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132 lines
3.4 KiB
PHP
132 lines
3.4 KiB
PHP
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<?php
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namespace Psalm\Provider;
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use Psalm\Config;
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use Psalm\Storage\FileStorage;
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class FileStorageCacheProvider
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{
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/**
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* @var string
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*/
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private $modified_timestamps = '';
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/**
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* @var Config
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*/
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private $config;
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const FILE_CACHE_DIRECTORY = 'file_cache';
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public function __construct(Config $config)
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{
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$this->config = $config;
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$storage_dir = dirname(__DIR__) . DIRECTORY_SEPARATOR . 'Storage' . DIRECTORY_SEPARATOR;
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$dependent_files = [
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$storage_dir . 'FileStorage.php',
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$storage_dir . 'FunctionLikeStorage.php',
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];
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foreach ($dependent_files as $dependent_file_path) {
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if (!file_exists($dependent_file_path)) {
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throw new \UnexpectedValueException($dependent_file_path . ' must exist');
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}
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$this->modified_timestamps .= ' ' . filemtime($dependent_file_path);
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}
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}
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/**
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* @param string $file_path
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* @param string $file_contents
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*
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* @return void
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*/
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public function writeToCache(FileStorage $storage, $file_contents)
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{
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$file_path = strtolower($storage->file_path);
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$cache_location = $this->getCacheLocationForPath($file_path, true);
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$storage->hash = $this->getCacheHash($file_path, $file_contents);
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file_put_contents($cache_location, serialize($storage));
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}
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/**
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* @param string $file_path
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* @param string $file_contents
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*
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* @return FileStorage|null
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*/
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public function getLatestFromCache($file_path, $file_contents)
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{
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$cached_value = $this->loadFromCache($file_path);
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if (!$cached_value) {
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return null;
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}
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$cache_hash = $this->getCacheHash($file_path, $file_contents);
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if ($cache_hash !== $cached_value->hash) {
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unlink($this->getCacheLocationForPath($file_path));
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return null;
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}
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return $cached_value;
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}
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/**
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* @param string|null $file_path
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* @param string|null $file_contents
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*
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* @return string
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*/
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private function getCacheHash($file_path, $file_contents)
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{
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return sha1($file_path . ' ' . $file_contents . $this->modified_timestamps);
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}
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/**
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* @param string $file_path
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*
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* @return FileStorage|null
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*/
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private function loadFromCache($file_path)
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{
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$cache_location = $this->getCacheLocationForPath($file_path);
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if (file_exists($cache_location)) {
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/** @var FileStorage */
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return unserialize((string)file_get_contents($cache_location)) ?: null;
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}
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return null;
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}
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/**
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* @param string $file_path
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* @param bool $create_directory
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*
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* @return string
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*/
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private function getCacheLocationForPath($file_path, $create_directory = false)
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{
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$root_cache_directory = $this->config->getCacheDirectory();
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if (!$root_cache_directory) {
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throw new \UnexpectedValueException('No cache directory defined');
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}
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$parser_cache_directory = $root_cache_directory . DIRECTORY_SEPARATOR . self::FILE_CACHE_DIRECTORY;
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if ($create_directory && !is_dir($parser_cache_directory)) {
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mkdir($parser_cache_directory, 0777, true);
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}
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return $parser_cache_directory . DIRECTORY_SEPARATOR . sha1($file_path);
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}
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}
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