* The queue worker script
*
* To be run as the application component responsible for watermarking uploaded images. Polls queue for new jobs
* and will keep polling queue until there are now jobs left, when it will wait for 20 seconds before continuing
* to poll the queue.
*
* @package PhpSqsTutorial
* @author George Webb <*****@*****.**>
* @license http://opensource.org/licenses/MIT MIT License
* @link http://george.webb.uno/posts/aws-simple-queue-service-php-sdk
*/
require_once __DIR__ . '/config.php';
require_once __DIR__ . '/vendor/autoload.php';
use Gaw508\PhpSqsTutorial\Queue;
// Instantiate queue with aws credentials from config.
$queue = new Queue(QUEUE_NAME, unserialize(AWS_CREDENTIALS));
// Continuously poll queue for new messages and process them.
while (true) {
$message = $queue->receive();
if ($message) {
try {
$message->process();
$queue->delete($message);
} catch (Exception $e) {
$queue->release($message);
echo $e->getMessage();
}
} else {
// Wait 20 seconds if no jobs in queue to minimise requests to AWS API
sleep(20);
}
} elseif (!filesize($_FILES['images']['tmp_name'][$i])) {
$warnings[] = array('class' => 'alert-danger', 'text' => 'Error uploading file.');
} elseif ($_FILES['images']['type'][$i] != 'image/png' and $_FILES['images']['type'][$i] != 'image/jpeg') {
$warnings[] = array('class' => 'alert-danger', 'text' => 'Invalid file type.');
} elseif ($_FILES['images']['size'][$i] > 2000000) {
$warnings[] = array('class' => 'alert-danger', 'text' => 'File too big.');
} else {
// Create a new filename for the uploaded image and move it there
$extension = $_FILES['images']['type'][$i] == 'image/png' ? '.png' : '.jpg';
$new_name = uniqid() . $extension;
if (!move_uploaded_file($_FILES['images']['tmp_name'][$i], __DIR__ . '/images/queued/' . $new_name)) {
$warnings[] = array('class' => 'alert-danger', 'text' => 'Error uploading file.');
} else {
// Create a new message with processing instructions and push to SQS queue
$message = new Message(array('input_file_path' => __DIR__ . '/images/queued/' . $new_name, 'output_file_path' => __DIR__ . '/images/watermarked/' . $new_name));
$queue = new Queue(QUEUE_NAME, unserialize(AWS_CREDENTIALS));
if ($queue->send($message)) {
$successes++;
} else {
$warnings[] = array('class' => 'alert-danger', 'text' => 'Error adding file to queue.');
}
}
}
}
if ($successes > 0) {
$warnings[] = array('class' => 'alert-success', 'text' => "{$successes} images uploaded successfully.");
$warnings[] = array('class' => 'alert-info', 'text' => "Uploaded images added to queue...");
}
}
}
?>
