258 lines
7.6 KiB
PHP
258 lines
7.6 KiB
PHP
<?php
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/*
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* This file is part of Composer.
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*
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* (c) Nils Adermann <naderman@naderman.de>
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* Jordi Boggiano <j.boggiano@seld.be>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Composer;
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use Composer\IO\IOInterface;
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use Composer\Util\Filesystem;
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use Composer\Util\Silencer;
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use Symfony\Component\Finder\Finder;
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/**
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* Reads/writes to a filesystem cache
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*
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* @author Jordi Boggiano <j.boggiano@seld.be>
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*/
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class Cache
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{
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private static $cacheCollected = false;
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private $io;
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private $root;
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private $enabled = true;
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private $allowlist;
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private $filesystem;
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/**
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* @param IOInterface $io
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* @param string $cacheDir location of the cache
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* @param string $allowlist List of characters that are allowed in path names (used in a regex character class)
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* @param Filesystem $filesystem optional filesystem instance
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*/
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public function __construct(IOInterface $io, $cacheDir, $allowlist = 'a-z0-9.', Filesystem $filesystem = null)
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{
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$this->io = $io;
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$this->root = rtrim($cacheDir, '/\\') . '/';
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$this->allowlist = $allowlist;
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$this->filesystem = $filesystem ?: new Filesystem();
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if (!self::isUsable($cacheDir)) {
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$this->enabled = false;
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return;
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}
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if (
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(!is_dir($this->root) && !Silencer::call('mkdir', $this->root, 0777, true))
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|| !is_writable($this->root)
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) {
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$this->io->writeError('<warning>Cannot create cache directory ' . $this->root . ', or directory is not writable. Proceeding without cache</warning>');
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$this->enabled = false;
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}
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}
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public static function isUsable($path)
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{
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return !preg_match('{(^|[\\\\/])(\$null|nul|NUL|/dev/null)([\\\\/]|$)}', $path);
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}
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public function isEnabled()
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{
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return $this->enabled;
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}
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public function getRoot()
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{
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return $this->root;
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}
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public function read($file)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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if (file_exists($this->root . $file)) {
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$this->io->writeError('Reading '.$this->root . $file.' from cache', true, IOInterface::DEBUG);
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return file_get_contents($this->root . $file);
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}
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}
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return false;
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}
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public function write($file, $contents)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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$this->io->writeError('Writing '.$this->root . $file.' into cache', true, IOInterface::DEBUG);
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try {
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return file_put_contents($this->root . $file, $contents);
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} catch (\ErrorException $e) {
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$this->io->writeError('<warning>Failed to write into cache: '.$e->getMessage().'</warning>', true, IOInterface::DEBUG);
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if (preg_match('{^file_put_contents\(\): Only ([0-9]+) of ([0-9]+) bytes written}', $e->getMessage(), $m)) {
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// Remove partial file.
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unlink($this->root . $file);
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$message = sprintf(
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'<warning>Writing %1$s into cache failed after %2$u of %3$u bytes written, only %4$u bytes of free space available</warning>',
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$this->root . $file,
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$m[1],
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$m[2],
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@disk_free_space($this->root . dirname($file))
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);
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$this->io->writeError($message);
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return false;
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}
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throw $e;
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}
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}
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return false;
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}
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/**
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* Copy a file into the cache
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*/
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public function copyFrom($file, $source)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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$this->filesystem->ensureDirectoryExists(dirname($this->root . $file));
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if (!file_exists($source)) {
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$this->io->writeError('<error>'.$source.' does not exist, can not write into cache</error>');
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} elseif ($this->io->isDebug()) {
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$this->io->writeError('Writing '.$this->root . $file.' into cache from '.$source);
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}
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return copy($source, $this->root . $file);
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}
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return false;
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}
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/**
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* Copy a file out of the cache
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*/
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public function copyTo($file, $target)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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if (file_exists($this->root . $file)) {
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try {
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touch($this->root . $file, filemtime($this->root . $file), time());
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} catch (\ErrorException $e) {
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// fallback in case the above failed due to incorrect ownership
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// see https://github.com/composer/composer/issues/4070
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Silencer::call('touch', $this->root . $file);
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}
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$this->io->writeError('Reading '.$this->root . $file.' from cache', true, IOInterface::DEBUG);
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return copy($this->root . $file, $target);
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}
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}
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return false;
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}
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public function gcIsNecessary()
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{
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return (!self::$cacheCollected && !mt_rand(0, 50));
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}
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public function remove($file)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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if (file_exists($this->root . $file)) {
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return $this->filesystem->unlink($this->root . $file);
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}
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}
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return false;
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}
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public function clear()
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{
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if ($this->enabled) {
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$this->filesystem->emptyDirectory($this->root);
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return true;
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}
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return false;
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}
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public function gc($ttl, $maxSize)
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{
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if ($this->enabled) {
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$expire = new \DateTime();
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$expire->modify('-'.$ttl.' seconds');
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$finder = $this->getFinder()->date('until '.$expire->format('Y-m-d H:i:s'));
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foreach ($finder as $file) {
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$this->filesystem->unlink($file->getPathname());
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}
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$totalSize = $this->filesystem->size($this->root);
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if ($totalSize > $maxSize) {
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$iterator = $this->getFinder()->sortByAccessedTime()->getIterator();
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while ($totalSize > $maxSize && $iterator->valid()) {
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$filepath = $iterator->current()->getPathname();
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$totalSize -= $this->filesystem->size($filepath);
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$this->filesystem->unlink($filepath);
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$iterator->next();
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}
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}
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self::$cacheCollected = true;
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return true;
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}
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return false;
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}
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public function sha1($file)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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if (file_exists($this->root . $file)) {
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return sha1_file($this->root . $file);
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}
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}
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return false;
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}
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public function sha256($file)
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{
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if ($this->enabled) {
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$file = preg_replace('{[^'.$this->allowlist.']}i', '-', $file);
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if (file_exists($this->root . $file)) {
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return hash_file('sha256', $this->root . $file);
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}
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}
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return false;
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}
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protected function getFinder()
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{
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return Finder::create()->in($this->root)->files();
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}
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}
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