logging

func Debugf(format string, args ...interface{})

func Debugw(msg string, args ...interface{})

func Errorf(format string, args ...interface{}) error

func Errorw(msg string, args ...interface{})

func Fatalf(format string, args ...interface{})

func Fatalw(msg string, args ...interface{})

func Infof(format string, args ...interface{})

func Infow(msg string, args ...interface{})

func Init(level string, encoding string, opts ...string)

func Panicf(format string, args ...interface{})

func Panicw(msg string, args ...interface{})

func Warnf(format string, args ...interface{})

func Warnw(msg string, args ...interface{})