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Wrapping PHP in Symfony2Integrating Drupal8 into Symfony2

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When Drupal8 started rocking the PHP world

The technical challenges of PHP wrapping

Integrating Drupal8 into Symfony2, step by step

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Drupal usage is growing 2x faster than WordpressDrupal’s position in the CMS landscape

• Drupal is used by 2% of the top 1 million websites, according to W3Techs.com

• +21% growth last year!To compare with Joomla: +0% and Wordpress:

+11%

• Acquia expects $68 million revenue in 2013 with +50% growth

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Drupal powers many influential websitesDrupal’s position in the CMS landscape

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Drupal powers many influential websitesDrupal’s position in the CMS landscape

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Drupal 8 is due this year after two years of hard workThe new Drupal version

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Drupal 8 is due this year after two years of hard workThe new Drupal version

• 7 core initiatives organized in a Scrum-ish way• Mobile• Multilingual• Layouts• Views in core• HTML5• Web Services• Configuration Management

• The last phase « API completion » started on July 1st

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Drupal 8 wants to become a content management platformThe web service core initiative

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So Larry started looking for a good Request/Response library to include in the Web Services core initiative…The introduction of the HttpKernel

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…and that is when Stof changed the PHP worldHow Drupal chose Symfony2

« And then this French guy Stof spent hours on IRC with me, convincing me step by step how all my problems would be solved by the HttpKernel. I realised afterwards it was nighttime in France »

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Since then Symfony2 is taking over Drupal 8Symfony2 components adopted by Drupal 8

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Since then Symfony2 is taking over Drupal 8Drufony

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16 000 additional contributors to Symfony2!The power of the Drupal community

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When Drupal8 started rocking the PHP world

The technical challenges of PHP wrapping

Integrating Drupal8 into Symfony2, step by step

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Why is wrapping not as easy as include?Challenges behind PHP wrapping

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PHP is designed around « one request <-> one process »Challenges behind PHP wrapping

The consequences of this simple design are obvious:

• Want to output something? echo to STDOUT• Want to end the request? => exit()• Want to share something inside the process? => $GLOBAL• Want to call two classes with the same name? => who needs that?

PHP is everything but Stateless

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Catching the output

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Catching the exits

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Handling globals

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Class and function conflictsHistory of PHP applications

• Write a custom autoloader for classes• And for functions…

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Handling session already startedHistory of PHP applications

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When Drupal8 started rocking the PHP world

The technical challenges of PHP wrapping

Integrating Drupal8 into Symfony2, step by step

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A big picture of how a request is handled by Drupal 8Drupal 8 architecture

The start is (almost) like Symfony

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A big picture of how a request is handled by Drupal 8Drupal 8 architecture

Authentication

• is handled by AuthenticationSubscriber started by the onKernelRequestAuthenticate event

• Depends on the AuthenticationManager service

• That choses between the Cookie or HTTPBasic provider

• In the end the Cookie provider just wraps the legacy drupal_session_initialize()

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A big picture of how a request is handled by Drupal 8Drupal 8 architecture

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A big picture of how a request is handled by Drupal 8Drupal 8 architecture

Routing• Is handled by the CMFChainRouter• Which looks first in the DynamicRouter and then the

LegacyUrlMatcher• LegacyUrlMatcher just wraps menu_get_item()

HTMLPageController• Wraps drupal_render_page

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A big picture of how a request is handled by Drupal 8Drupal 8 architecture

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Let’s start to hack! Integration plan

Goals

• #1: Wrap Drupal in Symfony2

• #2: Access Drupal nodes and session from a Symfony2 controller

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Routing between Symfony2 and DrupalTheodoDrupal8Bundle\RouterListener

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Routing between Symfony2 and DrupalTheodoDrupal8Bundle\RouterListener

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Routing between Symfony2 and DrupalTheodoDrupal8Bundle\RouterListener

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Buffering the kernelTheodoDrupal8Bundle\RouterListener

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Cannot redeclare assetic_init()Class loading issues

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Cannot redeclare assetic_init()Class loading issues

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Cannot redeclare assetic_init()Class loading issues

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Symlinks to what Drupal expects to be in web rootAssets and symlinks

Symbolic links to modules, profiles, sites and themes

Symbolic links to the same folders (and just these) in core

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Change Drupal settings accordinglyAssets and symlinks

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http://sf2drupal/app_dev.php/user works!Routing demo

Symfony’s debug toolbar!

Drupal’s new responsive theme

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There is still a bug in the Symfony profiler…RequestDataCollector bug

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Corrected in a PULL REQUEST!RequestDataCollector bug

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Access every service from core.services.ymlDrupal Service Container

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For example: accessing node contentgetNode

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Getting the Drupal connected usergetCurrentUser

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Integrating Drupal 8 into Symfony2DemoController

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Integrating Drupal 8 into Symfony2!DemoController

Node content!

Current user name!

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How to do this at homeTheodoDrupal8bundle

https://github.com/theodo/TheodoDrupal8Bundle

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Tips to help you continue integratingPHP integration

• Good IDE + Xdebug to follow the code

• Put a breakpoint at error handling functions, to read the error inside the code

• Compare the same functionality/page with and without wrapping

• Other interesting bundle: https://github.com/theodo/TheodoEvolutionSessionBundle

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What are the next prioritiesNext steps

• Integration must bring ease of adding custom logic in Symfony controllers => like RogerCMS

• See how Symfony2 can improve Drupal 8 performances…• Session and permission sharing

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Questions ?fabriceb@theodo.fr

@theodowww.theodo.fr

Feedback: https://joind.in/9329