Node.js（2）-protobuf zeromq gzip

• 1、Node.Js环境准备

在win8 + vs.net 2012 环境下调试了很长时间没搞定安装编译问题，重装系统测试了2套环境，解决了编译问题：

1)Win8.1 + vs.net 2013

2) ubuntu server 64位

node.js 依赖库安装调试有点小麻烦，差点就放弃了，就以调试经验大概记录下来。

方案1）Win8.1  64位+ vs.net 2013

• 安装node.js

http://nodejs.org/download/

• vs.net 2013集成开发环境

http://nodejstools.codeplex.com/

• python 2.7 (注意版本，版本过高调试问题非常多）

Our Downloads | Python.org
https://www.python.org/downloads/

• 设置PATH环境变量

cmd 命令行：node –v 可以测试

方案2）ubuntu server 64位

sudo apt-get update
sudo apt-get install python-software-properties python g++ make
sudo add-apt-repository ppa:chris-lea/node.js
sudo apt-get update
sudo apt-get install nodejs

2.cnpm库安装

国内网络原因，npm安装插件容易出问题，使用cnpm解决。

npm install -g cnpm --registry=http://r.cnpmjs.org
cnpm install [name]

3.protobuf序列化

安装：

cnpm install protobufjs

官方API及介绍：

https://github.com/dcodeIO/ProtoBuf.js

示例google protobuf 描述proto文件：trace.proto

   1:  message Traces{

   2:      repeated Trace Items = 1;

   3:  }

   4:  message Trace {  

   5:          required    string code = 1;  

   6:      required    int32 tradeTime=2;

   7:      optional     double    amount=3;

   8:      optional     int64    volume=4;

   9:      optional     bool    buyOrSell=5;

  10:      optional     int64    deals=6;

  11:      optional     double    price=7;

  12:      enum Exchange

  13:      {        

  14:          Shse=1;

  15:           Szse=2;    

  16:      };

  17:      optional     Exchange    exchange=8;

  18:  }  

4.Zeromq通信

• 安装Zeromq

1、在http://www.zeromq.org/area:download页面下载最新的zeromq .
    wget http://download.zeromq.org/zeromq-XXXXX.tar.gz
2、安装相关软件
    $ sudo apt-get install libtool autoconf automake
    $ sudo apt-get install uuid-dev g++
    $ sudo apt-get install python-dev
3、编译安装zmq
    $ ./configure
    $ make
    $ sudo make install
    $ sudo ldconfig

• 安装zmq for node

cnpm install zmq

官方API介绍：

Node.js Binding - zeromq
http://zeromq.org/bindings:node-js

测试代码：

   1:  var protoBuf = require("protobufjs");

   2:  //protobufjs test

   3:  var builder  = protoBuf.loadProtoFile("trace.proto");

   4:  var     Rtquote =builder.build();

   5:   

   6:  var zlib = require('zlib');

   7:  var zmq = require('zmq');

   8:  var socket = zmq.socket('sub');

   9:  var port = "tcp://192.168.1.16:9178";

  10:  socket.identity = 'subscriber' + process.pid;

  11:  socket.connect(port);

  12:  console.log('connected!');

  13:   

  14:  socket.subscribe('Trace');

  15:   

  16:  var  i = 0;

  17:  socket.on('message', function(data) {

  18:       /*decode*/

  19:      var buf=data;

  20:          //console.log("packetType: " + buf.toString('utf8', 0, 26));

  21:            

  22:          //2.解压缩  自定义协议部分

  23:          var bodyBuffers = buf.slice(62,data.length);

  24:          //console.log("bodylength3:"+bodyBuffers.length);

  25:      

  26:          /*

  27:          if(bodyBuffers.length!=bodyLength)

  28:          {

  29:  

  30:              console.log(bodyBuffers.length+"!="+bodyLength);

  31:          }

  32:         */

  33:         

  34:          //body Gzip解压缩

  35:          zlib.gunzip(bodyBuffers,function(err, buffer) {

  36:            if (!err) {

  37:                  //console.log("gzip:"+buffer.length);

  38:                  var items =     Rtquote.Traces.decode(buffer);      

  39:                  //console.log("len:"+items.Items.length);    

  40:                  for(var i=0;i<items.Items.length;i++)

  41:               {

  42:                                  var item=items.Items[i];

  43:                                 console.log("code: "+item.code+" tradetime: "+item.tradeTime+" amount: "+item.amount+" volume: "+item.volume+" buyOrSell: "+item.buyOrSell+" deals: "+item.deals+" price: "+item.price+" exchange: "+item.exchange);

  44:               }                        

  45:            }

  46:      });

  47:  });

  48:   

  49:  console.log('Hello world');

运行：sudo node app.js 可以实时使用Zmq 接收数据，解压 ，序列化。

参考资料：

入门知识概览 · cnodejs/nodeclub Wiki · GitHub
https://github.com/cnodejs/nodeclub/wiki/%E5%85%A5%E9%97%A8%E7%9F%A5%E8%AF%86%E6%A6%82%E8%A7%88