gin框架使用【7.中间件使用】

func Default() *Engine {
   debugPrintWARNINGDefault()
   engine := New()
   engine.Use(Logger(), Recovery())
   return engine
}

func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes {
   engine.RouterGroup.Use(middleware...)
   engine.rebuild404Handlers()
   engine.rebuild405Handlers()
   return engine
}

func (group *RouterGroup) POST(relativePath string, handlers ...HandlerFunc) IRoutes {
   return group.handle(http.MethodPost, relativePath, handlers)
}

func (group *RouterGroup) GET(relativePath string, handlers ...HandlerFunc) IRoutes {
   return group.handle(http.MethodGet, relativePath, handlers)
}

//针对全局路由的BasicAuth
func main() {
	router := gin.Default()
	router.Use(gin.BasicAuth(gin.Accounts{
		"dba" : "dbapass",
	}))
	router.GET("/users", func(c *gin.Context) {
		c.JSON(200, true)
	})
	router.Run(":8080")
}

//针对路由组的BasicAuth

func main() {

   router := gin.Default()
   v1RouterGroup := router.Group("/v1")
   v1RouterGroup.Use(gin.BasicAuth(gin.Accounts{
      "dba" : "dbapass",
   }))
   {
      v1RouterGroup.GET("/users", func(c *gin.Context) {
         c.JSON(200, true)                 //true
      })
   }
   router.Run(":8080")
}

// 针对特定路由的BasicAuth

func main() {
   router := gin.Default()
   v1RouterGroup := router.Group("/v1")
   {
      v1RouterGroup.GET("/users", gin.BasicAuth(gin.Accounts{
         "dba" : "dbapass",
      }), func(c *gin.Context) {
         c.JSON(200, true)                 //true
      })
   }
   router.Run(":8080")
}

func costTime() gin.HandlerFunc {
	return func(c *gin.Context) {
		start := time.Now()
		c.Next()
		costTime := time.Since(start)
		url := c.Request.URL.String()
		logger.Debug("url %s exec cost %d", url, costTime)
	}
}

// Next should be used only inside middleware.
// It executes the pending handlers in the chain inside the calling handler.
// See example in GitHub.
// 在执行的 handler 中执行HandlerFunc链中挂起的 handler
func (c *Context) Next() {
	c.index++
	for c.index < int8(len(c.handlers)) {
		c.handlers[c.index](c)
		c.index++
	}
}

// Abort prevents pending handlers from being called. Note that this will not stop the current handler.
// Let‘s say you have an authorization middleware that validates that the current request is authorized.
// If the authorization fails (ex: the password does not match), call Abort to ensure the remaining handlers
// for this request are not called.
// Abort 在被调用的函数中阻止挂起函数。注意这将不会停止当前的函数。例如，你有一个验证当前的请求是否是认证过的 Authorization 中间件。
// 如果验证失败(例如，密码不匹配)，调用 Abort 以确保这个请求的其他函数不会被调用。
func (c *Context) Abort() {
   c.index = abortIndex
}