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<?php
/**
* Laconica, the distributed open-source microblogging tool
*
* Abstract class for queue managers
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* 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.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
*/
require_once 'Stomp.php';
class StompQueueManager
{
var $server = null;
var $username = null;
var $password = null;
var $base = null;
var $con = null;
var $frames = array();
function __construct()
{
$this->server = common_config('queue', 'stomp_server');
$this->username = common_config('queue', 'stomp_username');
$this->password = common_config('queue', 'stomp_password');
$this->base = common_config('queue', 'queue_basename');
}
function _connect()
{
$this->_log(LOG_DEBUG, "Connecting to $this->server...");
if (empty($this->con)) {
$this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
$this->con = new Stomp($this->server);
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 = $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');
return false;
}
common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
. $notice->id . ' for ' . $transport);
}
function nextItem($queue, $timeout=null)
{
$result = null;
$this->_connect();
$frame = $this->con->readFrame();
if ($frame) {
$this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($frame->headers['created']));
// 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);
if ($notice) {
$this->_saveFrame($notice, $queue, $frame);
} else {
$this->log(LOG_WARNING, 'queue item for notice that does not exist');
}
}
}
function done($object, $queue)
{
$notice = $object;
$this->_connect();
$frame = $this->_getFrame($notice, $queue);
if (empty($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);
$this->_clearFrame($notice, $queue);
$this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
}
}
function fail($object, $queue)
{
$notice = $object;
// STOMP server will requeue it after a while anyways,
// so no need to notify. Just get it out of our little
// array
$this->_clearFrame($notice, $queue);
}
function _frameKey($notice, $queue)
{
return ((string)$notice->id) . '-' . $queue;
}
function _saveFrame($notice, $queue, $frame)
{
$k = $this->_frameKey($notice, $queue);
$this->_frames[$k] = $frame;
return true;
}
function _getFrame($notice, $queue)
{
$k = $this->_frameKey($notice, $queue);
return $this->_frames[$k];
}
function _clearFrame($notice, $queue)
{
$k = $this->_frameKey($notice, $queue);
unset($this->_frames[$k]);
}
function _queueName($queue)
{
return common_config('queue', 'queue_basename') . $queue;
}
function _log($level, $msg)
{
common_log($level, 'StompQueueManager: '.$msg);
}
}
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