Golang实现Web中间件链处理方法

func loggingMiddleware(next http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        log.Printf("%s %s", r.Method, r.URL.Path)
        next.ServeHTTP(w, r)
    })
}
func authMiddleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
token := r.Header.Get("Authorization")
if token == "" {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
return
}
next.ServeHTTP(w, r)
})
}

handler := http.HandlerFunc(yourHandler)
wrapped := loggingMiddleware(authMiddleware(handler))
http.Handle("/", wrapped)

r := gin.New()
r.Use(loggingMiddlewareGin())  // 全局中间件
r.Use(authMiddlewareGin())
r.GET("/ping", func(c *gin.Context) {
c.JSON(200, gin.H{"message": "pong"})
})
r.Run(":8080")

func loggingMiddlewareGin() gin.HandlerFunc {
    return func(c *gin.Context) {
        log.Println(c.Request.URL.Path)
        c.Next() // 继续执行后续中间件或处理器
    }
}

func Compose(middlewares ...func(http.Handler) http.Handler) func(http.Handler) http.Handler {
    return func(final http.Handler) http.Handler {
        for i := len(middlewares) - 1; i >= 0; i-- {
            final = middlewares[i](final)
        }
        return final
    }
}

m1 := loggingMiddleware
m2 := authMiddleware
composed := Compose(m1, m2)
handler := composed(http.HandlerFunc(yourHandler))
http.Handle("/", handler)

import "github.com/justinas/alice"
chain := alice.New(loggingMiddleware, authMiddleware).Then(http.HandlerFunc(yourHandler))
http.Handle("/", chain)