[question] Can we use Timer::add(0, $func, $vars, false) to run tasks async

[joanhey]

Hi,
I have seen that in other frameworks, in reality is the base of async.

Timer::add(0, $func, $vars, false);
Theoretically this task will be included to schedule in the event loop.
If so, perhaps it will be better to add a Timer::once(0, $func, $vars);.

Example:
Timer::add(0, $send_mail, $vars, false);

What do you think @walkor ??

[walkor]

I'm not sure if all the drivers (event, Uv, revolt, swoole, etc.) support passing 0 as the timer value. If they do, Workerman should indeed support it as well.

[xpader]

I think that name is defer.

[joanhey]

With 0 or 0.0, return Exception: bad time_interval (using select event).

Now I'm testing with Adapterman and Symfony $kernel->terminate, and for now seems that it's working.

function run(): string
{
    global $kernel;

    ob_start();

    $request = Request::createFromGlobals();
    $response = $kernel->handle($request);
    $response->send();

    Timer::add(0.001, function () use ($kernel, $request, $response) {
        $kernel->terminate($request, $response);
    }, persistent: false);


    //$kernel->terminate($request, $response);
    
    return ob_get_clean();
}

[joanhey]

Example with Adapterman and Symfony.

Using Timer to defer $kernel->terminate($request, $response);

Timer::add(0.001, function () use ($kernel, $request, $response) {
        $kernel->terminate($request, $response);
    }, persistent: false);


//$kernel->terminate($request, $response);

Without defer, run inmediatelly:

With defer, run after enter in the event loop:

The data to create the graph, it's sent in the kernel.terminate.

[joanhey]

To show the requests with time used with Adapterman (or Workerman) live in the terminal, it's as simple as:

 $http_worker->onMessage = static function ($connection, $request) {
    
    $start = microtime(true);
    $connection->send(run());
    Worker::safeEcho($_SERVER['REQUEST_METHOD'] ."\t". $_SERVER['REQUEST_URI'] ."\t". round((microtime(1) - $start) * 1000, 4) . ' ms' . PHP_EOL);
};