src/Core/Worker.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   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.
  11  *
  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.
  16  *
  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/>.
  19  *
  20  */
  21
  22 namespace Friendica\Core;
  23
  24 use Friendica\Core\Worker\Entity\Process;
  25 use Friendica\Database\DBA;
  26 use Friendica\DI;
  27 use Friendica\Util\DateTimeFormat;
  28
  29 /**
  30  * Contains the class for the worker background job processing
  31  */
  32 class Worker
  33 {
  34         /**
  35          * @name Priority
  36          *
  37          * Process priority for the worker
  38          * @{
  39          */
  40         const PRIORITY_UNDEFINED  = 0;
  41         const PRIORITY_CRITICAL   = 10;
  42         const PRIORITY_HIGH       = 20;
  43         const PRIORITY_MEDIUM     = 30;
  44         const PRIORITY_LOW        = 40;
  45         const PRIORITY_NEGLIGIBLE = 50;
  46         const PRIORITIES          = [self::PRIORITY_CRITICAL, self::PRIORITY_HIGH, self::PRIORITY_MEDIUM, self::PRIORITY_LOW, self::PRIORITY_NEGLIGIBLE];
  47         /* @}*/
  48
  49         const STATE_STARTUP    = 1; // Worker is in startup. This takes most time.
  50         const STATE_LONG_LOOP  = 2; // Worker is processing the whole - long - loop.
  51         const STATE_REFETCH    = 3; // Worker had refetched jobs in the execution loop.
  52         const STATE_SHORT_LOOP = 4; // Worker is processing preassigned jobs, thus saving much time.
  53
  54         const FAST_COMMANDS = ['APDelivery', 'Delivery'];
  55
  56         const LOCK_PROCESS = 'worker_process';
  57         const LOCK_WORKER = 'worker';
  58
  59         private static $up_start;
  60         private static $db_duration = 0;
  61         private static $db_duration_count = 0;
  62         private static $db_duration_write = 0;
  63         private static $db_duration_stat = 0;
  64         private static $lock_duration = 0;
  65         private static $last_update;
  66         private static $state;
  67         /** @var Process */
  68         private static $process;
  69
  70         /**
  71          * Processes the tasks that are in the workerqueue table
  72          *
  73          * @param boolean $run_cron Should the cron processes be executed?
  74          * @param Process $process  The current running process
  75          * @return void
  76          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  77          */
  78         public static function processQueue(bool $run_cron, Process $process)
  79         {
  80                 self::$up_start = microtime(true);
  81
  82                 // At first check the maximum load. We shouldn't continue with a high load
  83                 if (DI::system()->isMaxLoadReached()) {
  84                         Logger::notice('Pre check: maximum load reached, quitting.');
  85                         return;
  86                 }
  87
  88                 // We now start the process. This is done after the load check since this could increase the load.
  89                 self::$process = $process;
  90
  91                 // Kill stale processes every 5 minutes
  92                 $last_cleanup = DI::keyValue()->get('worker_last_cleaned') ?? 0;
  93                 if (time() > ($last_cleanup + 300)) {
  94                         DI::keyValue()->set( 'worker_last_cleaned', time());
  95                         Worker\Cron::killStaleWorkers();
  96                 }
  97
  98                 // Check if the system is ready
  99                 if (!self::isReady()) {
 100                         return;
 101                 }
 102
 103                 // Now we start additional cron processes if we should do so
 104                 if ($run_cron) {
 105                         Worker\Cron::run();
 106                 }
 107
 108                 $last_check = $starttime = time();
 109                 self::$state = self::STATE_STARTUP;
 110
 111                 // We fetch the next queue entry that is about to be executed
 112                 while ($r = self::workerProcess()) {
 113                         if (Worker\IPC::JobsExists(getmypid())) {
 114                                 Worker\IPC::DeleteJobState(getmypid());
 115                         }
 116
 117                         // Don't refetch when a worker fetches tasks for multiple workers
 118                         $refetched = DI::config()->get('system', 'worker_multiple_fetch');
 119                         foreach ($r as $entry) {
 120                                 // The work will be done
 121                                 if (!self::execute($entry)) {
 122                                         Logger::warning('Process execution failed, quitting.', ['entry' => $entry]);
 123                                         return;
 124                                 }
 125
 126                                 // Trying to fetch new processes - but only once when successful
 127                                 if (!$refetched && DI::lock()->acquire(self::LOCK_PROCESS, 0)) {
 128                                         self::findWorkerProcesses();
 129                                         DI::lock()->release(self::LOCK_PROCESS);
 130                                         self::$state = self::STATE_REFETCH;
 131                                         $refetched = true;
 132                                 } else {
 133                                         self::$state = self::STATE_SHORT_LOOP;
 134                                 }
 135                         }
 136
 137                         // To avoid the quitting of multiple workers only one worker at a time will execute the check
 138                         if ((time() > $last_check + 5) && !self::getWaitingJobForPID()) {
 139                                 self::$state = self::STATE_LONG_LOOP;
 140
 141                                 if (DI::lock()->acquire(self::LOCK_WORKER, 0)) {
 142                                 // Count active workers and compare them with a maximum value that depends on the load
 143                                         if (self::tooMuchWorkers()) {
 144                                                 Logger::info('Active worker limit reached, quitting.');
 145                                                 DI::lock()->release(self::LOCK_WORKER);
 146                                                 return;
 147                                         }
 148
 149                                         // Check free memory
 150                                         if (DI::system()->isMinMemoryReached()) {
 151                                                 Logger::warning('Memory limit reached, quitting.');
 152                                                 DI::lock()->release(self::LOCK_WORKER);
 153                                                 return;
 154                                         }
 155                                         DI::lock()->release(self::LOCK_WORKER);
 156                                 }
 157                                 $last_check = time();
 158                         }
 159
 160                         // Quit the worker once every cron interval
 161                         if (time() > ($starttime + (DI::config()->get('system', 'cron_interval') * 60)) && !self::systemLimitReached()) {
 162                                 Logger::info('Process lifetime reached, respawning.');
 163                                 self::unclaimProcess($process);
 164                                 if (Worker\Daemon::isMode()) {
 165                                         Worker\IPC::SetJobState(true);
 166                                 } else {
 167                                         self::spawnWorker();
 168                                 }
 169                                 return;
 170                         }
 171                 }
 172
 173                 // Cleaning up. Possibly not needed, but it doesn't harm anything.
 174                 if (Worker\Daemon::isMode()) {
 175                         Worker\IPC::SetJobState(false);
 176                 }
 177                 Logger::info("Couldn't select a workerqueue entry, quitting process", ['pid' => getmypid()]);
 178         }
 179
 180         /**
 181          * Checks if the system is ready.
 182          *
 183          * Several system parameters like memory, connections and processes are checked.
 184          *
 185          * @return boolean
 186          */
 187         public static function isReady(): bool
 188         {
 189                 // Count active workers and compare them with a maximum value that depends on the load
 190                 if (self::tooMuchWorkers()) {
 191                         Logger::info('Active worker limit reached, quitting.');
 192                         return false;
 193                 }
 194
 195                 // Do we have too few memory?
 196                 if (DI::system()->isMinMemoryReached()) {
 197                         Logger::warning('Memory limit reached, quitting.');
 198                         return false;
 199                 }
 200
 201                 // Possibly there are too much database connections
 202                 if (self::maxConnectionsReached()) {
 203                         Logger::warning('Maximum connections reached, quitting.');
 204                         return false;
 205                 }
 206
 207                 // Possibly there are too much database processes that block the system
 208                 if (DI::system()->isMaxProcessesReached()) {
 209                         Logger::warning('Maximum processes reached, quitting.');
 210                         return false;
 211                 }
 212
 213                 return true;
 214         }
 215
 216         /**
 217          * Check if non executed tasks do exist in the worker queue
 218          *
 219          * @return boolean Returns "true" if tasks are existing
 220          * @throws \Exception
 221          */
 222         public static function entriesExists(): bool
 223         {
 224                 $stamp = (float)microtime(true);
 225                 $exists = DBA::exists('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` < ?", DateTimeFormat::utcNow()]);
 226                 self::$db_duration += (microtime(true) - $stamp);
 227                 return $exists;
 228         }
 229
 230         /**
 231          * Returns the number of deferred entries in the worker queue
 232          *
 233          * @return integer Number of deferred entries in the worker queue
 234          * @throws \Exception
 235          */
 236         private static function deferredEntries(): int
 237         {
 238                 $stamp = (float)microtime(true);
 239                 $count = DBA::count('workerqueue', ["NOT `done` AND `pid` = 0 AND `retrial` > ?", 0]);
 240                 self::$db_duration += (microtime(true) - $stamp);
 241                 self::$db_duration_count += (microtime(true) - $stamp);
 242                 return $count;
 243         }
 244
 245         /**
 246          * Returns the number of non executed entries in the worker queue
 247          *
 248          * @return integer Number of non executed entries in the worker queue
 249          * @throws \Exception
 250          */
 251         private static function totalEntries(): int
 252         {
 253                 $stamp = (float)microtime(true);
 254                 $count = DBA::count('workerqueue', ['done' => false, 'pid' => 0]);
 255                 self::$db_duration += (microtime(true) - $stamp);
 256                 self::$db_duration_count += (microtime(true) - $stamp);
 257                 return $count;
 258         }
 259
 260         /**
 261          * Returns the highest priority in the worker queue that isn't executed
 262          *
 263          * @return integer Number of active worker processes
 264          * @throws \Exception
 265          */
 266         private static function highestPriority(): int
 267         {
 268                 $stamp = (float)microtime(true);
 269                 $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
 270                 $workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
 271                 self::$db_duration += (microtime(true) - $stamp);
 272                 if (DBA::isResult($workerqueue)) {
 273                         return $workerqueue['priority'];
 274                 } else {
 275                         return 0;
 276                 }
 277         }
 278
 279         /**
 280          * Returns if a process with the given priority is running
 281          *
 282          * @param integer $priority The priority that should be checked
 283          *
 284          * @return integer Is there a process running with that priority?
 285          * @throws \Exception
 286          */
 287         private static function processWithPriorityActive(int $priority): int
 288         {
 289                 $condition = ["`priority` <= ? AND `pid` != 0 AND NOT `done`", $priority];
 290                 return DBA::exists('workerqueue', $condition);
 291         }
 292
 293         /**
 294          * Checks if the given file is valid to be included
 295          *
 296          * @param mixed $file
 297          * @return bool
 298          */
 299         private static function validateInclude(&$file): bool
 300         {
 301                 $orig_file = $file;
 302
 303                 $file = realpath($file);
 304
 305                 if (strpos($file, getcwd()) !== 0) {
 306                         return false;
 307                 }
 308
 309                 $file = str_replace(getcwd() . '/', '', $file, $count);
 310                 if ($count != 1) {
 311                         return false;
 312                 }
 313
 314                 if ($orig_file !== $file) {
 315                         return false;
 316                 }
 317
 318                 return (strpos($file, 'addon/') === 0);
 319         }
 320
 321         /**
 322          * Execute a worker entry
 323          *
 324          * @param array $queue Workerqueue entry
 325          *
 326          * @return boolean "true" if further processing should be stopped
 327          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 328          */
 329         public static function execute(array $queue): bool
 330         {
 331                 $mypid = getmypid();
 332
 333                 // Quit when in maintenance
 334                 if (DI::config()->get('system', 'maintenance', false)) {
 335                         Logger::notice('Maintenance mode - quit process', ['pid' => $mypid]);
 336                         return false;
 337                 }
 338
 339                 // Constantly check the number of parallel database processes
 340                 if (DI::system()->isMaxProcessesReached()) {
 341                         Logger::warning('Max processes reached for process', ['pid' => $mypid]);
 342                         return false;
 343                 }
 344
 345                 // Constantly check the number of available database connections to let the frontend be accessible at any time
 346                 if (self::maxConnectionsReached()) {
 347                         Logger::warning('Max connection reached for process', ['pid' => $mypid]);
 348                         return false;
 349                 }
 350
 351                 $argv = json_decode($queue['parameter'], true);
 352                 if (!is_array($argv)) {
 353                         $argv = [];
 354                 }
 355
 356                 if (!empty($queue['command'])) {
 357                         array_unshift($argv, $queue['command']);
 358                 }
 359
 360                 if (empty($argv)) {
 361                         Logger::warning('Parameter is empty', ['queue' => $queue]);
 362                         return false;
 363                 }
 364
 365                 // Check for existence and validity of the include file
 366                 $include = $argv[0];
 367
 368                 if (method_exists(sprintf('Friendica\Worker\%s', $include), 'execute')) {
 369                         // We constantly update the "executed" date every minute to avoid being killed too soon
 370                         if (!isset(self::$last_update)) {
 371                                 self::$last_update = strtotime($queue['executed']);
 372                         }
 373
 374                         $age = (time() - self::$last_update) / 60;
 375                         self::$last_update = time();
 376
 377                         if ($age > 1) {
 378                                 $stamp = (float)microtime(true);
 379                                 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 380                                 self::$db_duration += (microtime(true) - $stamp);
 381                                 self::$db_duration_write += (microtime(true) - $stamp);
 382                         }
 383
 384                         array_shift($argv);
 385
 386                         self::execFunction($queue, $include, $argv, true);
 387
 388                         $stamp = (float)microtime(true);
 389                         $condition = ["`id` = ? AND `next_try` < ?", $queue['id'], DateTimeFormat::utcNow()];
 390                         if (DBA::update('workerqueue', ['done' => true], $condition)) {
 391                                 DI::keyValue()->set('last_worker_execution', DateTimeFormat::utcNow());
 392                         }
 393                         self::$db_duration = (microtime(true) - $stamp);
 394                         self::$db_duration_write += (microtime(true) - $stamp);
 395
 396                         return true;
 397                 }
 398
 399                 if (!self::validateInclude($include)) {
 400                         Logger::warning('Include file is not valid', ['file' => $argv[0]]);
 401                         $stamp = (float)microtime(true);
 402                         DBA::delete('workerqueue', ['id' => $queue['id']]);
 403                         self::$db_duration = (microtime(true) - $stamp);
 404                         self::$db_duration_write += (microtime(true) - $stamp);
 405                         return true;
 406                 }
 407
 408                 require_once $include;
 409
 410                 $funcname = str_replace('.php', '', basename($argv[0])) .'_run';
 411
 412                 if (function_exists($funcname)) {
 413                         // We constantly update the "executed" date every minute to avoid being killed too soon
 414                         if (!isset(self::$last_update)) {
 415                                 self::$last_update = strtotime($queue['executed']);
 416                         }
 417
 418                         $age = (time() - self::$last_update) / 60;
 419                         self::$last_update = time();
 420
 421                         if ($age > 1) {
 422                                 $stamp = (float)microtime(true);
 423                                 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 424                                 self::$db_duration += (microtime(true) - $stamp);
 425                                 self::$db_duration_write += (microtime(true) - $stamp);
 426                         }
 427
 428                         self::execFunction($queue, $funcname, $argv, false);
 429
 430                         $stamp = (float)microtime(true);
 431                         if (DBA::update('workerqueue', ['done' => true], ['id' => $queue['id']])) {
 432                                 DI::keyValue()->set('last_worker_execution', DateTimeFormat::utcNow());
 433                         }
 434                         self::$db_duration = (microtime(true) - $stamp);
 435                         self::$db_duration_write += (microtime(true) - $stamp);
 436                 } else {
 437                         Logger::warning('Function does not exist', ['function' => $funcname]);
 438                         $stamp = (float)microtime(true);
 439                         DBA::delete('workerqueue', ['id' => $queue['id']]);
 440                         self::$db_duration = (microtime(true) - $stamp);
 441                         self::$db_duration_write += (microtime(true) - $stamp);
 442                 }
 443
 444                 return true;
 445         }
 446
 447         /**
 448          * Checks if system limits are reached.
 449          *
 450          * @return boolean
 451          */
 452         private static function systemLimitReached(): bool
 453         {
 454                 $load_cooldown      = DI::config()->get('system', 'worker_load_cooldown');
 455                 $processes_cooldown = DI::config()->get('system', 'worker_processes_cooldown');
 456
 457                 if ($load_cooldown == 0) {
 458                         $load_cooldown = DI::config()->get('system', 'maxloadavg');
 459                 }
 460
 461                 if (($load_cooldown == 0) && ($processes_cooldown == 0)) {
 462                         return false;
 463                 }
 464
 465                 $load = System::getLoadAvg($processes_cooldown != 0);
 466                 if (empty($load)) {
 467                         return false;
 468                 }
 469
 470                 if (($load_cooldown > 0) && ($load['average1'] > $load_cooldown)) {
 471                         return true;
 472                 }
 473
 474                 if (($processes_cooldown > 0) && ($load['scheduled'] > $processes_cooldown)) {
 475                         return true;
 476                 }
 477
 478                 return false;
 479         }
 480
 481         /**
 482          * Slow the execution down if the system load is too high
 483          *
 484          * @return void
 485          */
 486         public static function coolDown()
 487         {
 488                 $cooldown = DI::config()->get('system', 'worker_cooldown', 0);
 489                 if ($cooldown > 0) {
 490                         Logger::debug('Wait for cooldown.', ['cooldown' => $cooldown]);
 491                         if ($cooldown < 1) {
 492                                 usleep($cooldown * 1000000);
 493                         } else {
 494                                 sleep($cooldown);
 495                         }
 496                 }
 497
 498                 $load_cooldown      = DI::config()->get('system', 'worker_load_cooldown');
 499                 $processes_cooldown = DI::config()->get('system', 'worker_processes_cooldown');
 500
 501                 if ($load_cooldown == 0) {
 502                         $load_cooldown = DI::config()->get('system', 'maxloadavg');
 503                 }
 504
 505                 if (($load_cooldown == 0) && ($processes_cooldown == 0)) {
 506                         return;
 507                 }
 508
 509                 $sleeping = false;
 510
 511                 while ($load = System::getLoadAvg($processes_cooldown != 0)) {
 512                         if (($load_cooldown > 0) && ($load['average1'] > $load_cooldown)) {
 513                                 if (!$sleeping) {
 514                                         Logger::info('Load induced pre execution cooldown.', ['max' => $load_cooldown, 'load' => $load, 'called-by' => System::callstack(1)]);
 515                                         $sleeping = true;
 516                                 }
 517                                 sleep(1);
 518                                 continue;
 519                         }
 520                         if (($processes_cooldown > 0) && ($load['scheduled'] > $processes_cooldown)) {
 521                                 if (!$sleeping) {
 522                                         Logger::info('Process induced pre execution cooldown.', ['max' => $processes_cooldown, 'load' => $load, 'called-by' => System::callstack(1)]);
 523                                         $sleeping = true;
 524                                 }
 525                                 sleep(1);
 526                                 continue;
 527                         }
 528                         break;
 529                 }
 530
 531                 if ($sleeping) {
 532                         Logger::info('Cooldown ended.', ['max-load' => $load_cooldown, 'max-processes' => $processes_cooldown, 'load' => $load, 'called-by' => System::callstack(1)]);
 533                 }
 534         }
 535
 536         /**
 537          * Execute a function from the queue
 538          *
 539          * @param array   $queue       Workerqueue entry
 540          * @param string  $funcname    name of the function
 541          * @param array   $argv        Array of values to be passed to the function
 542          * @param boolean $method_call boolean
 543          * @return void
 544          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 545          */
 546         private static function execFunction(array $queue, string $funcname, array $argv, bool $method_call)
 547         {
 548                 $a = DI::app();
 549
 550                 self::coolDown();
 551
 552                 Logger::enableWorker($funcname);
 553
 554                 Logger::info('Process start.', ['priority' => $queue['priority'], 'id' => $queue['id']]);
 555
 556                 $stamp = (float)microtime(true);
 557
 558                 // We use the callstack here to analyze the performance of executed worker entries.
 559                 // For this reason the variables have to be initialized.
 560                 DI::profiler()->reset();
 561
 562                 $a->setQueue($queue);
 563
 564                 $up_duration = microtime(true) - self::$up_start;
 565
 566                 // Reset global data to avoid interferences
 567                 unset($_SESSION);
 568
 569                 // Set the workerLogger as new default logger
 570                 if ($method_call) {
 571                         try {
 572                                 call_user_func_array(sprintf('Friendica\Worker\%s::execute', $funcname), $argv);
 573                         } catch (\TypeError $e) {
 574                                 // No need to defer a worker queue entry if the arguments are invalid
 575                                 Logger::notice('Wrong worker arguments', ['class' => $funcname, 'argv' => $argv, 'queue' => $queue, 'message' => $e->getMessage()]);
 576                         } catch (\Throwable $e) {
 577                                 Logger::error('Uncaught exception in worker execution', ['class' => get_class($e), 'message' => $e->getMessage(), 'code' => $e->getCode(), 'file' => $e->getFile() . ':' . $e->getLine(), 'trace' => $e->getTraceAsString(), 'previous' => $e->getPrevious()]);
 578                                 Worker::defer();
 579                         }
 580                 } else {
 581                         $funcname($argv, count($argv));
 582                 }
 583
 584                 Logger::disableWorker();
 585
 586                 $a->setQueue([]);
 587
 588                 $duration = (microtime(true) - $stamp);
 589
 590                 /* With these values we can analyze how effective the worker is.
 591                  * The database and rest time should be low since this is the unproductive time.
 592                  * The execution time is the productive time.
 593                  * By changing parameters like the maximum number of workers we can check the effectiveness.
 594                 */
 595                 $dbtotal = round(self::$db_duration, 2);
 596                 $dbread  = round(self::$db_duration - (self::$db_duration_count + self::$db_duration_write + self::$db_duration_stat), 2);
 597                 $dbcount = round(self::$db_duration_count, 2);
 598                 $dbstat  = round(self::$db_duration_stat, 2);
 599                 $dbwrite = round(self::$db_duration_write, 2);
 600                 $dblock  = round(self::$lock_duration, 2);
 601                 $rest    = round(max(0, $up_duration - (self::$db_duration + self::$lock_duration)), 2);
 602                 $exec    = round($duration, 2);
 603
 604                 Logger::info('Performance:', ['function' => $funcname, 'state' => self::$state, 'count' => $dbcount, 'stat' => $dbstat, 'write' => $dbwrite, 'lock' => $dblock, 'total' => $dbtotal, 'rest' => $rest, 'exec' => $exec]);
 605
 606                 self::coolDown();
 607
 608                 self::$up_start = microtime(true);
 609                 self::$db_duration = 0;
 610                 self::$db_duration_count = 0;
 611                 self::$db_duration_stat = 0;
 612                 self::$db_duration_write = 0;
 613                 self::$lock_duration = 0;
 614
 615                 if ($duration > 3600) {
 616                         Logger::info('Longer than 1 hour.', ['priority' => $queue['priority'], 'id' => $queue['id'], 'duration' => round($duration/60, 3)]);
 617                 } elseif ($duration > 600) {
 618                         Logger::info('Longer than 10 minutes.', ['priority' => $queue['priority'], 'id' => $queue['id'], 'duration' => round($duration/60, 3)]);
 619                 } elseif ($duration > 300) {
 620                         Logger::info('Longer than 5 minutes.', ['priority' => $queue['priority'], 'id' => $queue['id'], 'duration' => round($duration/60, 3)]);
 621                 } elseif ($duration > 120) {
 622                         Logger::info('Longer than 2 minutes.', ['priority' => $queue['priority'], 'id' => $queue['id'], 'duration' => round($duration/60, 3)]);
 623                 }
 624
 625                 Logger::info('Process done.', ['function' => $funcname, 'priority' => $queue['priority'], 'retrial' => $queue['retrial'], 'id' => $queue['id'], 'duration' => round($duration, 3)]);
 626
 627                 DI::profiler()->saveLog(DI::logger(), 'ID ' . $queue['id'] . ': ' . $funcname);
 628         }
 629
 630         /**
 631          * Checks if the number of database connections has reached a critical limit.
 632          *
 633          * @return bool Are more than 3/4 of the maximum connections used?
 634          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 635          */
 636         private static function maxConnectionsReached(): bool
 637         {
 638                 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 639                 $max = DI::config()->get('system', 'max_connections');
 640
 641                 // Fetch the percentage level where the worker will get active
 642                 $maxlevel = DI::config()->get('system', 'max_connections_level', 75);
 643
 644                 if ($max == 0) {
 645                         // the maximum number of possible user connections can be a system variable
 646                         $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 647                         if (DBA::isResult($r)) {
 648                                 $max = $r['Value'];
 649                         }
 650                         // Or it can be granted. This overrides the system variable
 651                         $stamp = (float)microtime(true);
 652                         $r = DBA::p('SHOW GRANTS');
 653                         self::$db_duration += (microtime(true) - $stamp);
 654                         while ($grants = DBA::fetch($r)) {
 655                                 $grant = array_pop($grants);
 656                                 if (stristr($grant, "GRANT USAGE ON")) {
 657                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
 658                                                 $max = $match[1];
 659                                         }
 660                                 }
 661                         }
 662                         DBA::close($r);
 663                 }
 664
 665                 $stamp = (float)microtime(true);
 666                 $used  = 0;
 667                 $sleep = 0;
 668                 $data = DBA::p("SHOW PROCESSLIST");
 669                 while ($row = DBA::fetch($data)) {
 670                         if ($row['Command'] != 'Sleep') {
 671                                 ++$used;
 672                         } else {
 673                                 ++$sleep;
 674                         }
 675                 }
 676                 DBA::close($data);
 677                 self::$db_duration += (microtime(true) - $stamp);
 678
 679                 // If $max is set we will use the processlist to determine the current number of connections
 680                 // The processlist only shows entries of the current user
 681                 if ($max != 0) {
 682                         Logger::info('Connection usage (user values)', ['working' => $used, 'sleeping' => $sleep, 'max' => $max]);
 683
 684                         $level = ($used / $max) * 100;
 685
 686                         if ($level >= $maxlevel) {
 687                                 Logger::warning('Maximum level (' . $maxlevel . '%) of user connections reached: ' . $used .'/' . $max);
 688                                 return true;
 689                         }
 690                 }
 691
 692                 // We will now check for the system values.
 693                 // This limit could be reached although the user limits are fine.
 694                 $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 695                 if (!DBA::isResult($r)) {
 696                         return false;
 697                 }
 698                 $max = intval($r['Value']);
 699                 if ($max == 0) {
 700                         return false;
 701                 }
 702                 $r = DBA::fetchFirst("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 703                 if (!DBA::isResult($r)) {
 704                         return false;
 705                 }
 706                 $used = max($used, intval($r['Value'])) - $sleep;
 707                 if ($used == 0) {
 708                         return false;
 709                 }
 710                 Logger::info('Connection usage (system values)', ['working' => $used, 'sleeping' => $sleep, 'max' => $max]);
 711
 712                 $level = $used / $max * 100;
 713
 714                 if ($level < $maxlevel) {
 715                         return false;
 716                 }
 717                 Logger::warning('Maximum level (' . $level . '%) of system connections reached: ' . $used . '/' . $max);
 718                 return true;
 719         }
 720
 721
 722         /**
 723          * Checks if the number of active workers exceeds the given limits
 724          *
 725          * @return bool Are there too much workers running?
 726          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 727          */
 728         private static function tooMuchWorkers(): bool
 729         {
 730                 $queues = DI::config()->get('system', 'worker_queues', 10);
 731
 732                 $maxqueues = $queues;
 733
 734                 $active = self::activeWorkers();
 735
 736                 // Decrease the number of workers at higher load
 737                 $load = System::currentLoad();
 738                 if ($load) {
 739                         $maxsysload = intval(DI::config()->get('system', 'maxloadavg', 20));
 740
 741                         /* Default exponent 3 causes queues to rapidly decrease as load increases.
 742                          * If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
 743                          * For some environments, this rapid decrease is not needed.
 744                          * With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
 745                          */
 746                         $exponent = intval(DI::config()->get('system', 'worker_load_exponent', 3));
 747                         $slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
 748                         $queues = intval(ceil($slope * $maxqueues));
 749
 750                         $processlist = '';
 751
 752                         if (DI::config()->get('system', 'worker_jpm')) {
 753                                 $intervals = explode(',', DI::config()->get('system', 'worker_jpm_range'));
 754                                 $jobs_per_minute = [];
 755                                 foreach ($intervals as $interval) {
 756                                         if ($interval == 0) {
 757                                                 continue;
 758                                         } else {
 759                                                 $interval = (int)$interval;
 760                                         }
 761
 762                                         $stamp = (float)microtime(true);
 763                                         $jobs = DBA::count('workerqueue', ["`done` AND `executed` > ?", DateTimeFormat::utc('now - ' . $interval . ' minute')]);
 764                                         self::$db_duration += (microtime(true) - $stamp);
 765                                         self::$db_duration_stat += (microtime(true) - $stamp);
 766                                         $jobs_per_minute[$interval] = number_format($jobs / $interval, 0);
 767                                 }
 768                                 $processlist = ' - jpm: '.implode('/', $jobs_per_minute);
 769                         }
 770
 771                         // Create a list of queue entries grouped by their priority
 772                         $listitem = [0 => ''];
 773
 774                         $idle_workers = $active;
 775
 776                         $deferred = self::deferredEntries();
 777
 778                         if (DI::config()->get('system', 'worker_debug')) {
 779                                 $waiting_processes = 0;
 780                                 // Now adding all processes with workerqueue entries
 781                                 $stamp = (float)microtime(true);
 782                                 $jobs = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
 783                                 self::$db_duration += (microtime(true) - $stamp);
 784                                 self::$db_duration_stat += (microtime(true) - $stamp);
 785                                 while ($entry = DBA::fetch($jobs)) {
 786                                         $stamp = (float)microtime(true);
 787                                         $running = DBA::count('workerqueue-view', ['priority' => $entry['priority']]);
 788                                         self::$db_duration += (microtime(true) - $stamp);
 789                                         self::$db_duration_stat += (microtime(true) - $stamp);
 790                                         $idle_workers -= $running;
 791                                         $waiting_processes += $entry['entries'];
 792                                         $listitem[$entry['priority']] = $entry['priority'] . ':' . $running . '/' . $entry['entries'];
 793                                 }
 794                                 DBA::close($jobs);
 795                         } else {
 796                                 $waiting_processes =  self::totalEntries();
 797                                 $stamp = (float)microtime(true);
 798                                 $jobs = DBA::p("SELECT COUNT(*) AS `running`, `priority` FROM `workerqueue-view` GROUP BY `priority` ORDER BY `priority`");
 799                                 self::$db_duration += (microtime(true) - $stamp);
 800                                 self::$db_duration_stat += (microtime(true) - $stamp);
 801
 802                                 while ($entry = DBA::fetch($jobs)) {
 803                                         $idle_workers -= $entry['running'];
 804                                         $listitem[$entry['priority']] = $entry['priority'] . ':' . $entry['running'];
 805                                 }
 806                                 DBA::close($jobs);
 807                         }
 808
 809                         $waiting_processes -= $deferred;
 810
 811                         $listitem[0] = '0:' . max(0, $idle_workers);
 812
 813                         $processlist .= ' ('.implode(', ', $listitem).')';
 814
 815                         if (DI::config()->get('system', 'worker_fastlane', false) && ($queues > 0) && ($active >= $queues) && self::entriesExists()) {
 816                                 $top_priority = self::highestPriority();
 817                                 $high_running = self::processWithPriorityActive($top_priority);
 818
 819                                 if (!$high_running && ($top_priority > self::PRIORITY_UNDEFINED) && ($top_priority < self::PRIORITY_NEGLIGIBLE)) {
 820                                         Logger::info('Jobs with a higher priority are waiting but none is executed. Open a fastlane.', ['priority' => $top_priority]);
 821                                         $queues = $active + 1;
 822                                 }
 823                         }
 824
 825                         Logger::info('Load: ' . $load . '/' . $maxsysload . ' - processes: ' . $deferred . '/' . $active . '/' . $waiting_processes . $processlist . ' - maximum: ' . $queues . '/' . $maxqueues);
 826
 827                         // Are there fewer workers running as possible? Then fork a new one.
 828                         if (!DI::config()->get('system', 'worker_dont_fork', false) && ($queues > ($active + 1)) && self::entriesExists() && !self::systemLimitReached()) {
 829                                 Logger::info('There are fewer workers as possible, fork a new worker.', ['active' => $active, 'queues' => $queues]);
 830                                 if (Worker\Daemon::isMode()) {
 831                                         Worker\IPC::SetJobState(true);
 832                                 } else {
 833                                         self::spawnWorker();
 834                                 }
 835                         }
 836                 }
 837
 838                 // if there are too much worker, we don't spawn a new one.
 839                 if (Worker\Daemon::isMode() && ($active > $queues)) {
 840                         Worker\IPC::SetJobState(false);
 841                 }
 842
 843                 return $active > $queues;
 844         }
 845
 846         /**
 847          * Returns the number of active worker processes
 848          *
 849          * @return integer Number of active worker processes
 850          * @throws \Exception
 851          */
 852         private static function activeWorkers(): int
 853         {
 854                 $stamp = (float)microtime(true);
 855                 $count = DI::process()->countCommand('Worker.php');
 856                 self::$db_duration += (microtime(true) - $stamp);
 857                 self::$db_duration_count += (microtime(true) - $stamp);
 858                 return $count;
 859         }
 860
 861         /**
 862          * Returns the number of active worker processes
 863          *
 864          * @return array List of worker process ids
 865          * @throws \Exception
 866          */
 867         private static function getWorkerPIDList(): array
 868         {
 869                 $ids = [];
 870                 $stamp = (float)microtime(true);
 871
 872                 $queues = DBA::p("SELECT `process`.`pid`, COUNT(`workerqueue`.`pid`) AS `entries` FROM `process`
 873                         LEFT JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `workerqueue`.`done`
 874                         GROUP BY `process`.`pid`");
 875                 while ($queue = DBA::fetch($queues)) {
 876                         $ids[$queue['pid']] = $queue['entries'];
 877                 }
 878                 DBA::close($queues);
 879
 880                 self::$db_duration += (microtime(true) - $stamp);
 881                 self::$db_duration_count += (microtime(true) - $stamp);
 882                 return $ids;
 883         }
 884
 885         /**
 886          * Returns waiting jobs for the current process id
 887          *
 888          * @return array|bool waiting workerqueue jobs or FALSE on failure
 889          * @throws \Exception
 890          */
 891         private static function getWaitingJobForPID()
 892         {
 893                 $stamp = (float)microtime(true);
 894                 $r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
 895                 self::$db_duration += (microtime(true) - $stamp);
 896                 if (DBA::isResult($r)) {
 897                         return DBA::toArray($r);
 898                 }
 899                 DBA::close($r);
 900
 901                 return false;
 902         }
 903
 904         /**
 905          * Returns the next jobs that should be executed
 906          * @param int $limit
 907          * @return array array with next jobs
 908          * @throws \Exception
 909          */
 910         private static function nextProcess(int $limit): array
 911         {
 912                 $priority = self::nextPriority();
 913                 if (empty($priority)) {
 914                         Logger::info('No tasks found');
 915                         return [];
 916                 }
 917
 918                 $ids = [];
 919                 $stamp = (float)microtime(true);
 920                 $condition = ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()];
 921                 $tasks = DBA::select('workerqueue', ['id', 'command', 'parameter'], $condition, ['limit' => $limit, 'order' => ['retrial', 'created']]);
 922                 self::$db_duration += (microtime(true) - $stamp);
 923                 while ($task = DBA::fetch($tasks)) {
 924                         $ids[] = $task['id'];
 925                         // Only continue that loop while we are storing commands that can be processed quickly
 926                         if (!empty($task['command'])) {
 927                                 $command = $task['command'];
 928                         } else {
 929                                 $command = json_decode($task['parameter'])[0];
 930                         }
 931
 932                         if (!in_array($command, self::FAST_COMMANDS)) {
 933                                 break;
 934                         }
 935                 }
 936                 DBA::close($tasks);
 937
 938                 Logger::info('Found:', ['priority' => $priority, 'id' => $ids]);
 939                 return $ids;
 940         }
 941
 942         /**
 943          * Returns the priority of the next workerqueue job
 944          *
 945          * @return string|bool priority or FALSE on failure
 946          * @throws \Exception
 947          */
 948         private static function nextPriority()
 949         {
 950                 $waiting = [];
 951                 $priorities = [self::PRIORITY_CRITICAL, self::PRIORITY_HIGH, self::PRIORITY_MEDIUM, self::PRIORITY_LOW, self::PRIORITY_NEGLIGIBLE];
 952                 foreach ($priorities as $priority) {
 953                         $stamp = (float)microtime(true);
 954                         if (DBA::exists('workerqueue', ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()])) {
 955                                 $waiting[$priority] = true;
 956                         }
 957                         self::$db_duration += (microtime(true) - $stamp);
 958                 }
 959
 960                 if (!empty($waiting[self::PRIORITY_CRITICAL])) {
 961                         return self::PRIORITY_CRITICAL;
 962                 }
 963
 964                 $running = [];
 965                 $running_total = 0;
 966                 $stamp = (float)microtime(true);
 967                 $processes = DBA::p("SELECT COUNT(DISTINCT(`pid`)) AS `running`, `priority` FROM `workerqueue-view` GROUP BY `priority`");
 968                 self::$db_duration += (microtime(true) - $stamp);
 969                 while ($process = DBA::fetch($processes)) {
 970                         $running[$process['priority']] = $process['running'];
 971                         $running_total += $process['running'];
 972                 }
 973                 DBA::close($processes);
 974
 975                 foreach ($priorities as $priority) {
 976                         if (!empty($waiting[$priority]) && empty($running[$priority])) {
 977                                 Logger::info('No running worker found with priority {priority} - assigning it.', ['priority' => $priority]);
 978                                 return $priority;
 979                         }
 980                 }
 981
 982                 $active = max(self::activeWorkers(), $running_total);
 983                 $priorities = max(count($waiting), count($running));
 984                 $exponent = 2;
 985
 986                 $total = 0;
 987                 for ($i = 1; $i <= $priorities; ++$i) {
 988                         $total += pow($i, $exponent);
 989                 }
 990
 991                 $limit = [];
 992                 for ($i = 1; $i <= $priorities; ++$i) {
 993                         $limit[$priorities - $i] = max(1, round($active * (pow($i, $exponent) / $total)));
 994                 }
 995
 996                 $i = 0;
 997                 foreach ($running as $priority => $workers) {
 998                         if ($workers < $limit[$i++]) {
 999                                 Logger::info('Priority {priority} has got {workers} workers out of a limit of {limit}', ['priority' => $priority, 'workers' => $workers, 'limit' => $limit[$i - 1]]);
1000                                 return $priority;
1001                         }
1002                 }
1003
1004                 if (!empty($waiting)) {
1005                         $priority = array_keys($waiting)[0];
1006                         Logger::info('No underassigned priority found, now taking the highest priority.', ['priority' => $priority]);
1007                         return $priority;
1008                 }
1009
1010                 return false;
1011         }
1012
1013         /**
1014          * Find and claim the next worker process for us
1015          *
1016          * @return void
1017          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1018          */
1019         private static function findWorkerProcesses()
1020         {
1021                 $fetch_limit = DI::config()->get('system', 'worker_fetch_limit', 1);
1022
1023                 if (DI::config()->get('system', 'worker_multiple_fetch')) {
1024                         $pids = [];
1025                         foreach (self::getWorkerPIDList() as $pid => $count) {
1026                                 if ($count <= $fetch_limit) {
1027                                         $pids[] = $pid;
1028                                 }
1029                         }
1030                         if (empty($pids)) {
1031                                 return;
1032                         }
1033                         $limit = $fetch_limit * count($pids);
1034                 } else {
1035                         $pids = [getmypid()];
1036                         $limit = $fetch_limit;
1037                 }
1038
1039                 $ids = self::nextProcess($limit);
1040                 $limit -= count($ids);
1041
1042                 // If there is not enough results we check without priority limit
1043                 if ($limit > 0) {
1044                         $stamp = (float)microtime(true);
1045                         $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
1046                         $tasks = DBA::select('workerqueue', ['id', 'command', 'parameter'], $condition, ['limit' => $limit, 'order' => ['priority', 'retrial', 'created']]);
1047                         self::$db_duration += (microtime(true) - $stamp);
1048
1049                         while ($task = DBA::fetch($tasks)) {
1050                                 $ids[] = $task['id'];
1051                                 // Only continue that loop while we are storing commands that can be processed quickly
1052                                 if (!empty($task['command'])) {
1053                                         $command = $task['command'];
1054                                 } else {
1055                                         $command = json_decode($task['parameter'])[0];
1056                                 }
1057                                 if (!in_array($command, self::FAST_COMMANDS)) {
1058                                         break;
1059                                 }
1060                         }
1061                         DBA::close($tasks);
1062                 }
1063
1064                 if (empty($ids)) {
1065                         return;
1066                 }
1067
1068                 // Assign the task ids to the workers
1069                 $worker = [];
1070                 foreach (array_unique($ids) as $id) {
1071                         $pid = next($pids);
1072                         if (!$pid) {
1073                                 $pid = reset($pids);
1074                         }
1075                         $worker[$pid][] = $id;
1076                 }
1077
1078                 $stamp = (float)microtime(true);
1079                 foreach ($worker as $worker_pid => $worker_ids) {
1080                         Logger::info('Set queue entry', ['pid' => $worker_pid, 'ids' => $worker_ids]);
1081                         DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $worker_pid],
1082                                 ['id' => $worker_ids, 'done' => false, 'pid' => 0]);
1083                 }
1084                 self::$db_duration += (microtime(true) - $stamp);
1085                 self::$db_duration_write += (microtime(true) - $stamp);
1086         }
1087
1088         /**
1089          * Returns the next worker process
1090          *
1091          * @return array worker processes
1092          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1093          */
1094         public static function workerProcess(): array
1095         {
1096                 // There can already be jobs for us in the queue.
1097                 $waiting = self::getWaitingJobForPID();
1098                 if (!empty($waiting)) {
1099                         return $waiting;
1100                 }
1101
1102                 $stamp = (float)microtime(true);
1103                 if (!DI::lock()->acquire(self::LOCK_PROCESS)) {
1104                         return [];
1105                 }
1106                 self::$lock_duration += (microtime(true) - $stamp);
1107
1108                 self::findWorkerProcesses();
1109
1110                 DI::lock()->release(self::LOCK_PROCESS);
1111
1112                 // Prevents "Return value of Friendica\Core\Worker::workerProcess() must be of the type array, bool returned"
1113                 $process = self::getWaitingJobForPID();
1114                 return (is_array($process) ? $process : []);
1115         }
1116
1117         /**
1118          * Removes a workerqueue entry from the current process
1119          *
1120          * @param Process $process the process behind the workerqueue
1121          *
1122          * @return void
1123          * @throws \Exception
1124          */
1125         public static function unclaimProcess(Process $process)
1126         {
1127                 $stamp = (float)microtime(true);
1128                 DBA::update('workerqueue', ['executed' => DBA::NULL_DATETIME, 'pid' => 0], ['pid' => $process->pid, 'done' => false]);
1129                 self::$db_duration += (microtime(true) - $stamp);
1130                 self::$db_duration_write += (microtime(true) - $stamp);
1131         }
1132
1133         /**
1134          * Fork a child process
1135          *
1136          * @param boolean $do_cron
1137          * @return void
1138          */
1139         private static function forkProcess(bool $do_cron)
1140         {
1141                 if (DI::system()->isMinMemoryReached()) {
1142                         Logger::warning('Memory limit reached - quitting');
1143                         return;
1144                 }
1145
1146                 // Children inherit their parent's database connection.
1147                 // To avoid problems we disconnect and connect both parent and child
1148                 DBA::disconnect();
1149                 $pid = pcntl_fork();
1150                 if ($pid == -1) {
1151                         DBA::connect();
1152                         Logger::warning('Could not spawn worker');
1153                         return;
1154                 } elseif ($pid) {
1155                         // The parent process continues here
1156                         DBA::connect();
1157
1158                         Worker\IPC::SetJobState(true, $pid);
1159                         Logger::info('Spawned new worker', ['pid' => $pid]);
1160
1161                         $cycles = 0;
1162                         while (Worker\IPC::JobsExists($pid) && (++$cycles < 100)) {
1163                                 usleep(10000);
1164                         }
1165
1166                         Logger::info('Spawned worker is ready', ['pid' => $pid, 'wait_cycles' => $cycles]);
1167                         return;
1168                 }
1169
1170                 // We now are in the new worker
1171                 DBA::connect();
1172
1173                 DI::flushLogger();
1174                 $process = DI::process()->create(getmypid(), basename(__FILE__));
1175
1176                 $cycles = 0;
1177                 while (!Worker\IPC::JobsExists($process->pid) && (++$cycles < 100)) {
1178                         usleep(10000);
1179                 }
1180
1181                 Logger::info('Worker spawned', ['pid' => $process->pid, 'wait_cycles' => $cycles]);
1182
1183                 self::processQueue($do_cron, $process);
1184
1185                 self::unclaimProcess($process);
1186
1187                 Worker\IPC::SetJobState(false, $process->pid);
1188                 DI::process()->delete($process);
1189                 Logger::info('Worker ended', ['pid' => $process->pid]);
1190                 exit();
1191         }
1192
1193         /**
1194          * Spawns a new worker
1195          *
1196          * @param bool $do_cron
1197          * @return void
1198          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1199          */
1200         public static function spawnWorker(bool $do_cron = false)
1201         {
1202                 if (Worker\Daemon::isMode() && DI::config()->get('system', 'worker_fork')) {
1203                         self::forkProcess($do_cron);
1204                 } else {
1205                         DI::system()->run('bin/worker.php', ['no_cron' => !$do_cron]);
1206                 }
1207                 if (Worker\Daemon::isMode()) {
1208                         Worker\IPC::SetJobState(false);
1209                 }
1210         }
1211
1212         /**
1213          * Adds tasks to the worker queue
1214          *
1215          * @param (integer|array) priority or parameter array, strings are deprecated and are ignored
1216          *
1217          * next args are passed as $cmd command line
1218          * or: Worker::add(Worker::PRIORITY_HIGH, 'Notifier', Delivery::DELETION, $drop_id);
1219          * or: Worker::add(array('priority' => Worker::PRIORITY_HIGH, 'dont_fork' => true), 'Delivery', $post_id);
1220          *
1221          * @return int '0' if worker queue entry already existed or there had been an error, otherwise the ID of the worker task
1222          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1223          * @note $cmd and string args are surrounded with ''
1224          *
1225          * @hooks 'proc_run'
1226          *    array $arr
1227          *
1228          */
1229         public static function add(...$args)
1230         {
1231                 if (!count($args)) {
1232                         return 0;
1233                 }
1234
1235                 $arr = ['args' => $args, 'run_cmd' => true];
1236
1237                 Hook::callAll('proc_run', $arr);
1238                 if (!$arr['run_cmd'] || !count($args)) {
1239                         return 1;
1240                 }
1241
1242                 $priority = self::PRIORITY_MEDIUM;
1243                 // Don't fork from frontend tasks by default
1244                 $dont_fork = DI::config()->get('system', 'worker_dont_fork', false) || !DI::mode()->isBackend();
1245                 $created = DateTimeFormat::utcNow();
1246                 $delayed = DBA::NULL_DATETIME;
1247                 $force_priority = false;
1248
1249                 $run_parameter = array_shift($args);
1250
1251                 if (is_int($run_parameter)) {
1252                         $priority = $run_parameter;
1253                 } elseif (is_array($run_parameter)) {
1254                         if (isset($run_parameter['delayed'])) {
1255                                 $delayed = $run_parameter['delayed'];
1256                         }
1257                         if (isset($run_parameter['priority'])) {
1258                                 $priority = $run_parameter['priority'];
1259                         }
1260                         if (isset($run_parameter['created'])) {
1261                                 $created = $run_parameter['created'];
1262                         }
1263                         if (isset($run_parameter['dont_fork'])) {
1264                                 $dont_fork = $run_parameter['dont_fork'];
1265                         }
1266                         if (isset($run_parameter['force_priority'])) {
1267                                 $force_priority = $run_parameter['force_priority'];
1268                         }
1269                 } else {
1270                         throw new \InvalidArgumentException('Priority number or task parameter array expected as first argument');
1271                 }
1272
1273                 $command = array_shift($args);
1274                 $parameters = json_encode($args);
1275                 $queue = DBA::selectFirst('workerqueue', ['id', 'priority'], ['command' => $command, 'parameter' => $parameters, 'done' => false]);
1276                 $added = 0;
1277
1278                 if (!is_int($priority) || !in_array($priority, self::PRIORITIES)) {
1279                         Logger::warning('Invalid priority', ['priority' => $priority, 'command' => $command]);
1280                         $priority = self::PRIORITY_MEDIUM;
1281                 }
1282
1283                 // Quit if there was a database error - a precaution for the update process to 3.5.3
1284                 if (DBA::errorNo() != 0) {
1285                         return 0;
1286                 }
1287
1288                 if (empty($queue)) {
1289                         if (!DBA::insert('workerqueue', ['command' => $command, 'parameter' => $parameters, 'created' => $created,
1290                                 'priority' => $priority, 'next_try' => $delayed])) {
1291                                 return 0;
1292                         }
1293                         $added = DBA::lastInsertId();
1294                 } elseif ($force_priority) {
1295                         $ret = DBA::update('workerqueue', ['priority' => $priority], ['command' => $command, 'parameter' => $parameters, 'done' => false, 'pid' => 0]);
1296                         if ($ret && ($priority != $queue['priority'])) {
1297                                 $added = $queue['id'];
1298                         }
1299                 }
1300
1301                 // Set the IPC flag to ensure an immediate process execution via daemon
1302                 if (Worker\Daemon::isMode()) {
1303                         Worker\IPC::SetJobState(true);
1304                 }
1305
1306                 Worker\Daemon::checkState();
1307
1308                 // Should we quit and wait for the worker to be called as a cronjob?
1309                 if ($dont_fork || self::systemLimitReached()) {
1310                         return $added;
1311                 }
1312
1313                 // If there is a lock then we don't have to check for too much worker
1314                 if (!DI::lock()->acquire(self::LOCK_WORKER, 0)) {
1315                         return $added;
1316                 }
1317
1318                 // If there are already enough workers running, don't fork another one
1319                 $quit = self::tooMuchWorkers();
1320                 DI::lock()->release(self::LOCK_WORKER);
1321
1322                 if ($quit) {
1323                         return $added;
1324                 }
1325
1326                 // Quit on daemon mode, except the priority is critical (like for db updates)
1327                 if (Worker\Daemon::isMode() && $priority !== self::PRIORITY_CRITICAL) {
1328                         return $added;
1329                 }
1330
1331                 // Now call the worker to execute the jobs that we just added to the queue
1332                 self::spawnWorker();
1333
1334                 return $added;
1335         }
1336
1337         public static function countWorkersByCommand(string $command): int
1338         {
1339                 return DBA::count('workerqueue', ['done' => false, 'pid' => 0, 'command' => $command]);
1340         }
1341
1342         /**
1343          * Returns the next retrial level for worker jobs.
1344          * This function will skip levels when jobs are older.
1345          *
1346          * @param array $queue Worker queue entry
1347          * @param integer $max_level maximum retrial level
1348          * @return integer the next retrial level value
1349          */
1350         private static function getNextRetrial(array $queue, int $max_level): int
1351         {
1352                 $created = strtotime($queue['created']);
1353                 $retrial_time = time() - $created;
1354
1355                 $new_retrial = $queue['retrial'] + 1;
1356                 $total = 0;
1357                 for ($retrial = 0; $retrial <= $max_level + 1; ++$retrial) {
1358                         $delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
1359                         $total += $delay;
1360                         if (($total < $retrial_time) && ($retrial > $queue['retrial'])) {
1361                                 $new_retrial = $retrial;
1362                         }
1363                 }
1364                 Logger::notice('New retrial for task', ['id' => $queue['id'], 'created' => $queue['created'], 'old' => $queue['retrial'], 'new' => $new_retrial]);
1365                 return $new_retrial;
1366         }
1367
1368         /**
1369          * Get the number of retrials for the current worker task
1370          *
1371          * @return integer
1372          */
1373         public static function getRetrial(): int
1374         {
1375                 $queue = DI::app()->getQueue();
1376                 return $queue['retrial'] ?? 0;
1377         }
1378
1379         /**
1380          * Defers the current worker entry
1381          *
1382          * @param int $worker_defer_limit Maximum defer limit
1383          * @return boolean had the entry been deferred?
1384          * @throws \Exception
1385          */
1386         public static function defer(int $worker_defer_limit = 0): bool
1387         {
1388                 $queue = DI::app()->getQueue();
1389
1390                 if (empty($queue)) {
1391                         return false;
1392                 }
1393
1394                 $id = $queue['id'];
1395                 $priority = $queue['priority'];
1396
1397                 $max_level = DI::config()->get('system', 'worker_defer_limit');
1398
1399                 if ($worker_defer_limit) {
1400                         $max_level = min($worker_defer_limit, $max_level);
1401                 }
1402
1403                 $new_retrial = self::getNextRetrial($queue, $max_level);
1404
1405                 if ($new_retrial > $max_level) {
1406                         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]);
1407                         return false;
1408                 }
1409
1410                 // Calculate the delay until the next trial
1411                 $delay = (($new_retrial + 2) ** 4) + (rand(1, 30) * ($new_retrial));
1412                 $next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
1413
1414                 if (($priority < self::PRIORITY_MEDIUM) && ($new_retrial > 3)) {
1415                         $priority = self::PRIORITY_MEDIUM;
1416                 } elseif (($priority < self::PRIORITY_LOW) && ($new_retrial > 6)) {
1417                         $priority = self::PRIORITY_LOW;
1418                 } elseif (($priority < self::PRIORITY_NEGLIGIBLE) && ($new_retrial > 8)) {
1419                         $priority = self::PRIORITY_NEGLIGIBLE;
1420                 }
1421
1422                 Logger::info('Deferred task', ['id' => $id, 'retrial' => $new_retrial, 'created' => $queue['created'], 'next_execution' => $next, 'old_prio' => $queue['priority'], 'new_prio' => $priority]);
1423
1424                 $stamp = (float)microtime(true);
1425                 $fields = ['retrial' => $new_retrial, 'next_try' => $next, 'executed' => DBA::NULL_DATETIME, 'pid' => 0, 'priority' => $priority];
1426                 DBA::update('workerqueue', $fields, ['id' => $id]);
1427                 self::$db_duration += (microtime(true) - $stamp);
1428                 self::$db_duration_write += (microtime(true) - $stamp);
1429
1430                 return true;
1431         }
1432
1433         /**
1434          * Check if the system is inside the defined maintenance window
1435          *
1436          * @param bool $check_last_execution Whether check last execution
1437          * @return boolean
1438          */
1439         public static function isInMaintenanceWindow(bool $check_last_execution = false): bool
1440         {
1441                 // Calculate the seconds of the start and end of the maintenance window
1442                 $start = strtotime(DI::config()->get('system', 'maintenance_start')) % 86400;
1443                 $end = strtotime(DI::config()->get('system', 'maintenance_end')) % 86400;
1444
1445                 Logger::info('Maintenance window', ['start' => date('H:i:s', $start), 'end' => date('H:i:s', $end)]);
1446
1447                 if ($check_last_execution) {
1448                         // Calculate the window duration
1449                         $duration = max($start, $end) - min($start, $end);
1450
1451                         // Quit when the last cron execution had been after the previous window
1452                         $last_cron = DI::keyValue()->get('last_cron_daily');
1453                         if ($last_cron + $duration > time()) {
1454                                 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)]);
1455                                 return false;
1456                         }
1457                 }
1458
1459                 $current = time() % 86400;
1460
1461                 if ($start < $end) {
1462                         // Execute if we are inside the window
1463                         $execute = ($current >= $start) && ($current <= $end);
1464                 } else {
1465                         // Don't execute if we are outside the window
1466                         $execute = !(($current > $end) && ($current < $start));
1467                 }
1468
1469                 if ($execute) {
1470                         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)]);
1471                 } else {
1472                         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)]);
1473                 }
1474
1475                 return $execute;
1476         }
1477 }