PHP使用Beanstalkd实例详解

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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 PheanstalkPheanstalk;$pheanstalk = new Pheanstalk('192.168.75.135',11300);print_r($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 PheanstalkPheanstalk;$pheanstalk = new Pheanstalk('192.168.75.135',11300);for ($i=0;$i<50;$i++){

$data = array(



'key' => 'testkey'.$i,



'value' => 'testvalue',



'time' => time(),

);

$ret = $pheanstalk->putInTube('test-tube', json_encode($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('default_socket_timeout', 900);require "../vendor/autoload.php";use PheanstalkPheanstalk;$pheanstalk = new Pheanstalk('192.168.75.135',11300);while (true){

$job = $pheanstalk



->watch('test-tube')



->ignore('default')



->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:repositoryworkbeanstalk> php .Producter.phpint(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:repositoryworkbeanstalk> php Status.phpPheanstalkResponseArrayResponse Object(

[_name:PheanstalkResponseArrayResponse: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:repositoryworkbeanstalk> 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:repositoryworkbeanstalk> 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 ExceptionSocketException('Socket closed by server!');





}





if (($data === false) && microtime(true) - $timer > $timeout) {







$this->disconnect();







throw new ExceptionSocketException('Socket timed out!');





}



} while ($data === false);



return rtrim($data);

}

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