PHP使用Redis的List(列表)命令实现消息队列

使用Redis的List(列表)命令实现消息队列，生产者使用lPush命令发布消息，消费者使用rpoplpush命令获取消息，同时将消息放入监听队列，如果处理超时，监听者将把消息弹回消息队列

1.用到的List(列表)命令

2.队列的组成

3.php实现代码

生产者Producter.php

<?php
try {
    //声明消息队列-list的键名
    $queueKey = 'testQueueKey';
    $redis = new Redis();
    $redis->connect('ip',6379);
    //向列表中push10条消息
    for ($i = 0;$i < 10;$i++){
        //为消息生成唯一标识
        $uniqid = uniqid(mt_rand(10000,99999).getmypid().memory_get_usage(),true);
        $ret = $redis->lPush($queueKey,json_encode(array('uniqid' => $uniqid,'key' => 'key-'.$i,'value' => 'data')));
        var_dump($ret);
    }

} catch (Exception $e){
    echo $e->getMessage();
}

消费者Consumer.php

<?php
try {
    //声明消息队列-list的键名
    $queueKey = 'testQueueKey';
    //声明监听者队列-list的键名
    $watchQueueKey = 'watchQueueKey';
    $redis = new Redis();
    $redis->connect('ip',6379);
    //队列先进先出，弹出最先加入的消息，同时放入监听队列
    while (true){
        $ret = $redis->rpoplpush($queueKey,$watchQueueKey);
        if ($ret === false){
            sleep(1);
        } else {
            $retArray = json_decode($ret,true);
            //将唯一id写入缓存设置有效期
            $redis->setex($retArray['uniqid'],60,0);
            //模拟失败
            $rand = mt_rand(0,9);
            if ($rand < 3){
                echo "failure:".$ret."n";
            } else {
                //todo
                //处理成功移除消息
                $redis->lRem($watchQueueKey,$ret,0);
                echo "success:".$ret."n";
            }
        }
    }

} catch (Exception $e){
    echo $e->getMessage();
}

监听者Watcher.php

<?php
try {
    //声明消息队列-list的键名
    $queueKey = 'testQueueKey';
    //声明监听者队列-list的键名
    $watchQueueKey = 'watchQueueKey';
    $redis = new Redis();
    $redis->connect('ip',6379);

    while (true){
        //取出列表尾部的一个值
        $ret = $redis->lIndex($watchQueueKey,-1);
        //如果不存在则休眠1秒
        if ($ret === false){
            sleep(1);
        } else {
            $retArray = json_decode($ret,true);
            $idCache = $redis->get($retArray['uniqid']);
            if ($idCache === false){
                //如果已过期，表示任务超时，弹回原队列
                $redis->rpoplpush($watchQueueKey,$queueKey);
                echo "rpoplpush:".$ret."n";
            } else {
                //处理中，继续等待
                sleep(1);
            }
        }
    }

} catch (Exception $e){
    echo $e->getMessage();
}

4.执行队列

开启监听者php Watcher.php
开启消费者php Consumer.php
执行生产者php Producter.php
生产者输出

int(1)
int(2)
int(3)
int(4)
int(5)
int(6)
int(7)
int(8)
int(9)
int(10)

监听者输出

rpoplpush:{"uniqid":"28580267323642245c4bde640dd8f3.30292468","key":"key-1","value":"data"}
rpoplpush:{"uniqid":"10258267323642245c4bde640e1cd9.95656605","key":"key-4","value":"data"}
rpoplpush:{"uniqid":"43356267323642245c4bde640e88e9.50566706","key":"key-5","value":"data"}
rpoplpush:{"uniqid":"59823267323642245c4bde640e98b5.51512314","key":"key-6","value":"data"}
rpoplpush:{"uniqid":"83293267323642245c4bde640ed753.04622366","key":"key-9","value":"data"}

消费者输出

success:{"uniqid":"47280267323557445c4bde640dbfb4.78962728","key":"key-0","value":"data"}
failure:{"uniqid":"28580267323642245c4bde640dd8f3.30292468","value":"data"}
success:{"uniqid":"39394267323642245c4bde640de992.34641654","key":"key-2","value":"data"}
success:{"uniqid":"41335267323642245c4bde640df980.38466514","key":"key-3","value":"data"}
failure:{"uniqid":"10258267323642245c4bde640e1cd9.95656605","value":"data"}
failure:{"uniqid":"43356267323642245c4bde640e88e9.50566706","value":"data"}
failure:{"uniqid":"59823267323642245c4bde640e98b5.51512314","value":"data"}
success:{"uniqid":"43817267323642245c4bde640ec189.44008738","key":"key-7","value":"data"}
success:{"uniqid":"69276267323642245c4bde640ecb91.04877522","key":"key-8","value":"data"}
failure:{"uniqid":"83293267323642245c4bde640ed753.04622366","value":"data"}
success:{"uniqid":"28580267323642245c4bde640dd8f3.30292468","value":"data"}
success:{"uniqid":"10258267323642245c4bde640e1cd9.95656605","value":"data"}
success:{"uniqid":"43356267323642245c4bde640e88e9.50566706","value":"data"}
success:{"uniqid":"83293267323642245c4bde640ed753.04622366","value":"data"}
success:{"uniqid":"59823267323642245c4bde640e98b5.51512314","value":"data"}

我们看到消费者第一次执行时失败的消息，超时后又被弹回了消息队列，消费者有了再次执行的机会，监听者的职责就是确保消费者执行失败或挂掉后消息还能再弹回原队列得到再次执行

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转自：https://www.jmsite.cn/blog-615.html

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（编辑：李大同）

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