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($entry)) {
  96                                 logger('Process execution failed, quitting.', LOGGER_DEBUG);
  97                                 return;
  98                         }
  99
 100                         // To avoid the quitting of multiple pollers only one poller at a time will execute the check
 101                         if (Lock::set('poller_worker', 0)) {
 102                                 // Count active workers and compare them with a maximum value that depends on the load
 103                                 if (poller_too_much_workers()) {
 104                                         logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
 105                                         return;
 106                                 }
 107
 108                                 // Check free memory
 109                                 if ($a->min_memory_reached()) {
 110                                         logger('Memory limit reached, quitting.', LOGGER_DEBUG);
 111                                         return;
 112                                 }
 113                                 Lock::remove('poller_worker');
 114                         }
 115                 }
 116
 117                 // Quit the poller once every hour
 118                 if (time() > ($starttime + 3600)) {
 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         return $s[0]["total"];
 134 }
 135
 136 /**
 137  * @brief Returns the highest priority in the worker queue that isn't executed
 138  *
 139  * @return integer Number of active poller processes
 140  */
 141 function poller_highest_priority() {
 142         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 143         return $s[0]["priority"];
 144 }
 145
 146 /**
 147  * @brief Returns if a process with the given priority is running
 148  *
 149  * @param integer $priority The priority that should be checked
 150  *
 151  * @return integer Is there a process running with that priority?
 152  */
 153 function poller_process_with_priority_active($priority) {
 154         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' LIMIT 1",
 155                         intval($priority), dbesc(NULL_DATE));
 156         return dbm::is_result($s);
 157 }
 158
 159 /**
 160  * @brief Execute a worker entry
 161  *
 162  * @param array $queue Workerqueue entry
 163  *
 164  * @return boolean "true" if further processing should be stopped
 165  */
 166 function poller_execute($queue) {
 167
 168         $a = get_app();
 169
 170         $mypid = getmypid();
 171
 172         // Quit when in maintenance
 173         if (Config::get('system', 'maintenance', true)) {
 174                 logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 175                 return false;
 176         }
 177
 178         // Constantly check the number of parallel database processes
 179         if ($a->max_processes_reached()) {
 180                 logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 181                 return false;
 182         }
 183
 184         // Constantly check the number of available database connections to let the frontend be accessible at any time
 185         if (poller_max_connections_reached()) {
 186                 logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
 187                 return false;
 188         }
 189
 190         $argv = json_decode($queue["parameter"]);
 191
 192         // Check for existance and validity of the include file
 193         $include = $argv[0];
 194
 195         if (!validate_include($include)) {
 196                 logger("Include file ".$argv[0]." is not valid!");
 197                 dba::delete('workerqueue', array('id' => $queue["id"]));
 198                 return true;
 199         }
 200
 201         require_once($include);
 202
 203         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 204
 205         if (function_exists($funcname)) {
 206                 poller_exec_function($queue, $funcname, $argv);
 207                 dba::delete('workerqueue', array('id' => $queue["id"]));
 208         } else {
 209                 logger("Function ".$funcname." does not exist");
 210         }
 211
 212         return true;
 213 }
 214
 215 /**
 216  * @brief Execute a function from the queue
 217  *
 218  * @param array $queue Workerqueue entry
 219  * @param string $funcname name of the function
 220  * @param array $argv Array of values to be passed to the function
 221  */
 222 function poller_exec_function($queue, $funcname, $argv) {
 223
 224         $a = get_app();
 225
 226         $mypid = getmypid();
 227
 228         $argc = count($argv);
 229
 230         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 231
 232         $stamp = (float)microtime(true);
 233
 234         // We use the callstack here to analyze the performance of executed worker entries.
 235         // For this reason the variables have to be initialized.
 236         if (Config::get("system", "profiler")) {
 237                 $a->performance["start"] = microtime(true);
 238                 $a->performance["database"] = 0;
 239                 $a->performance["database_write"] = 0;
 240                 $a->performance["network"] = 0;
 241                 $a->performance["file"] = 0;
 242                 $a->performance["rendering"] = 0;
 243                 $a->performance["parser"] = 0;
 244                 $a->performance["marktime"] = 0;
 245                 $a->performance["markstart"] = microtime(true);
 246                 $a->callstack = array();
 247         }
 248
 249         // For better logging create a new process id for every worker call
 250         // But preserve the old one for the worker
 251         $old_process_id = $a->process_id;
 252         $a->process_id = uniqid("wrk", true);
 253         $a->queue = $queue;
 254
 255         $funcname($argv, $argc);
 256
 257         $a->process_id = $old_process_id;
 258         unset($a->queue);
 259
 260         $duration = number_format(microtime(true) - $stamp, 3);
 261
 262         if ($duration > 3600) {
 263                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 264         } elseif ($duration > 600) {
 265                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 266         } elseif ($duration > 300) {
 267                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 268         } elseif ($duration > 120) {
 269                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 270         }
 271
 272         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 273
 274         // Write down the performance values into the log
 275         if (Config::get("system", "profiler")) {
 276                 $duration = microtime(true)-$a->performance["start"];
 277
 278                 if (Config::get("rendertime", "callstack")) {
 279                         if (isset($a->callstack["database"])) {
 280                                 $o = "\nDatabase Read:\n";
 281                                 foreach ($a->callstack["database"] AS $func => $time) {
 282                                         $time = round($time, 3);
 283                                         if ($time > 0) {
 284                                                 $o .= $func.": ".$time."\n";
 285                                         }
 286                                 }
 287                         }
 288                         if (isset($a->callstack["database_write"])) {
 289                                 $o .= "\nDatabase Write:\n";
 290                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 291                                         $time = round($time, 3);
 292                                         if ($time > 0) {
 293                                                 $o .= $func.": ".$time."\n";
 294                                         }
 295                                 }
 296                         }
 297                         if (isset($a->callstack["network"])) {
 298                                 $o .= "\nNetwork:\n";
 299                                 foreach ($a->callstack["network"] AS $func => $time) {
 300                                         $time = round($time, 3);
 301                                         if ($time > 0) {
 302                                                 $o .= $func.": ".$time."\n";
 303                                         }
 304                                 }
 305                         }
 306                 } else {
 307                         $o = '';
 308                 }
 309
 310                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 311                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 312                         number_format($a->performance["database_write"], 2),
 313                         number_format($a->performance["network"], 2),
 314                         number_format($a->performance["file"], 2),
 315                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 316                         number_format($duration, 2)),
 317                         LOGGER_DEBUG);
 318         }
 319
 320         $cooldown = Config::get("system", "worker_cooldown", 0);
 321
 322         if ($cooldown > 0) {
 323                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 324                 sleep($cooldown);
 325         }
 326 }
 327
 328 /**
 329  * @brief Checks if the number of database connections has reached a critical limit.
 330  *
 331  * @return bool Are more than 3/4 of the maximum connections used?
 332  */
 333 function poller_max_connections_reached() {
 334
 335         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 336         $max = Config::get("system", "max_connections");
 337
 338         // Fetch the percentage level where the poller will get active
 339         $maxlevel = Config::get("system", "max_connections_level", 75);
 340
 341         if ($max == 0) {
 342                 // the maximum number of possible user connections can be a system variable
 343                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 344                 if (dbm::is_result($r)) {
 345                         $max = $r[0]["Value"];
 346                 }
 347                 // Or it can be granted. This overrides the system variable
 348                 $r = q("SHOW GRANTS");
 349                 if (dbm::is_result($r)) {
 350                         foreach ($r AS $grants) {
 351                                 $grant = array_pop($grants);
 352                                 if (stristr($grant, "GRANT USAGE ON")) {
 353                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
 354                                                 $max = $match[1];
 355                                         }
 356                                 }
 357                         }
 358                 }
 359         }
 360
 361         // If $max is set we will use the processlist to determine the current number of connections
 362         // The processlist only shows entries of the current user
 363         if ($max != 0) {
 364                 $r = q("SHOW PROCESSLIST");
 365                 if (!dbm::is_result($r)) {
 366                         return false;
 367                 }
 368                 $used = count($r);
 369
 370                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 371
 372                 $level = ($used / $max) * 100;
 373
 374                 if ($level >= $maxlevel) {
 375                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 376                         return true;
 377                 }
 378         }
 379
 380         // We will now check for the system values.
 381         // This limit could be reached although the user limits are fine.
 382         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 383         if (!dbm::is_result($r)) {
 384                 return false;
 385         }
 386         $max = intval($r[0]["Value"]);
 387         if ($max == 0) {
 388                 return false;
 389         }
 390         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 391         if (!dbm::is_result($r)) {
 392                 return false;
 393         }
 394         $used = intval($r[0]["Value"]);
 395         if ($used == 0) {
 396                 return false;
 397         }
 398         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 399
 400         $level = $used / $max * 100;
 401
 402         if ($level < $maxlevel) {
 403                 return false;
 404         }
 405         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 406         return true;
 407 }
 408
 409 /**
 410  * @brief fix the queue entry if the worker process died
 411  *
 412  */
 413 function poller_kill_stale_workers() {
 414         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s'", dbesc(NULL_DATE));
 415
 416         if (!dbm::is_result($r)) {
 417                 // No processing here needed
 418                 return;
 419         }
 420
 421         foreach ($r AS $pid) {
 422                 if (!posix_kill($pid["pid"], 0)) {
 423                         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
 424                                         array('pid' => $pid["pid"]));
 425                 } else {
 426                         // Kill long running processes
 427
 428                         // Check if the priority is in a valid range
 429                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
 430                                 $pid["priority"] = PRIORITY_MEDIUM;
 431                         }
 432
 433                         // Define the maximum durations
 434                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 435                         $max_duration = $max_duration_defaults[$pid["priority"]];
 436
 437                         $argv = json_decode($pid["parameter"]);
 438                         $argv[0] = basename($argv[0]);
 439
 440                         // How long is the process already running?
 441                         $duration = (time() - strtotime($pid["executed"])) / 60;
 442                         if ($duration > $max_duration) {
 443                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 444                                 posix_kill($pid["pid"], SIGTERM);
 445
 446                                 // We killed the stale process.
 447                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 448                                 // Additionally we are lowering the priority.
 449                                 dba::update('workerqueue',
 450                                                 array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
 451                                                 array('pid' => $pid["pid"]));
 452                         } else {
 453                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 454                         }
 455                 }
 456         }
 457 }
 458
 459 /**
 460  * @brief Checks if the number of active workers exceeds the given limits
 461  *
 462  * @param integer $entries The number of not executed entries in the worker queue
 463  * @param integer $top_priority The highest not executed priority in the worker queue
 464  * @param boolean $high_running Is a process with priority "$top_priority" running?
 465  *
 466  * @return bool Are there too much workers running?
 467  */
 468 function poller_too_much_workers() {
 469         $queues = Config::get("system", "worker_queues", 4);
 470
 471         $maxqueues = $queues;
 472
 473         $active = poller_active_workers();
 474
 475         // Decrease the number of workers at higher load
 476         $load = current_load();
 477         if ($load) {
 478                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 479
 480                 $maxworkers = $queues;
 481
 482                 // Some magical mathemathics to reduce the workers
 483                 $exponent = 3;
 484                 $slope = $maxworkers / pow($maxsysload, $exponent);
 485                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 486
 487                 if (Config::get('system', 'worker_debug')) {
 488                         // Create a list of queue entries grouped by their priority
 489                         $listitem = array();
 490
 491                         // Adding all processes with no workerqueue entry
 492                         $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS (SELECT id FROM `workerqueue` WHERE `workerqueue`.`pid` = `process`.`pid`)");
 493                         if ($process = dba::fetch($processes)) {
 494                                 $listitem[0] = "0:".$process["running"];
 495                         }
 496                         dba::close($processes);
 497
 498                         // Now adding all processes with workerqueue entries
 499                         $entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
 500                         while ($entry = dba::fetch($entries)) {
 501                                 $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE `priority` = ?", $entry["priority"]);
 502                                 if ($process = dba::fetch($processes)) {
 503                                         $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 504                                 }
 505                                 dba::close($processes);
 506                         }
 507                         dba::close($entries);
 508                         $processlist = ' ('.implode(', ', $listitem).')';
 509                 }
 510
 511                 $entries = poller_total_entries();
 512
 513                 if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
 514                         $top_priority = poller_highest_priority();
 515                         $high_running = poller_process_with_priority_active($top_priority);
 516
 517                         if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
 518                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 519                                 $queues = $active + 1;
 520                         }
 521                 }
 522
 523                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 524
 525                 // Are there fewer workers running as possible? Then fork a new one.
 526                 if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
 527                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 528                         $args = array("include/poller.php", "no_cron");
 529                         $a = get_app();
 530                         $a->proc_run($args);
 531                 }
 532         }
 533
 534         return $active >= $queues;
 535 }
 536
 537 /**
 538  * @brief Returns the number of active poller processes
 539  *
 540  * @return integer Number of active poller processes
 541  */
 542 function poller_active_workers() {
 543         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 544
 545         return $workers[0]["processes"];
 546 }
 547
 548 /**
 549  * @brief Check if we should pass some slow processes
 550  *
 551  * When the active processes of the highest priority are using more than 2/3
 552  * of all processes, we let pass slower processes.
 553  *
 554  * @param string $highest_priority Returns the currently highest priority
 555  * @return bool We let pass a slower process than $highest_priority
 556  */
 557 function poller_passing_slow(&$highest_priority) {
 558
 559         $highest_priority = 0;
 560
 561         $r = q("SELECT `priority`
 562                 FROM `process`
 563                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
 564
 565         // No active processes at all? Fine
 566         if (!dbm::is_result($r)) {
 567                 return false;
 568         }
 569         $priorities = array();
 570         foreach ($r AS $line) {
 571                 $priorities[] = $line["priority"];
 572         }
 573         // Should not happen
 574         if (count($priorities) == 0) {
 575                 return false;
 576         }
 577         $highest_priority = min($priorities);
 578
 579         // The highest process is already the slowest one?
 580         // Then we quit
 581         if ($highest_priority == PRIORITY_NEGLIGIBLE) {
 582                 return false;
 583         }
 584         $high = 0;
 585         foreach ($priorities AS $priority) {
 586                 if ($priority == $highest_priority) {
 587                         ++$high;
 588                 }
 589         }
 590         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 591         $passing_slow = (($high/count($priorities)) > (2/3));
 592
 593         if ($passing_slow) {
 594                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 595         }
 596         return $passing_slow;
 597 }
 598
 599 /**
 600  * @brief Find and claim the next worker process for us
 601  *
 602  * @return boolean Have we found something?
 603  */
 604 function find_worker_processes() {
 605         // Check if we should pass some low priority process
 606         $highest_priority = 0;
 607         $found = false;
 608
 609         if (poller_passing_slow($highest_priority)) {
 610                 // Are there waiting processes with a higher priority than the currently highest?
 611                 $result = dba::p("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 612                                         WHERE `executed` <= ? AND `priority` < ?
 613                                         ORDER BY `priority`, `created` LIMIT 1",
 614                                 datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 615                 if (dbm::is_result($result)) {
 616                         $found = (dba::num_rows($result) > 0);
 617                 }
 618                 dba::close($result);
 619
 620                 if (!$found) {
 621                         // Give slower processes some processing time
 622                         $result = dba::p("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 623                                                 WHERE `executed` <= ? AND `priority` > ?
 624                                                 ORDER BY `priority`, `created` LIMIT 1",
 625                                         datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 626                         if (dbm::is_result($result)) {
 627                                 $found = (dba::num_rows($result) > 0);
 628                         }
 629                         dba::close($result);
 630                 }
 631         }
 632
 633         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 634         if (!$found) {
 635                 $result = dba::p("UPDATE `workerqueue` SET `executed` = ?, `pid` = ? WHERE `executed` <= ? ORDER BY `priority`, `created` LIMIT 1",
 636                                 datetime_convert(), getmypid(), NULL_DATE);
 637                 if (dbm::is_result($result)) {
 638                         $found = (dba::num_rows($result) > 0);
 639                 }
 640                 dba::close($result);
 641         }
 642         return $found;
 643 }
 644
 645 /**
 646  * @brief Returns the next worker process
 647  *
 648  * @return string SQL statement
 649  */
 650 function poller_worker_process() {
 651
 652         $stamp = (float)microtime(true);
 653
 654         $timeout = 10;
 655         do {
 656                 $found = find_worker_processes();
 657         } while (!$found && (poller_total_entries() > 0) && (--$timeout > 0));
 658
 659         logger('Duration: '.number_format(microtime(true) - $stamp, 3), LOGGER_DEBUG);
 660
 661         if ($found) {
 662                 $r = q("SELECT * FROM `workerqueue` WHERE `pid` = %d", intval(getmypid()));
 663         }
 664         return $r;
 665 }
 666
 667 /**
 668  * @brief Removes a workerqueue entry from the current process
 669  */
 670 function poller_unclaim_process() {
 671         $mypid = getmypid();
 672
 673         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
 674 }
 675
 676 /**
 677  * @brief Call the front end worker
 678  */
 679 function call_worker() {
 680         if (!Config::get("system", "frontend_worker")) {
 681                 return;
 682         }
 683
 684         $url = App::get_baseurl()."/worker";
 685         fetch_url($url, false, $redirects, 1);
 686 }
 687
 688 /**
 689  * @brief Call the front end worker if there aren't any active
 690  */
 691 function call_worker_if_idle() {
 692         if (!Config::get("system", "frontend_worker")) {
 693                 return;
 694         }
 695
 696         // Do we have "proc_open"? Then we can fork the poller
 697         if (function_exists("proc_open")) {
 698                 // When was the last time that we called the worker?
 699                 // Less than one minute? Then we quit
 700                 if ((time() - Config::get("system", "worker_started")) < 60) {
 701                         return;
 702                 }
 703
 704                 set_config("system", "worker_started", time());
 705
 706                 // Do we have enough running workers? Then we quit here.
 707                 if (poller_too_much_workers()) {
 708                         // Cleaning dead processes
 709                         poller_kill_stale_workers();
 710                         get_app()->remove_inactive_processes();
 711
 712                         return;
 713                 }
 714
 715                 poller_run_cron();
 716
 717                 logger('Call poller', LOGGER_DEBUG);
 718
 719                 $args = array("include/poller.php", "no_cron");
 720                 $a = get_app();
 721                 $a->proc_run($args);
 722                 return;
 723         }
 724
 725         // We cannot execute background processes.
 726         // We now run the processes from the frontend.
 727         // This won't work with long running processes.
 728         poller_run_cron();
 729
 730         clear_worker_processes();
 731
 732         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 733
 734         if ($workers[0]["processes"] == 0) {
 735                 call_worker();
 736         }
 737 }
 738
 739 /**
 740  * @brief Removes long running worker processes
 741  */
 742 function clear_worker_processes() {
 743         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 744
 745         /// @todo We should clean up the corresponding workerqueue entries as well
 746         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 747                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 748 }
 749
 750 /**
 751  * @brief Runs the cron processes
 752  */
 753 function poller_run_cron() {
 754         logger('Add cron entries', LOGGER_DEBUG);
 755
 756         // Check for spooled items
 757         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 758
 759         // Run the cron job that calls all other jobs
 760         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 761
 762         // Run the cronhooks job separately from cron for being able to use a different timing
 763         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 764
 765         // Cleaning dead processes
 766         poller_kill_stale_workers();
 767 }
 768
 769 if (array_search(__file__,get_included_files())===0){
 770         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 771
 772         poller_unclaim_process();
 773
 774         get_app()->end_process();
 775
 776         Lock::remove('poller_worker');
 777
 778         killme();
 779 }