include/poller.php

   1 <?php
   2
   3 use Friendica\App;
   4 use Friendica\Core\Config;
   5
   6 if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
   7         $directory = dirname($_SERVER["argv"][0]);
   8
   9         if (substr($directory, 0, 1) != "/")
  10                 $directory = $_SERVER["PWD"]."/".$directory;
  11
  12         $directory = realpath($directory."/..");
  13
  14         chdir($directory);
  15 }
  16
  17 require_once("boot.php");
  18
  19 function poller_run($argv, $argc){
  20         global $a, $db;
  21
  22         if (is_null($a)) {
  23                 $a = new App(dirname(__DIR__));
  24         }
  25
  26         if (is_null($db)) {
  27                 @include(".htconfig.php");
  28                 require_once("include/dba.php");
  29                 $db = new dba($db_host, $db_user, $db_pass, $db_data);
  30                 unset($db_host, $db_user, $db_pass, $db_data);
  31         };
  32
  33         Config::load();
  34
  35         // Quit when in maintenance
  36         if (Config::get('system', 'maintenance', true)) {
  37                 return;
  38         }
  39
  40         $a->set_baseurl(Config::get('system', 'url'));
  41
  42         load_hooks();
  43
  44         $a->start_process();
  45
  46         if ($a->min_memory_reached()) {
  47                 return;
  48         }
  49
  50         if (poller_max_connections_reached()) {
  51                 return;
  52         }
  53
  54         if ($a->maxload_reached()) {
  55                 return;
  56         }
  57
  58         if (($argc <= 1) OR ($argv[1] != "no_cron")) {
  59                 poller_run_cron();
  60         }
  61
  62         if ($a->max_processes_reached()) {
  63                 return;
  64         }
  65
  66         // Checking the number of workers
  67         if (poller_too_much_workers()) {
  68                 poller_kill_stale_workers();
  69                 return;
  70         }
  71
  72         $starttime = time();
  73
  74         while ($r = poller_worker_process()) {
  75
  76                 if (!poller_claim_process($r[0])) {
  77                         continue;
  78                 }
  79
  80                 // Check free memory
  81                 if ($a->min_memory_reached()) {
  82                         logger('Memory limit reached, quitting.', LOGGER_DEBUG);
  83                         return;
  84                 }
  85
  86                 // Count active workers and compare them with a maximum value that depends on the load
  87                 if (poller_too_much_workers()) {
  88                         logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
  89                         return;
  90                 }
  91
  92                 if (!poller_execute($r[0])) {
  93                         logger('Process execution failed, quitting.', LOGGER_DEBUG);
  94                         return;
  95                 }
  96
  97                 // Quit the poller once every hour
  98                 if (time() > ($starttime + 3600)) {
  99                         logger('Process lifetime reachted, quitting.', LOGGER_DEBUG);
 100                         return;
 101                 }
 102         }
 103         logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
 104 }
 105
 106 /**
 107  * @brief Execute a worker entry
 108  *
 109  * @param array $queue Workerqueue entry
 110  *
 111  * @return boolean "true" if further processing should be stopped
 112  */
 113 function poller_execute($queue) {
 114
 115         $a = get_app();
 116
 117         $mypid = getmypid();
 118
 119         // Quit when in maintenance
 120         if (Config::get('system', 'maintenance', true)) {
 121                 logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 122                 return false;
 123         }
 124
 125         // Constantly check the number of parallel database processes
 126         if ($a->max_processes_reached()) {
 127                 logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 128                 return false;
 129         }
 130
 131         // Constantly check the number of available database connections to let the frontend be accessible at any time
 132         if (poller_max_connections_reached()) {
 133                 logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
 134                 return false;
 135         }
 136
 137         $argv = json_decode($queue["parameter"]);
 138
 139         // Check for existance and validity of the include file
 140         $include = $argv[0];
 141
 142         if (!validate_include($include)) {
 143                 logger("Include file ".$argv[0]." is not valid!");
 144                 dba::delete('workerqueue', array('id' => $queue["id"]));
 145                 return true;
 146         }
 147
 148         require_once($include);
 149
 150         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 151
 152         if (function_exists($funcname)) {
 153
 154                 poller_exec_function($queue, $funcname, $argv);
 155                 dba::delete('workerqueue', array('id' => $queue["id"]));
 156         } else {
 157                 logger("Function ".$funcname." does not exist");
 158         }
 159
 160         return true;
 161 }
 162
 163 /**
 164  * @brief Execute a function from the queue
 165  *
 166  * @param array $queue Workerqueue entry
 167  * @param string $funcname name of the function
 168  * @param array $argv Array of values to be passed to the function
 169  */
 170 function poller_exec_function($queue, $funcname, $argv) {
 171
 172         $a = get_app();
 173
 174         $mypid = getmypid();
 175
 176         $argc = count($argv);
 177
 178         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 179
 180         $stamp = (float)microtime(true);
 181
 182         // We use the callstack here to analyze the performance of executed worker entries.
 183         // For this reason the variables have to be initialized.
 184         if (Config::get("system", "profiler")) {
 185                 $a->performance["start"] = microtime(true);
 186                 $a->performance["database"] = 0;
 187                 $a->performance["database_write"] = 0;
 188                 $a->performance["network"] = 0;
 189                 $a->performance["file"] = 0;
 190                 $a->performance["rendering"] = 0;
 191                 $a->performance["parser"] = 0;
 192                 $a->performance["marktime"] = 0;
 193                 $a->performance["markstart"] = microtime(true);
 194                 $a->callstack = array();
 195         }
 196
 197         // For better logging create a new process id for every worker call
 198         // But preserve the old one for the worker
 199         $old_process_id = $a->process_id;
 200         $a->process_id = uniqid("wrk", true);
 201
 202         $funcname($argv, $argc);
 203
 204         $a->process_id = $old_process_id;
 205
 206         $duration = number_format(microtime(true) - $stamp, 3);
 207
 208         if ($duration > 3600) {
 209                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 210         } elseif ($duration > 600) {
 211                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 212         } elseif ($duration > 300) {
 213                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 214         } elseif ($duration > 120) {
 215                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 216         }
 217
 218         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 219
 220         // Write down the performance values into the log
 221         if (Config::get("system", "profiler")) {
 222                 $duration = microtime(true)-$a->performance["start"];
 223
 224                 if (Config::get("rendertime", "callstack")) {
 225                         if (isset($a->callstack["database"])) {
 226                                 $o = "\nDatabase Read:\n";
 227                                 foreach ($a->callstack["database"] AS $func => $time) {
 228                                         $time = round($time, 3);
 229                                         if ($time > 0)
 230                                                 $o .= $func.": ".$time."\n";
 231                                 }
 232                         }
 233                         if (isset($a->callstack["database_write"])) {
 234                                 $o .= "\nDatabase Write:\n";
 235                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 236                                         $time = round($time, 3);
 237                                         if ($time > 0)
 238                                                 $o .= $func.": ".$time."\n";
 239                                 }
 240                         }
 241                         if (isset($a->callstack["network"])) {
 242                                 $o .= "\nNetwork:\n";
 243                                 foreach ($a->callstack["network"] AS $func => $time) {
 244                                         $time = round($time, 3);
 245                                         if ($time > 0)
 246                                                 $o .= $func.": ".$time."\n";
 247                                 }
 248                         }
 249                 } else {
 250                         $o = '';
 251                 }
 252
 253                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 254                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 255                         number_format($a->performance["database_write"], 2),
 256                         number_format($a->performance["network"], 2),
 257                         number_format($a->performance["file"], 2),
 258                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 259                         number_format($duration, 2)),
 260                         LOGGER_DEBUG);
 261         }
 262
 263         $cooldown = Config::get("system", "worker_cooldown", 0);
 264
 265         if ($cooldown > 0) {
 266                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 267                 sleep($cooldown);
 268         }
 269 }
 270
 271 /**
 272  * @brief Checks if the number of database connections has reached a critical limit.
 273  *
 274  * @return bool Are more than 3/4 of the maximum connections used?
 275  */
 276 function poller_max_connections_reached() {
 277
 278         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 279         $max = Config::get("system", "max_connections");
 280
 281         // Fetch the percentage level where the poller will get active
 282         $maxlevel = Config::get("system", "max_connections_level", 75);
 283
 284         if ($max == 0) {
 285                 // the maximum number of possible user connections can be a system variable
 286                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 287                 if ($r)
 288                         $max = $r[0]["Value"];
 289
 290                 // Or it can be granted. This overrides the system variable
 291                 $r = q("SHOW GRANTS");
 292                 if ($r)
 293                         foreach ($r AS $grants) {
 294                                 $grant = array_pop($grants);
 295                                 if (stristr($grant, "GRANT USAGE ON"))
 296                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
 297                                                 $max = $match[1];
 298                         }
 299         }
 300
 301         // If $max is set we will use the processlist to determine the current number of connections
 302         // The processlist only shows entries of the current user
 303         if ($max != 0) {
 304                 $r = q("SHOW PROCESSLIST");
 305                 if (!dbm::is_result($r))
 306                         return false;
 307
 308                 $used = count($r);
 309
 310                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 311
 312                 $level = ($used / $max) * 100;
 313
 314                 if ($level >= $maxlevel) {
 315                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 316                         return true;
 317                 }
 318         }
 319
 320         // We will now check for the system values.
 321         // This limit could be reached although the user limits are fine.
 322         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 323         if (!$r)
 324                 return false;
 325
 326         $max = intval($r[0]["Value"]);
 327         if ($max == 0)
 328                 return false;
 329
 330         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 331         if (!$r)
 332                 return false;
 333
 334         $used = intval($r[0]["Value"]);
 335         if ($used == 0)
 336                 return false;
 337
 338         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 339
 340         $level = $used / $max * 100;
 341
 342         if ($level < $maxlevel)
 343                 return false;
 344
 345         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 346         return true;
 347 }
 348
 349 /**
 350  * @brief fix the queue entry if the worker process died
 351  *
 352  */
 353 function poller_kill_stale_workers() {
 354         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 355
 356         if (!dbm::is_result($r)) {
 357                 // No processing here needed
 358                 return;
 359         }
 360
 361         foreach ($r AS $pid) {
 362                 if (!posix_kill($pid["pid"], 0)) {
 363                         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
 364                                         array('pid' => $pid["pid"]));
 365                 } else {
 366                         // Kill long running processes
 367
 368                         // Check if the priority is in a valid range
 369                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
 370                                 $pid["priority"] = PRIORITY_MEDIUM;
 371                         }
 372
 373                         // Define the maximum durations
 374                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 375                         $max_duration = $max_duration_defaults[$pid["priority"]];
 376
 377                         $argv = json_decode($pid["parameter"]);
 378                         $argv[0] = basename($argv[0]);
 379
 380                         // How long is the process already running?
 381                         $duration = (time() - strtotime($pid["executed"])) / 60;
 382                         if ($duration > $max_duration) {
 383                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 384                                 posix_kill($pid["pid"], SIGTERM);
 385
 386                                 // We killed the stale process.
 387                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 388                                 // Additionally we are lowering the priority.
 389                                 dba::update('workerqueue',
 390                                                 array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
 391                                                 array('pid' => $pid["pid"]));
 392                         } else {
 393                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 394                         }
 395                 }
 396         }
 397 }
 398
 399 /**
 400  * @brief Checks if the number of active workers exceeds the given limits
 401  *
 402  * @return bool Are there too much workers running?
 403  */
 404 function poller_too_much_workers() {
 405         $queues = Config::get("system", "worker_queues", 4);
 406
 407         $maxqueues = $queues;
 408
 409         $active = poller_active_workers();
 410
 411         // Decrease the number of workers at higher load
 412         $load = current_load();
 413         if ($load) {
 414                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 415
 416                 $maxworkers = $queues;
 417
 418                 // Some magical mathemathics to reduce the workers
 419                 $exponent = 3;
 420                 $slope = $maxworkers / pow($maxsysload, $exponent);
 421                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 422
 423                 // Create a list of queue entries grouped by their priority
 424                 $listitem = array();
 425
 426                 // Adding all processes with no workerqueue entry
 427                 $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS (SELECT id FROM `workerqueue` WHERE `workerqueue`.`pid` = `process`.`pid`)");
 428                 if ($process = dba::fetch($processes)) {
 429                         $listitem[0] = "0:".$process["running"];
 430                 }
 431                 dba::close($processes);
 432
 433                 // Now adding all processes with workerqueue entries
 434                 $entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 435                 while ($entry = dba::fetch($entries)) {
 436                         $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE `priority` = ?", $entry["priority"]);
 437                         if ($process = dba::fetch($processes)) {
 438                                 $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 439                         }
 440                         dba::close($processes);
 441                 }
 442                 dba::close($entries);
 443
 444                 $processlist = implode(', ', $listitem);
 445
 446                 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
 447                 $entries = $s[0]["total"];
 448
 449                 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
 450                         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 451                         $top_priority = $s[0]["priority"];
 452
 453                         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 454                                 intval($top_priority), dbesc(NULL_DATE));
 455                         $high_running = dbm::is_result($s);
 456
 457                         if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
 458                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 459                                 $queues = $active + 1;
 460                         }
 461                 }
 462
 463                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 464
 465                 // Are there fewer workers running as possible? Then fork a new one.
 466                 if (!Config::get("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
 467                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 468                         $args = array("include/poller.php", "no_cron");
 469                         $a = get_app();
 470                         $a->proc_run($args);
 471                 }
 472         }
 473
 474         return($active >= $queues);
 475 }
 476
 477 /**
 478  * @brief Returns the number of active poller processes
 479  *
 480  * @return integer Number of active poller processes
 481  */
 482 function poller_active_workers() {
 483         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 484
 485         return($workers[0]["processes"]);
 486 }
 487
 488 /**
 489  * @brief Check if we should pass some slow processes
 490  *
 491  * When the active processes of the highest priority are using more than 2/3
 492  * of all processes, we let pass slower processes.
 493  *
 494  * @param string $highest_priority Returns the currently highest priority
 495  * @return bool We let pass a slower process than $highest_priority
 496  */
 497 function poller_passing_slow(&$highest_priority) {
 498
 499         $highest_priority = 0;
 500
 501         $r = q("SELECT `priority`
 502                 FROM `process`
 503                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 504
 505         // No active processes at all? Fine
 506         if (!dbm::is_result($r))
 507                 return(false);
 508
 509         $priorities = array();
 510         foreach ($r AS $line)
 511                 $priorities[] = $line["priority"];
 512
 513         // Should not happen
 514         if (count($priorities) == 0)
 515                 return(false);
 516
 517         $highest_priority = min($priorities);
 518
 519         // The highest process is already the slowest one?
 520         // Then we quit
 521         if ($highest_priority == PRIORITY_NEGLIGIBLE)
 522                 return(false);
 523
 524         $high = 0;
 525         foreach ($priorities AS $priority)
 526                 if ($priority == $highest_priority)
 527                         ++$high;
 528
 529         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 530         $passing_slow = (($high/count($priorities)) > (2/3));
 531
 532         if ($passing_slow)
 533                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 534
 535         return($passing_slow);
 536 }
 537
 538 /**
 539  * @brief Returns the next worker process
 540  *
 541  * @return string SQL statement
 542  */
 543 function poller_worker_process() {
 544
 545         // Check if we should pass some low priority process
 546         $highest_priority = 0;
 547
 548         if (poller_passing_slow($highest_priority)) {
 549                 dba::e('LOCK TABLES `workerqueue` WRITE');
 550
 551                 // Are there waiting processes with a higher priority than the currently highest?
 552                 $r = q("SELECT * FROM `workerqueue`
 553                                 WHERE `executed` <= '%s' AND `priority` < %d
 554                                 ORDER BY `priority`, `created` LIMIT 1",
 555                                 dbesc(NULL_DATE),
 556                                 intval($highest_priority));
 557                 if (dbm::is_result($r)) {
 558                         return $r;
 559                 }
 560                 // Give slower processes some processing time
 561                 $r = q("SELECT * FROM `workerqueue`
 562                                 WHERE `executed` <= '%s' AND `priority` > %d
 563                                 ORDER BY `priority`, `created` LIMIT 1",
 564                                 dbesc(NULL_DATE),
 565                                 intval($highest_priority));
 566
 567                 if (dbm::is_result($r)) {
 568                         return $r;
 569                 }
 570         } else {
 571                 dba::e('LOCK TABLES `workerqueue` WRITE');
 572         }
 573
 574         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 575         if (!dbm::is_result($r)) {
 576                 $r = q("SELECT * FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority`, `created` LIMIT 1", dbesc(NULL_DATE));
 577         }
 578
 579         // We only unlock the tables here, when we got no data
 580         if (!dbm::is_result($r)) {
 581                 dba::e('UNLOCK TABLES');
 582         }
 583
 584         return $r;
 585 }
 586
 587 /**
 588  * @brief Assigns a workerqueue entry to the current process
 589  *
 590  * When we are sure that the table locks are working correctly, we can remove the checks from here
 591  *
 592  * @param array $queue Workerqueue entry
 593  *
 594  * @return boolean "true" if the claiming was successful
 595  */
 596 function poller_claim_process($queue) {
 597         $mypid = getmypid();
 598
 599         $success = dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid),
 600                         array('id' => $queue["id"], 'pid' => 0));
 601         dba::e('UNLOCK TABLES');
 602
 603         if (!$success) {
 604                 logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
 605                 return false;
 606         }
 607
 608         // Assure that there are no tasks executed twice
 609         $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
 610         if (!$id) {
 611                 logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
 612                 return false;
 613         } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
 614                 logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
 615                 return false;
 616         } elseif ($id[0]["pid"] != $mypid) {
 617                 logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
 618                 return false;
 619         }
 620         return true;
 621 }
 622
 623 /**
 624  * @brief Removes a workerqueue entry from the current process
 625  */
 626 function poller_unclaim_process() {
 627         $mypid = getmypid();
 628
 629         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
 630 }
 631
 632 /**
 633  * @brief Call the front end worker
 634  */
 635 function call_worker() {
 636         if (!Config::get("system", "frontend_worker")) {
 637                 return;
 638         }
 639
 640         $url = App::get_baseurl()."/worker";
 641         fetch_url($url, false, $redirects, 1);
 642 }
 643
 644 /**
 645  * @brief Call the front end worker if there aren't any active
 646  */
 647 function call_worker_if_idle() {
 648         if (!Config::get("system", "frontend_worker")) {
 649                 return;
 650         }
 651
 652         // Do we have "proc_open"? Then we can fork the poller
 653         if (function_exists("proc_open")) {
 654                 // When was the last time that we called the worker?
 655                 // Less than one minute? Then we quit
 656                 if ((time() - Config::get("system", "worker_started")) < 60) {
 657                         return;
 658                 }
 659
 660                 set_config("system", "worker_started", time());
 661
 662                 // Do we have enough running workers? Then we quit here.
 663                 if (poller_too_much_workers()) {
 664                         // Cleaning dead processes
 665                         poller_kill_stale_workers();
 666                         get_app()->remove_inactive_processes();
 667
 668                         return;
 669                 }
 670
 671                 poller_run_cron();
 672
 673                 logger('Call poller', LOGGER_DEBUG);
 674
 675                 $args = array("include/poller.php", "no_cron");
 676                 $a = get_app();
 677                 $a->proc_run($args);
 678                 return;
 679         }
 680
 681         // We cannot execute background processes.
 682         // We now run the processes from the frontend.
 683         // This won't work with long running processes.
 684         poller_run_cron();
 685
 686         clear_worker_processes();
 687
 688         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 689
 690         if ($workers[0]["processes"] == 0) {
 691                 call_worker();
 692         }
 693 }
 694
 695 /**
 696  * @brief Removes long running worker processes
 697  */
 698 function clear_worker_processes() {
 699         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 700
 701         /// @todo We should clean up the corresponding workerqueue entries as well
 702         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 703                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 704 }
 705
 706 /**
 707  * @brief Runs the cron processes
 708  */
 709 function poller_run_cron() {
 710         logger('Add cron entries', LOGGER_DEBUG);
 711
 712         // Check for spooled items
 713         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 714
 715         // Run the cron job that calls all other jobs
 716         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 717
 718         // Run the cronhooks job separately from cron for being able to use a different timing
 719         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 720
 721         // Cleaning dead processes
 722         poller_kill_stale_workers();
 723 }
 724
 725 if (array_search(__file__,get_included_files())===0){
 726         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 727
 728         poller_unclaim_process();
 729
 730         get_app()->end_process();
 731
 732         killme();
 733 }