go-ayo/common을 gocommon으로 분리

reflect_config.go

@@ -0,0 +1,75 @@
+package common
+
+import (
+	"encoding/json"
+	"flag"
+	"os"
+	"time"
+)
+
+var configfileflag = flag.String("config", "", "")
+
+func configFilePath() string {
+	configfilepath := "./config_template.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"`
+}