require_once("boot.php");
-function poller_run(&$argv, &$argc){
+function poller_run($argv, $argc){
global $a, $db;
if(is_null($a)) {
$a->start_process();
- $mypid = getmypid();
-
- if ($a->max_processes_reached())
+ if (poller_max_connections_reached()) {
return;
+ }
- if (poller_max_connections_reached())
+ if ($a->maxload_reached()) {
return;
+ }
- if (App::maxload_reached())
+ if(($argc <= 1) OR ($argv[1] != "no_cron")) {
+ poller_run_cron();
+ }
+
+ if ($a->max_processes_reached()) {
return;
+ }
// Checking the number of workers
if (poller_too_much_workers()) {
return;
}
- if(($argc <= 1) OR ($argv[1] != "no_cron")) {
- // Run the cron job that calls all other jobs
- proc_run(PRIORITY_MEDIUM, "include/cron.php");
+ $starttime = time();
- // Run the cronhooks job separately from cron for being able to use a different timing
- proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
+ while ($r = poller_worker_process()) {
- // Cleaning dead processes
- poller_kill_stale_workers();
- } else
- // Sleep four seconds before checking for running processes again to avoid having too many workers
- sleep(4);
+ // Count active workers and compare them with a maximum value that depends on the load
+ if (poller_too_much_workers()) {
+ return;
+ }
- // Checking number of workers
- if (poller_too_much_workers())
- return;
+ if (!poller_execute($r[0])) {
+ return;
+ }
- $cooldown = Config::get("system", "worker_cooldown", 0);
+ // Quit the poller once every hour
+ if (time() > ($starttime + 3600))
+ return;
+ }
- $starttime = time();
+}
- while ($r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1")) {
+/**
+ * @brief Execute a worker entry
+ *
+ * @param array $queue Workerqueue entry
+ *
+ * @return boolean "true" if further processing should be stopped
+ */
+function poller_execute($queue) {
- // Quit when in maintenance
- if (get_config('system', 'maintenance', true))
- return;
+ $a = get_app();
- // Constantly check the number of parallel database processes
- if ($a->max_processes_reached())
- return;
+ $mypid = getmypid();
- // Constantly check the number of available database connections to let the frontend be accessible at any time
- if (poller_max_connections_reached())
- return;
+ $cooldown = Config::get("system", "worker_cooldown", 0);
- // Count active workers and compare them with a maximum value that depends on the load
- if (poller_too_much_workers())
- return;
+ // Quit when in maintenance
+ if (get_config('system', 'maintenance', true)) {
+ return false;
+ }
- q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `executed` = '0000-00-00 00:00:00'",
- dbesc(datetime_convert()),
- intval($mypid),
- intval($r[0]["id"]));
-
- // Assure that there are no tasks executed twice
- $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
- if (!$id) {
- logger("Queue item ".$r[0]["id"]." vanished - skip this execution", LOGGER_DEBUG);
- continue;
- } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
- logger("Entry for queue item ".$r[0]["id"]." wasn't stored - we better stop here", LOGGER_DEBUG);
- return;
- } elseif ($id[0]["pid"] != $mypid) {
- logger("Queue item ".$r[0]["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
- continue;
- }
+ // Constantly check the number of parallel database processes
+ if ($a->max_processes_reached()) {
+ return false;
+ }
+
+ // Constantly check the number of available database connections to let the frontend be accessible at any time
+ if (poller_max_connections_reached()) {
+ return false;
+ }
- $argv = json_decode($r[0]["parameter"]);
+ $upd = q("UPDATE `workerqueue` SET `executed` = '%s', `pid` = %d WHERE `id` = %d AND `pid` = 0",
+ dbesc(datetime_convert()),
+ intval($mypid),
+ intval($queue["id"]));
- $argc = count($argv);
+ if (!$upd) {
+ logger("Couldn't update queue entry ".$queue["id"]." - skip this execution", LOGGER_DEBUG);
+ q("COMMIT");
+ return true;
+ }
- // Check for existance and validity of the include file
- $include = $argv[0];
+ // Assure that there are no tasks executed twice
+ $id = q("SELECT `pid`, `executed` FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
+ if (!$id) {
+ logger("Queue item ".$queue["id"]." vanished - skip this execution", LOGGER_DEBUG);
+ q("COMMIT");
+ return true;
+ } elseif ((strtotime($id[0]["executed"]) <= 0) OR ($id[0]["pid"] == 0)) {
+ logger("Entry for queue item ".$queue["id"]." wasn't stored - skip this execution", LOGGER_DEBUG);
+ q("COMMIT");
+ return true;
+ } elseif ($id[0]["pid"] != $mypid) {
+ logger("Queue item ".$queue["id"]." is to be executed by process ".$id[0]["pid"]." and not by me (".$mypid.") - skip this execution", LOGGER_DEBUG);
+ q("COMMIT");
+ return true;
+ }
+ q("COMMIT");
- if (!validate_include($include)) {
- logger("Include file ".$argv[0]." is not valid!");
- q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
- continue;
- }
+ $argv = json_decode($queue["parameter"]);
- require_once($include);
+ $argc = count($argv);
- $funcname = str_replace(".php", "", basename($argv[0]))."_run";
+ // Check for existance and validity of the include file
+ $include = $argv[0];
- if (function_exists($funcname)) {
- logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." ".$r[0]["parameter"]);
+ if (!validate_include($include)) {
+ logger("Include file ".$argv[0]." is not valid!");
+ q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
+ return true;
+ }
- // For better logging create a new process id for every worker call
- // But preserve the old one for the worker
- $old_process_id = $a->process_id;
- $a->process_id = uniqid("wrk", true);
+ require_once($include);
- $funcname($argv, $argc);
+ $funcname = str_replace(".php", "", basename($argv[0]))."_run";
- $a->process_id = $old_process_id;
+ if (function_exists($funcname)) {
+ logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]);
- if ($cooldown > 0) {
- logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
- sleep($cooldown);
- }
+ // For better logging create a new process id for every worker call
+ // But preserve the old one for the worker
+ $old_process_id = $a->process_id;
+ $a->process_id = uniqid("wrk", true);
- logger("Process ".$mypid." - Prio ".$r[0]["priority"]." - ID ".$r[0]["id"].": ".$funcname." - done");
+ $funcname($argv, $argc);
- q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($r[0]["id"]));
- } else
- logger("Function ".$funcname." does not exist");
+ $a->process_id = $old_process_id;
- // Quit the poller once every hour
- if (time() > ($starttime + 3600))
- return;
+ if ($cooldown > 0) {
+ logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
+ sleep($cooldown);
+ }
+
+ logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done");
+
+ q("DELETE FROM `workerqueue` WHERE `id` = %d", intval($queue["id"]));
+ } else {
+ logger("Function ".$funcname." does not exist");
}
+ return true;
}
/**
$max = get_config("system", "max_connections");
// Fetch the percentage level where the poller will get active
- $maxlevel = get_config("system", "max_connections_level");
- if ($maxlevel == 0)
- $maxlevel = 75;
+ $maxlevel = Config::get("system", "max_connections_level", 75);
if ($max == 0) {
// the maximum number of possible user connections can be a system variable
// The processlist only shows entries of the current user
if ($max != 0) {
$r = q("SHOW PROCESSLIST");
- if (!$r)
+ if (!dbm::is_result($r))
return false;
$used = count($r);
}
}
+/**
+ * @brief Checks if the number of active workers exceeds the given limits
+ *
+ * @return bool Are there too much workers running?
+ */
function poller_too_much_workers() {
-
-
- $queues = get_config("system", "worker_queues");
-
- if ($queues == 0)
- $queues = 4;
+ $queues = Config::get("system", "worker_queues", 4);
$maxqueues = $queues;
// Decrease the number of workers at higher load
$load = current_load();
if($load) {
- $maxsysload = intval(get_config('system','maxloadavg'));
- if($maxsysload < 1)
- $maxsysload = 50;
+ $maxsysload = intval(Config::get("system", "maxloadavg", 50));
$maxworkers = $queues;
}
}
- logger("Current load: ".$load." - maximum: ".$maxsysload." - current queues: ".$active."/".$entries." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+ // Create a list of queue entries grouped by their priority
+ $running = array(PRIORITY_CRITICAL => 0,
+ PRIORITY_HIGH => 0,
+ PRIORITY_MEDIUM => 0,
+ PRIORITY_LOW => 0,
+ PRIORITY_NEGLIGIBLE => 0);
+
+ $r = q("SELECT COUNT(*) AS `running`, `priority` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` GROUP BY `priority`");
+ if (dbm::is_result($r))
+ foreach ($r AS $process)
+ $running[$process["priority"]] = $process["running"];
+
+ $processlist = "";
+ $r = q("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` GROUP BY `priority`");
+ if (dbm::is_result($r))
+ foreach ($r as $entry) {
+ if ($processlist != "")
+ $processlist .= ", ";
+ $processlist .= $entry["priority"].":".$running[$entry["priority"]]."/".$entry["entries"];
+ }
+
+ logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries." (".$processlist.") - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
// Are there fewer workers running as possible? Then fork a new one.
if (!get_config("system", "worker_dont_fork") AND ($queues > ($active + 1)) AND ($entries > 1)) {
return($active >= $queues);
}
+/**
+ * @brief Returns the number of active poller processes
+ *
+ * @return integer Number of active poller processes
+ */
function poller_active_workers() {
$workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'poller.php'");
return($workers[0]["processes"]);
}
+/**
+ * @brief Check if we should pass some slow processes
+ *
+ * When the active processes of the highest priority are using more than 2/3
+ * of all processes, we let pass slower processes.
+ *
+ * @param string $highest_priority Returns the currently highest priority
+ * @return bool We let pass a slower process than $highest_priority
+ */
+function poller_passing_slow(&$highest_priority) {
+
+ $highest_priority = 0;
+
+ $r = q("SELECT `priority`
+ FROM `process`
+ INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid`");
+
+ // No active processes at all? Fine
+ if (!dbm::is_result($r))
+ return(false);
+
+ $priorities = array();
+ foreach ($r AS $line)
+ $priorities[] = $line["priority"];
+
+ // Should not happen
+ if (count($priorities) == 0)
+ return(false);
+
+ $highest_priority = min($priorities);
+
+ // The highest process is already the slowest one?
+ // Then we quit
+ if ($highest_priority == PRIORITY_NEGLIGIBLE)
+ return(false);
+
+ $high = 0;
+ foreach ($priorities AS $priority)
+ if ($priority == $highest_priority)
+ ++$high;
+
+ logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
+ $passing_slow = (($high/count($priorities)) > (2/3));
+
+ if ($passing_slow)
+ logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
+
+ return($passing_slow);
+}
+
+/**
+ * @brief Returns the next worker process
+ *
+ * @return string SQL statement
+ */
+function poller_worker_process() {
+
+ q("START TRANSACTION;");
+
+ // Check if we should pass some low priority process
+ $highest_priority = 0;
+
+ if (poller_passing_slow($highest_priority)) {
+ // Are there waiting processes with a higher priority than the currently highest?
+ $r = q("SELECT * FROM `workerqueue`
+ WHERE `executed` = '0000-00-00 00:00:00' AND `priority` < %d
+ ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
+ if (dbm::is_result($r))
+ return $r;
+
+ // Give slower processes some processing time
+ $r = q("SELECT * FROM `workerqueue`
+ WHERE `executed` = '0000-00-00 00:00:00' AND `priority` > %d
+ ORDER BY `priority`, `created` LIMIT 1", dbesc($highest_priority));
+ }
+
+ // If there is no result (or we shouldn't pass lower processes) we check without priority limit
+ if (($highest_priority == 0) OR !dbm::is_result($r))
+ $r = q("SELECT * FROM `workerqueue` WHERE `executed` = '0000-00-00 00:00:00' ORDER BY `priority`, `created` LIMIT 1");
+
+ return $r;
+}
+
+/**
+ * @brief Call the front end worker
+ */
+function call_worker() {
+ if (!Config::get("system", "frontend_worker") OR !Config::get("system", "worker")) {
+ return;
+ }
+
+ $url = get_app()->get_baseurl()."/worker";
+ fetch_url($url, false, $redirects, 1);
+}
+
+/**
+ * @brief Call the front end worker if there aren't any active
+ */
+function call_worker_if_idle() {
+ if (!Config::get("system", "frontend_worker") OR !Config::get("system", "worker")) {
+ return;
+ }
+
+ // Do we have "proc_open"? Then we can fork the poller
+ if (function_exists("proc_open")) {
+ // When was the last time that we called the worker?
+ // Less than one minute? Then we quit
+ if ((time() - get_config("system", "worker_started")) < 60) {
+ return;
+ }
+
+ set_config("system", "worker_started", time());
+
+ // Do we have enough running workers? Then we quit here.
+ if (poller_too_much_workers()) {
+ // Cleaning dead processes
+ poller_kill_stale_workers();
+ get_app()->remove_inactive_processes();
+
+ return;
+ }
+
+ poller_run_cron();
+
+ logger('Call poller', LOGGER_DEBUG);
+
+ $args = array("php", "include/poller.php", "no_cron");
+ $a = get_app();
+ $a->proc_run($args);
+ return;
+ }
+
+ // We cannot execute background processes.
+ // We now run the processes from the frontend.
+ // This won't work with long running processes.
+ poller_run_cron();
+
+ clear_worker_processes();
+
+ $workers = q("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
+
+ if ($workers[0]["processes"] == 0) {
+ call_worker();
+ }
+}
+
+/**
+ * @brief Removes long running worker processes
+ */
+function clear_worker_processes() {
+ $timeout = Config::get("system", "frontend_worker_timeout", 10);
+
+ /// @todo We should clean up the corresponding workerqueue entries as well
+ q("DELETE FROM `process` WHERE `created` < '%s' AND `command` = 'worker.php'",
+ dbesc(datetime_convert('UTC','UTC',"now - ".$timeout." minutes")));
+}
+
+/**
+ * @brief Runs the cron processes
+ */
+function poller_run_cron() {
+ logger('Add cron entries', LOGGER_DEBUG);
+
+ // Check for spooled items
+ proc_run(PRIORITY_HIGH, "include/spool_post.php");
+
+ // Run the cron job that calls all other jobs
+ proc_run(PRIORITY_MEDIUM, "include/cron.php");
+
+ // Run the cronhooks job separately from cron for being able to use a different timing
+ proc_run(PRIORITY_MEDIUM, "include/cronhooks.php");
+
+ // Cleaning dead processes
+ poller_kill_stale_workers();
+}
+
if (array_search(__file__,get_included_files())===0){
poller_run($_SERVER["argv"],$_SERVER["argc"]);