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"""
FastAPI + React 18 单文件全栈应用
专为 Kaggle/Colab 环境设计，展示企业级前后端分离架构
功能特点：
1. 后端：FastAPI (异步、高性能、自动文档)
2. 前端：React 18 + Tailwind CSS (现代化UI、组件化)
3. 部署：单文件运行，自动处理静态资源，支持 ngrok 穿透
使用方法：
python server.py
"""
import os
import sys
import uvicorn
from fastapi import FastAPI, UploadFile, File, HTTPException
from fastapi.responses import HTMLResponse
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from typing import List, Optional
import shutil
# 导入项目核心模块
# 确保项目根目录在 sys.path 中
sys.path.append(os.getcwd())
try:
from config import ENABLE_MULTIMODAL
except Exception:
ENABLE_MULTIMODAL = False
# ============================================================
# 1. FastAPI 后端定义
# ============================================================
app = FastAPI(
title="Adaptive RAG Enterprise API",
description="基于 FastAPI 和 React 构建的企业级 RAG 系统演示",
version="1.0.0"
)
# 允许跨域 (虽然单体部署不需要，但为了开发规范加上)
app.add_middleware(
CORSMiddleware,
allow_origins=["*"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)
# 全局 RAG 系统实例
rag_system = None
def get_rag_system():
global rag_system
if rag_system is None:
try:
print("🔄 初始化 RAG 系统...")
from main import AdaptiveRAGSystem
rag_system = AdaptiveRAGSystem()
print("✅ RAG 系统初始化完成")
except Exception as e:
print(f"❌ RAG 系统初始化失败: {e}")
raise HTTPException(status_code=500, detail=str(e))
return rag_system
# --- 数据模型 ---
class ChatRequest(BaseModel):
message: str
history: List[dict] = []
class ChatResponse(BaseModel):
answer: str
sources: List[str] = []
metrics: Optional[dict] = None
images: List[str] = []
# --- API 路由 ---
@app.get("/api/health")
async def health_check():
"""健康检查接口"""
return {"status": "ok", "service": "Adaptive RAG", "multimodal": ENABLE_MULTIMODAL}
@app.post("/api/chat", response_model=ChatResponse)
async def chat_endpoint(request: ChatRequest):
"""聊天接口"""
system = get_rag_system()
try:
# 调用 RAG 系统的主查询方法
# 注意：这里假设 main.py 中的 AdaptiveRAGSystem 有 query 方法
# 如果是 main_graphrag.py，可能需要调整调用逻辑
result = system.query(request.message)
# 解析结果
answer = result.get("answer", "无法生成回答")
sources = [doc.page_content[:200] + "..." for doc in result.get("source_documents", [])]
metrics = result.get("retrieval_metrics", {})
# 处理多模态图片结果 (如果有)
images = []
if ENABLE_MULTIMODAL and "images" in result:
# 这里简化处理，实际可能需要返回图片URL或Base64
images = result["images"]
return ChatResponse(
answer=answer,
sources=sources,
metrics=metrics,
images=images
)
except Exception as e:
import traceback
traceback.print_exc()
raise HTTPException(status_code=500, detail=f"处理请求时出错: {str(e)}")
@app.post("/api/upload")
async def upload_file(file: UploadFile = File(...)):
"""文件上传接口"""
try:
# 确保上传目录存在
upload_dir = "./data/uploads"
os.makedirs(upload_dir, exist_ok=True)
file_path = os.path.join(upload_dir, file.filename)
with open(file_path, "wb") as buffer:
shutil.copyfileobj(file.file, buffer)
return {"filename": file.filename, "status": "success", "message": "文件上传成功，将在下次索引重建时生效"}
except Exception as e:
raise HTTPException(status_code=500, detail=f"文件上传失败: {str(e)}")
# ============================================================
# 2. 前端 React 应用 (嵌入在 Python 字符串中)
# ============================================================
HTML_CONTENT = """
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Enterprise RAG System (React)</title>
<!-- 引入 React 和 ReactDOM -->
<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
<!-- 引入 Babel 用于解析 JSX -->
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<!-- 引入 Tailwind CSS -->
<script src="https://cdn.tailwindcss.com"></script>
<!-- 引入 Markdown 渲染库 -->
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<!-- 引入 FontAwesome 图标 -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<style>
.markdown-body p { margin-bottom: 0.5rem; }
.markdown-body ul { list-style-type: disc; margin-left: 1.5rem; }
.markdown-body ol { list-style-type: decimal; margin-left: 1.5rem; }
.markdown-body pre { background-color: #f3f4f6; padding: 1rem; border-radius: 0.5rem; overflow-x: auto; }
.markdown-body code { background-color: #f3f4f6; padding: 0.2rem 0.4rem; border-radius: 0.25rem; font-family: monospace; }
/* 自定义滚动条 */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #f1f1f1; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
.typing-indicator span {
display: inline-block;
width: 6px;
height: 6px;
background-color: #94a3b8;
border-radius: 50%;
animation: typing 1.4s infinite ease-in-out both;
margin: 0 2px;
}
.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
@keyframes typing {
0%, 80%, 100% { transform: scale(0); }
40% { transform: scale(1); }
}
</style>
</head>
<body class="bg-slate-50 h-screen flex flex-col font-sans text-slate-800">
<div id="root" class="h-full w-full"></div>
<script type="text/babel">
const { useState, useEffect, useRef } = React;
function App() {
const [messages, setMessages] = useState([]);
const [inputMessage, setInputMessage] = useState('');
const [loading, setLoading] = useState(false);
const [sidebarOpen, setSidebarOpen] = useState(true);
const [showSources, setShowSources] = useState(true);
const [showMetrics, setShowMetrics] = useState(false);
const [multimodalEnabled, setMultimodalEnabled] = useState(false);
const [uploadStatus, setUploadStatus] = useState(null);
const chatContainerRef = useRef(null);
const fileInputRef = useRef(null);
// 初始化检查健康状态
useEffect(() => {
fetch('/api/health')
.then(res => res.json())
.then(data => setMultimodalEnabled(data.multimodal))
.catch(err => console.error("无法连接到后端", err));
}, []);
// 自动滚动到底部
useEffect(() => {
if (chatContainerRef.current) {
chatContainerRef.current.scrollTop = chatContainerRef.current.scrollHeight;
}
}, [messages, loading]);
const sendMessage = async () => {
if (!inputMessage.trim() || loading) return;
const userMsg = inputMessage.trim();
setMessages(prev => [...prev, { role: 'user', content: userMsg }]);
setInputMessage('');
setLoading(true);
try {
const response = await fetch('/api/chat', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({ message: userMsg })
});
if (!response.ok) throw new Error('API request failed');
const data = await response.json();
setMessages(prev => [...prev, {
role: 'assistant',
content: data.answer,
sources: data.sources,
metrics: data.metrics,
images: data.images
}]);
} catch (error) {
setMessages(prev => [...prev, {
role: 'assistant',
content: '⚠️ 系统遇到错误，请稍后重试。'
}]);
console.error(error);
} finally {
setLoading(false);
}
};
const handleFileUpload = async (event) => {
const file = event.target.files[0];
if (!file) return;
const formData = new FormData();
formData.append('file', file);
setUploadStatus({ type: 'info', message: '正在上传...' });
try {
const response = await fetch('/api/upload', {
method: 'POST',
body: formData
});
if (response.ok) {
setUploadStatus({ type: 'success', message: '上传成功！' });
} else {
throw new Error('Upload failed');
}
} catch (error) {
setUploadStatus({ type: 'error', message: '上传失败' });
}
setTimeout(() => setUploadStatus(null), 3000);
};
const handleKeyDown = (e) => {
if (e.key === 'Enter' && !e.shiftKey) {
e.preventDefault();
sendMessage();
}
};
return (
<div className="flex h-full max-w-7xl mx-auto w-full shadow-2xl bg-white overflow-hidden">
{/* 左侧侧边栏 */}
<div className={`bg-slate-900 text-white flex flex-col flex-shrink-0 transition-all duration-300 ${sidebarOpen ? 'w-64' : 'w-0'}`}>
<div className="p-4 border-b border-slate-700 flex items-center justify-between">
<div className="flex items-center space-x-2 font-bold text-xl overflow-hidden whitespace-nowrap">
<i className="fa-solid fa-brain text-blue-400"></i>
<span>Adaptive RAG</span>
</div>
</div>
<div className="flex-1 overflow-y-auto p-4 space-y-6">
{/* 系统状态 */}
<div>
<h3 className="text-xs font-semibold text-slate-400 uppercase tracking-wider mb-2">系统状态</h3>
<div className="flex items-center space-x-2 text-sm">
<span className="w-2 h-2 rounded-full bg-green-500"></span>
<span>API 服务正常</span>
</div>
<div className="flex items-center space-x-2 text-sm mt-1">
<span className={`w-2 h-2 rounded-full ${multimodalEnabled ? 'bg-green-500' : 'bg-gray-500'}`}></span>
<span>多模态支持: {multimodalEnabled ? '开启' : '关闭'}</span>
</div>
</div>
{/* 知识库管理 */}
<div>
<h3 className="text-xs font-semibold text-slate-400 uppercase tracking-wider mb-2">知识库管理</h3>
<div
className="bg-slate-800 rounded-lg p-3 text-center border border-dashed border-slate-600 hover:border-blue-400 transition-colors cursor-pointer"
onClick={() => fileInputRef.current.click()}
>
<input
type="file"
ref={fileInputRef}
className="hidden"
onChange={handleFileUpload}
/>
<i className="fa-solid fa-cloud-arrow-up text-2xl text-slate-400 mb-2"></i>
<p className="text-xs text-slate-300">点击上传 PDF/图片</p>
</div>
{uploadStatus && (
<p className={`text-xs mt-2 text-center ${uploadStatus.type === 'success' ? 'text-green-400' : 'text-red-400'}`}>
{uploadStatus.message}
</p>
)}
</div>
{/* 设置 */}
<div>
<h3 className="text-xs font-semibold text-slate-400 uppercase tracking-wider mb-2">设置</h3>
<div className="flex items-center justify-between text-sm py-1">
<span>显示检索源</span>
<button
className={`w-8 h-4 rounded-full relative transition-colors ${showSources ? 'bg-blue-600' : 'bg-slate-700'}`}
onClick={() => setShowSources(!showSources)}
>
<span className={`absolute top-0.5 left-0.5 w-3 h-3 bg-white rounded-full transition-transform ${showSources ? 'translate-x-4' : ''}`}></span>
</button>
</div>
<div className="flex items-center justify-between text-sm py-1">
<span>显示指标</span>
<button
className={`w-8 h-4 rounded-full relative transition-colors ${showMetrics ? 'bg-blue-600' : 'bg-slate-700'}`}
onClick={() => setShowMetrics(!showMetrics)}
>
<span className={`absolute top-0.5 left-0.5 w-3 h-3 bg-white rounded-full transition-transform ${showMetrics ? 'translate-x-4' : ''}`}></span>
</button>
</div>
</div>
</div>
<div className="p-4 border-t border-slate-700 text-xs text-slate-500 text-center">
Enterprise Edition v1.0
</div>
</div>
{/* 主聊天区域 */}
<div className="flex-1 flex flex-col h-full bg-slate-50 relative">
{/* 顶部导航栏 */}
<div className="h-16 bg-white border-b border-slate-200 flex items-center justify-between px-6 shadow-sm z-10">
<div className="flex items-center">
<button onClick={() => setSidebarOpen(!sidebarOpen)} className="text-slate-500 hover:text-slate-700 focus:outline-none mr-4">
<i className="fa-solid fa-bars text-xl"></i>
</button>
<h1 className="text-lg font-semibold text-slate-700">智能知识库助手 (React版)</h1>
</div>
<div className="flex items-center space-x-4">
<a href="/docs" target="_blank" className="text-sm text-blue-600 hover:text-blue-800 font-medium">
<i className="fa-solid fa-book-open mr-1"></i> API 文档
</a>
</div>
</div>
{/* 聊天记录 */}
<div className="flex-1 overflow-y-auto p-6 space-y-6 scroll-smooth" ref={chatContainerRef}>
{messages.length === 0 && (
<div className="flex flex-col items-center justify-center h-full text-center space-y-4 opacity-50">
<div className="w-20 h-20 bg-blue-100 rounded-full flex items-center justify-center text-blue-500 text-4xl mb-4">
<i className="fa-solid fa-robot"></i>
</div>
<h2 className="text-2xl font-bold text-slate-700">有什么可以帮您？</h2>
<p className="text-slate-500 max-w-md">我可以回答关于知识库的问题，支持多模态检索和图谱分析。</p>
<div className="grid grid-cols-2 gap-4 mt-8 w-full max-w-lg">
<button onClick={() => setInputMessage('GraphRAG 的核心原理是什么？')} className="p-4 bg-white border border-slate-200 rounded-xl hover:border-blue-400 hover:shadow-md transition-all text-left text-sm">
GraphRAG 的核心原理是什么？
</button>
<button onClick={() => setInputMessage('分析这些文档的主要主题')} className="p-4 bg-white border border-slate-200 rounded-xl hover:border-blue-400 hover:shadow-md transition-all text-left text-sm">
分析这些文档的主要主题
</button>
</div>
</div>
)}
{messages.map((msg, index) => (
<div key={index} className={`flex flex-col space-y-2 ${msg.role === 'user' ? 'items-end' : 'items-start'}`}>
{msg.role === 'user' ? (
<div className="flex items-end space-x-2 max-w-[80%]">
<div className="bg-blue-600 text-white px-5 py-3 rounded-2xl rounded-tr-none shadow-md">
{msg.content}
</div>
<div className="w-8 h-8 rounded-full bg-slate-200 flex items-center justify-center text-slate-500 flex-shrink-0">
<i className="fa-solid fa-user"></i>
</div>
</div>
) : (
<div className="flex items-start space-x-3 max-w-[90%] w-full">
<div className="w-8 h-8 rounded-full bg-green-100 flex items-center justify-center text-green-600 flex-shrink-0 mt-1">
<i className="fa-solid fa-robot"></i>
</div>
<div className="flex flex-col space-y-2 w-full">
<div
className="bg-white border border-slate-200 px-6 py-4 rounded-2xl rounded-tl-none shadow-sm w-full markdown-body"
dangerouslySetInnerHTML={{ __html: marked.parse(msg.content) }}
></div>
{showSources && msg.sources && msg.sources.length > 0 && (
<div className="bg-slate-50 border border-slate-200 rounded-xl p-3 text-xs text-slate-600 mt-2">
<div className="font-semibold mb-2 flex items-center text-slate-400">
<i className="fa-solid fa-quote-left mr-2"></i> 参考来源
</div>
{msg.sources.map((source, idx) => (
<div key={idx} className="mb-2 last:mb-0 pl-3 border-l-2 border-blue-300">
{source}
</div>
))}
</div>
)}
{showMetrics && msg.metrics && (
<div className="flex flex-wrap gap-2 mt-1">
<span className="px-2 py-1 bg-slate-100 rounded text-xs text-slate-500 border border-slate-200">
<i className="fa-solid fa-clock mr-1"></i> {msg.metrics.latency ? msg.metrics.latency.toFixed(3) : 0}s
</span>
<span className="px-2 py-1 bg-slate-100 rounded text-xs text-slate-500 border border-slate-200">
<i className="fa-solid fa-file-lines mr-1"></i> Docs: {msg.metrics.retrieved_docs_count || 0}
</span>
</div>
)}
</div>
</div>
)}
</div>
))}
{loading && (
<div className="flex items-start space-x-3">
<div className="w-8 h-8 rounded-full bg-green-100 flex items-center justify-center text-green-600 flex-shrink-0 mt-1">
<i className="fa-solid fa-robot"></i>
</div>
<div className="bg-white border border-slate-200 px-5 py-3 rounded-2xl rounded-tl-none shadow-sm">
<div className="typing-indicator">
<span></span><span></span><span></span>
</div>
</div>
</div>
)}
</div>
{/* 输入区域 */}
<div className="bg-white p-4 border-t border-slate-200">
<div className="max-w-4xl mx-auto relative">
<textarea
value={inputMessage}
onChange={(e) => setInputMessage(e.target.value)}
onKeyDown={handleKeyDown}
placeholder="输入您的问题... (Shift + Enter 换行)"
className="w-full pl-4 pr-12 py-3 bg-slate-50 border border-slate-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent resize-none shadow-inner text-sm"
rows="2"
></textarea>
<button
onClick={sendMessage}
disabled={loading || !inputMessage.trim()}
className="absolute right-2 bottom-2.5 p-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors shadow-md"
>
<i className="fa-solid fa-paper-plane"></i>
</button>
</div>
<div className="text-center mt-2 text-xs text-slate-400">
Powered by Adaptive RAG & FastAPI & React
</div>
</div>
</div>
</div>
);
}
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(<App />);
</script>
</body>
</html>
"""
@app.get("/", response_class=HTMLResponse)
async def read_root():
"""返回单页应用前端"""
return HTMLResponse(content=HTML_CONTENT)
if __name__ == "__main__":
print("="*60)
print("🚀 企业级 RAG 服务器启动中...")
print(" 后端: FastAPI")
print(" 前端: Vue 3 + Tailwind")
print(" 地址: http://0.0.0.0:8000")
print(" 文档: http://0.0.0.0:8000/docs")
print("="*60)
uvicorn.run(app, host="0.0.0.0", port=8000)
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