PHP simulates supervisor process management-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

PHP simulates supervisor process management

藏色散人

Jan 08, 2021 pm 01:53 PM

php

Recommended: "PHP Video Tutorial"

Preface

Simulating supervisor process management DEMO (simple implementation)

That’s right, it’s about making wheels! The purpose is to learn!

Screenshot:
PHP simulates supervisor process management

I have implemented the function of a Copy subprocess in the picture. I think it would be very useful if used in AMQP when adding or removing consumers.

Implementation

1. Start the sub-process in the main process loop to execute the command
2. Enter 127.0.0.1:7865 on the web to obtain the sub-process Status
3. The socket receives the request message, performs the corresponding operation, and returns to the web page.
4. Recycle the child process to prevent it from being called a zombie process.

Insufficiency: Unable to continue to monitor the error page. Since the response from the socket is loaded through the include function, the tail -f command cannot appear in the loaded page, otherwise the stream will fall into an infinite loop~. I think there should be a solution (I wrote the socket multi-process mode to imitate the mode in which fpm starts a sub-process to handle the request after receiving it, but there are problems with the execution. So I posted the code in the hope of getting everyone's advice).
Extension: Since the process can be well managed (expected), you can customize some of your own needs, such as: (1) Customize AMQP consumer process management services. (2) Simulate crontab timing service.

Knowledge points

In the process of code implementation, there are many details worth learning.
1. In the while() loop, the non-blocking mode of stream is enabled. So you cannot use sleep(1) in a loop, but use stream_select($read, $write, $except, 1) to block the stream internally.
For blocking and non-blocking modes, please refer here
2. There are many functions that can execute external programs, but they are all slightly different. proc_open is used here, which is a very powerful function. Before this, I have used pcntl_exec to execute external programs, but I need to pcntl_fork first. However, other methods such as exec and shell_exec cannot manage child processes.
3. When restarting or stopping a child process, it only changes the state of the child process in the memory of the main process first, and does not really operate on the child process. At the same place init() handles the child process. This can prevent some weird phenomena caused by the context when the child process is started.

Code

Because there are too many codes, if you have better suggestions for my solution, you can see it here on github.

Main process code: Process.php

<?php require_once __DIR__ . &#39;/Consumer.php&#39;;require_once __DIR__ . &#39;/StreamConnection.php&#39;;require_once __DIR__ . &#39;/Http.php&#39;;class Process{
    /** 
     * 待启动的消费者数组
     */
    protected $consumers = array();
    protected $childPids = array();

    const PPID_FILE = __DIR__ . &#39;/process&#39;;
    protected $serializerConsumer;

    public function __construct()
    {
        $this->consumers = $this->getConsumers();
    }

    // 这里是个DEMO，实际可以用读取配置文件的方式。
    public function getConsumers()
    {
        $consumer = new Consumer([
            'program' => 'test',
            'command' => '/usr/bin/php test.php',
            'directory' => __DIR__,
            'logfile' => __DIR__ . '/test.log',
            'uniqid' => uniqid(),
            'auto_restart' => false,
        ]);
        return [
            $consumer->uniqid => $consumer,
        ];
    }

    public function run()
    {
        if (empty($this->consumers)) {
            // consumer empty
            return;
        }
        if ($this->_notifyMaster()) {
            // master alive
            return;
        }

        $pid = pcntl_fork();
        if ($pid  0) {
            exit;
        }
        if (!posix_setsid()) {
            exit;
        }

        $stream = new StreamConnection('tcp://0.0.0.0:7865');
        @cli_set_process_title('AMQP Master Process');
        // 将主进程ID写入文件
        file_put_contents(self::PPID_FILE, getmypid());
        // master进程继续
        while (true) {
            $this->init();
            pcntl_signal_dispatch();
            $this->waitpid();
            // 如果子进程被全部回收，则主进程退出
            // if (empty($this->childPids)) {
            //     $stream->close($stream->getSocket());
            //     break;
            // }
            $stream->accept(function ($uniqid, $action) {
                $this->handle($uniqid, $action);
                return $this->display();
            });
        }
    }

    protected function init()
    {
        foreach ($this->consumers as &$c) {
            switch ($c->state) {
                case Consumer::RUNNING:
                case Consumer::STOP:
                    break;
                case Consumer::NOMINAL:
                case Consumer::STARTING:
                    $this->fork($c);
                    break;
                case Consumer::STOPING:
                    if ($c->pid && posix_kill($c->pid, SIGTERM)) {
                        $this->reset($c, Consumer::STOP);
                    }
                    break;
                case Consumer::RESTART:
                    if (empty($c->pid)) {
                        $this->fork($c);
                        break;
                    }
                    if (posix_kill($c->pid, SIGTERM)) {
                        $this->reset($c, Consumer::STOP);
                        $this->fork($c);
                    }
                    break;
                default:
                    break;
            }
        }
    }

    protected function reset(Consumer $c, $state)
    {
        $c->pid = '';
        $c->uptime = '';
        $c->state = $state;
        $c->process = null;
    }

    protected function waitpid()
    {
        foreach ($this->childPids as $uniqid => $pid) {
            $result = pcntl_waitpid($pid, $status, WNOHANG);
            if ($result == $pid || $result == -1) {
                unset($this->childPids[$uniqid]);
                $c = &$this->consumers[$uniqid];
                $state = pcntl_wifexited($status) ? Consumer::EXITED : Consumer::STOP;
                $this->reset($c, $state);
            }
        }
    }


    /**
     * 父进程存活情况下，只会通知父进程信息，否则可能产生多个守护进程
     */
    private function _notifyMaster()
    {
        $ppid = file_get_contents(self::PPID_FILE );
        $isAlive = $this->checkProcessAlive($ppid);
        if (!$isAlive) return false;
        return true;
    }

    public function checkProcessAlive($pid)
    {
        if (empty($pid)) return false;
        $pidinfo = `ps co pid {$pid} | xargs`;
        $pidinfo = trim($pidinfo);
        $pattern = "/.*?PID.*?(\d+).*?/";
        preg_match($pattern, $pidinfo, $matches);
        return empty($matches) ? false : ($matches[1] == $pid ? true : false);
    }

    /**
     * fork一个新的子进程
     */
    protected function fork(Consumer $c)
    {
        $descriptorspec = [2 => ['file', $c->logfile, 'a'],];
        $process = proc_open('exec ' . $c->command, $descriptorspec, $pipes, $c->directory);
        if ($process) {
            $ret = proc_get_status($process);
            if ($ret['running']) {
                $c->state = Consumer::RUNNING;
                $c->pid = $ret['pid'];
                $c->process = $process;
                $c->uptime = date('m-d H:i');
                $this->childPids[$c->uniqid] = $ret['pid'];
            } else {
                $c->state = Consumer::EXITED;
                proc_close($process);
            }
        } else {
            $c->state = Consumer::ERROR;
        }
        return $c;
    }

    public function display()
    {
        $location = 'http://127.0.0.1:7865';
        $basePath = Http::$basePath;
        $scriptName = isset($_SERVER['SCRIPT_NAME']) &&
            !empty($_SERVER['SCRIPT_NAME']) &&
            $_SERVER['SCRIPT_NAME'] != '/' ? $_SERVER['SCRIPT_NAME'] : '/index.php';
        if ($scriptName == '/index.html') {
            return Http::status_301($location);
        }

        $sourcePath = $basePath . $scriptName;
        if (!is_file($sourcePath)) {
            return Http::status_404();
        }

        ob_start();
        include $sourcePath;
        $response = ob_get_contents();
        ob_clean();

        return Http::status_200($response);
    }

    public function handle($uniqid, $action)
    {
        if (!empty($uniqid) && !isset($this->consumers[$uniqid])) {
            return;
        }
        switch ($action) {
            case 'refresh':
                break;
            case 'restartall':
                $this->killall(true);
                break;
            case 'stopall':
                $this->killall();
                break;
            case 'stop':
                $c = &$this->consumers[$uniqid];
                if ($c->state != Consumer::RUNNING) break;
                $c->state = Consumer::STOPING;
                break;
            case 'start':
                $c = &$this->consumers[$uniqid];
                if ($c->state == Consumer::RUNNING) break;
                $c->state = Consumer::STARTING;
                break;
            case 'restart':
                $c = &$this->consumers[$uniqid];
                $c->state = Consumer::RESTART;
                break;
            case 'copy':
                $c = $this->consumers[$uniqid];
                $newC = clone $c;
                $newC->uniqid = uniqid('C');
                $newC->state = Consumer::NOMINAL;
                $newC->pid = '';
                $this->consumers[$newC->uniqid] = $newC;
                break;
            default:
                break;
        }
    }

    protected function killall($restart = false)
    {
        foreach ($this->consumers as &$c) {
            $c->state = $restart ? Consumer::RESTART : Consumer::STOPING;
        }
    }}$cli = new Process();$cli->run();

Copy after login

Consumer consumer object

<?php require_once __DIR__ . &#39;/BaseObject.php&#39;;class Consumer extends BaseObject{
    /** 开启多少个消费者 */
    public $numprocs = 1;
    /** 当前配置的唯一标志 */
    public $program;
    /** 执行的命令 */
    public $command;
    /** 当前工作的目录 */
    public $directory;

    /** 通过 $qos $queueName $duplicate 生成的 $queue */
    public $queue;
    /** 程序执行日志记录 */
    public $logfile = &#39;&#39;;
    /** 消费进程的唯一ID */
    public $uniqid;
    /** 进程IDpid */
    public $pid;
    /** 进程状态 */
    public $state = self::NOMINAL;
    /** 自启动 */
    public $auto_restart = false;

    public $process;
    /** 启动时间 */
    public $uptime;

    const RUNNING = &#39;running&#39;;
    const STOP = &#39;stoped&#39;;
    const NOMINAL = &#39;nominal&#39;;
    const RESTART = &#39;restart&#39;;
    const STOPING = &#39;stoping&#39;;
    const STARTING = &#39;stating&#39;;
    const ERROR = &#39;error&#39;;
    const BLOCKED = &#39;blocked&#39;;
    const EXITED = &#39;exited&#39;;
    const FATEL = &#39;fatel&#39;;}

Copy after login

stream related code: StreamConnection.php

<?php class StreamConnection{
    protected $socket;
    protected $timeout = 2; //s
    protected $client;

    public function __construct($host)
    {
        $this->socket = $this->connect($host);
    }

    public function connect($host)
    {
        $socket = stream_socket_server($host, $errno, $errstr);
        if (!$socket) {
            exit('stream error');
        }
        stream_set_timeout($socket, $this->timeout);
        stream_set_chunk_size($socket, 1024);
        stream_set_blocking($socket, false);
        $this->client = [$socket];
        return $socket;
    }

    public function accept(Closure $callback)
    {
        $read = $this->client;
        if (stream_select($read, $write, $except, 1) socket, $read)) {
            $cs = stream_socket_accept($this->socket);
            $this->client[] = $cs;
        }
        foreach ($read as $s) {
            if ($s == $this->socket) continue;
            $header = fread($s, 1024);
            if (empty($header)) {
                $index = array_search($s, $this->client);
                if ($index)
                    unset($this->client[$index]);
                $this->close($s);
                continue;
            }
            Http::parse_http($header);
            $uniqid = isset($_GET['uniqid']) ? $_GET['uniqid'] : '';
            $action = isset($_GET['action']) ? $_GET['action'] : '';
            $response = $callback($uniqid, $action);
            $this->write($s, $response);
            $index = array_search($s, $this->client);
            if ($index)
                unset($this->client[$index]);
            $this->close($s);
        }
    }

    public function write($socket, $response)
    {
        $ret = fwrite($socket, $response, strlen($response));
    }

    public function close($socket)
    {
        $flag = fclose($socket);
    }

    public function getSocket()
    {
        return $this->socket;
    }}

Copy after login

Http response Code: Http.php

<?php class Http{

    public static $basePath = __DIR__ . &#39;/views&#39;;
    public static $max_age = 120; //秒

    /*
    *  函数:     parse_http
    *  描述:     解析http协议
    */
    public static function parse_http($http)
    {
        // 初始化
        $_POST = $_GET = $_COOKIE = $_REQUEST = $_SESSION = $_FILES =  array();
        $GLOBALS[&#39;HTTP_RAW_POST_DATA&#39;] = &#39;&#39;;
        // 需要设置的变量名
        $_SERVER = array(
            &#39;QUERY_STRING&#39; => '',
            'REQUEST_METHOD' => '',
            'REQUEST_URI' => '',
            'SERVER_PROTOCOL' => '',
            'SERVER_SOFTWARE' => '',
            'SERVER_NAME' => '',
            'HTTP_HOST' => '',
            'HTTP_USER_AGENT' => '',
            'HTTP_ACCEPT' => '',
            'HTTP_ACCEPT_LANGUAGE' => '',
            'HTTP_ACCEPT_ENCODING' => '',
            'HTTP_COOKIE' => '',
            'HTTP_CONNECTION' => '',
            'REMOTE_ADDR' => '',
            'REMOTE_PORT' => '0',
            'SCRIPT_NAME' => '',
            'HTTP_REFERER' => '',
            'CONTENT_TYPE' => '',
            'HTTP_IF_NONE_MATCH' => '',
        );

        // 将header分割成数组
        list($http_header, $http_body) = explode("\r\n\r\n", $http, 2);
        $header_data = explode("\r\n", $http_header);

        list($_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI'], $_SERVER['SERVER_PROTOCOL']) = explode(' ', $header_data[0]);

        unset($header_data[0]);
        foreach ($header_data as $content) {
            // \r\n\r\n
            if (empty($content)) {
                continue;
            }
            list($key, $value) = explode(':', $content, 2);
            $key = strtolower($key);
            $value = trim($value);
            switch ($key) {
                case 'host':
                    $_SERVER['HTTP_HOST'] = $value;
                    $tmp = explode(':', $value);
                    $_SERVER['SERVER_NAME'] = $tmp[0];
                    if (isset($tmp[1])) {
                        $_SERVER['SERVER_PORT'] = $tmp[1];
                    }
                    break;
                case 'cookie':
                    $_SERVER['HTTP_COOKIE'] = $value;
                    parse_str(str_replace('; ', '&', $_SERVER['HTTP_COOKIE']), $_COOKIE);
                    break;
                case 'user-agent':
                    $_SERVER['HTTP_USER_AGENT'] = $value;
                    break;
                case 'accept':
                    $_SERVER['HTTP_ACCEPT'] = $value;
                    break;
                case 'accept-language':
                    $_SERVER['HTTP_ACCEPT_LANGUAGE'] = $value;
                    break;
                case 'accept-encoding':
                    $_SERVER['HTTP_ACCEPT_ENCODING'] = $value;
                    break;
                case 'connection':
                    $_SERVER['HTTP_CONNECTION'] = $value;
                    break;
                case 'referer':
                    $_SERVER['HTTP_REFERER'] = $value;
                    break;
                case 'if-modified-since':
                    $_SERVER['HTTP_IF_MODIFIED_SINCE'] = $value;
                    break;
                case 'if-none-match':
                    $_SERVER['HTTP_IF_NONE_MATCH'] = $value;
                    break;
                case 'content-type':
                    if (!preg_match('/boundary="?(\S+)"?/', $value, $match)) {
                        $_SERVER['CONTENT_TYPE'] = $value;
                    } else {
                        $_SERVER['CONTENT_TYPE'] = 'multipart/form-data';
                        $http_post_boundary = '--' . $match[1];
                    }
                    break;
            }
        }

        // script_name
        $_SERVER['SCRIPT_NAME'] = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);

        // QUERY_STRING
        $_SERVER['QUERY_STRING'] = parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY);
        if ($_SERVER['QUERY_STRING']) {
            // $GET
            parse_str($_SERVER['QUERY_STRING'], $_GET);
        } else {
            $_SERVER['QUERY_STRING'] = '';
        }

        // REQUEST
        $_REQUEST = array_merge($_GET, $_POST);

        return array('get' => $_GET, 'post' => $_POST, 'cookie' => $_COOKIE, 'server' => $_SERVER, 'files' => $_FILES);
    }

    public static function status_404()
    {
        return <p>Script to be executed: test.php</p><pre class="brush:php;toolbar:false"><?php while(true) {
    file_put_contents(__DIR__  .  &#39;/test.log&#39;, date(&#39;Y-m-d H:i:s&#39;));
    sleep(1);}

Copy after login

For more programming-related knowledge, please visit: Programming teaching! !

The above is the detailed content of PHP simulates supervisor process management. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

How to fix KB5055523 fails to install in Windows 11?

3 weeks ago By DDD

How to fix KB5055518 fails to install in Windows 10?

3 weeks ago By DDD

Roblox: Dead Rails - How To Tame Wolves

4 weeks ago By DDD

Strength Levels for Every Enemy & Monster in R.E.P.O.

4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Roblox: Grow A Garden - Complete Mutation Guide

2 weeks ago By DDD

Hot Tools

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

Java Tutorial

1658

CakePHP Tutorial

1415

Laravel Tutorial

1309

PHP Tutorial

1257

C# Tutorial

1231

Related knowledge

How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP: A Key Language for Web Development Apr 13, 2025 am 12:08 AM

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

See all articles