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");
14 require_once("dbm.php");
16 function poller_run(&$argv, &$argc){
24 @include(".htconfig.php");
25 require_once("include/dba.php");
26 $db = new dba($db_host, $db_user, $db_pass, $db_data);
27 unset($db_host, $db_user, $db_pass, $db_data);
30 $max_processes = get_config('system', 'max_processes_backend');
31 if (intval($max_processes) == 0)
34 $processlist = dbm::processlist();
35 if ($processlist["list"] != "") {
36 logger("Processcheck: Processes: ".$processlist["amount"]." - Processlist: ".$processlist["list"], LOGGER_DEBUG);
38 if ($processlist["amount"] > $max_processes) {
39 logger("Processcheck: Maximum number of processes for backend tasks (".$max_processes.") reached.", LOGGER_DEBUG);
44 if (poller_max_connections_reached())
47 if (App::maxload_reached())
50 // Checking the number of workers
51 if (poller_too_much_workers(1)) {
52 poller_kill_stale_workers();
56 if(($argc <= 1) OR ($argv[1] != "no_cron")) {
57 // Run the cron job that calls all other jobs
58 proc_run("php","include/cron.php");
60 // Run the cronhooks job separately from cron for being able to use a different timing
61 proc_run("php","include/cronhooks.php");
63 // Cleaning dead processes
64 poller_kill_stale_workers();
66 // Sleep four seconds before checking for running processes again to avoid having too many workers
69 // Checking number of workers
70 if (poller_too_much_workers(2))
75 while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `created` LIMIT 1")) {
77 // Log the type of database processes
78 $processlist = dbm::processlist();
79 if ($processlist["amount"] != "") {
80 logger("Processcheck: Processes: ".$processlist["amount"]." - Processlist: ".$processlist["list"], LOGGER_DEBUG);
82 if ($processlist["amount"] > $max_processes) {
83 logger("Processcheck: Maximum number of processes for backend tasks (".$max_processes.") reached.", LOGGER_DEBUG);
88 // Constantly check the number of available database connections to let the frontend be accessible at any time
89 if (poller_max_connections_reached())
92 // Count active workers and compare them with a maximum value that depends on the load
93 if (poller_too_much_workers(3))
96 q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
97 dbesc(datetime_convert()),
101 // Assure that there are no tasks executed twice
102 $id = q("SELECT `id` FROM `workerqueue` WHERE `id` = %d AND `pid` = %d",
106 logger("Queue item ".$r[0]["id"]." was executed multiple times - skip this execution", LOGGER_DEBUG);
110 $argv = json_decode($r[0]["parameter"]);
112 $argc = count($argv);
114 // Check for existance and validity of the include file
117 if (!validate_include($include)) {
118 logger("Include file ".$argv[0]." is not valid!");
119 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
123 require_once($include);
125 $funcname=str_replace(".php", "", basename($argv[0]))."_run";
127 if (function_exists($funcname)) {
128 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
129 $funcname($argv, $argc);
131 logger("Process ".getmypid()." - ID ".$r[0]["id"].": ".$funcname." - done");
133 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
135 logger("Function ".$funcname." does not exist");
137 // Quit the poller once every hour
138 if (time() > ($starttime + 3600))
145 * @brief Checks if the number of database connections has reached a critical limit.
147 * @return bool Are more than 3/4 of the maximum connections used?
149 function poller_max_connections_reached() {
151 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
152 $max = get_config("system", "max_connections");
154 // Fetch the percentage level where the poller will get active
155 $maxlevel = get_config("system", "max_connections_level");
160 // the maximum number of possible user connections can be a system variable
161 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
163 $max = $r[0]["Value"];
165 // Or it can be granted. This overrides the system variable
166 $r = q("SHOW GRANTS");
168 foreach ($r AS $grants) {
169 $grant = array_pop($grants);
170 if (stristr($grant, "GRANT USAGE ON"))
171 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
176 // If $max is set we will use the processlist to determine the current number of connections
177 // The processlist only shows entries of the current user
179 $r = q("SHOW PROCESSLIST");
185 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
187 $level = ($used / $max) * 100;
189 if ($level >= $maxlevel) {
190 logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
195 // We will now check for the system values.
196 // This limit could be reached although the user limits are fine.
197 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
201 $max = intval($r[0]["Value"]);
205 $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
209 $used = intval($r[0]["Value"]);
213 logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
215 $level = $used / $max * 100;
217 if ($level < $maxlevel)
220 logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
225 * @brief fix the queue entry if the worker process died
228 function poller_kill_stale_workers() {
229 $r = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
231 if (!dbm::is_result($r)) {
232 // No processing here needed
237 if (!posix_kill($pid["pid"], 0))
238 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
239 intval($pid["pid"]));
241 // Kill long running processes
242 $duration = (time() - strtotime($pid["executed"])) / 60;
243 if ($duration > 180) {
244 logger("Worker process ".$pid["pid"]." took more than 3 hours. It will be killed now.");
245 posix_kill($pid["pid"], SIGTERM);
247 // Question: If a process is stale: Should we remove it or should we reschedule it?
248 // By now we rescheduling it. It's maybe not the wisest decision?
249 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
250 intval($pid["pid"]));
252 logger("Worker process ".$pid["pid"]." now runs for ".round($duration)." minutes. That's okay.", LOGGER_DEBUG);
256 function poller_too_much_workers($stage) {
258 $queues = get_config("system", "worker_queues");
263 $active = poller_active_workers();
265 // Decrease the number of workers at higher load
266 $load = current_load();
268 $maxsysload = intval(get_config('system','maxloadavg'));
272 $maxworkers = $queues;
274 // Some magical mathemathics to reduce the workers
276 $slope = $maxworkers / pow($maxsysload, $exponent);
277 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
279 logger("Current load stage ".$stage.": ".$load." - maximum: ".$maxsysload." - current queues: ".$active." - maximum: ".$queues, LOGGER_DEBUG);
283 return($active >= $queues);
286 function poller_active_workers() {
287 $workers = q("SELECT COUNT(*) AS `workers` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
289 return($workers[0]["workers"]);
292 if (array_search(__file__,get_included_files())===0){
293 poller_run($_SERVER["argv"],$_SERVER["argc"]);