PHP使用Beanstalkd實例詳解-php教程-PHP中文網

有關Beanstalkd的基本概念，編譯和yum的安裝方法已經在上篇文章《Beanstalkd訊息/任務佇列的詳解》中介紹了，今天練習下PHP使用Beanstalkd的過程，我選擇的是使用Pheanstalk類別來連接Beanstalkd

1.使用Composer安裝Pheanstalk

composer require pda/pheanstalk

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2.實作程式碼

#php查看beanstalkd狀態腳本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());

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生產者程式碼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);
}

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消費者程式碼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);
    }
}

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開啟命令列/終端窗口，執行生產者，會向tube寫入50個任務

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)
......

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由此可見，$pheanstalk->putInTube成功後返回的是job的id

查看狀態

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
            ......

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結果中顯示處於ready待讀取狀態的job是50個

開啟兩個或更多命令列/終端窗口，執行消費者，模擬多消費者競爭

消費者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}

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消費者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}

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兩個消費者競爭著完成了全部任務，由於我的beanstalkd啟動時開啟了binlog持久，所以beanstalkd重啟後任務也不會丟失

#3.需要注意的事項

1.創建job時，設定的超時時間Pheanstalk::DEFAULT_TTR一定要比消費者處理一個job的時間要長，否則job在逾時之後會被tube改為ready狀態，被其他消費者獲取，而此時當前消費者還在處理該job，這就出現了一個job被多個消費者重複執行的可怕現象

# 2.Pheanstalk的維護者發生了變化，在新版的Pheanstalk中是不支援長連接的，當客戶端socket連接伺服器時間超過php.ini中設定的default_socket_timeout時，如果未能從服務端tube獲得job，連接將會被斷開，所以消費者進程需要維護，以便在退出後可以重新開啟進程，建議使用supervisord維護消費者進程。

判斷socket逾時的程式碼

public function getLine($length = null)
    {
        $timeout = ini_get(&#39;default_socket_timeout&#39;);
        $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(&#39;Socket closed by server!&#39;);
            }
            if (($data === false) && microtime(true) - $timer > $timeout) {
                $this->disconnect();
                throw new Exception\SocketException(&#39;Socket timed out!&#39;);
            }
        } while ($data === false);
        return rtrim($data);
    }

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