详解Golang如何动态获取配置文件

viper.SetDefault("ContentDir", "content")
viper.SetDefault("LayoutDir", "layouts")
viper.SetDefault("Taxonomies", map[string]string{"tag": "tags", "category": "categories"})

viper.SetConfigName("config") // name of config file (without extension)
viper.SetConfigType("yaml") // REQUIRED if the config file does not have the extension in the name
viper.AddConfigPath("/etc/appname/")   // path to look for the config file in
viper.AddConfigPath("$HOME/.appname")  // call multiple times to add many search paths
viper.AddConfigPath(".")               // optionally look for config in the working directory
err := viper.ReadInConfig() // Find and read the config file
if err != nil { // Handle errors reading the config file
    panic(fmt.Errorf("Fatal error config file: %s \n", err))
}

viper.WatchConfig()
viper.OnConfigChange(func(e fsnotify.Event) {
    fmt.Println("Config file changed:", e.Name)
})

Version: "2.1"
Debug: false
MongoDB:
  IP: 127.0.0.1
  Port: 27017
  DbName: "db_name"

package main
import (
    "fmt"
    "github.com/fsnotify/fsnotify"
    "github.com/gin-gonic/gin"
    "github.com/spf13/viper"
)
var config *viper.Viper
func main() {
    config = initConfigure()
    r := gin.Default()
    r.GET("/getConfig", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "config": config.AllSettings(),
        })
    })
    r.Run() // listen and serve on 0.0.0.0:8080
}
func initConfigure() *viper.Viper {
    v := viper.New()
    v.SetConfigName("config") // 设置文件名称（无后缀）
    v.SetConfigType("yaml")   // 设置后缀名 {"1.6以后的版本可以不设置该后缀"}
    v.AddConfigPath("./")  // 设置文件所在路径
    v.Set("verbose", true) // 设置默认参数
    if err := v.ReadInConfig(); err != nil {
        if _, ok := err.(viper.ConfigFileNotFoundError); ok {
            panic(" Config file not found; ignore error if desired")
        } else {
            panic("Config file was found but another error was produced")
        }
    }
    // 监控配置和重新获取配置
    v.WatchConfig()
    v.OnConfigChange(func(e fsnotify.Event) {
        fmt.Println("Config file changed:", e.Name)
    })
    return v
}