1025 lines
32 KiB
PHP
1025 lines
32 KiB
PHP
<?php
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namespace Friendica\Core;
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use Friendica\App;
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use Friendica\Core\System;
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use Friendica\Core\Config;
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use Friendica\Core\Worker;
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use Friendica\Database\DBM;
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use Friendica\Util\Lock;
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use dba;
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/**
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* @file src/Core/Worker.php
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*
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* @brief Contains the class for the worker background job processing
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*/
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/**
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* @brief Worker methods
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*/
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class Worker {
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private static $up_start;
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private static $db_duration;
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private static $last_update;
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private static $lock_duration;
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/**
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* @brief Processes the tasks that are in the workerqueue table
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*
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* @param boolean $run_cron Should the cron processes be executed?
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*/
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public static function processQueue($run_cron = true) {
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$a = get_app();
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self::$up_start = microtime(true);
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// At first check the maximum load. We shouldn't continue with a high load
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if ($a->maxload_reached()) {
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logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// We now start the process. This is done after the load check since this could increase the load.
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$a->start_process();
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// Kill stale processes every 5 minutes
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$last_cleanup = Config::get('system', 'poller_last_cleaned', 0);
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if (time() > ($last_cleanup + 300)) {
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Config::set('system', 'poller_last_cleaned', time());
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self::killStaleWorkers();
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}
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// Count active workers and compare them with a maximum value that depends on the load
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if (self::tooMuchWorkers()) {
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logger('Pre check: Active worker limit reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// Do we have too few memory?
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if ($a->min_memory_reached()) {
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logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// Possibly there are too much database connections
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if (self::maxConnectionsReached()) {
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logger('Pre check: maximum connections reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// Possibly there are too much database processes that block the system
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if ($a->max_processes_reached()) {
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logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// Now we start additional cron processes if we should do so
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if ($run_cron) {
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self::runCron();
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}
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$starttime = time();
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// We fetch the next queue entry that is about to be executed
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while ($r = self::workerProcess($passing_slow)) {
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// When we are processing jobs with a lower priority, we don't refetch new jobs
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// Otherwise fast jobs could wait behind slow ones and could be blocked.
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$refetched = $passing_slow;
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foreach ($r AS $entry) {
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// Assure that the priority is an integer value
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$entry['priority'] = (int)$entry['priority'];
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// The work will be done
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if (!self::execute($entry)) {
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logger('Process execution failed, quitting.', LOGGER_DEBUG);
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return;
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}
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// If possible we will fetch new jobs for this worker
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if (!$refetched && Lock::set('poller_worker_process', 0)) {
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$stamp = (float)microtime(true);
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$refetched = self::findWorkerProcesses($passing_slow);
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self::$db_duration += (microtime(true) - $stamp);
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Lock::remove('poller_worker_process');
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}
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}
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// To avoid the quitting of multiple pollers only one poller at a time will execute the check
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if (Lock::set('poller_worker', 0)) {
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$stamp = (float)microtime(true);
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// Count active workers and compare them with a maximum value that depends on the load
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if (self::tooMuchWorkers()) {
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logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
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return;
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}
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// Check free memory
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if ($a->min_memory_reached()) {
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logger('Memory limit reached, quitting.', LOGGER_DEBUG);
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return;
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}
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Lock::remove('poller_worker');
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self::$db_duration += (microtime(true) - $stamp);
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}
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// Quit the poller once every 5 minutes
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if (time() > ($starttime + 300)) {
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logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
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return;
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}
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}
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logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
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}
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/**
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* @brief Returns the number of non executed entries in the worker queue
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*
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* @return integer Number of non executed entries in the worker queue
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*/
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private static function totalEntries() {
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$s = dba::fetch_first("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= ? AND NOT `done`", NULL_DATE);
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if (DBM::is_result($s)) {
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return $s["total"];
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} else {
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return 0;
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}
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}
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/**
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* @brief Returns the highest priority in the worker queue that isn't executed
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*
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* @return integer Number of active poller processes
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*/
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private static function highestPriority() {
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$condition = array("`executed` <= ? AND NOT `done`", NULL_DATE);
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$s = dba::select('workerqueue', array('priority'), $condition, array('limit' => 1, 'order' => array('priority')));
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if (DBM::is_result($s)) {
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return $s["priority"];
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} else {
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return 0;
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}
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}
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/**
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* @brief Returns if a process with the given priority is running
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*
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* @param integer $priority The priority that should be checked
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*
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* @return integer Is there a process running with that priority?
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*/
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private static function processWithPriorityActive($priority) {
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$condition = array("`priority` <= ? AND `executed` > ? AND NOT `done`", $priority, NULL_DATE);
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return dba::exists('workerqueue', $condition);
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}
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/**
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* @brief Execute a worker entry
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*
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* @param array $queue Workerqueue entry
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*
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* @return boolean "true" if further processing should be stopped
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*/
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public static function execute($queue) {
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$a = get_app();
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$mypid = getmypid();
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// Quit when in maintenance
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if (Config::get('system', 'maintenance', true)) {
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logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
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return false;
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}
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// Constantly check the number of parallel database processes
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if ($a->max_processes_reached()) {
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logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
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return false;
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}
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// Constantly check the number of available database connections to let the frontend be accessible at any time
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if (self::maxConnectionsReached()) {
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logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
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return false;
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}
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$argv = json_decode($queue["parameter"]);
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// Check for existance and validity of the include file
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$include = $argv[0];
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if (method_exists(sprintf('Friendica\Worker\%s', $include), 'execute')) {
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// We constantly update the "executed" date every minute to avoid being killed too soon
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if (!isset(self::$last_update)) {
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self::$last_update = strtotime($queue["executed"]);
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}
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$age = (time() - self::$last_update) / 60;
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self::$last_update = time();
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if ($age > 1) {
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$stamp = (float)microtime(true);
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dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
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self::$db_duration += (microtime(true) - $stamp);
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}
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array_shift($argv);
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self::execFunction($queue, $include, $argv, true);
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$stamp = (float)microtime(true);
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if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
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Config::set('system', 'last_poller_execution', datetime_convert());
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}
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self::$db_duration = (microtime(true) - $stamp);
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return true;
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}
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// The script could be provided as full path or only with the function name
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if ($include == basename($include)) {
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$include = "include/".$include.".php";
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}
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if (!validate_include($include)) {
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logger("Include file ".$argv[0]." is not valid!");
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dba::delete('workerqueue', array('id' => $queue["id"]));
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return true;
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}
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require_once($include);
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$funcname = str_replace(".php", "", basename($argv[0]))."_run";
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if (function_exists($funcname)) {
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// We constantly update the "executed" date every minute to avoid being killed too soon
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if (!isset(self::$last_update)) {
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self::$last_update = strtotime($queue["executed"]);
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}
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$age = (time() - self::$last_update) / 60;
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self::$last_update = time();
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if ($age > 1) {
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$stamp = (float)microtime(true);
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dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
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self::$db_duration += (microtime(true) - $stamp);
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}
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self::execFunction($queue, $funcname, $argv, false);
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$stamp = (float)microtime(true);
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if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
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Config::set('system', 'last_poller_execution', datetime_convert());
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}
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self::$db_duration = (microtime(true) - $stamp);
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} else {
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logger("Function ".$funcname." does not exist");
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dba::delete('workerqueue', array('id' => $queue["id"]));
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}
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return true;
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}
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/**
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* @brief Execute a function from the queue
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*
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* @param array $queue Workerqueue entry
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* @param string $funcname name of the function
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* @param array $argv Array of values to be passed to the function
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*/
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private static function execFunction($queue, $funcname, $argv, $method_call) {
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$a = get_app();
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$mypid = getmypid();
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$argc = count($argv);
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$new_process_id = uniqid("wrk", true);
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logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
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$stamp = (float)microtime(true);
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// We use the callstack here to analyze the performance of executed worker entries.
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// For this reason the variables have to be initialized.
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if (Config::get("system", "profiler")) {
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$a->performance["start"] = microtime(true);
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$a->performance["database"] = 0;
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$a->performance["database_write"] = 0;
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$a->performance["network"] = 0;
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$a->performance["file"] = 0;
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$a->performance["rendering"] = 0;
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$a->performance["parser"] = 0;
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$a->performance["marktime"] = 0;
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$a->performance["markstart"] = microtime(true);
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$a->callstack = array();
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}
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// For better logging create a new process id for every worker call
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// But preserve the old one for the worker
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$old_process_id = $a->process_id;
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$a->process_id = $new_process_id;
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$a->queue = $queue;
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$up_duration = number_format(microtime(true) - self::$up_start, 3);
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// Reset global data to avoid interferences
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unset($_SESSION);
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if ($method_call) {
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call_user_func_array(sprintf('Friendica\Worker\%s::execute', $funcname), $argv);
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} else {
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$funcname($argv, $argc);
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}
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$a->process_id = $old_process_id;
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unset($a->queue);
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$duration = number_format(microtime(true) - $stamp, 3);
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self::$up_start = microtime(true);
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/* With these values we can analyze how effective the worker is.
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* The database and rest time should be low since this is the unproductive time.
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* The execution time is the productive time.
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* By changing parameters like the maximum number of workers we can check the effectivness.
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*/
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logger('DB: '.number_format(self::$db_duration, 2).
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' - Lock: '.number_format(self::$lock_duration, 2).
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' - Rest: '.number_format($up_duration - self::$db_duration - self::$lock_duration, 2).
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' - Execution: '.number_format($duration, 2), LOGGER_DEBUG);
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self::$lock_duration = 0;
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if ($duration > 3600) {
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logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
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} elseif ($duration > 600) {
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logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
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} elseif ($duration > 300) {
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logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
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} elseif ($duration > 120) {
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logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
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}
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logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds. Process PID: ".$new_process_id);
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// Write down the performance values into the log
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if (Config::get("system", "profiler")) {
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$duration = microtime(true)-$a->performance["start"];
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if (Config::get("rendertime", "callstack")) {
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if (isset($a->callstack["database"])) {
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$o = "\nDatabase Read:\n";
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foreach ($a->callstack["database"] AS $func => $time) {
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$time = round($time, 3);
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if ($time > 0) {
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$o .= $func.": ".$time."\n";
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}
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}
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}
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if (isset($a->callstack["database_write"])) {
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$o .= "\nDatabase Write:\n";
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foreach ($a->callstack["database_write"] AS $func => $time) {
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$time = round($time, 3);
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if ($time > 0) {
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$o .= $func.": ".$time."\n";
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}
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}
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}
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if (isset($a->callstack["network"])) {
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$o .= "\nNetwork:\n";
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foreach ($a->callstack["network"] AS $func => $time) {
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$time = round($time, 3);
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if ($time > 0) {
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$o .= $func.": ".$time."\n";
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}
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}
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}
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} else {
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$o = '';
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}
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logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
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number_format($a->performance["database"] - $a->performance["database_write"], 2),
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number_format($a->performance["database_write"], 2),
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number_format($a->performance["network"], 2),
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number_format($a->performance["file"], 2),
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number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
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number_format($duration, 2)),
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LOGGER_DEBUG);
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}
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$cooldown = Config::get("system", "worker_cooldown", 0);
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if ($cooldown > 0) {
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logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
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sleep($cooldown);
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}
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}
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/**
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* @brief Checks if the number of database connections has reached a critical limit.
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*
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* @return bool Are more than 3/4 of the maximum connections used?
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*/
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private static function maxConnectionsReached() {
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// Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
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$max = Config::get("system", "max_connections");
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// Fetch the percentage level where the poller will get active
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$maxlevel = Config::get("system", "max_connections_level", 75);
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if ($max == 0) {
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// the maximum number of possible user connections can be a system variable
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$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
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if (DBM::is_result($r)) {
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$max = $r["Value"];
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}
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// Or it can be granted. This overrides the system variable
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$r = dba::p('SHOW GRANTS');
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while ($grants = dba::fetch($r)) {
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$grant = array_pop($grants);
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if (stristr($grant, "GRANT USAGE ON")) {
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if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
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$max = $match[1];
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}
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}
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}
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dba::close($r);
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}
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// If $max is set we will use the processlist to determine the current number of connections
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// The processlist only shows entries of the current user
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if ($max != 0) {
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$r = dba::p('SHOW PROCESSLIST');
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$used = dba::num_rows($r);
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dba::close($r);
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logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
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$level = ($used / $max) * 100;
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if ($level >= $maxlevel) {
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logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
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return true;
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}
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}
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// We will now check for the system values.
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// This limit could be reached although the user limits are fine.
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$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
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if (!DBM::is_result($r)) {
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return false;
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}
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$max = intval($r["Value"]);
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if ($max == 0) {
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return false;
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}
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$r = dba::fetch_first("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
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if (!DBM::is_result($r)) {
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return false;
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}
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$used = intval($r["Value"]);
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if ($used == 0) {
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return false;
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}
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logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
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$level = $used / $max * 100;
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if ($level < $maxlevel) {
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return false;
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}
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logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
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return true;
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}
|
|
|
|
/**
|
|
* @brief fix the queue entry if the worker process died
|
|
*
|
|
*/
|
|
private static function killStaleWorkers() {
|
|
$entries = dba::select('workerqueue', array('id', 'pid', 'executed', 'priority', 'parameter'),
|
|
array('`executed` > ? AND NOT `done` AND `pid` != 0', NULL_DATE),
|
|
array('order' => array('priority', 'created')));
|
|
while ($entry = dba::fetch($entries)) {
|
|
if (!posix_kill($entry["pid"], 0)) {
|
|
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
|
|
array('id' => $entry["id"]));
|
|
} else {
|
|
// Kill long running processes
|
|
// Check if the priority is in a valid range
|
|
if (!in_array($entry["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
|
|
$entry["priority"] = PRIORITY_MEDIUM;
|
|
}
|
|
|
|
// Define the maximum durations
|
|
$max_duration_defaults = array(PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720);
|
|
$max_duration = $max_duration_defaults[$entry["priority"]];
|
|
|
|
$argv = json_decode($entry["parameter"]);
|
|
$argv[0] = basename($argv[0]);
|
|
|
|
// How long is the process already running?
|
|
$duration = (time() - strtotime($entry["executed"])) / 60;
|
|
if ($duration > $max_duration) {
|
|
logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
|
|
posix_kill($entry["pid"], SIGTERM);
|
|
|
|
// We killed the stale process.
|
|
// To avoid a blocking situation we reschedule the process at the beginning of the queue.
|
|
// Additionally we are lowering the priority. (But not PRIORITY_CRITICAL)
|
|
if ($entry["priority"] == PRIORITY_HIGH) {
|
|
$new_priority = PRIORITY_MEDIUM;
|
|
} elseif ($entry["priority"] == PRIORITY_MEDIUM) {
|
|
$new_priority = PRIORITY_LOW;
|
|
} elseif ($entry["priority"] != PRIORITY_CRITICAL) {
|
|
$new_priority = PRIORITY_NEGLIGIBLE;
|
|
}
|
|
dba::update('workerqueue',
|
|
array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => $new_priority, 'pid' => 0),
|
|
array('id' => $entry["id"]));
|
|
} else {
|
|
logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Checks if the number of active workers exceeds the given limits
|
|
*
|
|
* @return bool Are there too much workers running?
|
|
*/
|
|
public static function tooMuchWorkers() {
|
|
$queues = Config::get("system", "worker_queues", 4);
|
|
|
|
$maxqueues = $queues;
|
|
|
|
$active = self::activeWorkers();
|
|
|
|
// Decrease the number of workers at higher load
|
|
$load = current_load();
|
|
if ($load) {
|
|
$maxsysload = intval(Config::get("system", "maxloadavg", 50));
|
|
|
|
$maxworkers = $queues;
|
|
|
|
// Some magical mathemathics to reduce the workers
|
|
$exponent = 3;
|
|
$slope = $maxworkers / pow($maxsysload, $exponent);
|
|
$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
|
|
|
|
if (Config::get('system', 'worker_debug')) {
|
|
// Create a list of queue entries grouped by their priority
|
|
$listitem = array();
|
|
|
|
// Adding all processes with no workerqueue entry
|
|
$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
|
|
(SELECT id FROM `workerqueue`
|
|
WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)", getmypid());
|
|
if ($process = dba::fetch($processes)) {
|
|
$listitem[0] = "0:".$process["running"];
|
|
}
|
|
dba::close($processes);
|
|
|
|
// Now adding all processes with workerqueue entries
|
|
$entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
|
|
while ($entry = dba::fetch($entries)) {
|
|
$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
|
|
if ($process = dba::fetch($processes)) {
|
|
$listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
|
|
}
|
|
dba::close($processes);
|
|
}
|
|
dba::close($entries);
|
|
|
|
$intervals = array(1, 10, 60);
|
|
$jobs_per_minute = array();
|
|
foreach ($intervals AS $interval) {
|
|
$jobs = dba::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
|
|
if ($job = dba::fetch($jobs)) {
|
|
$jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
|
|
}
|
|
dba::close($jobs);
|
|
}
|
|
$processlist = ' - jpm: '.implode('/', $jobs_per_minute).' ('.implode(', ', $listitem).')';
|
|
}
|
|
|
|
$entries = self::totalEntries();
|
|
|
|
if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
|
|
$top_priority = self::highestPriority();
|
|
$high_running = self::processWithPriorityActive($top_priority);
|
|
|
|
if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
|
|
logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
|
|
$queues = $active + 1;
|
|
}
|
|
}
|
|
|
|
logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
|
|
|
|
// Are there fewer workers running as possible? Then fork a new one.
|
|
if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
|
|
logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
|
|
self::spawnWorker();
|
|
}
|
|
}
|
|
|
|
return $active >= $queues;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the number of active poller processes
|
|
*
|
|
* @return integer Number of active poller processes
|
|
*/
|
|
private static function activeWorkers() {
|
|
$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'Worker.php'");
|
|
|
|
return $workers["processes"];
|
|
}
|
|
|
|
/**
|
|
* @brief Check if we should pass some slow processes
|
|
*
|
|
* When the active processes of the highest priority are using more than 2/3
|
|
* of all processes, we let pass slower processes.
|
|
*
|
|
* @param string $highest_priority Returns the currently highest priority
|
|
* @return bool We let pass a slower process than $highest_priority
|
|
*/
|
|
private static function passingSlow(&$highest_priority) {
|
|
$highest_priority = 0;
|
|
|
|
$r = dba::p("SELECT `priority`
|
|
FROM `process`
|
|
INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`");
|
|
|
|
// No active processes at all? Fine
|
|
if (!DBM::is_result($r)) {
|
|
return false;
|
|
}
|
|
$priorities = array();
|
|
while ($line = dba::fetch($r)) {
|
|
$priorities[] = $line["priority"];
|
|
}
|
|
dba::close($r);
|
|
|
|
// Should not happen
|
|
if (count($priorities) == 0) {
|
|
return false;
|
|
}
|
|
$highest_priority = min($priorities);
|
|
|
|
// The highest process is already the slowest one?
|
|
// Then we quit
|
|
if ($highest_priority == PRIORITY_NEGLIGIBLE) {
|
|
return false;
|
|
}
|
|
$high = 0;
|
|
foreach ($priorities AS $priority) {
|
|
if ($priority == $highest_priority) {
|
|
++$high;
|
|
}
|
|
}
|
|
logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
|
|
$passing_slow = (($high/count($priorities)) > (2/3));
|
|
|
|
if ($passing_slow) {
|
|
logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
|
|
}
|
|
return $passing_slow;
|
|
}
|
|
|
|
/**
|
|
* @brief Find and claim the next worker process for us
|
|
*
|
|
* @param boolean $passing_slow Returns if we had passed low priority processes
|
|
* @return boolean Have we found something?
|
|
*/
|
|
private static function findWorkerProcesses(&$passing_slow) {
|
|
$mypid = getmypid();
|
|
|
|
// Check if we should pass some low priority process
|
|
$highest_priority = 0;
|
|
$found = false;
|
|
$passing_slow = false;
|
|
|
|
// The higher the number of parallel workers, the more we prefetch to prevent concurring access
|
|
// We decrease the limit with the number of entries left in the queue
|
|
$worker_queues = Config::get("system", "worker_queues", 4);
|
|
$queue_length = Config::get('system', 'worker_fetch_limit', 1);
|
|
$lower_job_limit = $worker_queues * $queue_length * 2;
|
|
$jobs = self::totalEntries();
|
|
|
|
// Now do some magic
|
|
$exponent = 2;
|
|
$slope = $queue_length / pow($lower_job_limit, $exponent);
|
|
$limit = min($queue_length, ceil($slope * pow($jobs, $exponent)));
|
|
|
|
logger('Total: '.$jobs.' - Maximum: '.$queue_length.' - jobs per queue: '.$limit, LOGGER_DEBUG);
|
|
|
|
if (self::passingSlow($highest_priority)) {
|
|
// Are there waiting processes with a higher priority than the currently highest?
|
|
$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND `priority` < ? AND NOT `done`", NULL_DATE, $highest_priority),
|
|
array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
|
|
|
|
while ($id = dba::fetch($result)) {
|
|
$ids[] = $id["id"];
|
|
}
|
|
dba::close($result);
|
|
|
|
$found = (count($ids) > 0);
|
|
|
|
if (!$found) {
|
|
// Give slower processes some processing time
|
|
$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND `priority` > ? AND NOT `done`", NULL_DATE, $highest_priority),
|
|
array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
|
|
|
|
while ($id = dba::fetch($result)) {
|
|
$ids[] = $id["id"];
|
|
}
|
|
dba::close($result);
|
|
|
|
$found = (count($ids) > 0);
|
|
$passing_slow = $found;
|
|
}
|
|
}
|
|
|
|
// If there is no result (or we shouldn't pass lower processes) we check without priority limit
|
|
if (!$found) {
|
|
$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND NOT `done`", NULL_DATE),
|
|
array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
|
|
|
|
while ($id = dba::fetch($result)) {
|
|
$ids[] = $id["id"];
|
|
}
|
|
dba::close($result);
|
|
|
|
$found = (count($ids) > 0);
|
|
}
|
|
|
|
if ($found) {
|
|
$condition = "`id` IN (".substr(str_repeat("?, ", count($ids)), 0, -2).") AND `pid` = 0 AND NOT `done`";
|
|
array_unshift($ids, $condition);
|
|
dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid), $ids);
|
|
}
|
|
|
|
return $found;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the next worker process
|
|
*
|
|
* @param boolean $passing_slow Returns if we had passed low priority processes
|
|
* @return string SQL statement
|
|
*/
|
|
public static function workerProcess(&$passing_slow) {
|
|
$stamp = (float)microtime(true);
|
|
|
|
// There can already be jobs for us in the queue.
|
|
$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
|
|
if (DBM::is_result($r)) {
|
|
self::$db_duration += (microtime(true) - $stamp);
|
|
return dba::inArray($r);
|
|
}
|
|
dba::close($r);
|
|
|
|
$stamp = (float)microtime(true);
|
|
if (!Lock::set('poller_worker_process')) {
|
|
return false;
|
|
}
|
|
self::$lock_duration = (microtime(true) - $stamp);
|
|
|
|
$stamp = (float)microtime(true);
|
|
$found = self::findWorkerProcesses($passing_slow);
|
|
self::$db_duration += (microtime(true) - $stamp);
|
|
|
|
Lock::remove('poller_worker_process');
|
|
|
|
if ($found) {
|
|
$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
|
|
return dba::inArray($r);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @brief Removes a workerqueue entry from the current process
|
|
*/
|
|
public static function unclaimProcess() {
|
|
$mypid = getmypid();
|
|
|
|
dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid, 'done' => false));
|
|
}
|
|
|
|
/**
|
|
* @brief Call the front end worker
|
|
*/
|
|
public static function callWorker() {
|
|
if (!Config::get("system", "frontend_worker")) {
|
|
return;
|
|
}
|
|
|
|
$url = System::baseUrl()."/worker";
|
|
fetch_url($url, false, $redirects, 1);
|
|
}
|
|
|
|
/**
|
|
* @brief Call the front end worker if there aren't any active
|
|
*/
|
|
public static function executeIfIdle() {
|
|
if (!Config::get("system", "frontend_worker")) {
|
|
return;
|
|
}
|
|
|
|
// Do we have "proc_open"? Then we can fork the poller
|
|
if (function_exists("proc_open")) {
|
|
// When was the last time that we called the worker?
|
|
// Less than one minute? Then we quit
|
|
if ((time() - Config::get("system", "worker_started")) < 60) {
|
|
return;
|
|
}
|
|
|
|
Config::set("system", "worker_started", time());
|
|
|
|
// Do we have enough running workers? Then we quit here.
|
|
if (self::tooMuchWorkers()) {
|
|
// Cleaning dead processes
|
|
self::killStaleWorkers();
|
|
get_app()->remove_inactive_processes();
|
|
|
|
return;
|
|
}
|
|
|
|
self::runCron();
|
|
|
|
logger('Call poller', LOGGER_DEBUG);
|
|
self::spawnWorker();
|
|
return;
|
|
}
|
|
|
|
// We cannot execute background processes.
|
|
// We now run the processes from the frontend.
|
|
// This won't work with long running processes.
|
|
self::runCron();
|
|
|
|
self::clearProcesses();
|
|
|
|
$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
|
|
|
|
if ($workers["processes"] == 0) {
|
|
self::callWorker();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Removes long running worker processes
|
|
*/
|
|
public static function clearProcesses() {
|
|
$timeout = Config::get("system", "frontend_worker_timeout", 10);
|
|
|
|
/// @todo We should clean up the corresponding workerqueue entries as well
|
|
$condition = array("`created` < ? AND `command` = 'worker.php'",
|
|
datetime_convert('UTC','UTC',"now - ".$timeout." minutes"));
|
|
dba::delete('process', $condition);
|
|
}
|
|
|
|
/**
|
|
* @brief Runs the cron processes
|
|
*/
|
|
private static function runCron() {
|
|
logger('Add cron entries', LOGGER_DEBUG);
|
|
|
|
// Check for spooled items
|
|
self::add(PRIORITY_HIGH, "SpoolPost");
|
|
|
|
// Run the cron job that calls all other jobs
|
|
self::add(PRIORITY_MEDIUM, "Cron");
|
|
|
|
// Run the cronhooks job separately from cron for being able to use a different timing
|
|
self::add(PRIORITY_MEDIUM, "CronHooks");
|
|
|
|
// Cleaning dead processes
|
|
self::killStaleWorkers();
|
|
}
|
|
|
|
public static function spawnWorker() {
|
|
$args = array("include/poller.php", "no_cron");
|
|
get_app()->proc_run($args);
|
|
}
|
|
|
|
/**
|
|
* @brief Adds tasks to the worker queue
|
|
*
|
|
* @param (integer|array) priority or parameter array, strings are deprecated and are ignored
|
|
*
|
|
* next args are passed as $cmd command line
|
|
* or: Worker::add(PRIORITY_HIGH, "Notifier", "drop", $drop_id);
|
|
* or: Worker::add(array('priority' => PRIORITY_HIGH, 'dont_fork' => true), "CreateShadowEntry", $post_id);
|
|
*
|
|
* @note $cmd and string args are surrounded with ""
|
|
*
|
|
* @hooks 'proc_run'
|
|
* array $arr
|
|
*
|
|
* @return boolean "false" if proc_run couldn't be executed
|
|
*/
|
|
public static function add($cmd) {
|
|
$proc_args = func_get_args();
|
|
|
|
$args = array();
|
|
if (!count($proc_args)) {
|
|
return false;
|
|
}
|
|
|
|
// Preserve the first parameter
|
|
// It could contain a command, the priority or an parameter array
|
|
// If we use the parameter array we have to protect it from the following function
|
|
$run_parameter = array_shift($proc_args);
|
|
|
|
// expand any arrays
|
|
foreach ($proc_args as $arg) {
|
|
if (is_array($arg)) {
|
|
foreach ($arg as $n) {
|
|
$args[] = $n;
|
|
}
|
|
} else {
|
|
$args[] = $arg;
|
|
}
|
|
}
|
|
|
|
// Now we add the run parameters back to the array
|
|
array_unshift($args, $run_parameter);
|
|
|
|
$arr = array('args' => $args, 'run_cmd' => true);
|
|
|
|
call_hooks("proc_run", $arr);
|
|
if (!$arr['run_cmd'] || !count($args)) {
|
|
return true;
|
|
}
|
|
|
|
$priority = PRIORITY_MEDIUM;
|
|
$dont_fork = Config::get("system", "worker_dont_fork");
|
|
$created = datetime_convert();
|
|
|
|
if (is_int($run_parameter)) {
|
|
$priority = $run_parameter;
|
|
} elseif (is_array($run_parameter)) {
|
|
if (isset($run_parameter['priority'])) {
|
|
$priority = $run_parameter['priority'];
|
|
}
|
|
if (isset($run_parameter['created'])) {
|
|
$created = $run_parameter['created'];
|
|
}
|
|
if (isset($run_parameter['dont_fork'])) {
|
|
$dont_fork = $run_parameter['dont_fork'];
|
|
}
|
|
}
|
|
|
|
$argv = $args;
|
|
array_shift($argv);
|
|
|
|
$parameters = json_encode($argv);
|
|
$found = dba::exists('workerqueue', array('parameter' => $parameters, 'done' => false));
|
|
|
|
// Quit if there was a database error - a precaution for the update process to 3.5.3
|
|
if (dba::errorNo() != 0) {
|
|
return false;
|
|
}
|
|
|
|
if (!$found) {
|
|
dba::insert('workerqueue', array('parameter' => $parameters, 'created' => $created, 'priority' => $priority));
|
|
}
|
|
|
|
// Should we quit and wait for the poller to be called as a cronjob?
|
|
if ($dont_fork) {
|
|
return true;
|
|
}
|
|
|
|
// If there is a lock then we don't have to check for too much worker
|
|
if (!Lock::set('poller_worker', 0)) {
|
|
return true;
|
|
}
|
|
|
|
// If there are already enough workers running, don't fork another one
|
|
$quit = self::tooMuchWorkers();
|
|
Lock::remove('poller_worker');
|
|
|
|
if ($quit) {
|
|
return true;
|
|
}
|
|
|
|
// Now call the poller to execute the jobs that we just added to the queue
|
|
self::spawnWorker();
|
|
|
|
return true;
|
|
}
|
|
}
|