268 lines
7.4 KiB
PHP
268 lines
7.4 KiB
PHP
<?php
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if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
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$directory = dirname($_SERVER["argv"][0]);
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if (substr($directory, 0, 1) != "/")
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$directory = $_SERVER["PWD"]."/".$directory;
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$directory = realpath($directory."/..");
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chdir($directory);
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}
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require_once("boot.php");
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function poller_run(&$argv, &$argc){
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global $a, $db;
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if(is_null($a)) {
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$a = new App;
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}
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if(is_null($db)) {
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@include(".htconfig.php");
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require_once("include/dba.php");
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$db = new dba($db_host, $db_user, $db_pass, $db_data);
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unset($db_host, $db_user, $db_pass, $db_data);
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};
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if (poller_max_connections_reached())
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return;
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$load = current_load();
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if($load) {
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$maxsysload = intval(get_config('system','maxloadavg'));
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if($maxsysload < 1)
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$maxsysload = 50;
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if(intval($load) > $maxsysload) {
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logger('system: load ' . $load . ' too high. poller deferred to next scheduled run.');
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return;
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}
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}
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// Checking the number of workers
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if (poller_too_much_workers(1)) {
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poller_kill_stale_workers();
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return;
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}
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if(($argc <= 1) OR ($argv[1] != "no_cron")) {
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// Run the cron job that calls all other jobs
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proc_run("php","include/cron.php");
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// Run the cronhooks job separately from cron for being able to use a different timing
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proc_run("php","include/cronhooks.php");
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// Cleaning dead processes
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poller_kill_stale_workers();
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} else
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// Sleep four seconds before checking for running processes again to avoid having too many workers
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sleep(4);
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// Checking number of workers
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if (poller_too_much_workers(2))
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return;
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$starttime = time();
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while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
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// Constantly check the number of available database connections to let the frontend be accessible at any time
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if (poller_max_connections_reached())
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return;
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// Count active workers and compare them with a maximum value that depends on the load
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if (poller_too_much_workers(3))
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return;
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q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
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dbesc(datetime_convert()),
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intval(getmypid()),
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intval($r[0]["id"]));
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// Assure that there are no tasks executed twice
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$id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
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intval($r[0]["id"]),
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intval(getmypid()));
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if (!$id) {
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logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
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continue;
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}
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$argv = json_decode($r[0]["parameter"]);
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$argc = count($argv);
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// Check for existance and validity of the include file
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$include = $argv[0];
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if (!validate_include($include)) {
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logger("Include file ".$argv[0]." is not valid!");
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q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
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continue;
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}
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require_once($include);
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$funcname=str_replace(".php", "", basename($argv[0]))."_run";
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if (function_exists($funcname)) {
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logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
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$funcname($argv, $argc);
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logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
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q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
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} else
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logger("Function ".$funcname." does not exist");
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// Quit the poller once every hour
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if (time() > ($starttime + 3600))
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return;
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}
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}
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/**
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* @brief Checks if the number of database connections has reached a critical limit.
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*
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* @return bool Are more than 3/4 of the maximum connections used?
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*/
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function poller_max_connections_reached() {
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// Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
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$max = get_config("system", "max_connections");
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if ($max == 0) {
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// the maximum number of possible user connections can be a system variable
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$r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
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if ($r)
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$max = $r[0]["Value"];
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// Or it can be granted. This overrides the system variable
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$r = q("SHOW GRANTS");
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if ($r)
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foreach ($r AS $grants) {
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$grant = array_pop($grants);
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if (stristr($grant, "GRANT USAGE ON"))
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if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
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$max = $match[1];
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}
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}
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// If $max is set we will use the processlist to determine the current number of connections
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// The processlist only shows entries of the current user
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if ($max != 0) {
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$r = q("SHOW PROCESSLIST");
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if (!$r)
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return false;
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$used = count($r);
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logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
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$level = $used / $max;
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if ($level >= (3/4)) {
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logger("Maximum level (3/4) of user connections reached: ".$used."/".$max);
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return true;
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}
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}
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// We will now check for the system values.
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// This limit could be reached although the user limits are fine.
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$r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
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if (!$r)
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return false;
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$max = intval($r[0]["Value"]);
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if ($max == 0)
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return false;
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$r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
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if (!$r)
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return false;
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$used = intval($r[0]["Value"]);
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if ($used == 0)
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return false;
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logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
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$level = $used / $max;
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if ($level < (3/4))
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return false;
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logger("Maximum level (3/4) of system connections reached: ".$used."/".$max);
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return true;
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}
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/**
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* @brief fix the queue entry if the worker process died
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*
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*/
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function poller_kill_stale_workers() {
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$r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
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foreach($r AS $pid)
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if (!posix_kill($pid["pid"], 0))
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q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
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intval($pid["pid"]));
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else {
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// Kill long running processes
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$duration = (time() - strtotime($pid["executed"])) / 60;
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if ($duration > 180) {
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logger("Worker process ".$pid["pid"]." took more than 3 hours. It will be killed now.");
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posix_kill($pid["pid"], SIGTERM);
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// Question: If a process is stale: Should we remove it or should we reschedule it?
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// By now we rescheduling it. It's maybe not the wisest decision?
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q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
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intval($pid["pid"]));
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} else
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logger("Worker process ".$pid["pid"]." now runs for ".round($duration)." minutes. That's okay.", LOGGER_DEBUG);
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}
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}
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function poller_too_much_workers($stage) {
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$queues = get_config("system", "worker_queues");
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if ($queues == 0)
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$queues = 4;
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$active = poller_active_workers();
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// Decrease the number of workers at higher load
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$load = current_load();
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if($load) {
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$maxsysload = intval(get_config('system','maxloadavg'));
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if($maxsysload < 1)
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$maxsysload = 50;
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$maxworkers = $queues;
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// Some magical mathemathics to reduce the workers
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$exponent = 3;
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$slope = $maxworkers / pow($maxsysload, $exponent);
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$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
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logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
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}
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return($active >= $queues);
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}
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function poller_active_workers() {
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$workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
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return($workers[0]["workers"]);
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}
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if (array_search(__file__,get_included_files())===0){
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poller_run($_SERVER["argv"],$_SERVER["argc"]);
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killme();
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}
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?>
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