Redis XLEN in Golang (Detailed Guide w/ Code Examples)

Use Case(s)

The XLEN command in Redis is used when you want to fetch the length of a stream denoted by a key. It's commonly used in applications that utilize activity streams, message queues, or any use case that requires handling streams of data.

Code Examples

Let's say we have a stream named "mystream". You can get the length of this stream with the help of the XLEN command.

Here's an example using Go and the go-redis library:

package main import ( "" "fmt" ) func main() { client := redis.NewClient(&redis.Options{ Addr: "localhost:6379", Password: "", // no password set DB: 0, // use default DB }) len, err := client.XLen("mystream").Result() if err != nil { panic(err) } fmt.Println(len) }

In this code, we first make a connection to our Redis server. Then using client.XLen("mystream").Result(), we retrieve the length of the stream and handle any errors.

Best Practices

  • Always check for errors after executing a Redis command. Network issues or incorrect keys may lead to errors which should be appropriately handled.
  • Ensure your Redis server is running and accessible from your application.

Common Mistakes

  • A common mistake is not checking if the stream exists before trying to get its length. This could potentially return an error.
  • Using incorrect keys. Make sure the key corresponds to the stream whose length you want to retrieve.


Q: What does XLen return if the stream does not exist?

A: If the stream does not exist, XLen will return 0.

Q: Can I use XLen with data structures other than streams?

A: No, the XLen command is specific to stream data structures in Redis.

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