Resque\Socket\Server::run PHP Method

    public function run()
    {
        if (!$this->started) {
            $this->start();
        }
        if (function_exists('pcntl_signal')) {
            declare (ticks=1);
            pcntl_signal(SIGTERM, array($this, 'shutdown'));
            pcntl_signal(SIGINT, array($this, 'shutdown'));
            pcntl_signal(SIGQUIT, array($this, 'shutdown'));
        }
        register_shutdown_function(array($this, 'close'));
        while (true) {
            if ($this->shutdown) {
                $this->log('Shutting down listener on <pop>' . $this . '</pop>', Logger::INFO);
                break;
            }
            $read = array($this->socket);
            foreach ($this->clients as &$client) {
                $read[] = $client->getSocket();
            }
            // Set up a blocking call to socket_select
            $write = $except = null;
            if (($changed_sockets = @socket_select($read, $write, $except, $this->tv_sec)) < 1) {
                // $this->log('Waiting for socket update', self::LOG_VERBOSE);
                continue;
            }
            // Handle new Connections
            if (in_array($this->socket, $read)) {
                if (count($this->clients) >= $this->max_clients) {
                    $this->log('New client trying to connect but maximum <pop>' . $this->max_clients . '</pop> clients already connected', Logger::INFO);
                    $client = new Client($this->socket);
                    $this->send($client, '{"ok":0,"message":"Could not connect, hit max number of connections"}');
                    $client->disconnect();
                    continue;
                } else {
                    $this->clients[] = $client = new Client($this->socket);
                    $this->log('New client connected: <pop>' . $client . '</pop>', Logger::INFO);
                    $this->fire(self::CLIENT_CONNECT, $client);
                }
            }
            // Handle input for each client
            foreach ($this->clients as $i => $client) {
                if (in_array($client->getSocket(), $read)) {
                    $data = @socket_read($client->getSocket(), $this->max_read);
                    if ($data === false) {
                        $this->disconnect($client);
                        continue;
                    }
                    // Remove any control characters
                    $data = preg_replace('/[\\x00-\\x1F\\x7F]/', '', trim($data));
                    if (empty($data)) {
                        // Send a null byte to flush
                        $this->send($client, "");
                    } else {
                        $this->log(sprintf('Received "<comment>%s</comment>" from <pop>%s</pop>', $data, $client), Logger::INFO);
                        $this->fire(self::CLIENT_RECEIVE, $client, $data);
                    }
                }
            }
        }
    }

 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $host = $this->getConfig('listenhost');
     $port = $this->getConfig('listenport');
     $retry = $this->getConfig('listenretry');
     $timeout = $this->getConfig('listentimeout');
     $server = new Socket\Server(array('ip' => $host, 'port' => $port), $this->logger);
     do {
         try {
             $server->start();
         } catch (Socket\Exception $e) {
             if ($retry) {
                 $server->log('<error>Socket server failure: "' . $e->getMessage() . '". Retrying in ' . $timeout . ' seconds...</error>');
                 sleep($timeout);
                 continue;
             }
             throw $e;
         }
         break;
     } while ($retry);
     $command = $this;
     $server->onConnect(function ($server, &$client, $input) {
         //
     });
     $server->onDisconnect(function ($server, &$client, $message) {
         $server->send($client, $message);
     });
     $server->onReceive(function ($server, &$client, $input) use($command) {
         if (!($data = json_decode(trim($input), true))) {
             $data = trim($input);
         }
         if (is_array($data)) {
             $cmd = $data['cmd'];
             unset($data['cmd']);
         } else {
             try {
                 $input = new StringInput($data, new InputDefinition(array(new InputArgument('cmd', InputArgument::REQUIRED), new InputArgument('id', InputArgument::OPTIONAL), new InputOption('force', 'f', InputOption::VALUE_NONE), new InputOption('json', 'j', InputOption::VALUE_NONE))));
                 $cmd = $input->getArgument('cmd');
                 $data = array('id' => $input->getArgument('id'), 'force' => $input->getOption('force'), 'json' => $input->getOption('json'));
             } catch (\Exception $e) {
                 $server->send($client, 'Command error: ' . $e->getMessage());
                 return;
             }
         }
         switch (strtolower($cmd)) {
             case 'shell':
                 $server->send($client, 'Connected to php-resque on ' . $server . '. To quit, type "quit"');
                 break;
             case 'workers':
                 $workers = Worker::hostWorkers();
                 if (empty($workers)) {
                     $response = array('ok' => 0, 'message' => 'There are no workers running on this host.');
                     $server->send($client, $data['json'] ? json_encode($response) : $response['message']);
                     return;
                 }
                 if ($data['json']) {
                     $response = array('ok' => 1, 'data' => array());
                     foreach ($workers as $i => $worker) {
                         $response['data'][] = $worker->getPacket();
                     }
                     $server->send($client, json_encode($response));
                 } else {
                     $table = new Resque\Helpers\Table($command);
                     $table->setHeaders(array('#', 'Status', 'ID', 'Running for', 'Running job', 'P', 'C', 'F', 'Interval', 'Timeout', 'Memory (Limit)'));
                     foreach ($workers as $i => $worker) {
                         $packet = $worker->getPacket();
                         $table->addRow(array($i + 1, Worker::$statusText[$packet['status']], (string) $worker, Util::human_time_diff($packet['started']), !empty($packet['job_id']) ? $packet['job_id'] . ' for ' . Util::human_time_diff($packet['job_started']) : '-', $packet['processed'], $packet['cancelled'], $packet['failed'], $packet['interval'], $packet['timeout'], Util::bytes($packet['memory']) . ' (' . $packet['memory_limit'] . ' MB)'));
                     }
                     $server->send($client, (string) $table);
                 }
                 break;
             case 'worker:start':
             case 'worker:restart':
                 $response = array('ok' => 0, 'message' => 'This command is not yet supported remotely.');
                 $server->send($client, $data['json'] ? json_encode($response) : $response['message']);
                 break;
             case 'worker:pause':
             case 'worker:resume':
             case 'worker:stop':
             case 'worker:cancel':
                 $valid_id = false;
                 $id = preg_replace('/[^a-z0-9\\*:,\\.;-]/i', '', $data['id']);
                 if (!empty($id)) {
                     if (false === ($worker = Resque\Worker::hostWorker($id))) {
                         if ($data['json']) {
                             $response = array('ok' => 0, 'message' => 'Invalid worker id.');
                             $server->send($client, json_encode($response));
                         } else {
                             $server->send($client, "Usage:\n\t{$cmd} <worker_id>\n\n" . "Help: You must specify a valid worker id, to get a \n" . "list of workers use the \"workers\" command.");
                         }
                         return;
                     }
                     $workers = array($worker);
                 } else {
                     $workers = Resque\Worker::hostWorkers();
                     if (empty($workers)) {
                         $response = array('ok' => 0, 'message' => 'There are no workers on this host.');
                         $server->send($client, $data['json'] ? json_encode($response) : $response['message']);
                         return;
                     }
                 }
                 $cmd = $data['force'] ? 'worker:term' : $cmd;
                 $signals = array('worker:pause' => SIGUSR2, 'worker:resume' => SIGCONT, 'worker:stop' => SIGQUIT, 'worker:term' => SIGTERM, 'worker:cancel' => SIGUSR1);
                 $messages = array('worker:pause' => 'Paused worker %s', 'worker:resume' => 'Resumed worker %s', 'worker:stop' => 'Stopped worker %s', 'worker:term' => 'Force stopped worker %s', 'worker:cancel' => 'Cancelled running job on worker %s');
                 $response = array('ok' => 1, 'data' => array());
                 foreach ($workers as $worker) {
                     $pid = $worker->getPid();
                     if ($cmd == 'worker:cancel') {
                         $packet = $worker->getPacket();
                         $job_pid = (int) $packet['job_pid'];
                         if ($job_pid and posix_kill($job_pid, 0)) {
                             $pid = $job_pid;
                         } else {
                             $response['data'][] = array('ok' => 0, 'message' => 'The worker ' . $worker . ' has no running job to cancel.');
                             continue;
                         }
                     }
                     if (posix_kill($pid, $signals[$cmd])) {
                         $response['data'][] = array('ok' => 1, 'message' => sprintf($messages[$cmd], $worker));
                     } else {
                         $response['data'][] = array('ok' => 0, 'message' => 'There was an error sending the signal, please try again.');
                     }
                 }
                 $server->send($client, $data['json'] ? json_encode($response) : implode(PHP_EOL, array_map(function ($d) {
                     return $d['message'];
                 }, $response['data'])));
                 break;
             case 'job:queue':
                 $response = array('ok' => 0, 'message' => 'Cannot queue remotely as it makes no sense. Use command `resque job:queue <job> <args> [--queue=<queue> [--delay=<delay>]]` locally.');
                 $server->send($client, $data['json'] ? json_encode($response) : $response['message']);
                 break;
             case 'cleanup':
                 $host = new Host();
                 $cleaned_hosts = $host->cleanup();
                 $worker = new Worker('*');
                 $cleaned_workers = $worker->cleanup();
                 $cleaned_hosts = array_merge_recursive($cleaned_hosts, $host->cleanup());
                 $cleaned_jobs = Job::cleanup();
                 if ($data['json']) {
                     $response = array('ok' => 1, 'data' => array_merge($cleaned_hosts, $cleaned_workers, $cleaned_jobs));
                     $server->send($client, json_encode($response));
                 } else {
                     $output = 'Cleaned hosts: ' . json_encode($cleaned_hosts['hosts']) . PHP_EOL . 'Cleaned workers: ' . json_encode(array_merge($cleaned_hosts['workers'], $cleaned_workers)) . PHP_EOL . 'Cleaned ' . $cleaned_jobs['zombie'] . ' zombie job' . ($cleaned_jobs['zombie'] == 1 ? '' : 's') . PHP_EOL . 'Cleared ' . $cleaned_jobs['processed'] . ' processed job' . ($cleaned_jobs['processed'] == 1 ? '' : 's');
                 }
                 $server->send($client, $output);
                 break;
             case 'shutdown':
                 $server->shutdown();
                 break;
             case 'quit':
             case 'exit':
                 $server->disconnect($client);
                 break;
             default:
                 $response = array('ok' => 0, 'message' => 'Sorry, I don\'t know what to do with command "' . $cmd . '".');
                 $server->send($client, $data['json'] ? json_encode($response) : $response['message']);
                 break;
         }
     });
     $server->run();
 }