Is there a way to seed the generators?

[giorgiosironi]

I am interested in using this library as an option for random test input in Eris, but I was wondering if is possible to seed the generators to get a reproducible test run. This option may depend on the source, as I don't think /dev/urandom is seedable at all while mt_rand() is, albeit by using global state.

Thank you for any pointers.

[ircmaxell]

No, there is no way to see the generators, and there shouldn't be.

If you need something for testing, mock the generator. If you need a predictable sequence, you can build a single source that's predictable using a hash function to mutate its state.

final class Sequence implements \RandomLib\Source { 
    protected $seed;
    public function __construct($seed) {
        $this->seed = hash('sha512', $seed, true);
    }
    public function generate($size) {
        $result = '';
        while ($size < strlen($result)) {
            $result .= substr($this->seed = hash('sha512', $this->seed, true), 0, 16);
        }
        return substr($result, 0, $size);
    }
}

THIS IS NOT SECURE so only use this for non-sensitive sequences

[giorgiosironi]

Not that this is the intended usage of this library, but my use case is generating random input for tests while being able to repeat a failed test to check its resolution. Thanks for the clarification, will look elsewhere.