add FallbackMailer

[JanTvrdik]

Simple mailer which can retry sending mail multiple times with either one ore multiple mailers.

[JanTvrdik]

Some open questions:

• Should the total number of retries by $retryCount or $retryCount * count($this->mailers)?
• Should we log the exceptions? I don't know how to do it without depending on Tracy\ILogger. Or should we just emit warnings?

[dg]

To throw, to log is task for a diffent layer.

[JanTvrdik]

Poetic but I don't understand what you mean. Does that mean that I should move the FallbackMailer to Nextras because it cannot be implemented in Nette?

[dg]

I tried to say that FallbackMailer should not log exceptions. It is not its responsibility. It can provide some callback, but not log them.

[milo]

What about to check, that mailers is not empty?

[JanTvrdik]

Good point, I'll add the check in constructor.

[JanTvrdik]

This is ready to merge from my point of view.

[dg]

All setters in nette should return $this. But even better is to omit anything that is not really needed. I think that except addMailer() is not need nothing. And with addMailer() should be if (!$mailers) { throw ... tested later.

[f3l1x]

Wow. Good job. 👍

---

I was not sure it could be part of nette/mail package. I use for every project on my local devstack something that I called FileMailer. Do you think it could be also part of package?

Implementation is really small and cool.

<?php
use Nette\Mail\IMailer;
use Nette\Mail\Message;

final class FileMailer implements IMailer
{

    /** @var string */
    private $path;

    /**
     * @param string $path
     */
    public function __construct($path)
    {
        $this->path = $path;
    }

    /**
     * @param Message $mail
     */
    public function send(Message $mail)
    {
        @mkdir($path, 0777, TRUE);
        file_put_contents($this->path . date('Y-m-d H-i-s') . microtime() . '.eml', $mail->generateMessage());
    }

}

Should I prepare PR with tests? @JanTvrdik @dg

[JanTvrdik]

@f3l1x What do you use it for?

[f3l1x]

Dump message to folder, open in editor, check design especially for newsletter, verify all EML options/requirements (html vs plain) etc.