X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=include%2Fpoller.php;h=2e036247e237cf06c40d5f514300b2c57e1a1525;hb=05f71f4a701ece84cb435e7e9a37cc52ae7ce0d6;hp=d134f30d0fac270001d5cac8d9e98bc1411d81d7;hpb=598a9f76a68668cb13073e6832138869435ba5ee;p=friendica.git

diff --git a/include/poller.php b/include/poller.php
index d134f30d0f..2e036247e2 100644
--- a/include/poller.php
+++ b/include/poller.php
@@ -10,6 +10,9 @@ if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
 	chdir($directory);
 }
 
+use \Friendica\Core\Config;
+use \Friendica\Core\PConfig;
+
 require_once("boot.php");
 
 function poller_run(&$argv, &$argc){
@@ -26,6 +29,14 @@ function poller_run(&$argv, &$argc){
 		unset($db_host, $db_user, $db_pass, $db_data);
 	};
 
+	// Quit when in maintenance
+	if (get_config('system', 'maintenance', true))
+		return;
+
+	$a->start_process();
+
+	$mypid = getmypid();
+
 	if ($a->max_processes_reached())
 		return;
 
@@ -36,17 +47,17 @@ function poller_run(&$argv, &$argc){
 		return;
 
 	// Checking the number of workers
-	if (poller_too_much_workers(1)) {
+	if (poller_too_much_workers()) {
 		poller_kill_stale_workers();
 		return;
 	}
 
 	if(($argc <= 1) OR ($argv[1] != "no_cron")) {
 		// Run the cron job that calls all other jobs
-		proc_run("php","include/cron.php");
+		proc_run(PRIORITY_MEDIUM, "include/cron.php");
 
 		// Run the cronhooks job separately from cron for being able to use a different timing
-		proc_run("php","include/cronhooks.php");
+		proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
 
 		// Cleaning dead processes
 		poller_kill_stale_workers();
@@ -55,12 +66,18 @@ function poller_run(&$argv, &$argc){
 		sleep(4);
 
 	// Checking number of workers
-	if (poller_too_much_workers(2))
+	if (poller_too_much_workers())
 		return;
 
+	$cooldown = Config::get("system", "worker_cooldown", 0);
+
 	$starttime = time();
 
-	while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
+	while ($r = poller_worker_process()) {
+
+		// Quit when in maintenance
+		if (get_config('system', 'maintenance', true))
+			return;
 
 		// Constantly check the number of parallel database processes
 		if ($a->max_processes_reached())
@@ -71,22 +88,36 @@ function poller_run(&$argv, &$argc){
 			return;
 
 		// Count active workers and compare them with a maximum value that depends on the load
-		if (poller_too_much_workers(3))
+		if (poller_too_much_workers())
 			return;
 
-		q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
+		$upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
 			dbesc(datetime_convert()),
-			intval(getmypid()),
+			intval($mypid),
 			intval($r[0]["id"]));
 
+		if (!$upd) {
+			logger("Couldn't update queue entry ".$r[0]["id"]." - skip this execution", LOGGER_DEBUG);
+			q("COMMIT");
+			continue;
+		}
+
 		// Assure that there are no tasks executed twice
-		$id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
-			intval($r[0]["id"]),
-			intval(getmypid()));
+		$id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
 		if (!$id) {
-			logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
+			logger("Queue item ".$r[0]["id"]." vanished - skip this execution", LOGGER_DEBUG);
+			q("COMMIT");
+			continue;
+		} elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
+			logger("Entry for queue item ".$r[0]["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
+			q("COMMIT");
+			continue;
+		} elseif ($id[0]["pid"] != $mypid) {
+			logger("Queue item ".$r[0]["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
+			q("COMMIT");
 			continue;
 		}
+		q("COMMIT");
 
 		$argv = json_decode($r[0]["parameter"]);
 
@@ -103,13 +134,26 @@ function poller_run(&$argv, &$argc){
 
 		require_once($include);
 
-		$funcname=str_replace(".php", "", basename($argv[0]))."_run";
+		$funcname = str_replace(".php", "", basename($argv[0]))."_run";
 
 		if (function_exists($funcname)) {
-			logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
+			logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
+
+			// For better logging create a new process id for every worker call
+			// But preserve the old one for the worker
+			$old_process_id = $a->process_id;
+			$a->process_id = uniqid("wrk", true);
+
 			$funcname($argv, $argc);
 
-			logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
+			$a->process_id = $old_process_id;
+
+			if ($cooldown > 0) {
+				logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
+				sleep($cooldown);
+			}
+
+			logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - done");
 
 			q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
 		} else
@@ -207,7 +251,7 @@ function poller_max_connections_reached() {
  *
  */
 function poller_kill_stale_workers() {
-	$r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
+	$r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
 
 	if (!dbm::is_result($r)) {
 		// No processing here needed
@@ -220,27 +264,47 @@ function poller_kill_stale_workers() {
 				intval($pid["pid"]));
 		else {
 			// Kill long running processes
+
+			// Check if the priority is in a valid range
+			if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
+				$pid["priority"] = PRIORITY_MEDIUM;
+
+			// Define the maximum durations
+			$max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
+			$max_duration = $max_duration_defaults[$pid["priority"]];
+
+			$argv = json_decode($pid["parameter"]);
+			$argv[0] = basename($argv[0]);
+
+			// How long is the process already running?
 			$duration = (time() - strtotime($pid["executed"])) / 60;
-			if ($duration > 180) {
-				logger("Worker process ".$pid["pid"]." took more than 3 hours. It will be killed now.");
+			if ($duration > $max_duration) {
+				logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
 				posix_kill($pid["pid"], SIGTERM);
 
-				// Question: If a process is stale: Should we remove it or should we reschedule it?
-				// By now we rescheduling it. It's maybe not the wisest decision?
-				q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
+				// 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.
+				q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `created` = '%s',
+							`priority` = %d, `pid` = 0 WHERE `pid` = %d",
+					dbesc(datetime_convert()),
+					intval(PRIORITY_NEGLIGIBLE),
 					intval($pid["pid"]));
 			} else
-				logger("Worker process ".$pid["pid"]." now runs for ".round($duration)." minutes. That's okay.", LOGGER_DEBUG);
+				logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
 		}
 }
 
-function poller_too_much_workers($stage) {
+function poller_too_much_workers() {
+
 
 	$queues = get_config("system", "worker_queues");
 
 	if ($queues == 0)
 		$queues = 4;
 
+	$maxqueues = $queues;
+
 	$active = poller_active_workers();
 
 	// Decrease the number of workers at higher load
@@ -257,21 +321,154 @@ function poller_too_much_workers($stage) {
 		$slope = $maxworkers / pow($maxsysload, $exponent);
 		$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
 
-		logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
+		$s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
+		$entries = $s[0]["total"];
+
+		if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
+			$s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
+			$top_priority = $s[0]["priority"];
 
+			$s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00' LIMIT 1",
+				intval($top_priority));
+			$high_running = dbm::is_result($s);
+
+			if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
+				logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
+				$queues = $active + 1;
+			}
+		}
+
+		// Create a list of queue entries grouped by their priority
+		$running = array(PRIORITY_CRITICAL => 0,
+				PRIORITY_HIGH => 0,
+				PRIORITY_MEDIUM => 0,
+				PRIORITY_LOW => 0,
+				PRIORITY_NEGLIGIBLE => 0);
+
+		$r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
+		if (dbm::is_result($r))
+			foreach ($r AS $process)
+				$running[$process["priority"]] = $process["running"];
+
+		$processlist = "";
+		$r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
+		if (dbm::is_result($r))
+			foreach ($r as $entry) {
+				if ($processlist != "")
+					$processlist .= ", ";
+				$processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
+			}
+
+		logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+
+		// Are there fewer workers running as possible? Then fork a new one.
+		if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
+			logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
+			$args = array("php", "include/poller.php", "no_cron");
+			$a = get_app();
+			$a->proc_run($args);
+		}
 	}
 
 	return($active >= $queues);
 }
 
 function poller_active_workers() {
-	$workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
+	$workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
 
-	return($workers[0]["workers"]);
+	return($workers[0]["processes"]);
+}
+
+/**
+ * @brief Check if we should pass some slow processes
+ *
+ * When the active processes of the highest priority are using more than 2/3
+ * of all processes, we let pass slower processes.
+ *
+ * @param string $highest_priority Returns the currently highest priority
+ * @return bool We let pass a slower process than $highest_priority
+ */
+function poller_passing_slow(&$highest_priority) {
+
+	$highest_priority = 0;
+
+	$r = q("SELECT `priority`
+		FROM `process`
+		INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`
+		WHERE `process`.`command` = 'poller.php'");
+
+	// No active processes at all? Fine
+	if (!dbm::is_result($r))
+		return(false);
+
+	$priorities = array();
+	foreach ($r AS $line)
+		$priorities[] = $line["priority"];
+
+	// Should not happen
+	if (count($priorities) == 0)
+		return(false);
+
+	$highest_priority = min($priorities);
+
+	// The highest process is already the slowest one?
+	// Then we quit
+	if ($highest_priority == PRIORITY_NEGLIGIBLE)
+		return(false);
+
+	$high = 0;
+	foreach ($priorities AS $priority)
+		if ($priority == $highest_priority)
+			++$high;
+
+	logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
+	$passing_slow = (($high/count($priorities)) > (2/3));
+
+	if ($passing_slow)
+		logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
+
+	return($passing_slow);
+}
+
+/**
+ * @brief Returns the next worker process
+ *
+ * @return string SQL statement
+ */
+
+function poller_worker_process() {
+
+	q("START TRANSACTION;");
+
+	// Check if we should pass some low priority process
+	$highest_priority = 0;
+
+	if (poller_passing_slow($highest_priority)) {
+		// Are there waiting processes with a higher priority than the currently highest?
+		$r = q("SELECT * FROM `workerqueue`
+				WHERE `executed` = '0000-00-00 00:00:00' AND `priority` < %d
+				ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
+		if (dbm::is_result($r))
+			return $r;
+
+		// Give slower processes some processing time
+		$r = q("SELECT * FROM `workerqueue`
+				WHERE `executed` = '0000-00-00 00:00:00' AND `priority` > %d
+				ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
+	}
+
+	// If there is no result (or we shouldn't pass lower processes) we check without priority limit
+	if (($highest_priority == 0) OR !dbm::is_result($r))
+		$r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1");
+
+	return $r;
 }
 
 if (array_search(__file__,get_included_files())===0){
-  poller_run($_SERVER["argv"],$_SERVER["argc"]);
-  killme();
+	poller_run($_SERVER["argv"],$_SERVER["argc"]);
+
+	get_app()->end_process();
+
+	killme();
 }
 ?>