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# Drupal 8 Webprofiler

### Michael Lenahan

### Drupal-Entwickler bei [erdfisch](erdfish.de), Heidelberg

*Shameless plug*: Drupal Camp Heidelberg, April 2016

*date to be confirmed*

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# Webprofiler toolbar

![Webprofiler toolbar](images/webprofiler-1.png)

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# Webprofiler module

https://www.drupal.org/project/webprofiler

https://www.drupal.org/u/lussoluca

https://events.drupal.org/barcelona2015/schedule/2015-09-24

https://events.drupal.org/barcelona2015/sessions/how-drupal-8-builds-your-pages

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# Setup

- Install Drupal 8
- Install webprofiler module
- (Install examples module)

Disable Optimizations

if (file_exists(__DIR__ . '/settings.local.php')) {
      include __DIR__ . '/settings.local.php';
    }

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# Webprofiler configuration

Data collector plugins

IDE Link integration

See README in webprofiler/README.md for more tips on IDE links for various
OS/IDE combinations.

Ubuntu/Sublime-Text IDE Link:

http://stackoverflow.com/questions/14676981/sublime-text-url-handler-for-ubuntu

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# Route, Controller

This is a route:

page_example_simple:
      path: 'examples/page_example/simple'
      defaults:
        _controller: '\Drupal\page_example\Controller\PageExampleController::simple'
        _title: 'Simple - no arguments'
      requirements:
        _permission: 'access simple page'

The _controller provides a drupal *render array*, or http response object

This is a slightly more complex route, with two arguments:

page_example_arguments:
      path: 'examples/page_example/arguments/{first}/{second}'

So, if you go to: examples/page_example/arguments/23/kwatsch

You get a 403 response.

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# Route, Controller (2)

... as we said, you get a 403 response.

You can see why, in the controller:

public function arguments($first, $second) {
      // Make sure you don't trust the URL to be safe! Always check for exploits.
      if (!is_numeric($first) || !is_numeric($second)) {
        // We will just show a standard "access denied" page in this case.
        throw new AccessDeniedHttpException();
      }
      ...

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# Forms

In Drupal 8, all forms are built using the buildForm() method of the Controller.

In the webprofiler Form widget, the elements of the Form API array are listed.

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# Services

Services contain business logic:
- for easy reuse
- for easy testing

A good example of a service is:
cache.backend.null
... in development.services.yml

Drupal core has over 500 services defined, each does a specific job:
- translate a text
- run a database query
- send an email
- authenticate a user

We can see a complete list of all the services in the Services widget.
We can see which services have been initialized on this request.
INFO --> we can see the dependencies that a service has
Count: # of times the service requested
Time taken to initialize the service (only initialized once)

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# Databases

One example of a service is the database service.

This service is so important, it has it's own widget.

SWAP PLACEHOLDERS

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# Theme layer

Twig timeline and dependencies

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# Data collectors are exensible!

Rules module

Themekey module

Debugging information will be collected using Webprofiler

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# Thank you!

Especially lussoluca