370 lines
11 KiB
PHP
370 lines
11 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* I/O manager to wrap around socket-reading and polling queue & connection 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 Brion Vibber <brion@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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abstract class IoMaster
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{
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public $id;
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protected $multiSite = false;
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protected $managers = array();
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protected $singletons = array();
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protected $pollTimeouts = array();
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protected $lastPoll = array();
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public $shutdown = false; // Did we do a graceful shutdown?
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public $respawn = true; // Should we respawn after shutdown?
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/**
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* @param string $id process ID to use in logging/monitoring
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*/
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public function __construct($id)
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{
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$this->id = $id;
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$this->monitor = new QueueMonitor();
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}
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public function init($multiSite=null)
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{
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if ($multiSite !== null) {
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$this->multiSite = $multiSite;
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}
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if ($this->multiSite) {
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$this->sites = StatusNet::findAllSites();
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} else {
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$this->sites = array(StatusNet::currentSite());
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}
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if (empty($this->sites)) {
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throw new Exception("Empty status_network table, cannot init");
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}
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foreach ($this->sites as $site) {
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StatusNet::switchSite($site);
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$this->initManagers();
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}
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}
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/**
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* Initialize IoManagers for the currently configured site
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* which are appropriate to this instance.
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*
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* Pass class names into $this->instantiate()
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*/
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abstract function initManagers();
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/**
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* Instantiate an i/o manager class for the current site.
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* If a multi-site capable handler is already present,
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* we don't need to build a new one.
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*
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* @param mixed $manager class name (to run $class::get()) or object
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*/
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protected function instantiate($manager)
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{
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if (is_string($manager)) {
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$manager = call_user_func(array($class, 'get'));
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}
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$caps = $manager->multiSite();
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if ($caps == IoManager::SINGLE_ONLY) {
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if ($this->multiSite) {
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throw new Exception("$class can't run with --all; aborting.");
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}
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} else if ($caps == IoManager::INSTANCE_PER_PROCESS) {
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$manager->addSite();
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}
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if (!in_array($manager, $this->managers, true)) {
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// Only need to save singletons once
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$this->managers[] = $manager;
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}
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}
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/**
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* Basic run loop...
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*
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* Initialize all io managers, then sit around waiting for input.
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* Between events or timeouts, pass control back to idle() method
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* to allow for any additional background processing.
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*/
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function service()
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{
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$this->logState('init');
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$this->start();
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$this->checkMemory(false);
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while (!$this->shutdown) {
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$timeouts = array_values($this->pollTimeouts);
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$timeouts[] = 60; // default max timeout
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// Wait for something on one of our sockets
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$sockets = array();
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$managers = array();
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foreach ($this->managers as $manager) {
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foreach ($manager->getSockets() as $socket) {
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$sockets[] = $socket;
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$managers[] = $manager;
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}
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$timeouts[] = intval($manager->timeout());
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}
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$timeout = min($timeouts);
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if ($sockets) {
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$read = $sockets;
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$write = array();
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$except = array();
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$this->logState('listening');
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common_log(LOG_DEBUG, "Waiting up to $timeout seconds for socket data...");
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$ready = stream_select($read, $write, $except, $timeout, 0);
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if ($ready === false) {
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common_log(LOG_ERR, "Error selecting on sockets");
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} else if ($ready > 0) {
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foreach ($read as $socket) {
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$index = array_search($socket, $sockets, true);
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if ($index !== false) {
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$this->logState('queue');
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$managers[$index]->handleInput($socket);
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} else {
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common_log(LOG_ERR, "Saw input on a socket we didn't listen to");
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}
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}
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}
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}
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if ($timeout > 0 && empty($sockets)) {
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// If we had no listeners, sleep until the pollers' next requested wakeup.
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common_log(LOG_DEBUG, "Sleeping $timeout seconds until next poll cycle...");
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$this->logState('sleep');
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sleep($timeout);
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}
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$this->logState('poll');
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$this->poll();
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$this->logState('idle');
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$this->idle();
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$this->checkMemory();
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}
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$this->logState('shutdown');
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$this->finish();
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}
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/**
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* Check runtime memory usage, possibly triggering a graceful shutdown
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* and thread respawn if we've crossed the soft limit.
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*
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* @param boolean $respawn if false we'll shut down instead of respawning
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*/
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protected function checkMemory($respawn=true)
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{
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$memoryLimit = $this->softMemoryLimit();
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if ($memoryLimit > 0) {
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$usage = memory_get_usage();
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if ($usage > $memoryLimit) {
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common_log(LOG_INFO, "Queue thread hit soft memory limit ($usage > $memoryLimit); gracefully restarting.");
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if ($respawn) {
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$this->requestRestart();
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} else {
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$this->requestShutdown();
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}
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} else if (common_config('queue', 'debug_memory')) {
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$fmt = number_format($usage);
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common_log(LOG_DEBUG, "Memory usage $fmt");
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}
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}
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}
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/**
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* Return fully-parsed soft memory limit in bytes.
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* @return intval 0 or -1 if not set
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*/
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function softMemoryLimit()
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{
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$softLimit = trim(common_config('queue', 'softlimit'));
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if (substr($softLimit, -1) == '%') {
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$limit = $this->parseMemoryLimit(ini_get('memory_limit'));
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if ($limit > 0) {
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return intval(substr($softLimit, 0, -1) * $limit / 100);
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} else {
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return -1;
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}
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} else {
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return $this->parseMemoryLimit($softLimit);
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}
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return $softLimit;
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}
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/**
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* Interpret PHP shorthand for memory_limit and friends.
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* Why don't they just expose the actual numeric value? :P
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* @param string $mem
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* @return int
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*/
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public function parseMemoryLimit($mem)
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{
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// http://www.php.net/manual/en/faq.using.php#faq.using.shorthandbytes
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$mem = strtolower(trim($mem));
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$size = array('k' => 1024,
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'm' => 1024*1024,
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'g' => 1024*1024*1024);
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if (empty($mem)) {
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return 0;
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} else if (is_numeric($mem)) {
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return intval($mem);
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} else {
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$mult = substr($mem, -1);
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if (isset($size[$mult])) {
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return substr($mem, 0, -1) * $size[$mult];
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} else {
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return intval($mem);
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}
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}
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}
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function start()
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{
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foreach ($this->managers as $index => $manager) {
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$manager->start($this);
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// @fixme error check
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if ($manager->pollInterval()) {
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// We'll want to check for input on the first pass
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$this->pollTimeouts[$index] = 0;
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$this->lastPoll[$index] = 0;
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}
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}
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}
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function finish()
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{
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foreach ($this->managers as $manager) {
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$manager->finish();
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// @fixme error check
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}
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}
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/**
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* Called during the idle portion of the runloop to see which handlers
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*/
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function poll()
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{
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foreach ($this->managers as $index => $manager) {
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$interval = $manager->pollInterval();
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if ($interval <= 0) {
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// Not a polling manager.
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continue;
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}
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if (isset($this->pollTimeouts[$index])) {
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$timeout = $this->pollTimeouts[$index];
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if (time() - $this->lastPoll[$index] < $timeout) {
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// Not time to poll yet.
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continue;
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}
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} else {
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$timeout = 0;
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}
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$hit = $manager->poll();
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$this->lastPoll[$index] = time();
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if ($hit) {
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// Do the next poll quickly, there may be more input!
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$this->pollTimeouts[$index] = 0;
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} else {
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// Empty queue. Exponential backoff up to the maximum poll interval.
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if ($timeout > 0) {
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$timeout = min($timeout * 2, $interval);
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} else {
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$timeout = 1;
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}
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$this->pollTimeouts[$index] = $timeout;
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}
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}
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}
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/**
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* Called after each handled item or empty polling cycle.
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* This is a good time to e.g. service your XMPP connection.
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*/
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function idle()
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{
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foreach ($this->managers as $manager) {
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$manager->idle();
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}
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}
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/**
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* Send thread state update to the monitoring server, if configured.
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*
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* @param string $state ('init', 'queue', 'shutdown' etc)
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* @param string $substate (optional, eg queue name 'omb' 'sms' etc)
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*/
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protected function logState($state, $substate='')
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{
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$this->monitor->logState($this->id, $state, $substate);
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}
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/**
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* Send thread stats.
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* Thread ID will be implicit; other owners can be listed as well
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* for per-queue and per-site records.
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*
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* @param string $key counter name
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* @param array $owners list of owner keys like 'queue:xmpp' or 'site:stat01'
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*/
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public function stats($key, $owners=array())
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{
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$owners[] = "thread:" . $this->id;
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$this->monitor->stats($key, $owners);
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}
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/**
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* For IoManagers to request a graceful shutdown at end of event loop.
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*/
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public function requestShutdown()
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{
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$this->shutdown = true;
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$this->respawn = false;
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}
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/**
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* For IoManagers to request a graceful restart at end of event loop.
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*/
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public function requestRestart()
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{
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$this->shutdown = true;
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$this->respawn = true;
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}
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}
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