regi2p/checker.php

<?php
require __DIR__ . '/vendor/autoload.php';
require __DIR__ . '/config.php';

use App\BOB;
use App\DB;
use Amp\Loop;
use Amp\Parallel\Worker\DefaultPool;

/* Disable execution limit */
set_time_limit(0);

$pdo = (new DB($options))->pdo;

$results = [];

$STH = $pdo->query("SELECT `host`, `base32` FROM `hosts`");
$hosts = $STH->fetchAll(PDO::FETCH_KEY_PAIR);

/* Start temporary BOB tunnel for checking */
$bob = new BOB($options);
$bob->setnick();
$bob->options();
$bob->newkeys();
$bob->intun();
$bob->start();

/* Sleep 10 seconds awaitng tunnels get built */
echo "BOB session started, awaiting 10 seconds for tunnels" . PHP_EOL;
sleep(10);

/* Start async checker tasks */
Loop::run(function () use (&$results, $hosts, $options) {
    $pool = new DefaultPool(64);

    $coroutines = [];

    foreach ($hosts as $host => $base32) {
        $coroutines[$host] = Amp\call(function () use ($pool, $base32, $options) {
            $result = yield $pool->enqueue(new App\Checker($base32, $options));
            return $result;
        });
    }

    $results = yield Amp\Promise\all($coroutines);

    return yield $pool->shutdown();
});

/* Stop BOB tunnel and terminate */
$bob->stop();
$bob->clear();
$bob = null;

/* Update last seen time in DB */
$i = 0;
$pdo->beginTransaction();

foreach ($results as $host => $result)
{
    if($result)
    {
        $pdo->exec("UPDATE `hosts` SET `last_seen` = current_timestamp() WHERE `host` = '" . $host . "'");
        $i++;
    }
}

$pdo->commit();

echo "Result: Total hosts: " . count($results) . ", Alive: " . $i . PHP_EOL;