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var ExBuffer = require('./ExBuffer');

/*************************基本操作****************************/

//构造一个ExBuffer，采用4个字节（uint32无符号整型）表示包长，而且是little endian 字节序
var exBuffer = new ExBuffer().uint32Head().littleEndian();
//或者构造一个ExBuffer，采用2个字节（ushort型）表示包长，而且是big endian 字节序 (默认)
var exBuffer = new ExBuffer().ushortHead().bigEndian();

//只要收到满足的包就会触发事件
exBuffer.on('data',function(buffer){
    console.log('>> receive data,length:'+buffer.length);
    //console.log(buffer);
});


//传入一个9字节长的数据，分多次put （对应于TCP中的分包的情况）
exBuffer.put(new Buffer([0,9]));
exBuffer.put(new Buffer([1,2,3,4,5,6,7]));
exBuffer.put(new Buffer([8,9]));

//传入一个3个字节的数据和一个6个字节的数据，一次put（对应于TCP中的粘包的情况）
exBuffer.put(new Buffer([0,3,1,2,3,0,6,1,2,3,4,5,6]));


//大数据处理测试 (20MB)
var exBuffer = new ExBuffer().uint32Head().bigEndian();
exBuffer.on('data',function(buffer){
    console.log('>> receive data,length:'+buffer.length);
    console.log(buffer);
});
var sbuf = new Buffer(4);
sbuf.writeUInt32BE(1024*1024*20,0);//写入包长
exBuffer.put(sbuf);
exBuffer.put(new Buffer(1024*1024*20));


/*************************在socket中的应用****************************/

console.log('-----------------------use in socket------------------------');

var net = require('net');

//测试服务端
var server = net.createServer(function(socket) {
  console.log('client connected');
  new Connection(socket);//有客户端连入时
});
server.listen(8124);

//服务端中映射客户端的类
function Connection(socket) {
    var exBuffer = new ExBuffer();
    exBuffer.on('data',onReceivePackData);

    socket.on('data', function(data) {
        exBuffer.put(data);//只要收到数据就往ExBuffer里面put
    });

    //当服务端收到完整的包时
    function onReceivePackData(buffer){
        console.log('>> server receive data,length:'+buffer.length);
        console.log(buffer.toString());

        var data = 'wellcom, I am server';
        var len = Buffer.byteLength(data);

        //写入2个字节表示本次包长
        var headBuf = new Buffer(2);
        headBuf.writeUInt16BE(len, 0)
        socket.write(headBuf);

        var bodyBuf = new Buffer(len);
        bodyBuf.write(data);
        socket.write(bodyBuf);
    }
}

//测试客户端
var exBuffer = new ExBuffer();
var client = net.connect(8124, function() {

  var data = 'hello I am client';
  var len = Buffer.byteLength(data);

  //写入2个字节表示本次包长
  var headBuf = new Buffer(2);
  headBuf.writeUInt16BE(len, 0)
  client.write(headBuf);

  var bodyBuf = new Buffer(len);
  bodyBuf.write(data);
  client.write(bodyBuf);
  
});

client.on('data', function(data) {
  exBuffer.put(data);//只要收到数据就往ExBuffer里面put
});

//当客户端收到完整的数据包时
exBuffer.on('data', function(buffer) {
    console.log('>> client receive data,length:'+buffer.length);
    console.log(buffer.toString());
});

npm install ExBuffer