/**
* Look for any workers which should be running on this server and if
* they're not, remove them from Redis.
*
* This is a form of garbage collection to handle cases where the
* server may have been killed and the workers did not die gracefully
* and therefore leave state information in Redis.
*/
public function cleanup()
{
$workers = self::allWorkers();
$hosts = $this->redis->smembers(Host::redisKey());
$cleaned = array();
foreach ($workers as $worker) {
list($host, $pid) = explode(':', (string) $worker, 2);
if ($host != (string) $this->host and in_array($host, $hosts) or $host == (string) $this->host and posix_kill((int) $pid, 0)) {
continue;
}
$this->log('Pruning dead worker: ' . $worker, Logger::DEBUG);
$worker->unregister();
$cleaned[] = (string) $worker;
}
$workerIds = array_map(function ($w) {
return (string) $w;
}, $workers);
$keys = (array) $this->redis->keys('worker:' . $this->host . ':*');
foreach ($keys as $key) {
$key = $this->redis->removeNamespace($key);
$id = substr($key, strlen('worker:'));
if (!in_array($id, $workerIds)) {
if ($this->redis->ttl($key) < 0) {
$this->log('Expiring worker data: ' . $key, Logger::DEBUG);
$this->redis->expire($key, \Resque::getConfig('default.expiry_time', \Resque::DEFAULT_EXPIRY_TIME));
}
}
}
Event::fire(Event::WORKER_CLEANUP, array($this, $cleaned));
return $cleaned;
}