gocommon/reflect_config.go

package gocommon

import (
	"encoding/json"
	"os"
	"time"

	"repositories.action2quare.com/ayo/gocommon/flagx"
)

var configfileflag = flagx.String("config", "", "")

func configFilePath() string {
	configfilepath := "config.json"
	if configfileflag != nil && len(*configfileflag) > 0 {
		configfilepath = *configfileflag
	}

	return configfilepath
}

func ConfigModTime() time.Time {
	fi, err := os.Stat(configFilePath())
	if err == nil {
		return fi.ModTime()
	}
	return time.Time{}
}

func MonitorConfig[T any](onChanged func(newconf *T)) error {
	fi, err := os.Stat(configFilePath())
	if err != nil {
		return err
	}

	go func(modTime time.Time, filepath string) {
		for {
			if fi, err := os.Stat(filepath); err == nil {
				if modTime != fi.ModTime() {
					var next T
					if err := LoadConfig(&next); err == nil {
						fi, _ := os.Stat(filepath)
						modTime = fi.ModTime()

						onChanged(&next)
					}
				}
			}
			time.Sleep(time.Second)
		}
	}(fi.ModTime(), configFilePath())

	return nil
}

func LoadConfig[T any](outptr *T) error {
	configfilepath := configFilePath()
	content, err := os.ReadFile(configfilepath)
	if os.IsNotExist(err) {
		return os.WriteFile(configfilepath, []byte("{}"), 0666)
	}

	return json.Unmarshal(content, outptr)
}

type StorageAddr struct {
	Mongo string
	Redis struct {
		URL    string
		Offset map[string]int
	}
}

type RegionStorageConfig struct {
	RegionStorage map[string]StorageAddr `json:"region_storage"`
}