Using HttpKernelInterface for Painless Integration

Oct 1, 20140 likes1,054 views

In this short session we will look at one of the Symfony2 components adopted since Drupal 8; the HttpKernelInterface. Attendees will gain familiarity with this component, the related Request and Response objects, and the overall top level structure of a Drupal 8 project's integration. We will also see how the Stack PHP project allows us to easily integrate a Drupal 8 site with another codebase that uses the HttpKernelInterface (including Symfony2, Silex, Laravel or even another Drupal 8 project). We will also explore some of the other functionality that can be added by Stack, all enabled by this powerful abstraction.

USING THE SYMFONY2 COMPONENTS
FOR PAINLESS INTEGRATION
C I A R A N M C N U L T Y
L I G H T N I N G T A L K S S E S S I O N 1

”SYMFONY2 IS A REUSABLE SET OF STANDALONE,
DECOUPLED, AND COHESIVE PHP COMPONENTS
THAT SOLVE COMMON WEB DEVELOPMENT
PROBLEMS.”
– F A B I E N P O T E N C I E R , 2 0 1 1

SYMFONY2 ADOPTION
http://zalas.eu/symfony2-adoption/

SYMFONY2 ADOPTION
Driven by Components
Out of 4994 packages that depend on Symfony:
!
1911 depend on the symfony/framework-bundle,
!
1985 depend on specific components,
!
1098 depend on symfony/symfony.
http://zalas.eu/symfony2-adoption/

SYMFONY2 ADOPTION
SHARED COMPONENTS
!
=
!
INTEROPERABILITY

REQUEST/RESPONSE MODEL
HTTP REQUEST HTTP RESPONSE
APPLICATION

REQUEST/RESPONSE MODEL
HTTP REQUEST HTTP RESPONSE
APPLICATION
Request Object Response Object
SymfonyComponentHttpFoundationRequest SymfonyComponentHttpFoundationResponse

$KERNEL INTERFACE interface HttpKernelInterface { const MASTER_REQUEST = 1; const SUB_REQUEST = 2; ! /** * @return Response */ public function handle( Request $request, $type = self::MASTER_REQUEST, $catch = true ); }$

SYMFONY FRAMEWORK USAGE
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
!
$request = Request::createFromGlobals();
!
$response = $kernel->handle($request);
!
$response->send();

DRUPAL 8 USAGE
$request = Request::createFromGlobals();
!
$kernel = DrupalKernel::createFromRequest(
$request,
$autoloader,
‘prod'
);
!
$response = $kernel->handle($request);
!
$response->send();

SYMFONY2 PAGE CACHING
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
!
$kernel = new AppCache($kernel);
!
$request = Request::createFromGlobals();
!
$response = $kernel->handle($request);
!
$response->send();

“Symfony's HttpKernelInterface provides a solid interface, which
makes creating and sharing framework-agnostic HTTP filters a breeze”

$WRITING A MIDDLEWARE class DrupalConPromoter implements HttpKernelInterface { private $innerKernel; ! public function __construct(HttpKernelInterface $kernel) { $this->innerKernel = $kernel; } ! public function handle( Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true ) { $response = $this->innerKernel->handle($request, $type, $catch); $newContent = str_replace( '<body>', '<body><h1>DRUPALCON ROCKS</h1>', $response->getContents()); $response->setContents($newContent); ! return $response; } }$

USING OUR OWN MIDDLEWARE
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
$kernel = new AppCache($kernel);
!
$kernel = new DrupalConPromoter($kernel);
!
$request = Request::createFromGlobals();
!
$response = $kernel->handle($request);
!
$response->send();

AVAILABLE MIDDLEWARES
CookieGuard - Encrypts/decrypts cookies
!
GeoIP - Looks up country from IP and adds to Request
!
CORS - Adds CORS headers
!
Negotiation - Works out what content-type to send client
!
IpRestrict - block blacklisted IP Requests
!
Backstage - displays maintenance page if one exists
!
+ plenty more!

USING IN DRUPAL
Problem:
’Edit index.php’ is not something a typical Drupal
developer is happy with
!
Solution:
Middlewares are registered via the Service Container
(another Symfony component)
<service id=“my_drupalcon_promoter”
class=“DrupalConPromoter”>"
" <tag name=“http_middleware” priority=“1” />"
</service>

RUNNING MULTIPLE KERNELS
!
$request = Request::createFromGlobals();
!
$symfonyKernel = new AppKernel('prod', false);
$symfonyKernel->loadClassCache();
!
$drupalKernel = DrupalKernel::createFromRequest(
$request,
$autoloader,
'prod'
);
!
$kernel = UrlMap(
$drupalKernel,
['/blog' => $symfonyKernel]
);
!
$response = $kernel->handle($request);
$response->send();

CIARAN MCNULTY
!
@ciaranmcnulty
!
Core contributor to PhpSpec
!
BDD / Agile / DDD enthusiast
!
Senior Trainer at Inviqa Group

WHAT DID YOU THINK?
E V A U L A T E T H I S S E S S I O N - A M S T E R D A M 2 0 1 4 . D R U P A L . O R G / S C H E D U L E
THANK YOU!

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Using HttpKernelInterface for Painless Integration

1. USING THE SYMFONY2 COMPONENTS FOR PAINLESS INTEGRATION C I A R A N M C N U L T Y L I G H T N I N G T A L K S S E S S I O N 1

2. DRUPAL + SYMFONY

3. ”SYMFONY2 IS A REUSABLE SET OF STANDALONE, DECOUPLED, AND COHESIVE PHP COMPONENTS THAT SOLVE COMMON WEB DEVELOPMENT PROBLEMS.” – F A B I E N P O T E N C I E R , 2 0 1 1

4. SYMFONY2 ADOPTION http://zalas.eu/symfony2-adoption/

5. SYMFONY2 ADOPTION Driven by Components Out of 4994 packages that depend on Symfony: ! 1911 depend on the symfony/framework-bundle, ! 1985 depend on specific components, ! 1098 depend on symfony/symfony. http://zalas.eu/symfony2-adoption/

6. SYMFONY2 ADOPTION SHARED COMPONENTS ! = ! INTEROPERABILITY

7. HTTPFOUNDATION + HTTPKERNEL

8. REQUEST/RESPONSE MODEL HTTP REQUEST HTTP RESPONSE APPLICATION

9. REQUEST/RESPONSE MODEL HTTP REQUEST HTTP RESPONSE APPLICATION Request Object Response Object SymfonyComponentHttpFoundationRequest SymfonyComponentHttpFoundationResponse

10. REQUEST/RESPONSE MODEL HTTP REQUEST HTTP RESPONSE APPLICATION Request Object Response Object SymfonyComponentHttpFoundationRequest SymfonyComponentHttpFoundationResponse Kernel Interface SymfonyComponentHttpKernelHttpKernelInterface

11. KERNEL INTERFACE interface HttpKernelInterface { const MASTER_REQUEST = 1; const SUB_REQUEST = 2; ! /** * @return Response */ public function handle( Request $request, $type = self::MASTER_REQUEST, $catch = true ); }

12. SYMFONY FRAMEWORK USAGE $kernel = new AppKernel('prod', false); $kernel->loadClassCache(); ! $request = Request::createFromGlobals(); ! $response = $kernel->handle($request); ! $response->send();

13. DRUPAL 8 USAGE $request = Request::createFromGlobals(); ! $kernel = DrupalKernel::createFromRequest( $request, $autoloader, ‘prod' ); ! $response = $kernel->handle($request); ! $response->send();

14. HTTPKERNEL USAGE

15. WHAT IS THE BENEFIT?

16. SYMFONY2 PAGE CACHING $kernel = new AppKernel('prod', false); $kernel->loadClassCache(); ! $kernel = new AppCache($kernel); ! $request = Request::createFromGlobals(); ! $response = $kernel->handle($request); ! $response->send();

17. “Symfony's HttpKernelInterface provides a solid interface, which makes creating and sharing framework-agnostic HTTP filters a breeze”

18. WRITING A MIDDLEWARE class DrupalConPromoter implements HttpKernelInterface { private $innerKernel; ! public function __construct(HttpKernelInterface $kernel) { $this->innerKernel = $kernel; } ! public function handle( Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true ) { $response = $this->innerKernel->handle($request, $type, $catch); $newContent = str_replace( '<body>', '<body><h1>DRUPALCON ROCKS</h1>', $response->getContents()); $response->setContents($newContent); ! return $response; } }

19. USING OUR OWN MIDDLEWARE $kernel = new AppKernel('prod', false); $kernel->loadClassCache(); $kernel = new AppCache($kernel); ! $kernel = new DrupalConPromoter($kernel); ! $request = Request::createFromGlobals(); ! $response = $kernel->handle($request); ! $response->send();

20. AVAILABLE MIDDLEWARES CookieGuard - Encrypts/decrypts cookies ! GeoIP - Looks up country from IP and adds to Request ! CORS - Adds CORS headers ! Negotiation - Works out what content-type to send client ! IpRestrict - block blacklisted IP Requests ! Backstage - displays maintenance page if one exists ! + plenty more!

21. USING IN DRUPAL Problem: ’Edit index.php’ is not something a typical Drupal developer is happy with ! Solution: Middlewares are registered via the Service Container (another Symfony component) <service id=“my_drupalcon_promoter” class=“DrupalConPromoter”>" " <tag name=“http_middleware” priority=“1” />" </service>

22. RUNNING MULTIPLE KERNELS ! $request = Request::createFromGlobals(); ! $symfonyKernel = new AppKernel('prod', false); $symfonyKernel->loadClassCache(); ! $drupalKernel = DrupalKernel::createFromRequest( $request, $autoloader, 'prod' ); ! $kernel = UrlMap( $drupalKernel, ['/blog' => $symfonyKernel] ); ! $response = $kernel->handle($request); $response->send();

23. CIARAN MCNULTY ! @ciaranmcnulty ! Core contributor to PhpSpec ! BDD / Agile / DDD enthusiast ! Senior Trainer at Inviqa Group

24. See us on stand 309

25. WHAT DID YOU THINK? E V A U L A T E T H I S S E S S I O N - A M S T E R D A M 2 0 1 4 . D R U P A L . O R G / S C H E D U L E THANK YOU!

Using HttpKernelInterface for Painless Integration

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