kafka-node+socket.io 测试配置

1.安装需要插件

npm install express

npm install socket.io

npm install kafka-node

2.kafkatest.js文件

var express = require('express');

var app = express();

var server = require('http').createServer(app);

var io = require('socket.io')(server);

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

var users = [];

app.use('/', express.static(__dirname + '/')); 

app.get('/send', function (req, res) {

    var msg=req.query.msg;

    var Producer = kafka.Producer,

    client = new kafka.Client('localhost:2181'),

    producer = new Producer(client);

    payloads = [

        { topic: 'test', messages: msg, partition: 0 },

    ];

    producer.on('ready', function(){

        producer.send(payloads, function(err, data){

            console.log(data);

           // socket.emit('server_counter',data);

        });

    });

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

    res.send('输入消息='+msg);

 })

server.listen(8080);

setTimeout(function(){

    var Consumer = kafka.Consumer;

    var Offset = kafka.Offset;

    var topic = 'test';

    var client = new kafka.Client('localhost:2181');//'localhost:2181'

    var topics = [{ topic: topic, partition: 0 }];

    var options = { autoCommit: false };//, fetchMaxWaitMs: 1000, fetchMaxBytes: 1024 * 1024

    var consumer = new Consumer(client, topics, options);

    var offset = new Offset(client);

    consumer.on('message', function (message) {

        console.log(message);

        io.sockets.emit('server_counter',message);

      });

      consumer.on('error', function (err) {

        console.log('error', err);

      });

      consumer.on('offsetOutOfRange', function (topic) {

        topic.maxNum = 2;

        offset.fetch([topic], function (err, offsets) {

          if (err) {

            return console.error(err);

          }

          var min = Math.min.apply(null, offsets[topic.topic][topic.partition]);

          consumer.setOffset(topic.topic, topic.partition, min);

        });

      });

},1000);

3.counter.html

<!DOCTYPE html>

<html>

<head>

    <title>socket</title>

</head>

<body>

<div style="margin: 0 auto;" id='msg'>

</div>

</body>

<script type="text/javascript" src="./node_modules/socket.io-client/dist/socket.io.js"></script>

<script type="text/javascript">

    var socket=io.connect('localhost:8080'),//与服务器进行连接

        send=document.getElementById('sendBtn'),

        leave=document.getElementById('leaveBtn');

    //接收来自服务端的信息事件

    socket.on('server_counter',function(msg){

        var div =document.createElement('div');

        div.innerHTML=JSON.stringify(msg);

       document.getElementById('msg').appendChild(div);

    })

</script>

</html>

3.效果展示

启动 kafkatest.js

打开http://localhost:8080/counter.html

打开http://localhost:8080/send?msg=谢大神你好

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kafka-node+socket.io 测试配置

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