Please explain why I got infinite loop.

[39george]

Hello, and thanks for this amazing crate!
I can't understand why I got an infinite loop here:

    while let Some(mut page) = redis_client
        .scan("*", Some(10), None)
        .try_next()
        .await
        .unwrap()
    {
        if let Some(keys) = page.take_results() {
            dbg!(keys);
        }
        page.next().unwrap();
    }

But if I extract redis_client.scan(..) into the variable, the infinite loop is gone, and I got all my keys from redis:

    let mut scan = redis_client.scan("*", Some(10), None);
    while let Some(mut page) = scan.try_next().await.unwrap() {
        if let Some(keys) = page.take_results() {
            dbg!(keys);
        }
        page.next().unwrap();
    }

[aembke]

Hi @ghashy,

SCAN works by repeatedly sending a SCAN <cursor> ... command to the server with an updated cursor after each page.

In the first example you're sending a new SCAN 0 ... call with a fresh starting cursor on each iteration in the while loop, and the second one is properly paging through the results. Or in other words - in the first example you're calling both scan and try_next on each loop iteration, but in the second you're only calling try_next on each iteration.

[39george]

Thanks!