", dtype=DataType.INT64),
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FieldSchema(name="regulation_type", dtype=DataType.VARCHAR, max_length=32),
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FieldSchema(name="version", dtype=DataType.VARCHAR, max_length=32),
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FieldSchema(name="create_time", dtype=DataType.INT64),
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]
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def __init__(
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self,
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host: str = None,
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port: int = None,
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collection_name: str = None,
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db_name: str = None
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):
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self.host = host or settings.milvus_host
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self.port = port or settings.milvus_port
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self.collection_name = collection_name or settings.milvus_collection
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self.db_name = db_name or settings.milvus_db_name
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self.collection: Optional[Collection] = None
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self.connected = False
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logger.info(f"Milvus客户端配置: {self.host}:{self.port}, Collection: {self.collection_name}")
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def connect(self) -> bool:
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"""连接到Milvus服务器"""
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try:
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connections.connect(
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alias="default",
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host=self.host,
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port=self.port,
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db_name=self.db_name
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)
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self.connected = True
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logger.success(f"Milvus连接成功: {self.host}:{self.port}")
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return True
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except Exception as e:
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logger.error(f"Milvus连接失败: {e}")
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self.connected = False
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return False
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def disconnect(self):
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"""断开连接"""
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try:
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connections.disconnect("default")
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self.connected = False
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logger.info("Milvus连接已断开")
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except Exception as e:
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logger.warning(f"断开连接时出错: {e}")
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def create_collection(self, recreate: bool = False) -> bool:
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"""创建Collection"""
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if not self.connected:
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logger.warning("未连接到Milvus，请先调用connect()")
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return False
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try:
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if utility.has_collection(self.collection_name):
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if recreate:
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logger.info(f"删除已存在的Collection: {self.collection_name}")
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utility.drop_collection(self.collection_name)
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else:
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logger.info(f"Collection已存在: {self.collection_name}")
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self.collection = Collection(self.collection_name)
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return True
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schema = CollectionSchema(
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fields=self.SCHEMA_FIELDS,
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description="法规文档向量存储",
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enable_dynamic_field=True
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)
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self.collection = Collection(
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name=self.collection_name,
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schema=schema
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)
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self._create_indexes()
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logger.success(f"Collection创建成功: {self.collection_name}")
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return True
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except Exception as e:
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logger.error(f"Collection创建失败: {e}")
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return False
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def _create_indexes(self):
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"""创建向量索引"""
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if not self.collection:
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return
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try:
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dense_index_params = {
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"metric_type": "COSINE",
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"index_type": "IVF_FLAT",
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"params": {"nlist": 128}
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}
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self.collection.create_index(
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field_name="dense_vector",
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index_params=dense_index_params
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)
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sparse_index_params = {
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"metric_type": "IP",
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"index_type": "SPARSE_INVERTED_INDEX",
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"params": {"drop_ratio_build": 0.2}
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}
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self.collection.create_index(
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field_name="sparse_vector",
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index_params=sparse_index_params
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)
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logger.success("向量索引创建成功")
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except Exception as e:
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logger.warning(f"创建索引时出错: {e}")
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def load_collection(self):
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"""加载Collection到内存"""
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if self.collection:
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self.collection.load()
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logger.info(f"Collection已加载: {self.collection_name}")
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def release_collection(self):
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"""释放Collection内存"""
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if self.collection:
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self.collection.release()
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logger.info(f"Collection已释放: {self.collection_name}")
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def insert_chunks(
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self,
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chunks: List[TextChunk],
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embeddings: EmbeddingResult
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) -> List[int]:
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"""插入文档分块和嵌入向量"""
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if not self.collection:
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logger.warning("Collection未初始化")
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return []
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if len(chunks) != len(embeddings.texts):
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logger.warning(f"Chunks数量与嵌入数量不匹配")
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return []
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logger.info(f"准备插入{len(chunks)}个文档分块")
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try:
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data = []
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current_time = int(time.time())
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for chunk, dense_emb, sparse_emb in zip(
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chunks,
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embeddings.dense_embeddings,
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embeddings.sparse_embeddings
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):
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row = {
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"doc_id": chunk.metadata.doc_id,
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"chunk_id": chunk.metadata.chunk_id,
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"content": chunk.content,
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"dense_vector": dense_emb.tolist(),
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"sparse_vector": sparse_emb,
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"doc_name": chunk.metadata.doc_name,
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"section_title": chunk.metadata.section_title,
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"clause_number": chunk.metadata.clause_number,
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"page_number": chunk.metadata.page_number,
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"regulation_type": chunk.metadata.regulation_type,
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"version": chunk.metadata.version,
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"create_time": current_time
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}
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data.append(row)
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result = self.collection.insert(data)
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self.collection.flush()
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logger.success(f"插入完成，共{len(result.primary_keys)}条记录")
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return result.primary_keys
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except Exception as e:
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logger.error(f"插入数据失败: {e}")
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return []
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def hybrid_search(
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self,
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query_dense: List[float],
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query_sparse: Dict[int, float],
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top_k: int = 10,
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filters: Optional[str] = None
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) -> List[SearchResult]:
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"""混合检索：Dense + Sparse"""
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if not self.collection:
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logger.warning("Collection未初始化")
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return []
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try:
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self.collection.load()
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# 使用简单的Dense检索（兼容所有版本）
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dense_results = self.dense_search(query_dense, top_k, filters)
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# 可选：合并Sparse结果
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if query_sparse:
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sparse_results = self.sparse_search(query_sparse, top_k, filters)
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merged = self._merge_results(dense_results, sparse_results, top_k)
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logger.success(f"混合检索完成，返回{len(merged)}条结果")
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return merged
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return dense_results
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except Exception as e:
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logger.error(f"混合检索失败: {e}")
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return []
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def _merge_results(
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self,
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dense_results: List[SearchResult],
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sparse_results: List[SearchResult],
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top_k: int,
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dense_weight: float = 0.6
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) -> List[SearchResult]:
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"""手动融合Dense和Sparse结果"""
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sparse_weight = 1 - dense_weight
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merged_dict = {}
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for r in dense_results:
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merged_dict[r.id] = {
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"result": r,
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"dense_score": r.score * dense_weight,
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"sparse_score": 0
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}
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for r in sparse_results:
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if r.id in merged_dict:
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merged_dict[r.id]["sparse_score"] = r.score * sparse_weight
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else:
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merged_dict[r.id] = {
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"result": r,
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"dense_score": 0,
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"sparse_score": r.score * sparse_weight
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}
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final_results = []
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for id_, data in merged_dict.items():
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result = data["result"]
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final_score = data["dense_score"] + data["sparse_score"]
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final_results.append(SearchResult(
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id=result.id,
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content=result.content,
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score=final_score,
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metadata=result.metadata
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))
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final_results.sort(key=lambda x: x.score, reverse=True)
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return final_results[:top_k]
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def dense_search(
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self,
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query_dense: List[float],
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top_k: int = 10,
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filters: Optional[str] = None
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) -> List[SearchResult]:
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"""纯Dense向量检索"""
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if not self.collection:
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return []
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try:
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self.collection.load()
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search_params = {
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"metric_type": "COSINE",
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"params": {"nprobe": 16}
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}
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results = self.collection.search(
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data=[query_dense],
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anns_field="dense_vector",
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param=search_params,
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limit=top_k,
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filter=filters,
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output_fields=[
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"doc_id", "chunk_id", "content",
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"doc_name", "section_title", "clause_number",
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"page_number", "regulation_type", "version"
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]
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)
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search_results = []
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for hits in results:
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for hit in hits:
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result = SearchResult(
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id=hit.id,
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content=hit.entity.get("content", ""),
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score=hit.score,
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metadata={
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"doc_id": hit.entity.get("doc_id", ""),
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"chunk_id": hit.entity.get("chunk_id", ""),
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"doc_name": hit.entity.get("doc_name", ""),
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"section_title": hit.entity.get("section_title", ""),
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"clause_number": hit.entity.get("clause_number", ""),
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"page_number": hit.entity.get("page_number", 0),
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"regulation_type": hit.entity.get("regulation_type", ""),
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"version": hit.entity.get("version", ""),
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}
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)
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search_results.append(result)
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return search_results
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except Exception as e:
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logger.error(f"Dense检索失败: {e}")
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return []
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def sparse_search(
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self,
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query_sparse: Dict[int, float],
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top_k: int = 10,
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filters: Optional[str] = None
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) -> List[SearchResult]:
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"""纯Sparse向量检索"""
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if not self.collection:
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return []
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try:
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self.collection.load()
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search_params = {
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"metric_type": "IP",
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"params": {"drop_ratio_search": 0.2}
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}
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results = self.collection.search(
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data=[query_sparse],
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anns_field="sparse_vector",
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param=search_params,
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limit=top_k,
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filter=filters,
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output_fields=[
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"doc_id", "chunk_id", "content",
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"doc_name", "section_title", "clause_number",
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"page_number", "regulation_type", "version"
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]
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)
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search_results = []
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for hits in results:
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for hit in hits:
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result = SearchResult(
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id=hit.id,
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content=hit.entity.get("content", ""),
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score=hit.score,
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metadata={
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"doc_id": hit.entity.get("doc_id", ""),
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"chunk_id": hit.entity.get("chunk_id", ""),
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"doc_name": hit.entity.get("doc_name", ""),
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"section_title": hit.entity.get("section_title", ""),
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"clause_number": hit.entity.get("clause_number", ""),
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"page_number": hit.entity.get("page_number", 0),
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"regulation_type": hit.entity.get("regulation_type", ""),
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"version": hit.entity.get("version", ""),
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}
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)
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search_results.append(result)
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return search_results
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except Exception as e:
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logger.error(f"Sparse检索失败: {e}")
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return []
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def delete_by_doc_id(self, doc_id: str) -> int:
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"""根据doc_id删除记录"""
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if not self.collection:
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return 0
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try:
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expr = f'doc_id=="{doc_id}"'
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result = self.collection.delete(expr)
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logger.info(f"删除记录: doc_id={doc_id}, 数量={len(result.primary_keys)}")
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return len(result.primary_keys)
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except Exception as e:
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logger.error(f"删除失败: {e}")
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return 0
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def get_collection_stats(self) -> Dict[str, Any]:
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"""获取Collection统计信息"""
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if not self.collection:
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return {}
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try:
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stats = {
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"name": self.collection_name,
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"num_entities": self.collection.num_entities,
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"description": self.collection.description,
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}
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return stats
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except Exception as e:
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logger.warning(f"获取统计信息失败: {e}")
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return {}
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def create_milvus_client() -> MilvusClient:
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"""便捷函数：创建Milvus客户端"""
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client = MilvusClient()
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client.connect()
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client.create_collection(recreate=False)
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return client
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def insert_documents(
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client: MilvusClient,
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chunks: List[TextChunk],
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embeddings: EmbeddingResult
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) -> List[int]:
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"""便捷函数：插入文档"""
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return client.insert_chunks(chunks, embeddings)
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def search_regulations(
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client: MilvusClient,
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query_dense: List[float],
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query_sparse: Dict[int, float],
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top_k: int = 10
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) -> List[SearchResult]:
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"""便捷函数：检索法规"""
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return client.hybrid_search(query_dense, query_sparse, top_k)
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