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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 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;
function __construct()
{
$this->server = common_config('queue', 'stomp_server');
$this->username = common_config('queue', 'stomp_username');
$this->password = common_config('queue', 'stomp_password');
$this->base = common_config('queue', 'queue_basename');
}
function _connect()
{
if (empty($this->con)) {
$this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
$this->con = new LiberalStomp($this->server);
if ($this->con->connect($this->username, $this->password)) {
$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 '.$queue.' queue');
return false;
}
common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
. $notice->id . ' for ' . $queue);
}
function service($queue, $handler)
{
$result = null;
$this->_connect();
$this->con->setReadTimeout($handler->timeout());
$this->con->subscribe($this->_queueName($queue));
while (true) {
// 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);
} else { // timeout
$handler->idle(QUEUE_HANDLER_MISS_IDLE);
}
}
$this->con->unsubscribe($this->_queueName($queue));
}
function _handleNotice($queue, $handler)
{
$frame = $this->con->readFrame();
if (!empty($frame)) {
$notice = Notice::staticGet('id', $frame->body);
if (empty($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);
}
unset($frame);
}
}
function _queueName($queue)
{
return common_config('queue', 'queue_basename') . $queue;
}
function _log($level, $msg)
{
common_log($level, 'StompQueueManager: '.$msg);
}
}
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