X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FCore%2FWorker.php;h=723cd809da44d3230721afd1eb4e06cf5a17ffb7;hb=389685e09944e3823effd2e820ab2fd95d8b4b32;hp=2cfb4de742be6c3a715393bd0f268b6c97e6c868;hpb=b85c94a60d5142adc9aa77d2de7c05b91021c450;p=friendica.git

diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index 2cfb4de742..723cd809da 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -1,14 +1,16 @@
 <?php
+/**
+ * @file src/Core/Worker.php
+ */
 namespace Friendica\Core;
 
-use Friendica\App;
-use Friendica\Core\System;
-use Friendica\Core\Config;
-use Friendica\Core\Worker;
-use Friendica\Database\DBM;
-use Friendica\Util\Lock;
+use Friendica\Database\DBA;
+use Friendica\Model\Process;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Network;
+use Friendica\BaseObject;
 
-use dba;
+require_once 'include/dba.php';
 
 /**
  * @file src/Core/Worker.php
@@ -19,7 +21,8 @@ use dba;
 /**
  * @brief Worker methods
  */
-class Worker {
+class Worker
+{
 	private static $up_start;
 	private static $db_duration;
 	private static $last_update;
@@ -29,25 +32,27 @@ class Worker {
 	 * @brief Processes the tasks that are in the workerqueue table
 	 *
 	 * @param boolean $run_cron Should the cron processes be executed?
+	 * @return void
 	 */
-	public static function processQueue($run_cron = true) {
+	public static function processQueue($run_cron = true)
+	{
 		$a = get_app();
 
 		self::$up_start = microtime(true);
 
 		// At first check the maximum load. We shouldn't continue with a high load
-		if ($a->maxload_reached()) {
+		if ($a->isMaxLoadReached()) {
 			logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
 			return;
 		}
 
 		// We now start the process. This is done after the load check since this could increase the load.
-		$a->start_process();
+		self::startProcess();
 
 		// Kill stale processes every 5 minutes
-		$last_cleanup = Config::get('system', 'poller_last_cleaned', 0);
+		$last_cleanup = Config::get('system', 'worker_last_cleaned', 0);
 		if (time() > ($last_cleanup + 300)) {
-			Config::set('system', 'poller_last_cleaned', time());
+			Config::set('system', 'worker_last_cleaned', time());
 			self::killStaleWorkers();
 		}
 
@@ -58,7 +63,7 @@ class Worker {
 		}
 
 		// Do we have too few memory?
-		if ($a->min_memory_reached()) {
+		if ($a->isMinMemoryReached()) {
 			logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
 			return;
 		}
@@ -70,7 +75,7 @@ class Worker {
 		}
 
 		// Possibly there are too much database processes that block the system
-		if ($a->max_processes_reached()) {
+		if ($a->isMaxProcessesReached()) {
 			logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
 			return;
 		}
@@ -84,12 +89,11 @@ class Worker {
 
 		// We fetch the next queue entry that is about to be executed
 		while ($r = self::workerProcess($passing_slow)) {
-
 			// When we are processing jobs with a lower priority, we don't refetch new jobs
 			// Otherwise fast jobs could wait behind slow ones and could be blocked.
 			$refetched = $passing_slow;
 
-			foreach ($r AS $entry) {
+			foreach ($r as $entry) {
 				// Assure that the priority is an integer value
 				$entry['priority'] = (int)$entry['priority'];
 
@@ -100,29 +104,31 @@ class Worker {
 				}
 
 				// If possible we will fetch new jobs for this worker
-				if (!$refetched && Lock::set('poller_worker_process', 0)) {
+				if (!$refetched && Lock::acquire('worker_process', 0)) {
 					$stamp = (float)microtime(true);
 					$refetched = self::findWorkerProcesses($passing_slow);
 					self::$db_duration += (microtime(true) - $stamp);
-					Lock::remove('poller_worker_process');
+					Lock::release('worker_process');
 				}
 			}
 
 			// To avoid the quitting of multiple workers only one worker at a time will execute the check
-			if (Lock::set('poller_worker', 0)) {
+			if (Lock::acquire('worker', 0)) {
 				$stamp = (float)microtime(true);
 				// Count active workers and compare them with a maximum value that depends on the load
 				if (self::tooMuchWorkers()) {
 					logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
+					Lock::release('worker');
 					return;
 				}
 
 				// Check free memory
-				if ($a->min_memory_reached()) {
+				if ($a->isMinMemoryReached()) {
 					logger('Memory limit reached, quitting.', LOGGER_DEBUG);
+					Lock::release('worker');
 					return;
 				}
-				Lock::remove('poller_worker');
+				Lock::release('worker');
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
@@ -132,7 +138,12 @@ class Worker {
 				return;
 			}
 		}
-		logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
+
+		// Cleaning up. Possibly not needed, but it doesn't harm anything.
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			self::IPCSetJobState(false);
+		}
+		logger("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", LOGGER_DEBUG);
 	}
 
 	/**
@@ -140,13 +151,10 @@ class Worker {
 	 *
 	 * @return integer Number of non executed entries in the worker queue
 	 */
-	private static function totalEntries() {
-		$s = dba::fetch_first("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= ? AND NOT `done`", NULL_DATE);
-		if (DBM::is_result($s)) {
-			return $s["total"];
-		} else {
-			return 0;
-		}
+	private static function totalEntries()
+	{
+		return DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` < ?",
+			NULL_DATE, DateTimeFormat::utcNow()]);
 	}
 
 	/**
@@ -154,11 +162,12 @@ class Worker {
 	 *
 	 * @return integer Number of active worker processes
 	 */
-	private static function highestPriority() {
-		$condition = array("`executed` <= ? AND NOT `done`", NULL_DATE);
-		$s = dba::select('workerqueue', array('priority'), $condition, array('limit' => 1, 'order' => array('priority')));
-		if (DBM::is_result($s)) {
-			return $s["priority"];
+	private static function highestPriority()
+	{
+		$condition = ["`executed` <= ? AND NOT `done` AND `next_try` < ?", NULL_DATE, DateTimeFormat::utcNow()];
+		$workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
+		if (DBA::isResult($workerqueue)) {
+			return $workerqueue["priority"];
 		} else {
 			return 0;
 		}
@@ -171,9 +180,11 @@ class Worker {
 	 *
 	 * @return integer Is there a process running with that priority?
 	 */
-	private static function processWithPriorityActive($priority) {
-		$condition = array("`priority` <= ? AND `executed` > ? AND NOT `done`", $priority, NULL_DATE);
-		return dba::exists('workerqueue', $condition);
+	private static function processWithPriorityActive($priority)
+	{
+		$condition = ["`priority` <= ? AND `executed` > ? AND NOT `done` AND `next_try` < ?",
+			$priority, NULL_DATE, DateTimeFormat::utcNow()];
+		return DBA::exists('workerqueue', $condition);
 	}
 
 	/**
@@ -183,19 +194,20 @@ class Worker {
 	 *
 	 * @return boolean "true" if further processing should be stopped
 	 */
-	public static function execute($queue) {
+	public static function execute($queue)
+	{
 		$a = get_app();
 
 		$mypid = getmypid();
 
 		// Quit when in maintenance
-		if (Config::get('system', 'maintenance', true)) {
+		if (Config::get('system', 'maintenance', false, true)) {
 			logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
 			return false;
 		}
 
 		// Constantly check the number of parallel database processes
-		if ($a->max_processes_reached()) {
+		if ($a->isMaxProcessesReached()) {
 			logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
 			return false;
 		}
@@ -206,7 +218,7 @@ class Worker {
 			return false;
 		}
 
-		$argv = json_decode($queue["parameter"]);
+		$argv = json_decode($queue["parameter"], true);
 
 		// Check for existance and validity of the include file
 		$include = $argv[0];
@@ -222,7 +234,7 @@ class Worker {
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
+				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
@@ -231,8 +243,8 @@ class Worker {
 			self::execFunction($queue, $include, $argv, true);
 
 			$stamp = (float)microtime(true);
-			if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+			if (DBA::update('workerqueue', ['done' => true], ['id' => $queue['id']])) {
+				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 
@@ -246,16 +258,15 @@ class Worker {
 
 		if (!validate_include($include)) {
 			logger("Include file ".$argv[0]." is not valid!");
-			dba::delete('workerqueue', array('id' => $queue["id"]));
+			DBA::delete('workerqueue', ['id' => $queue["id"]]);
 			return true;
 		}
 
-		require_once($include);
+		require_once $include;
 
 		$funcname = str_replace(".php", "", basename($argv[0]))."_run";
 
 		if (function_exists($funcname)) {
-
 			// We constantly update the "executed" date every minute to avoid being killed too soon
 			if (!isset(self::$last_update)) {
 				self::$last_update = strtotime($queue["executed"]);
@@ -266,20 +277,20 @@ class Worker {
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
+				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
 			self::execFunction($queue, $funcname, $argv, false);
 
 			$stamp = (float)microtime(true);
-			if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+			if (DBA::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
+				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 		} else {
 			logger("Function ".$funcname." does not exist");
-			dba::delete('workerqueue', array('id' => $queue["id"]));
+			DBA::delete('workerqueue', ['id' => $queue["id"]]);
 		}
 
 		return true;
@@ -288,18 +299,21 @@ class Worker {
 	/**
 	 * @brief Execute a function from the queue
 	 *
-	 * @param array $queue Workerqueue entry
-	 * @param string $funcname name of the function
-	 * @param array $argv Array of values to be passed to the function
+	 * @param array   $queue       Workerqueue entry
+	 * @param string  $funcname    name of the function
+	 * @param array   $argv        Array of values to be passed to the function
+	 * @param boolean $method_call boolean
+	 * @return void
 	 */
-	private static function execFunction($queue, $funcname, $argv, $method_call) {
+	private static function execFunction($queue, $funcname, $argv, $method_call)
+	{
 		$a = get_app();
 
 		$mypid = getmypid();
 
 		$argc = count($argv);
 
-		$new_process_id = uniqid("wrk", true);
+		$new_process_id = System::processID("wrk");
 
 		logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
 
@@ -311,13 +325,15 @@ class Worker {
 			$a->performance["start"] = microtime(true);
 			$a->performance["database"] = 0;
 			$a->performance["database_write"] = 0;
+			$a->performance["cache"] = 0;
+			$a->performance["cache_write"] = 0;
 			$a->performance["network"] = 0;
 			$a->performance["file"] = 0;
 			$a->performance["rendering"] = 0;
 			$a->performance["parser"] = 0;
 			$a->performance["marktime"] = 0;
 			$a->performance["markstart"] = microtime(true);
-			$a->callstack = array();
+			$a->callstack = [];
 		}
 
 		// For better logging create a new process id for every worker call
@@ -340,7 +356,7 @@ class Worker {
 		$a->process_id = $old_process_id;
 		unset($a->queue);
 
-		$duration = number_format(microtime(true) - $stamp, 3);
+		$duration = (microtime(true) - $stamp);
 
 		self::$up_start = microtime(true);
 
@@ -349,10 +365,14 @@ class Worker {
 		 * The execution time is the productive time.
 		 * By changing parameters like the maximum number of workers we can check the effectivness.
 		*/
-		logger('DB: '.number_format(self::$db_duration, 2).
+		logger(
+			'DB: '.number_format(self::$db_duration, 2).
 			' - Lock: '.number_format(self::$lock_duration, 2).
 			' - Rest: '.number_format($up_duration - self::$db_duration - self::$lock_duration, 2).
-			' - Execution: '.number_format($duration, 2), LOGGER_DEBUG);
+			' - Execution: '.number_format($duration, 2),
+			LOGGER_DEBUG
+		);
+
 		self::$lock_duration = 0;
 
 		if ($duration > 3600) {
@@ -371,10 +391,11 @@ class Worker {
 		if (Config::get("system", "profiler")) {
 			$duration = microtime(true)-$a->performance["start"];
 
+			$o = '';
 			if (Config::get("rendertime", "callstack")) {
 				if (isset($a->callstack["database"])) {
-					$o = "\nDatabase Read:\n";
-					foreach ($a->callstack["database"] AS $func => $time) {
+					$o .= "\nDatabase Read:\n";
+					foreach ($a->callstack["database"] as $func => $time) {
 						$time = round($time, 3);
 						if ($time > 0) {
 							$o .= $func.": ".$time."\n";
@@ -383,7 +404,25 @@ class Worker {
 				}
 				if (isset($a->callstack["database_write"])) {
 					$o .= "\nDatabase Write:\n";
-					foreach ($a->callstack["database_write"] AS $func => $time) {
+					foreach ($a->callstack["database_write"] as $func => $time) {
+						$time = round($time, 3);
+						if ($time > 0) {
+							$o .= $func.": ".$time."\n";
+						}
+					}
+				}
+				if (isset($a->callstack["dache"])) {
+					$o .= "\nCache Read:\n";
+					foreach ($a->callstack["dache"] as $func => $time) {
+						$time = round($time, 3);
+						if ($time > 0) {
+							$o .= $func.": ".$time."\n";
+						}
+					}
+				}
+				if (isset($a->callstack["dache_write"])) {
+					$o .= "\nCache Write:\n";
+					foreach ($a->callstack["dache_write"] as $func => $time) {
 						$time = round($time, 3);
 						if ($time > 0) {
 							$o .= $func.": ".$time."\n";
@@ -392,25 +431,31 @@ class Worker {
 				}
 				if (isset($a->callstack["network"])) {
 					$o .= "\nNetwork:\n";
-					foreach ($a->callstack["network"] AS $func => $time) {
+					foreach ($a->callstack["network"] as $func => $time) {
 						$time = round($time, 3);
 						if ($time > 0) {
 							$o .= $func.": ".$time."\n";
 						}
 					}
 				}
-			} else {
-				$o = '';
 			}
 
-			logger("ID ".$queue["id"].": ".$funcname.": ".sprintf("DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
-				number_format($a->performance["database"] - $a->performance["database_write"], 2),
-				number_format($a->performance["database_write"], 2),
-				number_format($a->performance["network"], 2),
-				number_format($a->performance["file"], 2),
-				number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
-				number_format($duration, 2)),
-				LOGGER_DEBUG);
+			logger(
+				"ID ".$queue["id"].": ".$funcname.": ".sprintf(
+					"DB: %s/%s, Cache: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
+					number_format($a->performance["database"] - $a->performance["database_write"], 2),
+					number_format($a->performance["database_write"], 2),
+					number_format($a->performance["cache"], 2),
+					number_format($a->performance["cache_write"], 2),
+					number_format($a->performance["network"], 2),
+					number_format($a->performance["file"], 2),
+					number_format($duration - ($a->performance["database"]
+						+ $a->performance["cache"] + $a->performance["cache_write"]
+						+ $a->performance["network"] + $a->performance["file"]), 2),
+					number_format($duration, 2)
+				),
+				LOGGER_DEBUG
+			);
 		}
 
 		$cooldown = Config::get("system", "worker_cooldown", 0);
@@ -426,8 +471,8 @@ class Worker {
 	 *
 	 * @return bool Are more than 3/4 of the maximum connections used?
 	 */
-	private static function maxConnectionsReached() {
-
+	private static function maxConnectionsReached()
+	{
 		// Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
 		$max = Config::get("system", "max_connections");
 
@@ -436,13 +481,13 @@ class Worker {
 
 		if ($max == 0) {
 			// the maximum number of possible user connections can be a system variable
-			$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
-			if (DBM::is_result($r)) {
+			$r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
+			if (DBA::isResult($r)) {
 				$max = $r["Value"];
 			}
 			// Or it can be granted. This overrides the system variable
-			$r = dba::p('SHOW GRANTS');
-			while ($grants = dba::fetch($r)) {
+			$r = DBA::p('SHOW GRANTS');
+			while ($grants = DBA::fetch($r)) {
 				$grant = array_pop($grants);
 				if (stristr($grant, "GRANT USAGE ON")) {
 					if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
@@ -450,15 +495,15 @@ class Worker {
 					}
 				}
 			}
-			dba::close($r);
+			DBA::close($r);
 		}
 
 		// If $max is set we will use the processlist to determine the current number of connections
 		// The processlist only shows entries of the current user
 		if ($max != 0) {
-			$r = dba::p('SHOW PROCESSLIST');
-			$used = dba::num_rows($r);
-			dba::close($r);
+			$r = DBA::p('SHOW PROCESSLIST');
+			$used = DBA::numRows($r);
+			DBA::close($r);
 
 			logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
 
@@ -472,16 +517,16 @@ class Worker {
 
 		// We will now check for the system values.
 		// This limit could be reached although the user limits are fine.
-		$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
-		if (!DBM::is_result($r)) {
+		$r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
+		if (!DBA::isResult($r)) {
 			return false;
 		}
 		$max = intval($r["Value"]);
 		if ($max == 0) {
 			return false;
 		}
-		$r = dba::fetch_first("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
-		if (!DBM::is_result($r)) {
+		$r = DBA::fetchFirst("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
+		if (!DBA::isResult($r)) {
 			return false;
 		}
 		$used = intval($r["Value"]);
@@ -501,39 +546,48 @@ class Worker {
 
 	/**
 	 * @brief fix the queue entry if the worker process died
-	 *
+	 * @return void
 	 */
-	private static function killStaleWorkers() {
-		$entries = dba::select('workerqueue', array('id', 'pid', 'executed', 'priority', 'parameter'),
-					array('`executed` > ? AND NOT `done` AND `pid` != 0', NULL_DATE),
-					array('order' => array('priority', 'created')));
-		while ($entry = dba::fetch($entries)) {
+	private static function killStaleWorkers()
+	{
+		$entries = DBA::select(
+			'workerqueue',
+			['id', 'pid', 'executed', 'priority', 'parameter'],
+			['`executed` > ? AND NOT `done` AND `pid` != 0', NULL_DATE],
+			['order' => ['priority', 'created']]
+		);
+
+		while ($entry = DBA::fetch($entries)) {
 			if (!posix_kill($entry["pid"], 0)) {
-				dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0),
-						array('id' => $entry["id"]));
+				DBA::update(
+					'workerqueue',
+					['executed' => NULL_DATE, 'pid' => 0],
+					['id' => $entry["id"]]
+				);
 			} else {
 				// Kill long running processes
 				// Check if the priority is in a valid range
-				if (!in_array($entry["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
+				if (!in_array($entry["priority"], [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE])) {
 					$entry["priority"] = PRIORITY_MEDIUM;
 				}
 
 				// Define the maximum durations
-				$max_duration_defaults = array(PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720);
+				$max_duration_defaults = [PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720];
 				$max_duration = $max_duration_defaults[$entry["priority"]];
 
-				$argv = json_decode($entry["parameter"]);
+				$argv = json_decode($entry["parameter"], true);
 				$argv[0] = basename($argv[0]);
 
 				// How long is the process already running?
 				$duration = (time() - strtotime($entry["executed"])) / 60;
 				if ($duration > $max_duration) {
-					logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
+					logger("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") took more than ".$max_duration." minutes. It will be killed now.");
 					posix_kill($entry["pid"], SIGTERM);
 
 					// We killed the stale process.
 					// To avoid a blocking situation we reschedule the process at the beginning of the queue.
 					// Additionally we are lowering the priority. (But not PRIORITY_CRITICAL)
+					$new_priority = $entry["priority"];
 					if ($entry["priority"] == PRIORITY_HIGH) {
 						$new_priority = PRIORITY_MEDIUM;
 					} elseif ($entry["priority"] == PRIORITY_MEDIUM) {
@@ -541,11 +595,13 @@ class Worker {
 					} elseif ($entry["priority"] != PRIORITY_CRITICAL) {
 						$new_priority = PRIORITY_NEGLIGIBLE;
 					}
-					dba::update('workerqueue',
-							array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => $new_priority, 'pid' => 0),
-							array('id' => $entry["id"]));
+					DBA::update(
+						'workerqueue',
+						['executed' => NULL_DATE, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
+						['id' => $entry["id"]]
+					);
 				} else {
-					logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
+					logger("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 				}
 			}
 		}
@@ -556,7 +612,8 @@ class Worker {
 	 *
 	 * @return bool Are there too much workers running?
 	 */
-	public static function tooMuchWorkers() {
+	public static function tooMuchWorkers()
+	{
 		$queues = Config::get("system", "worker_queues", 4);
 
 		$maxqueues = $queues;
@@ -564,49 +621,57 @@ class Worker {
 		$active = self::activeWorkers();
 
 		// Decrease the number of workers at higher load
-		$load = current_load();
+		$load = System::currentLoad();
 		if ($load) {
 			$maxsysload = intval(Config::get("system", "maxloadavg", 50));
 
-			$maxworkers = $queues;
+			/* Default exponent 3 causes queues to rapidly decrease as load increases.
+			 * If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
+			 * For some environments, this rapid decrease is not needed.
+			 * With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
+			 */
+			$exponent = intval(Config::get('system', 'worker_load_exponent', 3));
+			$slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
+			$queues = intval(ceil($slope * $maxqueues));
 
-			// Some magical mathemathics to reduce the workers
-			$exponent = 3;
-			$slope = $maxworkers / pow($maxsysload, $exponent);
-			$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
+			$processlist = '';
 
 			if (Config::get('system', 'worker_debug')) {
 				// Create a list of queue entries grouped by their priority
-				$listitem = array();
+				$listitem = [];
 
 				// Adding all processes with no workerqueue entry
-				$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
+				$processes = DBA::p(
+					"SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
 							(SELECT id FROM `workerqueue`
-							WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)", getmypid());
-				if ($process = dba::fetch($processes)) {
+							WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)",
+					getmypid()
+				);
+
+				if ($process = DBA::fetch($processes)) {
 					$listitem[0] = "0:".$process["running"];
 				}
-				dba::close($processes);
+				DBA::close($processes);
 
 				// Now adding all processes with workerqueue entries
-				$entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
-				while ($entry = dba::fetch($entries)) {
-					$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
-					if ($process = dba::fetch($processes)) {
+				$entries = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
+				while ($entry = DBA::fetch($entries)) {
+					$processes = DBA::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
+					if ($process = DBA::fetch($processes)) {
 						$listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 					}
-					dba::close($processes);
+					DBA::close($processes);
 				}
-				dba::close($entries);
+				DBA::close($entries);
 
-				$intervals = array(1, 10, 60);
-				$jobs_per_minute = array();
-				foreach ($intervals AS $interval) {
-					$jobs = dba::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
-					if ($job = dba::fetch($jobs)) {
+				$intervals = [1, 10, 60];
+				$jobs_per_minute = [];
+				foreach ($intervals as $interval) {
+					$jobs = DBA::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
+					if ($job = DBA::fetch($jobs)) {
 						$jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
 					}
-					dba::close($jobs);
+					DBA::close($jobs);
 				}
 				$processlist = ' - jpm: '.implode('/', $jobs_per_minute).' ('.implode(', ', $listitem).')';
 			}
@@ -626,13 +691,22 @@ class Worker {
 			logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
 
 			// Are there fewer workers running as possible? Then fork a new one.
-			if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
+			if (!Config::get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && ($entries > 1)) {
 				logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
-				self::spawnWorker();
+				if (Config::get('system', 'worker_daemon_mode', false)) {
+					self::IPCSetJobState(true);
+				} else {
+					self::spawnWorker();
+				}
 			}
 		}
 
-		return $active >= $queues;
+		// if there are too much worker, we don't spawn a new one.
+		if (Config::get('system', 'worker_daemon_mode', false) && ($active > $queues)) {
+			self::IPCSetJobState(false);
+		}
+
+		return $active > $queues;
 	}
 
 	/**
@@ -640,10 +714,9 @@ class Worker {
 	 *
 	 * @return integer Number of active worker processes
 	 */
-	private static function activeWorkers() {
-		$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'Worker.php'");
-
-		return $workers["processes"];
+	private static function activeWorkers()
+	{
+		return DBA::count('process', ['command' => 'Worker.php']);
 	}
 
 	/**
@@ -655,22 +728,25 @@ class Worker {
 	 * @param string $highest_priority Returns the currently highest priority
 	 * @return bool We let pass a slower process than $highest_priority
 	 */
-	private static function passingSlow(&$highest_priority) {
+	private static function passingSlow(&$highest_priority)
+	{
 		$highest_priority = 0;
 
-		$r = dba::p("SELECT `priority`
+		$r = DBA::p(
+			"SELECT `priority`
 				FROM `process`
-				INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`");
+				INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`"
+		);
 
 		// No active processes at all? Fine
-		if (!DBM::is_result($r)) {
+		if (!DBA::isResult($r)) {
 			return false;
 		}
-		$priorities = array();
-		while ($line = dba::fetch($r)) {
+		$priorities = [];
+		while ($line = DBA::fetch($r)) {
 			$priorities[] = $line["priority"];
 		}
-		dba::close($r);
+		DBA::close($r);
 
 		// Should not happen
 		if (count($priorities) == 0) {
@@ -684,7 +760,7 @@ class Worker {
 			return false;
 		}
 		$high = 0;
-		foreach ($priorities AS $priority) {
+		foreach ($priorities as $priority) {
 			if ($priority == $highest_priority) {
 				++$high;
 			}
@@ -704,7 +780,8 @@ class Worker {
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
 	 * @return boolean Have we found something?
 	 */
-	private static function findWorkerProcesses(&$passing_slow) {
+	private static function findWorkerProcesses(&$passing_slow)
+	{
 		$mypid = getmypid();
 
 		// Check if we should pass some low priority process
@@ -725,28 +802,38 @@ class Worker {
 		$limit = min($queue_length, ceil($slope * pow($jobs, $exponent)));
 
 		logger('Total: '.$jobs.' - Maximum: '.$queue_length.' - jobs per queue: '.$limit, LOGGER_DEBUG);
-
+		$ids = [];
 		if (self::passingSlow($highest_priority)) {
 			// Are there waiting processes with a higher priority than the currently highest?
-			$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND `priority` < ? AND NOT `done`", NULL_DATE, $highest_priority),
-					array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
-
-			while ($id = dba::fetch($result)) {
+			$result = DBA::select(
+				'workerqueue',
+				['id'],
+				["`executed` <= ? AND `priority` < ? AND NOT `done` AND `next_try` < ?",
+				NULL_DATE, $highest_priority, DateTimeFormat::utcNow()],
+				['limit' => $limit, 'order' => ['priority', 'created']]
+			);
+
+			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
 			}
-			dba::close($result);
+			DBA::close($result);
 
 			$found = (count($ids) > 0);
 
 			if (!$found) {
 				// Give slower processes some processing time
-				$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND `priority` > ? AND NOT `done`", NULL_DATE, $highest_priority),
-						array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
-
-				while ($id = dba::fetch($result)) {
+				$result = DBA::select(
+					'workerqueue',
+					['id'],
+					["`executed` <= ? AND `priority` > ? AND NOT `done` AND `next_try` < ?",
+					NULL_DATE, $highest_priority, DateTimeFormat::utcNow()],
+					['limit' => $limit, 'order' => ['priority', 'created']]
+				);
+
+				while ($id = DBA::fetch($result)) {
 					$ids[] = $id["id"];
 				}
-				dba::close($result);
+				DBA::close($result);
 
 				$found = (count($ids) > 0);
 				$passing_slow = $found;
@@ -755,13 +842,18 @@ class Worker {
 
 		// If there is no result (or we shouldn't pass lower processes) we check without priority limit
 		if (!$found) {
-			$result = dba::select('workerqueue', array('id'), array("`executed` <= ? AND NOT `done`", NULL_DATE),
-					array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true));
-
-			while ($id = dba::fetch($result)) {
+			$result = DBA::select(
+				'workerqueue',
+				['id'],
+				["`executed` <= ? AND NOT `done` AND `next_try` < ?",
+				NULL_DATE, DateTimeFormat::utcNow()],
+				['limit' => $limit, 'order' => ['priority', 'created']]
+			);
+
+			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
 			}
-			dba::close($result);
+			DBA::close($result);
 
 			$found = (count($ids) > 0);
 		}
@@ -769,7 +861,7 @@ class Worker {
 		if ($found) {
 			$condition = "`id` IN (".substr(str_repeat("?, ", count($ids)), 0, -2).") AND `pid` = 0 AND NOT `done`";
 			array_unshift($ids, $condition);
-			dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid), $ids);
+			DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $mypid], $ids);
 		}
 
 		return $found;
@@ -781,19 +873,20 @@ class Worker {
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
 	 * @return string SQL statement
 	 */
-	public static function workerProcess(&$passing_slow) {
+	public static function workerProcess(&$passing_slow)
+	{
 		$stamp = (float)microtime(true);
 
 		// There can already be jobs for us in the queue.
-		$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
-		if (DBM::is_result($r)) {
+		$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+		if (DBA::isResult($r)) {
 			self::$db_duration += (microtime(true) - $stamp);
-			return dba::inArray($r);
+			return DBA::toArray($r);
 		}
-		dba::close($r);
+		DBA::close($r);
 
 		$stamp = (float)microtime(true);
-		if (!Lock::set('poller_worker_process')) {
+		if (!Lock::acquire('worker_process')) {
 			return false;
 		}
 		self::$lock_duration = (microtime(true) - $stamp);
@@ -802,40 +895,46 @@ class Worker {
 		$found = self::findWorkerProcesses($passing_slow);
 		self::$db_duration += (microtime(true) - $stamp);
 
-		Lock::remove('poller_worker_process');
+		Lock::release('worker_process');
 
 		if ($found) {
-			$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
-			return dba::inArray($r);
+			$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+			return DBA::toArray($r);
 		}
 		return false;
 	}
 
 	/**
 	 * @brief Removes a workerqueue entry from the current process
+	 * @return void
 	 */
-	public static function unclaimProcess() {
+	public static function unclaimProcess()
+	{
 		$mypid = getmypid();
 
-		dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid, 'done' => false));
+		DBA::update('workerqueue', ['executed' => NULL_DATE, 'pid' => 0], ['pid' => $mypid, 'done' => false]);
 	}
 
 	/**
 	 * @brief Call the front end worker
+	 * @return void
 	 */
-	public static function callWorker() {
+	public static function callWorker()
+	{
 		if (!Config::get("system", "frontend_worker")) {
 			return;
 		}
 
 		$url = System::baseUrl()."/worker";
-		fetch_url($url, false, $redirects, 1);
+		Network::fetchUrl($url, false, $redirects, 1);
 	}
 
 	/**
 	 * @brief Call the front end worker if there aren't any active
+	 * @return void
 	 */
-	public static function executeIfIdle() {
+	public static function executeIfIdle()
+	{
 		if (!Config::get("system", "frontend_worker")) {
 			return;
 		}
@@ -854,7 +953,7 @@ class Worker {
 			if (self::tooMuchWorkers()) {
 				// Cleaning dead processes
 				self::killStaleWorkers();
-				get_app()->remove_inactive_processes();
+				Process::deleteInactive();
 
 				return;
 			}
@@ -873,29 +972,33 @@ class Worker {
 
 		self::clearProcesses();
 
-		$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
+		$workers = self::activeWorkers();
 
-		if ($workers["processes"] == 0) {
+		if ($workers == 0) {
 			self::callWorker();
 		}
 	}
 
 	/**
 	 * @brief Removes long running worker processes
+	 * @return void
 	 */
-	public static function clearProcesses() {
+	public static function clearProcesses()
+	{
 		$timeout = Config::get("system", "frontend_worker_timeout", 10);
 
 		/// @todo We should clean up the corresponding workerqueue entries as well
-		$condition = array("`created` < ? AND `command` = 'worker.php'",
-				datetime_convert('UTC','UTC',"now - ".$timeout." minutes"));
-		dba::delete('process', $condition);
+		$condition = ["`created` < ? AND `command` = 'worker.php'",
+				DateTimeFormat::utc("now - ".$timeout." minutes")];
+		DBA::delete('process', $condition);
 	}
 
 	/**
 	 * @brief Runs the cron processes
+	 * @return void
 	 */
-	private static function runCron() {
+	private static function runCron()
+	{
 		logger('Add cron entries', LOGGER_DEBUG);
 
 		// Check for spooled items
@@ -904,16 +1007,26 @@ class Worker {
 		// Run the cron job that calls all other jobs
 		self::add(PRIORITY_MEDIUM, "Cron");
 
-		// Run the cronhooks job separately from cron for being able to use a different timing
-		self::add(PRIORITY_MEDIUM, "CronHooks");
-
 		// Cleaning dead processes
 		self::killStaleWorkers();
 	}
 
-	public static function spawnWorker() {
-		$args = array("scripts/worker.php", "no_cron");
-		get_app()->proc_run($args);
+	/**
+	 * @brief Spawns a new worker
+	 * @return void
+	 */
+	public static function spawnWorker($do_cron = false)
+	{
+		$command = 'bin/worker.php';
+
+		$args = ['no_cron' => !$do_cron];
+
+		get_app()->proc_run($command, $args);
+
+		// after spawning we have to remove the flag.
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			self::IPCSetJobState(false);
+		}
 	}
 
 	/**
@@ -932,43 +1045,26 @@ class Worker {
 	 *
 	 * @return boolean "false" if proc_run couldn't be executed
 	 */
-	public static function add($cmd) {
-		$proc_args = func_get_args();
+	public static function add($cmd)
+	{
+		$args = func_get_args();
 
-		$args = array();
-		if (!count($proc_args)) {
+		if (!count($args)) {
 			return false;
 		}
 
-		// Preserve the first parameter
-		// It could contain a command, the priority or an parameter array
-		// If we use the parameter array we have to protect it from the following function
-		$run_parameter = array_shift($proc_args);
-
-		// expand any arrays
-		foreach ($proc_args as $arg) {
-			if (is_array($arg)) {
-				foreach ($arg as $n) {
-					$args[] = $n;
-				}
-			} else {
-				$args[] = $arg;
-			}
-		}
-
-		// Now we add the run parameters back to the array
-		array_unshift($args, $run_parameter);
-
-		$arr = array('args' => $args, 'run_cmd' => true);
+		$arr = ['args' => $args, 'run_cmd' => true];
 
-		call_hooks("proc_run", $arr);
+		Addon::callHooks("proc_run", $arr);
 		if (!$arr['run_cmd'] || !count($args)) {
 			return true;
 		}
 
 		$priority = PRIORITY_MEDIUM;
-		$dont_fork = Config::get("system", "worker_dont_fork");
-		$created = datetime_convert();
+		$dont_fork = Config::get("system", "worker_dont_fork", false);
+		$created = DateTimeFormat::utcNow();
+
+		$run_parameter = array_shift($args);
 
 		if (is_int($run_parameter)) {
 			$priority = $run_parameter;
@@ -984,19 +1080,16 @@ class Worker {
 			}
 		}
 
-		$argv = $args;
-		array_shift($argv);
-
-		$parameters = json_encode($argv);
-		$found = dba::exists('workerqueue', array('parameter' => $parameters, 'done' => false));
+		$parameters = json_encode($args);
+		$found = DBA::exists('workerqueue', ['parameter' => $parameters, 'done' => false]);
 
 		// Quit if there was a database error - a precaution for the update process to 3.5.3
-		if (dba::errorNo() != 0) {
+		if (DBA::errorNo() != 0) {
 			return false;
 		}
 
 		if (!$found) {
-			dba::insert('workerqueue', array('parameter' => $parameters, 'created' => $created, 'priority' => $priority));
+			DBA::insert('workerqueue', ['parameter' => $parameters, 'created' => $created, 'priority' => $priority]);
 		}
 
 		// Should we quit and wait for the worker to be called as a cronjob?
@@ -1005,21 +1098,112 @@ class Worker {
 		}
 
 		// If there is a lock then we don't have to check for too much worker
-		if (!Lock::set('poller_worker', 0)) {
+		if (!Lock::acquire('worker', 0)) {
 			return true;
 		}
 
 		// If there are already enough workers running, don't fork another one
 		$quit = self::tooMuchWorkers();
-		Lock::remove('poller_worker');
+		Lock::release('worker');
 
 		if ($quit) {
 			return true;
 		}
 
+		// We tell the daemon that a new job entry exists
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			// We don't have to set the IPC flag - this is done in "tooMuchWorkers"
+			return true;
+		}
+
 		// Now call the worker to execute the jobs that we just added to the queue
 		self::spawnWorker();
 
 		return true;
 	}
+
+	/**
+	 * Defers the current worker entry
+	 */
+	public static function defer()
+	{
+		if (empty(BaseObject::getApp()->queue)) {
+			return;
+		}
+
+		$queue = BaseObject::getApp()->queue;
+
+		$retrial = $queue['retrial'];
+		$id = $queue['id'];
+
+		if ($retrial > 14) {
+			logger('Id ' . $id . ' had been tried 14 times, it will be deleted now.', LOGGER_DEBUG);
+			DBA::delete('workerqueue', ['id' => $id]);
+		}
+
+		// Calculate the delay until the next trial
+		$delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
+		$next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
+
+		logger('Defer execution ' . $retrial . ' of id ' . $id . ' to ' . $next, LOGGER_DEBUG);
+
+		$fields = ['retrial' => $retrial + 1, 'next_try' => $next, 'executed' => NULL_DATE, 'pid' => 0];
+		DBA::update('workerqueue', $fields, ['id' => $id]);
+	}
+
+	/**
+	 * Log active processes into the "process" table
+	 *
+	 * @brief Log active processes into the "process" table
+	 */
+	public static function startProcess()
+	{
+		$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1);
+
+		$command = basename($trace[0]['file']);
+
+		Process::deleteInactive();
+
+		Process::insert($command);
+	}
+
+	/**
+	 * Remove the active process from the "process" table
+	 *
+	 * @brief Remove the active process from the "process" table
+	 * @return bool
+	 */
+	public static function endProcess()
+	{
+		return Process::deleteByPid();
+	}
+
+	/**
+	 * Set the flag if some job is waiting
+	 *
+	 * @brief Set the flag if some job is waiting
+	 * @param boolean $jobs Is there a waiting job?
+	 */
+	public static function IPCSetJobState($jobs)
+	{
+		DBA::update('worker-ipc', ['jobs' => $jobs], ['key' => 1], true);
+	}
+
+	/**
+	 * Checks if some worker job waits to be executed
+	 *
+	 * @brief Checks if some worker job waits to be executed
+	 * @return bool
+	 */
+	public static function IPCJobsExists()
+	{
+		$row = DBA::selectFirst('worker-ipc', ['jobs'], ['key' => 1]);
+
+		// When we don't have a row, no job is running
+		if (!DBA::isResult($row)) {
+			return false;
+		}
+
+		return (bool)$row['jobs'];
+	}
 }