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") && (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         $a->set_baseurl(Config::get('system', 'url'));
  38
  39         load_hooks();
  40
  41         // At first check the maximum load. We shouldn't continue with a high load
  42         if ($a->maxload_reached()) {
  43                 logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
  44                 return;
  45         }
  46
  47         // We now start the process. This is done after the load check since this could increase the load.
  48         $a->start_process();
  49
  50         // Kill stale processes every 5 minutes
  51         $last_cleanup = Config::get('system', 'poller_last_cleaned', 0);
  52         if (time() > ($last_cleanup + 300)) {
  53                 Config::set('system', 'poller_last_cleaned', time());
  54                 poller_kill_stale_workers();
  55         }
  56
  57         // Count active workers and compare them with a maximum value that depends on the load
  58         if (poller_too_much_workers()) {
  59                 logger('Pre check: Active worker limit reached, quitting.', LOGGER_DEBUG);
  60                 return;
  61         }
  62
  63         // Do we have too few memory?
  64         if ($a->min_memory_reached()) {
  65                 logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
  66                 return;
  67         }
  68
  69         // Possibly there are too much database connections
  70         if (poller_max_connections_reached()) {
  71                 logger('Pre check: maximum connections reached, quitting.', LOGGER_DEBUG);
  72                 return;
  73         }
  74
  75         // Possibly there are too much database processes that block the system
  76         if ($a->max_processes_reached()) {
  77                 logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
  78                 return;
  79         }
  80
  81         // Now we start additional cron processes if we should do so
  82         if (($argc <= 1) || ($argv[1] != "no_cron")) {
  83                 poller_run_cron();
  84         }
  85
  86         $starttime = time();
  87
  88         // We fetch the next queue entry that is about to be executed
  89         while ($r = poller_worker_process()) {
  90                 foreach ($r AS $entry) {
  91                         // Assure that the priority is an integer value
  92                         $entry['priority'] = (int)$entry['priority'];
  93
  94                         // The work will be done
  95                         if (!poller_execute($entry)) {
  96                                 logger('Process execution failed, quitting.', LOGGER_DEBUG);
  97                                 return;
  98                         }
  99                 }
 100
 101                 // To avoid the quitting of multiple pollers only one poller at a time will execute the check
 102                 if (Lock::set('poller_worker', 0)) {
 103                         // Count active workers and compare them with a maximum value that depends on the load
 104                         if (poller_too_much_workers()) {
 105                                 logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
 106                                 return;
 107                         }
 108
 109                         // Check free memory
 110                         if ($a->min_memory_reached()) {
 111                                 logger('Memory limit reached, quitting.', LOGGER_DEBUG);
 112                                 return;
 113                         }
 114                         Lock::remove('poller_worker');
 115                 }
 116
 117                 // Quit the poller once every 5 minutes
 118                 if (time() > ($starttime + 300)) {
 119                         logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
 120                         return;
 121                 }
 122         }
 123         logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
 124 }
 125
 126 /**
 127  * @brief Returns the number of non executed entries in the worker queue
 128  *
 129  * @return integer Number of non executed entries in the worker queue
 130  */
 131 function poller_total_entries() {
 132         $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s'", dbesc(NULL_DATE));
 133         if (dbm::is_result($s)) {
 134                 return $s[0]["total"];
 135         } else {
 136                 return 0;
 137         }
 138 }
 139
 140 /**
 141  * @brief Returns the highest priority in the worker queue that isn't executed
 142  *
 143  * @return integer Number of active poller processes
 144  */
 145 function poller_highest_priority() {
 146         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 147         if (dbm::is_result($s)) {
 148                 return $s[0]["priority"];
 149         } else {
 150                 return 0;
 151         }
 152 }
 153
 154 /**
 155  * @brief Returns if a process with the given priority is running
 156  *
 157  * @param integer $priority The priority that should be checked
 158  *
 159  * @return integer Is there a process running with that priority?
 160  */
 161 function poller_process_with_priority_active($priority) {
 162         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 163                         intval($priority), dbesc(NULL_DATE));
 164         return dbm::is_result($s);
 165 }
 166
 167 /**
 168  * @brief Execute a worker entry
 169  *
 170  * @param array $queue Workerqueue entry
 171  *
 172  * @return boolean "true" if further processing should be stopped
 173  */
 174 function poller_execute($queue) {
 175
 176         $a = get_app();
 177
 178         $mypid = getmypid();
 179
 180         // Quit when in maintenance
 181         if (Config::get('system', 'maintenance', true)) {
 182                 logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 183                 return false;
 184         }
 185
 186         // Constantly check the number of parallel database processes
 187         if ($a->max_processes_reached()) {
 188                 logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 189                 return false;
 190         }
 191
 192         // Constantly check the number of available database connections to let the frontend be accessible at any time
 193         if (poller_max_connections_reached()) {
 194                 logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
 195                 return false;
 196         }
 197
 198         $argv = json_decode($queue["parameter"]);
 199
 200         // Check for existance and validity of the include file
 201         $include = $argv[0];
 202
 203         if (!validate_include($include)) {
 204                 logger("Include file ".$argv[0]." is not valid!");
 205                 dba::delete('workerqueue', array('id' => $queue["id"]));
 206                 return true;
 207         }
 208
 209         require_once($include);
 210
 211         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 212
 213         if (function_exists($funcname)) {
 214                 poller_exec_function($queue, $funcname, $argv);
 215                 dba::delete('workerqueue', array('id' => $queue["id"]));
 216         } else {
 217                 logger("Function ".$funcname." does not exist");
 218         }
 219
 220         return true;
 221 }
 222
 223 /**
 224  * @brief Execute a function from the queue
 225  *
 226  * @param array $queue Workerqueue entry
 227  * @param string $funcname name of the function
 228  * @param array $argv Array of values to be passed to the function
 229  */
 230 function poller_exec_function($queue, $funcname, $argv) {
 231
 232         $a = get_app();
 233
 234         $mypid = getmypid();
 235
 236         $argc = count($argv);
 237
 238         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 239
 240         $stamp = (float)microtime(true);
 241
 242         // We use the callstack here to analyze the performance of executed worker entries.
 243         // For this reason the variables have to be initialized.
 244         if (Config::get("system", "profiler")) {
 245                 $a->performance["start"] = microtime(true);
 246                 $a->performance["database"] = 0;
 247                 $a->performance["database_write"] = 0;
 248                 $a->performance["network"] = 0;
 249                 $a->performance["file"] = 0;
 250                 $a->performance["rendering"] = 0;
 251                 $a->performance["parser"] = 0;
 252                 $a->performance["marktime"] = 0;
 253                 $a->performance["markstart"] = microtime(true);
 254                 $a->callstack = array();
 255         }
 256
 257         // For better logging create a new process id for every worker call
 258         // But preserve the old one for the worker
 259         $old_process_id = $a->process_id;
 260         $a->process_id = uniqid("wrk", true);
 261         $a->queue = $queue;
 262
 263         $funcname($argv, $argc);
 264
 265         $a->process_id = $old_process_id;
 266         unset($a->queue);
 267
 268         $duration = number_format(microtime(true) - $stamp, 3);
 269
 270         if ($duration > 3600) {
 271                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 272         } elseif ($duration > 600) {
 273                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 274         } elseif ($duration > 300) {
 275                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 276         } elseif ($duration > 120) {
 277                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 278         }
 279
 280         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 281
 282         // Write down the performance values into the log
 283         if (Config::get("system", "profiler")) {
 284                 $duration = microtime(true)-$a->performance["start"];
 285
 286                 if (Config::get("rendertime", "callstack")) {
 287                         if (isset($a->callstack["database"])) {
 288                                 $o = "\nDatabase Read:\n";
 289                                 foreach ($a->callstack["database"] AS $func => $time) {
 290                                         $time = round($time, 3);
 291                                         if ($time > 0) {
 292                                                 $o .= $func.": ".$time."\n";
 293                                         }
 294                                 }
 295                         }
 296                         if (isset($a->callstack["database_write"])) {
 297                                 $o .= "\nDatabase Write:\n";
 298                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 299                                         $time = round($time, 3);
 300                                         if ($time > 0) {
 301                                                 $o .= $func.": ".$time."\n";
 302                                         }
 303                                 }
 304                         }
 305                         if (isset($a->callstack["network"])) {
 306                                 $o .= "\nNetwork:\n";
 307                                 foreach ($a->callstack["network"] AS $func => $time) {
 308                                         $time = round($time, 3);
 309                                         if ($time > 0) {
 310                                                 $o .= $func.": ".$time."\n";
 311                                         }
 312                                 }
 313                         }
 314                 } else {
 315                         $o = '';
 316                 }
 317
 318                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 319                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 320                         number_format($a->performance["database_write"], 2),
 321                         number_format($a->performance["network"], 2),
 322                         number_format($a->performance["file"], 2),
 323                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 324                         number_format($duration, 2)),
 325                         LOGGER_DEBUG);
 326         }
 327
 328         $cooldown = Config::get("system", "worker_cooldown", 0);
 329
 330         if ($cooldown > 0) {
 331                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 332                 sleep($cooldown);
 333         }
 334 }
 335
 336 /**
 337  * @brief Checks if the number of database connections has reached a critical limit.
 338  *
 339  * @return bool Are more than 3/4 of the maximum connections used?
 340  */
 341 function poller_max_connections_reached() {
 342
 343         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 344         $max = Config::get("system", "max_connections");
 345
 346         // Fetch the percentage level where the poller will get active
 347         $maxlevel = Config::get("system", "max_connections_level", 75);
 348
 349         if ($max == 0) {
 350                 // the maximum number of possible user connections can be a system variable
 351                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 352                 if (dbm::is_result($r)) {
 353                         $max = $r[0]["Value"];
 354                 }
 355                 // Or it can be granted. This overrides the system variable
 356                 $r = q("SHOW GRANTS");
 357                 if (dbm::is_result($r)) {
 358                         foreach ($r AS $grants) {
 359                                 $grant = array_pop($grants);
 360                                 if (stristr($grant, "GRANT USAGE ON")) {
 361                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
 362                                                 $max = $match[1];
 363                                         }
 364                                 }
 365                         }
 366                 }
 367         }
 368
 369         // If $max is set we will use the processlist to determine the current number of connections
 370         // The processlist only shows entries of the current user
 371         if ($max != 0) {
 372                 $r = q("SHOW PROCESSLIST");
 373                 if (!dbm::is_result($r)) {
 374                         return false;
 375                 }
 376                 $used = count($r);
 377
 378                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 379
 380                 $level = ($used / $max) * 100;
 381
 382                 if ($level >= $maxlevel) {
 383                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 384                         return true;
 385                 }
 386         }
 387
 388         // We will now check for the system values.
 389         // This limit could be reached although the user limits are fine.
 390         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 391         if (!dbm::is_result($r)) {
 392                 return false;
 393         }
 394         $max = intval($r[0]["Value"]);
 395         if ($max == 0) {
 396                 return false;
 397         }
 398         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 399         if (!dbm::is_result($r)) {
 400                 return false;
 401         }
 402         $used = intval($r[0]["Value"]);
 403         if ($used == 0) {
 404                 return false;
 405         }
 406         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 407
 408         $level = $used / $max * 100;
 409
 410         if ($level < $maxlevel) {
 411                 return false;
 412         }
 413         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 414         return true;
 415 }
 416
 417 /**
 418  * @brief fix the queue entry if the worker process died
 419  *
 420  */
 421 function poller_kill_stale_workers() {
 422         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 423
 424         if (!dbm::is_result($r)) {
 425                 // No processing here needed
 426                 return;
 427         }
 428
 429         foreach ($r AS $pid) {
 430                 if (!posix_kill($pid["pid"], 0)) {
 431                         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
 432                                         array('pid' => $pid["pid"]));
 433                 } else {
 434                         // Kill long running processes
 435
 436                         // Check if the priority is in a valid range
 437                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
 438                                 $pid["priority"] = PRIORITY_MEDIUM;
 439                         }
 440
 441                         // Define the maximum durations
 442                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 443                         $max_duration = $max_duration_defaults[$pid["priority"]];
 444
 445                         $argv = json_decode($pid["parameter"]);
 446                         $argv[0] = basename($argv[0]);
 447
 448                         // How long is the process already running?
 449                         $duration = (time() - strtotime($pid["executed"])) / 60;
 450                         if ($duration > $max_duration) {
 451                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 452                                 posix_kill($pid["pid"], SIGTERM);
 453
 454                                 // We killed the stale process.
 455                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 456                                 // Additionally we are lowering the priority.
 457                                 dba::update('workerqueue',
 458                                                 array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
 459                                                 array('pid' => $pid["pid"]));
 460                         } else {
 461                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 462                         }
 463                 }
 464         }
 465 }
 466
 467 /**
 468  * @brief Checks if the number of active workers exceeds the given limits
 469  *
 470  * @return bool Are there too much workers running?
 471  */
 472 function poller_too_much_workers() {
 473         $queues = Config::get("system", "worker_queues", 4);
 474
 475         $maxqueues = $queues;
 476
 477         $active = poller_active_workers();
 478
 479         // Decrease the number of workers at higher load
 480         $load = current_load();
 481         if ($load) {
 482                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 483
 484                 $maxworkers = $queues;
 485
 486                 // Some magical mathemathics to reduce the workers
 487                 $exponent = 3;
 488                 $slope = $maxworkers / pow($maxsysload, $exponent);
 489                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 490
 491                 if (Config::get('system', 'worker_debug')) {
 492                         // Create a list of queue entries grouped by their priority
 493                         $listitem = array();
 494
 495                         // Adding all processes with no workerqueue entry
 496                         $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS (SELECT id FROM `workerqueue` WHERE `workerqueue`.`pid` = `process`.`pid`)");
 497                         if ($process = dba::fetch($processes)) {
 498                                 $listitem[0] = "0:".$process["running"];
 499                         }
 500                         dba::close($processes);
 501
 502                         // Now adding all processes with workerqueue entries
 503                         $entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 504                         while ($entry = dba::fetch($entries)) {
 505                                 $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE `priority` = ?", $entry["priority"]);
 506                                 if ($process = dba::fetch($processes)) {
 507                                         $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 508                                 }
 509                                 dba::close($processes);
 510                         }
 511                         dba::close($entries);
 512                         $processlist = ' ('.implode(', ', $listitem).')';
 513                 }
 514
 515                 $entries = poller_total_entries();
 516
 517                 if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
 518                         $top_priority = poller_highest_priority();
 519                         $high_running = poller_process_with_priority_active($top_priority);
 520
 521                         if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
 522                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 523                                 $queues = $active + 1;
 524                         }
 525                 }
 526
 527                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 528
 529                 // Are there fewer workers running as possible? Then fork a new one.
 530                 if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
 531                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 532                         $args = array("include/poller.php", "no_cron");
 533                         $a = get_app();
 534                         $a->proc_run($args);
 535                 }
 536         }
 537
 538         return $active >= $queues;
 539 }
 540
 541 /**
 542  * @brief Returns the number of active poller processes
 543  *
 544  * @return integer Number of active poller processes
 545  */
 546 function poller_active_workers() {
 547         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 548
 549         return $workers[0]["processes"];
 550 }
 551
 552 /**
 553  * @brief Check if we should pass some slow processes
 554  *
 555  * When the active processes of the highest priority are using more than 2/3
 556  * of all processes, we let pass slower processes.
 557  *
 558  * @param string $highest_priority Returns the currently highest priority
 559  * @return bool We let pass a slower process than $highest_priority
 560  */
 561 function poller_passing_slow(&$highest_priority) {
 562
 563         $highest_priority = 0;
 564
 565         $r = q("SELECT `priority`
 566                 FROM `process`
 567                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 568
 569         // No active processes at all? Fine
 570         if (!dbm::is_result($r)) {
 571                 return false;
 572         }
 573         $priorities = array();
 574         foreach ($r AS $line) {
 575                 $priorities[] = $line["priority"];
 576         }
 577         // Should not happen
 578         if (count($priorities) == 0) {
 579                 return false;
 580         }
 581         $highest_priority = min($priorities);
 582
 583         // The highest process is already the slowest one?
 584         // Then we quit
 585         if ($highest_priority == PRIORITY_NEGLIGIBLE) {
 586                 return false;
 587         }
 588         $high = 0;
 589         foreach ($priorities AS $priority) {
 590                 if ($priority == $highest_priority) {
 591                         ++$high;
 592                 }
 593         }
 594         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 595         $passing_slow = (($high/count($priorities)) > (2/3));
 596
 597         if ($passing_slow) {
 598                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 599         }
 600         return $passing_slow;
 601 }
 602
 603 /**
 604  * @brief Find and claim the next worker process for us
 605  *
 606  * @return boolean Have we found something?
 607  */
 608 function find_worker_processes() {
 609         // Check if we should pass some low priority process
 610         $highest_priority = 0;
 611         $found = false;
 612
 613         if (poller_passing_slow($highest_priority)) {
 614                 // Are there waiting processes with a higher priority than the currently highest?
 615                 $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 616                                         WHERE `executed` <= ? AND `priority` < ?
 617                                         ORDER BY `priority`, `created` LIMIT 5",
 618                                 datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 619                 if ($result) {
 620                         $found = (dba::affected_rows() > 0);
 621                 }
 622
 623                 if (!$found) {
 624                         // Give slower processes some processing time
 625                         $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 626                                                 WHERE `executed` <= ? AND `priority` > ?
 627                                                 ORDER BY `priority`, `created` LIMIT 1",
 628                                         datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 629                         if ($result) {
 630                                 $found = (dba::affected_rows() > 0);
 631                         }
 632                 }
 633         }
 634
 635         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 636         if (!$found) {
 637                 $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ? WHERE `executed` <= ? ORDER BY `priority`, `created` LIMIT 5",
 638                                 datetime_convert(), getmypid(), NULL_DATE);
 639                 if ($result) {
 640                         $found = (dba::affected_rows() > 0);
 641                 }
 642         }
 643         return $found;
 644 }
 645
 646 /**
 647  * @brief Returns the next worker process
 648  *
 649  * @return string SQL statement
 650  */
 651 function poller_worker_process() {
 652
 653         $stamp = (float)microtime(true);
 654
 655         $found = find_worker_processes();
 656
 657         logger('Duration: '.number_format(microtime(true) - $stamp, 3), LOGGER_DEBUG);
 658
 659         if ($found) {
 660                 $r = q("SELECT * FROM `workerqueue` WHERE `pid` = %d", intval(getmypid()));
 661         }
 662         return $r;
 663 }
 664
 665 /**
 666  * @brief Removes a workerqueue entry from the current process
 667  */
 668 function poller_unclaim_process() {
 669         $mypid = getmypid();
 670
 671         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
 672 }
 673
 674 /**
 675  * @brief Call the front end worker
 676  */
 677 function call_worker() {
 678         if (!Config::get("system", "frontend_worker")) {
 679                 return;
 680         }
 681
 682         $url = App::get_baseurl()."/worker";
 683         fetch_url($url, false, $redirects, 1);
 684 }
 685
 686 /**
 687  * @brief Call the front end worker if there aren't any active
 688  */
 689 function call_worker_if_idle() {
 690         if (!Config::get("system", "frontend_worker")) {
 691                 return;
 692         }
 693
 694         // Do we have "proc_open"? Then we can fork the poller
 695         if (function_exists("proc_open")) {
 696                 // When was the last time that we called the worker?
 697                 // Less than one minute? Then we quit
 698                 if ((time() - Config::get("system", "worker_started")) < 60) {
 699                         return;
 700                 }
 701
 702                 set_config("system", "worker_started", time());
 703
 704                 // Do we have enough running workers? Then we quit here.
 705                 if (poller_too_much_workers()) {
 706                         // Cleaning dead processes
 707                         poller_kill_stale_workers();
 708                         get_app()->remove_inactive_processes();
 709
 710                         return;
 711                 }
 712
 713                 poller_run_cron();
 714
 715                 logger('Call poller', LOGGER_DEBUG);
 716
 717                 $args = array("include/poller.php", "no_cron");
 718                 $a = get_app();
 719                 $a->proc_run($args);
 720                 return;
 721         }
 722
 723         // We cannot execute background processes.
 724         // We now run the processes from the frontend.
 725         // This won't work with long running processes.
 726         poller_run_cron();
 727
 728         clear_worker_processes();
 729
 730         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 731
 732         if ($workers[0]["processes"] == 0) {
 733                 call_worker();
 734         }
 735 }
 736
 737 /**
 738  * @brief Removes long running worker processes
 739  */
 740 function clear_worker_processes() {
 741         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 742
 743         /// @todo We should clean up the corresponding workerqueue entries as well
 744         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 745                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 746 }
 747
 748 /**
 749  * @brief Runs the cron processes
 750  */
 751 function poller_run_cron() {
 752         logger('Add cron entries', LOGGER_DEBUG);
 753
 754         // Check for spooled items
 755         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 756
 757         // Run the cron job that calls all other jobs
 758         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 759
 760         // Run the cronhooks job separately from cron for being able to use a different timing
 761         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 762
 763         // Cleaning dead processes
 764         poller_kill_stale_workers();
 765 }
 766
 767 if (array_search(__file__,get_included_files())===0){
 768         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 769
 770         poller_unclaim_process();
 771
 772         get_app()->end_process();
 773
 774         Lock::remove('poller_worker');
 775
 776         killme();
 777 }