2 if (!file_exists("boot.php") AND (sizeof($_SERVER["argv"]) != 0)) {
3 $directory = dirname($_SERVER["argv"][0]);
5 if (substr($directory, 0, 1) != "/")
6 $directory = $_SERVER["PWD"]."/".$directory;
8 $directory = realpath($directory."/..");
13 require_once("boot.php");
15 function poller_run(&$argv, &$argc){
23 @include(".htconfig.php");
24 require_once("include/dba.php");
25 $db = new dba($db_host, $db_user, $db_pass, $db_data);
26 unset($db_host, $db_user, $db_pass, $db_data);
29 if ($a->max_processes_reached())
32 if (poller_max_connections_reached())
35 if (App::maxload_reached())
38 // Checking the number of workers
39 if (poller_too_much_workers(1)) {
40 poller_kill_stale_workers();
44 if(($argc <= 1) OR ($argv[1] != "no_cron")) {
45 // Run the cron job that calls all other jobs
46 proc_run("php","include/cron.php");
48 // Run the cronhooks job separately from cron for being able to use a different timing
49 proc_run("php","include/cronhooks.php");
51 // Cleaning dead processes
52 poller_kill_stale_workers();
54 // Sleep four seconds before checking for running processes again to avoid having too many workers
57 // Checking number of workers
58 if (poller_too_much_workers(2))
63 while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
65 // Constantly check the number of parallel database processes
66 if ($a->max_processes_reached())
69 // Constantly check the number of available database connections to let the frontend be accessible at any time
70 if (poller_max_connections_reached())
73 // Count active workers and compare them with a maximum value that depends on the load
74 if (poller_too_much_workers(3))
77 q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
78 dbesc(datetime_convert()),
82 // Assure that there are no tasks executed twice
83 $id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
87 logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
91 $argv = json_decode($r[0]["parameter"]);
95 // Check for existance and validity of the include file
98 if (!validate_include($include)) {
99 logger("Include file ".$argv[0]." is not valid!");
100 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
104 require_once($include);
106 $funcname=str_replace(".php", "", basename($argv[0]))."_run";
108 if (function_exists($funcname)) {
109 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
110 $funcname($argv, $argc);
112 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
114 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
116 logger("Function ".$funcname." does not exist");
118 // Quit the poller once every hour
119 if (time() > ($starttime + 3600))
126 * @brief Checks if the number of database connections has reached a critical limit.
128 * @return bool Are more than 3/4 of the maximum connections used?
130 function poller_max_connections_reached() {
132 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
133 $max = get_config("system", "max_connections");
135 // Fetch the percentage level where the poller will get active
136 $maxlevel = get_config("system", "max_connections_level");
141 // the maximum number of possible user connections can be a system variable
142 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
144 $max = $r[0]["Value"];
146 // Or it can be granted. This overrides the system variable
147 $r = q("SHOW GRANTS");
149 foreach ($r AS $grants) {
150 $grant = array_pop($grants);
151 if (stristr($grant, "GRANT USAGE ON"))
152 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
157 // If $max is set we will use the processlist to determine the current number of connections
158 // The processlist only shows entries of the current user
160 $r = q("SHOW PROCESSLIST");
166 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
168 $level = ($used / $max) * 100;
170 if ($level >= $maxlevel) {
171 logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
176 // We will now check for the system values.
177 // This limit could be reached although the user limits are fine.
178 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
182 $max = intval($r[0]["Value"]);
186 $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
190 $used = intval($r[0]["Value"]);
194 logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
196 $level = $used / $max * 100;
198 if ($level < $maxlevel)
201 logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
206 * @brief fix the queue entry if the worker process died
209 function poller_kill_stale_workers() {
210 $r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
212 if (!dbm::is_result($r)) {
213 // No processing here needed
218 if (!posix_kill($pid["pid"], 0))
219 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
220 intval($pid["pid"]));
222 // Kill long running processes
223 $duration = (time() - strtotime($pid["executed"])) / 60;
224 if ($duration > 180) {
225 logger("Worker process ".$pid["pid"]." took more than 3 hours. It will be killed now.");
226 posix_kill($pid["pid"], SIGTERM);
228 // Question: If a process is stale: Should we remove it or should we reschedule it?
229 // By now we rescheduling it. It's maybe not the wisest decision?
230 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
231 intval($pid["pid"]));
233 logger("Worker process ".$pid["pid"]." now runs for ".round($duration)." minutes. That's okay.", LOGGER_DEBUG);
237 function poller_too_much_workers($stage) {
239 $queues = get_config("system", "worker_queues");
244 $active = poller_active_workers();
246 // Decrease the number of workers at higher load
247 $load = current_load();
249 $maxsysload = intval(get_config('system','maxloadavg'));
253 $maxworkers = $queues;
255 // Some magical mathemathics to reduce the workers
257 $slope = $maxworkers / pow($maxsysload, $exponent);
258 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
260 logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
264 return($active >= $queues);
267 function poller_active_workers() {
268 $workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
270 return($workers[0]["workers"]);
273 if (array_search(__file__,get_included_files())===0){
274 poller_run($_SERVER["argv"],$_SERVER["argc"]);