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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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89
boot.php
View file

@ -475,6 +475,7 @@ class App {
public $performance = array();
public $callstack = array();
public $theme_info = array();
public $backend = true;
public $nav_sel;
@ -1111,6 +1112,80 @@ class App {
return($this->is_friendica_app);
}
/**
* @brief Checks if the site is called via a backend process
*
* This isn't a perfect solution. But we need this check very early.
* So we cannot wait until the modules are loaded.
*
* @return bool Is it a known backend?
*/
function is_backend() {
$backend = array();
$backend[] = "_well_known";
$backend[] = "api";
$backend[] = "dfrn_notify";
$backend[] = "dfrn_poll";
$backend[] = "fetch";
$backend[] = "hcard";
$backend[] = "hostxrd";
$backend[] = "nodeinfo";
$backend[] = "noscrape";
$backend[] = "p";
$backend[] = "photo";
$backend[] = "photos";
$backend[] = "poco";
$backend[] = "post";
$backend[] = "proxy";
$backend[] = "pubsub";
$backend[] = "pubsubhubbub";
$backend[] = "receive";
$backend[] = "rsd_xml";
$backend[] = "salmon";
$backend[] = "statistics_json";
$backend[] = "xrd";
if (in_array($this->module, $backend))
return(true);
else
return($this->backend);
}
/**
* @brief Checks if the maximum number of database processes is reached
*
* @return bool Is the limit reached?
*/
function max_processes_reached() {
// Is the function called statically?
if (!is_object($this))
return(self::$a->max_processes_reached());
if ($this->is_backend()) {
$process = "backend";
$max_processes = get_config('system', 'max_processes_backend');
if (intval($max_processes) == 0)
$max_processes = 5;
} else {
$process = "frontend";
$max_processes = get_config('system', 'max_processes_frontend');
if (intval($max_processes) == 0)
$max_processes = 20;
}
$processlist = dbm::processlist();
if ($processlist["list"] != "") {
logger("Processcheck: Processes: ".$processlist["amount"]." - Processlist: ".$processlist["list"], LOGGER_DEBUG);
if ($processlist["amount"] > $max_processes) {
logger("Processcheck: Maximum number of processes for ".$process." tasks (".$max_processes.") reached.", LOGGER_DEBUG);
return true;
}
}
return false;
}
/**
* @brief Checks if the maximum load is reached
*
@ -1118,14 +1193,26 @@ class App {
*/
function maxload_reached() {
// Is the function called statically?
if (!is_object($this))
return(self::$a->maxload_reached());
if ($this->is_backend()) {
$process = "backend";
$maxsysload = intval(get_config('system', 'maxloadavg'));
if ($maxsysload < 1)
$maxsysload = 50;
} else {
$process = "frontend";
$maxsysload = intval(get_config('system','maxloadavg_frontend'));
if ($maxsysload < 1)
$maxsysload = 50;
}
$load = current_load();
if ($load) {
if (intval($load) > $maxsysload) {
logger('system: load '.$load.' too high.');
logger('system: load '.$load.' for '.$process.' tasks ('.$maxsysload.') too high.');
return true;
}
}

33
index.php
View file

@ -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
$a->backend = false;
/**
*
* Load the configuration file which contains our DB credentials.
@ -54,35 +58,11 @@ if(!$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();
}
}
$maxsysload_frontend = intval(get_config('system','maxloadavg_frontend'));
if($maxsysload_frontend < 1)
$maxsysload_frontend = 50;
$load = current_load();
if($load) {
if($load > $maxsysload_frontend) {
logger('system: load ' . $load . ' too high. Service Temporarily Unavailable.');
if ($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");
}
}
if (get_config('system','force_ssl') AND ($a->get_scheme() == "http") AND
(intval(get_config('system','ssl_policy')) == SSL_POLICY_FULL) AND
@ -114,9 +94,12 @@ load_translation_table($lang);
*
*/
// 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.