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import os
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import uuid
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import time
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import jieba
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from fastapi import FastAPI, Form, HTTPException
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from openai import OpenAI
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from gensim.models import KeyedVectors
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from contextlib import asynccontextmanager
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from TtsConfig import *
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from WxMini.OssUtil import upload_mp3_to_oss
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from WxMini.TtsUtil import TTS
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from WxMini.Milvus.Utils.MilvusCollectionManager import MilvusCollectionManager
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from WxMini.Milvus.Utils.MilvusConnectionPool import *
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from WxMini.Milvus.Config.MulvusConfig import *
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import jieba.analyse
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# 提取用户输入的关键词
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def extract_keywords(text, topK=3):
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"""
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提取用户输入的关键词
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:param text: 用户输入的文本
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:param topK: 返回的关键词数量
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:return: 关键词列表
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"""
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keywords = jieba.analyse.extract_tags(text, topK=topK)
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return keywords
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# 构建查询条件
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def build_query_expr(session_id, keywords):
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"""
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构建查询条件
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:param session_id: 用户会话 ID
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:param keywords: 关键词列表
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:return: 查询条件表达式
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"""
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# 基础条件：过滤 session_id
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expr = f"session_id == '{session_id}'"
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# 添加关键词条件
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if keywords:
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keyword_conditions = []
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for keyword in keywords:
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if len(keyword) > 1: # 过滤过短的关键词
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# 使用前缀匹配
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keyword_conditions.append(f"user_input like '{keyword}%'")
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if keyword_conditions:
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expr += " and (" + " or ".join(keyword_conditions) + ")"
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return expr
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# 初始化 Word2Vec 模型
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model_path = MS_MODEL_PATH
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model = KeyedVectors.load_word2vec_format(model_path, binary=False, limit=MS_MODEL_LIMIT)
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print(f"模型加载成功，词向量维度: {model.vector_size}")
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# 初始化 Milvus 连接池
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milvus_pool = MilvusConnectionPool(host=MS_HOST, port=MS_PORT, max_connections=MS_MAX_CONNECTIONS)
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# 初始化集合管理器
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collection_name = MS_COLLECTION_NAME
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collection_manager = MilvusCollectionManager(collection_name)
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# 将文本转换为嵌入向量
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def text_to_embedding(text):
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words = jieba.lcut(text) # 使用 jieba 分词
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print(f"文本: {text}, 分词结果: {words}")
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embeddings = [model[word] for word in words if word in model]
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print(f"有效词向量数量: {len(embeddings)}")
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if embeddings:
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avg_embedding = sum(embeddings) / len(embeddings)
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print(f"生成的平均向量: {avg_embedding[:5]}...") # 打印前 5 维
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return avg_embedding
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else:
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print("未找到有效词，返回零向量")
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return [0.0] * model.vector_size
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# 使用 Lifespan Events 处理应用启动和关闭逻辑
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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# 应用启动时加载集合到内存
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collection_manager.load_collection()
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print(f"集合 '{collection_name}' 已加载到内存。")
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yield
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# 应用关闭时释放连接池
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milvus_pool.close()
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print("Milvus 连接池已关闭。")
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# 初始化 FastAPI 应用
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app = FastAPI(lifespan=lifespan)
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# 初始化 OpenAI 客户端
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client = OpenAI(
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api_key=MODEL_API_KEY,
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base_url="https://dashscope.aliyuncs.com/compatible-mode/v1",
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)
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# 设置相似度阈值
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SIMILARITY_THRESHOLD = 0.5 # 距离小于 0.5 的结果被认为是高相似度
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@app.post("/reply")
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async def reply(session_id: str = Form(...), prompt: str = Form(...)):
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"""
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接收用户输入的 prompt，调用大模型并返回结果
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:param session_id: 用户会话 ID
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:param prompt: 用户输入的 prompt
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:return: 大模型的回复
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"""
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try:
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# 从连接池中获取一个连接
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connection = milvus_pool.get_connection()
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# 将用户输入转换为嵌入向量
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current_embedding = text_to_embedding(prompt)
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# 提取用户输入的关键词
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keywords = extract_keywords(prompt)
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print(f"提取的关键词: {keywords}")
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# 构建查询条件
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expr = build_query_expr(session_id, keywords)
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print(f"查询条件: {expr}")
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# 查询与当前对话最相关的五条历史交互
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search_params = {
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"metric_type": "L2", # 使用 L2 距离度量方式
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"params": {"nprobe": MS_NPROBE} # 设置 IVF_FLAT 的 nprobe 参数
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}
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start_time = time.time()
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results = collection_manager.search(
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data=current_embedding, # 输入向量
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search_params=search_params, # 搜索参数
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expr=expr, # 查询条件
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limit=5 # 返回 5 条结果
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)
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end_time = time.time()
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# 构建历史交互提示词
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history_prompt = ""
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if results:
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for hits in results:
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for hit in hits:
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try:
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# 过滤低相似度的结果
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if hit.distance > SIMILARITY_THRESHOLD:
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print(f"跳过低相似度结果，距离: {hit.distance}")
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continue
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# 查询非向量字段
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record = collection_manager.query_by_id(hit.id)
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if record:
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print(f"查询到的记录: {record}")
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# 只添加与当前问题高度相关的历史交互
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if any(keyword in record['user_input'] for keyword in keywords):
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history_prompt += f"用户: {record['user_input']}\n大模型: {record['model_response']}\n"
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except Exception as e:
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print(f"查询失败: {e}")
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print(f"历史交互提示词: {history_prompt}")
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# 调用大模型，将历史交互作为提示词
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response = client.chat.completions.create(
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model=MODEL_NAME,
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messages=[
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{"role": "system", "content": "你是一个私人助理，负责回答用户的问题。请根据用户的历史对话和当前问题，提供准确且简洁的回答。不要提及你是通义千问或其他无关信息。"},
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{"role": "user", "content": f"{history_prompt}用户: {prompt}"} # 将历史交互和当前输入一起发送
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],
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max_tokens=500
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)
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# 提取生成的回复
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if response.choices and response.choices[0].message.content:
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result = response.choices[0].message.content.strip()
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# 记录用户输入和大模型反馈到向量数据库
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timestamp = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
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entities = [
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[session_id], # session_id
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[prompt], # user_input
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[result], # model_response
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[timestamp], # timestamp
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[current_embedding] # embedding
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]
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collection_manager.insert_data(entities)
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print("用户输入和大模型反馈已记录到向量数据库。")
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# 调用 TTS 生成 MP3
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uuid_str = str(uuid.uuid4())
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tts_file = "audio/" + uuid_str + ".mp3"
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t = TTS(tts_file)
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t.start(result)
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# 文件上传到 OSS
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upload_mp3_to_oss(tts_file, tts_file)
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# 删除临时文件
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try:
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os.remove(tts_file)
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print(f"临时文件 {tts_file} 已删除")
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except Exception as e:
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print(f"删除临时文件失败: {e}")
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# 完整的 URL
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url = 'https://ylt.oss-cn-hangzhou.aliyuncs.com/' + tts_file
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return {
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"success": True,
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"url": url,
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"search_time": end_time - start_time, # 返回查询耗时
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"response": result # 返回大模型的回复
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}
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else:
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raise HTTPException(status_code=500, detail="大模型未返回有效结果")
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except Exception as e:
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raise HTTPException(status_code=500, detail=f"调用大模型失败: {str(e)}")
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finally:
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# 释放连接
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milvus_pool.release_connection(connection)
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# 运行 FastAPI 应用
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if __name__ == "__main__":
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import uvicorn
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uvicorn.run(app, host="0.0.0.0", port=5600) |
