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import asyncio
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import json
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import logging
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import fastapi
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import uvicorn
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from fastapi import FastAPI
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from lightrag import LightRAG
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from lightrag.kg.shared_storage import initialize_pipeline_status
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from raganything import RAGAnything
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from sse_starlette import EventSourceResponse
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from starlette.staticfiles import StaticFiles
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from Util.RagUtil import create_llm_model_func, create_vision_model_func, create_embedding_func
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# 在程序开始时添加以下配置
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logging.basicConfig(
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level=logging.INFO, # 设置日志级别为INFO
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format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
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)
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# 或者如果你想更详细地控制日志输出
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logger = logging.getLogger('lightrag')
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logger.setLevel(logging.INFO)
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handler = logging.StreamHandler()
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handler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
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logger.addHandler(handler)
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async def lifespan(app: FastAPI):
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yield
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async def print_stream(stream):
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async for chunk in stream:
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if chunk:
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print(chunk, end="", flush=True)
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app = FastAPI(lifespan=lifespan)
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# 挂载静态文件目录
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app.mount("/static", StaticFiles(directory="Static"), name="static")
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@app.post("/api/rag")
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async def rag(request: fastapi.Request):
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data = await request.json()
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topic = data.get("topic") # Chinese, Math
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# 拼接路径
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WORKING_PATH= "./Topic/" + topic
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# 查询的问题
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query = data.get("query")
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# 关闭参考资料
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user_prompt="\n 1、不要输出参考资料 或者 References ！"
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user_prompt = user_prompt + "\n 2、如果问题与提供的知识库内容不符，则明确告诉未在知识库范围内提到！"
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async def generate_response_stream(query: str):
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try:
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# 初始化RAG组件
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llm_model_func = create_llm_model_func()
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vision_model_func = create_vision_model_func(llm_model_func)
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embedding_func = create_embedding_func()
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lightrag_instance = LightRAG(
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working_dir=WORKING_PATH,
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llm_model_func=llm_model_func,
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embedding_func=embedding_func
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)
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await lightrag_instance.initialize_storages()
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await initialize_pipeline_status()
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# 创建RAG实例并保存到app.state
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app.state.rag = RAGAnything(
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lightrag=lightrag_instance,
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vision_model_func=vision_model_func,
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)
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# 直接使用app.state中已初始化的rag实例
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# 修改为直接获取完整响应
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resp = await app.state.rag.aquery(
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query=query,
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mode="hybrid",
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stream=False # 改为False获取完整响应
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)
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# 将完整响应作为单个块返回
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#yield f"data: {json.dumps({'reply': resp})}\n\n"
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#print(resp, end='', flush=True)
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# 添加逐字输出效果
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for i in range(0, len(resp), 5): # 每次输出5个字符
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chunk = resp[i:i + 5]
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yield f"data: {json.dumps({'reply': chunk})}\n\n"
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await asyncio.sleep(0.1) # 控制输出速度
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except Exception as e:
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yield f"data: {json.dumps({'error': str(e)})}\n\n"
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logger.error(f"处理查询时出错: {query}. 错误: {str(e)}")
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finally:
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# 清理资源
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await app.state.rag.lightrag.finalize_storages()
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return EventSourceResponse(generate_response_stream(query=query))
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if __name__ == "__main__":
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uvicorn.run(app, host="0.0.0.0", port=8000)
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