package mmdb import ( "sync" C "github.com/Dreamacro/clash/constant" "github.com/Dreamacro/clash/log" "github.com/oschwald/geoip2-golang" ) var ( mmdb *geoip2.Reader once sync.Once ) func LoadFromBytes(buffer []byte) { once.Do(func() { var err error mmdb, err = geoip2.FromBytes(buffer) if err != nil { log.Fatalln("Can't load mmdb: %s", err.Error()) } }) } func Verify() bool { instance, err := geoip2.Open(C.Path.MMDB()) if err == nil { instance.Close() } return err == nil } func Instance() *geoip2.Reader { once.Do(func() { var err error mmdb, err = geoip2.Open(C.Path.MMDB()) if err != nil { log.Fatalln("Can't load mmdb: %s", err.Error()) } }) return mmdb }