forked from GNUsocial/gnu-social
415 lines
12 KiB
PHP
415 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 queue 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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* @copyright 2009 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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require_once 'Stomp.php';
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class StompQueueManager extends QueueManager
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{
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var $server = null;
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var $username = null;
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var $password = null;
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var $base = null;
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var $con = null;
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protected $sites = array();
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protected $useTransactions = true;
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protected $transaction = null;
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protected $transactionCount = 0;
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function __construct()
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{
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parent::__construct();
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$this->server = common_config('queue', 'stomp_server');
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$this->username = common_config('queue', 'stomp_username');
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$this->password = common_config('queue', 'stomp_password');
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$this->base = common_config('queue', 'queue_basename');
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}
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/**
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* Tell the i/o master we only need a single instance to cover
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* all sites running in this process.
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*/
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public static function multiSite()
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{
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return IoManager::INSTANCE_PER_PROCESS;
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}
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/**
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* Record each site we'll be handling input for in this process,
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* so we can listen to the necessary queues for it.
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*
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* @fixme possibly actually do subscription here to save another
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* loop over all sites later?
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* @fixme possibly don't assume it's the current site
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*/
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public function addSite($server)
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{
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$this->sites[] = $server;
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$this->initialize();
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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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$handlers = $this->handlers[common_config('site', 'server')];
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if (isset($handlers[$queue])) {
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$class = $handlers[$queue];
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if (class_exists($class)) {
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return new $class();
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} else {
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common_log(LOG_ERR, "Nonexistent handler class '$class' for queue '$queue'");
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}
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} else {
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common_log(LOG_ERR, "Requested handler for unkown queue '$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 all registered queue transport names.
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*
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* @return array of strings
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*/
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function getQueues()
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{
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$group = $this->activeGroup();
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$site = common_config('site', 'server');
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if (empty($this->groups[$site][$group])) {
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return array();
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} else {
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return array_keys($this->groups[$site][$group]);
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}
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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
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* @param string $group
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*/
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public function connect($transport, $class, $group='queuedaemon')
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{
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$this->handlers[common_config('site', 'server')][$transport] = $class;
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$this->groups[common_config('site', 'server')][$group][$transport] = $class;
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}
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/**
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* Saves a notice object reference into the queue item table.
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* @return boolean true on success
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*/
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public function enqueue($object, $queue)
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{
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$msg = $this->encode($object);
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$rep = $this->logrep($object);
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$this->_connect();
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// XXX: serialize and send entire notice
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$result = $this->con->send($this->queueName($queue),
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$msg, // BODY of the message
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array ('created' => common_sql_now()));
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if (!$result) {
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common_log(LOG_ERR, "Error sending $rep to $queue queue");
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return false;
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}
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common_log(LOG_DEBUG, "complete remote queueing $rep for $queue");
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$this->stats('enqueued', $queue);
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}
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/**
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* Send any sockets we're listening on to the IO manager
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* to wait for input.
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*
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* @return array of resources
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*/
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public function getSockets()
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{
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return array($this->con->getSocket());
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}
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/**
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* We've got input to handle on our socket!
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* Read any waiting Stomp frame(s) and process them.
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*
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* @param resource $socket
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* @return boolean ok on success
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*/
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public function handleInput($socket)
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{
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assert($socket === $this->con->getSocket());
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$ok = true;
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$frames = $this->con->readFrames();
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foreach ($frames as $frame) {
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$ok = $ok && $this->_handleItem($frame);
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}
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return $ok;
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}
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/**
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* Initialize our connection and subscribe to all the queues
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* we're going to need to handle...
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*
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* Side effects: in multi-site mode, may reset site configuration.
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*
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* @param IoMaster $master process/event controller
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* @return bool return false on failure
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*/
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public function start($master)
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{
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parent::start($master);
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if ($this->sites) {
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foreach ($this->sites as $server) {
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StatusNet::init($server);
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$this->doSubscribe();
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}
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} else {
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$this->doSubscribe();
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}
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$this->begin();
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return true;
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}
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/**
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* Subscribe to all the queues we're going to need to handle...
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*
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* Side effects: in multi-site mode, may reset site configuration.
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*
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* @return bool return false on failure
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*/
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public function finish()
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{
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// If there are any outstanding delivered messages we haven't processed,
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// free them for another thread to take.
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$this->rollback();
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if ($this->sites) {
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foreach ($this->sites as $server) {
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StatusNet::init($server);
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$this->doUnsubscribe();
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}
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} else {
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$this->doUnsubscribe();
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}
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return true;
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}
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/**
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* Lazy open connection to Stomp queue server.
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*/
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protected function _connect()
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{
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if (empty($this->con)) {
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$this->_log(LOG_INFO, "Connecting to '$this->server' as '$this->username'...");
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$this->con = new LiberalStomp($this->server);
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if ($this->con->connect($this->username, $this->password)) {
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$this->_log(LOG_INFO, "Connected.");
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} else {
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$this->_log(LOG_ERR, 'Failed to connect to queue server');
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throw new ServerException('Failed to connect to queue server');
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}
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}
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}
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/**
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* Subscribe to all enabled notice queues for the current site.
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*/
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protected function doSubscribe()
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{
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$this->_connect();
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foreach ($this->getQueues() as $queue) {
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$rawqueue = $this->queueName($queue);
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$this->_log(LOG_INFO, "Subscribing to $rawqueue");
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$this->con->subscribe($rawqueue);
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}
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}
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/**
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* Subscribe from all enabled notice queues for the current site.
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*/
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protected function doUnsubscribe()
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{
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$this->_connect();
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foreach ($this->getQueues() as $queue) {
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$this->con->unsubscribe($this->queueName($queue));
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}
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}
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/**
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* Handle and acknowledge an event that's come in through a queue.
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*
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* If the queue handler reports failure, the message is requeued for later.
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* Missing notices or handler classes will drop the message.
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*
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* Side effects: in multi-site mode, may reset site configuration to
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* match the site that queued the event.
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*
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* @param StompFrame $frame
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* @return bool
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*/
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protected function _handleItem($frame)
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{
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list($site, $queue) = $this->parseDestination($frame->headers['destination']);
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if ($site != common_config('site', 'server')) {
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$this->stats('switch');
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StatusNet::init($site);
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}
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$item = $this->decode($frame->body);
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$handler = $this->getHandler($queue);
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if (!$handler) {
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$this->_log(LOG_ERROR, "Missing handler class; skipping $info");
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$this->ack($frame);
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$this->commit();
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$this->begin();
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$this->stats('badhandler', $queue);
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return false;
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}
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$ok = $handler->handle($item);
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if (!$ok) {
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$this->_log(LOG_WARNING, "Failed handling $info");
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// FIXME we probably shouldn't have to do
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// this kind of queue management ourselves;
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// if we don't ack, it should resend...
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$this->ack($frame);
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$this->enqueue($item, $queue);
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$this->commit();
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$this->begin();
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$this->stats('requeued', $queue);
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return false;
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}
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$this->_log(LOG_INFO, "Successfully handled $info");
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$this->ack($frame);
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$this->commit();
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$this->begin();
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$this->stats('handled', $queue);
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return true;
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}
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/**
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* Combines the queue_basename from configuration with the
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* site server name and queue name to give eg:
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*
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* /queue/statusnet/identi.ca/sms
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*
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* @param string $queue
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* @return string
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*/
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protected function queueName($queue)
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{
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return common_config('queue', 'queue_basename') .
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common_config('site', 'server') . '/' . $queue;
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}
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/**
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* Returns the site and queue name from the server-side queue.
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*
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* @param string queue destination (eg '/queue/statusnet/identi.ca/sms')
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* @return array of site and queue: ('identi.ca','sms') or false if unrecognized
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*/
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protected function parseDestination($dest)
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{
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$prefix = common_config('queue', 'queue_basename');
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if (substr($dest, 0, strlen($prefix)) == $prefix) {
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$rest = substr($dest, strlen($prefix));
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return explode("/", $rest, 2);
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} else {
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common_log(LOG_ERR, "Got a message from unrecognized stomp queue: $dest");
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return array(false, false);
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}
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}
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function _log($level, $msg)
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{
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common_log($level, 'StompQueueManager: '.$msg);
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}
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protected function begin()
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{
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if ($this->useTransactions) {
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if ($this->transaction) {
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throw new Exception("Tried to start transaction in the middle of a transaction");
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}
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$this->transactionCount++;
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$this->transaction = $this->master->id . '-' . $this->transactionCount . '-' . time();
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$this->con->begin($this->transaction);
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}
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}
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protected function ack($frame)
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{
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if ($this->useTransactions) {
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if (!$this->transaction) {
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throw new Exception("Tried to ack but not in a transaction");
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}
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}
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$this->con->ack($frame, $this->transaction);
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}
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protected function commit()
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{
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if ($this->useTransactions) {
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if (!$this->transaction) {
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throw new Exception("Tried to commit but not in a transaction");
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}
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$this->con->commit($this->transaction);
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$this->transaction = null;
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}
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}
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protected function rollback()
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{
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if ($this->useTransactions) {
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if (!$this->transaction) {
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throw new Exception("Tried to rollback but not in a transaction");
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}
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$this->con->commit($this->transaction);
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$this->transaction = null;
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}
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}
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}
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