packagecoretypeLogLevelintconst(// !nashtsai! following level also match syslog.Priority valueLOG_DEBUGLogLevel=iotaLOG_INFOLOG_WARNINGLOG_ERRLOG_OFFLOG_UNKNOWN)// logger interfacetypeILoggerinterface{Debug(v...interface{})Debugf(formatstring,v...interface{})Error(v...interface{})Errorf(formatstring,v...interface{})Info(v...interface{})Infof(formatstring,v...interface{})Warn(v...interface{})Warnf(formatstring,v...interface{})Level()LogLevelSetLevel(lLogLevel)ShowSQL(show...bool)IsShowSQL()bool}