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Into the kernel and back Jakub Zalas Lisbon, 8.03.2014

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Olá! I work @SensioLabsUK I tweet @jakub_zalas I code @jakzal

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HttpKernelInterface

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namespace Symfony\Component\HttpKernel; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; interface HttpKernelInterface { const MASTER_REQUEST = 1; const SUB_REQUEST = 2; /** * @return Response */ public function handle( Request $request, $type = self::MASTER_REQUEST, $catch = true ); }

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namespace Symfony\Component\HttpKernel; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; interface HttpKernelInterface { const MASTER_REQUEST = 1; const SUB_REQUEST = 2; /** * @return Response */ public function handle( Request $request, $type = self::MASTER_REQUEST, $catch = true ); }

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Request Response /hello/sfdaypt

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$response = $kernel->handle($request);

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use Symfony\Component\HttpFoundation\Request; $request = Request::createFromGlobals(); $kernel = new SimpleKernel(); $response = $kernel->handle($request); $response->send();

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use Symfony\Component\HttpKernel\HttpKernelInterface; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; class SimpleKernel implements HttpKernelInterface { public function handle(Request $request /*,...*/) { return new Response('Hello Portugal'); } }

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use Symfony\Component\HttpKernel\HttpKernelInterface; use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; class SimpleKernel implements HttpKernelInterface { public function handle(Request $request /*,...*/) { return new Response('Hello Portugal'); } }

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Routing

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Request Response callable   callable   callable   callable   / /hello/{name} /contact /events Router /hello/sfdaypt

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public function handle(Request $request /*,...*/) { $controller = $this->matchRequest($request); $response = call_user_func($controller): return $response; } private function matchRequest(Request $request) { $map = array( '/' => array(new Homepage(), 'indexAction'), '/contact' => array(new Contact(), 'formAction') ); return $map[$request->getPathInfo()]; }

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public function handle(Request $request /*,...*/) { $controller = $this->matchRequest($request); $response = call_user_func($controller): return $response; } private function matchRequest(Request $request) { $map = array( '/' => array(new Homepage(), 'indexAction'), '/contact' => array(new Contact(), 'formAction') ); return $map[$request->getPathInfo()]; }

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private function matchRequest(Request $request) { $routes = $this->getRoutes(); $context = new RequestContext(); $context->fromRequest($request); $urlMatcher = new UrlMatcher($routes, $context); return $urlMatcher->matchRequest($request); } private function getRoutes() { $routes = new RouteCollection(); $routes->add('homepage', new Route('/', array('_controller' => 'Homepage::indexAction'))); $routes->add('contact', new Route('/', array('_controller' => 'Contact::formAction'))); return $routes; }

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private function matchRequest(Request $request) { $routes = $this->getRoutes(); $context = new RequestContext(); $context->fromRequest($request); $urlMatcher = new UrlMatcher($routes, $context); return $urlMatcher->matchRequest($request); } private function getRoutes() { $routes = new RouteCollection(); $routes->add('homepage', new Route('/', array('_controller' => 'Homepage::indexAction'))); $routes->add('contact', new Route('/', array('_controller' => 'Contact::formAction'))); return $routes; }

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private function matchRequest(Request $request) { $routes = $this->getRoutes(); $context = new RequestContext(); $context->fromRequest($request); $urlMatcher = new UrlMatcher($routes, $context); return $urlMatcher->matchRequest($request); } private function getRoutes() { $routes = new RouteCollection(); $routes->add('homepage', new Route('/', array('_controller' => 'Homepage::indexAction'))); $routes->add('contact', new Route('/', array('_controller' => 'Contact::formAction'))); return $routes; }

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hello: path: /hello/{name} defaults: _controller: 'DemoController::helloAction'

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private function getRoutes() { $locator = new FileLocator(array(__DIR__)); $loader = new YamlFileLoader($locator); $routes = $loader->load('routes.yml'); return $routes; }

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public function handle(Request $request /*,...*/) { // ['_controller' => 'Homepage::indexAction'] $parameters = $this->matchRequest($request); // [new Homepage(), 'indexAction'] $controller = ??? $response = call_user_func($controller): return $response; }

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Controller resolver

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Request Response callable   callable   callable   callable   / /hello/{name} /contact /events Router /hello/sfdaypt Controller Resolver

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public function handle(Request $request /*,...*/) { $parameters = $this->matchRequest($request); $controller = $this->resolveController($parameters); $response = call_user_func($controller): return $response; } private function resolveController($parameters) { // i.e. Homepage::indexAction $controller = $parameters['_controller']; list($class, $method) = explode('::', $controller); $controller = new $class(); return array($class, $method); }

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public function handle(Request $request /*,...*/) { $parameters = $this->matchRequest($request); $controller = $this->resolveController($parameters); $response = call_user_func($controller): return $response; } private function resolveController($parameters) { // i.e. Homepage::indexAction $controller = $parameters['_controller']; list($class, $method) = explode('::', $controller); $controller = new $class(); return array($class, $method); }

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public function handle(Request $request /*,...*/) { $parameters = $this->matchRequest($request); $controller = $this->resolveController($parameters); $response = call_user_func($controller): return $response; } private function resolveController($parameters) { // i.e. Homepage::indexAction $controller = $parameters['_controller']; list($class, $method) = explode('::', $controller); $controller = new $class(); return array($class, $method); }

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use Symfony\Component\Routing\Matcher\RequestMatcherInterface; use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface; public function __construct( RequestMatcherInterface $matcher, ControllerResolverInterface $resolver ) { $this->matcher = $matcher; $this->resolver = $resolver; }

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public function handle(Request $request /*,...*/) { $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); $controller = $this->resolver->resolve($request); $response = call_user_func($controller): return $response; }

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public function handle(Request $request /*,...*/) { $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); $controller = $this->resolver->resolve($request); $response = call_user_func($controller): return $response; }

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EventDispatcherInterface

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Handle Request Execute  a   controller   Geoip  lookup   Mobile   redirect   Authen6cate   ?   ?   Add     debug  to   response   ?   Match  a   request  

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Request Response Router Controller Resolver Event Dispatcher GeoipListener SessionListener LocaleListener Firewall kernel.request TemplateListener ControllerListener ParamConverter Listener TemplateListener

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Request Response Router Controller Resolver Event Dispatcher GeoipListener SessionListener LocaleListener Firewall kernel.request TemplateListener ControllerListener ParamConverter Listener TemplateListener

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use Symfony\Component\EventDispatcher\EventDispatcherInterface; use Symfony\Component\Routing\Matcher\RequestMatcherInterface; use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface; public function __construct( EventDispatcherInterface $dispatcher, RequestMatcherInterface $matcher, ControllerResolverInterface $resolver ) { $this->eventDispatcher = $dispatcher; $this->matcher = $matcher; $this->resolver = $resolver; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); $controller = $this->resolver->resolve($request); $response = call_user_func($controller): return $response; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); $controller = $this->resolver->resolve($request); $response = call_user_func($controller): return $response; }

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Request Response Router Controller Resolver Event Dispatcher GeoipListener SessionListener LocaleListener Firewall kernel.request

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Request Response Controller Resolver Event Dispatcher kernel.request GeoipListener SessionListener LocaleListener RouterListener Firewall

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use Symfony\Component\EventDispatcher\EventDispatcherInterface; use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface; public function __construct( EventDispatcherInterface $dispatcher, ControllerResolverInterface $resolver ) { $this->eventDispatcher = $dispatcher; $this->resolver = $resolver; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); $controller = $this->resolver->resolve($request); $response = call_user_func($controller): return $response; }

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class RouterListener { public function __construct( RequestMatcherInterface $matcher ) { $this->matcher = $matcher } function onKernelRequest(GetResponseEvent $event) { // ... } }

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// RouterListener public function onKernelRequest(GetResponseEvent $event) { $request = $event->getRequest(); if ($request->attributes->has('_controller')) { // routing is already done return; } $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); }

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// RouterListener public function onKernelRequest(GetResponseEvent $event) { $request = $event->getRequest(); if ($request->attributes->has('_controller')) { // routing is already done return; } $parameters = $this->matcher->matchRequest($request); $request->attributes->add($parameters); }

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Request Response Controller Resolver Event Dispatcher kernel.request GeoipListener SessionListener LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher kernel.request GeoipListener SessionListener LocaleListener RouterListener Firewall

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// RedirectListener public function onKernelRequest(GetResponseEvent $event) { $event->setResponse( new RedirectResponse('http://www.symfonyday.pt/') ); }

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// HttpKernel public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); if ($event->hasResponse()) { return $event->getResponse(); } $controller = $this->resolver->resolve($request); $response = call_user_func($controller); return $response; }

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Request Response Controller Resolver Event Dispatcher kernel.response CacheListener ResponseListener ProfilerListener WebDebugToolbar Listener

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Request Response Controller Resolver Event Dispatcher kernel.finish_request LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher kernel.finish_request LocaleListener RouterListener Firewall

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); if ($event->hasResponse()) { return $this->filterResponse($event->getResponse(), $request, $type); } $controller = $this->resolver->resolve($request); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); } private function filterResponse(Response $response, Request $request, $type) { $event = new FilterResponseEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch('kernel.response', $event); $response = $event->getResponse(); $event = new FinishRequestEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.finish_request', $event); return $response; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); if ($event->hasResponse()) { return $this->filterResponse($event->getResponse(), $request, $type); } $controller = $this->resolver->resolve($request); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); } private function filterResponse(Response $response, Request $request, $type) { $event = new FilterResponseEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch('kernel.response', $event); $response = $event->getResponse(); $event = new FinishRequestEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.finish_request', $event); return $response; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); if ($event->hasResponse()) { return $this->filterResponse($event->getResponse(), $request, $type); } $controller = $this->resolver->resolve($request); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); } private function filterResponse(Response $response, Response $response, $type) { $event = new FilterResponseEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch('kernel.response', $event); $response = $event->getResponse(); $event = new FinishRequestEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.finish_request', $event); return $response; }

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public function handle(Request $request, $type, $catch) { $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.request', $event); if ($event->hasResponse()) { return $this->filterResponse($event->getResponse(), $request, $type); } $controller = $this->resolver->resolve($request); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); } private function filterResponse(Response $response, Response $response, $type) { $event = new FilterResponseEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch('kernel.response', $event); $response = $event->getResponse(); $event = new FinishRequestEvent($this, $request, $type); $this->dispatcher->dispatch('kernel.finish_request', $event); return $response; }

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Request Response Controller Resolver Event Dispatcher ControllerListener kernel.controller RequestDataCollector Listener ParamConverter Listener TemplateListener

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public function handle(Request $request, $type, $catch) { // ... $controller = $this->resolver->resolve($request); $event = new FilterControllerEvent( $this, $controller, $request, $type ); $this->dispatcher->dispatch( 'kernel.controller', $event ); $controller = $event->getController(); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); }

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public function handle(Request $request, $type, $catch) { // ... $controller = $this->resolver->resolve($request); $event = new FilterControllerEvent( $this, $controller, $request, $type ); $this->dispatcher->dispatch( 'kernel.controller', $event ); $controller = $event->getController(); $response = call_user_func($controller); return $this->filterResponse($response, $request, $type); }

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public function handle(Request $request, $type, $catch) { // ... $controller = $this->resolver->resolve($request); $event = new FilterControllerEvent( $this, $controller, $request, $type ); $this->dispatcher->dispatch('kernel.controller', $event); $controller = $event->getController(); $arguments = $this->resolver->getArguments( $request, $controller ); $response = call_user_func($controller, $arguments); return $this->filterResponse($response, $request, $type); }

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Request Response Controller Resolver Event Dispatcher TemplateListener kernel.view

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public function handle(Request $request, $type, $catch) { // ... $response = call_user_func($controller, $arguments); if (!$response instance of Response) { $event = new GetResponseForControllerResultEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch( 'kernel.view', $event ); $response = $event->getResponse(); } return $this->filterResponse($response, $request, $type); }

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public function handle(Request $request, $type, $catch) { // ... $response = call_user_func($controller, $arguments); if (!$response instance of Response) { $event = new GetResponseForControllerResultEvent( $this, $request, $type, $response ); $this->dispatcher->dispatch( 'kernel.view', $event ); $response = $event->getResponse(); } return $this->filterResponse($response, $request, $type); }

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Build-in events

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The usual path

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Request Response Controller Resolver Event Dispatcher kernel.request FragmentListener SessionListener LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher ControllerListener kernel.controller RequestDataCollector Listener ParamConverter Listener TemplateListener

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Request Response Controller Resolver Event Dispatcher kernel.response CacheListener ResponseListener ProfilerListener WebDebugToolbar Listener

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Request Response Controller Resolver Event Dispatcher kernel.finish_request LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher TemplateListener kernel.view

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Request Response Controller Resolver Event Dispatcher kernel.terminate ProfilerListener EmailSenderListener

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A Response set during kernel.request

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Request Response Controller Resolver Event Dispatcher kernel.request FragmentListener SessionListener LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher kernel.response CacheListener ResponseListener ProfilerListener WebDebugToolbar Listener

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Request Response Controller Resolver Event Dispatcher kernel.finish_request LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher kernel.finish_request LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher kernel.terminate TraceableEvent Dispatcher ProfilerListener EmailSenderListener

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An exception thrown during handling a request

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Request Response Controller Resolver Event Dispatcher kernel.request FragmentListener SessionListener LocaleListener RouterListener Firewall

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Request Response Controller Resolver Event Dispatcher ExceptionListener AccessDeniedListener ProfilerListener kernel.exception

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Symfony\Component\HttpKernel\HttpKernel Read more...

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KernelInterface

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interface KernelInterface extends HttpKernelInterface, \Serializable { public function registerBundles(); public function registerContainerConfiguration( LoaderInterface $loader); public function boot(); public function shutdown(); public function getBundles(); public function isClassInActiveBundle($class); public function getBundle($name, $first = true); public function locateResource($name, $dir = null, $first = true); public function getName(); public function getEnvironment(); public function isDebug(); public function getRootDir(); public function getContainer(); public function getStartTime(); public function getCacheDir(); public function getLogDir(); public function getCharset(); }

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H

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H

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class Kernel implements KernelInterface { public function handle( Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true) ) { if (false === $this->booted) { $this->boot(); } return $this->container->get('http_kernel') ->handle($request, $type, $catch); } }

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class Kernel implements KernelInterface { public function handle( Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true) ) { if (false === $this->booted) { $this->boot(); } return $this->container->get('http_kernel') ->handle($request, $type, $catch); } }

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class Kernel implements KernelInterface { public function handle( Request $request, $type = HttpKernelInterface::MASTER_REQUEST, $catch = true) ) { if (false === $this->booted) { $this->boot(); } return $this->container->get('http_kernel') ->handle($request, $type, $catch); } }

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public function boot() { $this->initializeBundles(); $this->initializeContainer(); foreach ($this->getBundles() as $bundle) { $bundle->setContainer($this->container); $bundle->boot(); } $this->booted = true; }

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protected function initializeContainer() { // ... if (!$cache->isFresh()) { $container = $this->buildContainer(); $container->compile(); $this->dumpContainer($cache, $container/*…*/); } require_once $cache; $this->container = new $class(); $this->container->set('kernel', $this); // ... }

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protected function initializeContainer() { // ... if (!$cache->isFresh()) { $container = $this->buildContainer(); $container->compile(); $this->dumpContainer($cache, $container/*…*/); } require_once $cache; $this->container = new $class(); $this->container->set('kernel', $this); // ... }

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class appDevDebugProjectContainer extends Container { // ... protected function getLoggerService() { $this->services['logger'] = $instance = new \Symfony\Bridge\Monolog\Logger('app'); $instance->pushHandler($this->get('monolog.handler.console')); $instance->pushHandler($this->get('monolog.handler.main')); $instance->pushHandler($this->get('monolog.handler.debug')); return $instance; } // ... }

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protected function initializeContainer() { // ... if (!$cache->isFresh()) { $container = $this->buildContainer(); $container->compile(); $this->dumpContainer($cache, $container/*…*/); } require_once $cache; $this->container = new $class(); $this->container->set('kernel', $this); // ... }

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protected function initializeContainer() { // ... if (!$cache->isFresh()) { $container = $this->buildContainer(); $container->compile(); $this->dumpContainer($cache, $container/*…*/); } require_once $cache; $this->container = new $class(); $this->container->set('kernel', $this); // ... }

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Container and events in a legacy application

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$kernel = new \AppKernel('dev', true); $kernel->boot(); $request = Request::createFromGlobals(); $request->attributes->set('is_legacy', true); $container = $kernel->getContainer(); $container->enterScope('request'); $container->get('request_stack')->push($request); $event = new GetResponseEvent( $kernel, $request, HttpKernelInterface::MASTER_REQUEST ); $container->get('event_dispatcher'); ->dispatch('kernel.request', $event);

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$kernel = new \AppKernel('dev', true); $kernel->boot(); $request = Request::createFromGlobals(); $request->attributes->set('is_legacy', true); $container = $kernel->getContainer(); $container->enterScope('request'); $container->get('request_stack')->push($request); $event = new GetResponseEvent( $kernel, $request, HttpKernelInterface::MASTER_REQUEST ); $container->get('event_dispatcher'); ->dispatch('kernel.request', $event);

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$kernel = new \AppKernel('dev', true); $kernel->boot(); $request = Request::createFromGlobals(); $request->attributes->set('is_legacy', true); $container = $kernel->getContainer(); $container->enterScope('request'); $container->get('request_stack')->push($request); $event = new GetResponseEvent( $kernel, $request, HttpKernelInterface::MASTER_REQUEST ); $container->get('event_dispatcher'); ->dispatch('kernel.request', $event);

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$kernel = new \AppKernel('dev', true); $kernel->boot(); $request = Request::createFromGlobals(); $request->attributes->set('is_legacy', true); $container = $kernel->getContainer(); $container->enterScope('request'); $container->get('request_stack')->push($request); $event = new GetResponseEvent( $kernel, $request, HttpKernelInterface::MASTER_REQUEST ); $container->get('event_dispatcher'); ->dispatch('kernel.request', $event);

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$kernel = new \AppKernel('dev', true); $kernel->boot(); $request = Request::createFromGlobals(); $request->attributes->set('is_legacy', true); $container = $kernel->getContainer(); $container->enterScope('request'); $container->get('request_stack')->push($request); $event = new GetResponseEvent( $kernel, $request, HttpKernelInterface::MASTER_REQUEST ); $container->get('event_dispatcher'); ->dispatch('kernel.request', $event);

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class RouterListener extends BaseRouterListener { public function onKernelRequest( GetResponseEvent $event ) { $request = $event->getRequest(); try { parent::onKernelRequest($event); } catch (NotFoundHttpException $e) { if (!$request->attributes->get('is_legacy')) { throw $e; } } } }

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Thank you! https://joind.in/10782