Running a custom cron job

DrupalDev

8/14/24, 6:14 AM

I'm trying to implement a newsletter subscription on Drupal 10 that will send an email to all the subscribers automatically. I work in a restrictive environment where I'm not allowed to use custom modules and the choice of modules available is pretty restrictive so I cant hook the cron job using modules. Is there anyway I can implement a cron job from scratch or hook it using the theme file. I've thought about hooking into the theme_page and then comparing the time to a stored variable but that would probably make it more complicated because of concurrency issues.

0 + 6

cron

emails

leymannx

8/14/24, 8:51 AM

Are you sure hook_cron is not triggered when it lives in a *.theme file?

apaderno

8/14/24, 9:29 AM

@leymannx Given the code used by [`Cron::invokeCronHandlers()`](https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Cron.php/function/Cron%3A%3AinvokeCronHandlers/9), only module implementations of `hook_cron()` are invoked. It would also be a bad idea to implement such hooks in a theme. It is also the wrong workaround for a "do not use custom modules" rule that is not thought to force developers to put code that should go in a custom module in a theme. I can understand the reason to put such restriction, even if I find it too restrictive.

Kevin

8/14/24, 1:26 PM

```I work in a restrictive environment where I'm not allowed to use custom modules and the choice of modules available is pretty restrictive so I cant hook the cron job using modules.``` this is going to eliminate 99.9% of whats possible in a CMS or any platform. It will also make any question under this circumstance next to impossible to answer in a reasonable way.

apaderno

8/15/24, 3:31 AM

If none of the modules you are allowed to install help in creating a newsletter subscription, there is not much you can do, as @Kevin said. If newsletter subscription is a feature to implement on a site, you can only say that is not possible to implement with those restrictions. I assume that newsletter subscription is really the feature you are asked to implement.

DrupalDev

8/15/24, 6:42 AM

@apaderno Is hooking the preprocess page not recommended?

apaderno

8/15/24, 8:56 AM

The purpose of theme hooks like `hook_preprocess_node()` is to change how a page is rendered or provide that information to template files. It is not a replacement for other hooks you cannot implement because you are not allowed to use custom modules. This means theme hooks cannot be used to send emails or even find a list of specific nodes that should be shown in the page, for example because they are related to the shown node.

Elon Musk

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EN: Running a custom cron job

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