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Kernel.php
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Kernel.php
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<?php
namespace Symfony\Foundation;
use Symfony\Components\DependencyInjection\ContainerInterface;
use Symfony\Components\DependencyInjection\Builder;
use Symfony\Components\DependencyInjection\BuilderConfiguration;
use Symfony\Components\DependencyInjection\Dumper\PhpDumper;
use Symfony\Components\DependencyInjection\FileResource;
use Symfony\Components\RequestHandler\Request;
use Symfony\Components\RequestHandler\RequestHandlerInterface;
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* The Kernel is the heart of the Symfony system. It manages an environment
* that can host bundles.
*
* @package Symfony
* @subpackage Foundation
* @author Fabien Potencier <fabien.potencier@symfony-project.org>
*/
abstract class Kernel implements RequestHandlerInterface, \Serializable
{
protected $bundles;
protected $bundleDirs;
protected $container;
protected $rootDir;
protected $environment;
protected $debug;
protected $booted;
protected $name;
protected $startTime;
protected $request;
const VERSION = '2.0.0-DEV';
/**
* Constructor.
*
* @param string $environment The environment
* @param Boolean $debug Whether to enable debugging or not
*/
public function __construct($environment, $debug)
{
$this->environment = $environment;
$this->debug = (Boolean) $debug;
$this->booted = false;
$this->rootDir = realpath($this->registerRootDir());
$this->name = basename($this->rootDir);
if ($this->debug)
{
ini_set('display_errors', 1);
error_reporting(-1);
$this->startTime = microtime(true);
}
else
{
ini_set('display_errors', 0);
}
}
abstract public function registerRootDir();
abstract public function registerBundles();
abstract public function registerBundleDirs();
abstract public function registerContainerConfiguration();
abstract public function registerRoutes();
/**
* Checks whether the current kernel has been booted or not.
*
* @return boolean $booted
*/
public function isBooted()
{
return $this->booted;
}
/**
* Boots the current kernel.
*
* This method boots the bundles, which MUST set
* the DI container.
*
* @return Kernel The current Kernel instance
*
* @throws \LogicException When the Kernel is already booted
*/
public function boot()
{
if (true === $this->booted)
{
throw new \LogicException('The kernel is already booted.');
}
$this->bundles = $this->registerBundles();
$this->bundleDirs = $this->registerBundleDirs();
// initialize the container
$this->container = $this->initializeContainer();
$this->container->setService('kernel', $this);
// boot bundles
foreach ($this->bundles as $bundle)
{
$bundle->boot($this->container);
}
$this->booted = true;
return $this;
}
/**
* Shutdowns the kernel.
*
* This method is mainly useful when doing functional testing.
*/
public function shutdown()
{
$this->booted = false;
foreach ($this->bundles as $bundle)
{
$bundle->shutdown($this->container);
}
$this->container = null;
}
/**
* Reboots the kernel.
*
* This method is mainly useful when doing functional testing.
*
* It is a shortcut for the call to shutdown() and boot().
*/
public function reboot()
{
$this->shutdown();
$this->boot();
}
/**
* Gets the Request instance associated with the main request.
*
* @return Request A Request instance
*/
public function getRequest()
{
return $this->request;
}
public function handle(Request $request = null, $main = true)
{
if (false === $this->booted)
{
$this->boot();
}
if (null === $request)
{
$request = $this->container->getRequestService();
}
else
{
$this->container->setService('request', $request);
}
if (true === $main)
{
$this->request = $request;
}
return $this->container->getRequestHandlerService()->handle($request);
}
public function getBundleDirs()
{
return $this->bundleDirs;
}
public function getBundles()
{
return $this->bundles;
}
public function getName()
{
return $this->name;
}
public function getEnvironment()
{
return $this->environment;
}
public function isDebug()
{
return $this->debug;
}
public function getRootDir()
{
return $this->rootDir;
}
public function getContainer()
{
return $this->container;
}
public function getStartTime()
{
return $this->debug ? $this->startTime : -INF;
}
public function getCacheDir()
{
return $this->rootDir.'/cache/'.$this->environment;
}
public function getLogDir()
{
return $this->rootDir.'/logs';
}
protected function initializeContainer()
{
$class = $this->name.'ProjectContainer';
$location = $this->getCacheDir().'/'.$class;
$reload = $this->debug ? $this->needsReload($class, $location) : false;
if ($reload || !file_exists($location.'.php'))
{
$this->buildContainer($class, $location.'.php');
}
require_once $location.'.php';
return new $class();
}
public function getKernelParameters()
{
$bundles = array();
foreach ($this->bundles as $bundle)
{
$bundles[] = get_class($bundle);
}
return array_merge(
array(
'kernel.root_dir' => $this->rootDir,
'kernel.environment' => $this->environment,
'kernel.debug' => $this->debug,
'kernel.name' => $this->name,
'kernel.cache_dir' => $this->getCacheDir(),
'kernel.logs_dir' => $this->getLogDir(),
'kernel.bundle_dirs' => $this->bundleDirs,
'kernel.bundles' => $bundles,
'kernel.charset' => 'UTF-8',
),
$this->getEnvParameters()
);
}
protected function getEnvParameters()
{
$parameters = array();
foreach ($_SERVER as $key => $value)
{
if ('SYMFONY__' === substr($key, 0, 9))
{
$parameters[strtolower(str_replace('__', '.', substr($key, 9)))] = $value;
}
}
return $parameters;
}
protected function needsReload($class, $location)
{
if (!file_exists($location.'.meta') || !file_exists($location.'.php'))
{
return true;
}
$meta = unserialize(file_get_contents($location.'.meta'));
$time = filemtime($location.'.php');
foreach ($meta as $resource)
{
if (!$resource->isUptodate($time))
{
return true;
}
}
return false;
}
protected function buildContainer($class, $file)
{
$container = new Builder($this->getKernelParameters());
$configuration = new BuilderConfiguration();
foreach ($this->bundles as $bundle)
{
$configuration->merge($bundle->buildContainer($container));
}
$configuration->merge($this->registerContainerConfiguration());
$container->merge($configuration);
$this->optimizeContainer($container);
foreach (array('cache', 'logs') as $name)
{
$dir = $container->getParameter(sprintf('kernel.%s_dir', $name));
if (!is_dir($dir))
{
if (false === @mkdir($dir, 0777, true))
{
die(sprintf('Unable to create the %s directory (%s)', $name, dirname($dir)));
}
}
elseif (!is_writable($dir))
{
die(sprintf('Unable to write in the %s directory (%s)', $name, $dir));
}
}
// cache the container
$dumper = new PhpDumper($container);
$content = $dumper->dump(array('class' => $class));
if (!$this->debug)
{
$content = self::stripComments($content);
}
$this->writeCacheFile($file, $content);
if ($this->debug)
{
// add the Kernel class hierarchy as resources
$parent = new \ReflectionObject($this);
$configuration->addResource(new FileResource($parent->getFileName()));
while ($parent = $parent->getParentClass())
{
$configuration->addResource(new FileResource($parent->getFileName()));
}
// save the resources
$this->writeCacheFile($this->getCacheDir().'/'.$class.'.meta', serialize($configuration->getResources()));
}
}
public function optimizeContainer(Builder $container)
{
// replace all classes with the real value
foreach ($container->getDefinitions() as $definition)
{
if (false !== strpos($class = $definition->getClass(), '%'))
{
$definition->setClass(Builder::resolveValue($class, $container->getParameters()));
unset($container[substr($class, 1, -1)]);
}
}
}
static public function stripComments($source)
{
if (!function_exists('token_get_all'))
{
return $source;
}
$ignore = array(T_COMMENT => true, T_DOC_COMMENT => true);
$output = '';
foreach (token_get_all($source) as $token)
{
// array
if (isset($token[1]))
{
// no action on comments
if (!isset($ignore[$token[0]]))
{
// anything else -> output "as is"
$output .= $token[1];
}
}
else
{
// simple 1-character token
$output .= $token;
}
}
return $output;
}
protected function writeCacheFile($file, $content)
{
$tmpFile = tempnam(dirname($file), basename($file));
if (!$fp = @fopen($tmpFile, 'wb'))
{
die(sprintf('Failed to write cache file "%s".', $tmpFile));
}
@fwrite($fp, $content);
@fclose($fp);
if ($content != file_get_contents($tmpFile))
{
die(sprintf('Failed to write cache file "%s" (cache corrupted).', $tmpFile));
}
@rename($tmpFile, $file);
chmod($file, 0644);
}
public function serialize()
{
return serialize(array($this->environment, $this->debug));
}
public function unserialize($data)
{
list($environment, $debug) = unserialize($data);
$this->__construct($environment, $debug);
}
}