获取redis golang的队列长度

Question

I am using go-redis package. I fired below query:

rd.LLen("queue_1")

Which returning me below result with type *redis.IntCmd:

llen queue_1: 100001

Count is perfect but I want only count with type of int. Can anyone help?

Answer 1

the LLen func looks like: func (c *cmdable) LLen(key string) *IntCmd

So it returns an IntCmd type. IntCmd provides this function: func (cmd *IntCmd) Val() int64

So you can do e.g.

cmd := rd.LLen("queue_1")
i := cmd.Val() //i will be an int64 type

Answer 2

Use the Result or Val method. As documented, these return the int64 value returned from the command.

Answer 3

The documentation for IntCmd shows the following:

func (cmd *IntCmd) Result() (int64, error)

func (cmd *IntCmd) Val() int64

So it seems you can either get the int64 value and any error to check, or just the int64 value. Is there a reason this is not sufficient?

You can call them as follows:

// Get the value and check the error.
if val, err := res.Result(); err != nil {
  panic(err)
} else {
  fmt.Println("Queue length: ", val)
}

// Get the value, but ignore errors (probably a bad idea).
fmt.Println("Queue length: ", res.Val())