如何使用中間件方法有效處理 Gin Web 應用程式中的錯誤？

<code class="go">type appError struct {
    Code    int
    Message string
}

func JSONAppErrorReporter() gin.HandlerFunc {
    return func(c *gin.Context) {
        c.Next()
        errors := c.Errors.ByType(gin.ErrorTypeAny)

        if len(errors) > 0 {
            err := errors[0].Err
            var parsedError *appError
            switch err.(type) {
            case *appError:
                parsedError = err.(*appError)
            default:
                parsedError = &appError{
                    Code:    http.StatusInternalServerError,
                    Message: "Internal Server Error",
                }
            }
            // Respond with JSON serialized error
            c.IndentedJSON(parsedError.Code, parsedError)
            c.Abort()
        }
    }
}</code>

<code class="go">func fetchSingleHostGroup(c *gin.Context) {
    hostgroupID := c.Param("id")

    hostGroupRes, err := getHostGroupResource(hostgroupID)

    if err != nil {
        // Attach error to the context
        c.Error(err)
        return
    }

    // Respond with valid data
    c.JSON(http.StatusOK, *hostGroupRes)
}</code>

<code class="go">func main() {
    router := gin.Default()
    router.Use(JSONAppErrorReporter())
    router.GET("/hostgroups/:id", fetchSingleHostGroup)
    router.Run(":3000")
}</code>