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By default null for none. * @var int|null */ protected $maxlife = null; /** * The number of attempts to acquire a lock when blocking is required before throwing an exception. * @var int */ protected $blockattempts = 100; /** * An array containing the locks that have been acquired but not released so far. * @var array Array of key => lock file path */ protected $locks = array(); /** * Initialises the cache lock instance. * * @param string $name The name of the cache lock * @param array $configuration */ public function __construct($name, array $configuration = array()) { $this->name = $name; if (!array_key_exists('dir', $configuration)) { $this->cachedir = make_cache_directory(md5($name)); } else { $dir = $configuration['dir']; if (strpos($dir, '/') !== false && strpos($dir, '.') !== 0) { // This looks like an absolute path. if (file_exists($dir) && is_dir($dir) && is_writable($dir)) { $this->cachedir = $dir; } } if (empty($this->cachedir)) { $dir = preg_replace('#[^a-zA-Z0-9_]#', '_', $dir); $this->cachedir = make_cache_directory($dir); } } if (array_key_exists('maxlife', $configuration) && is_number($configuration['maxlife'])) { $maxlife = (int)$configuration['maxlife']; // Minimum lock time is 60 seconds. $this->maxlife = max($maxlife, 60); } if (array_key_exists('blockattempts', $configuration) && is_number($configuration['blockattempts'])) { $this->blockattempts = (int)$configuration['blockattempts']; } } /** * Acquire a lock. * * If the lock can be acquired: * This function will return true. * * If the lock cannot be acquired the result of this method is determined by the block param: * $block = true (default) * The function will block any further execution unti the lock can be acquired. * This involves the function attempting to acquire the lock and the sleeping for a period of time. This process * will be repeated until the lock is required or until a limit is hit (100 by default) in which case a cache * exception will be thrown. * $block = false * The function will return false immediately. * * If a max life has been specified and the lock can not be acquired then the lock file will be checked against this time. * In the case that the file exceeds that max time it will be forcefully deleted. * Because this can obviously be a dangerous thing it is not used by default. If it is used it should be set high enough that * we can be as sure as possible that the executing code has completed. * * @param string $key The key that we want to lock * @param string $ownerid A unique identifier for the owner of this lock. Not used by default. * @param bool $block True if we want the program block further execution until the lock has been acquired. * @return bool * @throws cache_exception If block is set to true and more than 100 attempts have been made to acquire a lock. */ public function lock($key, $ownerid, $block = false) { // Get the name of the lock file we want to use. $lockfile = $this->get_lock_file($key); // Attempt to create a handle to the lock file. // Mode xb is the secret to this whole function. // x = Creates the file and opens it for writing. If the file already exists fopen returns false and a warning is thrown. // b = Forces binary mode. $result = @fopen($lockfile, 'xb'); // Check if we could create the file or not. if ($result === false) { // Lock exists already. if ($this->maxlife !== null && !array_key_exists($key, $this->locks)) { $mtime = filemtime($lockfile); if ($mtime < time() - $this->maxlife) { $this->unlock($key, true); $result = $this->lock($key, false); if ($result) { return true; } } } if ($block) { // OK we are blocking. We had better sleep and then retry to lock. $iterations = 0; $maxiterations = $this->blockattempts; while (($result = $this->lock($key, false)) === false) { // Usleep causes the application to cleep to x microseconds. // Before anyone asks there are 1'000'000 microseconds to a second. usleep(rand(1000, 50000)); // Sleep between 1 and 50 milliseconds. $iterations++; if ($iterations > $maxiterations) { // BOOM! We've exceeded the maximum number of iterations we want to block for. throw new cache_exception('ex_unabletolock'); } } } return false; } else { // We have the lock. fclose($result); $this->locks[$key] = $lockfile; return true; } } /** * Releases an acquired lock. * * For more details see {@link cache_lock::unlock()} * * @param string $key * @param string $ownerid A unique identifier for the owner of this lock. Not used by default. * @param bool $forceunlock If set to true the lock will be removed if it exists regardless of whether or not we own it. * @return bool */ public function unlock($key, $ownerid, $forceunlock = false) { if (array_key_exists($key, $this->locks)) { @unlink($this->locks[$key]); unset($this->locks[$key]); return true; } else if ($forceunlock) { $lockfile = $this->get_lock_file($key); if (file_exists($lockfile)) { @unlink($lockfile); } return true; } // You cannot unlock a file you didn't lock. return false; } /** * Checks if the given key is locked. * * @param string $key * @param string $ownerid */ public function check_state($key, $ownerid) { if (array_key_exists($key, $this->locks)) { // The key is locked and we own it. return true; } $lockfile = $this->get_lock_file($key); if (file_exists($lockfile)) { // The key is locked and we don't own it. return false; } return null; } /** * Gets the name to use for a lock file. * * @param string $key * @return string */ protected function get_lock_file($key) { return $this->cachedir.'/'. $key .'.lock'; } /** * Cleans up the instance what it is no longer needed. */ public function __destruct() { foreach ($this->locks as $lockfile) { // Naught, naughty developers. @unlink($lockfile); } } } version.php000064400000002237152266601160006753 0ustar00. /** * File locking for the Cache API * * @package cachelock_file * @category cache * @copyright 2012 Sam Hemelryk * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); $plugin->version = 2025041400; // The current plugin version (Date: YYYYMMDDXX). $plugin->requires = 2025040800; // Requires this Moodle version. $plugin->component = 'cachelock_file'; // Full name of the plugin (used for diagnostics) classes/privacy/provider.php000064400000002776152266601160012242 0ustar00. /** * Privacy Subsystem implementation for cachelock_file. * * @package cachelock_file * @copyright 2018 Andrew Nicols * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace cachelock_file\privacy; defined('MOODLE_INTERNAL') || die(); /** * Privacy Subsystem for cachelock_file implementing null_provider. * * @copyright 2018 Andrew Nicols * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class provider implements \core_privacy\local\metadata\null_provider { /** * Get the language string identifier with the component's language * file to explain why this plugin stores no data. * * @return string */ public static function get_reason(): string { return 'privacy:metadata'; } }