0cd93c2761
Generally the Cron plugin will run if there's still execution time for
1 second since starting the Action processing. If you want to change
this (such as disabling, 0 seconds, or maybe running bigger chunks,
for like 4 seconds) you can do this, where 'n' is time in seconds.
addPlugin('Cron', array('secs_per_action', n));
Add 'rel_to_pageload'=>false to the array if you want to run the queue
for a certain amount of seconds _despite_ maybe already having run that
long in the previous parts of Action processing.
Perhaps you want to run the cron script remotely, using a machine capable
of background processing (or locally, to avoid running daemon processes),
simply do an HTTP GET request to the route /main/cron of your GNU social.
Setting secs_per_action to 0 in the plugin config will imply that you run
all your queue handling by calling /main/cron (which runs as long as it can).
/main/cron will output "0" if it has finished processing, "1" if it should
be called again to complete processing (because it ran out of time due to
PHP's max_execution_time INI setting).
The Cron plugin also runs events as close to hourly, daily and weekly
as you get, based on the opportunistic method of running whenever a user
visits the site. This means of course that the cron events should be as
fast as possible, not only to avoid delaying page load for users but
also to minimize the risk of running into PHP's max_execution_time. One
suggestion is to only use the events to add new queue items for later processing.
These events are called CronHourly, CronDaily, CronWeekly - however there
is no guarantee that all events will execute, so some kind of failsafe,
transaction-ish method must be implemented in the future.
369 lines
11 KiB
PHP
369 lines
11 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Abstract class for i/o managers
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category QueueManager
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @author Sarven Capadisli <csarven@status.net>
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* @author Brion Vibber <brion@status.net>
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* @copyright 2009-2010 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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/**
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* Completed child classes must implement the enqueue() method.
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*
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* For background processing, classes should implement either socket-based
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* input (handleInput(), getSockets()) or idle-loop polling (idle()).
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*/
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abstract class QueueManager extends IoManager
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{
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static $qm = null;
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protected $master = null;
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protected $handlers = array();
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protected $groups = array();
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protected $activeGroups = array();
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/**
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* Factory function to pull the appropriate QueueManager object
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* for this site's configuration. It can then be used to queue
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* events for later processing or to spawn a processing loop.
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*
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* Plugins can add to the built-in types by hooking StartNewQueueManager.
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*
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* @return QueueManager
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*/
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public static function get()
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{
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if (empty(self::$qm)) {
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if (Event::handle('StartNewQueueManager', array(&self::$qm))) {
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$enabled = common_config('queue', 'enabled');
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$type = common_config('queue', 'subsystem');
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if (!$enabled) {
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// does everything immediately
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self::$qm = new UnQueueManager();
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} else {
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switch ($type) {
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case 'cron':
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self::$qm = new CronQueueManager();
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break;
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case 'db':
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self::$qm = new DBQueueManager();
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break;
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case 'stomp':
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self::$qm = new StompQueueManager();
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break;
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default:
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throw new ServerException("No queue manager class for type '$type'");
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}
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}
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}
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}
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return self::$qm;
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}
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/**
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* @fixme wouldn't necessarily work with other class types.
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* Better to change the interface...?
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*/
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public static function multiSite()
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{
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if (common_config('queue', 'subsystem') == 'stomp') {
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return IoManager::INSTANCE_PER_PROCESS;
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} else {
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return IoManager::SINGLE_ONLY;
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}
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}
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function __construct()
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{
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$this->initialize();
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}
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/**
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* Optional; ping any running queue handler daemons with a notification
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* such as announcing a new site to handle or requesting clean shutdown.
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* This avoids having to restart all the daemons manually to update configs
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* and such.
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*
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* Called from scripts/queuectl.php controller utility.
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*
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* @param string $event event key
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* @param string $param optional parameter to append to key
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* @return boolean success
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*/
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public function sendControlSignal($event, $param='')
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{
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throw new Exception(get_class($this) . " does not support control signals.");
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}
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/**
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* Store an object (usually/always a Notice) into the given queue
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* for later processing. No guarantee is made on when it will be
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* processed; it could be immediately or at some unspecified point
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* in the future.
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*
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* Must be implemented by any queue manager.
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*
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* @param Notice $object
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* @param string $queue
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*/
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abstract function enqueue($object, $queue);
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/**
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* Build a representation for an object for logging
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* @param mixed
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* @return string
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*/
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function logrep($object) {
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if (is_object($object)) {
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$class = get_class($object);
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if (isset($object->id)) {
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return "$class $object->id";
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}
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return $class;
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} elseif (is_string($object)) {
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$len = strlen($object);
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$fragment = mb_substr($object, 0, 32);
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if (mb_strlen($object) > 32) {
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$fragment .= '...';
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}
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return "string '$fragment' ($len bytes)";
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} elseif (is_array($object)) {
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return 'array with ' . count($object) .
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' elements (keys:[' . implode(',', array_keys($object)) . '])';
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}
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return strval($object);
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}
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/**
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* Encode an object for queued storage.
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*
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* @param mixed $item
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* @return string
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*/
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protected function encode($item)
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{
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return serialize($item);
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}
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/**
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* Decode an object from queued storage.
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* Accepts notice reference entries and serialized items.
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*
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* @param string
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* @return mixed
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*/
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protected function decode($frame)
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{
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$object = unserialize($frame);
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// If it is a string, we really store a JSON object in there
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if (is_string($object)) {
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$json = json_decode($object);
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if ($json === null) {
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throw new Exception('Bad frame in queue item');
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}
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// The JSON object has a type parameter which contains the class
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if (empty($json->type)) {
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throw new Exception('Type not specified for queue item');
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}
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if (!is_a($json->type, 'Managed_DataObject', true)) {
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throw new Exception('Managed_DataObject class does not exist for queue item');
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}
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// And each of these types should have a unique id (or uri)
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if (isset($json->id) && !empty($json->id)) {
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$object = call_user_func(array($json->type, 'getKV'), 'id', $json->id);
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} elseif (isset($json->uri) && !empty($json->uri)) {
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$object = call_user_func(array($json->type, 'getKV'), 'uri', $json->uri);
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}
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// But if no object was found, there's nothing we can handle
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if (!$object instanceof Managed_DataObject) {
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throw new Exception('Queue item frame referenced a non-existant object');
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}
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}
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// If the frame was not a string, it's either an array or an object.
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return $object;
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}
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/**
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* Instantiate the appropriate QueueHandler class for the given queue.
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*
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* @param string $queue
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* @return mixed QueueHandler or null
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*/
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function getHandler($queue)
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{
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if (isset($this->handlers[$queue])) {
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$class = $this->handlers[$queue];
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if(is_object($class)) {
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return $class;
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} else if (class_exists($class)) {
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return new $class();
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} else {
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$this->_log(LOG_ERR, "Nonexistent handler class '$class' for queue '$queue'");
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}
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} else {
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$this->_log(LOG_ERR, "Requested handler for unkown queue '$queue'");
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}
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return null;
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}
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/**
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* Get a list of registered queue transport names to be used
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* for listening in this daemon.
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*
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* @return array of strings
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*/
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function activeQueues()
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{
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$queues = array();
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foreach ($this->activeGroups as $group) {
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if (isset($this->groups[$group])) {
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$queues = array_merge($queues, $this->groups[$group]);
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}
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}
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return array_keys($queues);
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}
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/**
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* Initialize the list of queue handlers for the current site.
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*
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* @event StartInitializeQueueManager
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* @event EndInitializeQueueManager
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*/
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function initialize()
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{
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$this->handlers = array();
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$this->groups = array();
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$this->groupsByTransport = array();
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if (Event::handle('StartInitializeQueueManager', array($this))) {
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$this->connect('distrib', 'DistribQueueHandler');
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$this->connect('ping', 'PingQueueHandler');
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if (common_config('sms', 'enabled')) {
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$this->connect('sms', 'SmsQueueHandler');
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}
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// Background user management tasks...
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$this->connect('deluser', 'DelUserQueueHandler');
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$this->connect('feedimp', 'FeedImporter');
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$this->connect('actimp', 'ActivityImporter');
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$this->connect('acctmove', 'AccountMover');
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$this->connect('actmove', 'ActivityMover');
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// For compat with old plugins not registering their own handlers.
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$this->connect('plugin', 'PluginQueueHandler');
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}
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Event::handle('EndInitializeQueueManager', array($this));
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}
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/**
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* Register a queue transport name and handler class for your plugin.
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* Only registered transports will be reliably picked up!
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*
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* @param string $transport
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* @param string $class class name or object instance
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* @param string $group
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*/
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public function connect($transport, $class, $group='main')
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{
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$this->handlers[$transport] = $class;
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$this->groups[$group][$transport] = $class;
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$this->groupsByTransport[$transport] = $group;
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}
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/**
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* Set the active group which will be used for listening.
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* @param string $group
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*/
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function setActiveGroup($group)
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{
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$this->activeGroups = array($group);
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}
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/**
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* Set the active group(s) which will be used for listening.
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* @param array $groups
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*/
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function setActiveGroups($groups)
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{
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$this->activeGroups = $groups;
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}
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/**
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* @return string queue group for this queue
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*/
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function queueGroup($queue)
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{
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if (isset($this->groupsByTransport[$queue])) {
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return $this->groupsByTransport[$queue];
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} else {
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throw new Exception("Requested group for unregistered transport $queue");
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}
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}
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/**
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* Send a statistic ping to the queue monitoring system,
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* optionally with a per-queue id.
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*
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* @param string $key
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* @param string $queue
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*/
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function stats($key, $queue=false)
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{
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$owners = array();
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if ($queue) {
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$owners[] = "queue:$queue";
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$owners[] = "site:" . common_config('site', 'server');
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}
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if (isset($this->master)) {
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$this->master->stats($key, $owners);
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} else {
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$monitor = new QueueMonitor();
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$monitor->stats($key, $owners);
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}
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}
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protected function _log($level, $msg)
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{
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$class = get_class($this);
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if ($this->activeGroups) {
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$groups = ' (' . implode(',', $this->activeGroups) . ')';
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} else {
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$groups = '';
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}
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common_log($level, "$class$groups: $msg");
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}
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}
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