0e852def6a
Queue handlers for XMPP individual & firehose output now send their XML stanzas to another output queue instead of connecting directly to the chat server. This lets us have as many general processing threads as we need, while all actual XMPP input and output go through a single daemon with a single connection open. This avoids problems with multiple connected resources: * multiple windows shown in some chat clients (psi, gajim, kopete) * extra load on server * incoming message delivery forwarding issues Database changes: * queue_item drops 'notice_id' in favor of a 'frame' blob. This is based on Craig Andrews' work branch to generalize queues to take any object, but conservatively leaving out the serialization for now. Table updater (preserves any existing queued items) in db/rc3to09.sql Code changes to watch out for: * Queue handlers should now define a handle() method instead of handle_notice() * QueueDaemon and XmppDaemon now share common i/o (IoMaster) and respawning thread management (RespawningDaemon) infrastructure. * The polling XmppConfirmManager has been dropped, as the message is queued directly when saving IM settings. * Enable $config['queue']['debug_memory'] to output current memory usage at each run through the event loop to watch for memory leaks To do: * Adapt XMPP i/o to component connection mode for multi-site support. * XMPP input can also be broken out to a queue, which would allow the actual notice save etc to be handled by general queue threads. * Make sure there are no problems with simply pushing serialized Notice objects to queues. * Find a way to improve interactive performance of the database-backed queue handler; polling is pretty painful to XMPP. * Possibly redo the way QueueHandlers are injected into a QueueManager. The grouping used to split out the XMPP output queue is a bit awkward.
359 lines
11 KiB
PHP
359 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* StatusNet, the distributed open-source microblogging tool
|
|
*
|
|
* I/O manager to wrap around socket-reading and polling queue & connection managers.
|
|
*
|
|
* PHP version 5
|
|
*
|
|
* LICENCE: This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* @category QueueManager
|
|
* @package StatusNet
|
|
* @author Brion Vibber <brion@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
abstract class IoMaster
|
|
{
|
|
public $id;
|
|
|
|
protected $multiSite = false;
|
|
protected $managers = array();
|
|
protected $singletons = array();
|
|
|
|
protected $pollTimeouts = array();
|
|
protected $lastPoll = array();
|
|
|
|
/**
|
|
* @param string $id process ID to use in logging/monitoring
|
|
*/
|
|
public function __construct($id)
|
|
{
|
|
$this->id = $id;
|
|
$this->monitor = new QueueMonitor();
|
|
}
|
|
|
|
public function init($multiSite=null)
|
|
{
|
|
if ($multiSite !== null) {
|
|
$this->multiSite = $multiSite;
|
|
}
|
|
if ($this->multiSite) {
|
|
$this->sites = $this->findAllSites();
|
|
} else {
|
|
$this->sites = array(common_config('site', 'server'));
|
|
}
|
|
|
|
if (empty($this->sites)) {
|
|
throw new Exception("Empty status_network table, cannot init");
|
|
}
|
|
|
|
foreach ($this->sites as $site) {
|
|
if ($site != common_config('site', 'server')) {
|
|
StatusNet::init($site);
|
|
}
|
|
$this->initManagers();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Initialize IoManagers for the currently configured site
|
|
* which are appropriate to this instance.
|
|
*
|
|
* Pass class names into $this->instantiate()
|
|
*/
|
|
abstract function initManagers();
|
|
|
|
/**
|
|
* Pull all local sites from status_network table.
|
|
* @return array of hostnames
|
|
*/
|
|
protected function findAllSites()
|
|
{
|
|
$hosts = array();
|
|
$sn = new Status_network();
|
|
$sn->find();
|
|
while ($sn->fetch()) {
|
|
$hosts[] = $sn->hostname;
|
|
}
|
|
return $hosts;
|
|
}
|
|
|
|
/**
|
|
* Instantiate an i/o manager class for the current site.
|
|
* If a multi-site capable handler is already present,
|
|
* we don't need to build a new one.
|
|
*
|
|
* @param string $class
|
|
*/
|
|
protected function instantiate($class)
|
|
{
|
|
if (isset($this->singletons[$class])) {
|
|
// Already instantiated a multi-site-capable handler.
|
|
// Just let it know it should listen to this site too!
|
|
$this->singletons[$class]->addSite(common_config('site', 'server'));
|
|
return;
|
|
}
|
|
|
|
$manager = $this->getManager($class);
|
|
|
|
if ($this->multiSite) {
|
|
$caps = $manager->multiSite();
|
|
if ($caps == IoManager::SINGLE_ONLY) {
|
|
throw new Exception("$class can't run with --all; aborting.");
|
|
}
|
|
if ($caps == IoManager::INSTANCE_PER_PROCESS) {
|
|
// Save this guy for later!
|
|
// We'll only need the one to cover multiple sites.
|
|
$this->singletons[$class] = $manager;
|
|
$manager->addSite(common_config('site', 'server'));
|
|
}
|
|
}
|
|
|
|
$this->managers[] = $manager;
|
|
}
|
|
|
|
protected function getManager($class)
|
|
{
|
|
return call_user_func(array($class, 'get'));
|
|
}
|
|
|
|
/**
|
|
* Basic run loop...
|
|
*
|
|
* Initialize all io managers, then sit around waiting for input.
|
|
* Between events or timeouts, pass control back to idle() method
|
|
* to allow for any additional background processing.
|
|
*/
|
|
function service()
|
|
{
|
|
$this->logState('init');
|
|
$this->start();
|
|
|
|
while (true) {
|
|
$timeouts = array_values($this->pollTimeouts);
|
|
$timeouts[] = 60; // default max timeout
|
|
|
|
// Wait for something on one of our sockets
|
|
$sockets = array();
|
|
$managers = array();
|
|
foreach ($this->managers as $manager) {
|
|
foreach ($manager->getSockets() as $socket) {
|
|
$sockets[] = $socket;
|
|
$managers[] = $manager;
|
|
}
|
|
$timeouts[] = intval($manager->timeout());
|
|
}
|
|
|
|
$timeout = min($timeouts);
|
|
if ($sockets) {
|
|
$read = $sockets;
|
|
$write = array();
|
|
$except = array();
|
|
$this->logState('listening');
|
|
common_log(LOG_DEBUG, "Waiting up to $timeout seconds for socket data...");
|
|
$ready = stream_select($read, $write, $except, $timeout, 0);
|
|
|
|
if ($ready === false) {
|
|
common_log(LOG_ERR, "Error selecting on sockets");
|
|
} else if ($ready > 0) {
|
|
foreach ($read as $socket) {
|
|
$index = array_search($socket, $sockets, true);
|
|
if ($index !== false) {
|
|
$this->logState('queue');
|
|
$managers[$index]->handleInput($socket);
|
|
} else {
|
|
common_log(LOG_ERR, "Saw input on a socket we didn't listen to");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($timeout > 0 && empty($sockets)) {
|
|
// If we had no listeners, sleep until the pollers' next requested wakeup.
|
|
common_log(LOG_DEBUG, "Sleeping $timeout seconds until next poll cycle...");
|
|
$this->logState('sleep');
|
|
sleep($timeout);
|
|
}
|
|
|
|
$this->logState('poll');
|
|
$this->poll();
|
|
|
|
$this->logState('idle');
|
|
$this->idle();
|
|
|
|
$memoryLimit = $this->softMemoryLimit();
|
|
if ($memoryLimit > 0) {
|
|
$usage = memory_get_usage();
|
|
if ($usage > $memoryLimit) {
|
|
common_log(LOG_INFO, "Queue thread hit soft memory limit ($usage > $memoryLimit); gracefully restarting.");
|
|
break;
|
|
} else if (common_config('queue', 'debug_memory')) {
|
|
common_log(LOG_DEBUG, "Memory usage $usage");
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->logState('shutdown');
|
|
$this->finish();
|
|
}
|
|
|
|
/**
|
|
* Return fully-parsed soft memory limit in bytes.
|
|
* @return intval 0 or -1 if not set
|
|
*/
|
|
function softMemoryLimit()
|
|
{
|
|
$softLimit = trim(common_config('queue', 'softlimit'));
|
|
if (substr($softLimit, -1) == '%') {
|
|
$limit = $this->parseMemoryLimit(ini_get('memory_limit'));
|
|
if ($limit > 0) {
|
|
return intval(substr($softLimit, 0, -1) * $limit / 100);
|
|
} else {
|
|
return -1;
|
|
}
|
|
} else {
|
|
return $this->parseMemoryLimit($softLimit);
|
|
}
|
|
return $softLimit;
|
|
}
|
|
|
|
/**
|
|
* Interpret PHP shorthand for memory_limit and friends.
|
|
* Why don't they just expose the actual numeric value? :P
|
|
* @param string $mem
|
|
* @return int
|
|
*/
|
|
public function parseMemoryLimit($mem)
|
|
{
|
|
// http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
|
|
$mem = strtolower(trim($mem));
|
|
$size = array('k' => 1024,
|
|
'm' => 1024*1024,
|
|
'g' => 1024*1024*1024);
|
|
if (empty($mem)) {
|
|
return 0;
|
|
} else if (is_numeric($mem)) {
|
|
return intval($mem);
|
|
} else {
|
|
$mult = substr($mem, -1);
|
|
if (isset($size[$mult])) {
|
|
return substr($mem, 0, -1) * $size[$mult];
|
|
} else {
|
|
return intval($mem);
|
|
}
|
|
}
|
|
}
|
|
|
|
function start()
|
|
{
|
|
foreach ($this->managers as $index => $manager) {
|
|
$manager->start($this);
|
|
// @fixme error check
|
|
if ($manager->pollInterval()) {
|
|
// We'll want to check for input on the first pass
|
|
$this->pollTimeouts[$index] = 0;
|
|
$this->lastPoll[$index] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
function finish()
|
|
{
|
|
foreach ($this->managers as $manager) {
|
|
$manager->finish();
|
|
// @fixme error check
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called during the idle portion of the runloop to see which handlers
|
|
*/
|
|
function poll()
|
|
{
|
|
foreach ($this->managers as $index => $manager) {
|
|
$interval = $manager->pollInterval();
|
|
if ($interval <= 0) {
|
|
// Not a polling manager.
|
|
continue;
|
|
}
|
|
|
|
if (isset($this->pollTimeouts[$index])) {
|
|
$timeout = $this->pollTimeouts[$index];
|
|
if (time() - $this->lastPoll[$index] < $timeout) {
|
|
// Not time to poll yet.
|
|
continue;
|
|
}
|
|
} else {
|
|
$timeout = 0;
|
|
}
|
|
$hit = $manager->poll();
|
|
|
|
$this->lastPoll[$index] = time();
|
|
if ($hit) {
|
|
// Do the next poll quickly, there may be more input!
|
|
$this->pollTimeouts[$index] = 0;
|
|
} else {
|
|
// Empty queue. Exponential backoff up to the maximum poll interval.
|
|
if ($timeout > 0) {
|
|
$timeout = min($timeout * 2, $interval);
|
|
} else {
|
|
$timeout = 1;
|
|
}
|
|
$this->pollTimeouts[$index] = $timeout;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Called after each handled item or empty polling cycle.
|
|
* This is a good time to e.g. service your XMPP connection.
|
|
*/
|
|
function idle()
|
|
{
|
|
foreach ($this->managers as $manager) {
|
|
$manager->idle();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Send thread state update to the monitoring server, if configured.
|
|
*
|
|
* @param string $state ('init', 'queue', 'shutdown' etc)
|
|
* @param string $substate (optional, eg queue name 'omb' 'sms' etc)
|
|
*/
|
|
protected function logState($state, $substate='')
|
|
{
|
|
$this->monitor->logState($this->id, $state, $substate);
|
|
}
|
|
|
|
/**
|
|
* Send thread stats.
|
|
* Thread ID will be implicit; other owners can be listed as well
|
|
* for per-queue and per-site records.
|
|
*
|
|
* @param string $key counter name
|
|
* @param array $owners list of owner keys like 'queue:jabber' or 'site:stat01'
|
|
*/
|
|
public function stats($key, $owners=array())
|
|
{
|
|
$owners[] = "thread:" . $this->id;
|
|
$this->monitor->stats($key, $owners);
|
|
}
|
|
}
|
|
|