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<?php |
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declare( strict_types = 1 ); |
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5
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namespace FileFetcher; |
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use Psr\SimpleCache\CacheException; |
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use Psr\SimpleCache\CacheInterface; |
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/** |
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* Decorator that caches files using psr/simple-cache. |
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* https://packagist.org/packages/psr/simple-cache |
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* |
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* @since 5.0 |
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* |
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* @licence BSD-3-Clause |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class PsrCacheFileFetcher implements FileFetcher { |
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private $fileFetcher; |
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private $cache; |
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private $keyBuilder; |
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/** |
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* @param FileFetcher $fileFetcher |
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* @param CacheInterface $cache |
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* @param callable|null $keyBuilderFunction Gets the fileUrl (string) and needs to return a valid cache key (string) |
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*/ |
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public function __construct( FileFetcher $fileFetcher, CacheInterface $cache, callable $keyBuilderFunction = null ) { |
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$this->fileFetcher = $fileFetcher; |
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$this->cache = $cache; |
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$this->keyBuilder = $keyBuilderFunction ?? $this->getDefaultKeyBuilder(); |
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} |
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private function getDefaultKeyBuilder(): callable { |
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return function( string $fileUrl ): string { |
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return preg_replace( |
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'/[^A-Za-z0-9\-]/', |
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'_', |
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$fileUrl |
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) |
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. '-' . substr( sha1( $fileUrl ), 0, 5 ); |
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}; |
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} |
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/** |
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* @see FileFetcher::fetchFile |
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* @throws FileFetchingException |
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*/ |
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public function fetchFile( string $fileUrl ): string { |
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$fileContents = $this->getFileContentsFromCache( $fileUrl ); |
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if ( $fileContents === null ) { |
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return $this->retrieveAndCacheFile( $fileUrl ); |
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} |
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return $fileContents; |
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} |
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private function getFileContentsFromCache( string $fileUrl ): ?string { |
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try { |
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return $this->cache->get( $this->createCacheKey( $fileUrl ) ); |
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} |
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1 |
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catch ( CacheException $ex ) { |
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return null; |
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} |
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} |
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private function createCacheKey( string $fileUrl ): string { |
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return ( $this->keyBuilder )( $fileUrl ); |
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} |
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private function retrieveAndCacheFile( $fileUrl ): string { |
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$fileContents = $this->fileFetcher->fetchFile( $fileUrl ); |
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try { |
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$this->cache->set( $this->createCacheKey( $fileUrl ), $fileContents ); |
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} |
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1 |
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catch ( CacheException $ex ) { |
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} |
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return $fileContents; |
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} |
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} |
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JeroenDeDauw /
FileFetcher
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