configs

package main

import (
	"fmt"
	"github.com/chen56/go-common/configs"
	"github.com/chen56/go-common/must"
)

type Log struct {
	Level string `yaml:"level" json:"level"`
}
type Conf struct {
	Log     Log    `yaml:"log"  json:"log"`
	AppInfo string `yaml:"appInfo"  json:"appInfo"`
}

func main() {
	var config1 = configs.NewMemoryConfigSource([]byte(`
log:
  level: error
appInfo: log=${log_level}
`))
	var config2 = configs.NewMemoryConfigSource([]byte(`
log:
  level: debug
`))

	c := configs.NewConfig(configs.NewConfigOptions{ConfigSources: []configs.ConfigSource{config1, config2}})

	conf := Conf{}
	err := c.ScanConfig(&conf)
	must.NoError(err)
	//spew.Dump(c)
	fmt.Printf("%+v", conf)

}

Output:

{Log:{Level:debug} AppInfo:log=debug}