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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, Control Yourself, Inc.
*
* 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/>.
*/
define('CLAIM_TIMEOUT', 1200);
if (!defined('LACONICA')) { exit(1); }
require_once(INSTALLDIR.'/lib/daemon.php');
require_once(INSTALLDIR.'/classes/Queue_item.php');
require_once(INSTALLDIR.'/classes/Notice.php');
class QueueHandler extends Daemon
{
var $_id = 'generic';
function QueueHandler($id=null)
{
if ($id) {
$this->set_id($id);
}
}
function class_name()
{
return ucfirst($this->transport()) . 'Handler';
}
function name()
{
return strtolower($this->class_name().'.'.$this->get_id());
}
function get_id()
{
return $this->_id;
}
function set_id($id)
{
$this->_id = $id;
}
function transport()
{
return null;
}
function start()
{
}
function finish()
{
}
function handle_notice($notice)
{
return true;
}
function db_dispatch() {
do {
$qi = Queue_item::top($this->transport());
if ($qi) {
$this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($qi->created));
$notice = Notice::staticGet($qi->notice_id);
if ($notice) {
$this->log(LOG_INFO, 'broadcasting notice ID = ' . $notice->id);
# XXX: what to do if broadcast fails?
$result = $this->handle_notice($notice);
if (!$result) {
$this->log(LOG_WARNING, 'Failed broadcast for notice ID = ' . $notice->id);
$orig = $qi;
$qi->claimed = null;
$qi->update($orig);
$this->log(LOG_WARNING, 'Abandoned claim for notice ID = ' . $notice->id);
continue;
}
$this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
$notice->free();
unset($notice);
$notice = null;
} else {
$this->log(LOG_WARNING, 'queue item for notice that does not exist');
}
$qi->delete();
$qi->free();
unset($qi);
$this->idle(0);
} else {
$this->clear_old_claims();
$this->idle(5);
}
} while (true);
}
function stomp_dispatch() {
require("Stomp.php");
$con = new Stomp(common_config('queue','stomp_server'));
if (!$con->connect()) {
$this->log(LOG_ERR, 'Failed to connect to queue server');
return false;
}
$queue_basename = common_config('queue','queue_basename');
// subscribe to the relevant queue (format: basename-transport)
$con->subscribe('/queue/'.$queue_basename.'-'.$this->transport());
do {
$frame = $con->readFrame();
if ($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->log(LOG_INFO, 'broadcasting notice ID = ' . $notice->id);
$result = $this->handle_notice($notice);
if ($result) {
// if the msg has been handled positively, ack it
// and the queue server will remove it from the queue
$con->ack($frame);
$this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
}
else {
// no ack
$this->log(LOG_WARNING, 'Failed broadcast for notice ID = ' . $notice->id);
}
$notice->free();
unset($notice);
$notice = null;
} else {
$this->log(LOG_WARNING, 'queue item for notice that does not exist');
}
}
} while (true);
$con->disconnect();
}
function run()
{
if (!$this->start()) {
return false;
}
$this->log(LOG_INFO, 'checking for queued notices');
if (common_config('queue','subsystem') == 'stomp') {
$this->stomp_dispatch();
}
else {
$this->db_dispatch();
}
if (!$this->finish()) {
return false;
}
return true;
}
function idle($timeout=0)
{
if ($timeout>0) {
sleep($timeout);
}
}
function clear_old_claims()
{
$qi = new Queue_item();
$qi->transport = $this->transport();
$qi->whereAdd('now() - claimed > '.CLAIM_TIMEOUT);
$qi->update(DB_DATAOBJECT_WHEREADD_ONLY);
$qi->free();
unset($qi);
}
function log($level, $msg)
{
common_log($level, $this->class_name() . ' ('. $this->get_id() .'): '.$msg);
}
}
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