gnu-social/lib/dbqueuemanager.php
2016-08-16 20:27:41 +02:00

160 lines
5.4 KiB
PHP

<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Simple-minded queue manager for storing items in the database
*
* 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 StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Brion Vibber <brion@status.net>
* @copyright 2009-2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class DBQueueManager extends QueueManager
{
/**
* Saves an object reference into the queue item table.
* @return boolean true on success
* @throws ServerException on failure
*/
public function enqueue($object, $queue)
{
$qi = new Queue_item();
$qi->frame = $this->encode($object);
$qi->transport = $queue;
$qi->created = common_sql_now();
$result = $qi->insert();
if ($result === false) {
common_log_db_error($qi, 'INSERT', __FILE__);
throw new ServerException('DB error inserting queue item');
}
$this->stats('enqueued', $queue);
return true;
}
/**
* Poll every 10 seconds for new events during idle periods.
* We'll look in more often when there's data available.
*
* @return int seconds
*/
public function pollInterval()
{
return 10;
}
/**
* Run a polling cycle during idle processing in the input loop.
* @return boolean true if we should poll again for more data immediately
*/
public function poll()
{
//$this->_log(LOG_DEBUG, 'Checking for notices...');
$qi = Queue_item::top($this->activeQueues(), $this->getIgnoredTransports());
if (!$qi instanceof Queue_item) {
//$this->_log(LOG_DEBUG, 'No notices waiting; idling.');
return false;
}
try {
$item = $this->decode($qi->frame);
} catch (Exception $e) {
$this->_log(LOG_INFO, "[{$qi->transport}] Discarding: ".$e->getMessage());
$this->_done($qi);
return true;
}
$rep = $this->logrep($item);
$this->_log(LOG_DEBUG, "Got {$rep} for transport {$qi->transport}");
try {
$handler = $this->getHandler($qi->transport);
$result = $handler->handle($item);
} catch (NoQueueHandlerException $e) {
$this->noHandlerFound($qi, $rep);
return true;
} catch (NoResultException $e) {
$this->_log(LOG_ERR, "[{$qi->transport}:$rep] ".get_class($e).' thrown ('._ve($e->getMessage()).'), ignoring queue_item '._ve($qi->getID()));
$result = true;
} catch (AlreadyFulfilledException $e) {
$this->_log(LOG_ERR, "[{$qi->transport}:$rep] ".get_class($e).' thrown ('._ve($e->getMessage()).'), ignoring queue_item '._ve($qi->getID()));
$result = true;
} catch (Exception $e) {
$this->_log(LOG_ERR, "[{$qi->transport}:$rep] Exception (".get_class($e).') thrown: '._ve($e->getMessage()));
$result = false;
}
if ($result) {
$this->_log(LOG_INFO, "[{$qi->transport}:$rep] Successfully handled item");
$this->_done($qi);
} else {
$this->_log(LOG_INFO, "[{$qi->transport}:$rep] Failed to handle item");
$this->_fail($qi);
}
return true;
}
// What to do if no handler was found. For example, the OpportunisticQM
// should avoid deleting items just because it can't reach XMPP queues etc.
protected function noHandlerFound(Queue_item $qi, $rep=null) {
$this->_log(LOG_INFO, "[{$qi->transport}:{$rep}] No handler for queue {$qi->transport}; discarding.");
$this->_done($qi);
}
/**
* Delete our claimed item from the queue after successful processing.
*
* @param QueueItem $qi
*/
protected function _done(Queue_item $qi)
{
if (empty($qi->claimed)) {
$this->_log(LOG_WARNING, "Reluctantly releasing unclaimed queue item {$qi->id} from {$qi->transport}");
}
$qi->delete();
$this->stats('handled', $qi->transport);
}
/**
* Free our claimed queue item for later reprocessing in case of
* temporary failure.
*
* @param QueueItem $qi
*/
protected function _fail(Queue_item $qi, $releaseOnly=false)
{
if (empty($qi->claimed)) {
$this->_log(LOG_WARNING, "[{$qi->transport}:item {$qi->id}] Ignoring failure for unclaimed queue item");
} else {
$qi->releaseClaim();
}
if (!$releaseOnly) {
$this->stats('error', $qi->transport);
}
}
}