380 lines
12 KiB
PHP
380 lines
12 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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protected $ignoredTransports = array();
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/**
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* Factory function to pull the appropriate QueueManager object
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* for this site's configuration. It can then be used to queue
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* events for later processing or to spawn a processing loop.
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*
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* Plugins can add to the built-in types by hooking StartNewQueueManager.
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*
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* @return QueueManager
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*/
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public static function get()
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{
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if (empty(self::$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 '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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// except if it begins with '<', because then it is XML.
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if (is_string($object) &&
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substr($object, 0, 1) != '<' &&
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!is_numeric($object))
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{
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$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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}
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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($queues);
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}
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function getIgnoredTransports()
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{
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return array_keys($this->ignoredTransports);
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}
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function ignoreTransport($transport)
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{
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// key is used for uniqueness, value doesn't mean anything
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$this->ignoredTransports[$transport] = true;
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}
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/**
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* Initialize the list of queue handlers for the current site.
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*
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* @event StartInitializeQueueManager
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* @event EndInitializeQueueManager
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*/
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function initialize()
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{
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$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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