Provide function that combines `sleep()` and `timeout()`

[lcobucci]

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For an event-driven API with user interactions, I need to provide endpoints that delay the response for a while to wait for potential interactions and take an action once a timeout is reached.

I've implemented something in a possibly hacky way and believe it would be a potential feature for this lib:

namespace React\Promise\Timer;

use Closure;

use function React\Async\async;
use function React\Async\await;

/**
 * @param Closure():bool $stopCondition,
 * @param Closure():void $onTimeout
 */
function waitUntil(
    Closure $stopCondition,
    float $verificationInterval,
    Closure $onTimeout,
    float $timeout,
): void {
    try {
        $wait = async(static function () use ($stopCondition, $verificationInterval): void {
            while (! $stopCondition()) {
                await(sleep($verificationInterval)); // Timer\sleep() btw
            }
        });

        await(timeout($wait(), $timeout)); // Timer\timeout() btw
    } catch (TimeoutException) {
        $onTimeout();
    }
}

You certainly have ideas on how to turn this into a decent feature or just bin it. I'm happy either way 😂

[SimonFrings]

Hey @lcobucci, already a win if this helps you with your project 👍

Whether this will be a new feature or not depends on how many people need this for their use cases. If there's a demand for this I can see this as a future addition to the project. ^^

[lcobucci]

I completely understand it, my goal was mostly sharing and/or picking your brains. That solution works for me, which is enough atm 😂