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