Laravel中Kafka的使用详解

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这篇文章主要介绍了Laravel中Kafka的使用详解，kafka是一个分布式消息队列，具有高性能、持久化、多副本备份、横向扩展能力，有对于消息队列感兴趣的同学可以参考下                        
本文并没有kafka的安装教程,本文是针对已经安装kafka及其配置好kafka的php拓展并且使用laravel框架进行开发项目,配置一个可供laravel框架使用的生产及消费者类.
以下代码修改自本站的YII框架关于kafka类的代码,经过测试使用在本人的项目中,可正常运行,larvael版本:5.6 代码放置larvael框架位置:app/Tools/Kafka.php

<?php
namespace App\Tools;
 
use Illuminate\Config\Repository;
 
use Illuminate\Support\Facades\DB;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
 
use Illuminate\Http\Request;
 
class Kafka
{
  public $broker_list = '127.0.0.1';//配置kafka，可以用逗号隔开多个kafka
  public $topic = 'test';//管道名称
  public $partition = 0;
 
  protected $producer = null;
  protected $consumer = null;
 
  public function __construct()
  {
  if (empty($this->broker_list)) {
    throw new InvalidConfigException("broker not config");
  }
  $rk = new \RdKafka\Producer();
  if (empty($rk)) {
    throw new InvalidConfigException("producer error");
  }
  $rk->setLogLevel(LOG_DEBUG);
  if (!$rk->addBrokers($this->broker_list)) {
    throw new InvalidConfigException("producer error");
  }
  $this->producer = $rk;
  }
 
  /**
   * 生产者
   * @param array $messages
   * @return mixed
   */
  public function send($messages = [],$topic)
  {
  $topic = $this->producer->newTopic($topic);
  return $topic->produce(RD_KAFKA_PARTITION_UA, $this->partition, json_encode($messages));
  }
 
  /**
   * 消费者
   */
  public function consumer($object, $callback){
  $conf = new \RdKafka\Conf();
  $conf->set('group.id', 0);
  $conf->set('metadata.broker.list', $this->broker_list);
 
  $topicConf = new \RdKafka\TopicConf();
  $topicConf->set('auto.offset.reset', 'smallest');
 
  $conf->setDefaultTopicConf($topicConf);
 
  $consumer = new \RdKafka\KafkaConsumer($conf);
 
  $consumer->subscribe([$this->topic]);
 
  echo "waiting for messages.....\n";
  while(true) {
    $message = $consumer->consume(120*1000);
    switch ($message->err) {
    case RD_KAFKA_RESP_ERR_NO_ERROR:
      echo "message payload....";
      $object->$callback($message->payload);
      break;
    }
    sleep(1);
  }
  }
}
?>

在控制器中如何使用:
首先再头部导入这个类:use App\Tools\Kafka;
下面是使用生产者实例:

public function test(){
 
   $topic = 'tool';//输入使用管道名称
   $data['shop_id'] = 58;
   $data['bar_code']=586;
   $data['goods_num'] = 1;
   $data['goods_unit'] = '个';
 
$Kafka = new Kafka();
$Error_Msg = $Kafka->send($data,$topic);//传入数组会自动转换json
var_dump($Error_Msg);
 
 
  }

下面是消费者实例,消费者我这里使用了的是php脚本进行的操作:

<?php
 
$conf = new RdKafka\Conf();
 
$conf->set('group.id', 'myConsumerGroup');
 
$rk = new RdKafka\Consumer($conf);
$rk->addBrokers("localhost:9092");
 
$topicConf = new RdKafka\TopicConf();
$topicConf->set('auto.commit.interval.ms', 100);
$topicConf->set('offset.store.method', 'file');
$topicConf->set('offset.store.path', sys_get_temp_dir());
$topicConf->set('auto.offset.reset', 'smallest');
 
$topic = $rk->newTopic("tool", $topicConf);//读取的管道
 
// Start consuming partition 0
$topic->consumeStart(0, RD_KAFKA_OFFSET_STORED);
 
while (true) {
  $message = $topic->consume(0, 120*10000);
  switch ($message->err) {
  case RD_KAFKA_RESP_ERR_NO_ERROR:
  //没有错误打印信息
    $message = json_decode(json_encode($message),true);
    $data = json_decode($message['payload'],true);
    var_dump($data);
    break;
  case RD_KAFKA_RESP_ERR__PARTITION_EOF:
    echo "等待接收信息\n";
    break;
  case RD_KAFKA_RESP_ERR__TIMED_OUT:
    echo "超时\n";
    break;
  default:
    throw new \Exception($message->errstr(), $message->err);
    break;
  }
 sleep(1);
}
 
?>

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