3 * @copyright Copyright (C) 2010-2021, the Friendica project
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Core;
24 use Friendica\App\Mode;
26 use Friendica\Core\Worker\Entity\Process;
27 use Friendica\Database\DBA;
29 use Friendica\Util\DateTimeFormat;
32 * Contains the class for the worker background job processing
36 const STATE_STARTUP = 1; // Worker is in startup. This takes most time.
37 const STATE_LONG_LOOP = 2; // Worker is processing the whole - long - loop.
38 const STATE_REFETCH = 3; // Worker had refetched jobs in the execution loop.
39 const STATE_SHORT_LOOP = 4; // Worker is processing preassigned jobs, thus saving much time.
41 const FAST_COMMANDS = ['APDelivery', 'Delivery'];
43 const LOCK_PROCESS = 'worker_process';
44 const LOCK_WORKER = 'worker';
46 private static $up_start;
47 private static $db_duration = 0;
48 private static $db_duration_count = 0;
49 private static $db_duration_write = 0;
50 private static $db_duration_stat = 0;
51 private static $lock_duration = 0;
52 private static $last_update;
53 private static $state;
54 private static $daemon_mode = null;
56 private static $process;
59 * Processes the tasks that are in the workerqueue table
61 * @param boolean $run_cron Should the cron processes be executed?
62 * @param Process $process The current running process
64 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
66 public static function processQueue($run_cron, Process $process)
68 self::$up_start = microtime(true);
70 // At first check the maximum load. We shouldn't continue with a high load
71 if (DI::system()->isMaxLoadReached()) {
72 Logger::notice('Pre check: maximum load reached, quitting.');
76 // We now start the process. This is done after the load check since this could increase the load.
77 self::$process = $process;
79 // Kill stale processes every 5 minutes
80 $last_cleanup = DI::config()->get('system', 'worker_last_cleaned', 0);
81 if (time() > ($last_cleanup + 300)) {
82 DI::config()->set('system', 'worker_last_cleaned', time());
83 self::killStaleWorkers();
86 // Check if the system is ready
87 if (!self::isReady()) {
91 // Now we start additional cron processes if we should do so
96 $last_check = $starttime = time();
97 self::$state = self::STATE_STARTUP;
99 // We fetch the next queue entry that is about to be executed
100 while ($r = self::workerProcess()) {
101 if (self::IPCJobsExists(getmypid())) {
102 self::IPCDeleteJobState(getmypid());
105 // Don't refetch when a worker fetches tasks for multiple workers
106 $refetched = DI::config()->get('system', 'worker_multiple_fetch');
107 foreach ($r as $entry) {
108 // Assure that the priority is an integer value
109 $entry['priority'] = (int)$entry['priority'];
111 // The work will be done
112 if (!self::execute($entry)) {
113 Logger::notice('Process execution failed, quitting.');
117 // Trying to fetch new processes - but only once when successful
118 if (!$refetched && DI::lock()->acquire(self::LOCK_PROCESS, 0)) {
119 self::findWorkerProcesses();
120 DI::lock()->release(self::LOCK_PROCESS);
121 self::$state = self::STATE_REFETCH;
124 self::$state = self::STATE_SHORT_LOOP;
128 // To avoid the quitting of multiple workers only one worker at a time will execute the check
129 if ((time() > $last_check + 5) && !self::getWaitingJobForPID()) {
130 self::$state = self::STATE_LONG_LOOP;
132 if (DI::lock()->acquire(self::LOCK_WORKER, 0)) {
133 // Count active workers and compare them with a maximum value that depends on the load
134 if (self::tooMuchWorkers()) {
135 Logger::notice('Active worker limit reached, quitting.');
136 DI::lock()->release(self::LOCK_WORKER);
141 if (DI::system()->isMinMemoryReached()) {
142 Logger::warning('Memory limit reached, quitting.');
143 DI::lock()->release(self::LOCK_WORKER);
146 DI::lock()->release(self::LOCK_WORKER);
148 $last_check = time();
151 // Quit the worker once every cron interval
152 if (time() > ($starttime + (DI::config()->get('system', 'cron_interval') * 60))) {
153 Logger::info('Process lifetime reached, respawning.');
154 self::unclaimProcess($process);
155 if (self::isDaemonMode()) {
156 self::IPCSetJobState(true);
164 // Cleaning up. Possibly not needed, but it doesn't harm anything.
165 if (self::isDaemonMode()) {
166 self::IPCSetJobState(false);
168 Logger::info("Couldn't select a workerqueue entry, quitting process", ['pid' => getmypid()]);
172 * Checks if the system is ready.
174 * Several system parameters like memory, connections and processes are checked.
178 public static function isReady()
180 // Count active workers and compare them with a maximum value that depends on the load
181 if (self::tooMuchWorkers()) {
182 Logger::notice('Active worker limit reached, quitting.');
186 // Do we have too few memory?
187 if (DI::system()->isMinMemoryReached()) {
188 Logger::warning('Memory limit reached, quitting.');
192 // Possibly there are too much database connections
193 if (self::maxConnectionsReached()) {
194 Logger::warning('Maximum connections reached, quitting.');
198 // Possibly there are too much database processes that block the system
199 if (DI::system()->isMaxProcessesReached()) {
200 Logger::warning('Maximum processes reached, quitting.');
208 * Check if non executed tasks do exist in the worker queue
210 * @return boolean Returns "true" if tasks are existing
213 public static function entriesExists()
215 $stamp = (float)microtime(true);
216 $exists = DBA::exists('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` < ?", DateTimeFormat::utcNow()]);
217 self::$db_duration += (microtime(true) - $stamp);
222 * Returns the number of deferred entries in the worker queue
224 * @return integer Number of deferred entries in the worker queue
227 private static function deferredEntries()
229 $stamp = (float)microtime(true);
230 $count = DBA::count('workerqueue', ["NOT `done` AND `pid` = 0 AND `retrial` > ?", 0]);
231 self::$db_duration += (microtime(true) - $stamp);
232 self::$db_duration_count += (microtime(true) - $stamp);
237 * Returns the number of non executed entries in the worker queue
239 * @return integer Number of non executed entries in the worker queue
242 private static function totalEntries()
244 $stamp = (float)microtime(true);
245 $count = DBA::count('workerqueue', ['done' => false, 'pid' => 0]);
246 self::$db_duration += (microtime(true) - $stamp);
247 self::$db_duration_count += (microtime(true) - $stamp);
252 * Returns the highest priority in the worker queue that isn't executed
254 * @return integer Number of active worker processes
257 private static function highestPriority()
259 $stamp = (float)microtime(true);
260 $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
261 $workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
262 self::$db_duration += (microtime(true) - $stamp);
263 if (DBA::isResult($workerqueue)) {
264 return $workerqueue["priority"];
271 * Returns if a process with the given priority is running
273 * @param integer $priority The priority that should be checked
275 * @return integer Is there a process running with that priority?
278 private static function processWithPriorityActive($priority)
280 $condition = ["`priority` <= ? AND `pid` != 0 AND NOT `done`", $priority];
281 return DBA::exists('workerqueue', $condition);
285 * Checks if the given file is valid to be included
290 private static function validateInclude(&$file)
294 $file = realpath($file);
296 if (strpos($file, getcwd()) !== 0) {
300 $file = str_replace(getcwd() . "/", "", $file, $count);
305 if ($orig_file !== $file) {
310 if (strpos($file, "include/") === 0) {
314 if (strpos($file, "addon/") === 0) {
318 // Simply return flag
323 * Execute a worker entry
325 * @param array $queue Workerqueue entry
327 * @return boolean "true" if further processing should be stopped
328 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
330 public static function execute($queue)
334 // Quit when in maintenance
335 if (DI::config()->get('system', 'maintenance', false, true)) {
336 Logger::notice("Maintenance mode - quit process", ['pid' => $mypid]);
340 // Constantly check the number of parallel database processes
341 if (DI::system()->isMaxProcessesReached()) {
342 Logger::warning("Max processes reached for process", ['pid' => $mypid]);
346 // Constantly check the number of available database connections to let the frontend be accessible at any time
347 if (self::maxConnectionsReached()) {
348 Logger::warning("Max connection reached for process", ['pid' => $mypid]);
352 $argv = json_decode($queue['parameter'], true);
353 if (!is_array($argv)) {
357 if (!empty($queue['command'])) {
358 array_unshift($argv, $queue['command']);
362 Logger::warning('Parameter is empty', ['queue' => $queue]);
366 // Check for existance and validity of the include file
369 if (method_exists(sprintf('Friendica\Worker\%s', $include), 'execute')) {
370 // We constantly update the "executed" date every minute to avoid being killed too soon
371 if (!isset(self::$last_update)) {
372 self::$last_update = strtotime($queue["executed"]);
375 $age = (time() - self::$last_update) / 60;
376 self::$last_update = time();
379 $stamp = (float)microtime(true);
380 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
381 self::$db_duration += (microtime(true) - $stamp);
382 self::$db_duration_write += (microtime(true) - $stamp);
387 self::execFunction($queue, $include, $argv, true);
389 $stamp = (float)microtime(true);
390 $condition = ["`id` = ? AND `next_try` < ?", $queue['id'], DateTimeFormat::utcNow()];
391 if (DBA::update('workerqueue', ['done' => true], $condition)) {
392 DI::config()->set('system', 'last_worker_execution', DateTimeFormat::utcNow());
394 self::$db_duration = (microtime(true) - $stamp);
395 self::$db_duration_write += (microtime(true) - $stamp);
400 // The script could be provided as full path or only with the function name
401 if ($include == basename($include)) {
402 $include = "include/".$include.".php";
405 if (!self::validateInclude($include)) {
406 Logger::warning("Include file is not valid", ['file' => $argv[0]]);
407 $stamp = (float)microtime(true);
408 DBA::delete('workerqueue', ['id' => $queue["id"]]);
409 self::$db_duration = (microtime(true) - $stamp);
410 self::$db_duration_write += (microtime(true) - $stamp);
414 require_once $include;
416 $funcname = str_replace(".php", "", basename($argv[0]))."_run";
418 if (function_exists($funcname)) {
419 // We constantly update the "executed" date every minute to avoid being killed too soon
420 if (!isset(self::$last_update)) {
421 self::$last_update = strtotime($queue["executed"]);
424 $age = (time() - self::$last_update) / 60;
425 self::$last_update = time();
428 $stamp = (float)microtime(true);
429 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
430 self::$db_duration += (microtime(true) - $stamp);
431 self::$db_duration_write += (microtime(true) - $stamp);
434 self::execFunction($queue, $funcname, $argv, false);
436 $stamp = (float)microtime(true);
437 if (DBA::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
438 DI::config()->set('system', 'last_worker_execution', DateTimeFormat::utcNow());
440 self::$db_duration = (microtime(true) - $stamp);
441 self::$db_duration_write += (microtime(true) - $stamp);
443 Logger::warning("Function does not exist", ['function' => $funcname]);
444 $stamp = (float)microtime(true);
445 DBA::delete('workerqueue', ['id' => $queue["id"]]);
446 self::$db_duration = (microtime(true) - $stamp);
447 self::$db_duration_write += (microtime(true) - $stamp);
454 * Execute a function from the queue
456 * @param array $queue Workerqueue entry
457 * @param string $funcname name of the function
458 * @param array $argv Array of values to be passed to the function
459 * @param boolean $method_call boolean
461 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
463 private static function execFunction($queue, $funcname, $argv, $method_call)
467 $cooldown = DI::config()->get("system", "worker_cooldown", 0);
469 Logger::info('Pre execution cooldown.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'cooldown' => $cooldown]);
473 Logger::enableWorker($funcname);
475 Logger::info("Process start.", ['priority' => $queue["priority"], 'id' => $queue["id"]]);
477 $stamp = (float)microtime(true);
479 // We use the callstack here to analyze the performance of executed worker entries.
480 // For this reason the variables have to be initialized.
481 DI::profiler()->reset();
483 if (!in_array($queue['priority'], PRIORITIES)) {
484 Logger::warning('Invalid priority', ['queue' => $queue, 'callstack' => System::callstack(20)]);
485 $queue['priority'] = PRIORITY_MEDIUM;
488 $a->setQueue($queue);
490 $up_duration = microtime(true) - self::$up_start;
492 // Reset global data to avoid interferences
495 // Set the workerLogger as new default logger
497 call_user_func_array(sprintf('Friendica\Worker\%s::execute', $funcname), $argv);
499 $funcname($argv, count($argv));
502 Logger::disableWorker();
506 $duration = (microtime(true) - $stamp);
508 /* With these values we can analyze how effective the worker is.
509 * The database and rest time should be low since this is the unproductive time.
510 * The execution time is the productive time.
511 * By changing parameters like the maximum number of workers we can check the effectivness.
513 $dbtotal = round(self::$db_duration, 2);
514 $dbread = round(self::$db_duration - (self::$db_duration_count + self::$db_duration_write + self::$db_duration_stat), 2);
515 $dbcount = round(self::$db_duration_count, 2);
516 $dbstat = round(self::$db_duration_stat, 2);
517 $dbwrite = round(self::$db_duration_write, 2);
518 $dblock = round(self::$lock_duration, 2);
519 $rest = round(max(0, $up_duration - (self::$db_duration + self::$lock_duration)), 2);
520 $exec = round($duration, 2);
522 Logger::info('Performance:', ['state' => self::$state, 'count' => $dbcount, 'stat' => $dbstat, 'write' => $dbwrite, 'lock' => $dblock, 'total' => $dbtotal, 'rest' => $rest, 'exec' => $exec]);
524 self::$up_start = microtime(true);
525 self::$db_duration = 0;
526 self::$db_duration_count = 0;
527 self::$db_duration_stat = 0;
528 self::$db_duration_write = 0;
529 self::$lock_duration = 0;
531 if ($duration > 3600) {
532 Logger::info('Longer than 1 hour.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' => round($duration/60, 3)]);
533 } elseif ($duration > 600) {
534 Logger::info('Longer than 10 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' => round($duration/60, 3)]);
535 } elseif ($duration > 300) {
536 Logger::info('Longer than 5 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' => round($duration/60, 3)]);
537 } elseif ($duration > 120) {
538 Logger::info('Longer than 2 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' => round($duration/60, 3)]);
541 Logger::info('Process done.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' => round($duration, 3)]);
543 DI::profiler()->saveLog(DI::logger(), "ID " . $queue["id"] . ": " . $funcname);
546 Logger::info('Post execution cooldown.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'cooldown' => $cooldown]);
552 * Checks if the number of database connections has reached a critical limit.
554 * @return bool Are more than 3/4 of the maximum connections used?
555 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
557 private static function maxConnectionsReached()
559 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
560 $max = DI::config()->get("system", "max_connections");
562 // Fetch the percentage level where the worker will get active
563 $maxlevel = DI::config()->get("system", "max_connections_level", 75);
566 // the maximum number of possible user connections can be a system variable
567 $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
568 if (DBA::isResult($r)) {
571 // Or it can be granted. This overrides the system variable
572 $stamp = (float)microtime(true);
573 $r = DBA::p('SHOW GRANTS');
574 self::$db_duration += (microtime(true) - $stamp);
575 while ($grants = DBA::fetch($r)) {
576 $grant = array_pop($grants);
577 if (stristr($grant, "GRANT USAGE ON")) {
578 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
586 // If $max is set we will use the processlist to determine the current number of connections
587 // The processlist only shows entries of the current user
589 $stamp = (float)microtime(true);
590 $r = DBA::p('SHOW PROCESSLIST');
591 self::$db_duration += (microtime(true) - $stamp);
592 $used = DBA::numRows($r);
595 Logger::info("Connection usage (user values)", ['usage' => $used, 'max' => $max]);
597 $level = ($used / $max) * 100;
599 if ($level >= $maxlevel) {
600 Logger::warning("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
605 // We will now check for the system values.
606 // This limit could be reached although the user limits are fine.
607 $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
608 if (!DBA::isResult($r)) {
611 $max = intval($r["Value"]);
615 $r = DBA::fetchFirst("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
616 if (!DBA::isResult($r)) {
619 $used = intval($r["Value"]);
623 Logger::info("Connection usage (system values)", ['used' => $used, 'max' => $max]);
625 $level = $used / $max * 100;
627 if ($level < $maxlevel) {
630 Logger::warning("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
635 * fix the queue entry if the worker process died
640 private static function killStaleWorkers()
642 $stamp = (float)microtime(true);
643 $entries = DBA::select(
645 ['id', 'pid', 'executed', 'priority', 'command', 'parameter'],
646 ['NOT `done` AND `pid` != 0'],
647 ['order' => ['priority', 'retrial', 'created']]
649 self::$db_duration += (microtime(true) - $stamp);
651 while ($entry = DBA::fetch($entries)) {
652 if (!posix_kill($entry["pid"], 0)) {
653 $stamp = (float)microtime(true);
656 ['executed' => DBA::NULL_DATETIME, 'pid' => 0],
657 ['id' => $entry["id"]]
659 self::$db_duration += (microtime(true) - $stamp);
660 self::$db_duration_write += (microtime(true) - $stamp);
662 // Kill long running processes
663 // Check if the priority is in a valid range
664 if (!in_array($entry["priority"], [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE])) {
665 $entry["priority"] = PRIORITY_MEDIUM;
668 // Define the maximum durations
669 $max_duration_defaults = [PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720];
670 $max_duration = $max_duration_defaults[$entry["priority"]];
672 $argv = json_decode($entry['parameter'], true);
673 if (!empty($entry['command'])) {
674 $command = $entry['command'];
675 } elseif (!empty($argv)) {
676 $command = array_shift($argv);
681 $command = basename($command);
683 // How long is the process already running?
684 $duration = (time() - strtotime($entry["executed"])) / 60;
685 if ($duration > $max_duration) {
686 Logger::notice('Worker process took too much time - killed', ['duration' => number_format($duration, 3), 'max' => $max_duration, 'id' => $entry["id"], 'pid' => $entry["pid"], 'command' => $command]);
687 posix_kill($entry["pid"], SIGTERM);
689 // We killed the stale process.
690 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
691 // Additionally we are lowering the priority. (But not PRIORITY_CRITICAL)
692 $new_priority = $entry["priority"];
693 if ($entry["priority"] == PRIORITY_HIGH) {
694 $new_priority = PRIORITY_MEDIUM;
695 } elseif ($entry["priority"] == PRIORITY_MEDIUM) {
696 $new_priority = PRIORITY_LOW;
697 } elseif ($entry["priority"] != PRIORITY_CRITICAL) {
698 $new_priority = PRIORITY_NEGLIGIBLE;
700 $stamp = (float)microtime(true);
703 ['executed' => DBA::NULL_DATETIME, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
704 ['id' => $entry["id"]]
706 self::$db_duration += (microtime(true) - $stamp);
707 self::$db_duration_write += (microtime(true) - $stamp);
709 Logger::info('Process runtime is okay', ['duration' => number_format($duration, 3), 'max' => $max_duration, 'id' => $entry["id"], 'pid' => $entry["pid"], 'command' => $command]);
713 DBA::close($entries);
717 * Checks if the number of active workers exceeds the given limits
719 * @return bool Are there too much workers running?
720 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
722 private static function tooMuchWorkers()
724 $queues = DI::config()->get("system", "worker_queues", 10);
726 $maxqueues = $queues;
728 $active = self::activeWorkers();
730 // Decrease the number of workers at higher load
731 $load = System::currentLoad();
733 $maxsysload = intval(DI::config()->get("system", "maxloadavg", 20));
735 /* Default exponent 3 causes queues to rapidly decrease as load increases.
736 * If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
737 * For some environments, this rapid decrease is not needed.
738 * With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
740 $exponent = intval(DI::config()->get('system', 'worker_load_exponent', 3));
741 $slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
742 $queues = intval(ceil($slope * $maxqueues));
746 if (DI::config()->get('system', 'worker_jpm')) {
747 $intervals = explode(',', DI::config()->get('system', 'worker_jpm_range'));
748 $jobs_per_minute = [];
749 foreach ($intervals as $interval) {
750 if ($interval == 0) {
753 $interval = (int)$interval;
756 $stamp = (float)microtime(true);
757 $jobs = DBA::count('workerqueue', ["`done` AND `executed` > ?", DateTimeFormat::utc('now - ' . $interval . ' minute')]);
758 self::$db_duration += (microtime(true) - $stamp);
759 self::$db_duration_stat += (microtime(true) - $stamp);
760 $jobs_per_minute[$interval] = number_format($jobs / $interval, 0);
762 $processlist = ' - jpm: '.implode('/', $jobs_per_minute);
765 // Create a list of queue entries grouped by their priority
766 $listitem = [0 => ''];
768 $idle_workers = $active;
770 $deferred = self::deferredEntries();
772 if (DI::config()->get('system', 'worker_debug')) {
773 $waiting_processes = 0;
774 // Now adding all processes with workerqueue entries
775 $stamp = (float)microtime(true);
776 $jobs = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
777 self::$db_duration += (microtime(true) - $stamp);
778 self::$db_duration_stat += (microtime(true) - $stamp);
779 while ($entry = DBA::fetch($jobs)) {
780 $stamp = (float)microtime(true);
781 $running = DBA::count('workerqueue-view', ['priority' => $entry["priority"]]);
782 self::$db_duration += (microtime(true) - $stamp);
783 self::$db_duration_stat += (microtime(true) - $stamp);
784 $idle_workers -= $running;
785 $waiting_processes += $entry["entries"];
786 $listitem[$entry["priority"]] = $entry["priority"] . ":" . $running . "/" . $entry["entries"];
790 $waiting_processes = self::totalEntries();
791 $stamp = (float)microtime(true);
792 $jobs = DBA::p("SELECT COUNT(*) AS `running`, `priority` FROM `workerqueue-view` GROUP BY `priority` ORDER BY `priority`");
793 self::$db_duration += (microtime(true) - $stamp);
794 self::$db_duration_stat += (microtime(true) - $stamp);
796 while ($entry = DBA::fetch($jobs)) {
797 $idle_workers -= $entry["running"];
798 $listitem[$entry["priority"]] = $entry["priority"].":".$entry["running"];
803 $waiting_processes -= $deferred;
805 $listitem[0] = "0:" . max(0, $idle_workers);
807 $processlist .= ' ('.implode(', ', $listitem).')';
809 if (DI::config()->get("system", "worker_fastlane", false) && ($queues > 0) && ($active >= $queues) && self::entriesExists()) {
810 $top_priority = self::highestPriority();
811 $high_running = self::processWithPriorityActive($top_priority);
813 if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
814 Logger::info("Jobs with a higher priority are waiting but none is executed. Open a fastlane.", ['priority' => $top_priority]);
815 $queues = $active + 1;
819 Logger::notice("Load: " . $load ."/" . $maxsysload . " - processes: " . $deferred . "/" . $active . "/" . $waiting_processes . $processlist . " - maximum: " . $queues . "/" . $maxqueues);
821 // Are there fewer workers running as possible? Then fork a new one.
822 if (!DI::config()->get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && self::entriesExists()) {
823 Logger::info("There are fewer workers as possible, fork a new worker.", ['active' => $active, 'queues' => $queues]);
824 if (self::isDaemonMode()) {
825 self::IPCSetJobState(true);
832 // if there are too much worker, we don't spawn a new one.
833 if (self::isDaemonMode() && ($active > $queues)) {
834 self::IPCSetJobState(false);
837 return $active > $queues;
841 * Returns the number of active worker processes
843 * @return integer Number of active worker processes
846 private static function activeWorkers()
848 $stamp = (float)microtime(true);
849 $count = DI::process()->countCommand('Worker.php');
850 self::$db_duration += (microtime(true) - $stamp);
851 self::$db_duration_count += (microtime(true) - $stamp);
856 * Returns the number of active worker processes
858 * @return array List of worker process ids
861 private static function getWorkerPIDList()
864 $stamp = (float)microtime(true);
866 $queues = DBA::p("SELECT `process`.`pid`, COUNT(`workerqueue`.`pid`) AS `entries` FROM `process`
867 LEFT JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `workerqueue`.`done`
868 GROUP BY `process`.`pid`");
869 while ($queue = DBA::fetch($queues)) {
870 $ids[$queue['pid']] = $queue['entries'];
874 self::$db_duration += (microtime(true) - $stamp);
875 self::$db_duration_count += (microtime(true) - $stamp);
880 * Returns waiting jobs for the current process id
882 * @return array waiting workerqueue jobs
885 private static function getWaitingJobForPID()
887 $stamp = (float)microtime(true);
888 $r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
889 self::$db_duration += (microtime(true) - $stamp);
890 if (DBA::isResult($r)) {
891 return DBA::toArray($r);
899 * Returns the next jobs that should be executed
901 * @return array array with next jobs
904 private static function nextProcess(int $limit)
906 $priority = self::nextPriority();
907 if (empty($priority)) {
908 Logger::info('No tasks found');
913 $stamp = (float)microtime(true);
914 $condition = ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()];
915 $tasks = DBA::select('workerqueue', ['id', 'command', 'parameter'], $condition, ['limit' => $limit, 'order' => ['retrial', 'created']]);
916 self::$db_duration += (microtime(true) - $stamp);
917 while ($task = DBA::fetch($tasks)) {
918 $ids[] = $task['id'];
919 // Only continue that loop while we are storing commands that can be processed quickly
920 if (!empty($task['command'])) {
921 $command = $task['command'];
923 $command = json_decode($task['parameter'])[0];
926 if (!in_array($command, self::FAST_COMMANDS)) {
932 Logger::info('Found:', ['priority' => $priority, 'id' => $ids]);
937 * Returns the priority of the next workerqueue job
939 * @return string priority
942 private static function nextPriority()
945 $priorities = [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE];
946 foreach ($priorities as $priority) {
947 $stamp = (float)microtime(true);
948 if (DBA::exists('workerqueue', ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()])) {
949 $waiting[$priority] = true;
951 self::$db_duration += (microtime(true) - $stamp);
954 if (!empty($waiting[PRIORITY_CRITICAL])) {
955 return PRIORITY_CRITICAL;
960 $stamp = (float)microtime(true);
961 $processes = DBA::p("SELECT COUNT(DISTINCT(`pid`)) AS `running`, `priority` FROM `workerqueue-view` GROUP BY `priority`");
962 self::$db_duration += (microtime(true) - $stamp);
963 while ($process = DBA::fetch($processes)) {
964 $running[$process['priority']] = $process['running'];
965 $running_total += $process['running'];
967 DBA::close($processes);
969 foreach ($priorities as $priority) {
970 if (!empty($waiting[$priority]) && empty($running[$priority])) {
971 Logger::info('No running worker found with priority {priority} - assigning it.', ['priority' => $priority]);
976 $active = max(self::activeWorkers(), $running_total);
977 $priorities = max(count($waiting), count($running));
981 for ($i = 1; $i <= $priorities; ++$i) {
982 $total += pow($i, $exponent);
986 for ($i = 1; $i <= $priorities; ++$i) {
987 $limit[$priorities - $i] = max(1, round($active * (pow($i, $exponent) / $total)));
991 foreach ($running as $priority => $workers) {
992 if ($workers < $limit[$i++]) {
993 Logger::info('Priority {priority} has got {workers} workers out of a limit of {limit}', ['priority' => $priority, 'workers' => $workers, 'limit' => $limit[$i - 1]]);
998 if (!empty($waiting)) {
999 $priority = array_keys($waiting)[0];
1000 Logger::info('No underassigned priority found, now taking the highest priority.', ['priority' => $priority]);
1008 * Find and claim the next worker process for us
1010 * @return boolean Have we found something?
1011 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1013 private static function findWorkerProcesses()
1015 $fetch_limit = DI::config()->get('system', 'worker_fetch_limit', 1);
1017 if (DI::config()->get('system', 'worker_multiple_fetch')) {
1019 foreach (self::getWorkerPIDList() as $pid => $count) {
1020 if ($count <= $fetch_limit) {
1027 $limit = $fetch_limit * count($pids);
1029 $pids = [getmypid()];
1030 $limit = $fetch_limit;
1033 $ids = self::nextProcess($limit);
1034 $limit -= count($ids);
1036 // If there is not enough results we check without priority limit
1038 $stamp = (float)microtime(true);
1039 $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
1040 $tasks = DBA::select('workerqueue', ['id', 'command', 'parameter'], $condition, ['limit' => $limit, 'order' => ['priority', 'retrial', 'created']]);
1041 self::$db_duration += (microtime(true) - $stamp);
1043 while ($task = DBA::fetch($tasks)) {
1044 $ids[] = $task['id'];
1045 // Only continue that loop while we are storing commands that can be processed quickly
1046 if (!empty($task['command'])) {
1047 $command = $task['command'];
1049 $command = json_decode($task['parameter'])[0];
1051 if (!in_array($command, self::FAST_COMMANDS)) {
1062 // Assign the task ids to the workers
1064 foreach (array_unique($ids) as $id) {
1067 $pid = reset($pids);
1069 $worker[$pid][] = $id;
1072 $stamp = (float)microtime(true);
1073 foreach ($worker as $worker_pid => $worker_ids) {
1074 Logger::info('Set queue entry', ['pid' => $worker_pid, 'ids' => $worker_ids]);
1075 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $worker_pid],
1076 ['id' => $worker_ids, 'done' => false, 'pid' => 0]);
1078 self::$db_duration += (microtime(true) - $stamp);
1079 self::$db_duration_write += (microtime(true) - $stamp);
1083 * Returns the next worker process
1085 * @return array worker processes
1086 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1088 public static function workerProcess()
1090 // There can already be jobs for us in the queue.
1091 $waiting = self::getWaitingJobForPID();
1092 if (!empty($waiting)) {
1096 $stamp = (float)microtime(true);
1097 if (!DI::lock()->acquire(self::LOCK_PROCESS)) {
1100 self::$lock_duration += (microtime(true) - $stamp);
1102 self::findWorkerProcesses();
1104 DI::lock()->release(self::LOCK_PROCESS);
1106 return self::getWaitingJobForPID();
1110 * Removes a workerqueue entry from the current process
1112 * @param Process $process the process behind the workerqueue
1115 * @throws \Exception
1117 public static function unclaimProcess(Process $process)
1119 $stamp = (float)microtime(true);
1120 DBA::update('workerqueue', ['executed' => DBA::NULL_DATETIME, 'pid' => 0], ['pid' => $process->pid, 'done' => false]);
1121 self::$db_duration += (microtime(true) - $stamp);
1122 self::$db_duration_write += (microtime(true) - $stamp);
1126 * Runs the cron processes
1129 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1131 private static function runCron()
1133 Logger::info('Add cron entries');
1135 // Check for spooled items
1136 self::add(['priority' => PRIORITY_HIGH, 'force_priority' => true], 'SpoolPost');
1138 // Run the cron job that calls all other jobs
1139 self::add(['priority' => PRIORITY_MEDIUM, 'force_priority' => true], 'Cron');
1141 // Cleaning dead processes
1142 self::killStaleWorkers();
1146 * Fork a child process
1148 * @param boolean $do_cron
1151 private static function forkProcess(bool $do_cron)
1153 if (DI::system()->isMinMemoryReached()) {
1154 Logger::warning('Memory limit reached - quitting');
1158 // Children inherit their parent's database connection.
1159 // To avoid problems we disconnect and connect both parent and child
1161 $pid = pcntl_fork();
1164 Logger::warning('Could not spawn worker');
1167 // The parent process continues here
1170 self::IPCSetJobState(true, $pid);
1171 Logger::info('Spawned new worker', ['pid' => $pid]);
1174 while (self::IPCJobsExists($pid) && (++$cycles < 100)) {
1178 Logger::info('Spawned worker is ready', ['pid' => $pid, 'wait_cycles' => $cycles]);
1182 // We now are in the new worker
1186 $process = DI::process()->create(getmypid(), basename(__FILE__));
1189 while (!self::IPCJobsExists($process->pid) && (++$cycles < 100)) {
1193 Logger::info('Worker spawned', ['pid' => $process->pid, 'wait_cycles' => $cycles]);
1195 self::processQueue($do_cron, $process);
1197 self::unclaimProcess($process);
1199 self::IPCSetJobState(false, $process->pid);
1200 DI::process()->delete($process);
1201 Logger::info('Worker ended', ['pid' => $process->pid]);
1206 * Spawns a new worker
1208 * @param bool $do_cron
1210 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1212 public static function spawnWorker($do_cron = false)
1214 if (self::isDaemonMode() && DI::config()->get('system', 'worker_fork')) {
1215 self::forkProcess($do_cron);
1217 DI::system()->run('bin/worker.php', ['no_cron' => !$do_cron]);
1219 if (self::isDaemonMode()) {
1220 self::IPCSetJobState(false);
1225 * Adds tasks to the worker queue
1227 * @param (integer|array) priority or parameter array, strings are deprecated and are ignored
1229 * next args are passed as $cmd command line
1230 * or: Worker::add(PRIORITY_HIGH, "Notifier", Delivery::DELETION, $drop_id);
1231 * or: Worker::add(array('priority' => PRIORITY_HIGH, 'dont_fork' => true), "Delivery", $post_id);
1233 * @return int "0" if worker queue entry already existed or there had been an error, otherwise the ID of the worker task
1234 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1235 * @note $cmd and string args are surrounded with ""
1241 public static function add(...$args)
1243 if (!count($args)) {
1247 $arr = ['args' => $args, 'run_cmd' => true];
1249 Hook::callAll("proc_run", $arr);
1250 if (!$arr['run_cmd'] || !count($args)) {
1254 $priority = PRIORITY_MEDIUM;
1255 // Don't fork from frontend tasks by default
1256 $dont_fork = DI::config()->get("system", "worker_dont_fork", false) || !DI::mode()->isBackend();
1257 $created = DateTimeFormat::utcNow();
1258 $delayed = DBA::NULL_DATETIME;
1259 $force_priority = false;
1261 $run_parameter = array_shift($args);
1263 if (is_int($run_parameter)) {
1264 $priority = $run_parameter;
1265 } elseif (is_array($run_parameter)) {
1266 if (isset($run_parameter['delayed'])) {
1267 $delayed = $run_parameter['delayed'];
1269 if (isset($run_parameter['priority'])) {
1270 $priority = $run_parameter['priority'];
1272 if (isset($run_parameter['created'])) {
1273 $created = $run_parameter['created'];
1275 if (isset($run_parameter['dont_fork'])) {
1276 $dont_fork = $run_parameter['dont_fork'];
1278 if (isset($run_parameter['force_priority'])) {
1279 $force_priority = $run_parameter['force_priority'];
1282 throw new \InvalidArgumentException('Priority number or task parameter array expected as first argument');
1285 $command = array_shift($args);
1286 $parameters = json_encode($args);
1287 $found = DBA::exists('workerqueue', ['command' => $command, 'parameter' => $parameters, 'done' => false]);
1290 if (!in_array($priority, PRIORITIES)) {
1291 Logger::warning('Invalid priority', ['priority' => $priority, 'command' => $command, 'callstack' => System::callstack(20)]);
1292 $priority = PRIORITY_MEDIUM;
1295 // Quit if there was a database error - a precaution for the update process to 3.5.3
1296 if (DBA::errorNo() != 0) {
1301 if (!DBA::insert('workerqueue', ['command' => $command, 'parameter' => $parameters, 'created' => $created,
1302 'priority' => $priority, 'next_try' => $delayed])) {
1305 $added = DBA::lastInsertId();
1306 } elseif ($force_priority) {
1307 DBA::update('workerqueue', ['priority' => $priority], ['command' => $command, 'parameter' => $parameters, 'done' => false, 'pid' => 0]);
1310 // Set the IPC flag to ensure an immediate process execution via daemon
1311 if (self::isDaemonMode()) {
1312 self::IPCSetJobState(true);
1315 self::checkDaemonState();
1317 // Should we quit and wait for the worker to be called as a cronjob?
1322 // If there is a lock then we don't have to check for too much worker
1323 if (!DI::lock()->acquire(self::LOCK_WORKER, 0)) {
1327 // If there are already enough workers running, don't fork another one
1328 $quit = self::tooMuchWorkers();
1329 DI::lock()->release(self::LOCK_WORKER);
1335 // Quit on daemon mode
1336 if (self::isDaemonMode()) {
1340 // Now call the worker to execute the jobs that we just added to the queue
1341 self::spawnWorker();
1346 public static function countWorkersByCommand(string $command)
1348 return DBA::count('workerqueue', ['done' => false, 'pid' => 0, 'command' => $command]);
1352 * Returns the next retrial level for worker jobs.
1353 * This function will skip levels when jobs are older.
1355 * @param array $queue Worker queue entry
1356 * @param integer $max_level maximum retrial level
1357 * @return integer the next retrial level value
1359 private static function getNextRetrial($queue, $max_level)
1361 $created = strtotime($queue['created']);
1362 $retrial_time = time() - $created;
1364 $new_retrial = $queue['retrial'] + 1;
1366 for ($retrial = 0; $retrial <= $max_level + 1; ++$retrial) {
1367 $delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
1369 if (($total < $retrial_time) && ($retrial > $queue['retrial'])) {
1370 $new_retrial = $retrial;
1373 Logger::notice('New retrial for task', ['id' => $queue['id'], 'created' => $queue['created'], 'old' => $queue['retrial'], 'new' => $new_retrial]);
1374 return $new_retrial;
1378 * Defers the current worker entry
1380 * @return boolean had the entry been deferred?
1382 public static function defer()
1384 $queue = DI::app()->getQueue();
1386 if (empty($queue)) {
1390 $retrial = $queue['retrial'];
1392 $priority = $queue['priority'];
1394 $max_level = DI::config()->get('system', 'worker_defer_limit');
1396 $new_retrial = self::getNextRetrial($queue, $max_level);
1398 if ($new_retrial > $max_level) {
1399 Logger::notice('The task exceeded the maximum retry count', ['id' => $id, 'created' => $queue['created'], 'old_prio' => $queue['priority'], 'old_retrial' => $queue['retrial'], 'max_level' => $max_level, 'retrial' => $new_retrial]);
1403 // Calculate the delay until the next trial
1404 $delay = (($new_retrial + 2) ** 4) + (rand(1, 30) * ($new_retrial));
1405 $next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
1407 if (($priority < PRIORITY_MEDIUM) && ($new_retrial > 3)) {
1408 $priority = PRIORITY_MEDIUM;
1409 } elseif (($priority < PRIORITY_LOW) && ($new_retrial > 6)) {
1410 $priority = PRIORITY_LOW;
1411 } elseif (($priority < PRIORITY_NEGLIGIBLE) && ($new_retrial > 8)) {
1412 $priority = PRIORITY_NEGLIGIBLE;
1415 Logger::info('Deferred task', ['id' => $id, 'retrial' => $new_retrial, 'created' => $queue['created'], 'next_execution' => $next, 'old_prio' => $queue['priority'], 'new_prio' => $priority]);
1417 $stamp = (float)microtime(true);
1418 $fields = ['retrial' => $new_retrial, 'next_try' => $next, 'executed' => DBA::NULL_DATETIME, 'pid' => 0, 'priority' => $priority];
1419 DBA::update('workerqueue', $fields, ['id' => $id]);
1420 self::$db_duration += (microtime(true) - $stamp);
1421 self::$db_duration_write += (microtime(true) - $stamp);
1427 * Set the flag if some job is waiting
1429 * @param boolean $jobs Is there a waiting job?
1430 * @param int $key Key number
1431 * @throws \Exception
1433 public static function IPCSetJobState(bool $jobs, int $key = 0)
1435 $stamp = (float)microtime(true);
1436 DBA::replace('worker-ipc', ['jobs' => $jobs, 'key' => $key]);
1437 self::$db_duration += (microtime(true) - $stamp);
1438 self::$db_duration_write += (microtime(true) - $stamp);
1442 * Delete a key entry
1444 * @param int $key Key number
1445 * @throws \Exception
1447 public static function IPCDeleteJobState(int $key)
1449 $stamp = (float)microtime(true);
1450 DBA::delete('worker-ipc', ['key' => $key]);
1451 self::$db_duration += (microtime(true) - $stamp);
1452 self::$db_duration_write += (microtime(true) - $stamp);
1456 * Checks if some worker job waits to be executed
1458 * @param int $key Key number
1460 * @throws \Exception
1462 public static function IPCJobsExists(int $key = 0)
1464 $stamp = (float)microtime(true);
1465 $row = DBA::selectFirst('worker-ipc', ['jobs'], ['key' => $key]);
1466 self::$db_duration += (microtime(true) - $stamp);
1468 // When we don't have a row, no job is running
1469 if (!DBA::isResult($row)) {
1473 return (bool)$row['jobs'];
1477 * Checks if the worker is running in the daemon mode.
1481 public static function isDaemonMode()
1483 if (!is_null(self::$daemon_mode)) {
1484 return self::$daemon_mode;
1487 if (DI::mode()->getExecutor() == Mode::DAEMON) {
1491 $daemon_mode = DI::config()->get('system', 'worker_daemon_mode', false, true);
1493 return $daemon_mode;
1496 if (!function_exists('pcntl_fork')) {
1497 self::$daemon_mode = false;
1501 $pidfile = DI::config()->get('system', 'pidfile');
1502 if (empty($pidfile)) {
1503 // No pid file, no daemon
1504 self::$daemon_mode = false;
1508 if (!is_readable($pidfile)) {
1509 // No pid file. We assume that the daemon had been intentionally stopped.
1510 self::$daemon_mode = false;
1514 $pid = intval(file_get_contents($pidfile));
1515 $running = posix_kill($pid, 0);
1517 self::$daemon_mode = $running;
1522 * Test if the daemon is running. If not, it will be started
1526 private static function checkDaemonState()
1528 if (!DI::config()->get('system', 'daemon_watchdog', false)) {
1532 if (!DI::mode()->isNormal()) {
1536 // Check every minute if the daemon is running
1537 if (DI::config()->get('system', 'last_daemon_check', 0) + 60 > time()) {
1541 DI::config()->set('system', 'last_daemon_check', time());
1543 $pidfile = DI::config()->get('system', 'pidfile');
1544 if (empty($pidfile)) {
1545 // No pid file, no daemon
1549 if (!is_readable($pidfile)) {
1550 // No pid file. We assume that the daemon had been intentionally stopped.
1554 $pid = intval(file_get_contents($pidfile));
1555 if (posix_kill($pid, 0)) {
1556 Logger::info('Daemon process is running', ['pid' => $pid]);
1560 Logger::warning('Daemon process is not running', ['pid' => $pid]);
1562 self::spawnDaemon();
1566 * Spawn a new daemon process
1570 private static function spawnDaemon()
1572 Logger::notice('Starting new daemon process');
1573 $command = 'bin/daemon.php';
1575 DI::system()->run($command, ['start']);
1576 Logger::notice('New daemon process started');
1580 * Check if the system is inside the defined maintenance window
1584 public static function isInMaintenanceWindow(bool $check_last_execution = false)
1586 // Calculate the seconds of the start end end of the maintenance window
1587 $start = strtotime(DI::config()->get('system', 'maintenance_start')) % 86400;
1588 $end = strtotime(DI::config()->get('system', 'maintenance_end')) % 86400;
1590 Logger::info('Maintenance window', ['start' => date('H:i:s', $start), 'end' => date('H:i:s', $end)]);
1592 if ($check_last_execution) {
1593 // Calculate the window duration
1594 $duration = max($start, $end) - min($start, $end);
1596 // Quit when the last cron execution had been after the previous window
1597 $last_cron = DI::config()->get('system', 'last_cron_daily');
1598 if ($last_cron + $duration > time()) {
1599 Logger::info('The Daily cron had been executed recently', ['last' => date(DateTimeFormat::MYSQL, $last_cron), 'start' => date('H:i:s', $start), 'end' => date('H:i:s', $end)]);
1604 $current = time() % 86400;
1606 if ($start < $end) {
1607 // Execute if we are inside the window
1608 $execute = ($current >= $start) && ($current <= $end);
1610 // Don't execute if we are outside the window
1611 $execute = !(($current > $end) && ($current < $start));
1615 Logger::info('We are inside the maintenance window', ['current' => date('H:i:s', $current), 'start' => date('H:i:s', $start), 'end' => date('H:i:s', $end)]);
1617 Logger::info('We are outside the maintenance window', ['current' => date('H:i:s', $current), 'start' => date('H:i:s', $start), 'end' => date('H:i:s', $end)]);