Use dependency injection

[wimleers]

Business Requirements

• [x] As a developer I want to use a drupal module that uses PHP best practices like dependency injection.

  Technical Requirements

• [x] Research Symphony and Drupal Services. See if it makes sense to implement API endpoints as symphony services
• [x] Update module to use service instead of raw calls to PHPSDK
• [x] Add any phpunit tests as necessary.

  Background

This module currently very much uses a D7 pattern, of using \Drupal::config() (~ variable_get()) and then instantiating objects all over the place.

Instead of exposing services that have their configuration injected, and those services can then be injected again, without every piece of code needing to retrieve the configuration and instantiate such an object again with that configuration.

Clear example of this: https://github.com/wimleers/cloudflare/commit/3281a7d74033b3ee2ab13834cd2bf24e327c62bc#diff-a35ab1b58293fa8fcf5e19b41a5f79e8L104.

[aweingarten]

@wimleers I love this suggestion! There is a similar issue on the SDK queue: https://github.com/d8-contrib-modules/cloudflarephpsdk/issues/12

Naive question: is there any major difference that you are aware of between Symphony and Drupal services/dependency injection.

[wimleers]

Drupal == Symfony in this regard.

[aweingarten]

I've done some cursory research from what I can tell it makes the most sense to implement the service in CloudFlare rather than PHPSDK due to the dependencies on CMI.

[aweingarten]

Merged code in