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<?php |
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/** |
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* Class for calling the package generator and caching the results. |
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*/ |
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class SizeRestrictedPackageCache implements PackageCache { |
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protected $cacheSize; |
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protected $baseDir; |
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/** |
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* Set the maximum number of items that will be stored in the package cache. |
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* |
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* If null, items will never be deleted. If set, cache entries will be touched whenever they are accessed, |
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* and the least-recently-access items will be deleted. |
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* |
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* @param int $cacheSize the number of package files to keep. |
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*/ |
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public function setCacheSize($cacheSize) { |
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$this->cacheSize = $cacheSize; |
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} |
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/** |
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* The base directory to store cached packages in. |
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* The files will be stored in a subdirectory named after the identifier. |
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* If base directory isn't set, the getPackageFilename() won't run. |
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* |
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* @param string $baseDir The base directory |
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*/ |
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public function setBaseDir($baseDir) { |
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$this->baseDir = realpath($baseDir); |
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} |
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/** |
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* Return the filename of the generated package, retrieving from cache or generating as necessary |
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* |
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* @param PackageGenerator $generator The generator to use to create cache entries. |
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* @param string $identifier A unique identifier for the generator; used to partition the cache |
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* @param string $sha The SHA of the commit to be deployed |
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* @param string $repositoryDir The directory where the repository resides |
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* @param DeploynautLogFile $log The log to write status output to, including package-generation commands |
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* |
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* @return string |
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*/ |
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public function getPackageFilename( |
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PackageGenerator $generator, |
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$identifier, $sha, |
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$repositoryDir, |
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DeploynautLogFile $log |
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) { |
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if(!$this->baseDir) { |
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throw new \LogicException("Can't use PackageCache without setting BaseDir"); |
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} |
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$buildPath = $this->baseDir . '/' . $this->sanitiseDirName($identifier); |
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$filename = "$buildPath/$sha.tar.gz"; |
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if(!file_exists($this->baseDir)) { |
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if(!mkdir($this->baseDir)) { |
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throw new \LogicException("Can't create base dir {$this->baseDir}"); |
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} |
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} |
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if(!file_exists($buildPath)) { |
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if(!mkdir($buildPath)) { |
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throw new \LogicException("Can't create build path $buildPath"); |
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} |
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} |
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if(file_exists($filename)) { |
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$log->write("Using previously generated package $filename"); |
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// This will ensure that our cache garbage collection will remove least-recently-accessed, |
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// rather than oldest. |
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touch($filename); |
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return $filename; |
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} else { |
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if($this->cacheSize) { |
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$this->reduceDirSizeTo($buildPath, $this->cacheSize - 1, $log); |
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} |
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if($generator->generatePackage($sha, $repositoryDir, $filename, $log)) { |
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return $filename; |
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} |
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} |
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} |
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/** |
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* Take the identifier an make it safe to use as a directory name. |
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* |
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* @param string $identifier The unsanitised directory name. |
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*/ |
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protected function sanitiseDirName($identifier) { |
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$safe = preg_replace('/[^A-Za-z0-9_-]/', '', $identifier); |
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return $safe ? $safe : 'null'; |
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} |
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/** |
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* Delete items in this directory until the number of items is <= $count. |
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* Delete the oldest files first. |
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* |
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* @param string $dir The directory to remove items from |
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* @param int $count The maximum number of .tar.gz files that can appear in that directory |
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* @param DeploynautLogFile $log The log to send removal status messages to |
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*/ |
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protected function reduceDirSizeTo($dir, $count, DeploynautLogFile $log) { |
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$files = glob($dir . '/*.tar.gz'); |
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if(sizeof($files) > $count) { |
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usort($files, function($a, $b) { |
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return filemtime($a) > filemtime($b); |
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}); |
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for($i = 0; $i < sizeof($files) - $count; $i++) { |
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$log->write("Removing " . $files[$i] . " from package cache"); |
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unlink($files[$i]); |
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} |
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} |
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} |
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} |
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silverstripe /
deploynaut
