PHP使用Beanstalkd实例详解

有关Beanstalkd的基本概念，编译和yum的安装方法已经在上篇文章《Beanstalkd消息/任务队列的详解》中介绍了，今天练习下PHP使用Beanstalkd的过程，我选择的是使用Pheanstalk类来连接Beanstalkd

1.使用Composer安装Pheanstalk

composer require pda/pheanstalk

2.实现代码

php查看beanstalkd状态脚本Status.php

<?php
/**
 * Created by PhpStorm.
 * User: jmsite.cn
 * Date: 2019/1/21
 * Time: 10:32
 */
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk(&#39;192.168.75.135&#39;,11300);
print_r($pheanstalk->stats());

生产者代码Producter.php

<?php
/**
 * Created by PhpStorm.
 * User: jmsite.cn
 * Date: 2019/1/20
 * Time: 16:30
 */
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk(&#39;192.168.75.135&#39;,11300);
for ($i=0;$i<50;$i++){
    $data = array(
        &#39;key&#39; => &#39;testkey&#39;.$i,
        &#39;value&#39; => &#39;testvalue&#39;,
        &#39;time&#39; => time(),
    );
    $ret = $pheanstalk->putInTube(&#39;test-tube&#39;, json_encode($data), Pheanstalk::DEFAULT_PRIORITY, Pheanstalk::DEFAULT_DELAY, Pheanstalk::DEFAULT_TTR);
    var_dump($ret);
}

消费者代码Consumer.php

<?php
/**
 * Created by PhpStorm.
 * User: jmsite.cn
 * Date: 2019/1/20
 * Time: 16:31
 */
set_time_limit(0);
ini_set(&#39;default_socket_timeout&#39;, 900);
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk(&#39;192.168.75.135&#39;,11300);
while (true){
    $job = $pheanstalk
        ->watch(&#39;test-tube&#39;)
        ->ignore(&#39;default&#39;)
        ->reserve();
    if ($job){
        sleep(2);
        echo $job->getData();
        echo "\n";
        $pheanstalk->delete($job);
    }
}

打开命令行/终端窗口，执行生产者，会向tube写入50条任务

PS E:\repository\work\beanstalk> php .\Producter.php
int(101)
int(102)
int(103)
int(104)
int(105)
int(106)
int(107)
int(108)
int(109)
int(110)
int(111)
int(112)
int(113)
int(114)
......

由此可见，$pheanstalk->putInTube成功后返回的是job的id

查看状态

PS E:\repository\work\beanstalk> php Status.php
Pheanstalk\Response\ArrayResponse Object
(
    [_name:Pheanstalk\Response\ArrayResponse:private] => OK
    [storage:ArrayObject:private] => Array
        (
            [current-jobs-urgent] => 0
            [current-jobs-ready] => 50
            [current-jobs-reserved] => 0
            [current-jobs-delayed] => 0
            [current-jobs-buried] => 0
            ......

结果中显示处于ready待读取状态的job是50个

打开两个或以上命令行/终端窗口，执行消费者，模拟多消费者竞争

消费者1

PS E:\repository\work\beanstalk> php .\Consumer.php
{"key":"testkey0","value":"testvalue","time":1548039103}
{"key":"testkey1","value":"testvalue","time":1548039103}
{"key":"testkey2","value":"testvalue","time":1548039103}
{"key":"testkey4","value":"testvalue","time":1548039103}
{"key":"testkey6","value":"testvalue","time":1548039103}
{"key":"testkey8","value":"testvalue","time":1548039103}
{"key":"testkey10","value":"testvalue","time":1548039103}
{"key":"testkey12","value":"testvalue","time":1548039103}
{"key":"testkey14","value":"testvalue","time":1548039103}
{"key":"testkey16","value":"testvalue","time":1548039103}
{"key":"testkey18","value":"testvalue","time":1548039103}
{"key":"testkey20","value":"testvalue","time":1548039103}
{"key":"testkey22","value":"testvalue","time":1548039103}
{"key":"testkey24","value":"testvalue","time":1548039103}
{"key":"testkey26","value":"testvalue","time":1548039103}
{"key":"testkey28","value":"testvalue","time":1548039103}
{"key":"testkey30","value":"testvalue","time":1548039103}
{"key":"testkey32","value":"testvalue","time":1548039103}
{"key":"testkey34","value":"testvalue","time":1548039103}
{"key":"testkey36","value":"testvalue","time":1548039103}
{"key":"testkey38","value":"testvalue","time":1548039103}
{"key":"testkey40","value":"testvalue","time":1548039103}
{"key":"testkey42","value":"testvalue","time":1548039103}
{"key":"testkey44","value":"testvalue","time":1548039103}
{"key":"testkey46","value":"testvalue","time":1548039103}
{"key":"testkey48","value":"testvalue","time":1548039103}

消费者2

PS E:\repository\work\beanstalk> php .\Consumer.php
{"key":"testkey3","value":"testvalue","time":1548039103}
{"key":"testkey5","value":"testvalue","time":1548039103}
{"key":"testkey7","value":"testvalue","time":1548039103}
{"key":"testkey9","value":"testvalue","time":1548039103}
{"key":"testkey11","value":"testvalue","time":1548039103}
{"key":"testkey13","value":"testvalue","time":1548039103}
{"key":"testkey15","value":"testvalue","time":1548039103}
{"key":"testkey17","value":"testvalue","time":1548039103}
{"key":"testkey19","value":"testvalue","time":1548039103}
{"key":"testkey21","value":"testvalue","time":1548039103}
{"key":"testkey23","value":"testvalue","time":1548039103}
{"key":"testkey25","value":"testvalue","time":1548039103}
{"key":"testkey27","value":"testvalue","time":1548039103}
{"key":"testkey29","value":"testvalue","time":1548039103}
{"key":"testkey31","value":"testvalue","time":1548039103}
{"key":"testkey33","value":"testvalue","time":1548039103}
{"key":"testkey35","value":"testvalue","time":1548039103}
{"key":"testkey37","value":"testvalue","time":1548039103}
{"key":"testkey39","value":"testvalue","time":1548039103}
{"key":"testkey41","value":"testvalue","time":1548039103}
{"key":"testkey43","value":"testvalue","time":1548039103}
{"key":"testkey45","value":"testvalue","time":1548039103}
{"key":"testkey47","value":"testvalue","time":1548039103}
{"key":"testkey49","value":"testvalue","time":1548039103}

两个消费者竞争着完成了全部任务，由于我的beanstalkd启动时开启了binlog持久，所以beanstalkd重启后任务也不会丢失

3.需要注意的事项

1.创建job时，设置的超时时间Pheanstalk::DEFAULT_TTR一定要比消费者处理一个job的时间要长，否则job在超时之后会被tube更改为ready状态，被其他消费者获取，而此时当前消费者还在处理该job，这就出现了一个job被多个消费者重复执行的可怕现象

2.Pheanstalk的维护者发生了变化，在新版的Pheanstalk中是不支持长连接的，当客户端socket连接服务器时间超过php.ini中设置的default_socket_timeout时，如果未能从服务端tube获得job，连接将会被断开，所以消费者进程需要维护，以便在退出后可以重新开启进程，推荐使用supervisord维护消费者进程。

判断socket超时的代码

public function getLine($length = null)
    {
        $timeout = ini_get('default_socket_timeout');
        $timer   = microtime(true);
        do {
            $data = isset($length) ?
                $this->_wrapper()->fgets($this->_socket, $length) :
                $this->_wrapper()->fgets($this->_socket);
            if ($this->_wrapper()->feof($this->_socket)) {
                throw new Exception\SocketException('Socket closed by server!');
            }
            if (($data === false) && microtime(true) - $timer > $timeout) {
                $this->disconnect();
                throw new Exception\SocketException('Socket timed out!');
            }
        } while ($data === false);
        return rtrim($data);
    }

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