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, $poller_up_start;
  22
  23         $poller_up_start = microtime(true);
  24
  25         $a = new App(dirname(__DIR__));
  26
  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         Config::load();
  33
  34         // Quit when in maintenance
  35         if (Config::get('system', 'maintenance', true)) {
  36                 return;
  37         }
  38
  39         $a->set_baseurl(Config::get('system', 'url'));
  40
  41         load_hooks();
  42
  43         // At first check the maximum load. We shouldn't continue with a high load
  44         if ($a->maxload_reached()) {
  45                 logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
  46                 return;
  47         }
  48
  49         // We now start the process. This is done after the load check since this could increase the load.
  50         $a->start_process();
  51
  52         // Kill stale processes every 5 minutes
  53         $last_cleanup = Config::get('system', 'poller_last_cleaned', 0);
  54         if (time() > ($last_cleanup + 300)) {
  55                 Config::set('system', 'poller_last_cleaned', time());
  56                 poller_kill_stale_workers();
  57         }
  58
  59         // Count active workers and compare them with a maximum value that depends on the load
  60         if (poller_too_much_workers()) {
  61                 logger('Pre check: Active worker limit reached, quitting.', LOGGER_DEBUG);
  62                 return;
  63         }
  64
  65         // Do we have too few memory?
  66         if ($a->min_memory_reached()) {
  67                 logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
  68                 return;
  69         }
  70
  71         // Possibly there are too much database connections
  72         if (poller_max_connections_reached()) {
  73                 logger('Pre check: maximum connections reached, quitting.', LOGGER_DEBUG);
  74                 return;
  75         }
  76
  77         // Possibly there are too much database processes that block the system
  78         if ($a->max_processes_reached()) {
  79                 logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
  80                 return;
  81         }
  82
  83         // Now we start additional cron processes if we should do so
  84         if (($argc <= 1) || ($argv[1] != "no_cron")) {
  85                 poller_run_cron();
  86         }
  87
  88         $starttime = time();
  89
  90         // We fetch the next queue entry that is about to be executed
  91         while ($r = poller_worker_process()) {
  92                 foreach ($r AS $entry) {
  93                         // Assure that the priority is an integer value
  94                         $entry['priority'] = (int)$entry['priority'];
  95
  96                         // The work will be done
  97                         if (!poller_execute($entry)) {
  98                                 logger('Process execution failed, quitting.', LOGGER_DEBUG);
  99                                 return;
 100                         }
 101                 }
 102
 103                 // To avoid the quitting of multiple pollers only one poller at a time will execute the check
 104                 if (Lock::set('poller_worker', 0)) {
 105                         // Count active workers and compare them with a maximum value that depends on the load
 106                         if (poller_too_much_workers()) {
 107                                 logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
 108                                 return;
 109                         }
 110
 111                         // Check free memory
 112                         if ($a->min_memory_reached()) {
 113                                 logger('Memory limit reached, quitting.', LOGGER_DEBUG);
 114                                 return;
 115                         }
 116                         Lock::remove('poller_worker');
 117                 }
 118
 119                 // Quit the poller once every 5 minutes
 120                 if (time() > ($starttime + 300)) {
 121                         logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
 122                         return;
 123                 }
 124         }
 125         logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
 126 }
 127
 128 /**
 129  * @brief Returns the number of non executed entries in the worker queue
 130  *
 131  * @return integer Number of non executed entries in the worker queue
 132  */
 133 function poller_total_entries() {
 134         $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= '%s' AND NOT `done`", dbesc(NULL_DATE));
 135         if (dbm::is_result($s)) {
 136                 return $s[0]["total"];
 137         } else {
 138                 return 0;
 139         }
 140 }
 141
 142 /**
 143  * @brief Returns the highest priority in the worker queue that isn't executed
 144  *
 145  * @return integer Number of active poller processes
 146  */
 147 function poller_highest_priority() {
 148         $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` <= '%s' AND NOT `done` ORDER BY `priority` LIMIT 1", dbesc(NULL_DATE));
 149         if (dbm::is_result($s)) {
 150                 return $s[0]["priority"];
 151         } else {
 152                 return 0;
 153         }
 154 }
 155
 156 /**
 157  * @brief Returns if a process with the given priority is running
 158  *
 159  * @param integer $priority The priority that should be checked
 160  *
 161  * @return integer Is there a process running with that priority?
 162  */
 163 function poller_process_with_priority_active($priority) {
 164         $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` > '%s' AND NOT `done` LIMIT 1",
 165                         intval($priority), dbesc(NULL_DATE));
 166         return dbm::is_result($s);
 167 }
 168
 169 /**
 170  * @brief Execute a worker entry
 171  *
 172  * @param array $queue Workerqueue entry
 173  *
 174  * @return boolean "true" if further processing should be stopped
 175  */
 176 function poller_execute($queue) {
 177         global $poller_db_duration;
 178
 179         $a = get_app();
 180
 181         $mypid = getmypid();
 182
 183         // Quit when in maintenance
 184         if (Config::get('system', 'maintenance', true)) {
 185                 logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 186                 return false;
 187         }
 188
 189         // Constantly check the number of parallel database processes
 190         if ($a->max_processes_reached()) {
 191                 logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 192                 return false;
 193         }
 194
 195         // Constantly check the number of available database connections to let the frontend be accessible at any time
 196         if (poller_max_connections_reached()) {
 197                 logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
 198                 return false;
 199         }
 200
 201         $argv = json_decode($queue["parameter"]);
 202
 203         // Check for existance and validity of the include file
 204         $include = $argv[0];
 205
 206         if (!validate_include($include)) {
 207                 logger("Include file ".$argv[0]." is not valid!");
 208                 dba::delete('workerqueue', array('id' => $queue["id"]));
 209                 return true;
 210         }
 211
 212         require_once($include);
 213
 214         $funcname = str_replace(".php", "", basename($argv[0]))."_run";
 215
 216         if (function_exists($funcname)) {
 217                 poller_exec_function($queue, $funcname, $argv);
 218
 219                 $stamp = (float)microtime(true);
 220                 dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]));
 221                 $poller_db_duration = (microtime(true) - $stamp);
 222         } else {
 223                 logger("Function ".$funcname." does not exist");
 224                 dba::delete('workerqueue', array('id' => $queue["id"]));
 225         }
 226
 227         return true;
 228 }
 229
 230 /**
 231  * @brief Execute a function from the queue
 232  *
 233  * @param array $queue Workerqueue entry
 234  * @param string $funcname name of the function
 235  * @param array $argv Array of values to be passed to the function
 236  */
 237 function poller_exec_function($queue, $funcname, $argv) {
 238         global $poller_up_start, $poller_db_duration;
 239
 240         $a = get_app();
 241
 242         $mypid = getmypid();
 243
 244         $argc = count($argv);
 245
 246         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
 247
 248         $stamp = (float)microtime(true);
 249
 250         // We use the callstack here to analyze the performance of executed worker entries.
 251         // For this reason the variables have to be initialized.
 252         if (Config::get("system", "profiler")) {
 253                 $a->performance["start"] = microtime(true);
 254                 $a->performance["database"] = 0;
 255                 $a->performance["database_write"] = 0;
 256                 $a->performance["network"] = 0;
 257                 $a->performance["file"] = 0;
 258                 $a->performance["rendering"] = 0;
 259                 $a->performance["parser"] = 0;
 260                 $a->performance["marktime"] = 0;
 261                 $a->performance["markstart"] = microtime(true);
 262                 $a->callstack = array();
 263         }
 264
 265         // For better logging create a new process id for every worker call
 266         // But preserve the old one for the worker
 267         $old_process_id = $a->process_id;
 268         $a->process_id = uniqid("wrk", true);
 269         $a->queue = $queue;
 270
 271         $up_duration = number_format(microtime(true) - $poller_up_start, 3);
 272
 273         $funcname($argv, $argc);
 274
 275         $a->process_id = $old_process_id;
 276         unset($a->queue);
 277
 278         $duration = number_format(microtime(true) - $stamp, 3);
 279
 280         $poller_up_start = microtime(true);
 281
 282         /* With these values we can analyze how effective the worker is.
 283          * The database and rest time should be low since this is the unproductive time.
 284          * The execution time is the productive time.
 285          * By changing parameters like the maximum number of workers we can check the effectivness.
 286         */
 287         logger('DB: '.number_format($poller_db_duration, 2).' - Rest: '.number_format($up_duration - $poller_db_duration, 2).' - Execution: '.number_format($duration, 2), LOGGER_DEBUG);
 288
 289         if ($duration > 3600) {
 290                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
 291         } elseif ($duration > 600) {
 292                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 293         } elseif ($duration > 300) {
 294                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 295         } elseif ($duration > 120) {
 296                 logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
 297         }
 298
 299         logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds.");
 300
 301         // Write down the performance values into the log
 302         if (Config::get("system", "profiler")) {
 303                 $duration = microtime(true)-$a->performance["start"];
 304
 305                 if (Config::get("rendertime", "callstack")) {
 306                         if (isset($a->callstack["database"])) {
 307                                 $o = "\nDatabase Read:\n";
 308                                 foreach ($a->callstack["database"] AS $func => $time) {
 309                                         $time = round($time, 3);
 310                                         if ($time > 0) {
 311                                                 $o .= $func.": ".$time."\n";
 312                                         }
 313                                 }
 314                         }
 315                         if (isset($a->callstack["database_write"])) {
 316                                 $o .= "\nDatabase Write:\n";
 317                                 foreach ($a->callstack["database_write"] AS $func => $time) {
 318                                         $time = round($time, 3);
 319                                         if ($time > 0) {
 320                                                 $o .= $func.": ".$time."\n";
 321                                         }
 322                                 }
 323                         }
 324                         if (isset($a->callstack["network"])) {
 325                                 $o .= "\nNetwork:\n";
 326                                 foreach ($a->callstack["network"] AS $func => $time) {
 327                                         $time = round($time, 3);
 328                                         if ($time > 0) {
 329                                                 $o .= $func.": ".$time."\n";
 330                                         }
 331                                 }
 332                         }
 333                 } else {
 334                         $o = '';
 335                 }
 336
 337                 logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 338                         number_format($a->performance["database"] - $a->performance["database_write"], 2),
 339                         number_format($a->performance["database_write"], 2),
 340                         number_format($a->performance["network"], 2),
 341                         number_format($a->performance["file"], 2),
 342                         number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
 343                         number_format($duration, 2)),
 344                         LOGGER_DEBUG);
 345         }
 346
 347         $cooldown = Config::get("system", "worker_cooldown", 0);
 348
 349         if ($cooldown > 0) {
 350                 logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 351                 sleep($cooldown);
 352         }
 353 }
 354
 355 /**
 356  * @brief Checks if the number of database connections has reached a critical limit.
 357  *
 358  * @return bool Are more than 3/4 of the maximum connections used?
 359  */
 360 function poller_max_connections_reached() {
 361
 362         // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 363         $max = Config::get("system", "max_connections");
 364
 365         // Fetch the percentage level where the poller will get active
 366         $maxlevel = Config::get("system", "max_connections_level", 75);
 367
 368         if ($max == 0) {
 369                 // the maximum number of possible user connections can be a system variable
 370                 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
 371                 if (dbm::is_result($r)) {
 372                         $max = $r[0]["Value"];
 373                 }
 374                 // Or it can be granted. This overrides the system variable
 375                 $r = q("SHOW GRANTS");
 376                 if (dbm::is_result($r)) {
 377                         foreach ($r AS $grants) {
 378                                 $grant = array_pop($grants);
 379                                 if (stristr($grant, "GRANT USAGE ON")) {
 380                                         if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
 381                                                 $max = $match[1];
 382                                         }
 383                                 }
 384                         }
 385                 }
 386         }
 387
 388         // If $max is set we will use the processlist to determine the current number of connections
 389         // The processlist only shows entries of the current user
 390         if ($max != 0) {
 391                 $r = q("SHOW PROCESSLIST");
 392                 if (!dbm::is_result($r)) {
 393                         return false;
 394                 }
 395                 $used = count($r);
 396
 397                 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 398
 399                 $level = ($used / $max) * 100;
 400
 401                 if ($level >= $maxlevel) {
 402                         logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 403                         return true;
 404                 }
 405         }
 406
 407         // We will now check for the system values.
 408         // This limit could be reached although the user limits are fine.
 409         $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
 410         if (!dbm::is_result($r)) {
 411                 return false;
 412         }
 413         $max = intval($r[0]["Value"]);
 414         if ($max == 0) {
 415                 return false;
 416         }
 417         $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
 418         if (!dbm::is_result($r)) {
 419                 return false;
 420         }
 421         $used = intval($r[0]["Value"]);
 422         if ($used == 0) {
 423                 return false;
 424         }
 425         logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
 426
 427         $level = $used / $max * 100;
 428
 429         if ($level < $maxlevel) {
 430                 return false;
 431         }
 432         logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 433         return true;
 434 }
 435
 436 /**
 437  * @brief fix the queue entry if the worker process died
 438  *
 439  */
 440 function poller_kill_stale_workers() {
 441         $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` > '%s' AND NOT `done`", dbesc(NULL_DATE));
 442
 443         if (!dbm::is_result($r)) {
 444                 // No processing here needed
 445                 return;
 446         }
 447
 448         foreach ($r AS $pid) {
 449                 if (!posix_kill($pid["pid"], 0)) {
 450                         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
 451                                         array('pid' => $pid["pid"]));
 452                 } else {
 453                         // Kill long running processes
 454
 455                         // Check if the priority is in a valid range
 456                         if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
 457                                 $pid["priority"] = PRIORITY_MEDIUM;
 458                         }
 459
 460                         // Define the maximum durations
 461                         $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
 462                         $max_duration = $max_duration_defaults[$pid["priority"]];
 463
 464                         $argv = json_decode($pid["parameter"]);
 465                         $argv[0] = basename($argv[0]);
 466
 467                         // How long is the process already running?
 468                         $duration = (time() - strtotime($pid["executed"])) / 60;
 469                         if ($duration > $max_duration) {
 470                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 471                                 posix_kill($pid["pid"], SIGTERM);
 472
 473                                 // We killed the stale process.
 474                                 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
 475                                 // Additionally we are lowering the priority.
 476                                 dba::update('workerqueue',
 477                                                 array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => PRIORITY_NEGLIGIBLE, 'pid' => 0),
 478                                                 array('pid' => $pid["pid"]));
 479                         } else {
 480                                 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 481                         }
 482                 }
 483         }
 484 }
 485
 486 /**
 487  * @brief Checks if the number of active workers exceeds the given limits
 488  *
 489  * @return bool Are there too much workers running?
 490  */
 491 function poller_too_much_workers() {
 492         $queues = Config::get("system", "worker_queues", 4);
 493
 494         $maxqueues = $queues;
 495
 496         $active = poller_active_workers();
 497
 498         // Decrease the number of workers at higher load
 499         $load = current_load();
 500         if ($load) {
 501                 $maxsysload = intval(Config::get("system", "maxloadavg", 50));
 502
 503                 $maxworkers = $queues;
 504
 505                 // Some magical mathemathics to reduce the workers
 506                 $exponent = 3;
 507                 $slope = $maxworkers / pow($maxsysload, $exponent);
 508                 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 509
 510                 if (Config::get('system', 'worker_debug')) {
 511                         // Create a list of queue entries grouped by their priority
 512                         $listitem = array();
 513
 514                         // Adding all processes with no workerqueue entry
 515                         $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS (SELECT id FROM `workerqueue` WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done`)");
 516                         if ($process = dba::fetch($processes)) {
 517                                 $listitem[0] = "0:".$process["running"];
 518                         }
 519                         dba::close($processes);
 520
 521                         // Now adding all processes with workerqueue entries
 522                         $entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
 523                         while ($entry = dba::fetch($entries)) {
 524                                 $processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
 525                                 if ($process = dba::fetch($processes)) {
 526                                         $listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 527                                 }
 528                                 dba::close($processes);
 529                         }
 530                         dba::close($entries);
 531                         $processlist = ' ('.implode(', ', $listitem).')';
 532                 }
 533
 534                 $entries = poller_total_entries();
 535
 536                 if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
 537                         $top_priority = poller_highest_priority();
 538                         $high_running = poller_process_with_priority_active($top_priority);
 539
 540                         if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
 541                                 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
 542                                 $queues = $active + 1;
 543                         }
 544                 }
 545
 546                 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 547
 548                 // Are there fewer workers running as possible? Then fork a new one.
 549                 if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
 550                         logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
 551                         $args = array("include/poller.php", "no_cron");
 552                         $a = get_app();
 553                         $a->proc_run($args);
 554                 }
 555         }
 556
 557         return $active >= $queues;
 558 }
 559
 560 /**
 561  * @brief Returns the number of active poller processes
 562  *
 563  * @return integer Number of active poller processes
 564  */
 565 function poller_active_workers() {
 566         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 567
 568         return $workers[0]["processes"];
 569 }
 570
 571 /**
 572  * @brief Check if we should pass some slow processes
 573  *
 574  * When the active processes of the highest priority are using more than 2/3
 575  * of all processes, we let pass slower processes.
 576  *
 577  * @param string $highest_priority Returns the currently highest priority
 578  * @return bool We let pass a slower process than $highest_priority
 579  */
 580 function poller_passing_slow(&$highest_priority) {
 581
 582         $highest_priority = 0;
 583
 584         $r = q("SELECT `priority`
 585                 FROM `process`
 586                 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`");
 587
 588         // No active processes at all? Fine
 589         if (!dbm::is_result($r)) {
 590                 return false;
 591         }
 592         $priorities = array();
 593         foreach ($r AS $line) {
 594                 $priorities[] = $line["priority"];
 595         }
 596         // Should not happen
 597         if (count($priorities) == 0) {
 598                 return false;
 599         }
 600         $highest_priority = min($priorities);
 601
 602         // The highest process is already the slowest one?
 603         // Then we quit
 604         if ($highest_priority == PRIORITY_NEGLIGIBLE) {
 605                 return false;
 606         }
 607         $high = 0;
 608         foreach ($priorities AS $priority) {
 609                 if ($priority == $highest_priority) {
 610                         ++$high;
 611                 }
 612         }
 613         logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
 614         $passing_slow = (($high/count($priorities)) > (2/3));
 615
 616         if ($passing_slow) {
 617                 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
 618         }
 619         return $passing_slow;
 620 }
 621
 622 /**
 623  * @brief Find and claim the next worker process for us
 624  *
 625  * @return boolean Have we found something?
 626  */
 627 function find_worker_processes() {
 628         // Check if we should pass some low priority process
 629         $highest_priority = 0;
 630         $found = false;
 631         $limit = Config::get('system', 'worker_fetch_limit', 5);
 632
 633         if (poller_passing_slow($highest_priority)) {
 634                 // Are there waiting processes with a higher priority than the currently highest?
 635                 $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 636                                         WHERE `executed` <= ? AND `priority` < ? AND NOT `done`
 637                                         ORDER BY `priority`, `created` LIMIT ".intval($limit),
 638                                 datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 639                 if ($result) {
 640                         $found = (dba::affected_rows() > 0);
 641                 }
 642
 643                 if (!$found) {
 644                         // Give slower processes some processing time
 645                         $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ?
 646                                                 WHERE `executed` <= ? AND `priority` > ? AND NOT `done`
 647                                                 ORDER BY `priority`, `created` LIMIT 1",
 648                                         datetime_convert(), getmypid(), NULL_DATE, $highest_priority);
 649                         if ($result) {
 650                                 $found = (dba::affected_rows() > 0);
 651                         }
 652                 }
 653         }
 654
 655         // If there is no result (or we shouldn't pass lower processes) we check without priority limit
 656         if (!$found) {
 657                 $result = dba::e("UPDATE `workerqueue` SET `executed` = ?, `pid` = ? WHERE `executed` <= ? AND NOT `done` ORDER BY `priority`, `created` LIMIT ".intval($limit),
 658                                 datetime_convert(), getmypid(), NULL_DATE);
 659                 if ($result) {
 660                         $found = (dba::affected_rows() > 0);
 661                 }
 662         }
 663         return $found;
 664 }
 665
 666 /**
 667  * @brief Returns the next worker process
 668  *
 669  * @return string SQL statement
 670  */
 671 function poller_worker_process() {
 672         global $poller_db_duration;
 673
 674         $stamp = (float)microtime(true);
 675
 676         $found = find_worker_processes();
 677
 678         $poller_db_duration += (microtime(true) - $stamp);
 679
 680         if ($found) {
 681                 $r = q("SELECT * FROM `workerqueue` WHERE `pid` = %d", intval(getmypid()));
 682         }
 683         return $r;
 684 }
 685
 686 /**
 687  * @brief Removes a workerqueue entry from the current process
 688  */
 689 function poller_unclaim_process() {
 690         $mypid = getmypid();
 691
 692         dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid));
 693 }
 694
 695 /**
 696  * @brief Call the front end worker
 697  */
 698 function call_worker() {
 699         if (!Config::get("system", "frontend_worker")) {
 700                 return;
 701         }
 702
 703         $url = App::get_baseurl()."/worker";
 704         fetch_url($url, false, $redirects, 1);
 705 }
 706
 707 /**
 708  * @brief Call the front end worker if there aren't any active
 709  */
 710 function call_worker_if_idle() {
 711         if (!Config::get("system", "frontend_worker")) {
 712                 return;
 713         }
 714
 715         // Do we have "proc_open"? Then we can fork the poller
 716         if (function_exists("proc_open")) {
 717                 // When was the last time that we called the worker?
 718                 // Less than one minute? Then we quit
 719                 if ((time() - Config::get("system", "worker_started")) < 60) {
 720                         return;
 721                 }
 722
 723                 set_config("system", "worker_started", time());
 724
 725                 // Do we have enough running workers? Then we quit here.
 726                 if (poller_too_much_workers()) {
 727                         // Cleaning dead processes
 728                         poller_kill_stale_workers();
 729                         get_app()->remove_inactive_processes();
 730
 731                         return;
 732                 }
 733
 734                 poller_run_cron();
 735
 736                 logger('Call poller', LOGGER_DEBUG);
 737
 738                 $args = array("include/poller.php", "no_cron");
 739                 $a = get_app();
 740                 $a->proc_run($args);
 741                 return;
 742         }
 743
 744         // We cannot execute background processes.
 745         // We now run the processes from the frontend.
 746         // This won't work with long running processes.
 747         poller_run_cron();
 748
 749         clear_worker_processes();
 750
 751         $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
 752
 753         if ($workers[0]["processes"] == 0) {
 754                 call_worker();
 755         }
 756 }
 757
 758 /**
 759  * @brief Removes long running worker processes
 760  */
 761 function clear_worker_processes() {
 762         $timeout = Config::get("system", "frontend_worker_timeout", 10);
 763
 764         /// @todo We should clean up the corresponding workerqueue entries as well
 765         q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
 766                 dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
 767 }
 768
 769 /**
 770  * @brief Runs the cron processes
 771  */
 772 function poller_run_cron() {
 773         logger('Add cron entries', LOGGER_DEBUG);
 774
 775         // Check for spooled items
 776         proc_run(PRIORITY_HIGH, "include/spool_post.php");
 777
 778         // Run the cron job that calls all other jobs
 779         proc_run(PRIORITY_MEDIUM, "include/cron.php");
 780
 781         // Run the cronhooks job separately from cron for being able to use a different timing
 782         proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 783
 784         // Cleaning dead processes
 785         poller_kill_stale_workers();
 786 }
 787
 788 if (array_search(__file__,get_included_files())===0){
 789         poller_run($_SERVER["argv"],$_SERVER["argc"]);
 790
 791         poller_unclaim_process();
 792
 793         get_app()->end_process();
 794
 795         Lock::remove('poller_worker');
 796
 797         killme();
 798 }