xlog

type Fields map[string]interface{}

type Logger interface {
	Debugf(format string, args ...interface{})
	Infof(format string, args ...interface{})
	Warnf(format string, args ...interface{})
	Tracef(format string, args ...interface{})
	Errorf(format string, args ...interface{})
	Fatalf(format string, args ...interface{})
	Debug(msg string)
	Info(msg string)
	Warn(msg string)
	Trace(msg string)
	Error(msg string)
	Fatal(msg string)

	WithXFields(fields Fields) Logger
	WithXField(key string, value interface{}) Logger
}

type LoggerCfg struct {
	Level      string
	TimeFormat string
	Out        io.Writer
}