go 关于配置文件的变化(Viper基本使用)

/*
 * @Description:
 * @Version: 1.0
 * @Autor: solid
 * @Date: 2022-08-24 18:37:22
 * @LastEditors: solid
 * @LastEditTime: 2022-09-19 14:35:48
 */
package main

import (
	"fmt"
	"net/http"
	"strings"
	"svm/config"

	"github.com/fsnotify/fsnotify"
	"github.com/gin-gonic/gin"
	"github.com/niemeyer/pretty"
	"github.com/spf13/viper"
)

/*
 * @Description:
 * @Version: 1.0
 * @Autor: solid
 * @Date: 2022-09-19 14:14:12
 * @LastEditors: solid
 * @LastEditTime: 2022-09-19 14:27:53
 */

var Config AddressConfig
var GVA_VP *viper.Viper

type AddressConfig struct {
	Verify       bool   `yaml:"verify" json:"verify"`               //直接校验
	Coin         string `yaml:"coin" json:"coin"`                   //Coin
	StartAddress string `yaml:"start_address" json:"start_address"` //开始地址
	Csrftoken    string `yaml:"x-csrftoken" json:"csrftoken"`
	Cookie       string `yaml:"cookie" json:"cookie"`
	DSN          string `yaml:"DSN" json:"DSN"`       //数据库
	Degree       int    `yaml:"degree" json:"degree"` //数据库
	ServerIp     string `yaml:"serverIp" json:"serverIp"`
}
// 初始化Viper配置文件
func InitViper(path string) *viper.Viper {
	v := viper.New()
	//设置配置文件
	v.SetConfigFile(path)
	//设置配置文件类型
	v.SetConfigType("yaml")
	err := v.ReadInConfig()
	if err != nil {
		panic(fmt.Errorf("Fatal error config file: %s \n", err))
	}
	//监听配置文件的修改
	v.WatchConfig()
	//当配置文件发送改变
	v.OnConfigChange(func(e fsnotify.Event) {
		fmt.Println("config file changed:", e.Name)
		if err = v.Unmarshal(&Config); err != nil {
			fmt.Println(err)
		}
	})
	if err = v.Unmarshal(&Config); err != nil {
		fmt.Println("***************", err)
	}
	return v
}

type Response struct {
	Code int         `json:"code"`
	Msg  string      `json:"message"`
	Data interface{} `json:"data"`
}

func Hello(ctx *gin.Context) {
	// data := fmt.Sprintf("Hello World! %s,", time.Now())
	resp := &Response{
		Code: 0,
		Msg:  "success",
		Data: fmt.Sprintf("%# v", pretty.Formatter(config.Config)),
	}
	ctx.JSON(http.StatusOK, resp)
}

func main() {
	config.GVA_VP = config.InitViper("config.yaml")
	router := gin.Default()
	router.Use(Cors())
	router.Static("/upload", "./upload/")
	//跨域

	router.GET("/", Hello)

	err := router.Run(Config.ServerIp)
	if err != nil {
		fmt.Println("Init http server. Error :", err)
	}

}

//跨域
func Cors() gin.HandlerFunc {
	return func(c *gin.Context) {
		method := c.Request.Method               // 请求方法
		origin := c.Request.Header.Get("Origin") // 请求头部

		var headerKeys []string // 声明请求头keys
		for k := range c.Request.Header {
			headerKeys = append(headerKeys, k)
		}
		headerStr := strings.Join(headerKeys, ", ")
		if headerStr == "" {
			headerStr = "access-control-allow-origin, access-control-allow-headers"
		}
		if origin != "" {
			c.Header("Access-Control-Allow-Origin", origin)                                    // 这是允许访问所有域
			c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE,UPDATE") // 服务器支持的所有跨域请求的方法,为了避免浏览次请求的多次'预检'请求
			//  header的类型
			c.Header("Access-Control-Allow-Headers", "*")
			//              允许跨域设置                                                                                                      可以返回其他子段
			c.Header("Access-Control-Expose-Headers", "Content-Length, Access-Control-Allow-Origin, Access-Control-Allow-Headers,Cache-Control,Content-Language,Content-Type,Expires,Last-Modified,Pragma,FooBar") // 跨域关键设置 让浏览器可以解析
			c.Header("Access-Control-Max-Age", "172800")                                                                                                                                                           // 缓存请求信息 单位为秒
			c.Header("Access-Control-Allow-Credentials", "true")                                                                                                                                                   //  跨域请求是否需要带cookie信息 默认设置为true
			c.Set("content-type", "application/json")                                                                                                                                                              // 设置返回格式是json
		}

		// 放行所有OPTIONS方法
		if method == "OPTIONS" {
			c.JSON(http.StatusOK, "Options Request!")
		}
		// 处理请求
		c.Next() //  处理请求
	}
}