phpkafka使用

一、安装以及使用shell命令终端操作kafka
环境配置
1、下载最新版本的kafka： kafka_2.11-1.0.0.tgz
http://mirrors.shu.edu.cn/apache/kafka/1.0.0/kafka_2.11-1.0.0.tgz

2、配置,解压后进入config目录
2.1、配置zookeeper.properties
默认监听端口2181

2.2、配置server.properties
开启监听端口，比如监听本地
listeners=PLAINTEXT://10.168.1.99:9092

3、启动
3.1、启动zookeeper
./bin/zookeeper-server-start.sh config/zookeeper.properties

3.2、启动server
./bin/kafka-server-start.sh config/server.properties

此处启动server时报错内存不足，解决方案要么加大系统内存，要么调小kafka需求内存
我这是调小kafka启动所需内存大小
vim kafka-server-start.sh
把其中:export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
改为：export KAFKA_HEAP_OPTS="-Xmx512M -Xms512M"

4、启动测试的消费者，并监听topic的test
./bin/kafka-console-consumer.sh --zookeeper 10.168.1.99:2181 --topic test --from-beginning

5、启动测试的生产者，并监听topic的test
./bin/kafka-console-producer.sh --broker-list 10.168.1.99:9092 --topic test

此时，在生产者中输入数据后回车后，在消费者终端可以看到生产者产生的信息

二、使用PHP操作kafka

1、安装kafka的扩展php-rdkafka
1.1、在安装php-rdkafka之前，需要先安装librdkafka
git clone https://github.com/edenhill/librdkafka.git
./configure
make && make install

1.2、安装php-rdkafka
git clone https://github.com/arnaud-lb/php-rdkafka.git
cd php-rdkafka
phpize
./configure
make && make install

2、编写kafka生产者和消费者类

<?php
/**
 * Kafka.php.
 * User: lvfk
 * Date: 2018/2/7 0007
 * Time: 11:04
 * Desc: Kafka服务
 */

namespace app\models;


use yii\base\InvalidConfigException;

class Kafka
{
    public $broker_list = '10.168.1.99:9092';//配置kafka，可以用逗号隔开多个kafka
    public $topic = 'topic';
    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 = $this->producer->newTopic($this->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);
        }
    }
}

3、配置

//配置kafka生产者
'asyncLog' => [
    'class' => '\\app\\models\\Kafka',
    'broker_list' => '10.168.1.99:9092',
    'topic' => 'asynclog'
]

4、在业务代码中生产消息
\Yii::$app->asyncLog->send(['this is IndexController,'.date('y-md H:i:s',time())]);

5、在yii的command中消费

5.1、编写KafkaController.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace app\commands;

use yii\console\Controller;

/**
 * This command echoes the first argument that you have entered.
 *
 * This command is provided as an example for you to learn how to create console commands.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class KafkaController extends Controller
{
    /**
     * This command echoes what you have entered as the message.
     * @param string $message the message to be echoed.
     */
    public function actionConsume()
    {
        \Yii::$app->asyncLog->consumer($this, 'callback');

    }

    public function callback($message)
    {
        \Yii::info($message, 'testkafka');
        \Yii::$app->log->setflushInterval(1);
    }

}

5.2、运行:
./yii kafka/consume


6、当第4步中生产数据后，在第5步的终端可以消费数据

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