Slides de la charla 'Symfony Internals' en DeSymfony 2012

3. ¿Quién soy?
Raúl Fraile
@raulfraile
PHP/Symfony2 freelance developer

4. ¿Qué hago?

5. SensioLabsConnect

6. ¿Por qué?

8. app[_dev].php
Controlador frontal

9. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

10. bootstrap.php.cache
Clases/namespaces en
un único fichero.

11. bootstrap.php.cache
// app/bootstrap.php.cache
namespace { require_once __DIR__.'/autoload.php'; }
namespace SymfonyComponentDependencyInjection
{
interface ContainerAwareInterface
{
function setContainer(ContainerInterface $container = null);
}
...
}

12. bootstrap.php.cache
Reduce operaciones I/O

13. bootstrap.php.cache
Carga autoload.php

14. autoload.php
// app/autoload.php
use SymfonyComponentClassLoaderUniversalClassLoader;
$loader = new UniversalClassLoader();
$loader->registerNamespaces(array(
'Symfony' => array(
__DIR__.'/../vendor/symfony/src',
__DIR__.'/../vendor/bundles'),
'Assetic' => __DIR__.'/../vendor/assetic/src',
));
$loader->registerPrefixes(array(
'Twig_' => __DIR__.'/../vendor/twig/lib',
));

15. ClassLoader
Autoload de
clases/interfaces en
Symfony2

16. ClassLoader

17. ClassLoader
Implementa PSR-0

18. PSR-0
Aprobado por el “Framework Interop Group”
github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md

19. PSR-0
Fully Qualified Name
SymfonyCoreRequest
ZendMailMessage
[vendor_path]/Symfony/Core/Request.php
[vendor_path]/Zend/Mail/Message.php
Filesystem

20. ClassLoader
// namespaced class name
$namespace = substr($class, 0, $pos);
foreach ($this->namespaces as $ns => $dirs) {
if (0 !== strpos($namespace, $ns)) {
continue;
}
foreach ($dirs as $dir) {
$className = substr($class, $pos + 1);
$file = $dir . DIR_SEPARATOR .
str_replace('',DIR_SEPARATOR, $namespace) .
DIR_SEPARATOR .
str_replace('_', DIR_SEPARATOR, $className) . '.php';
if (file_exists($file)) {
return $file;
}
}
}

21. ClassLoader
$loader->findFile(
'SymfonyComponentHttpFoundationRequest'
);
/Sites/desymfony/app/../vendor/symfony/src/
Symfony/Component/HttpFoundation/Request.php

22. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

23. AppKernel.php
// src/AppKernel.php
use SymfonyComponentHttpKernelKernel;
use SymfonyComponentConfigLoaderLoaderInterface;
class AppKernel extends Kernel
{
public function registerBundles()
{
$bundles = array(
new SymfonyBundleTwigBundleTwigBundle(),
...
);
return $bundles;
}
public function registerContainerConfiguration(LoaderInterface $loader)
{
$loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
}
}

24. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();
Debug
Environment

25. AppKernel.php
If (true === $debug) {
Guarda inicio petición (microtime)
display_errors = 1
error_reporting = -1
DebugUniversalClassLoader
} else {
display_errors = 0
}

26. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

27. LoadClassCache
Objetivo: mapear FQN y
paths de las principales
clases/interfaces

28. LoadClassCache
Se cachea en
classes.map y
classes.php.meta

29. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

30. Request
Componente
HttpFoundation

31. Request
Abstracción OO de
una petición HTTP

32. Request
Request
GET /index.php HTTP/1.1␍␊
Host: test.com␍␊ $_GET
query
Accept-Language:en;q=0.8␍␊
request
Accept-Encoding:gzip␍␊ $_POST
cookies
User-Agent: Mozilla/5.0␍␊
␍␊ files
$_COOKIE
server
headers
$_FILES
getHost
$_SERVER
getClientIp
...

33. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

34. HttpKernel
Corazón de Symfony

35. HttpKernel
Gestiona entorno
formado por bundles,
DIC...

36. $kernel->boot()
Inicialización de
bundles y DIC

37. $kernel->initializeBundles()
Se cargan los bundles
definidos en
AppKernel::registerBundles()

38. $kernel->initializeContainer()
Se genera usando el
ContainerBuilder del
DependencyInjection

39. ContainerBuilder
// example.com/src/container.php
use SymfonyComponentDependencyInjection;
use SymfonyComponentDependencyInjectionReference;
$sc = new DependencyInjectionContainerBuilder();
$sc->register('context', 'SymfonyComponentRoutingRequestContext');
$sc->register('matcher', 'SymfonyComponentRoutingMatcherUrlMatcher')
->setArguments(array($routes, new Reference('context')));
$sc->register('framework', 'SimplexFramework')
->setArguments(array(new Reference('dispatcher'), new
Reference('resolver'))) ;
http://fabien.potencier.org/article/62/create-your-own-framework-on-top-of-the-symfony2-components-part-12

40. $kernel->initializeContainer()
{rootDir}{Environment}
[Debug]ProjectContainer

41. $kernel->initializeContainer()
Por cada bundle se ejecuta
Bundle::build() y se
registran sus extensiones

42. $kernel->boot()
Por cada bundle se asigna
el 'container' y se ejecuta
el boot()

43. $kernel->handle()
Objetivo: Devolver un
objeto Response

44. Evento kernel.request
Se lanza en cuanto
llega la petición

45. Evento kernel.request
Un listener puede
devolver un Response
y 'finalizar' la ejecución

46. Evento kernel.request
FrameworkBundle lo
utiliza para rellenar el
valor de _controller

47. RouterListener
Utiliza un RouterMatcher
(autogenerado por comp.
Routing)

48. RouterListener
// app/cache/dev/appdevUrlMatcher.php
class appdevUrlMatcher extends RedirectableUrlMatcher
{
...
public function match($pathinfo)
{
...
// _demo_hello
if (0 === strpos($pathinfo, '/demo/hello') &&
preg_match('#^/demo/hello/(?P<name>[^/]+?)$#s', $pathinfo, $m)) {
return array_merge($this->mergeDefaults($m, array(
'_controller' => 'AcmeDemoBundleControllerDemoController::helloAction')
), array( '_route' => '_demo_hello'));
}
...
}

49. ControllerResolver
Encargado de devolver un
controlador + argumentos
a partir de _controller

50. FrameworkBundle
Agrupa componentes y
librerías para crear un
framework MVC

51. FrameworkBundle
Además, ofrece...

52. FrameworkBundle
php app/console

53. FrameworkBundle
// app/console
#!/usr/bin/env php
<?php
require_once __DIR__.'/bootstrap.php.cache';
require_once __DIR__.'/AppKernel.php';
use SymfonyBundleFrameworkBundleConsoleApplication;
use SymfonyComponentConsoleInputArgvInput;
$input = new ArgvInput();
$env = $input->getParameterOption(array('--env', '-e'), getenv('SYMFONY_ENV') ?: 'dev');
$debug = !$input->hasParameterOption(array('--no-debug', ''));
$kernel = new AppKernel($env, $debug);
$application = new Application($kernel);
$application->run();

54. FrameworkBundle
Comandos
assets:install
cache:clear
cache:warmup
container:debug
router:dump-apache
router:debug

55. FrameworkBundle
Controller

56. FrameworkBundle
// src/Acme/DemoBundle/Controller/DemoController
namespace AcmeDemoBundleController;
use SymfonyBundleFrameworkBundleControllerController;
class DemoController extends Controller
{
public function helloAction($name)
{
...
}
}

57. FrameworkBundle
Y mucho más: ESI,
WebTestCase,
DataCollectors...

58. Evento kernel.controller
Una vez definido el
controlador, se lanza el
evento

59. Evento kernel.controller
Se puede cambiar,
pasando un Callable

60. Evento kernel.view
Se lanza si el Controller
no devuelve un objeto
Response

61. Evento kernel.view
Objetivo: construir un
objeto Response del
return del Controller

62. Evento kernel.response
Permite reemplazar o
modificar el objeto
Response

63. Evento kernel.exception
Oportunidad para
convertir una Exception
en un Response

64. Eventos
Todos heredan de
KernelEvent
getRequestType(): MASTER_REQUEST o SUB_REQUEST
getKernel();
getRequest();

65. Response
Response
HTTP/1.1 200 OK
Headers Content-type: text/html
Date:Thu, 31 May 2012 17:54:50 GMT
Version
Content <!DOCTYPE HTML>
<html lang="es">
<head>
Status code
<meta charset="utf-8">
...
Status text
Charset

66. app[_dev].php
// web/app[_env].php
1. require_once __DIR__.'/../app/bootstrap.php.cache';
2. require_once __DIR__.'/../app/AppKernel.php';
3. use SymfonyComponentHttpFoundationRequest;
4. $kernel = new AppKernel('dev', true);
5. $kernel->loadClassCache();
6. $kernel->handle(Request::createFromGlobals())->send();

67. Response::send()
Envía las cabeceras y el
contenido

68. Response::send()

69. Demo
https://github.com/raulfraile/
internals-desymfony2012

70. ¡Gracias!

71. Fotografías
http://www.flickr.com/photos/connectirmeli/7233514862
http://www.flickr.com/photos/barretthall/6070677596
http://www.flickr.com/photos/f-oxymoron/5005673112/

72. ¿Preguntas?