logger

type Config struct {
	Level      Level
	AppName    string
	LogFile    string
	TimeFormat string
	CallerSkip int
	Caller     bool
	UseColor   bool
	UseJSON    bool
	StdLog     bool
	Debug      bool
}

type Engine string

type KV = map[string]interface{}

type Level int

type Logger interface {
	SetLevel(level Level)
	Debug(args ...interface{})
	Debugln(args ...interface{})
	Debugf(format string, args ...interface{})
	DebugWithFields(msg string, KV KV)
	Info(args ...interface{})
	Infoln(args ...interface{})
	Infof(format string, args ...interface{})
	InfoWithFields(msg string, KV KV)
	Warn(args ...interface{})
	Warnln(args ...interface{})
	Warnf(format string, args ...interface{})
	WarnWithFields(msg string, KV KV)
	Error(args ...interface{})
	Errorln(args ...interface{})
	Errorf(format string, args ...interface{})
	ErrorWithFields(msg string, KV KV)
	Errors(err error)
	Fatal(args ...interface{})
	Fatalln(args ...interface{})
	Fatalf(format string, args ...interface{})
	FatalWithFields(msg string, KV KV)
	IsValid() bool // IsValid check if Logger is created using constructor

	StdTrace(requestID string, contextID string, err error, metadata interface{}, message string)
	StdTracef(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
	StdDebug(requestID string, contextID string, err error, metadata interface{}, message string)
	StdDebugf(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
	StdInfo(requestID string, contextID string, err error, metadata interface{}, message string)
	StdInfof(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
	StdWarn(requestID string, contextID string, err error, metadata interface{}, message string)
	StdWarnf(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
	StdError(requestID string, contextID string, err error, metadata interface{}, message string)
	StdErrorf(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
	StdFatal(requestID string, contextID string, err error, metadata interface{}, message string)
	StdFatalf(requestID string, contextID string, err error, metadata interface{}, format string, args ...interface{})
}