475 lines
14 KiB
PHP
475 lines
14 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($directory);
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}
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use \Friendica\Core\Config;
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use \Friendica\Core\PConfig;
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require_once("boot.php");
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function poller_run(&$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, $db_data);
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};
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// Quit when in maintenance
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if (get_config('system', 'maintenance', true))
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return;
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$a->start_process();
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$mypid = getmypid();
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if ($a->max_processes_reached())
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return;
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if (poller_max_connections_reached())
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return;
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if (App::maxload_reached())
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return;
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// Checking the number of workers
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if (poller_too_much_workers()) {
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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(PRIORITY_MEDIUM, "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(PRIORITY_MEDIUM, "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())
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return;
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$cooldown = Config::get("system", "worker_cooldown", 0);
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$starttime = time();
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while ($r = poller_worker_process()) {
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// Quit when in maintenance
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if (get_config('system', 'maintenance', true))
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return;
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// Constantly check the number of parallel database processes
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if ($a->max_processes_reached())
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return;
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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())
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return;
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$upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
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dbesc(datetime_convert()),
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intval($mypid),
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intval($r[0]["id"]));
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if (!$upd) {
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logger("Couldn't update queue entry ".$r[0]["id"]." - skip this execution", LOGGER_DEBUG);
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q("COMMIT");
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continue;
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}
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// Assure that there are no tasks executed twice
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$id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
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if (!$id) {
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logger("Queue item ".$r[0]["id"]." vanished - skip this execution", LOGGER_DEBUG);
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q("COMMIT");
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continue;
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} elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
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logger("Entry for queue item ".$r[0]["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
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q("COMMIT");
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continue;
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} elseif ($id[0]["pid"] != $mypid) {
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logger("Queue item ".$r[0]["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
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q("COMMIT");
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continue;
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}
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q("COMMIT");
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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 ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
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// For better logging create a new process id for every worker call
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// But preserve the old one for the worker
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$old_process_id = $a->process_id;
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$a->process_id = uniqid("wrk", true);
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$funcname($argv, $argc);
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$a->process_id = $old_process_id;
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if ($cooldown > 0) {
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logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
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sleep($cooldown);
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}
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logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - 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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// Fetch the percentage level where the poller will get active
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$maxlevel = get_config("system", "max_connections_level");
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if ($maxlevel == 0)
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$maxlevel = 75;
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if ($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 / $max) * 100;
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if ($level >= $maxlevel) {
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logger("Maximum level (".$maxlevel."%) 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 / $max * 100;
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if ($level < $maxlevel)
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return false;
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logger("Maximum level (".$level."%) 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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$r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
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if (!dbm::is_result($r)) {
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// No processing here needed
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return;
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}
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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($pid["pid"]));
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else {
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// Kill long running processes
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// Check if the priority is in a valid range
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if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
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$pid["priority"] = PRIORITY_MEDIUM;
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// Define the maximum durations
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$max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
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$max_duration = $max_duration_defaults[$pid["priority"]];
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$argv = json_decode($pid["parameter"]);
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$argv[0] = basename($argv[0]);
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// How long is the process already running?
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$duration = (time() - strtotime($pid["executed"])) / 60;
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if ($duration > $max_duration) {
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logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
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posix_kill($pid["pid"], SIGTERM);
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// We killed the stale process.
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// To avoid a blocking situation we reschedule the process at the beginning of the queue.
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// Additionally we are lowering the priority.
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q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `created` = '%s',
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`priority` = %d, `pid` = 0 WHERE `pid` = %d",
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dbesc(datetime_convert()),
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intval(PRIORITY_NEGLIGIBLE),
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intval($pid["pid"]));
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} else
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logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
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}
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}
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function poller_too_much_workers() {
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$queues = get_config("system", "worker_queues");
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if ($queues == 0)
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$queues = 4;
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$maxqueues = $queues;
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$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), $exponent));
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$s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
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$entries = $s[0]["total"];
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if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
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$s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
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$top_priority = $s[0]["priority"];
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$s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00' LIMIT 1",
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intval($top_priority));
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$high_running = dbm::is_result($s);
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if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
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logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
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$queues = $active + 1;
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}
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}
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// Create a list of queue entries grouped by their priority
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$running = array(PRIORITY_CRITICAL => 0,
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PRIORITY_HIGH => 0,
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PRIORITY_MEDIUM => 0,
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PRIORITY_LOW => 0,
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PRIORITY_NEGLIGIBLE => 0);
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$r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
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if (dbm::is_result($r))
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foreach ($r AS $process)
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$running[$process["priority"]] = $process["running"];
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$processlist = "";
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$r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
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if (dbm::is_result($r))
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foreach ($r as $entry) {
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if ($processlist != "")
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$processlist .= ", ";
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$processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
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}
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logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
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// Are there fewer workers running as possible? Then fork a new one.
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if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
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logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
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$args = array("php", "include/poller.php", "no_cron");
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$a = get_app();
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$a->proc_run($args);
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}
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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 `processes` FROM `process` WHERE `command` = 'poller.php'");
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return($workers[0]["processes"]);
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}
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/**
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* @brief Check if we should pass some slow processes
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*
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* When the active processes of the highest priority are using more than 2/3
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* of all processes, we let pass slower processes.
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*
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* @param string $highest_priority Returns the currently highest priority
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* @return bool We let pass a slower process than $highest_priority
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*/
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function poller_passing_slow(&$highest_priority) {
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$highest_priority = 0;
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$r = q("SELECT `priority`
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FROM `process`
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INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`
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WHERE `process`.`command` = 'poller.php'");
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// No active processes at all? Fine
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if (!dbm::is_result($r))
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return(false);
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$priorities = array();
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foreach ($r AS $line)
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$priorities[] = $line["priority"];
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// Should not happen
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if (count($priorities) == 0)
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return(false);
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$highest_priority = min($priorities);
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// The highest process is already the slowest one?
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// Then we quit
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if ($highest_priority == PRIORITY_NEGLIGIBLE)
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return(false);
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$high = 0;
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foreach ($priorities AS $priority)
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if ($priority == $highest_priority)
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++$high;
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logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
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$passing_slow = (($high/count($priorities)) > (2/3));
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if ($passing_slow)
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logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
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return($passing_slow);
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}
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/**
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* @brief Returns the next worker process
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*
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* @return string SQL statement
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*/
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function poller_worker_process() {
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q("START TRANSACTION;");
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// Check if we should pass some low priority process
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$highest_priority = 0;
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if (poller_passing_slow($highest_priority)) {
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// Are there waiting processes with a higher priority than the currently highest?
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$r = q("SELECT * FROM `workerqueue`
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WHERE `executed` = '0000-00-00 00:00:00' AND `priority` < %d
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ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
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if (dbm::is_result($r))
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return $r;
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// Give slower processes some processing time
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$r = q("SELECT * FROM `workerqueue`
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WHERE `executed` = '0000-00-00 00:00:00' AND `priority` > %d
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ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
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}
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// If there is no result (or we shouldn't pass lower processes) we check without priority limit
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if (($highest_priority == 0) OR !dbm::is_result($r))
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$r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1");
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return $r;
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}
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if (array_search(__file__,get_included_files())===0){
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poller_run($_SERVER["argv"],$_SERVER["argc"]);
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get_app()->end_process();
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killme();
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}
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?>
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