How to use a Controller method inside a service with dependency injection?

Question

I'm using the diff module for a project, this module has a method inside a Controller that I want to use in a service to reuse code. As this time I'm just calling the method like PluginRevisionController::getRevisionIds() but this give me the message:

Deprecated function: Non-static method Drupal\diff\Controller\PluginRevisionController::getRevisionIds() should not be called statically

So, I want to 'inject' if possible in some way the Controller (I really don't know if this is possible) inside the service to reuse the logic. There is a way to do this?

Answer 1

You could inject a ClassResolverInterface or ControllerResolverInterface into your service to load a controller instance.

From core.services.yml:

controller_resolver:
  class: Drupal\Core\Controller\ControllerResolver
  arguments: ['@psr7.http_message_factory', '@class_resolver']
class_resolver:
  class: Drupal\Core\DependencyInjection\ClassResolver
  calls:
    - [setContainer, ['@service_container']]

Both classes will return an instance, just the method names differ.

$controller = $this->classResolver->getInstanceFromDefinition(PluginRevisionController::class);
$controller = $this->controllerResolver->getControllerFromDefinition(PluginRevisionController::class);