3 * StatusNet, the distributed open-source microblogging tool
5 * Abstract class for queue managers
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17 * GNU Affero General Public License for more details.
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22 * @category QueueManager
24 * @author Evan Prodromou <evan@status.net>
25 * @author Sarven Capadisli <csarven@status.net>
26 * @copyright 2009 StatusNet, Inc.
27 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
28 * @link http://status.net/
31 require_once 'Stomp.php';
34 class StompQueueManager extends QueueManager
42 protected $master = null;
43 protected $sites = array();
45 function __construct()
47 parent::__construct();
48 $this->server = common_config('queue', 'stomp_server');
49 $this->username = common_config('queue', 'stomp_username');
50 $this->password = common_config('queue', 'stomp_password');
51 $this->base = common_config('queue', 'queue_basename');
55 * Tell the i/o master we only need a single instance to cover
56 * all sites running in this process.
58 public static function multiSite()
60 return IoManager::INSTANCE_PER_PROCESS;
64 * Record each site we'll be handling input for in this process,
65 * so we can listen to the necessary queues for it.
67 * @fixme possibly actually do subscription here to save another
68 * loop over all sites later?
70 public function addSite($server)
72 $this->sites[] = $server;
76 * Saves a notice object reference into the queue item table.
77 * @return boolean true on success
79 public function enqueue($object, $queue)
85 // XXX: serialize and send entire notice
87 $result = $this->con->send($this->queueName($queue),
88 $notice->id, // BODY of the message
89 array ('created' => $notice->created));
92 common_log(LOG_ERR, 'Error sending to '.$queue.' queue');
96 common_log(LOG_DEBUG, 'complete remote queueing notice ID = '
97 . $notice->id . ' for ' . $queue);
98 $this->stats('enqueued', $queue);
102 * Send any sockets we're listening on to the IO manager
105 * @return array of resources
107 public function getSockets()
109 return array($this->con->getSocket());
113 * We've got input to handle on our socket!
114 * Read any waiting Stomp frame(s) and process them.
116 * @param resource $socket
117 * @return boolean ok on success
119 public function handleInput($socket)
121 assert($socket === $this->con->getSocket());
123 $frames = $this->con->readFrames();
124 foreach ($frames as $frame) {
125 $ok = $ok && $this->_handleNotice($frame);
131 * Initialize our connection and subscribe to all the queues
132 * we're going to need to handle...
134 * Side effects: in multi-site mode, may reset site configuration.
136 * @param IoMaster $master process/event controller
137 * @return bool return false on failure
139 public function start($master)
141 parent::start($master);
143 foreach ($this->sites as $server) {
144 StatusNet::init($server);
145 $this->doSubscribe();
148 $this->doSubscribe();
154 * Subscribe to all the queues we're going to need to handle...
156 * Side effects: in multi-site mode, may reset site configuration.
158 * @return bool return false on failure
160 public function finish()
163 foreach ($this->sites as $server) {
164 StatusNet::init($server);
165 $this->doUnsubscribe();
168 $this->doUnsubscribe();
174 * Lazy open connection to Stomp queue server.
176 protected function _connect()
178 if (empty($this->con)) {
179 $this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
180 $this->con = new LiberalStomp($this->server);
182 if ($this->con->connect($this->username, $this->password)) {
183 $this->_log(LOG_INFO, "Connected.");
185 $this->_log(LOG_ERR, 'Failed to connect to queue server');
186 throw new ServerException('Failed to connect to queue server');
192 * Subscribe to all enabled notice queues for the current site.
194 protected function doSubscribe()
197 foreach ($this->getQueues() as $queue) {
198 $rawqueue = $this->queueName($queue);
199 $this->_log(LOG_INFO, "Subscribing to $rawqueue");
200 $this->con->subscribe($rawqueue);
205 * Subscribe from all enabled notice queues for the current site.
207 protected function doUnsubscribe()
210 foreach ($this->getQueues() as $queue) {
211 $this->con->unsubscribe($this->queueName($queue));
216 * Handle and acknowledge a notice event that's come in through a queue.
218 * If the queue handler reports failure, the message is requeued for later.
219 * Missing notices or handler classes will drop the message.
221 * Side effects: in multi-site mode, may reset site configuration to
222 * match the site that queued the event.
224 * @param StompFrame $frame
227 protected function _handleNotice($frame)
229 list($site, $queue) = $this->parseDestination($frame->headers['destination']);
230 if ($site != common_config('site', 'server')) {
231 $this->stats('switch');
232 StatusNet::init($site);
235 $id = intval($frame->body);
236 $info = "notice $id posted at {$frame->headers['created']} in queue $queue";
238 $notice = Notice::staticGet('id', $id);
239 if (empty($notice)) {
240 $this->_log(LOG_WARNING, "Skipping missing $info");
241 $this->con->ack($frame);
242 $this->stats('badnotice', $queue);
246 $handler = $this->getHandler($queue);
248 $this->_log(LOG_ERROR, "Missing handler class; skipping $info");
249 $this->con->ack($frame);
250 $this->stats('badhandler', $queue);
254 $ok = $handler->handle_notice($notice);
257 $this->_log(LOG_WARNING, "Failed handling $info");
258 // FIXME we probably shouldn't have to do
259 // this kind of queue management ourselves;
260 // if we don't ack, it should resend...
261 $this->con->ack($frame);
262 $this->enqueue($notice, $queue);
263 $this->stats('requeued', $queue);
267 $this->_log(LOG_INFO, "Successfully handled $info");
268 $this->con->ack($frame);
269 $this->stats('handled', $queue);
274 * Combines the queue_basename from configuration with the
275 * site server name and queue name to give eg:
277 * /queue/statusnet/identi.ca/sms
279 * @param string $queue
282 protected function queueName($queue)
284 return common_config('queue', 'queue_basename') .
285 common_config('site', 'server') . '/' . $queue;
289 * Returns the site and queue name from the server-side queue.
291 * @param string queue destination (eg '/queue/statusnet/identi.ca/sms')
292 * @return array of site and queue: ('identi.ca','sms') or false if unrecognized
294 protected function parseDestination($dest)
296 $prefix = common_config('queue', 'queue_basename');
297 if (substr($dest, 0, strlen($prefix)) == $prefix) {
298 $rest = substr($dest, strlen($prefix));
299 return explode("/", $rest, 2);
301 common_log(LOG_ERR, "Got a message from unrecognized stomp queue: $dest");
302 return array(false, false);
306 function _log($level, $msg)
308 common_log($level, 'StompQueueManager: '.$msg);