golang-gin（三）API中间件

默认情况下不带中间件的空白Gin

使用

r := gin.New()

替代

// Default With the Logger and Recovery middleware already attached
r := gin.Default()

使用中间件

func main() {
    // Creates a router without any middleware by default
    r := gin.New()

    // Global middleware
    // Logger middleware will write the logs to gin.DefaultWriter even if you set with GIN_MODE=release.
    // By default gin.DefaultWriter = os.Stdout
    r.Use(gin.Logger())

    // Recovery middleware recovers from any panics and writes a 500 if there was one.
    r.Use(gin.Recovery())

    // Per route middleware, you can add as many as you desire.
    r.GET("/benchmark", MyBenchLogger(), benchEndpoint)

    // Authorization group
    // authorized := r.Group("/", AuthRequired())
    // exactly the same as:
    authorized := r.Group("/")
    // per group middleware! in this case we use the custom created
    // AuthRequired() middleware just in the "authorized" group.
    authorized.Use(AuthRequired())
    {
        authorized.POST("/login", loginEndpoint)
        authorized.POST("/submit", submitEndpoint)
        authorized.POST("/read", readEndpoint)

        // nested group
        testing := authorized.Group("testing")
        testing.GET("/analytics", analyticsEndpoint)
    }

    // Listen and serve on 0.0.0.0:8080
    r.Run(":8080")
}

自定义恢复行为

func main() {
    // Creates a router without any middleware by default
    r := gin.New()

    // Global middleware
    // Logger middleware will write the logs to gin.DefaultWriter even if you set with GIN_MODE=release.
    // By default gin.DefaultWriter = os.Stdout
    r.Use(gin.Logger())

    // Recovery middleware recovers from any panics and writes a 500 if there was one.
    r.Use(gin.CustomRecovery(func(c *gin.Context, recovered interface{}) {
        if err, ok := recovered.(string); ok {
            c.String(http.StatusInternalServerError, fmt.Sprintf("error: %s", err))
        }
        c.AbortWithStatus(http.StatusInternalServerError)
    }))

    r.GET("/panic", func(c *gin.Context) {
        // panic with a string -- the custom middleware could save this to a database or report it to the user
        panic("foo")
    })

    r.GET("/", func(c *gin.Context) {
        c.String(http.StatusOK, "ohai")
    })

    // Listen and serve on 0.0.0.0:8080
    r.Run(":8080")
}