src/Core/Worker.php

   1 <?php
   2 /**
   3  * @file src/Core/Worker.php
   4  */
   5 namespace Friendica\Core;
   6
   7 use Friendica\BaseObject;
   8 use Friendica\Database\DBA;
   9 use Friendica\Model\Process;
  10 use Friendica\Util\DateTimeFormat;
  11 use Friendica\Util\Logger\WorkerLogger;
  12 use Friendica\Util\Network;
  13
  14 /**
  15  * @file src/Core/Worker.php
  16  *
  17  * @brief Contains the class for the worker background job processing
  18  */
  19
  20 /**
  21  * @brief Worker methods
  22  */
  23 class Worker
  24 {
  25         const STATE_STARTUP    = 1;
  26         const STATE_SHORT_LOOP = 2;
  27         const STATE_REFETCH    = 3;
  28         const STATE_LONG_LOOP  = 4;
  29
  30         private static $up_start;
  31         private static $db_duration = 0;
  32         private static $db_duration_count = 0;
  33         private static $db_duration_write = 0;
  34         private static $db_duration_stat = 0;
  35         private static $lock_duration = 0;
  36         private static $last_update;
  37         private static $state;
  38
  39         /**
  40          * @brief Processes the tasks that are in the workerqueue table
  41          *
  42          * @param boolean $run_cron Should the cron processes be executed?
  43          * @return void
  44          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
  45          */
  46         public static function processQueue($run_cron = true)
  47         {
  48                 $a = \get_app();
  49
  50                 // Ensure that all "strtotime" operations do run timezone independent
  51                 date_default_timezone_set('UTC');
  52
  53                 self::$up_start = microtime(true);
  54
  55                 // At first check the maximum load. We shouldn't continue with a high load
  56                 if ($a->isMaxLoadReached()) {
  57                         Logger::log('Pre check: maximum load reached, quitting.', Logger::DEBUG);
  58                         return;
  59                 }
  60
  61                 // We now start the process. This is done after the load check since this could increase the load.
  62                 self::startProcess();
  63
  64                 // Kill stale processes every 5 minutes
  65                 $last_cleanup = Config::get('system', 'worker_last_cleaned', 0);
  66                 if (time() > ($last_cleanup + 300)) {
  67                         Config::set('system', 'worker_last_cleaned', time());
  68                         self::killStaleWorkers();
  69                 }
  70
  71                 // Count active workers and compare them with a maximum value that depends on the load
  72                 if (self::tooMuchWorkers()) {
  73                         Logger::log('Pre check: Active worker limit reached, quitting.', Logger::DEBUG);
  74                         return;
  75                 }
  76
  77                 // Do we have too few memory?
  78                 if ($a->isMinMemoryReached()) {
  79                         Logger::log('Pre check: Memory limit reached, quitting.', Logger::DEBUG);
  80                         return;
  81                 }
  82
  83                 // Possibly there are too much database connections
  84                 if (self::maxConnectionsReached()) {
  85                         Logger::log('Pre check: maximum connections reached, quitting.', Logger::DEBUG);
  86                         return;
  87                 }
  88
  89                 // Possibly there are too much database processes that block the system
  90                 if ($a->isMaxProcessesReached()) {
  91                         Logger::log('Pre check: maximum processes reached, quitting.', Logger::DEBUG);
  92                         return;
  93                 }
  94
  95                 // Now we start additional cron processes if we should do so
  96                 if ($run_cron) {
  97                         self::runCron();
  98                 }
  99
 100                 $starttime = time();
 101                 self::$state = self::STATE_STARTUP;
 102
 103                 // We fetch the next queue entry that is about to be executed
 104                 while ($r = self::workerProcess()) {
 105                         foreach ($r as $entry) {
 106                                 // Assure that the priority is an integer value
 107                                 $entry['priority'] = (int)$entry['priority'];
 108
 109                                 // The work will be done
 110                                 if (!self::execute($entry)) {
 111                                         Logger::log('Process execution failed, quitting.', Logger::DEBUG);
 112                                         return;
 113                                 }
 114
 115                                 // If possible we will fetch new jobs for this worker
 116                                 if (!self::getWaitingJobForPID() && Lock::acquire('worker_process', 0)) {
 117                                         self::findWorkerProcesses();
 118                                         Lock::release('worker_process');
 119                                         self::$state = self::STATE_REFETCH;
 120                                 }
 121                         }
 122
 123                         if (self::$state != self::STATE_REFETCH) {
 124                                 self::$state = self::STATE_LONG_LOOP;
 125                         }
 126
 127                         // To avoid the quitting of multiple workers only one worker at a time will execute the check
 128                         if (Lock::acquire('worker', 0)) {
 129                                 // Count active workers and compare them with a maximum value that depends on the load
 130                                 if (self::tooMuchWorkers()) {
 131                                         Logger::log('Active worker limit reached, quitting.', Logger::DEBUG);
 132                                         Lock::release('worker');
 133                                         return;
 134                                 }
 135
 136                                 // Check free memory
 137                                 if ($a->isMinMemoryReached()) {
 138                                         Logger::log('Memory limit reached, quitting.', Logger::DEBUG);
 139                                         Lock::release('worker');
 140                                         return;
 141                                 }
 142                                 Lock::release('worker');
 143                         }
 144
 145                         // Quit the worker once every cron interval
 146                         if (time() > ($starttime + Config::get('system', 'cron_interval'))) {
 147                                 Logger::log('Process lifetime reached, respawning.', Logger::DEBUG);
 148                                 self::spawnWorker();
 149                                 return;
 150                         }
 151                 }
 152
 153                 // Cleaning up. Possibly not needed, but it doesn't harm anything.
 154                 if (Config::get('system', 'worker_daemon_mode', false)) {
 155                         self::IPCSetJobState(false);
 156                 }
 157                 Logger::log("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", Logger::DEBUG);
 158         }
 159
 160         /**
 161          * @brief Check if non executed tasks do exist in the worker queue
 162          *
 163          * @return boolean Returns "true" if tasks are existing
 164          * @throws \Exception
 165          */
 166         private static function entriesExists()
 167         {
 168                 $stamp = (float)microtime(true);
 169                 $exists = DBA::exists('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` < ?", DateTimeFormat::utcNow()]);
 170                 self::$db_duration += (microtime(true) - $stamp);
 171                 return $exists;
 172         }
 173
 174         /**
 175          * @brief Returns the number of deferred entries in the worker queue
 176          *
 177          * @return integer Number of deferred entries in the worker queue
 178          * @throws \Exception
 179          */
 180         private static function deferredEntries()
 181         {
 182                 $stamp = (float)microtime(true);
 183                 $count = DBA::count('workerqueue', ["NOT `done` AND `pid` = 0 AND `next_try` > ?", DateTimeFormat::utcNow()]);
 184                 self::$db_duration += (microtime(true) - $stamp);
 185                 self::$db_duration_count += (microtime(true) - $stamp);
 186                 return $count;
 187         }
 188
 189         /**
 190          * @brief Returns the number of non executed entries in the worker queue
 191          *
 192          * @return integer Number of non executed entries in the worker queue
 193          * @throws \Exception
 194          */
 195         private static function totalEntries()
 196         {
 197                 $stamp = (float)microtime(true);
 198                 $count = DBA::count('workerqueue', ['done' => false, 'pid' => 0]);
 199                 self::$db_duration += (microtime(true) - $stamp);
 200                 self::$db_duration_count += (microtime(true) - $stamp);
 201                 return $count;
 202         }
 203
 204         /**
 205          * @brief Returns the highest priority in the worker queue that isn't executed
 206          *
 207          * @return integer Number of active worker processes
 208          * @throws \Exception
 209          */
 210         private static function highestPriority()
 211         {
 212                 $stamp = (float)microtime(true);
 213                 $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
 214                 $workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
 215                 self::$db_duration += (microtime(true) - $stamp);
 216                 if (DBA::isResult($workerqueue)) {
 217                         return $workerqueue["priority"];
 218                 } else {
 219                         return 0;
 220                 }
 221         }
 222
 223         /**
 224          * @brief Returns if a process with the given priority is running
 225          *
 226          * @param integer $priority The priority that should be checked
 227          *
 228          * @return integer Is there a process running with that priority?
 229          * @throws \Exception
 230          */
 231         private static function processWithPriorityActive($priority)
 232         {
 233                 $condition = ["`priority` <= ? AND `pid` != 0 AND NOT `done`", $priority];
 234                 return DBA::exists('workerqueue', $condition);
 235         }
 236
 237         /**
 238          * @brief Execute a worker entry
 239          *
 240          * @param array $queue Workerqueue entry
 241          *
 242          * @return boolean "true" if further processing should be stopped
 243          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 244          */
 245         public static function execute($queue)
 246         {
 247                 $a = \get_app();
 248
 249                 $mypid = getmypid();
 250
 251                 // Quit when in maintenance
 252                 if (Config::get('system', 'maintenance', false, true)) {
 253                         Logger::log("Maintenance mode - quit process ".$mypid, Logger::DEBUG);
 254                         return false;
 255                 }
 256
 257                 // Constantly check the number of parallel database processes
 258                 if ($a->isMaxProcessesReached()) {
 259                         Logger::log("Max processes reached for process ".$mypid, Logger::DEBUG);
 260                         return false;
 261                 }
 262
 263                 // Constantly check the number of available database connections to let the frontend be accessible at any time
 264                 if (self::maxConnectionsReached()) {
 265                         Logger::log("Max connection reached for process ".$mypid, Logger::DEBUG);
 266                         return false;
 267                 }
 268
 269                 $argv = json_decode($queue["parameter"], true);
 270
 271                 // Check for existance and validity of the include file
 272                 $include = $argv[0];
 273
 274                 if (method_exists(sprintf('Friendica\Worker\%s', $include), 'execute')) {
 275                         // We constantly update the "executed" date every minute to avoid being killed too soon
 276                         if (!isset(self::$last_update)) {
 277                                 self::$last_update = strtotime($queue["executed"]);
 278                         }
 279
 280                         $age = (time() - self::$last_update) / 60;
 281                         self::$last_update = time();
 282
 283                         if ($age > 1) {
 284                                 $stamp = (float)microtime(true);
 285                                 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 286                                 self::$db_duration += (microtime(true) - $stamp);
 287                                 self::$db_duration_write += (microtime(true) - $stamp);
 288                         }
 289
 290                         array_shift($argv);
 291
 292                         self::execFunction($queue, $include, $argv, true);
 293
 294                         $stamp = (float)microtime(true);
 295                         $condition = ["`id` = ? AND `next_try` < ?", $queue['id'], DateTimeFormat::utcNow()];
 296                         if (DBA::update('workerqueue', ['done' => true], $condition)) {
 297                                 Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 298                         }
 299                         self::$db_duration = (microtime(true) - $stamp);
 300                         self::$db_duration_write += (microtime(true) - $stamp);
 301
 302                         return true;
 303                 }
 304
 305                 // The script could be provided as full path or only with the function name
 306                 if ($include == basename($include)) {
 307                         $include = "include/".$include.".php";
 308                 }
 309
 310                 if (!validate_include($include)) {
 311                         Logger::log("Include file ".$argv[0]." is not valid!");
 312                         $stamp = (float)microtime(true);
 313                         DBA::delete('workerqueue', ['id' => $queue["id"]]);
 314                         self::$db_duration = (microtime(true) - $stamp);
 315                         self::$db_duration_write += (microtime(true) - $stamp);
 316                         return true;
 317                 }
 318
 319                 require_once $include;
 320
 321                 $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 322
 323                 if (function_exists($funcname)) {
 324                         // We constantly update the "executed" date every minute to avoid being killed too soon
 325                         if (!isset(self::$last_update)) {
 326                                 self::$last_update = strtotime($queue["executed"]);
 327                         }
 328
 329                         $age = (time() - self::$last_update) / 60;
 330                         self::$last_update = time();
 331
 332                         if ($age > 1) {
 333                                 $stamp = (float)microtime(true);
 334                                 DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 335                                 self::$db_duration += (microtime(true) - $stamp);
 336                                 self::$db_duration_write += (microtime(true) - $stamp);
 337                         }
 338
 339                         self::execFunction($queue, $funcname, $argv, false);
 340
 341                         $stamp = (float)microtime(true);
 342                         if (DBA::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
 343                                 Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 344                         }
 345                         self::$db_duration = (microtime(true) - $stamp);
 346                         self::$db_duration_write += (microtime(true) - $stamp);
 347                 } else {
 348                         Logger::log("Function ".$funcname." does not exist");
 349                         $stamp = (float)microtime(true);
 350                         DBA::delete('workerqueue', ['id' => $queue["id"]]);
 351                         self::$db_duration = (microtime(true) - $stamp);
 352                         self::$db_duration_write += (microtime(true) - $stamp);
 353                 }
 354
 355                 return true;
 356         }
 357
 358         /**
 359          * @brief Execute a function from the queue
 360          *
 361          * @param array   $queue       Workerqueue entry
 362          * @param string  $funcname    name of the function
 363          * @param array   $argv        Array of values to be passed to the function
 364          * @param boolean $method_call boolean
 365          * @return void
 366          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 367          */
 368         private static function execFunction($queue, $funcname, $argv, $method_call)
 369         {
 370                 $a = \get_app();
 371
 372                 $argc = count($argv);
 373
 374                 $logger = $a->getLogger();
 375                 $workerLogger = new WorkerLogger($logger, $funcname);
 376
 377                 $workerLogger ->info("Process start.", ['priority' => $queue["priority"], 'id' => $queue["id"]]);
 378
 379                 $stamp = (float)microtime(true);
 380
 381                 // We use the callstack here to analyze the performance of executed worker entries.
 382                 // For this reason the variables have to be initialized.
 383                 $a->getProfiler()->reset();
 384
 385                 $a->queue = $queue;
 386
 387                 $up_duration = microtime(true) - self::$up_start;
 388
 389                 // Reset global data to avoid interferences
 390                 unset($_SESSION);
 391
 392                 // Set the workerLogger as new default logger
 393                 Logger::init($workerLogger);
 394                 if ($method_call) {
 395                         call_user_func_array(sprintf('Friendica\Worker\%s::execute', $funcname), $argv);
 396                 } else {
 397                         $funcname($argv, $argc);
 398                 }
 399                 Logger::init($logger);
 400
 401                 unset($a->queue);
 402
 403                 $duration = (microtime(true) - $stamp);
 404
 405                 /* With these values we can analyze how effective the worker is.
 406                  * The database and rest time should be low since this is the unproductive time.
 407                  * The execution time is the productive time.
 408                  * By changing parameters like the maximum number of workers we can check the effectivness.
 409                 */
 410                 $dbtotal = round(self::$db_duration, 2);
 411                 $dbread  = round(self::$db_duration - (self::$db_duration_count + self::$db_duration_write + self::$db_duration_stat), 2);
 412                 $dbcount = round(self::$db_duration_count, 2);
 413                 $dbstat  = round(self::$db_duration_stat, 2);
 414                 $dbwrite = round(self::$db_duration_write, 2);
 415                 $dblock  = round(self::$lock_duration, 2);
 416                 $rest    = round(max(0, $up_duration - (self::$db_duration + self::$lock_duration)), 2);
 417                 $exec    = round($duration, 2);
 418
 419                 $logger->info('Performance log.', ['state' => self::$state, 'count' => $dbcount, 'stat' => $dbstat, 'write' => $dbwrite, 'lock' => $dblock, 'total' => $dbtotal, 'rest' => $rest, 'exec' => $exec]);
 420
 421                 self::$up_start = microtime(true);
 422                 self::$db_duration = 0;
 423                 self::$db_duration_count = 0;
 424                 self::$db_duration_stat = 0;
 425                 self::$db_duration_write = 0;
 426                 self::$lock_duration = 0;
 427                 self::$state = self::STATE_SHORT_LOOP;
 428
 429                 if ($duration > 3600) {
 430                         $logger->info('Longer than 1 hour.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' =>   round($duration/60, 3)]);
 431                 } elseif ($duration > 600) {
 432                         $logger->info('Longer than 10 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' =>   round($duration/60, 3)]);
 433                 } elseif ($duration > 300) {
 434                         $logger->info('Longer than 5 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' =>   round($duration/60, 3)]);
 435                 } elseif ($duration > 120) {
 436                         $logger->info('Longer than 2 minutes.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' =>   round($duration/60, 3)]);
 437                 }
 438
 439                 $workerLogger->info('Process done. ', ['priority' => $queue["priority"], 'id' => $queue["id"], 'duration' =>   number_format($duration, 4)]);
 440
 441                 $a->getProfiler()->saveLog($a->getLogger(), "ID " . $queue["id"] . ": " . $funcname);
 442
 443                 $cooldown = Config::get("system", "worker_cooldown", 0);
 444
 445                 if ($cooldown > 0) {
 446                         $logger->info('Cooldown.', ['priority' => $queue["priority"], 'id' => $queue["id"], 'cooldown' => $cooldown]);
 447                         sleep($cooldown);
 448                 }
 449         }
 450
 451         /**
 452          * @brief Checks if the number of database connections has reached a critical limit.
 453          *
 454          * @return bool Are more than 3/4 of the maximum connections used?
 455          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 456          */
 457         private static function maxConnectionsReached()
 458         {
 459                 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 460                 $max = Config::get("system", "max_connections");
 461
 462                 // Fetch the percentage level where the worker will get active
 463                 $maxlevel = Config::get("system", "max_connections_level", 75);
 464
 465                 if ($max == 0) {
 466                         // the maximum number of possible user connections can be a system variable
 467                         $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 468                         if (DBA::isResult($r)) {
 469                                 $max = $r["Value"];
 470                         }
 471                         // Or it can be granted. This overrides the system variable
 472                         $stamp = (float)microtime(true);
 473                         $r = DBA::p('SHOW GRANTS');
 474                         self::$db_duration += (microtime(true) - $stamp);
 475                         while ($grants = DBA::fetch($r)) {
 476                                 $grant = array_pop($grants);
 477                                 if (stristr($grant, "GRANT USAGE ON")) {
 478                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
 479                                                 $max = $match[1];
 480                                         }
 481                                 }
 482                         }
 483                         DBA::close($r);
 484                 }
 485
 486                 // If $max is set we will use the processlist to determine the current number of connections
 487                 // The processlist only shows entries of the current user
 488                 if ($max != 0) {
 489                         $stamp = (float)microtime(true);
 490                         $r = DBA::p('SHOW PROCESSLIST');
 491                         self::$db_duration += (microtime(true) - $stamp);
 492                         $used = DBA::numRows($r);
 493                         DBA::close($r);
 494
 495                         Logger::log("Connection usage (user values): ".$used."/".$max, Logger::DEBUG);
 496
 497                         $level = ($used / $max) * 100;
 498
 499                         if ($level >= $maxlevel) {
 500                                 Logger::log("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 501                                 return true;
 502                         }
 503                 }
 504
 505                 // We will now check for the system values.
 506                 // This limit could be reached although the user limits are fine.
 507                 $r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 508                 if (!DBA::isResult($r)) {
 509                         return false;
 510                 }
 511                 $max = intval($r["Value"]);
 512                 if ($max == 0) {
 513                         return false;
 514                 }
 515                 $r = DBA::fetchFirst("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 516                 if (!DBA::isResult($r)) {
 517                         return false;
 518                 }
 519                 $used = intval($r["Value"]);
 520                 if ($used == 0) {
 521                         return false;
 522                 }
 523                 Logger::log("Connection usage (system values): ".$used."/".$max, Logger::DEBUG);
 524
 525                 $level = $used / $max * 100;
 526
 527                 if ($level < $maxlevel) {
 528                         return false;
 529                 }
 530                 Logger::log("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 531                 return true;
 532         }
 533
 534         /**
 535          * @brief fix the queue entry if the worker process died
 536          * @return void
 537          * @throws \Exception
 538          */
 539         private static function killStaleWorkers()
 540         {
 541                 $stamp = (float)microtime(true);
 542                 $entries = DBA::select(
 543                         'workerqueue',
 544                         ['id', 'pid', 'executed', 'priority', 'parameter'],
 545                         ['NOT `done` AND `pid` != 0'],
 546                         ['order' => ['priority', 'created']]
 547                 );
 548                 self::$db_duration += (microtime(true) - $stamp);
 549
 550                 while ($entry = DBA::fetch($entries)) {
 551                         if (!posix_kill($entry["pid"], 0)) {
 552                                 $stamp = (float)microtime(true);
 553                                 DBA::update(
 554                                         'workerqueue',
 555                                         ['executed' => DBA::NULL_DATETIME, 'pid' => 0],
 556                                         ['id' => $entry["id"]]
 557                                 );
 558                                 self::$db_duration += (microtime(true) - $stamp);
 559                                 self::$db_duration_write += (microtime(true) - $stamp);
 560                         } else {
 561                                 // Kill long running processes
 562                                 // Check if the priority is in a valid range
 563                                 if (!in_array($entry["priority"], [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE])) {
 564                                         $entry["priority"] = PRIORITY_MEDIUM;
 565                                 }
 566
 567                                 // Define the maximum durations
 568                                 $max_duration_defaults = [PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720];
 569                                 $max_duration = $max_duration_defaults[$entry["priority"]];
 570
 571                                 $argv = json_decode($entry["parameter"], true);
 572                                 $argv[0] = basename($argv[0]);
 573
 574                                 // How long is the process already running?
 575                                 $duration = (time() - strtotime($entry["executed"])) / 60;
 576                                 if ($duration > $max_duration) {
 577                                         Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") took more than ".$max_duration." minutes. It will be killed now.");
 578                                         posix_kill($entry["pid"], SIGTERM);
 579
 580                                         // We killed the stale process.
 581                                         // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 582                                         // Additionally we are lowering the priority. (But not PRIORITY_CRITICAL)
 583                                         $new_priority = $entry["priority"];
 584                                         if ($entry["priority"] == PRIORITY_HIGH) {
 585                                                 $new_priority = PRIORITY_MEDIUM;
 586                                         } elseif ($entry["priority"] == PRIORITY_MEDIUM) {
 587                                                 $new_priority = PRIORITY_LOW;
 588                                         } elseif ($entry["priority"] != PRIORITY_CRITICAL) {
 589                                                 $new_priority = PRIORITY_NEGLIGIBLE;
 590                                         }
 591                                         $stamp = (float)microtime(true);
 592                                         DBA::update(
 593                                                 'workerqueue',
 594                                                 ['executed' => DBA::NULL_DATETIME, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
 595                                                 ['id' => $entry["id"]]
 596                                         );
 597                                         self::$db_duration += (microtime(true) - $stamp);
 598                                         self::$db_duration_write += (microtime(true) - $stamp);
 599                                 } else {
 600                                         Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", Logger::DEBUG);
 601                                 }
 602                         }
 603                 }
 604         }
 605
 606         /**
 607          * @brief Checks if the number of active workers exceeds the given limits
 608          *
 609          * @return bool Are there too much workers running?
 610          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 611          */
 612         private static function tooMuchWorkers()
 613         {
 614                 $queues = Config::get("system", "worker_queues", 4);
 615
 616                 $maxqueues = $queues;
 617
 618                 $active = self::activeWorkers();
 619
 620                 // Decrease the number of workers at higher load
 621                 $load = System::currentLoad();
 622                 if ($load) {
 623                         $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 624
 625                         /* Default exponent 3 causes queues to rapidly decrease as load increases.
 626                          * If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
 627                          * For some environments, this rapid decrease is not needed.
 628                          * With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
 629                          */
 630                         $exponent = intval(Config::get('system', 'worker_load_exponent', 3));
 631                         $slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
 632                         $queues = intval(ceil($slope * $maxqueues));
 633
 634                         $processlist = '';
 635
 636                         if (Config::get('system', 'worker_jpm')) {
 637                                 $intervals = explode(',', Config::get('system', 'worker_jpm_range'));
 638                                 $jobs_per_minute = [];
 639                                 foreach ($intervals as $interval) {
 640                                         if ($interval == 0) {
 641                                                 continue;
 642                                         } else {
 643                                                 $interval = (int)$interval;
 644                                         }
 645
 646                                         $stamp = (float)microtime(true);
 647                                         $jobs = DBA::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ? MINUTE", $interval);
 648                                         self::$db_duration += (microtime(true) - $stamp);
 649                                         self::$db_duration_stat += (microtime(true) - $stamp);
 650                                         if ($job = DBA::fetch($jobs)) {
 651                                                 $jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
 652                                         }
 653                                         DBA::close($jobs);
 654                                 }
 655                                 $processlist = ' - jpm: '.implode('/', $jobs_per_minute);
 656                         }
 657
 658                         // Create a list of queue entries grouped by their priority
 659                         $listitem = [0 => ''];
 660
 661                         $idle_workers = $active;
 662
 663                         $deferred = self::deferredEntries();
 664
 665                         if (Config::get('system', 'worker_debug')) {
 666                                 $waiting_processes = 0;
 667                                 // Now adding all processes with workerqueue entries
 668                                 $stamp = (float)microtime(true);
 669                                 $jobs = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` AND `next_try` < ? GROUP BY `priority`", DateTimeFormat::utcNow());
 670                                 self::$db_duration += (microtime(true) - $stamp);
 671                                 self::$db_duration_stat += (microtime(true) - $stamp);
 672                                 while ($entry = DBA::fetch($jobs)) {
 673                                         $stamp = (float)microtime(true);
 674                                         $processes = DBA::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE NOT `done` AND `priority` = ?", $entry["priority"]);
 675                                         self::$db_duration += (microtime(true) - $stamp);
 676                                         self::$db_duration_stat += (microtime(true) - $stamp);
 677                                         if ($process = DBA::fetch($processes)) {
 678                                                 $idle_workers -= $process["running"];
 679                                                 $waiting_processes += $entry["entries"];
 680                                                 $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 681                                         }
 682                                         DBA::close($processes);
 683                                 }
 684                                 DBA::close($jobs);
 685                                 $entries = $deferred + $waiting_processes;
 686                         } else {
 687                                 $entries = self::totalEntries();
 688                                 $waiting_processes = max(0, $entries - $deferred);
 689                                 $stamp = (float)microtime(true);
 690                                 $jobs = DBA::p("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` GROUP BY `priority` ORDER BY `priority`");
 691                                 self::$db_duration += (microtime(true) - $stamp);
 692                                 self::$db_duration_stat += (microtime(true) - $stamp);
 693
 694                                 while ($entry = DBA::fetch($jobs)) {
 695                                         $idle_workers -= $entry["running"];
 696                                         $listitem[$entry["priority"]] = $entry["priority"].":".$entry["running"];
 697                                 }
 698                                 DBA::close($jobs);
 699                         }
 700
 701                         $listitem[0] = "0:" . max(0, $idle_workers);
 702
 703                         $processlist .= ' ('.implode(', ', $listitem).')';
 704
 705                         if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && self::entriesExists() && ($active >= $queues)) {
 706                                 $top_priority = self::highestPriority();
 707                                 $high_running = self::processWithPriorityActive($top_priority);
 708
 709                                 if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
 710                                         Logger::log("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", Logger::DEBUG);
 711                                         $queues = $active + 1;
 712                                 }
 713                         }
 714
 715                         Logger::log("Load: " . $load ."/" . $maxsysload . " - processes: " . $deferred . "/" . $active . "/" . $waiting_processes . $processlist . " - maximum: " . $queues . "/" . $maxqueues, Logger::DEBUG);
 716
 717                         // Are there fewer workers running as possible? Then fork a new one.
 718                         if (!Config::get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && ($entries > 1)) {
 719                                 Logger::log("Active workers: ".$active."/".$queues." Fork a new worker.", Logger::DEBUG);
 720                                 if (Config::get('system', 'worker_daemon_mode', false)) {
 721                                         self::IPCSetJobState(true);
 722                                 } else {
 723                                         self::spawnWorker();
 724                                 }
 725                         }
 726                 }
 727
 728                 // if there are too much worker, we don't spawn a new one.
 729                 if (Config::get('system', 'worker_daemon_mode', false) && ($active > $queues)) {
 730                         self::IPCSetJobState(false);
 731                 }
 732
 733                 return $active > $queues;
 734         }
 735
 736         /**
 737          * @brief Returns the number of active worker processes
 738          *
 739          * @return integer Number of active worker processes
 740          * @throws \Exception
 741          */
 742         private static function activeWorkers()
 743         {
 744                 $stamp = (float)microtime(true);
 745                 $count = DBA::count('process', ['command' => 'Worker.php']);
 746                 self::$db_duration += (microtime(true) - $stamp);
 747                 return $count;
 748         }
 749
 750         /**
 751          * @brief Returns waiting jobs for the current process id
 752          *
 753          * @return array waiting workerqueue jobs
 754          * @throws \Exception
 755          */
 756         private static function getWaitingJobForPID()
 757         {
 758                 $stamp = (float)microtime(true);
 759                 $r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
 760                 self::$db_duration += (microtime(true) - $stamp);
 761                 if (DBA::isResult($r)) {
 762                         return DBA::toArray($r);
 763                 }
 764                 DBA::close($r);
 765
 766                 return false;
 767         }
 768
 769         /**
 770          * @brief Returns the next jobs that should be executed
 771          *
 772          * @return array array with next jobs
 773          * @throws \Exception
 774          */
 775         private static function nextProcess()
 776         {
 777                 $priority = self::nextPriority();
 778                 if (empty($priority)) {
 779                         Logger::info('No tasks found');
 780                         return [];
 781                 }
 782
 783                 if ($priority <= PRIORITY_MEDIUM) {
 784                         $limit = Config::get('system', 'worker_fetch_limit', 1);
 785                 } else {
 786                         $limit = 1;
 787                 }
 788
 789                 $ids = [];
 790                 $stamp = (float)microtime(true);
 791                 $condition = ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()];
 792                 $tasks = DBA::select('workerqueue', ['id'], $condition, ['limit' => $limit, 'order' => ['created']]);
 793                 self::$db_duration += (microtime(true) - $stamp);
 794                 while ($task = DBA::fetch($tasks)) {
 795                         $ids[] = $task['id'];
 796                 }
 797                 DBA::close($tasks);
 798
 799                 Logger::info('Found:', ['id' => $ids, 'priority' => $priority]);
 800                 return $ids;
 801         }
 802
 803         /**
 804          * @brief Returns the priority of the next workerqueue job
 805          *
 806          * @return string priority
 807          * @throws \Exception
 808          */
 809         private static function nextPriority()
 810         {
 811                 $waiting = [];
 812                 $priorities = [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE];
 813                 foreach ($priorities as $priority) {
 814                         $stamp = (float)microtime(true);
 815                         if (DBA::exists('workerqueue', ["`priority` = ? AND `pid` = 0 AND NOT `done` AND `next_try` < ?", $priority, DateTimeFormat::utcNow()])) {
 816                                 $waiting[$priority] = true;
 817                         }
 818                         self::$db_duration += (microtime(true) - $stamp);
 819                 }
 820
 821                 if (!empty($waiting[PRIORITY_CRITICAL])) {
 822                         return PRIORITY_CRITICAL;
 823                 }
 824
 825                 $running = [];
 826                 $running_total = 0;
 827                 $stamp = (float)microtime(true);
 828                 $processes = DBA::p("SELECT COUNT(DISTINCT(`process`.`pid`)) AS `running`, `priority` FROM `process`
 829                         INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`
 830                         WHERE NOT `done` GROUP BY `priority`");
 831                 self::$db_duration += (microtime(true) - $stamp);
 832                 while ($process = DBA::fetch($processes)) {
 833                         $running[$process['priority']] = $process['running'];
 834                         $running_total += $process['running'];
 835                 }
 836                 DBA::close($processes);
 837
 838                 foreach ($priorities as $priority) {
 839                         if (!empty($waiting[$priority]) && empty($running[$priority])) {
 840                                 Logger::info('No running worker found with priority {priority} - assigning it.', ['priority' => $priority]);
 841                                 return $priority;
 842                         }
 843                 }
 844
 845                 $active = max(self::activeWorkers(), $running_total);
 846                 $priorities = max(count($waiting), count($running));
 847                 $exponent = 2;
 848
 849                 $total = 0;
 850                 for ($i = 1; $i <= $priorities; ++$i) {
 851                         $total += pow($i, $exponent);
 852                 }
 853
 854                 $limit = [];
 855                 for ($i = 1; $i <= $priorities; ++$i) {
 856                         $limit[$priorities - $i] = max(1, round($active * (pow($i, $exponent) / $total)));
 857                 }
 858
 859                 $i = 0;
 860                 foreach ($running as $priority => $workers) {
 861                         if ($workers < $limit[$i++]) {
 862                                 Logger::info('Priority {priority} has got {workers} workers out of a limit of {limit}', ['priority' => $priority, 'workers' => $workers, 'limit' => $limit[$i - 1]]);
 863                                 return $priority;
 864                         }
 865                 }
 866
 867                 if (!empty($waiting)) {
 868                         $priority = array_keys($waiting)[0];
 869                         Logger::info('No underassigned priority found, now taking the highest priority.', ['priority' => $priority]);
 870                         return $priority;
 871                 }
 872
 873                 return false;
 874         }
 875
 876         /**
 877          * @brief Find and claim the next worker process for us
 878          *
 879          * @return boolean Have we found something?
 880          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 881          */
 882         private static function findWorkerProcesses()
 883         {
 884                 $mypid = getmypid();
 885
 886                 $ids = self::nextProcess();
 887
 888                 // If there is no result we check without priority limit
 889                 if (empty($ids)) {
 890                         $stamp = (float)microtime(true);
 891                         $condition = ["`pid` = 0 AND NOT `done` AND `next_try` < ?", DateTimeFormat::utcNow()];
 892                         $result = DBA::select('workerqueue', ['id'], $condition, ['limit' => 1, 'order' => ['priority', 'created']]);
 893                         self::$db_duration += (microtime(true) - $stamp);
 894
 895                         while ($id = DBA::fetch($result)) {
 896                                 $ids[] = $id["id"];
 897                         }
 898                         DBA::close($result);
 899                 }
 900
 901                 if (!empty($ids)) {
 902                         $stamp = (float)microtime(true);
 903                         $condition = ['id' => $ids, 'done' => false, 'pid' => 0];
 904                         DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $mypid], $condition);
 905                         self::$db_duration += (microtime(true) - $stamp);
 906                         self::$db_duration_write += (microtime(true) - $stamp);
 907                 }
 908
 909                 return !empty($ids);
 910         }
 911
 912         /**
 913          * @brief Returns the next worker process
 914          *
 915          * @return string SQL statement
 916          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 917          */
 918         public static function workerProcess()
 919         {
 920                 // There can already be jobs for us in the queue.
 921                 $waiting = self::getWaitingJobForPID();
 922                 if (!empty($waiting)) {
 923                         return $waiting;
 924                 }
 925
 926                 $stamp = (float)microtime(true);
 927                 if (!Lock::acquire('worker_process')) {
 928                         return false;
 929                 }
 930                 self::$lock_duration += (microtime(true) - $stamp);
 931
 932                 $found = self::findWorkerProcesses();
 933
 934                 Lock::release('worker_process');
 935
 936                 if ($found) {
 937                         $stamp = (float)microtime(true);
 938                         $r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
 939                         self::$db_duration += (microtime(true) - $stamp);
 940                         return DBA::toArray($r);
 941                 }
 942                 return false;
 943         }
 944
 945         /**
 946          * @brief Removes a workerqueue entry from the current process
 947          * @return void
 948          * @throws \Exception
 949          */
 950         public static function unclaimProcess()
 951         {
 952                 $mypid = getmypid();
 953
 954                 $stamp = (float)microtime(true);
 955                 DBA::update('workerqueue', ['executed' => DBA::NULL_DATETIME, 'pid' => 0], ['pid' => $mypid, 'done' => false]);
 956                 self::$db_duration += (microtime(true) - $stamp);
 957                 self::$db_duration_write += (microtime(true) - $stamp);
 958         }
 959
 960         /**
 961          * @brief Call the front end worker
 962          * @return void
 963          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 964          */
 965         public static function callWorker()
 966         {
 967                 if (!Config::get("system", "frontend_worker")) {
 968                         return;
 969                 }
 970
 971                 $url = System::baseUrl()."/worker";
 972                 Network::fetchUrl($url, false, $redirects, 1);
 973         }
 974
 975         /**
 976          * @brief Call the front end worker if there aren't any active
 977          * @return void
 978          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 979          */
 980         public static function executeIfIdle()
 981         {
 982                 if (!Config::get("system", "frontend_worker")) {
 983                         return;
 984                 }
 985
 986                 // Do we have "proc_open"? Then we can fork the worker
 987                 if (function_exists("proc_open")) {
 988                         // When was the last time that we called the worker?
 989                         // Less than one minute? Then we quit
 990                         if ((time() - Config::get("system", "worker_started")) < 60) {
 991                                 return;
 992                         }
 993
 994                         Config::set("system", "worker_started", time());
 995
 996                         // Do we have enough running workers? Then we quit here.
 997                         if (self::tooMuchWorkers()) {
 998                                 // Cleaning dead processes
 999                                 self::killStaleWorkers();
1000                                 Process::deleteInactive();
1001
1002                                 return;
1003                         }
1004
1005                         self::runCron();
1006
1007                         Logger::log('Call worker', Logger::DEBUG);
1008                         self::spawnWorker();
1009                         return;
1010                 }
1011
1012                 // We cannot execute background processes.
1013                 // We now run the processes from the frontend.
1014                 // This won't work with long running processes.
1015                 self::runCron();
1016
1017                 self::clearProcesses();
1018
1019                 $workers = self::activeWorkers();
1020
1021                 if ($workers == 0) {
1022                         self::callWorker();
1023                 }
1024         }
1025
1026         /**
1027          * @brief Removes long running worker processes
1028          * @return void
1029          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1030          */
1031         public static function clearProcesses()
1032         {
1033                 $timeout = Config::get("system", "frontend_worker_timeout", 10);
1034
1035                 /// @todo We should clean up the corresponding workerqueue entries as well
1036                 $stamp = (float)microtime(true);
1037                 $condition = ["`created` < ? AND `command` = 'worker.php'",
1038                                 DateTimeFormat::utc("now - ".$timeout." minutes")];
1039                 DBA::delete('process', $condition);
1040                 self::$db_duration = (microtime(true) - $stamp);
1041                 self::$db_duration_write += (microtime(true) - $stamp);
1042         }
1043
1044         /**
1045          * @brief Runs the cron processes
1046          * @return void
1047          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1048          */
1049         private static function runCron()
1050         {
1051                 Logger::log('Add cron entries', Logger::DEBUG);
1052
1053                 // Check for spooled items
1054                 self::add(['priority' => PRIORITY_HIGH, 'force_priority' => true], 'SpoolPost');
1055
1056                 // Run the cron job that calls all other jobs
1057                 self::add(['priority' => PRIORITY_MEDIUM, 'force_priority' => true], 'Cron');
1058
1059                 // Cleaning dead processes
1060                 self::killStaleWorkers();
1061         }
1062
1063         /**
1064          * @brief Spawns a new worker
1065          * @param bool $do_cron
1066          * @return void
1067          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1068          */
1069         public static function spawnWorker($do_cron = false)
1070         {
1071                 $command = 'bin/worker.php';
1072
1073                 $args = ['no_cron' => !$do_cron];
1074
1075                 get_app()->proc_run($command, $args);
1076
1077                 // after spawning we have to remove the flag.
1078                 if (Config::get('system', 'worker_daemon_mode', false)) {
1079                         self::IPCSetJobState(false);
1080                 }
1081         }
1082
1083         /**
1084          * @brief Adds tasks to the worker queue
1085          *
1086          * @param (integer|array) priority or parameter array, strings are deprecated and are ignored
1087          *
1088          * next args are passed as $cmd command line
1089          * or: Worker::add(PRIORITY_HIGH, "Notifier", "drop", $drop_id);
1090          * or: Worker::add(array('priority' => PRIORITY_HIGH, 'dont_fork' => true), "CreateShadowEntry", $post_id);
1091          *
1092          * @return boolean "false" if proc_run couldn't be executed
1093          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1094          * @note $cmd and string args are surrounded with ""
1095          *
1096          * @hooks 'proc_run'
1097          *    array $arr
1098          *
1099          */
1100         public static function add($cmd)
1101         {
1102                 $args = func_get_args();
1103
1104                 if (!count($args)) {
1105                         return false;
1106                 }
1107
1108                 $arr = ['args' => $args, 'run_cmd' => true];
1109
1110                 Hook::callAll("proc_run", $arr);
1111                 if (!$arr['run_cmd'] || !count($args)) {
1112                         return true;
1113                 }
1114
1115                 $priority = PRIORITY_MEDIUM;
1116                 $dont_fork = Config::get("system", "worker_dont_fork", false);
1117                 $created = DateTimeFormat::utcNow();
1118                 $force_priority = false;
1119
1120                 $run_parameter = array_shift($args);
1121
1122                 if (is_int($run_parameter)) {
1123                         $priority = $run_parameter;
1124                 } elseif (is_array($run_parameter)) {
1125                         if (isset($run_parameter['priority'])) {
1126                                 $priority = $run_parameter['priority'];
1127                         }
1128                         if (isset($run_parameter['created'])) {
1129                                 $created = $run_parameter['created'];
1130                         }
1131                         if (isset($run_parameter['dont_fork'])) {
1132                                 $dont_fork = $run_parameter['dont_fork'];
1133                         }
1134                         if (isset($run_parameter['force_priority'])) {
1135                                 $force_priority = $run_parameter['force_priority'];
1136                         }
1137                 }
1138
1139                 $parameters = json_encode($args);
1140                 $found = DBA::exists('workerqueue', ['parameter' => $parameters, 'done' => false]);
1141
1142                 // Quit if there was a database error - a precaution for the update process to 3.5.3
1143                 if (DBA::errorNo() != 0) {
1144                         return false;
1145                 }
1146
1147                 if (!$found) {
1148                         DBA::insert('workerqueue', ['parameter' => $parameters, 'created' => $created, 'priority' => $priority]);
1149                 } elseif ($force_priority) {
1150                         DBA::update('workerqueue', ['priority' => $priority], ['parameter' => $parameters, 'done' => false, 'pid' => 0]);
1151                 }
1152
1153                 // Should we quit and wait for the worker to be called as a cronjob?
1154                 if ($dont_fork) {
1155                         return true;
1156                 }
1157
1158                 // If there is a lock then we don't have to check for too much worker
1159                 if (!Lock::acquire('worker', 0)) {
1160                         return true;
1161                 }
1162
1163                 // If there are already enough workers running, don't fork another one
1164                 $quit = self::tooMuchWorkers();
1165                 Lock::release('worker');
1166
1167                 if ($quit) {
1168                         return true;
1169                 }
1170
1171                 // We tell the daemon that a new job entry exists
1172                 if (Config::get('system', 'worker_daemon_mode', false)) {
1173                         // We don't have to set the IPC flag - this is done in "tooMuchWorkers"
1174                         return true;
1175                 }
1176
1177                 // Now call the worker to execute the jobs that we just added to the queue
1178                 self::spawnWorker();
1179
1180                 return true;
1181         }
1182
1183         /**
1184          * Defers the current worker entry
1185          */
1186         public static function defer()
1187         {
1188                 if (empty(BaseObject::getApp()->queue)) {
1189                         return;
1190                 }
1191
1192                 $queue = BaseObject::getApp()->queue;
1193
1194                 $retrial = $queue['retrial'];
1195                 $id = $queue['id'];
1196                 $priority = $queue['priority'];
1197
1198                 if ($retrial > 14) {
1199                         Logger::log('Id ' . $id . ' had been tried 14 times. We stop now.', Logger::DEBUG);
1200                         return;
1201                 }
1202
1203                 // Calculate the delay until the next trial
1204                 $delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
1205                 $next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
1206
1207                 if (($priority < PRIORITY_MEDIUM) && ($retrial > 2)) {
1208                         $priority = PRIORITY_MEDIUM;
1209                 } elseif (($priority < PRIORITY_LOW) && ($retrial > 5)) {
1210                         $priority = PRIORITY_LOW;
1211                 } elseif (($priority < PRIORITY_NEGLIGIBLE) && ($retrial > 7)) {
1212                         $priority = PRIORITY_NEGLIGIBLE;
1213                 }
1214
1215                 Logger::log('Defer execution ' . $retrial . ' of id ' . $id . ' to ' . $next . ' - priority old/new: ' . $queue['priority'] . '/' . $priority, Logger::DEBUG);
1216
1217                 $stamp = (float)microtime(true);
1218                 $fields = ['retrial' => $retrial + 1, 'next_try' => $next, 'executed' => DBA::NULL_DATETIME, 'pid' => 0, 'priority' => $priority];
1219                 DBA::update('workerqueue', $fields, ['id' => $id]);
1220                 self::$db_duration += (microtime(true) - $stamp);
1221                 self::$db_duration_write += (microtime(true) - $stamp);
1222         }
1223
1224         /**
1225          * Log active processes into the "process" table
1226          *
1227          * @brief Log active processes into the "process" table
1228          */
1229         public static function startProcess()
1230         {
1231                 $trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1);
1232
1233                 $command = basename($trace[0]['file']);
1234
1235                 Process::deleteInactive();
1236
1237                 Process::insert($command);
1238         }
1239
1240         /**
1241          * Remove the active process from the "process" table
1242          *
1243          * @brief Remove the active process from the "process" table
1244          * @return bool
1245          * @throws \Exception
1246          */
1247         public static function endProcess()
1248         {
1249                 return Process::deleteByPid();
1250         }
1251
1252         /**
1253          * Set the flag if some job is waiting
1254          *
1255          * @brief Set the flag if some job is waiting
1256          * @param boolean $jobs Is there a waiting job?
1257          * @throws \Exception
1258          */
1259         public static function IPCSetJobState($jobs)
1260         {
1261                 $stamp = (float)microtime(true);
1262                 DBA::update('worker-ipc', ['jobs' => $jobs], ['key' => 1], true);
1263                 self::$db_duration += (microtime(true) - $stamp);
1264                 self::$db_duration_write += (microtime(true) - $stamp);
1265         }
1266
1267         /**
1268          * Checks if some worker job waits to be executed
1269          *
1270          * @brief Checks if some worker job waits to be executed
1271          * @return bool
1272          * @throws \Exception
1273          */
1274         public static function IPCJobsExists()
1275         {
1276                 $stamp = (float)microtime(true);
1277                 $row = DBA::selectFirst('worker-ipc', ['jobs'], ['key' => 1]);
1278                 self::$db_duration += (microtime(true) - $stamp);
1279
1280                 // When we don't have a row, no job is running
1281                 if (!DBA::isResult($row)) {
1282                         return false;
1283                 }
1284
1285                 return (bool)$row['jobs'];
1286         }
1287 }