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<?php |
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/* |
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* Go! AOP framework |
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* |
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* @copyright Copyright 2012, Lisachenko Alexander <[email protected]> |
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* |
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* This source file is subject to the license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Go\Instrument\Transformer; |
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use Go\Core\AspectKernel; |
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use Go\Instrument\ClassLoading\CachePathManager; |
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/** |
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* Caching transformer that is able to take the transformed source from a cache |
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*/ |
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class CachingTransformer extends BaseSourceTransformer |
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{ |
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/** |
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* Mask of permission bits for cache files. |
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* By default, permissions are affected by the umask system setting |
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* |
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* @var integer|null |
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*/ |
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protected $cacheFileMode; |
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/** |
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* @var array|callable|SourceTransformer[] |
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*/ |
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protected $transformers = []; |
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/** |
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* @var CachePathManager|null |
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*/ |
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protected $cacheManager; |
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/** |
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* Class constructor |
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* |
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* @param AspectKernel $kernel Instance of aspect kernel |
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* @param array|callable $transformers Source transformers or callable that should return transformers |
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* @param CachePathManager $cacheManager Cache manager |
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*/ |
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public function __construct(AspectKernel $kernel, $transformers, CachePathManager $cacheManager) |
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{ |
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parent::__construct($kernel); |
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$this->cacheManager = $cacheManager; |
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$this->cacheFileMode = $this->options['cacheFileMode']; |
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$this->transformers = $transformers; |
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} |
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/** |
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* This method may transform the supplied source and return a new replacement for it |
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* |
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* @param StreamMetaData $metadata Metadata for source |
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* @return bool Return false if transformation should be stopped |
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*/ |
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public function transform(StreamMetaData $metadata) |
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{ |
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// Do not create a cache |
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if (!$this->cacheManager->getCacheDir()) { |
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return $this->processTransformers($metadata); |
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} |
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$originalUri = $metadata->uri; |
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$wasProcessed = false; |
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$cacheUri = $this->cacheManager->getCachePathForResource($originalUri); |
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// Guard to disable overwriting of original files |
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if ($cacheUri === $originalUri) { |
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return false; |
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} |
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$lastModified = filemtime($originalUri); |
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$cacheState = $this->cacheManager->queryCacheState($originalUri); |
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$cacheModified = $cacheState ? $cacheState['filemtime'] : 0; |
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if ($cacheModified < $lastModified |
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|| (isset($cacheState['cacheUri']) && $cacheState['cacheUri'] !== $cacheUri) |
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|| !$this->container->isFresh($cacheModified) |
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) { |
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$wasProcessed = $this->processTransformers($metadata); |
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if ($wasProcessed) { |
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$parentCacheDir = dirname($cacheUri); |
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if (!is_dir($parentCacheDir)) { |
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mkdir($parentCacheDir, $this->cacheFileMode, true); |
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} |
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file_put_contents($cacheUri, $metadata->source, LOCK_EX); |
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// For cache files we don't want executable bits by default |
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chmod($cacheUri, $this->cacheFileMode & (~0111)); |
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} |
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$this->cacheManager->setCacheState($originalUri, array( |
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'filemtime' => isset($_SERVER['REQUEST_TIME']) ? $_SERVER['REQUEST_TIME'] : time(), |
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'cacheUri' => $wasProcessed ? $cacheUri : null |
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)); |
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return $wasProcessed; |
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} |
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if ($cacheState) { |
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$wasProcessed = isset($cacheState['cacheUri']); |
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} |
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if ($wasProcessed) { |
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$metadata->source = file_get_contents($cacheUri); |
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} |
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return $wasProcessed; |
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} |
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/** |
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* Iterates over transformers |
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* |
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* @param StreamMetaData $metadata Metadata for source code |
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* @return bool False, if transformation should be stopped |
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*/ |
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private function processTransformers(StreamMetaData $metadata) |
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{ |
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if (is_callable($this->transformers)) { |
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$delayedTransformers = $this->transformers; |
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$this->transformers = $delayedTransformers(); |
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} |
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foreach ($this->transformers as $transformer) { |
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$isTransformed = $transformer->transform($metadata); |
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// transformer reported about termination, next transformers will be skipped |
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if ($isTransformed === false) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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goaop /
framework
