swoole(4)网络服务模型(多进程master-worker模型)

一:select 与epoll

select:监听并等待多个文件描述符的属性变化(可读、可写、错误异常),调用后select会阻塞,直到有描述符就绪,函数才返回,通过便利fdset,来找到就绪的描述符,并且最大描述符不能超过1024

epoll:相对select来说,更灵活,没有描述符限制,无需轮训,epoll使用一个文件描述符管理多个描述符,将用户关系的文件描述符的事件存放到内核的一个时间表中(当连接有io流事件产生的时候,epoll就会告诉进程有io流事件产生,然后进程就去处理)

代码:(使用swoole中的event事件)

<?php

class Worker {
    //监听socket
    protected $socket = NULL;
    //连接事件回调
    public $onConnect = NULL;
    //接收消息事件回调
    public $onMessage = NULL;
    public $workerNum = 10;

    public function __construct($socket_address) {
        $this->socket = stream_socket_server($socket_address);
    }

    //创建子进程
    public function fork() {
        $this->accept();
    }

    public function accept() {
        swoole_event_add($this->socket,function ($fd){
            //服务端接收客户端请求
            $clientSocket = stream_socket_accept($this->socket);
            if (!empty($clientSocket) && is_callable($this->onConnect)) {
                call_user_func($this->onConnect, $clientSocket);
            }
            swoole_event_add($clientSocket,function ($fd){
                $buffer = fread($fd, 65535);
                //如果数据为空，或者为false,不是资源类型
                if(empty($buffer)){
                    if(feof($fd) || !is_resource($fd)){
                        //触发关闭事件
                        fclose($fd);
                    }
                }
                if (!empty($buffer) && is_callable($this->onMessage)) {
                    call_user_func($this->onMessage, $fd, $buffer);
                }
            });
        });
        echo '非阻塞';
    }

    public function start() {
        $this->fork();
    }
}


$worker = new Worker('tcp://0.0.0.0:9801');

$worker->onConnect = function ($args) {
    echo "新的连接来了.{$args}.PHP_EOL";
};
$worker->onMessage = function ($conn, $message) {
//    var_dump($conn, $message);
    $content = "hello word qwe";
    $http_resonse = "HTTP/1.1 200 OK
";
    $http_resonse .= "Content-Type: text/html;charset=UTF-8
";
    $http_resonse .= "Connection: keep-alive
";
    $http_resonse .= "Server: php socket server
";
    $http_resonse .= "Content-length: " . strlen($content) . "

";
    $http_resonse .= $content;
    fwrite($conn, $http_resonse);
};
$worker->start();

二:多进程master-worker模型

流程设计:

1. master进程,负责处理配置文件读取,启动,终止和维护worker进程数,当worker进程推出后,会自动重新启动新的worker
2. worker进程的主要任务就是完成具体的逻辑(监听端口、接受请求、使用epoll绝收请求,执行业务逻辑关闭连接)

代码:

<?php

class Worker {
    //监听socket
    protected $socket = NULL;
    //连接事件回调
    public $onConnect = NULL;
    //接收消息事件回调
    public $onMessage = NULL;
    public $workerNum = 4;
    public $addr;

    public function __construct($socket_address) {
       $this->addr=$socket_address;
    }

    //创建子进程
    public function fork() {
        for ($i = 0; $i < $this->workerNum; $i++) {
            $pid = pcntl_fork();
            if ($pid < 0) {
                exit('创建失败');
            } else if ($pid > 0) {

            } else {
                $this->accept();
                exit();
            }
        }
        $status = 0;
        //回收子进程
        for ($i = 0; $i < $this->workerNum; $i++) {
            $pid = pcntl_wait($status);
        }
    }

    public function accept() {
        $opts = array(
            'socket' => array(
                'backlog' => '10240',
            ),
        );

        $context = stream_context_create($opts);

        stream_context_set_option($context,'socket','so_reuseport',1);

        $this->socket = stream_socket_server($this->addr,$error,$errstr, STREAM_SERVER_BIND|STREAM_SERVER_LISTEN,$context);
        swoole_event_add($this->socket, function ($fd) {
            //服务端接收客户端请求
            $clientSocket = stream_socket_accept($this->socket);
            if (!empty($clientSocket) && is_callable($this->onConnect)) {
                call_user_func($this->onConnect, $clientSocket);
            }
            swoole_event_add($clientSocket, function ($fd) {
                $buffer = fread($fd, 65535);
                //如果数据为空，或者为false,不是资源类型
                if (empty($buffer)) {
                    if (feof($fd) || !is_resource($fd)) {
                        //触发关闭事件
                        fclose($fd);
                    }
                }
                if (!empty($buffer) && is_callable($this->onMessage)) {
                    call_user_func($this->onMessage, $fd, $buffer);
                }
            });
        });
        echo '非阻塞';
    }

    public function start() {
        $this->fork();
    }
}


$worker = new Worker('tcp://0.0.0.0:9801');

$worker->onConnect = function ($args) {
    echo "新的连接来了.{$args}.PHP_EOL";
};
$worker->onMessage = function ($conn, $message) {
//    var_dump($conn, $message);
    $content = "hello word qwe";
    $http_resonse = "HTTP/1.1 200 OK
";
    $http_resonse .= "Content-Type: text/html;charset=UTF-8
";
    $http_resonse .= "Connection: keep-alive
";
    $http_resonse .= "Server: php socket server
";
    $http_resonse .= "Content-length: " . strlen($content) . "

";
    $http_resonse .= $content;
    fwrite($conn, $http_resonse);
};
$worker->start();