fd13607366
使用 psycopg_pool 作为 LangGraph checkpointer 连接池，并在启动时执行 setup() 确保表存在；Windows 下切换为 SelectorEventLoopPolicy 以兼容 psycopg 异步模式。
146 lines
4.9 KiB
Python
146 lines
4.9 KiB
Python
import asyncio
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import os
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import sys
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# ==============================================================================
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# 解决 Windows 下 psycopg 异步模式不支持 ProactorEventLoop 的问题
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# 注意：这段代码必须放在应用的极早期，最好在导入 FastAPI 或初始化数据库之前
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# ==============================================================================
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if sys.platform == "win32":
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# 把当前文件 (main.py) 的上一级的上一级 (即根目录 Yuxi-Know) 加入到 sys.path
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
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from collections import defaultdict, deque
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import uvicorn
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from fastapi import FastAPI, Request, status
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import JSONResponse
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from starlette.middleware.base import BaseHTTPMiddleware
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from server.routers import router
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from server.utils.lifespan import lifespan
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from server.utils.auth_middleware import is_public_path
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from server.utils.common_utils import setup_logging
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from server.utils.access_log_middleware import AccessLogMiddleware
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# 设置日志配置
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setup_logging()
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RATE_LIMIT_MAX_ATTEMPTS = 10
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RATE_LIMIT_WINDOW_SECONDS = 60
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RATE_LIMIT_ENDPOINTS = {("/api/auth/token", "POST")}
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# In-memory login attempt tracker to reduce brute-force exposure per worker
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_login_attempts: defaultdict[str, deque[float]] = defaultdict(deque)
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_attempt_lock = asyncio.Lock()
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app = FastAPI(lifespan=lifespan)
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app.include_router(router, prefix="/api")
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# CORS 设置
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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def _extract_client_ip(request: Request) -> str:
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forwarded_for = request.headers.get("x-forwarded-for")
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if forwarded_for:
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return forwarded_for.split(",")[0].strip()
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if request.client:
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return request.client.host
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return "unknown"
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class LoginRateLimitMiddleware(BaseHTTPMiddleware):
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async def dispatch(self, request: Request, call_next):
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normalized_path = request.url.path.rstrip("/") or "/"
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request_signature = (normalized_path, request.method.upper())
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if request_signature in RATE_LIMIT_ENDPOINTS:
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client_ip = _extract_client_ip(request)
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now = time.monotonic()
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async with _attempt_lock:
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attempt_history = _login_attempts[client_ip]
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while attempt_history and now - attempt_history[0] > RATE_LIMIT_WINDOW_SECONDS:
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attempt_history.popleft()
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if len(attempt_history) >= RATE_LIMIT_MAX_ATTEMPTS:
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retry_after = int(max(1, RATE_LIMIT_WINDOW_SECONDS - (now - attempt_history[0])))
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return JSONResponse(
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status_code=status.HTTP_429_TOO_MANY_REQUESTS,
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content={"detail": "登录尝试过于频繁，请稍后再试"},
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headers={"Retry-After": str(retry_after)},
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)
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attempt_history.append(now)
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response = await call_next(request)
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if response.status_code < 400:
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async with _attempt_lock:
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_login_attempts.pop(client_ip, None)
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return response
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return await call_next(request)
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# 鉴权中间件
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class AuthMiddleware(BaseHTTPMiddleware):
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async def dispatch(self, request: Request, call_next):
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# 获取请求路径
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path = request.url.path
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# 检查是否为公开路径，公开路径无需身份验证
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if is_public_path(path):
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return await call_next(request)
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if not path.startswith("/api"):
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# 非API路径，可能是前端路由或静态资源
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return await call_next(request)
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# # 提取Authorization头
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# auth_header = request.headers.get("Authorization")
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# if not auth_header or not auth_header.startswith("Bearer "):
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# return JSONResponse(
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# status_code=status.HTTP_401_UNAUTHORIZED,
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# content={"detail": f"请先登录。Path: {path}"},
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# headers={"WWW-Authenticate": "Bearer"}
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# )
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# # 获取token
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# token = auth_header.split("Bearer ")[1]
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# # 添加token到请求状态，后续路由可以直接使用
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# request.state.token = token
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# 继续处理请求
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return await call_next(request)
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# 添加访问日志中间件（记录请求处理时间）
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app.add_middleware(AccessLogMiddleware)
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# 添加鉴权中间件
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app.add_middleware(LoginRateLimitMiddleware)
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app.add_middleware(AuthMiddleware)
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if __name__ == "__main__":
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# uvicorn.run(app, host="0.0.0.0", port=5050, threads=10, workers=10, reload=True)
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uvicorn.run(
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"server.main:app",
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host="0.0.0.0",
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port=5050,
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reload=True,
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reload_dirs=["server", "src"],
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) |