rd

type Config struct {
	// if is redis-cluster
	IsCluster bool

	// required redis addr
	Address string
	// if has password
	Password string

	// default is 10 seconds
	DialTimeout time.Duration
	// default is 10 seconds
	ReadTimeout time.Duration
	// default is 10 seconds
	WriteTimeout time.Duration

	// default is 20
	OpenConns int
	// default is keep alive
	Lifetime time.Duration

	// Prefix will wrap redis-key at head
	// default is nil
	Prefix func(key string) (keyWithPrefix string)

	// DB select redis database
	// default is nil
	// useless in cluster
	DB int
}

type RD interface {
	// ErrNil declare NIL-error
	ErrNil() error

	// Do execute redis command
	Do(cmd string, args ...interface{}) (interface{}, error)

	DoBool(cmd string, args ...interface{}) (bool, error)
	DoBytes(cmd string, args ...interface{}) ([]byte, error)
	DoFloat64(cmd string, args ...interface{}) (float64, error)
	DoInt(cmd string, args ...interface{}) (int, error)
	DoInt64(cmd string, args ...interface{}) (int64, error)
	DoInts(cmd string, args ...interface{}) ([]int, error)
	DoString(cmd string, args ...interface{}) (string, error)
	DoStringMap(cmd string, args ...interface{}) (map[string]string, error)
	DoStrings(cmd string, args ...interface{}) ([]string, error)

	Values(cmd string, args ...interface{}) ([]interface{}, error)
	Scan(src []interface{}, dst ...interface{}) ([]interface{}, error)

	Close()
}