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<?php |
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declare(ticks = 1); |
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/** |
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* ResqueScheduler worker to handle scheduling of delayed tasks. |
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* |
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* @package ResqueScheduler |
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* @author Chris Boulton <[email protected]> |
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* @copyright (c) 2012 Chris Boulton |
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* @license http://www.opensource.org/licenses/mit-license.php |
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*/ |
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class ResqueScheduler_Worker |
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{ |
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const LOG_NONE = 0; |
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const LOG_NORMAL = 1; |
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const LOG_VERBOSE = 2; |
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/** |
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* @var int Current log level of this worker. |
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*/ |
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public $logLevel = 0; |
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/** |
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* @var int Interval to sleep for between checking schedules. |
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*/ |
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protected $interval = 5; |
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/** |
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* @var boolean True if on the next iteration, the worker should shutdown. |
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*/ |
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private $shutdown = false; |
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/** |
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* The primary loop for a worker. |
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* |
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* Every $interval (seconds), the scheduled queue will be checked for jobs |
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* that should be pushed to Resque. |
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* |
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* @param int $interval How often to check schedules. |
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*/ |
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public function work($interval = null) |
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{ |
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if ($interval !== null) { |
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$this->interval = $interval; |
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} |
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$this->updateProcLine('Starting'); |
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$this->registerSigHandlers(); |
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while (true) { |
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if($this->shutdown) { |
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break; |
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} |
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$this->handleDelayedItems(); |
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$this->sleep(); |
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} |
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} |
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/** |
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* Handle delayed items for the next scheduled timestamp. |
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* |
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* Searches for any items that are due to be scheduled in Resque |
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* and adds them to the appropriate job queue in Resque. |
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* |
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* @param DateTime|int $timestamp Search for any items up to this timestamp to schedule. |
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*/ |
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public function handleDelayedItems($timestamp = null) |
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{ |
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while (($oldestJobTimestamp = ResqueScheduler::nextDelayedTimestamp($timestamp)) !== false) { |
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$this->updateProcLine('Processing Delayed Items'); |
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$this->enqueueDelayedItemsForTimestamp($oldestJobTimestamp); |
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} |
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} |
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/** |
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* Schedule all of the delayed jobs for a given timestamp. |
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* |
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* Searches for all items for a given timestamp, pulls them off the list of |
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* delayed jobs and pushes them across to Resque. |
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* |
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* @param DateTime|int $timestamp Search for any items up to this timestamp to schedule. |
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*/ |
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public function enqueueDelayedItemsForTimestamp($timestamp) |
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{ |
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$item = null; |
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while ($item = ResqueScheduler::nextItemForTimestamp($timestamp)) { |
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$this->log('queueing ' . $item['class'] . ' in ' . $item['queue'] .' [delayed]'); |
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Resque_Event::trigger('beforeDelayedEnqueue', array( |
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'queue' => $item['queue'], |
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'class' => $item['class'], |
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'args' => $item['args'], |
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)); |
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$payload = array_merge(array($item['queue'], $item['class']), $item['args']); |
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call_user_func_array('Resque::enqueue', $payload); |
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} |
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} |
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/** |
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* Sleep for the defined interval. |
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*/ |
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protected function sleep() |
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{ |
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sleep($this->interval); |
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} |
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/** |
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* Update the status of the current worker process. |
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* |
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* On supported systems (with the PECL proctitle module installed), update |
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* the name of the currently running process to indicate the current state |
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* of a worker. |
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* |
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* @param string $status The updated process title. |
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*/ |
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private function updateProcLine($status) |
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{ |
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if(function_exists('setproctitle')) { |
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setproctitle('resque-scheduler-' . ResqueScheduler::VERSION . ': ' . $status); |
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} |
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} |
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/** |
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* Output a given log message to STDOUT. |
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* |
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* @param string $message Message to output. |
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*/ |
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public function log($message) |
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{ |
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if($this->logLevel == self::LOG_NORMAL) { |
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fwrite(STDOUT, "*** " . $message . "\n"); |
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} |
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else if($this->logLevel == self::LOG_VERBOSE) { |
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fwrite(STDOUT, "** [" . strftime('%T %Y-%m-%d') . "] " . $message . "\n"); |
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} |
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} |
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/** |
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* Register signal handlers that a worker should respond to. |
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* |
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* TERM: Shutdown after the current timestamp was processed. |
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* INT: Shutdown after the current timestamp was processed. |
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* QUIT: Shutdown after the current timestamp was processed. |
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*/ |
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private function registerSigHandlers() |
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{ |
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if(!function_exists('pcntl_signal')) { |
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return; |
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} |
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pcntl_signal(SIGTERM, array($this, 'shutdown')); |
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pcntl_signal(SIGINT, array($this, 'shutdown')); |
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pcntl_signal(SIGQUIT, array($this, 'shutdown')); |
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} |
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public function shutdown() |
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{ |
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$this->shutdown = true; |
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} |
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} |
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resque /
php-resque
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