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用 Socket 和 Pcntl 实现一个多线程服务器（一）

文章来源：365jz.com 点击数：1841 更新时间：2009-09-28 09:24 参与评论

要建立一个简单的服务，如果不考虑性能方面的问题，比如并发100 左右的服务，可以简单的用 Socket + Pcntl。
来实现，我准备写一个系列的教程，让新手就能进行编写socket 服务。
下面要实现的是这样一个服务，就是能进行加减乘除的四则运算。数字可以是任意大的数。可以用下面的命令测试这个服务：
telnet 122.224.124.251 8086
就会进入下面的界面：

Welcome to the PHP Test Server.

To quit, type 'quit'.
#

输入quit 就可以退出。
下面演示功能：
输入： 11111111111111111111111 * 222222222222222222222222222

# 11111111111111111111111 * 222222222222222222222222222
# result is : 2469135802469135802469111108641975308641975308642.
就能把结果计算出来。

这个演示的服务，可以多个人同时进行运算。这个或许就是一个基本的多线程服务，比如，web服务器
就是一个多线程服务，但是，它要处理大量线程，进程的并发问题。所以比较复杂。
下面是代码, 具体的解释就在后面的教程中了。

这个类是处理的是进程控制，具体的逻辑处理封装在了 clientHandle 这个回调函数里面。通过修改这个回调
函数的内容，你也能很快的定制一个自己的服务器。

<?php
class Simple_Server
{
    private $sock;

    private $csock;

    private $isListen = true;

    private $callback;

    private $user;

    private $uid;

    private $gid;

    private $userHome;


    private $scriptName = "simple-server";



    /**
     * use $user set the user run the script.
     * fock a thread, init the socket, and wait user to request.
     *
     */
    function __construct($callback, $ip = '127.0.0.1', $port = '8086',$user = 'daemon')
    {
        error_reporting(E_ALL);
        ini_set("display_errors", 0);
        set_time_limit(0);
        ob_implicit_flush();
        declare(ticks = 1);
        $this->callback = $callback;
        $this->user = $user;

        $this->getUserInfo();
        $this->changeIdentity();
        $this->daemon();

        pcntl_signal(SIGTERM, array($this, 'sigHandler'));
        pcntl_signal(SIGINT,  array($this, 'sigHandler'));
        pcntl_signal(SIGCHLD, array($this, 'sigHandler'));

        $this->run($ip, $port);
    }

    function run($address, $port)
    {
        if(($this->sock = socket_create(AF_INET, SOCK_STREAM, 0)) === false)
        {
            $this->error("failed to create socket: ".socket_strerror($this->sock));
        }

        $sock = $this->sock;

        if(($ret = socket_bind($sock, $address, $port)) === false)
        {
            $this->error("failed to bind socket: ".socket_strerror($ret));
        }

        if(($ret = socket_listen($sock, 0)) === false)
        {
            $this->error("failed to listen to socket: ".socket_strerror($ret));
        }

        socket_set_nonblock($sock);

        $this->log("waiting for clients to connect");

        while ($this->isListen)
        {
            $this->csock = @socket_accept($sock);
            if ($this->csock === false)
            {
                usleep(1000); //1ms
            } else if ($this->csock > 0) {
                $this->client();
            } else {
                $this->error("error: ".socket_strerror($this->csock));
            }
        }
    }

    /**
      * Handle a new client connection
      */
    function client()
    {
        $this->log('begin client');
        $ssock = $this->sock;
        $csock = $this->csock;
        $pid = pcntl_fork();
        if ($pid == -1)
        {
            $this->error("fock clinet child error.");
        } else if ($pid == 0)  {
            $pid = posix_getpid();
            $this->log("begin client child ($pid).");
            /* child process */
            $this->isListen = false;
            $this->log("close sock in child");
            socket_close($ssock);
            $this->log("begin handle user logic.");
            $callback = $this->callback;
            call_user_func($callback, $csock, $this);
            $this->log("end handle user logic.");
            $this->log("close client sock in child.");
            socket_close($csock);
            $this->log("end client");
        } else  {
            $this->log("close csock in child");
            socket_close($csock);
        }
    }

    function __destruct()
    {
        @socket_close($this->sock);
        @socket_close($this->csock);
        $pid = posix_getpid();
        $this->log("end daemon in __destruct pid($pid).");
    }

    function getUserInfo()
    {
        $uid_name = posix_getpwnam($this->user);
        $this->uid = $uid_name['uid'];
        $this->gid = $uid_name['gid'];
        $this->userHome = $uid_name['dir'];
    }

    function changeIdentity()
    {
        if(!posix_setuid($this->uid))
        {
            $this->error("Unable to setuid to " . $this->uid);
        }
    }

    /**
     * Signal handler
     */
    function sigHandler($sig)
    {
        switch($sig)
        {
            case SIGTERM:
            case SIGINT:
                exit();
            break;

            case SIGCHLD:
                pcntl_waitpid(-1, $status);
            break;
        }
    }

    function error($msg)
    {
        $str = date("Y-m-d H:i:s") . " " . $msg . "\n";
        file_put_contents(dirname(__FILE__) . "/error.log", $str, FILE_APPEND);
        exit(0);
    }

    function log($msg)
    {
        $str = date("Y-m-d H:i:s") . " " . $msg . "\n";
        file_put_contents(dirname(__FILE__) . "/message.log", $str, FILE_APPEND);
    }

    function daemon()
    {
        $ppid = posix_getpid();
        $this->log("begin parent daemon pid ($ppid)");
        $pid = pcntl_fork();
        if ($pid == -1)
        {
            /* fork failed */
            $this->error("fork failure!");
        } else if ($pid) {
            /* close the parent */
            $this->log("end parent daemon pid($ppid) exit.");
            exit();
        } else  {
            /* child becomes our daemon */
            posix_setsid();
            chdir($this->userHome);
            umask(0);
            $pid = posix_getpid();
            $this->log("begin child daemon pid($pid).");
        }
    }
}

function clientHandle($msgsock, $obj)
{
    /* Send instructions. */
    $br = "\r\n";
    $msg = "$br Welcome to the PHP Test Server. $br $br To quit, type 'quit'.$br# ";

    $obj->log($msg);
    socket_write($msgsock, $msg, strlen($msg));
    $nbuf = '';
    socket_set_block($msgsock);
    bcscale(4);  // defalult 4 eg. 1 + 2.00001 = 3
    do {
        if (false === ($nbuf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) {
            $obj->error("socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)));
        }

        if (!$nbuf = trim($nbuf)) {
            continue;
        }

        if ($nbuf == 'quit') {
            break;
        }
        if ($nbuf == 'shutdown') {
            break;
        }

        if (empty($nbuf)) continue;

        preg_match("/([\d.]+)[\s]*([+\-*\/x])[\s]*([\d.]+)/i", $nbuf , $matches);
        $op   = @$matches[2];
        $left = @$matches[1];
        $right = @$matches[3];

        $result = NULL;
        if ($op == "+") {
            $result = bcadd($left, $right);
        } else if ($op == "-") {
            $result = bcsub($left, $right);
        } else if ($op == "x" || $op == "x" || $op == "*") {
            $result = bcmul($left, $right);
        } else if ($op == "/") {
            $result = bcdiv($left, $right);
        } else {
            $talkback = "# error: expression \"$nbuf\" error.$br# ";
        }
        if ($result === NULL) {
            socket_write($msgsock, $talkback, strlen($talkback));
        } else {
            $result = rtrim($result, ".0");
            $talkback = "# result is : $result.$br# ";
            socket_write($msgsock, $talkback, strlen($talkback));
        }
        $nbuf = '';
    } while (true);
}

$server = new Simple_Server("clientHandle", "122.224.124.251");
?>

Tag标签: php,PCNTL,Socket

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