kafka-node 实现生产者和消费者

生产者 producer.js

• 从代码我们可以看到 生产者每两秒生产一条数据
• 具体操作流程：
• 1.安装请参考其他文章
• 2.启动zk 启动kofka
• 3.安装第三方模块依赖 node install kafka-node
• 4. 执行脚本 node producer.js node consumer.js

/**
 * 生产者
 */

const kafka = require('kafka-node');

let conn = {'kafkaHost':'localhost:9092'};

var MQ = function (){
    this.mq_producers = {};
}

MQ.prototype.AddProducer = function (conn, handler){
    console.log('增加生产者',conn, this);
    let client = new kafka.KafkaClient(conn);
    /**
     * Producer(client, [options])
     * client: 和kafka服务保持连接的client对象
     * options：producer的属性
     */
    let producer = new kafka.Producer(client);

    producer.on('ready', function(){
        if(!!handler){
            handler(producer);
        }
    });

    producer.on('error', function(err){
        console.error('producer error ',err.stack);
    });

    this.mq_producers['common'] = producer;
    return producer;
}
console.log(MQ);
var mq = new MQ();

mq.AddProducer(conn, function (producer){
    producer.createTopics(['broadcast'], function (){
        setInterval(function(){
            mq.mq_producers['common'].send([{topic:['broadcast'], 
            messages:[JSON.stringify({"cmd":"testRpc","value":"Hello World"})]}], function (){
                console.log("..... ");
            })
        }, 2000);
    })
});

消费者 consumer.js

/**
 * 消费者
 */

const kafka = require('kafka-node');

let conn = {'kafkaHost':'127.0.0.1:9092'};
let consumers = [
    {
        'type': 'consumer',
        'options': {'autoCommit': true},
        'name':'common',
        'topic':[
            {'topic': 'broadcast', 'partition': 0}
        ]
    }
];

let MQ = function(){

}

MQ.prototype.AddConsumer = function (conn, topics, options, handler){
    let client = new kafka.KafkaClient(conn);
    let consumer = new kafka.Consumer(client, topics, options);

    if(!!handler){
        consumer.on('message', handler);
    }

    consumer.on('error', function(err){
        console.error('consumer error ',err.stack);
    });
}

var mq = new MQ();


mq.AddConsumer(conn, consumers[0].topic, consumers[0].options, function (message){
    console.log(message.value);
});