Details of how to send a slack message when a job fails

AppServiceProvider.php

public function boot()
{
  Queue::failing(function (JobFailed $event) use ($slackUrl) {
    Notification::route('slack', $slackUrl)->notify(new SlackFailedJob($event));
  });
}

SlackFailedJob.php

<?php

namespace App\Notifications;

use Illuminate\Bus\Queueable;
use Illuminate\Notifications\Messages\SlackAttachment;
use Illuminate\Notifications\Messages\SlackMessage;
use Illuminate\Notifications\Notification;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Queue\Events\JobFailed;

class SlackFailedJob extends Notification implements ShouldQueue
{
    use Queueable;

    /**
     * @var JobFailed
     */
    public $event;

    /**
     * Create a new notification instance.
     *
     * @param JobFailed $event
     */
    public function __construct(JobFailed $event)
    {
        $this->event = $event;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['slack'];
    }

    /**
     * Get the Slack representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return SlackMessage
     */
    public function toSlack($notifiable)
    {
        return (new SlackMessage)
            ->content('A job failed at '.config('app.name'))
            ->attachment(function (SlackAttachment $attachment) use ($notifiable) {
                $attachment->fields([
                    'Exception message' => $notifiable->event->exception->getMessage(),
                    'Job class' => $notifiable->event->job->resolveName(),
                    'Job body' => $notifiable->event->job->getRawBody(),
                    'Exception' => $notifiable->event->exception->getTraceAsString(),
                ]);
            });
    }
}

@idoqo it's the queue facade.

Got it. Thanks!

$notifiable doesn't have those properties so I had to replace it with $this->event.I am using Laravel 5.8 and it worked for me after following changes:

public function toSlack($notifiable) { return (new SlackMessage) ->content('A job failed at '.config('app.name')) ->attachment(function (SlackAttachment $attachment) use ($notifiable) { $attachment->fields([ 'Exception message' => $this->event->exception->getMessage(), 'Job class' => $this->event->job->resolveName(), 'Job body' => $this->event->job->getRawBody(), 'Exception' => $this->event->exception->getTraceAsString(), ]); }); }