redis缓存替换+pgvector向量替换

ai-chat-backend/pkg/middlewares/rate_limit.go

@@ -0,0 +1,23 @@
+package middlewares
+
+import (
+	"github.com/gin-gonic/gin"
+	"golang.org/x/time/rate"
+)
+
+func RateLimitMiddleware(r rate.Limit, b int) gin.HandlerFunc {
+	limiter := rate.NewLimiter(r, b)
+	return func(c *gin.Context) {
+		if !limiter.Allow() {
+			// 请求被限制，返回错误信息
+			c.JSON(429, gin.H{
+				"status":  "Fail",
+				"message": "Too many requests, please try again later",
+				"data":    nil,
+			})
+			c.Abort()
+			return
+		}
+		c.Next()
+	}
+}