Laravel schedule push notification and cancel it if necessary

Question

In my app with Laravel on back-end users can send messages to each other.

I want to send push notification to app users on new inbox message, but I need to send messages only if user hadn't already read this message.

So I see it that way

On every message sended I need to schedule Laravel notification after 1 minute
if user already received this message I need to cancel this notification

How can dismiss scheduled notification in Laravel? Is this approach fine and actual now?

Class extends Notification

public function via($notifiable)
{
    if($this->dontSend($notifiable)) {
        return [];
    }
    return ['mail'];
}

public function dontSend($notifiable)
{
    return $this->appointment->status === 'cancelled';
}

Maybe there is more convenient way to handle it? For example, to send push every time but somehow dismiss it showing from app if it's already launched?

How do you know whether the user received the notification? Do you keep track of it ? — Ersoy, Jun 30 '20 at 18:26
If app has enabled push notifications I can track them inside app and make some API request to server if needed — moonvader, Jun 30 '20 at 19:50

Ersoy · Accepted Answer · 2020-07-04T09:20:04.923

One way to do it would be something like this;

Before you trigger your notification create a unique identifier(sha1 could be an option) with the combination of user_id. Let's say it is SgiA7EfBQBFQK3pjRWtaxB1CkSf7gf4lSixvei3jU3ydHJ39ZGjhhdUUCnHRno3C. Send it to the notification. Both notification and message will be send at the same time, but notification will have one minute delay.

$identifier = Str::random(64);
$delay = now()->addMinute();
$user->notify((new MyNotification($identifier))->delay($delay));
// send a request that contains identifier.

You set this to the Redis with TTL of 2 minutes. It will be gone if there is no action.

Redis::set('SgiA7EfBQBFQK3pjRWtaxB1CkSf7gf4lSixvei3jU3ydHJ39ZGjhhdUUCnHRno3C', 1, 120);

While sending a message to the user, attach this identifier to the message. When user read that message, you make a request to your /read endpoint with all the parameters + the identifier.
When you receive the request, delete the key from Redis. (user received the message)

Redis::del('SgiA7EfBQBFQK3pjRWtaxB1CkSf7gf4lSixvei3jU3ydHJ39ZGjhhdUUCnHRno3C');

In your Notification class, implement a small method to check whether the key exists in Redis.

Redis::exists('SgiA7EfBQBFQK3pjRWtaxB1CkSf7gf4lSixvei3jU3ydHJ39ZGjhhdUUCnHRno3C');

class MyNotification extends BaseNotification
{
    use Queueable;

    private $identifier;

    public function __construct($identifier)
    {
        $this->identifier = $identifier;
    }

    public function via()
    {
        return $this->isValid() ? ['mail'] : [];
    }

    public function isValid()
    {
        return Redis::exists($this->identifier);
    }

    public function toMail()
    {
        // details..
    }
}

It doesn't have to be Redis but it is a perfect match for these kind of key/value structure.

it this case I need to trigger notification after 2 minutes? — moonvader, Jul 04 '20 at 04:17
Actually you will trigger it when you send the message. It will be delayed notification with 1 minute delay — Ersoy, Jul 04 '20 at 06:50

Laravel schedule push notification and cancel it if necessary

1 Answers1