3 * Laconica - a distributed open-source microblogging tool
4 * Copyright (C) 2008, 2009, Control Yourself, Inc.
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Affero General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Affero General Public License for more details.
16 * You should have received a copy of the GNU Affero General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 define('CLAIM_TIMEOUT', 1200);
22 if (!defined('LACONICA')) { exit(1); }
24 require_once(INSTALLDIR.'/lib/daemon.php');
25 require_once(INSTALLDIR.'/classes/Queue_item.php');
26 require_once(INSTALLDIR.'/classes/Notice.php');
28 class QueueHandler extends Daemon
32 function __construct($id=null, $daemonize=true)
34 parent::__construct($daemonize);
43 return ucfirst($this->transport()) . 'Handler';
48 return strtolower($this->class_name().'.'.$this->get_id());
74 function handle_notice($notice)
79 function db_dispatch() {
81 $qi = Queue_item::top($this->transport());
83 $this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($qi->created));
84 $notice = Notice::staticGet($qi->notice_id);
86 $this->log(LOG_INFO, 'broadcasting notice ID = ' . $notice->id);
87 # XXX: what to do if broadcast fails?
88 $result = $this->handle_notice($notice);
90 $this->log(LOG_WARNING, 'Failed broadcast for notice ID = ' . $notice->id);
94 $this->log(LOG_WARNING, 'Abandoned claim for notice ID = ' . $notice->id);
97 $this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
102 $this->log(LOG_WARNING, 'queue item for notice that does not exist');
109 $this->clear_old_claims();
115 function stomp_dispatch() {
117 // use an external message queue system via STOMP
118 require_once("Stomp.php");
120 $server = common_config('queue','stomp_server');
121 $username = common_config('queue', 'stomp_username');
122 $password = common_config('queue', 'stomp_password');
124 $con = new Stomp($server);
126 if (!$con->connect($username, $password)) {
127 $this->log(LOG_ERR, 'Failed to connect to queue server');
131 $queue_basename = common_config('queue','queue_basename');
132 // subscribe to the relevant queue (format: basename-transport)
133 $con->subscribe('/queue/'.$queue_basename.'-'.$this->transport());
136 $frame = $con->readFrame();
138 $this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($frame->headers['created']));
140 // XXX: Now the queue handler receives only the ID of the
141 // notice, and it has to get it from the DB
142 // A massive improvement would be avoid DB query by transmitting
143 // all the notice details via queue server...
144 $notice = Notice::staticGet($frame->body);
147 $this->log(LOG_INFO, 'broadcasting notice ID = ' . $notice->id);
148 $result = $this->handle_notice($notice);
150 // if the msg has been handled positively, ack it
151 // and the queue server will remove it from the queue
153 $this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
157 $this->log(LOG_WARNING, 'Failed broadcast for notice ID = ' . $notice->id);
163 $this->log(LOG_WARNING, 'queue item for notice that does not exist');
173 if (!$this->start()) {
176 $this->log(LOG_INFO, 'checking for queued notices');
177 if (common_config('queue','subsystem') == 'stomp') {
178 $this->stomp_dispatch();
181 $this->db_dispatch();
183 if (!$this->finish()) {
189 function idle($timeout=0)
196 function clear_old_claims()
198 $qi = new Queue_item();
199 $qi->transport = $this->transport();
200 $qi->whereAdd('now() - claimed > '.CLAIM_TIMEOUT);
201 $qi->update(DB_DATAOBJECT_WHEREADD_ONLY);
206 function log($level, $msg)
208 common_log($level, $this->class_name() . ' ('. $this->get_id() .'): '.$msg);