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