How to do a SCAN?

[JeffBNimble]

So, I've read the Common Examples section of the README and there is no example of doing a SCAN.

This is the best I've come up with, but unsure if rueidis does the iteration by cursor for me or do I have to?

cursor := 0 count := 100 pattern := "someKeyPrefix:*" client.Do(client.B().Scan().Cursor(cursor).Match(pattern).Count(count).Type(?).Build())
Here are my questions:

1. I'm confused by Scan Type. What do I specify for that?
2. How do I get the keys back that match the pattern?
3. Am I able to use Scan with DoCache()? If so, what does that end up doing? Does it just scan the local cache?

[rueian]

Hi @JeffBNimble,

Rueidis doesn't do the iteration. How to do the iteration is up to you. Here is an example for you to reference:

rueidis/rueidis_test.go

Lines 369 to 385 in 6556f2f

	func ExampleClient_scan() {
	client, err := NewClient(ClientOption{InitAddress: []string{"127.0.0.1:6379"}})
	if err != nil {
	panic(err)
	}
	defer client.Close()
	for _, c := range client.Nodes() { // loop over all your redis nodes
	var scan ScanEntry
	for more := true; more; more = scan.Cursor != 0 {
	if scan, err = c.Do(context.Background(), c.B().Scan().Cursor(scan.Cursor).Build()).AsScanEntry(); err != nil {
	panic(err)
	}
	fmt.Println(scan.Elements)
	}
	}
	}

1. The Type parameter is optional. It serves as a data type filter. You can find more details here.
2. As shown in the above example, you can use the AsScanEntry() helper and get the keys from the scan.Elements.
3. No, DoCache() only works with read-only commands having key specified.

[JeffBNimble]

Thank you!