765 lines
24 KiB
PHP
765 lines
24 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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require_once 'Stomp/Exception.php';
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class StompQueueManager extends QueueManager
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{
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protected $servers;
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protected $username;
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protected $password;
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protected $base;
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protected $control;
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protected $useTransactions;
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protected $useAcks;
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protected $sites = array();
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protected $subscriptions = array();
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protected $cons = array(); // all open connections
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protected $disconnect = array();
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protected $transaction = array();
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protected $transactionCount = array();
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protected $defaultIdx = 0;
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function __construct()
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{
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parent::__construct();
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$server = common_config('queue', 'stomp_server');
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if (is_array($server)) {
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$this->servers = $server;
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} else {
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$this->servers = array($server);
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}
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$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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$this->control = common_config('queue', 'control_channel');
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$this->breakout = common_config('queue', 'breakout');
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$this->useTransactions = common_config('queue', 'stomp_transactions');
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$this->useAcks = common_config('queue', 'stomp_acks');
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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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* 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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* Currently only relevant for multi-site queue managers such as Stomp.
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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, $param='')
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{
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$message = $event;
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if ($param != '') {
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$message .= ':' . $param;
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}
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$this->_connect();
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$con = $this->cons[$this->defaultIdx];
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$result = $con->send($this->control,
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$message,
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array ('created' => common_sql_now()));
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if ($result) {
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$this->_log(LOG_INFO, "Sent control ping to queue daemons: $message");
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return true;
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} else {
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$this->_log(LOG_ERR, "Failed sending control ping to queue daemons: $message");
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return false;
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}
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}
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/**
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* Saves an object into the queue item table.
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*
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* @param mixed $object
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* @param string $queue
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* @param string $siteNickname optional override to drop into another site's queue
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*
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* @return boolean true on success
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* @throws StompException on connection or send error
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*/
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public function enqueue($object, $queue, $siteNickname=null)
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{
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$this->_connect();
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if (common_config('queue', 'stomp_enqueue_on')) {
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// We're trying to force all writes to a single server.
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// WARNING: this might do odd things if that server connection dies.
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$idx = array_search(common_config('queue', 'stomp_enqueue_on'),
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$this->servers);
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if ($idx === false) {
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common_log(LOG_ERR, 'queue stomp_enqueue_on setting does not match our server list.');
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$idx = $this->defaultIdx;
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}
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} else {
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$idx = $this->defaultIdx;
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}
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return $this->_doEnqueue($object, $queue, $idx, $siteNickname);
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}
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/**
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* Saves a notice object reference into the queue item table
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* on the given connection.
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*
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* @return boolean true on success
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* @throws StompException on connection or send error
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*/
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protected function _doEnqueue($object, $queue, $idx, $siteNickname=null)
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{
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$rep = $this->logrep($object);
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$envelope = array('site' => $siteNickname ? $siteNickname : common_config('site', 'nickname'),
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'handler' => $queue,
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'payload' => $this->encode($object));
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$msg = serialize($envelope);
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$props = array('created' => common_sql_now());
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if ($this->isPersistent($queue)) {
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$props['persistent'] = 'true';
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}
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$con = $this->cons[$idx];
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$host = $con->getServer();
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$target = $this->queueName($queue);
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$result = $con->send($target, $msg, $props);
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if (!$result) {
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$this->_log(LOG_ERR, "Error sending $rep to $queue queue on $host $target");
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return false;
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}
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$this->_log(LOG_DEBUG, "complete remote queueing $rep for $queue on $host $target");
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$this->stats('enqueued', $queue);
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return true;
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}
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/**
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* Determine whether messages to this queue should be marked as persistent.
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* Actual persistent storage depends on the queue server's configuration.
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* @param string $queue
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* @return bool
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*/
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protected function isPersistent($queue)
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{
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$mode = common_config('queue', 'stomp_persistent');
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if (is_array($mode)) {
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return in_array($queue, $mode);
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} else {
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return (bool)$mode;
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}
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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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$sockets = array();
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foreach ($this->cons as $con) {
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if ($con) {
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$sockets[] = $con->getSocket();
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}
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}
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return $sockets;
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}
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/**
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* Get the Stomp connection object associated with the given socket.
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* @param resource $socket
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* @return int index into connections list
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* @throws Exception
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*/
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protected function connectionFromSocket($socket)
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{
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foreach ($this->cons as $i => $con) {
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if ($con && $con->getSocket() === $socket) {
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return $i;
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}
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}
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throw new Exception(__CLASS__ . " asked to read from unrecognized socket");
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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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$idx = $this->connectionFromSocket($socket);
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$con = $this->cons[$idx];
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$host = $con->getServer();
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$this->defaultIdx = $idx;
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$ok = true;
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try {
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$frames = $con->readFrames();
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} catch (StompException $e) {
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$this->_log(LOG_ERR, "Lost connection to $host: " . $e->getMessage());
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fclose($socket); // ???
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$this->cons[$idx] = null;
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$this->transaction[$idx] = null;
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$this->disconnect[$idx] = time();
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return false;
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}
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foreach ($frames as $frame) {
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$dest = $frame->headers['destination'];
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if ($dest == $this->control) {
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if (!$this->handleControlSignal($frame)) {
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// We got a control event that requests a shutdown;
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// close out and stop handling anything else!
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break;
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}
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} else {
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$ok = $this->handleItem($frame) && $ok;
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}
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$this->ack($idx, $frame);
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$this->commit($idx);
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$this->begin($idx);
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}
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return $ok;
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}
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/**
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* Attempt to reconnect in background if we lost a connection.
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*/
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function idle()
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{
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$now = time();
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foreach ($this->cons as $idx => $con) {
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if (empty($con)) {
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$age = $now - $this->disconnect[$idx];
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if ($age >= 60) {
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$this->_reconnect($idx);
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}
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}
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}
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return true;
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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... If multiple queue servers
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* are configured for failover, we'll listen to all of them.
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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($master);
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$this->_connectAll();
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foreach ($this->cons as $i => $con) {
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if ($con) {
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$this->doSubscribe($con);
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$this->begin($i);
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}
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}
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return true;
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}
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/**
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* Close out any active connections.
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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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foreach ($this->cons as $i => $con) {
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if ($con) {
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$this->rollback($i);
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$con->disconnect();
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$this->cons[$i] = null;
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}
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}
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return true;
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}
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/**
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* Lazy open a single connection to Stomp queue server.
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* If multiple servers are configured, we let the Stomp client library
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* worry about finding a working connection among them.
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*/
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protected function _connect()
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{
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if (empty($this->cons)) {
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$list = $this->servers;
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if (count($list) > 1) {
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shuffle($list); // Randomize to spread load
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$url = 'failover://(' . implode(',', $list) . ')';
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} else {
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$url = $list[0];
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}
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$con = $this->_doConnect($url);
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$this->cons = array($con);
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$this->transactionCount = array(0);
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$this->transaction = array(null);
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$this->disconnect = array(null);
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}
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}
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/**
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* Lazy open connections to all Stomp servers, if in manual failover
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* mode. This means the queue servers don't speak to each other, so
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* we have to listen to all of them to make sure we get all events.
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*/
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protected function _connectAll()
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{
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if (!common_config('queue', 'stomp_manual_failover')) {
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return $this->_connect();
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}
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if (empty($this->cons)) {
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$this->cons = array();
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$this->transactionCount = array();
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$this->transaction = array();
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foreach ($this->servers as $idx => $server) {
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try {
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$this->cons[] = $this->_doConnect($server);
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$this->disconnect[] = null;
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} catch (Exception $e) {
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// s'okay, we'll live
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$this->cons[] = null;
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$this->disconnect[] = time();
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}
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$this->transactionCount[] = 0;
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$this->transaction[] = null;
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}
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if (empty($this->cons)) {
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throw new ServerException("No queue servers reachable...");
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return false;
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}
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}
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}
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/**
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* Attempt to manually reconnect to the Stomp server for the given
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* slot. If successful, set up our subscriptions on it.
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*/
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protected function _reconnect($idx)
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{
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try {
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$con = $this->_doConnect($this->servers[$idx]);
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} catch (Exception $e) {
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$this->_log(LOG_ERR, $e->getMessage());
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$con = null;
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}
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if ($con) {
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$this->cons[$idx] = $con;
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$this->disconnect[$idx] = null;
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$this->doSubscribe($con);
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$this->begin($idx);
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} else {
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// Try again later...
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$this->disconnect[$idx] = time();
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}
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}
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protected function _doConnect($server)
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{
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$this->_log(LOG_INFO, "Connecting to '$server' as '$this->username'...");
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$con = new LiberalStomp($server);
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if ($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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return $con;
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}
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/**
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* Set up all our raw queue subscriptions on the given connection
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* @param LiberalStomp $con
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*/
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protected function doSubscribe(LiberalStomp $con)
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{
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$host = $con->getServer();
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foreach ($this->subscriptions() as $sub) {
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$this->_log(LOG_INFO, "Subscribing to $sub on $host");
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$con->subscribe($sub);
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}
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}
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/**
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* Grab a full list of stomp-side queue subscriptions.
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* Will include:
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* - control broadcast channel
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* - shared group queues for active groups
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* - per-handler and per-site breakouts from $config['queue']['breakout']
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* that are rooted in the active groups.
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*
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* @return array of strings
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*/
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protected function subscriptions()
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{
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$subs = array();
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$subs[] = $this->control;
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foreach ($this->activeGroups as $group) {
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$subs[] = $this->base . $group;
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}
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foreach ($this->breakout as $spec) {
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$parts = explode('/', $spec);
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if (count($parts) < 2 || count($parts) > 3) {
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common_log(LOG_ERR, "Bad queue breakout specifier $spec");
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}
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if (in_array($parts[0], $this->activeGroups)) {
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$subs[] = $this->base . $spec;
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}
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}
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return array_unique($subs);
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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 $frame
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* @return bool success
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*/
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protected function handleItem($frame)
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{
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$host = $this->cons[$this->defaultIdx]->getServer();
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$message = unserialize($frame->body);
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if ($message === false) {
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$this->_log(LOG_ERR, "Can't unserialize frame: {$frame->body}");
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$this->_log(LOG_ERR, "Unserializable frame length: " . strlen($frame->body));
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return false;
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}
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$site = $message['site'];
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$queue = $message['handler'];
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if ($this->isDeadletter($frame, $message)) {
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$this->stats('deadletter', $queue);
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return false;
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}
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// @fixme detect failing site switches
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$this->switchSite($site);
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try {
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$item = $this->decode($message['payload']);
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} catch (Exception $e) {
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$this->_log(LOG_ERR, "Skipping empty or deleted item in queue $queue from $host");
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$this->stats('baditem', $queue);
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return false;
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}
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$info = $this->logrep($item) . " posted at " .
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$frame->headers['created'] . " in queue $queue from $host";
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$this->_log(LOG_DEBUG, "Dequeued $info");
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$handler = $this->getHandler($queue);
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if (!$handler) {
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$this->_log(LOG_ERR, "Missing handler class; skipping $info");
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$this->stats('badhandler', $queue);
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return false;
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}
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try {
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$ok = $handler->handle($item);
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} catch (Exception $e) {
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$this->_log(LOG_ERR, "Exception on queue $queue: " . $e->getMessage());
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$ok = false;
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}
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if ($ok) {
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$this->_log(LOG_INFO, "Successfully handled $info");
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$this->stats('handled', $queue);
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} else {
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$this->_log(LOG_WARNING, "Failed handling $info");
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// Requeing moves the item to the end of the line for its next try.
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// @fixme add a manual retry count
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$this->enqueue($item, $queue);
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$this->stats('requeued', $queue);
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}
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return $ok;
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}
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/**
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* Check if a redelivered message has been run through enough
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* that we're going to give up on it.
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*
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* @param StompFrame $frame
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* @param array $message unserialized message body
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* @return boolean true if we should discard
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*/
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protected function isDeadLetter($frame, $message)
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{
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if (isset($frame->headers['redelivered']) && $frame->headers['redelivered'] == 'true') {
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// Message was redelivered, possibly indicating a previous failure.
|
|
$msgId = $frame->headers['message-id'];
|
|
$site = $message['site'];
|
|
$queue = $message['handler'];
|
|
$msgInfo = "message $msgId for $site in queue $queue";
|
|
|
|
$deliveries = $this->incDeliveryCount($msgId);
|
|
if ($deliveries > common_config('queue', 'max_retries')) {
|
|
$info = "DEAD-LETTER FILE: Gave up after retry $deliveries on $msgInfo";
|
|
|
|
$outdir = common_config('queue', 'dead_letter_dir');
|
|
if ($outdir) {
|
|
$filename = $outdir . "/$site-$queue-" . rawurlencode($msgId);
|
|
$info .= ": dumping to $filename";
|
|
file_put_contents($filename, $message['payload']);
|
|
}
|
|
|
|
common_log(LOG_ERR, $info);
|
|
return true;
|
|
} else {
|
|
common_log(LOG_INFO, "retry $deliveries on $msgInfo");
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Update count of times we've re-encountered this message recently,
|
|
* triggered when we get a message marked as 'redelivered'.
|
|
*
|
|
* Requires a CLI-friendly cache configuration.
|
|
*
|
|
* @param string $msgId message-id header from message
|
|
* @return int number of retries recorded
|
|
*/
|
|
function incDeliveryCount($msgId)
|
|
{
|
|
$count = 0;
|
|
$cache = Cache::instance();
|
|
if ($cache) {
|
|
$key = 'statusnet:stomp:message-retries:' . $msgId;
|
|
$count = $cache->increment($key);
|
|
if (!$count) {
|
|
$count = 1;
|
|
$cache->set($key, $count, null, 3600);
|
|
$got = $cache->get($key);
|
|
}
|
|
}
|
|
return $count;
|
|
}
|
|
|
|
/**
|
|
* Process a control signal broadcast.
|
|
*
|
|
* @param int $idx connection index
|
|
* @param array $frame Stomp frame
|
|
* @return bool true to continue; false to stop further processing.
|
|
*/
|
|
protected function handleControlSignal($idx, $frame)
|
|
{
|
|
$message = trim($frame->body);
|
|
if (strpos($message, ':') !== false) {
|
|
list($event, $param) = explode(':', $message, 2);
|
|
} else {
|
|
$event = $message;
|
|
$param = '';
|
|
}
|
|
|
|
$shutdown = false;
|
|
|
|
if ($event == 'shutdown') {
|
|
$this->master->requestShutdown();
|
|
$shutdown = true;
|
|
} else if ($event == 'restart') {
|
|
$this->master->requestRestart();
|
|
$shutdown = true;
|
|
} else if ($event == 'update') {
|
|
$this->updateSiteConfig($param);
|
|
} else {
|
|
$this->_log(LOG_ERR, "Ignoring unrecognized control message: $message");
|
|
}
|
|
return $shutdown;
|
|
}
|
|
|
|
/**
|
|
* Switch site, if necessary, and reset current handler assignments
|
|
* @param string $site
|
|
*/
|
|
function switchSite($site)
|
|
{
|
|
if ($site != StatusNet::currentSite()) {
|
|
$this->stats('switch');
|
|
StatusNet::switchSite($site);
|
|
$this->initialize();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* (Re)load runtime configuration for a given site by nickname,
|
|
* triggered by a broadcast to the 'statusnet-control' topic.
|
|
*
|
|
* Configuration changes in database should update, but config
|
|
* files might not.
|
|
*
|
|
* @param array $frame Stomp frame
|
|
* @return bool true to continue; false to stop further processing.
|
|
*/
|
|
protected function updateSiteConfig($nickname)
|
|
{
|
|
$sn = Status_network::getKV('nickname', $nickname);
|
|
if ($sn) {
|
|
$this->switchSite($nickname);
|
|
if (!in_array($nickname, $this->sites)) {
|
|
$this->addSite();
|
|
}
|
|
$this->stats('siteupdate');
|
|
} else {
|
|
$this->_log(LOG_ERR, "Ignoring ping for unrecognized new site $nickname");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Combines the queue_basename from configuration with the
|
|
* group name for this queue to give eg:
|
|
*
|
|
* /queue/statusnet/main
|
|
* /queue/statusnet/main/distrib
|
|
* /queue/statusnet/xmpp/xmppout/site01
|
|
*
|
|
* @param string $queue
|
|
* @return string
|
|
*/
|
|
protected function queueName($queue)
|
|
{
|
|
$group = $this->queueGroup($queue);
|
|
$site = StatusNet::currentSite();
|
|
|
|
$specs = array("$group/$queue/$site",
|
|
"$group/$queue");
|
|
foreach ($specs as $spec) {
|
|
if (in_array($spec, $this->breakout)) {
|
|
return $this->base . $spec;
|
|
}
|
|
}
|
|
return $this->base . $group;
|
|
}
|
|
|
|
/**
|
|
* Get the breakout mode for the given queue on the current site.
|
|
*
|
|
* @param string $queue
|
|
* @return string one of 'shared', 'handler', 'site'
|
|
*/
|
|
protected function breakoutMode($queue)
|
|
{
|
|
$breakout = common_config('queue', 'breakout');
|
|
if (isset($breakout[$queue])) {
|
|
return $breakout[$queue];
|
|
} else if (isset($breakout['*'])) {
|
|
return $breakout['*'];
|
|
} else {
|
|
return 'shared';
|
|
}
|
|
}
|
|
|
|
protected function begin($idx)
|
|
{
|
|
if ($this->useTransactions) {
|
|
if (!empty($this->transaction[$idx])) {
|
|
throw new Exception("Tried to start transaction in the middle of a transaction");
|
|
}
|
|
$this->transactionCount[$idx]++;
|
|
$this->transaction[$idx] = $this->master->id . '-' . $this->transactionCount[$idx] . '-' . time();
|
|
$this->cons[$idx]->begin($this->transaction[$idx]);
|
|
}
|
|
}
|
|
|
|
protected function ack($idx, $frame)
|
|
{
|
|
if ($this->useAcks) {
|
|
if ($this->useTransactions) {
|
|
if (empty($this->transaction[$idx])) {
|
|
throw new Exception("Tried to ack but not in a transaction");
|
|
}
|
|
$this->cons[$idx]->ack($frame, $this->transaction[$idx]);
|
|
} else {
|
|
$this->cons[$idx]->ack($frame);
|
|
}
|
|
}
|
|
}
|
|
|
|
protected function commit($idx)
|
|
{
|
|
if ($this->useTransactions) {
|
|
if (empty($this->transaction[$idx])) {
|
|
throw new Exception("Tried to commit but not in a transaction");
|
|
}
|
|
$this->cons[$idx]->commit($this->transaction[$idx]);
|
|
$this->transaction[$idx] = null;
|
|
}
|
|
}
|
|
|
|
protected function rollback($idx)
|
|
{
|
|
if ($this->useTransactions) {
|
|
if (empty($this->transaction[$idx])) {
|
|
throw new Exception("Tried to rollback but not in a transaction");
|
|
}
|
|
$this->cons[$idx]->commit($this->transaction[$idx]);
|
|
$this->transaction[$idx] = null;
|
|
}
|
|
}
|
|
}
|
|
|