feat: 添加超时中间件以处理请求超时

server/middleware/timeout.go

@@ -0,0 +1,55 @@
+package middleware
+
+import (
+	"context"
+	"github.com/gin-gonic/gin"
+	"net/http"
+	"time"
+)
+
+// TimeoutMiddleware 创建超时中间件
+// 入参 timeout 设置超时时间（例如：time.Second * 5）
+// 使用示例 xxx.Get("path",middleware.TimeoutMiddleware(30*time.Second),HandleFunc)
+func TimeoutMiddleware(timeout time.Duration) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ctx, cancel := context.WithTimeout(c.Request.Context(), timeout)
+		defer cancel()
+
+		c.Request = c.Request.WithContext(ctx)
+
+		// 使用 buffered channel 避免 goroutine 泄漏
+		done := make(chan struct{}, 1)
+		panicChan := make(chan interface{}, 1)
+
+		go func() {
+			defer func() {
+				if p := recover(); p != nil {
+					select {
+					case panicChan <- p:
+					default:
+					}
+				}
+				select {
+				case done <- struct{}{}:
+				default:
+				}
+			}()
+			c.Next()
+		}()
+
+		select {
+		case p := <-panicChan:
+			panic(p)
+		case <-done:
+			return
+		case <-ctx.Done():
+			// 确保服务器超时设置足够长
+			c.Header("Connection", "close")
+			c.AbortWithStatusJSON(http.StatusGatewayTimeout, gin.H{
+				"code": 504,
+				"msg":  "请求超时",
+			})
+			return
+		}
+	}
+}