Bir Web Sunucusu Kodlama Denemesi – 4 : Azra Web Server

İki günlük bir aradan sonra serinin yeni bölümüyle(!) karşınızdayım.
Bu yazının ana konusu pcntl destekli, daemon olarak çalışan Azra Web Server. Değişiklik olsun diye önce benchmarklara bakalım. Aşağıdaki tabloda açıkça görülebildiği gibi Azra ağır yük altında bile Apache’den çok iyi, Nginx’ten biraz daha iyi.

X Ortalama (ms) real user sys
Apache 0.00938119351864 0m2.247s 0m0.068s 0m0.028s
Nginx 0,00461062550545 0m4.443s 0m0.152s 0m0.036s
Azra 0,00429985105991 0m1.992s 0m0.112s 0m0.024s

Benchmark yöntemi:
Apache, Nginx ve Azra kullanarak aşağıdaki kodu 400 kere çağırıyoruz.
test.php:

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<?php

$start = microtime(1);

for($n = 0; $n <= 10000; $n++)
{
    echo $n;
}
$end = microtime(1);
$elapsed = $end - $start;
echo "<br/>vakit(ms): $elapsed";
$fileHandle = fopen('serverBenchmark.txt' , 'a');
fputs($fileHandle , $elapsed . "\n");
fclose($fileHandle);

ve test için kullandığımız python kodu (benchmark.py):

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import urllib2
from threading import Thread

class testSuite:
    def testConnection(self , url , thread = 0):
        page = urllib2.urlopen(url)
        data = page.read()
        page.close()
        print("Thread:%d" % thread)
           
    def simpleConnection(self , url , tourNum):
        for i in range(tourNum):
            self.testConnection(url)
       
    def threadedConnection(self , url , tourNum , threadNum):
        for i in range(tourNum):
            myThread = i % threadNum
            t = Thread(target=self.testConnection , args=(url , myThread))
            t.start()

myTestSuite = testSuite()

myTestSuite.threadedConnection('http://localhost:8114/test.php' , 400 , 10) #azra
#myTestSuite.threadedConnection('http://localhost/webserver/test.php' , 400 , 10) #apache
#myTestSuite.threadedConnection('http://localhost/test.php' , 400 , 10) #nginx

Gelişmeler:
Artık Azra, Ubuntu altında daemon olarak çalışabiliyor.
/etc/init.d/azra

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#! /bin/sh
### BEGIN INIT INFO
# Provides:          azra
# Required-Start:    $all
# Required-Stop:     $all
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start and stop azra web server
# Description:       Start and stop azra web server
### END INIT INFO

# Author: Can Ince <[EMAIL PROTECTED]>

# Do NOT "set -e"

PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="AZRA WEB SERVER"
NAME=Azra
DAEMON=/var/www/webserver/azra.php
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
PHP_CONFIG_FILE=/etc/php5/cgi/php.ini

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

# If the daemon is not enabled, give the user a warning and then exit,
# unless we are stopping the daemon
if [ "$START" != "yes" -a "$1" != "stop" ]; then
        log_warning_msg "To enable $NAME, edit /etc/default/$NAME and set START=yes"
        exit 0
fi

# Process configuration
export PHP_FCGI_CHILDREN PHP_FCGI_MAX_REQUESTS
DAEMON_ARGS="-q -b $FCGI_HOST:$FCGI_PORT -c $PHP_CONFIG_FILE"

do_start()
{
        # Return
        #   0 if daemon has been started
        #   1 if daemon was already running
        #   2 if daemon could not be started
        start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
                || return 1
        start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON \
                --background --make-pidfile --chuid $EXEC_AS_USER www-data $DAEMON -- \
                $DAEMON_ARGS \
                || return 2
}

do_stop()
{
        # Return
        #   0 if daemon has been stopped
        #   1 if daemon was already stopped
        #   2 if daemon could not be stopped
        #   other if a failure occurred
    killall azra.php
        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE > /dev/null # --name $DAEMON
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2
        # Wait for children to finish too if this is a daemon that forks
        # and if the daemon is only ever run from this initscript.
        # If the above conditions are not satisfied then add some other code
        # that waits for the process to drop all resources that could be
        # needed by services started subsequently.  A last resort is to
        # sleep for some time.
        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
        [ "$?" = 2 ] && return 2
        # Many daemons don't delete their pidfiles when they exit.
        rm -f $PIDFILE
        return "$RETVAL"
}
case "$1" in
  start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  restart|force-reload)
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
          0|1)
                do_start
                case "$?" in
                        0) log_end_msg 0 ;;
                        1) log_end_msg 1 ;; # Old process is still running
                        *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
          *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
  *)
        echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
        exit 3
        ;;
esac

… ve /etc/defaults/Azra:

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START=yes
VERBOSE=yes

Azra multi-process olarak çalışabiliyor.
Ana kod (azra.php)

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#! /usr/bin/php-cgi
<?php
/**
 * Azra Web Server
 *
 * Web Server coded in pure PHP
 *
 * @package     Azra Web Server
 * @author      Can Ince
 * @copyright           Copyright (c) 2010, Logikit / Can Ince.
 * @version             0.0.2
 * @license     http://www.opensource.org/licenses/mit-license.php
 * @link        http://can.logikit.net
 */


set_time_limit(0);

interface server
{
    public function setWebRoot($path);
    public function setPort($port);
    public function serve();
}

final class webserver implements server
{
    public $socket;
    private $_port , $_webroot , $_queryString , $_webRootWithoutSlash, $_input , $_file , $_verbose , $_remoteAddr , $_remotePort;
    public function __construct()
    {
        $this->_verbose = 0;
        $_SERVER = array();
        $_COOKIE = array();
    }
   
    public function setPort($port)
    {
        $this->_port = $port;
    }
   
    public function verbose()
    {
        $this->_verbose = 1;
    }
   
    public function setWebRoot($path)
    {
        $this->_webroot = $path . '/';
        $this->_webRootWithoutSlash = $path;
    }
   
    private function _mimeHandler($input)
    {
            $fileinfo = pathinfo($input);
            switch ($fileinfo['extension'])
            {
                case 'png':
                    $mime = "text/png";  
                    break;
               
                case 'jpg':
                case 'jpeg':
                    $mime = "text/jpeg";  
                    break;
               
                case 'gif':
                    $mime = "text/gif";  
                    break;
               
                case 'css':
                    $mime = "text/css";  
                    break;
                   
                case 'swf':
                    $mime = "application/x-shockwave-flash";
                    break;
             
                default:
                    $mime = "text/html; charset=UTF-8";
            }
        return $mime;
    }
   
    private function _handleCode($contents)
    {
         //eval() edilecek kodun başında <?php ya da <? varsa çakar. halledelim.
        $contents = trim($contents);
        if(substr($contents , 0 , 5) == '<?php')
        {
            $contents = substr($contents , 5);
        }
        elseif(substr($contents , 0 , 2) == '<?')
        {
            $contents = substr($contents , 2);
        }
       
        return $contents;
    }
   
    private function _parseGet($str)
    {
        $_GET = array();
        $array = explode('&' , $str);
        foreach($array as $requestItem)
        {
            $itemArray = explode('=' , $requestItem);
            if(!empty($itemArray[0])) $_GET[$itemArray[0]] = $itemArray[1];
        }
        unset($_GET['hyperTextServer_php']); //bunu $_GET'e enjekte ediyor. neden, bilmiyorum...
    }
   
    private function _parsePost($str)
    {
        $_POST = array();
        $array = explode('&' , $str);
        foreach($array as $requestItem)
        {
            $itemArray = explode('=' , $requestItem);
            if(!empty($itemArray[0])) $_POST[$itemArray[0]] = $itemArray[1];
        }
    }
   
    private function _parseCookie($str)
    {
       
        $array = explode('; ' , $str);
        foreach($array as $requestItem)
        {
            $itemArray = explode('=' , $requestItem);
            if(!empty($itemArray[0])) $_COOKIE[$itemArray[0]] = $itemArray[1];
        }
    }
   
    private function _parseRequest($str)
    {
       
        $lines = explode("\n" , $str);
        $rawData = explode(' ' , $lines[0]);
        $_SERVER['REQUEST_METHOD'] = $rawData[0];
        if($_SERVER['REQUEST_METHOD'] == 'POST') $this->_parsePost(end($lines));
        $_SERVER['PHP_SELF'] = $this->_webRootWithoutSlash . $rawData[1];
        $_SERVER['HTTP_HOST'] = substr($lines[1] , 6);
        $_SERVER['HTTP_USER_AGENT'] = substr($lines[2] , 12);
        $_SERVER['HTTP_ACCEPT'] = substr($lines[3] , 8);
        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = substr($lines[4] , 17);
        $_SERVER['HTTP_ACCEPT_ENCODING'] = substr($lines[5] , 17);
        $_SERVER['HTTP_ACCEPT_CHARSET'] = substr($lines[6] , 16);
        $_SERVER['HTTP_KEEP_ALIVE'] = substr($lines[7] , 12);
        $_SERVER['HTTP_CONNECTION'] = substr($lines[8] , 12);
        if(strstr($lines[9] , 'Referer'))
        {
            $_SERVER['HTTP_REFERER'] = substr($lines[9] , 9);
            $_SERVER['HTTP_COOKIE'] = substr($lines[10] , 8);
        }
        else $_SERVER['HTTP_COOKIE'] = substr($lines[9] , 8);
       
        if(!empty($_SERVER['HTTP_COOKIE'])) $this->_parseCookie($_SERVER['HTTP_COOKIE']);
       
        $_SERVER['SERVER_SIGNATURE'] = ' <address>Azra/0.0.1 Server at ' . $_SERVER['HTTP_HOST'] . ' Port ' . $this->_port . '</address>';
        $_SERVER['SERVER_SOFTWARE'] = 'Azra/0.0.1';
        $_SERVER['DOCUMENT_ROOT'] = $this->_webroot;
        $_SERVER['SCRIPT_FILENAME'] = $this->_webRootWithoutSlash . str_replace('./' , '/' , $this->_file);
        $_SERVER['SCRIPT_NAME'] = $this->_file;
        $_SERVER['REQUEST_TIME'] = time();
        $_SERVER['REMOTE_ADDR'] = $this->_remoteAddr;
        $_SERVER['REMOTE_PORT'] = $this->_remotePort;
        if(!empty($this->_queryString)) $_SERVER['QUERY_STRING'] = $this->_queryString;
    }
   
    private function _handle404()
    {
        return "<title>UHU 404</title><h2>UHU 404</h2>Iın-ıın-ıın-ıın-cav-cav-cav-cav-oooooo - oooooo - zört - zört - zört -zört (araba alarmı efekti) Çok afedersin müdürüm ama yok öyle bir dosya.";
    }
   
    public function openSocket()
    {
        $this->socket = @socket_create_listen($this->_port);
        if (!$this->socket)
        {
            echo "Soket olamiyor!\n";
            exit;
        }
        $this->_loadConfigHandler();
    }
   
    private function _loadCOnfigHandler()
    {
        $directoryConfigCandidate = $this->_webroot . '/.ConfigHandler.php';
       
        if ($directoryConfigCandidate && is_readable($directoryConfigCandidate))
        {
            require ($directoryConfigCandidate);
        }      
    }
   
    public function serve()
    {

        while (1) //daire-i ilanihaye!
        {
            $client = socket_accept($this->socket);
            socket_getpeername($client , $remoteAddr , $remotePort);
            $this->_remoteAddr = $remoteAddr;
            $this->_remotePort = $remotePort;
            $input = $this->_input = trim(socket_read ($client, 4096));
           
            if($this->_verbose == 1) echo $input;
           
            $input = explode(" " , $input);
            $input = $input[1];

            if(class_exists('ConfigHandler'))
            {
                $configHandler = new ConfigHandler($input , $this->_webroot);
 
                //konvansiyonumuza göre rewrite işi $configHandler'ın url özelliğinde bulunmalı
                if($configHandler->url != NULL) $input = realpath($configHandler->url);
            }
             
            $mime = $this->_mimeHandler($input);
               
            if ($input == "" || $input == '/')
            {
                $input = "/index.html";
            }
            $input = ".$input";
            $input = str_replace('//' , '/' , $input);
            $inputArray = explode('?' , $input);
            $this->_file = $inputArray[0];
           
            $input = $this->_webroot . $this->_file;
            if (file_exists($input) && is_readable($input))
            {
                if($this->_verbose == 1) echo "Dosya: $input\n";
                 
                $contents = file_get_contents($input);
                if(strstr($input , '.php'))
                {
                    if(!empty($inputArray[1])) $this->_queryString = $inputArray[1];
                   
                    $this->_parseGet($this->_queryString);
                    $this->_parseRequest($this->_input);
                   
                    $_REQUEST = array_merge($_GET , $_POST , $_COOKIE);
                   
                    $contents = $this->_handleCode($contents);
                   
                    //PHP çalıştıktan sonra sonucu echo etmesini değil, $contents stringine atmasını istiyoruz.
                    ob_start();
                    eval($contents);
                    //gidip $contents'in üstüne yazmak doğru alışkanlık değil ama yeni değişken register etmek istemiyorum
                    $contents = ob_get_contents();
                    ob_end_clean();
                }
                $output = "HTTP/1.0 200 OK\r\nServer: HyperTextServer\r\nConnection: close\r\nContent-Type: $mime\r\n\r\n$contents";
            }
            else
            {
                $contents = $this->_handle404();
                $output = "HTTP/1.0 404 OBJECT NOT FOUND\r\nServer: HyperTextServer\r\nConnection: close\r\nContent-Type: text/html; charset=UTF-8\r\n\r\n$contents";
            }
            socket_write($client, $output);
            socket_close ($client);
        }
        socket_close ($this->socket);
    }
   
    public function start()
    {
        $pids = array();

        $this->openSocket();
        for($i = 0; $i < 10; $i++)
        {
            $pids[$i] = pcntl_fork();
           
                if(!$pids[$i])
                {
                    // child process
                    $this->serve();
                    exit();
                }
        }
       
        for($i = 0; $i < 10; $i++)
        {
            pcntl_waitpid($pids[$i], $status, WUNTRACED);
        }
    }
}

$server = new webserver();
$server->setWebRoot('/var/www/act');
$server->verbose(); //ayrıntıları stdout'a echo et.
$server->setPort(8115);
$server->start();

Ara-sonuçlar:
- Bir kaç sorun hala devam ediyor.
– Session’lar düzgün halledilemiyor.
– include’larda sorun yaşanıyor zira dirname(__FILE__) Azra’nın çalıştığı dizini döndürüyor.
- log işine çözüm bulmak lazım.
– header() kullanarak 302 yollanırken path düzgün alınamıyor.
Bu sorunlar da halledildikten sonra şaka olarak başlayan denememiz oldukça ilginç hale gelecek ve bu benchmarkları korumayı başarabilirsem 0.0.3 sürümüne Launchpad yolları görünüyor.

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Etiketler: , ,

  1. Mehmet Köse’s avatar

    Merhaba, blogu daha önce ziyaret etmiştim ama nasıl bu yazı dizisini kaçırmışım bilmiyorum. bir çırpıda okudum, teşekkürler. Bu arada azra için logo konusunda yardımcı olmak isterim, iletişime geçebilirsiniz.