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 (poller_max_connections_reached())
32 $load = current_load();
34 $maxsysload = intval(get_config('system','maxloadavg'));
38 if(intval($load) > $maxsysload) {
39 logger('system: load ' . $load . ' too high. poller deferred to next scheduled run.');
44 // Checking the number of workers
45 if (poller_too_much_workers(1)) {
46 poller_kill_stale_workers();
50 if(($argc <= 1) OR ($argv[1] != "no_cron")) {
51 // Run the cron job that calls all other jobs
52 proc_run("php","include/cron.php");
54 // Run the cronhooks job separately from cron for being able to use a different timing
55 proc_run("php","include/cronhooks.php");
57 // Cleaning dead processes
58 poller_kill_stale_workers();
60 // Sleep four seconds before checking for running processes again to avoid having too many workers
63 // Checking number of workers
64 if (poller_too_much_workers(2))
69 while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
71 // Constantly check the number of available database connections to let the frontend be accessible at any time
72 if (poller_max_connections_reached())
75 // Count active workers and compare them with a maximum value that depends on the load
76 if (poller_too_much_workers(3))
79 q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
80 dbesc(datetime_convert()),
84 // Assure that there are no tasks executed twice
85 $id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
89 logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
93 $argv = json_decode($r[0]["parameter"]);
97 // Check for existance and validity of the include file
100 if (!validate_include($include)) {
101 logger("Include file ".$argv[0]." is not valid!");
102 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
106 require_once($include);
108 $funcname=str_replace(".php", "", basename($argv[0]))."_run";
110 if (function_exists($funcname)) {
111 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
112 $funcname($argv, $argc);
114 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
116 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
118 logger("Function ".$funcname." does not exist");
120 // Quit the poller once every hour
121 if (time() > ($starttime + 3600))
128 * @brief Checks if the number of database connections has reached a critical limit.
130 * @return bool Are more than 3/4 of the maximum connections used?
132 function poller_max_connections_reached() {
134 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
135 $max = get_config("system", "max_connections");
138 // the maximum number of possible user connections can be a system variable
139 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
141 $max = $r[0]["Value"];
143 // Or it can be granted. This overrides the system variable
144 $r = q("SHOW GRANTS");
146 foreach ($r AS $grants) {
147 $grant = array_pop($grants);
148 if (stristr($grant, "GRANT USAGE ON"))
149 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
154 // If $max is set we will use the processlist to determine the current number of connections
155 // The processlist only shows entries of the current user
157 $r = q("SHOW PROCESSLIST");
163 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
165 $level = $used / $max;
167 if ($level >= (3/4)) {
168 logger("Maximum level (3/4) of user connections reached: ".$used."/".$max);
173 // We will now check for the system values.
174 // This limit could be reached although the user limits are fine.
175 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
179 $max = intval($r[0]["Value"]);
183 $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
187 $used = intval($r[0]["Value"]);
191 logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
193 $level = $used / $max;
198 logger("Maximum level (3/4) of system connections reached: ".$used."/".$max);
203 * @brief fix the queue entry if the worker process died
206 function poller_kill_stale_workers() {
207 $r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
209 if (!posix_kill($pid["pid"], 0))
210 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
211 intval($pid["pid"]));
213 // Kill long running processes
214 $duration = (time() - strtotime($pid["executed"])) / 60;
215 if ($duration > 180) {
216 logger("Worker process ".$pid["pid"]." took more than 3 hours. It will be killed now.");
217 posix_kill($pid["pid"], SIGTERM);
219 // Question: If a process is stale: Should we remove it or should we reschedule it?
220 // By now we rescheduling it. It's maybe not the wisest decision?
221 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
222 intval($pid["pid"]));
224 logger("Worker process ".$pid["pid"]." now runs for ".round($duration)." minutes. That's okay.", LOGGER_DEBUG);
228 function poller_too_much_workers($stage) {
230 $queues = get_config("system", "worker_queues");
235 $active = poller_active_workers();
237 // Decrease the number of workers at higher load
238 $load = current_load();
240 $maxsysload = intval(get_config('system','maxloadavg'));
244 $maxworkers = $queues;
246 // Some magical mathemathics to reduce the workers
248 $slope = $maxworkers / pow($maxsysload, $exponent);
249 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
251 logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
255 return($active >= $queues);
258 function poller_active_workers() {
259 $workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
261 return($workers[0]["workers"]);
264 if (array_search(__file__,get_included_files())===0){
265 poller_run($_SERVER["argv"],$_SERVER["argc"]);