<?php
/**
- * Laconica, the distributed open-source microblogging tool
+ * StatusNet, the distributed open-source microblogging tool
*
* Abstract class for queue managers
*
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category QueueManager
- * @package Laconica
- * @author Evan Prodromou <evan@controlyourself.ca>
- * @author Sarven Capadisli <csarven@controlyourself.ca>
- * @copyright 2009 Control Yourself, Inc.
+ * @package StatusNet
+ * @author Evan Prodromou <evan@status.net>
+ * @author Sarven Capadisli <csarven@status.net>
+ * @copyright 2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
- * @link http://laconi.ca/
+ * @link http://status.net/
*/
require_once 'Stomp.php';
-class QueueManager
+class LiberalStomp extends Stomp
+{
+ function getSocket()
+ {
+ return $this->_socket;
+ }
+}
+
+class StompQueueManager
{
var $server = null;
var $username = null;
var $password = null;
var $base = null;
var $con = null;
- var $frames = array();
function __construct()
{
function _connect()
{
if (empty($this->con)) {
- $this->con = new Stomp($this->server);
+ $this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
+ $this->con = new LiberalStomp($this->server);
- if (!$this->con->connect($this->username, $this->password)) {
+ if ($this->con->connect($this->username, $this->password)) {
+ $this->_log(LOG_INFO, "Connected.");
+ } else {
$this->_log(LOG_ERR, 'Failed to connect to queue server');
throw new ServerException('Failed to connect to queue server');
}
function enqueue($object, $queue)
{
- $notice = (Notice)$object;
+ $notice = $object;
$this->_connect();
+ // XXX: serialize and send entire notice
+
$result = $this->con->send($this->_queueName($queue),
$notice->id, // BODY of the message
array ('created' => $notice->created));
if (!$result) {
- common_log(LOG_ERR, 'Error sending to '.$transport.' queue');
+ common_log(LOG_ERR, 'Error sending to '.$queue.' queue');
return false;
}
common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
- . $notice->id . ' for ' . $transport);
+ . $notice->id . ' for ' . $queue);
}
- function nextItem($queue, $timeout=null)
+ function service($queue, $handler)
{
$result = null;
$this->_connect();
- $frame = $this->con->readFrame();
+ $this->con->setReadTimeout($handler->timeout());
- if ($frame) {
- $this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($frame->headers['created']));
+ $this->con->subscribe($this->_queueName($queue));
- // XXX: Now the queue handler receives only the ID of the
- // notice, and it has to get it from the DB
- // A massive improvement would be avoid DB query by transmitting
- // all the notice details via queue server...
- $notice = Notice::staticGet($frame->body);
+ while (true) {
- if ($notice) {
- } else {
- $this->log(LOG_WARNING, 'queue item for notice that does not exist');
+ // Wait for something on one of our sockets
+
+ $stompsock = $this->con->getSocket();
+
+ $handsocks = $handler->getSockets();
+
+ $socks = array_merge(array($stompsock), $handsocks);
+
+ $read = $socks;
+ $write = array();
+ $except = array();
+
+ $ready = stream_select($read, $write, $except, $handler->timeout(), 0);
+
+ if ($ready === false) {
+ $this->_log(LOG_ERR, "Error selecting on sockets");
+ } else if ($ready > 0) {
+ if (in_array($stompsock, $read)) {
+ $this->_handleNotice($queue, $handler);
+ }
+ $handler->idle(QUEUE_HANDLER_HIT_IDLE);
}
}
+
+ $this->con->unsubscribe($this->_queueName($queue));
}
- function done($object, $queue)
+ function _handleNotice($queue, $handler)
{
- $notice = (Notice)$object;
+ $frame = $this->con->readFrame();
- $this->_connect();
+ if (!empty($frame)) {
+ $notice = Notice::staticGet('id', $frame->body);
- $frame = $this->_getFrame($notice, $queue);
+ if (empty($notice)) {
+ $this->_log(LOG_WARNING, 'Got ID '. $frame->body .' for non-existent notice in queue '. $queue);
+ $this->con->ack($frame);
+ } else {
+ if ($handler->handle_notice($notice)) {
+ $this->_log(LOG_INFO, 'Successfully handled notice '. $notice->id .' posted at ' . $frame->headers['created'] . ' in queue '. $queue);
+ $this->con->ack($frame);
+ } else {
+ $this->_log(LOG_WARNING, 'Failed handling notice '. $notice->id .' posted at ' . $frame->headers['created'] . ' in queue '. $queue);
+ // FIXME we probably shouldn't have to do
+ // this kind of queue management ourselves
+ $this->con->ack($frame);
+ $this->enqueue($notice, $queue);
+ }
+ unset($notice);
+ }
- if (empty($frame)) {
- $this->log(LOG_ERR, 'Cannot find frame for notice '.$notice->id.' in queue '.$queue);
- } else {
- // if the msg has been handled positively, ack it
- // and the queue server will remove it from the queue
- $this->con->ack($frame);
- $this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
+ unset($frame);
}
}
+
+ function _queueName($queue)
+ {
+ return common_config('queue', 'queue_basename') . $queue;
+ }
+
+ function _log($level, $msg)
+ {
+ common_log($level, 'StompQueueManager: '.$msg);
+ }
}