func ExportChain(blockchain *core.BlockChain, fn string) error { glog.Infoln("Exporting blockchain to", fn) fh, err := os.OpenFile(fn, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.ModePerm) if err != nil { return err } defer fh.Close() if err := blockchain.Export(fh); err != nil { return err } glog.Infoln("Exported blockchain to", fn) return nil }