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 = poller_worker_process()) {
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 $upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
95 dbesc(datetime_convert()),
100 logger("Couldn't update queue entry ".$r[0]["id"]." - skip this execution", LOGGER_DEBUG);
104 // Assure that there are no tasks executed twice
105 $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
107 logger("Queue item ".$r[0]["id"]." vanished - skip this execution", LOGGER_DEBUG);
109 } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
110 logger("Entry for queue item ".$r[0]["id"]." wasn't stored - we better stop here", LOGGER_DEBUG);
112 } elseif ($id[0]["pid"] != $mypid) {
113 logger("Queue item ".$r[0]["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
117 $argv = json_decode($r[0]["parameter"]);
119 $argc = count($argv);
121 // Check for existance and validity of the include file
124 if (!validate_include($include)) {
125 logger("Include file ".$argv[0]." is not valid!");
126 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
130 require_once($include);
132 $funcname = str_replace(".php", "", basename($argv[0]))."_run";
134 if (function_exists($funcname)) {
135 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
137 // For better logging create a new process id for every worker call
138 // But preserve the old one for the worker
139 $old_process_id = $a->process_id;
140 $a->process_id = uniqid("wrk", true);
142 $funcname($argv, $argc);
144 $a->process_id = $old_process_id;
147 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
151 logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - done");
153 q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
155 logger("Function ".$funcname." does not exist");
157 // Quit the poller once every hour
158 if (time() > ($starttime + 3600))
165 * @brief Checks if the number of database connections has reached a critical limit.
167 * @return bool Are more than 3/4 of the maximum connections used?
169 function poller_max_connections_reached() {
171 // Fetch the max value from the config. This is needed when the system cannot detect the correct value by itself.
172 $max = get_config("system", "max_connections");
174 // Fetch the percentage level where the poller will get active
175 $maxlevel = get_config("system", "max_connections_level");
180 // the maximum number of possible user connections can be a system variable
181 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
183 $max = $r[0]["Value"];
185 // Or it can be granted. This overrides the system variable
186 $r = q("SHOW GRANTS");
188 foreach ($r AS $grants) {
189 $grant = array_pop($grants);
190 if (stristr($grant, "GRANT USAGE ON"))
191 if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match))
196 // If $max is set we will use the processlist to determine the current number of connections
197 // The processlist only shows entries of the current user
199 $r = q("SHOW PROCESSLIST");
205 logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
207 $level = ($used / $max) * 100;
209 if ($level >= $maxlevel) {
210 logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
215 // We will now check for the system values.
216 // This limit could be reached although the user limits are fine.
217 $r = q("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
221 $max = intval($r[0]["Value"]);
225 $r = q("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
229 $used = intval($r[0]["Value"]);
233 logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
235 $level = $used / $max * 100;
237 if ($level < $maxlevel)
240 logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
245 * @brief fix the queue entry if the worker process died
248 function poller_kill_stale_workers() {
249 $r = q("SELECT `pid`, `executed`, `priority`, `parameter` FROM `workerqueue` WHERE `executed` != '0000-00-00 00:00:00'");
251 if (!dbm::is_result($r)) {
252 // No processing here needed
257 if (!posix_kill($pid["pid"], 0))
258 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `pid` = 0 WHERE `pid` = %d",
259 intval($pid["pid"]));
261 // Kill long running processes
263 // Check if the priority is in a valid range
264 if (!in_array($pid["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE)))
265 $pid["priority"] = PRIORITY_MEDIUM;
267 // Define the maximum durations
268 $max_duration_defaults = array(PRIORITY_CRITICAL => 360, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 360);
269 $max_duration = $max_duration_defaults[$pid["priority"]];
271 $argv = json_decode($pid["parameter"]);
272 $argv[0] = basename($argv[0]);
274 // How long is the process already running?
275 $duration = (time() - strtotime($pid["executed"])) / 60;
276 if ($duration > $max_duration) {
277 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
278 posix_kill($pid["pid"], SIGTERM);
280 // We killed the stale process.
281 // To avoid a blocking situation we reschedule the process at the beginning of the queue.
282 // Additionally we are lowering the priority.
283 q("UPDATE `workerqueue` SET `executed` = '0000-00-00 00:00:00', `created` = '%s',
284 `priority` = %d, `pid` = 0 WHERE `pid` = %d",
285 dbesc(datetime_convert()),
286 intval(PRIORITY_NEGLIGIBLE),
287 intval($pid["pid"]));
289 logger("Worker process ".$pid["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
293 function poller_too_much_workers() {
296 $queues = get_config("system", "worker_queues");
301 $maxqueues = $queues;
303 $active = poller_active_workers();
305 // Decrease the number of workers at higher load
306 $load = current_load();
308 $maxsysload = intval(get_config('system','maxloadavg'));
312 $maxworkers = $queues;
314 // Some magical mathemathics to reduce the workers
316 $slope = $maxworkers / pow($maxsysload, $exponent);
317 $queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
319 $s = q("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00'");
320 $entries = $s[0]["total"];
322 if (Config::get("system", "worker_fastlane", false) AND ($queues > 0) AND ($entries > 0) AND ($active >= $queues)) {
323 $s = q("SELECT `priority` FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority` LIMIT 1");
324 $top_priority = $s[0]["priority"];
326 $s = q("SELECT `id` FROM `workerqueue` WHERE `priority` <= %d AND `executed` != '0000-00-00 00:00:00' LIMIT 1",
327 intval($top_priority));
328 $high_running = dbm::is_result($s);
330 if (!$high_running AND ($top_priority > PRIORITY_UNDEFINED) AND ($top_priority < PRIORITY_NEGLIGIBLE)) {
331 logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
332 $queues = $active + 1;
336 // Create a list of queue entries grouped by their priority
337 $running = array(PRIORITY_CRITICAL => 0,
339 PRIORITY_MEDIUM => 0,
341 PRIORITY_NEGLIGIBLE => 0);
343 $r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
344 if (dbm::is_result($r))
345 foreach ($r AS $process)
346 $running[$process["priority"]] = $process["running"];
349 $r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
350 if (dbm::is_result($r))
351 foreach ($r as $entry) {
352 if ($processlist != "")
353 $processlist .= ", ";
354 $processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
357 logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
359 // Are there fewer workers running as possible? Then fork a new one.
360 if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
361 logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
362 $args = array("php", "include/poller.php", "no_cron");
368 return($active >= $queues);
371 function poller_active_workers() {
372 $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
374 return($workers[0]["processes"]);
378 * @brief Check if we should pass some slow processes
380 * When the active processes of the highest priority are using more than 2/3
381 * of all processes, we let pass slower processes.
383 * @param string $highest_priority Returns the currently highest priority
384 * @return bool We let pass a slower process than $highest_priority
386 function poller_passing_slow(&$highest_priority) {
388 $highest_priority = 0;
390 $r = q("SELECT `priority`
392 INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`
393 WHERE `process`.`command` = 'poller.php'");
395 // No active processes at all? Fine
396 if (!dbm::is_result($r))
399 $priorities = array();
400 foreach ($r AS $line)
401 $priorities[] = $line["priority"];
404 if (count($priorities) == 0)
407 $highest_priority = min($priorities);
409 // The highest process is already the slowest one?
411 if ($highest_priority == PRIORITY_NEGLIGIBLE)
415 foreach ($priorities AS $priority)
416 if ($priority == $highest_priority)
419 logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
420 $passing_slow = (($high/count($priorities)) > (2/3));
423 logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
425 return($passing_slow);
429 * @brief Returns the next worker process
431 * @return string SQL statement
434 function poller_worker_process() {
436 // Check if we should pass some low priority process
437 $highest_priority = 0;
439 if (poller_passing_slow($highest_priority)) {
440 // Are there waiting processes with a higher priority than the currently highest?
441 $r = q("SELECT * FROM `workerqueue`
442 WHERE `executed` = '0000-00-00 00:00:00' AND `priority` < %d
443 ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
444 if (dbm::is_result($r))
447 // Give slower processes some processing time
448 $r = q("SELECT * FROM `workerqueue`
449 WHERE `executed` = '0000-00-00 00:00:00' AND `priority` > %d
450 ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
453 // If there is no result (or we shouldn't pass lower processes) we check without priority limit
454 if (($highest_priority == 0) OR !dbm::is_result($r))
455 $r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1");
460 if (array_search(__file__,get_included_files())===0){
461 poller_run($_SERVER["argv"],$_SERVER["argc"]);
463 get_app()->end_process();