Laravel and redis scan

问题:

I am trying to use redis scan with laravel. I can make a single request which returns 10 keys but I wish to loop until all the keys have been returned. I am unsure how to do this with laravel. Currently I have

$test = Redis::scan(0, 'match', '*keypattern*');

I don't know if there is a 'laravel' way of doing this.

EDIT:

I used composer to import predis/predis and got it working with

use Predis\Collection\Iterator;
use Predis;

...

$client = new Predis\Client([
    'scheme' => 'tcp',
    'host'   => 'localhost',
    'port'   => 6379,
]);

foreach (new Iterator\Keyspace($client, '*keypattern*') as $key) {
     $arr[] = $key;
}

but I would like to know the laravel way

EDIT:

var_dump of the single Redis::scan

array(2) {
  [0]=>
  string(4) "23"
  [1]=>
  array(10) {
    [0]=>
    string(19) "key17"
    [1]=>
    string(19) "key72"
    [2]=>
    string(76) "key11"
    [3]=>
    string(19) "key73"
    [4]=>
    string(19) "key63"
    [5]=>
    string(19) "key87"
    [6]=>
    string(19) "key70"
    [7]=>
    string(19) "key65"
    [8]=>
    string(19) "key82"
    [9]=>
    string(19) "key43"
  }
}

回答1:

As the Redis facade passes commands directly to Predis (or Redis itself you might say), this goes hand in hand with the Redis docs (http://redis.io/commands/scan). You can use the cursor (first array entry) for subsequent calls to iterate until the cursor is zero.

I've put together a recursive approach, to scan all entries:

function scanAllForMatch ($pattern, $cursor=null, $allResults=array()) {

    // Zero means full iteration
    if ($cursor==="0") {
        return $allResults;
    }

    // No $cursor means init
    if ($cursor===null) {
        $cursor = "0";
    }

    // The call
    $result = Redis::scan($cursor, 'match', $pattern);

    // Append results to array
    $allResults = array_merge($allResults, $result[1]);

    // Recursive call until cursor is 0
    return scanAllForMatch($pattern, $result[0], $allResults);
}

Note that you might need to add $this before the recursion, if you use this in a class (would be return $this->scanAllForMatch(...))

You would call it like that:

// Don't pass a cursor yourself!
$allResults = scanAllForMatch('*keypattern*');

回答2:

Thanks @martinczerwi Here is a non-recursional version:

function scanAllForMatch($pattern)
{
    $cursor = 0;
    do {
        list($cursor, $keys) = Redis::scan($cursor, 'match', $pattern);
        foreach ($keys as $key) {
            yield $key;
        }
    } while ($cursor);
}