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- 28.08.2024
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LockHandler.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\Filesystem;
013
014 use Symfony\Component\Filesystem\Exception\IOException;
015 use Symfony\Component\Lock\Store\FlockStore;
016 use Symfony\Component\Lock\Store\SemaphoreStore;
017
018 @trigger_error(sprintf('The %s class is deprecated since Symfony 3.4 and will be removed in 4.0. Use %s or %s instead.', LockHandler::class, SemaphoreStore::class, FlockStore::class), \E_USER_DEPRECATED);
019
020 /**
021 * LockHandler class provides a simple abstraction to lock anything by means of
022 * a file lock.
023 *
024 * A locked file is created based on the lock name when calling lock(). Other
025 * lock handlers will not be able to lock the same name until it is released
026 * (explicitly by calling release() or implicitly when the instance holding the
027 * lock is destroyed).
028 *
029 * @author Grégoire Pineau <lyrixx@lyrixx.info>
030 * @author Romain Neutron <imprec@gmail.com>
031 * @author Nicolas Grekas <p@tchwork.com>
032 *
033 * @deprecated since version 3.4, to be removed in 4.0. Use Symfony\Component\Lock\Store\SemaphoreStore or Symfony\Component\Lock\Store\FlockStore instead.
034 */
035 class LockHandler
036 {
037 private $file;
038 private $handle;
039
040 /**
041 * @param string $name The lock name
042 * @param string|null $lockPath The directory to store the lock. Default values will use temporary directory
043 *
044 * @throws IOException If the lock directory could not be created or is not writable
045 */
046 public function __construct($name, $lockPath = null)
047 {
048 $lockPath = $lockPath ?: sys_get_temp_dir();
049
050 if (!is_dir($lockPath)) {
051 $fs = new Filesystem();
052 $fs->mkdir($lockPath);
053 }
054
055 if (!is_writable($lockPath)) {
056 throw new IOException(sprintf('The directory "%s" is not writable.', $lockPath), 0, null, $lockPath);
057 }
058
059 $this->file = sprintf('%s/sf.%s.%s.lock', $lockPath, preg_replace('/[^a-z0-9\._-]+/i', '-', $name), hash('sha256', $name));
060 }
061
062 /**
063 * Lock the resource.
064 *
065 * @param bool $blocking Wait until the lock is released
066 *
067 * @return bool Returns true if the lock was acquired, false otherwise
068 *
069 * @throws IOException If the lock file could not be created or opened
070 */
071 public function lock($blocking = false)
072 {
073 if ($this->handle) {
074 return true;
075 }
076
077 $error = null;
078
079 // Silence error reporting
080 set_error_handler(function ($errno, $msg) use (&$error) {
081 $error = $msg;
082 });
083
084 if (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
085 if ($this->handle = fopen($this->file, 'x')) {
086 chmod($this->file, 0666);
087 } elseif (!$this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r')) {
088 usleep(100); // Give some time for chmod() to complete
089 $this->handle = fopen($this->file, 'r+') ?: fopen($this->file, 'r');
090 }
091 }
092 restore_error_handler();
093
094 if (!$this->handle) {
095 throw new IOException($error, 0, null, $this->file);
096 }
097
098 // On Windows, even if PHP doc says the contrary, LOCK_NB works, see
099 // https://bugs.php.net/54129
100 if (!flock($this->handle, \LOCK_EX | ($blocking ? 0 : \LOCK_NB))) {
101 fclose($this->handle);
102 $this->handle = null;
103
104 return false;
105 }
106
107 return true;
108 }
109
110 /**
111 * Release the resource.
112 */
113 public function release()
114 {
115 if ($this->handle) {
116 flock($this->handle, \LOCK_UN | \LOCK_NB);
117 fclose($this->handle);
118 $this->handle = null;
119 }
120 }
121 }
122