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 use \Friendica\Core\Config;
14 use \Friendica\Core\PConfig;
16 require_once("boot.php");
18 function poller_run(&$argv, &$argc){
26 @include(".htconfig.php");
27 require_once("include/dba.php");
28 $db = new dba($db_host, $db_user, $db_pass, $db_data);
29 unset($db_host, $db_user, $db_pass, $db_data);
32 // Quit when in maintenance
33 if (get_config('system', 'maintenance', true))
40 if ($a->max_processes_reached())
43 if (poller_max_connections_reached())
46 if (App::maxload_reached())
49 // Checking the number of workers
50 if (poller_too_much_workers()) {
51 poller_kill_stale_workers();
55 if(($argc <= 1) OR ($argv[1] != "no_cron")) {
56 // Run the cron job that calls all other jobs
57 proc_run(PRIORITY_MEDIUM, "include/cron.php");
59 // Run the cronhooks job separately from cron for being able to use a different timing
60 proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
62 // Cleaning dead processes
63 poller_kill_stale_workers();
65 // Sleep four seconds before checking for running processes again to avoid having too many workers
68 // Checking number of workers
69 if (poller_too_much_workers())
72 $cooldown = Config::get("system", "worker_cooldown", 0);
76 while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1")) {
78 // Quit when in maintenance
79 if (get_config('system', 'maintenance', true))
82 // Constantly check the number of parallel database processes
83 if ($a->max_processes_reached())
86 // Constantly check the number of available database connections to let the frontend be accessible at any time
87 if (poller_max_connections_reached())
90 // Count active workers and compare them with a maximum value that depends on the load
91 if (poller_too_much_workers())
94 q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
95 dbesc(datetime_convert()),
99 // Assure that there are no tasks executed twice
100 $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
102 logger("Queue item ".$r[0]["id"]." vanished - skip this execution", LOGGER_DEBUG);
104 } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
105 logger("Entry for queue item ".$r[0]["id"]." wasn't stored - we better stop here", LOGGER_DEBUG);
107 } elseif ($id[0]["pid"] != $mypid) {
108 logger("Queue item ".$r[0]["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
112 $argv = json_decode($r[0]["parameter"]);
114 $argc = count($argv);
116 // Check for existance and validity of the include file
119 if (!validate_include($include)) {
120 logger("Include file ".$argv[0]." is not valid!");
121 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
125 require_once($include);
127 $funcname = str_replace(".php", "", basename($argv[0]))."_run";
129 if (function_exists($funcname)) {
130 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
131 $funcname($argv, $argc);
134 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
138 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - done");
140 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
142 logger("Function ".$funcname." does not exist");
144 // Quit the poller once every hour
145 if (time() > ($starttime + 3600))
152 * @brief Checks if the number of database connections has reached a critical limit.
154 * @return bool Are more than 3/4 of the maximum connections used?
156 function poller_max_connections_reached() {
158 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
159 $max = get_config("system", "max_connections");
161 // Fetch the percentage level where the poller will get active
162 $maxlevel = get_config("system", "max_connections_level");
167 // the maximum number of possible user connections can be a system variable
168 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
170 $max = $r[0]["Value"];
172 // Or it can be granted. This overrides the system variable
173 $r = q("SHOW GRANTS");
175 foreach ($r AS $grants) {
176 $grant = array_pop($grants);
177 if (stristr($grant, "GRANT USAGE ON"))
178 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
183 // If $max is set we will use the processlist to determine the current number of connections
184 // The processlist only shows entries of the current user
186 $r = q("SHOW PROCESSLIST");
192 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
194 $level = ($used / $max) * 100;
196 if ($level >= $maxlevel) {
197 logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
202 // We will now check for the system values.
203 // This limit could be reached although the user limits are fine.
204 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
208 $max = intval($r[0]["Value"]);
212 $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
216 $used = intval($r[0]["Value"]);
220 logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
222 $level = $used / $max * 100;
224 if ($level < $maxlevel)
227 logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
232 * @brief fix the queue entry if the worker process died
235 function poller_kill_stale_workers() {
236 $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
238 if (!dbm::is_result($r)) {
239 // No processing here needed
244 if (!posix_kill($pid["pid"], 0))
245 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
246 intval($pid["pid"]));
248 // Kill long running processes
250 // Check if the priority is in a valid range
251 if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
252 $pid["priority"] = PRIORITY_MEDIUM;
254 // Define the maximum durations
255 $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
256 $max_duration = $max_duration_defaults[$pid["priority"]];
258 $argv = json_decode($pid["parameter"]);
259 $argv[0] = basename($argv[0]);
261 // How long is the process already running?
262 $duration = (time() - strtotime($pid["executed"])) / 60;
263 if ($duration > $max_duration) {
264 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
265 posix_kill($pid["pid"], SIGTERM);
267 // We killed the stale process.
268 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
269 // Additionally we are lowering the priority.
270 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `created` = '%s',
271 `priority` = %d, `pid` = 0 WHERE `pid` = %d",
272 dbesc(datetime_convert()),
273 intval(PRIORITY_NEGLIGIBLE),
274 intval($pid["pid"]));
276 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
280 function poller_too_much_workers() {
283 $queues = get_config("system", "worker_queues");
288 $maxqueues = $queues;
290 $active = poller_active_workers();
292 // Decrease the number of workers at higher load
293 $load = current_load();
295 $maxsysload = intval(get_config('system','maxloadavg'));
299 $maxworkers = $queues;
301 // Some magical mathemathics to reduce the workers
303 $slope = $maxworkers / pow($maxsysload, $exponent);
304 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
306 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
307 $entries = $s[0]["total"];
309 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
310 $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
311 $top_priority = $s[0]["priority"];
313 $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00' LIMIT 1",
314 intval($top_priority));
315 $high_running = dbm::is_result($s);
317 if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
318 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
319 $queues = $active + 1;
323 logger("Current load: ".$load." - maximum: ".$maxsysload." - current queues: ".$active."/".$entries." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
325 // Are there fewer workers running as possible? Then fork a new one.
326 if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
327 logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
328 $args = array("php", "include/poller.php", "no_cron");
334 return($active >= $queues);
337 function poller_active_workers() {
338 $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
340 return($workers[0]["processes"]);
343 if (array_search(__file__,get_included_files())===0){
344 poller_run($_SERVER["argv"],$_SERVER["argc"]);
346 get_app()->end_process();