dsProject/dsLightRag/StartMath.py

import json
import logging
import os
import warnings
from logging.handlers import RotatingFileHandler

import fastapi
import uvicorn
from fastapi import FastAPI
from sse_starlette import EventSourceResponse
from starlette.staticfiles import StaticFiles

from Util.LightRagUtil import initialize_rag
from lightrag import QueryParam

# 初始化日志
logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

# 配置日志处理器
log_file = os.path.join(os.path.dirname(__file__), 'Logs', 'app.log')
os.makedirs(os.path.dirname(log_file), exist_ok=True)

# 文件处理器
file_handler = RotatingFileHandler(
    log_file, maxBytes=1024 * 1024, backupCount=5, encoding='utf-8')
file_handler.setFormatter(logging.Formatter(
    '%(asctime)s - %(name)s - %(levelname)s - %(message)s'))

# 控制台处理器
console_handler = logging.StreamHandler()
console_handler.setFormatter(logging.Formatter(
    '%(asctime)s - %(name)s - %(levelname)s - %(message)s'))

logger.addHandler(file_handler)
logger.addHandler(console_handler)


async def lifespan(app: FastAPI):
    # 抑制HTTPS相关警告
    warnings.filterwarnings('ignore', message='Connecting to .* using TLS with verify_certs=False is insecure')
    warnings.filterwarnings('ignore', message='Unverified HTTPS request is being made to host')
    
    # 初始化RAG
    app.state.rag = await initialize_rag(working_dir="./Test/Math")
    yield
    
    # 清理资源
    await app.state.rag.finalize_storages()


async def print_stream(stream):
    async for chunk in stream:
        if chunk:
            print(chunk, end="", flush=True)


app = FastAPI(lifespan=lifespan)

# 挂载静态文件目录
app.mount("/static", StaticFiles(directory="Static"), name="static")


@app.post("/api/rag")
async def rag(request: fastapi.Request):
    data = await request.json()
    query = data.get("query")

    async def generate_response_stream(query: str):
        try:
            resp = await request.app.state.rag.aquery(
                query=query,
                param=QueryParam(mode="hybrid", stream=True))

            async for chunk in resp:
                if not chunk:
                    continue
                yield f"data: {json.dumps({'reply': chunk})}\n\n"
                print(chunk, end='', flush=True)
        except Exception as e:
            yield f"data: {json.dumps({'error': str(e)})}\n\n"

    return EventSourceResponse(generate_response_stream(query=query))


if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)