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Backend/Frontend detection when checking for overload

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This commit is contained in:
Michael Vogel 2016-07-02 08:54:57 +02:00
parent 0344d26896
commit b3c8ff836d
2 changed files with 105 additions and 35 deletions
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45
index.php
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@ -19,6 +19,10 @@ require_once('object/BaseObject.php');
$a = new App;
BaseObject::set_app($a);
// We assume that the index.php is called by a frontend process
// The value is set to "true" by default in boot.php
$a->backend = false;
/**
*
* Load the configuration file which contains our DB credentials.
@ -54,36 +58,12 @@ if(!$install) {
load_config('config');
load_config('system');
$processlist = dbm::processlist();
if ($processlist["list"] != "") {
logger("Processcheck: Processes: ".$processlist["amount"]." - Processlist: ".$processlist["list"], LOGGER_DEBUG);
$max_processes = get_config('system', 'max_processes_frontend');
if (intval($max_processes) == 0)
$max_processes = 20;
if ($processlist["amount"] > $max_processes) {
logger("Processcheck: Maximum number of processes for frontend tasks (".$max_processes.") reached.", LOGGER_DEBUG);
system_unavailable();
}
if ($a->max_processes_reached() OR $a->maxload_reached()) {
header($_SERVER["SERVER_PROTOCOL"].' 503 Service Temporarily Unavailable');
header('Retry-After: 300');
die("System is currently unavailable. Please try again later");
}
$maxsysload_frontend = intval(get_config('system','maxloadavg_frontend'));
if($maxsysload_frontend < 1)
$maxsysload_frontend = 50;
$load = current_load();
if($load) {
if($load > $maxsysload_frontend) {
logger('system: load ' . $load . ' too high. Service Temporarily Unavailable.');
header($_SERVER["SERVER_PROTOCOL"].' 503 Service Temporarily Unavailable');
header('Retry-After: 300');
die("System is currently unavailable. Please try again later");
}
}
if (get_config('system','force_ssl') AND ($a->get_scheme() == "http") AND
(intval(get_config('system','ssl_policy')) == SSL_POLICY_FULL) AND
(substr($a->get_baseurl(), 0, 8) == "https://")) {
@ -114,9 +94,12 @@ load_translation_table($lang);
*
*/
$stamp1 = microtime(true);
session_start();
$a->save_timestamp($stamp1, "parser");
// Exclude the backend processes from the session management
if (!$a->is_backend()) {
$stamp1 = microtime(true);
session_start();
$a->save_timestamp($stamp1, "parser");
}
/**
* Language was set earlier, but we can over-ride it in the session.