Sending emails in Silex via Swiftmailer spool

bootstrap.php

<?php

//...your silex bootstrap.

//Configure Swiftmail to use SMTP.
$app->register(new SwiftmailerExtension(), array(
     'swiftmailer.options' => array(
            'host' => 'smtp.gmail.com',
            'port' => 465,
            'username' => '[email protected]',
            'password' => 'simplepassword',
            'encryption' => 'ssl',
            'auth_mode' => 'login'),
      'swiftmailer.class_path' => __DIR__.'/../vendor/swiftmailer/lib/classes'
));

//Right we now need to set the transport to Spool.

//Set the directory you want the spool to be in.
$app["swiftmailer.spool"] = new \Swift_FileSpool(__DIR__."/../spool");
//Take a copy of the original transport, we'll need that later.
$app["swiftmailer.transport.original"] = $app["swiftmailer.transport"];
//Create a spool transport
$app["swiftmailer.transport"] = new \Swift_Transport_SpoolTransport($app['swiftmailer.transport.eventdispatcher'], $app["swiftmailer.spool"]);

//...more silex boostrap

console.php

#!/usr/bin/env php
<?php

//Bootstrap our Silex application
$app = require __DIR__ . '/../src/bootstrap.php';

//Include the namespaces of the components we plan to use
use Symfony\Component\Console\Application;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

//Instantiate our Console application
$console = new Application('Silex Console', '1');
 
$console->register( 'send-email' )
->setDefinition( array(
         new InputOption('message-limit', '', InputOption::VALUE_OPTIONAL, 'The maximum number of messages to send.'),
         new InputOption('time-limit', 0, InputOption::VALUE_OPTIONAL, 'The time limit for sending messages (in seconds).'),
    )
)
->setDescription('Send emails from the spool')
->setHelp(<<<EOF
The <info>swiftmailer:spool:send</info> command sends all emails from the spool.

<info>php bin/console.php send-email --message-limit=10 --time-limit=10</info>

EOF
)
->setCode(
    function (InputInterface $input, OutputInterface $output) use ($app) {
        $transport  = $app["swiftmailer.transport"];

        if ($transport instanceof \Swift_Transport_SpoolTransport) {
            $spool = $transport->getSpool();
            $spool->setMessageLimit($input->getOption('message-limit'));
            $spool->setTimeLimit($input->getOption('time-limit'));
            $sent = $spool->flushQueue($app["swiftmailer.transport.original"]);
            $output->writeln(sprintf('sent %s emails', $sent));
        }
    }
);

$console->run();