include/poller.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\Config;
   5 use Friendica\Util\Lock;
   6
   7 if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
   8         $directory = dirname($_SERVER["argv"][0]);
   9
  10         if (substr($directory, 0, 1) != "/")
  11                 $directory = $_SERVER["PWD"]."/".$directory;
  12
  13         $directory = realpath($directory."/..");
  14
  15         chdir($directory);
  16 }
  17
  18 require_once("boot.php");
  19
  20 function poller_run($argv, $argc){
  21         global $a, $db;
  22
  23         $a = new App(dirname(__DIR__));
  24
  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         Config::load();
  31
  32         // Quit when in maintenance
  33         if (Config::get('system', 'maintenance', true)) {
  34                 return;
  35         }
  36
  37         $a->set_baseurl(Config::get('system', 'url'));
  38
  39         load_hooks();
  40
  41         if (($argc <= 1) OR ($argv[1] != "no_cron")) {
  42                 poller_run_cron();
  43         }
  44
  45         $a->start_process();
  46
  47         if ($a->min_memory_reached()) {
  48                 return;
  49         }
  50
  51         if (poller_max_connections_reached()) {
  52                 return;
  53         }
  54
  55         if ($a->maxload_reached()) {
  56                 return;
  57         }
  58
  59         if ($a->max_processes_reached()) {
  60                 return;
  61         }
  62
  63         if (!Lock::set('poller_worker')) {
  64                 return;
  65         }
  66
  67         // Checking the number of workers
  68         if (poller_too_much_workers()) {
  69                 poller_kill_stale_workers();
  70                 return;
  71         }
  72
  73         Lock::remove('poller_worker');
  74
  75         $starttime = time();
  76
  77         while ($r = poller_worker_process()) {
  78
  79                 if (!poller_claim_process($r[0])) {
  80                         continue;
  81                 }
  82
  83                 // Check free memory
  84                 if ($a->min_memory_reached()) {
  85                         logger('Memory limit reached, quitting.', LOGGER_DEBUG);
  86                         return;
  87                 }
  88
  89                 if (!Lock::set('poller_worker')) {
  90                         return;
  91                 }
  92
  93                 // Count active workers and compare them with a maximum value that depends on the load
  94                 if (poller_too_much_workers()) {
  95                         logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
  96                         return;
  97                 }
  98
  99                 Lock::remove('poller_worker');
 100
 101                 if (!poller_execute($r[0])) {
 102                         logger('Process execution failed, quitting.', LOGGER_DEBUG);
 103                         return;
 104                 }
 105
 106                 // Quit the poller once every hour
 107                 if (time() > ($starttime + 3600)) {
 108                         logger('Process lifetime reachted, quitting.', LOGGER_DEBUG);
 109                         return;
 110                 }
 111         }
 112         logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
 113 }
 114
 115 /**
 116  * @brief Execute a worker entry
 117  *
 118  * @param array $queue Workerqueue entry
 119  *
 120  * @return boolean "true" if further processing should be stopped
 121  */
 122 function poller_execute($queue) {
 123
 124         $a = get_app();
 125
 126         $mypid = getmypid();
 127
 128         // Quit when in maintenance
 129         if (Config::get('system', 'maintenance', true)) {
 130                 logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 131                 return false;
 132         }
 133
 134         // Constantly check the number of parallel database processes
 135         if ($a->max_processes_reached()) {
 136                 logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 137                 return false;
 138         }
 139
 140         // Constantly check the number of available database connections to let the frontend be accessible at any time
 141         if (poller_max_connections_reached()) {
 142                 logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
 143                 return false;
 144         }
 145
 146         $argv = json_decode($queue["parameter"]);
 147
 148         // Check for existance and validity of the include file
 149         $include = $argv[0];
 150
 151         if (!validate_include($include)) {
 152                 logger("Include file ".$argv[0]." is not valid!");
 153                 dba::delete('workerqueue', array('id' => $queue["id"]));
 154                 return true;
 155         }
 156
 157         require_once($include);
 158
 159         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 160
 161         if (function_exists($funcname)) {
 162
 163                 poller_exec_function($queue, $funcname, $argv);
 164                 dba::delete('workerqueue', array('id' => $queue["id"]));
 165         } else {
 166                 logger("Function ".$funcname." does not exist");
 167         }
 168
 169         return true;
 170 }
 171
 172 /**
 173  * @brief Execute a function from the queue
 174  *
 175  * @param array $queue Workerqueue entry
 176  * @param string $funcname name of the function
 177  * @param array $argv Array of values to be passed to the function
 178  */
 179 function poller_exec_function($queue, $funcname, $argv) {
 180
 181         $a = get_app();
 182
 183         $mypid = getmypid();
 184
 185         $argc = count($argv);
 186
 187         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 188
 189         $stamp = (float)microtime(true);
 190
 191         // We use the callstack here to analyze the performance of executed worker entries.
 192         // For this reason the variables have to be initialized.
 193         if (Config::get("system", "profiler")) {
 194                 $a->performance["start"] = microtime(true);
 195                 $a->performance["database"] = 0;
 196                 $a->performance["database_write"] = 0;
 197                 $a->performance["network"] = 0;
 198                 $a->performance["file"] = 0;
 199                 $a->performance["rendering"] = 0;
 200                 $a->performance["parser"] = 0;
 201                 $a->performance["marktime"] = 0;
 202                 $a->performance["markstart"] = microtime(true);
 203                 $a->callstack = array();
 204         }
 205
 206         // For better logging create a new process id for every worker call
 207         // But preserve the old one for the worker
 208         $old_process_id = $a->process_id;
 209         $a->process_id = uniqid("wrk", true);
 210
 211         $funcname($argv, $argc);
 212
 213         $a->process_id = $old_process_id;
 214
 215         $duration = number_format(microtime(true) - $stamp, 3);
 216
 217         if ($duration > 3600) {
 218                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 219         } elseif ($duration > 600) {
 220                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 221         } elseif ($duration > 300) {
 222                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 223         } elseif ($duration > 120) {
 224                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 225         }
 226
 227         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 228
 229         // Write down the performance values into the log
 230         if (Config::get("system", "profiler")) {
 231                 $duration = microtime(true)-$a->performance["start"];
 232
 233                 if (Config::get("rendertime", "callstack")) {
 234                         if (isset($a->callstack["database"])) {
 235                                 $o = "\nDatabase Read:\n";
 236                                 foreach ($a->callstack["database"] AS $func => $time) {
 237                                         $time = round($time, 3);
 238                                         if ($time > 0)
 239                                                 $o .= $func.": ".$time."\n";
 240                                 }
 241                         }
 242                         if (isset($a->callstack["database_write"])) {
 243                                 $o .= "\nDatabase Write:\n";
 244                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 245                                         $time = round($time, 3);
 246                                         if ($time > 0)
 247                                                 $o .= $func.": ".$time."\n";
 248                                 }
 249                         }
 250                         if (isset($a->callstack["network"])) {
 251                                 $o .= "\nNetwork:\n";
 252                                 foreach ($a->callstack["network"] AS $func => $time) {
 253                                         $time = round($time, 3);
 254                                         if ($time > 0)
 255                                                 $o .= $func.": ".$time."\n";
 256                                 }
 257                         }
 258                 } else {
 259                         $o = '';
 260                 }
 261
 262                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 263                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 264                         number_format($a->performance["database_write"], 2),
 265                         number_format($a->performance["network"], 2),
 266                         number_format($a->performance["file"], 2),
 267                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 268                         number_format($duration, 2)),
 269                         LOGGER_DEBUG);
 270         }
 271
 272         $cooldown = Config::get("system", "worker_cooldown", 0);
 273
 274         if ($cooldown > 0) {
 275                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 276                 sleep($cooldown);
 277         }
 278 }
 279
 280 /**
 281  * @brief Checks if the number of database connections has reached a critical limit.
 282  *
 283  * @return bool Are more than 3/4 of the maximum connections used?
 284  */
 285 function poller_max_connections_reached() {
 286
 287         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 288         $max = Config::get("system", "max_connections");
 289
 290         // Fetch the percentage level where the poller will get active
 291         $maxlevel = Config::get("system", "max_connections_level", 75);
 292
 293         if ($max == 0) {
 294                 // the maximum number of possible user connections can be a system variable
 295                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 296                 if ($r)
 297                         $max = $r[0]["Value"];
 298
 299                 // Or it can be granted. This overrides the system variable
 300                 $r = q("SHOW GRANTS");
 301                 if ($r)
 302                         foreach ($r AS $grants) {
 303                                 $grant = array_pop($grants);
 304                                 if (stristr($grant, "GRANT USAGE ON"))
 305                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
 306                                                 $max = $match[1];
 307                         }
 308         }
 309
 310         // If $max is set we will use the processlist to determine the current number of connections
 311         // The processlist only shows entries of the current user
 312         if ($max != 0) {
 313                 $r = q("SHOW PROCESSLIST");
 314                 if (!dbm::is_result($r))
 315                         return false;
 316
 317                 $used = count($r);
 318
 319                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 320
 321                 $level = ($used / $max) * 100;
 322
 323                 if ($level >= $maxlevel) {
 324                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 325                         return true;
 326                 }
 327         }
 328
 329         // We will now check for the system values.
 330         // This limit could be reached although the user limits are fine.
 331         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 332         if (!$r)
 333                 return false;
 334
 335         $max = intval($r[0]["Value"]);
 336         if ($max == 0)
 337                 return false;
 338
 339         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 340         if (!$r)
 341                 return false;
 342
 343         $used = intval($r[0]["Value"]);
 344         if ($used == 0)
 345                 return false;
 346
 347         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 348
 349         $level = $used / $max * 100;
 350
 351         if ($level < $maxlevel)
 352                 return false;
 353
 354         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 355         return true;
 356 }
 357
 358 /**
 359  * @brief fix the queue entry if the worker process died
 360  *
 361  */
 362 function poller_kill_stale_workers() {
 363         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 364
 365         if (!dbm::is_result($r)) {
 366                 // No processing here needed
 367                 return;
 368         }
 369
 370         foreach ($r AS $pid) {
 371                 if (!posix_kill($pid["pid"], 0)) {
 372                         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
 373                                         array('pid' => $pid["pid"]));
 374                 } else {
 375                         // Kill long running processes
 376
 377                         // Check if the priority is in a valid range
 378                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
 379                                 $pid["priority"] = PRIORITY_MEDIUM;
 380
 381                         // Define the maximum durations
 382                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 383                         $max_duration = $max_duration_defaults[$pid["priority"]];
 384
 385                         $argv = json_decode($pid["parameter"]);
 386                         $argv[0] = basename($argv[0]);
 387
 388                         // How long is the process already running?
 389                         $duration = (time() - strtotime($pid["executed"])) / 60;
 390                         if ($duration > $max_duration) {
 391                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 392                                 posix_kill($pid["pid"], SIGTERM);
 393
 394                                 // We killed the stale process.
 395                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 396                                 // Additionally we are lowering the priority.
 397                                 dba::update('workerqueue',
 398                                                 array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
 399                                                 array('pid' => $pid["pid"]));
 400                         } else {
 401                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 402                         }
 403                 }
 404         }
 405 }
 406
 407 /**
 408  * @brief Checks if the number of active workers exceeds the given limits
 409  *
 410  * @return bool Are there too much workers running?
 411  */
 412 function poller_too_much_workers() {
 413         $queues = Config::get("system", "worker_queues", 4);
 414
 415         $maxqueues = $queues;
 416
 417         $active = poller_active_workers();
 418
 419         // Decrease the number of workers at higher load
 420         $load = current_load();
 421         if ($load) {
 422                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 423
 424                 $maxworkers = $queues;
 425
 426                 // Some magical mathemathics to reduce the workers
 427                 $exponent = 3;
 428                 $slope = $maxworkers / pow($maxsysload, $exponent);
 429                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 430
 431                 // Create a list of queue entries grouped by their priority
 432                 $listitem = array();
 433
 434                 // Adding all processes with no workerqueue entry
 435                 $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS (SELECT id FROM `workerqueue` WHERE `workerqueue`.`pid` = `process`.`pid`)");
 436                 if ($process = dba::fetch($processes)) {
 437                         $listitem[0] = "0:".$process["running"];
 438                 }
 439                 dba::close($processes);
 440
 441                 // Now adding all processes with workerqueue entries
 442                 $entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 443                 while ($entry = dba::fetch($entries)) {
 444                         $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE `priority` = ?", $entry["priority"]);
 445                         if ($process = dba::fetch($processes)) {
 446                                 $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 447                         }
 448                         dba::close($processes);
 449                 }
 450                 dba::close($entries);
 451
 452                 $processlist = implode(', ', $listitem);
 453
 454                 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
 455                 $entries = $s[0]["total"];
 456
 457                 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
 458                         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 459                         $top_priority = $s[0]["priority"];
 460
 461                         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 462                                 intval($top_priority), dbesc(NULL_DATE));
 463                         $high_running = dbm::is_result($s);
 464
 465                         if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
 466                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 467                                 $queues = $active + 1;
 468                         }
 469                 }
 470
 471                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 472
 473                 // Are there fewer workers running as possible? Then fork a new one.
 474                 if (!Config::get("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
 475                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 476                         $args = array("include/poller.php", "no_cron");
 477                         $a = get_app();
 478                         $a->proc_run($args);
 479                 }
 480         }
 481
 482         return($active >= $queues);
 483 }
 484
 485 /**
 486  * @brief Returns the number of active poller processes
 487  *
 488  * @return integer Number of active poller processes
 489  */
 490 function poller_active_workers() {
 491         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 492
 493         return($workers[0]["processes"]);
 494 }
 495
 496 /**
 497  * @brief Check if we should pass some slow processes
 498  *
 499  * When the active processes of the highest priority are using more than 2/3
 500  * of all processes, we let pass slower processes.
 501  *
 502  * @param string $highest_priority Returns the currently highest priority
 503  * @return bool We let pass a slower process than $highest_priority
 504  */
 505 function poller_passing_slow(&$highest_priority) {
 506
 507         $highest_priority = 0;
 508
 509         $r = q("SELECT `priority`
 510                 FROM `process`
 511                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 512
 513         // No active processes at all? Fine
 514         if (!dbm::is_result($r))
 515                 return(false);
 516
 517         $priorities = array();
 518         foreach ($r AS $line)
 519                 $priorities[] = $line["priority"];
 520
 521         // Should not happen
 522         if (count($priorities) == 0)
 523                 return(false);
 524
 525         $highest_priority = min($priorities);
 526
 527         // The highest process is already the slowest one?
 528         // Then we quit
 529         if ($highest_priority == PRIORITY_NEGLIGIBLE)
 530                 return(false);
 531
 532         $high = 0;
 533         foreach ($priorities AS $priority)
 534                 if ($priority == $highest_priority)
 535                         ++$high;
 536
 537         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 538         $passing_slow = (($high/count($priorities)) > (2/3));
 539
 540         if ($passing_slow)
 541                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 542
 543         return($passing_slow);
 544 }
 545
 546 /**
 547  * @brief Returns the next worker process
 548  *
 549  * @return string SQL statement
 550  */
 551 function poller_worker_process() {
 552
 553         // Check if we should pass some low priority process
 554         $highest_priority = 0;
 555
 556         if (poller_passing_slow($highest_priority)) {
 557                 dba::p('LOCK TABLES `workerqueue` WRITE');
 558
 559                 // Are there waiting processes with a higher priority than the currently highest?
 560                 $r = q("SELECT * FROM `workerqueue`
 561                                 WHERE `executed` <= '%s' AND `priority` < %d
 562                                 ORDER BY `priority`, `created` LIMIT 1",
 563                                 dbesc(NULL_DATE),
 564                                 intval($highest_priority));
 565                 if (dbm::is_result($r)) {
 566                         return $r;
 567                 }
 568                 // Give slower processes some processing time
 569                 $r = q("SELECT * FROM `workerqueue`
 570                                 WHERE `executed` <= '%s' AND `priority` > %d
 571                                 ORDER BY `priority`, `created` LIMIT 1",
 572                                 dbesc(NULL_DATE),
 573                                 intval($highest_priority));
 574
 575                 if (dbm::is_result($r)) {
 576                         return $r;
 577                 }
 578         } else {
 579                 dba::p('LOCK TABLES `workerqueue` WRITE');
 580         }
 581
 582         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 583         if (!dbm::is_result($r)) {
 584                 $r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1", dbesc(NULL_DATE));
 585         }
 586
 587         // We only unlock the tables here, when we got no data
 588         if (!dbm::is_result($r)) {
 589                 dba::p('UNLOCK TABLES');
 590         }
 591
 592         return $r;
 593 }
 594
 595 /**
 596  * @brief Assigns a workerqueue entry to the current process
 597  *
 598  * When we are sure that the table locks are working correctly, we can remove the checks from here
 599  *
 600  * @param array $queue Workerqueue entry
 601  *
 602  * @return boolean "true" if the claiming was successful
 603  */
 604 function poller_claim_process($queue) {
 605         $mypid = getmypid();
 606
 607         $success = dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid),
 608                         array('id' => $queue["id"], 'pid' => 0));
 609         dba::p('UNLOCK TABLES');
 610
 611         if (!$success) {
 612                 logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
 613                 return false;
 614         }
 615
 616         // Assure that there are no tasks executed twice
 617         $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 618         if (!$id) {
 619                 logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
 620                 return false;
 621         } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
 622                 logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
 623                 return false;
 624         } elseif ($id[0]["pid"] != $mypid) {
 625                 logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
 626                 return false;
 627         }
 628         return true;
 629 }
 630
 631 /**
 632  * @brief Removes a workerqueue entry from the current process
 633  */
 634 function poller_unclaim_process() {
 635         $mypid = getmypid();
 636
 637         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
 638 }
 639
 640 /**
 641  * @brief Call the front end worker
 642  */
 643 function call_worker() {
 644         if (!Config::get("system", "frontend_worker")) {
 645                 return;
 646         }
 647
 648         $url = App::get_baseurl()."/worker";
 649         fetch_url($url, false, $redirects, 1);
 650 }
 651
 652 /**
 653  * @brief Call the front end worker if there aren't any active
 654  */
 655 function call_worker_if_idle() {
 656         if (!Config::get("system", "frontend_worker")) {
 657                 return;
 658         }
 659
 660         // Do we have "proc_open"? Then we can fork the poller
 661         if (function_exists("proc_open")) {
 662                 // When was the last time that we called the worker?
 663                 // Less than one minute? Then we quit
 664                 if ((time() - Config::get("system", "worker_started")) < 60) {
 665                         return;
 666                 }
 667
 668                 set_config("system", "worker_started", time());
 669
 670                 // Do we have enough running workers? Then we quit here.
 671                 if (poller_too_much_workers()) {
 672                         // Cleaning dead processes
 673                         poller_kill_stale_workers();
 674                         get_app()->remove_inactive_processes();
 675
 676                         return;
 677                 }
 678
 679                 poller_run_cron();
 680
 681                 logger('Call poller', LOGGER_DEBUG);
 682
 683                 $args = array("include/poller.php", "no_cron");
 684                 $a = get_app();
 685                 $a->proc_run($args);
 686                 return;
 687         }
 688
 689         // We cannot execute background processes.
 690         // We now run the processes from the frontend.
 691         // This won't work with long running processes.
 692         poller_run_cron();
 693
 694         clear_worker_processes();
 695
 696         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 697
 698         if ($workers[0]["processes"] == 0) {
 699                 call_worker();
 700         }
 701 }
 702
 703 /**
 704  * @brief Removes long running worker processes
 705  */
 706 function clear_worker_processes() {
 707         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 708
 709         /// @todo We should clean up the corresponding workerqueue entries as well
 710         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 711                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 712 }
 713
 714 /**
 715  * @brief Runs the cron processes
 716  */
 717 function poller_run_cron() {
 718         logger('Add cron entries', LOGGER_DEBUG);
 719
 720         // Check for spooled items
 721         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 722
 723         // Run the cron job that calls all other jobs
 724         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 725
 726         // Run the cronhooks job separately from cron for being able to use a different timing
 727         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 728
 729         // Cleaning dead processes
 730         poller_kill_stale_workers();
 731 }
 732
 733 if (array_search(__file__,get_included_files())===0){
 734         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 735
 736         Lock::removeAll();
 737
 738         poller_unclaim_process();
 739
 740         get_app()->end_process();
 741
 742         killme();
 743 }