include/poller.php

   1 <?php
   2 if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
   3         $directory = dirname($_SERVER["argv"][0]);
   4
   5         if (substr($directory, 0, 1) != "/")
   6                 $directory = $_SERVER["PWD"]."/".$directory;
   7
   8         $directory = realpath($directory."/..");
   9
  10         chdir($directory);
  11 }
  12
  13 use \Friendica\Core\Config;
  14
  15 require_once("boot.php");
  16
  17 function poller_run($argv, $argc){
  18         global $a, $db;
  19
  20         if(is_null($a)) {
  21                 $a = new App;
  22         }
  23
  24         if(is_null($db)) {
  25                 @include(".htconfig.php");
  26                 require_once("include/dba.php");
  27                 $db = new dba($db_host, $db_user, $db_pass, $db_data);
  28                 unset($db_host, $db_user, $db_pass, $db_data);
  29         };
  30
  31         Config::load();
  32
  33         // Quit when in maintenance
  34         if (Config::get('system', 'maintenance', true)) {
  35                 return;
  36         }
  37
  38         $a->set_baseurl(Config::get('system', 'url'));
  39
  40         load_hooks();
  41
  42         $a->start_process();
  43
  44         if ($a->min_memory_reached()) {
  45                 return;
  46         }
  47
  48         if (poller_max_connections_reached()) {
  49                 return;
  50         }
  51
  52         if ($a->maxload_reached()) {
  53                 return;
  54         }
  55
  56         if(($argc <= 1) OR ($argv[1] != "no_cron")) {
  57                 poller_run_cron();
  58         }
  59
  60         if ($a->max_processes_reached()) {
  61                 return;
  62         }
  63
  64         // Checking the number of workers
  65         if (poller_too_much_workers()) {
  66                 poller_kill_stale_workers();
  67                 return;
  68         }
  69
  70         $starttime = time();
  71
  72         while ($r = poller_worker_process()) {
  73
  74                 // Check free memory
  75                 if ($a->min_memory_reached()) {
  76                         return;
  77                 }
  78
  79                 // Count active workers and compare them with a maximum value that depends on the load
  80                 if (poller_too_much_workers()) {
  81                         return;
  82                 }
  83
  84                 if (!poller_execute($r[0])) {
  85                         return;
  86                 }
  87
  88                 // Quit the poller once every hour
  89                 if (time() > ($starttime + 3600))
  90                         return;
  91         }
  92
  93 }
  94
  95 /**
  96  * @brief Execute a worker entry
  97  *
  98  * @param array $queue Workerqueue entry
  99  *
 100  * @return boolean "true" if further processing should be stopped
 101  */
 102 function poller_execute($queue) {
 103
 104         $a = get_app();
 105
 106         $mypid = getmypid();
 107
 108         // Quit when in maintenance
 109         if (Config::get('system', 'maintenance', true)) {
 110                 return false;
 111         }
 112
 113         // Constantly check the number of parallel database processes
 114         if ($a->max_processes_reached()) {
 115                 return false;
 116         }
 117
 118         // Constantly check the number of available database connections to let the frontend be accessible at any time
 119         if (poller_max_connections_reached()) {
 120                 return false;
 121         }
 122
 123         $upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
 124                 dbesc(datetime_convert()),
 125                 intval($mypid),
 126                 intval($queue["id"]));
 127
 128         if (!$upd) {
 129                 logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
 130                 q("COMMIT");
 131                 return true;
 132         }
 133
 134         // Assure that there are no tasks executed twice
 135         $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 136         if (!$id) {
 137                 logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
 138                 q("COMMIT");
 139                 return true;
 140         } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
 141                 logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
 142                 q("COMMIT");
 143                 return true;
 144         } elseif ($id[0]["pid"] != $mypid) {
 145                 logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
 146                 q("COMMIT");
 147                 return true;
 148         }
 149         q("COMMIT");
 150
 151         $argv = json_decode($queue["parameter"]);
 152
 153         // Check for existance and validity of the include file
 154         $include = $argv[0];
 155
 156         if (!validate_include($include)) {
 157                 logger("Include file ".$argv[0]." is not valid!");
 158                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 159                 return true;
 160         }
 161
 162         require_once($include);
 163
 164         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 165
 166         if (function_exists($funcname)) {
 167
 168                 poller_exec_function($queue, $funcname, $argv);
 169
 170                 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 171         } else {
 172                 logger("Function ".$funcname." does not exist");
 173         }
 174
 175         return true;
 176 }
 177
 178 /**
 179  * @brief Execute a function from the queue
 180  *
 181  * @param array $queue Workerqueue entry
 182  * @param string $funcname name of the function
 183  * @param array $argv Array of values to be passed to the function
 184  */
 185 function poller_exec_function($queue, $funcname, $argv) {
 186
 187         $a = get_app();
 188
 189         $mypid = getmypid();
 190
 191         $argc = count($argv);
 192
 193         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 194
 195         $stamp = (float)microtime(true);
 196
 197         // We use the callstack here to analyze the performance of executed worker entries.
 198         // For this reason the variables have to be initialized.
 199         if (Config::get("system", "profiler")) {
 200                 $a->performance["start"] = microtime(true);
 201                 $a->performance["database"] = 0;
 202                 $a->performance["database_write"] = 0;
 203                 $a->performance["network"] = 0;
 204                 $a->performance["file"] = 0;
 205                 $a->performance["rendering"] = 0;
 206                 $a->performance["parser"] = 0;
 207                 $a->performance["marktime"] = 0;
 208                 $a->performance["markstart"] = microtime(true);
 209                 $a->callstack = array();
 210         }
 211
 212         // For better logging create a new process id for every worker call
 213         // But preserve the old one for the worker
 214         $old_process_id = $a->process_id;
 215         $a->process_id = uniqid("wrk", true);
 216
 217         $funcname($argv, $argc);
 218
 219         $a->process_id = $old_process_id;
 220
 221         $duration = number_format(microtime(true) - $stamp, 3);
 222
 223         if ($duration > 3600) {
 224                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 225         } elseif ($duration > 600) {
 226                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 227         } elseif ($duration > 300) {
 228                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 229         } elseif ($duration > 120) {
 230                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 231         }
 232
 233         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 234
 235         // Write down the performance values into the log
 236         if (Config::get("system", "profiler")) {
 237                 $duration = microtime(true)-$a->performance["start"];
 238
 239                 if (Config::get("rendertime", "callstack")) {
 240                         if (isset($a->callstack["database"])) {
 241                                 $o = "\nDatabase Read:\n";
 242                                 foreach ($a->callstack["database"] AS $func => $time) {
 243                                         $time = round($time, 3);
 244                                         if ($time > 0)
 245                                                 $o .= $func.": ".$time."\n";
 246                                 }
 247                         }
 248                         if (isset($a->callstack["database_write"])) {
 249                                 $o .= "\nDatabase Write:\n";
 250                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 251                                         $time = round($time, 3);
 252                                         if ($time > 0)
 253                                                 $o .= $func.": ".$time."\n";
 254                                 }
 255                         }
 256                         if (isset($a->callstack["network"])) {
 257                                 $o .= "\nNetwork:\n";
 258                                 foreach ($a->callstack["network"] AS $func => $time) {
 259                                         $time = round($time, 3);
 260                                         if ($time > 0)
 261                                                 $o .= $func.": ".$time."\n";
 262                                 }
 263                         }
 264                 } else {
 265                         $o = '';
 266                 }
 267
 268                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 269                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 270                         number_format($a->performance["database_write"], 2),
 271                         number_format($a->performance["network"], 2),
 272                         number_format($a->performance["file"], 2),
 273                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 274                         number_format($duration, 2)),
 275                         LOGGER_DEBUG);
 276         }
 277
 278         $cooldown = Config::get("system", "worker_cooldown", 0);
 279
 280         if ($cooldown > 0) {
 281                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 282                 sleep($cooldown);
 283         }
 284 }
 285
 286 /**
 287  * @brief Checks if the number of database connections has reached a critical limit.
 288  *
 289  * @return bool Are more than 3/4 of the maximum connections used?
 290  */
 291 function poller_max_connections_reached() {
 292
 293         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 294         $max = Config::get("system", "max_connections");
 295
 296         // Fetch the percentage level where the poller will get active
 297         $maxlevel = Config::get("system", "max_connections_level", 75);
 298
 299         if ($max == 0) {
 300                 // the maximum number of possible user connections can be a system variable
 301                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 302                 if ($r)
 303                         $max = $r[0]["Value"];
 304
 305                 // Or it can be granted. This overrides the system variable
 306                 $r = q("SHOW GRANTS");
 307                 if ($r)
 308                         foreach ($r AS $grants) {
 309                                 $grant = array_pop($grants);
 310                                 if (stristr($grant, "GRANT USAGE ON"))
 311                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
 312                                                 $max = $match[1];
 313                         }
 314         }
 315
 316         // If $max is set we will use the processlist to determine the current number of connections
 317         // The processlist only shows entries of the current user
 318         if ($max != 0) {
 319                 $r = q("SHOW PROCESSLIST");
 320                 if (!dbm::is_result($r))
 321                         return false;
 322
 323                 $used = count($r);
 324
 325                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 326
 327                 $level = ($used / $max) * 100;
 328
 329                 if ($level >= $maxlevel) {
 330                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 331                         return true;
 332                 }
 333         }
 334
 335         // We will now check for the system values.
 336         // This limit could be reached although the user limits are fine.
 337         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 338         if (!$r)
 339                 return false;
 340
 341         $max = intval($r[0]["Value"]);
 342         if ($max == 0)
 343                 return false;
 344
 345         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 346         if (!$r)
 347                 return false;
 348
 349         $used = intval($r[0]["Value"]);
 350         if ($used == 0)
 351                 return false;
 352
 353         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 354
 355         $level = $used / $max * 100;
 356
 357         if ($level < $maxlevel)
 358                 return false;
 359
 360         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 361         return true;
 362 }
 363
 364 /**
 365  * @brief fix the queue entry if the worker process died
 366  *
 367  */
 368 function poller_kill_stale_workers() {
 369         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 370
 371         if (!dbm::is_result($r)) {
 372                 // No processing here needed
 373                 return;
 374         }
 375
 376         foreach ($r AS $pid) {
 377                 if (!posix_kill($pid["pid"], 0)) {
 378                         q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = 0 WHERE `pid` = %d",
 379                                 dbesc(NULL_DATE), intval($pid["pid"]));
 380                 } else {
 381                         // Kill long running processes
 382
 383                         // Check if the priority is in a valid range
 384                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
 385                                 $pid["priority"] = PRIORITY_MEDIUM;
 386
 387                         // Define the maximum durations
 388                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 389                         $max_duration = $max_duration_defaults[$pid["priority"]];
 390
 391                         $argv = json_decode($pid["parameter"]);
 392                         $argv[0] = basename($argv[0]);
 393
 394                         // How long is the process already running?
 395                         $duration = (time() - strtotime($pid["executed"])) / 60;
 396                         if ($duration > $max_duration) {
 397                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 398                                 posix_kill($pid["pid"], SIGTERM);
 399
 400                                 // We killed the stale process.
 401                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 402                                 // Additionally we are lowering the priority.
 403                                 q("UPDATE `workerqueue` SET `executed` = '%s', `created` = '%s',
 404                                                         `priority` = %d, `pid` = 0 WHERE `pid` = %d",
 405                                         dbesc(NULL_DATE),
 406                                         dbesc(datetime_convert()),
 407                                         intval(PRIORITY_NEGLIGIBLE),
 408                                         intval($pid["pid"]));
 409                         } else {
 410                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 411                         }
 412                 }
 413         }
 414 }
 415
 416 /**
 417  * @brief Checks if the number of active workers exceeds the given limits
 418  *
 419  * @return bool Are there too much workers running?
 420  */
 421 function poller_too_much_workers() {
 422         $queues = Config::get("system", "worker_queues", 4);
 423
 424         $maxqueues = $queues;
 425
 426         $active = poller_active_workers();
 427
 428         // Decrease the number of workers at higher load
 429         $load = current_load();
 430         if($load) {
 431                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 432
 433                 $maxworkers = $queues;
 434
 435                 // Some magical mathemathics to reduce the workers
 436                 $exponent = 3;
 437                 $slope = $maxworkers / pow($maxsysload, $exponent);
 438                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 439
 440                 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
 441                 $entries = $s[0]["total"];
 442
 443                 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
 444                         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 445                         $top_priority = $s[0]["priority"];
 446
 447                         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 448                                 intval($top_priority), dbesc(NULL_DATE));
 449                         $high_running = dbm::is_result($s);
 450
 451                         if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
 452                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 453                                 $queues = $active + 1;
 454                         }
 455                 }
 456
 457                 // Create a list of queue entries grouped by their priority
 458                 $running = array(PRIORITY_CRITICAL => 0,
 459                                 PRIORITY_HIGH => 0,
 460                                 PRIORITY_MEDIUM => 0,
 461                                 PRIORITY_LOW => 0,
 462                                 PRIORITY_NEGLIGIBLE => 0);
 463
 464                 $r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
 465                 if (dbm::is_result($r))
 466                         foreach ($r AS $process)
 467                                 $running[$process["priority"]] = $process["running"];
 468
 469                 $processlist = "";
 470                 $r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 471                 if (dbm::is_result($r))
 472                         foreach ($r as $entry) {
 473                                 if ($processlist != "")
 474                                         $processlist .= ", ";
 475                                 $processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
 476                         }
 477
 478                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 479
 480                 // Are there fewer workers running as possible? Then fork a new one.
 481                 if (!Config::get("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
 482                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 483                         $args = array("include/poller.php", "no_cron");
 484                         $a = get_app();
 485                         $a->proc_run($args);
 486                 }
 487         }
 488
 489         return($active >= $queues);
 490 }
 491
 492 /**
 493  * @brief Returns the number of active poller processes
 494  *
 495  * @return integer Number of active poller processes
 496  */
 497 function poller_active_workers() {
 498         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 499
 500         return($workers[0]["processes"]);
 501 }
 502
 503 /**
 504  * @brief Check if we should pass some slow processes
 505  *
 506  * When the active processes of the highest priority are using more than 2/3
 507  * of all processes, we let pass slower processes.
 508  *
 509  * @param string $highest_priority Returns the currently highest priority
 510  * @return bool We let pass a slower process than $highest_priority
 511  */
 512 function poller_passing_slow(&$highest_priority) {
 513
 514         $highest_priority = 0;
 515
 516         $r = q("SELECT `priority`
 517                 FROM `process`
 518                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 519
 520         // No active processes at all? Fine
 521         if (!dbm::is_result($r))
 522                 return(false);
 523
 524         $priorities = array();
 525         foreach ($r AS $line)
 526                 $priorities[] = $line["priority"];
 527
 528         // Should not happen
 529         if (count($priorities) == 0)
 530                 return(false);
 531
 532         $highest_priority = min($priorities);
 533
 534         // The highest process is already the slowest one?
 535         // Then we quit
 536         if ($highest_priority == PRIORITY_NEGLIGIBLE)
 537                 return(false);
 538
 539         $high = 0;
 540         foreach ($priorities AS $priority)
 541                 if ($priority == $highest_priority)
 542                         ++$high;
 543
 544         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 545         $passing_slow = (($high/count($priorities)) > (2/3));
 546
 547         if ($passing_slow)
 548                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 549
 550         return($passing_slow);
 551 }
 552
 553 /**
 554  * @brief Returns the next worker process
 555  *
 556  * @return string SQL statement
 557  */
 558 function poller_worker_process() {
 559
 560         q("START TRANSACTION;");
 561
 562         // Check if we should pass some low priority process
 563         $highest_priority = 0;
 564
 565         if (poller_passing_slow($highest_priority)) {
 566                 // Are there waiting processes with a higher priority than the currently highest?
 567                 $r = q("SELECT * FROM `workerqueue`
 568                                 WHERE `executed` <= '%s' AND `priority` < %d
 569                                 ORDER BY `priority`, `created` LIMIT 1",
 570                                 dbesc(NULL_DATE),
 571                                 intval($highest_priority));
 572                 if (dbm::is_result($r)) {
 573                         return $r;
 574                 }
 575                 // Give slower processes some processing time
 576                 $r = q("SELECT * FROM `workerqueue`
 577                                 WHERE `executed` <= '%s' AND `priority` > %d
 578                                 ORDER BY `priority`, `created` LIMIT 1",
 579                                 dbesc(NULL_DATE),
 580                                 intval($highest_priority));
 581         }
 582
 583         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 584         if (($highest_priority == 0) OR !dbm::is_result($r)) {
 585                 $r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1", dbesc(NULL_DATE));
 586         }
 587         return $r;
 588 }
 589
 590 /**
 591  * @brief Call the front end worker
 592  */
 593 function call_worker() {
 594         if (!Config::get("system", "frontend_worker")) {
 595                 return;
 596         }
 597
 598         $url = App::get_baseurl()."/worker";
 599         fetch_url($url, false, $redirects, 1);
 600 }
 601
 602 /**
 603  * @brief Call the front end worker if there aren't any active
 604  */
 605 function call_worker_if_idle() {
 606         if (!Config::get("system", "frontend_worker")) {
 607                 return;
 608         }
 609
 610         // Do we have "proc_open"? Then we can fork the poller
 611         if (function_exists("proc_open")) {
 612                 // When was the last time that we called the worker?
 613                 // Less than one minute? Then we quit
 614                 if ((time() - Config::get("system", "worker_started")) < 60) {
 615                         return;
 616                 }
 617
 618                 set_config("system", "worker_started", time());
 619
 620                 // Do we have enough running workers? Then we quit here.
 621                 if (poller_too_much_workers()) {
 622                         // Cleaning dead processes
 623                         poller_kill_stale_workers();
 624                         get_app()->remove_inactive_processes();
 625
 626                         return;
 627                 }
 628
 629                 poller_run_cron();
 630
 631                 logger('Call poller', LOGGER_DEBUG);
 632
 633                 $args = array("include/poller.php", "no_cron");
 634                 $a = get_app();
 635                 $a->proc_run($args);
 636                 return;
 637         }
 638
 639         // We cannot execute background processes.
 640         // We now run the processes from the frontend.
 641         // This won't work with long running processes.
 642         poller_run_cron();
 643
 644         clear_worker_processes();
 645
 646         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 647
 648         if ($workers[0]["processes"] == 0) {
 649                 call_worker();
 650         }
 651 }
 652
 653 /**
 654  * @brief Removes long running worker processes
 655  */
 656 function clear_worker_processes() {
 657         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 658
 659         /// @todo We should clean up the corresponding workerqueue entries as well
 660         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 661                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 662 }
 663
 664 /**
 665  * @brief Runs the cron processes
 666  */
 667 function poller_run_cron() {
 668         logger('Add cron entries', LOGGER_DEBUG);
 669
 670         // Check for spooled items
 671         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 672
 673         // Run the cron job that calls all other jobs
 674         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 675
 676         // Run the cronhooks job separately from cron for being able to use a different timing
 677         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 678
 679         // Cleaning dead processes
 680         poller_kill_stale_workers();
 681 }
 682
 683 if (array_search(__file__,get_included_files())===0){
 684         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 685
 686         get_app()->end_process();
 687
 688         killme();
 689 }
 690 ?>