www-tests/promises/index.php

<?php

// https://xrg.io/tests/promises

require_once(dirname(__FILE__) .'/vendor/autoload.php');

// lib.php, helper functions
Lib\plain();
Lib\printf('https://sergio.am/code/www-tests');

use GuzzleHttp\Client;
use GuzzleHttp\Pool;

Lib\printf('client');

$client = new Client();

Lib\printf('requests');

$requests = function ($n) use ($client) {
    $uri = 'https://xrg.io/tests/promises/sleep.php?';

    for ($i = 0; $i < $n; $i++) {
        yield function() use ($client, $uri, $i) {
            Lib\printf('  yield i='. $i);
            return $client->getAsync($uri . http_build_query(['i' => $i, 's' => random_int(1, 5)]));
        };
    }
};

Lib\printf('pool');

$pool = new Pool($client, $requests(3), [
    'concurrency' => 5,
    'fulfilled' => function ($response, $index) {
        Lib\printf('  i='. $index .' '. $response->getBody());
    },
    'rejected' => function ($reason, $index) {
        Lib\printf('  '. $index .' '. $reason);
    },
]);

Lib\printf('promise');
// Initiate the transfers and create a promise
$promise = $pool->promise();

Lib\printf('wait');
// Force the pool of requests to complete.
$promise->wait();

Lib\printf('end');