/
**
* Created by BIYY on 2018-6-14. */function App() {
if (!(this instanceof App))
return new App();
this.init();
}
App.prototype = {
constructor: App,
init: function() {
this.request = { //模拟的request
requestLine: ‘POST /iven_ HTTP/1.1’,
headers: ‘Host:www.baidu.com\r\nCookie:BAIDUID=E063E9B2690116090FE24E01ACDDF4AD:FG=1;BD_HOME=0’,
requestBody: ‘key1=value1&key2=value2&key3=value3’,
};
this.response = {}; //模拟的response
this.chain = []; //存放中间件的一个数组
this.index = 0; //当前执行的中间件在chain中的位置
},
use: function(handle) { //这里默认 handle 是函数，并且这里不做判断
this.chain.push(handle);
},
next: function() { //当调用next时执行index所指向的中间件
if (this.index >= this.chain.length)
return;
let middleware = this.chain[this.index];
this.index++;
middleware(this.request, this.response, this.next.bind(this));
},
}
function lineParser(req, res, next) {
let items = req.requestLine.split(’ ');
req.methond = items[0];
req.url = items[1];
req.version = items[2];
next(); //执行下一个中间件
}
function headersParser(req, res, next) {
let items = req.headers.split(’\r\n’);
let header = {}
for(let i in items) {
let item = items[i].split(’:’);
let key = item[0];
let value = item[1];
header[key] = value;
}
req.header = header;
next(); //执行下一个中间件
}
function bodyParser(req, res, next) {
let bodyStr = req.requestBody;
let body = {};
let items = bodyStr.split(’&’);
for(let i in items) {
let item = items[i].split(’=’);
let key = item[0];
let value = item[1];
body[key] = value;
}
req.body = body;
next(); //执行下一个中间件
}
function middleware3(req, res, next) {
console.log('url: '+req.url);
console.log('methond: '+req.methond);
console.log('version: '+req.version);
console.log(req.body);
console.log(req.header);
next(); //执行下一个中间件
}
let app = App();
app.use(lineParser);
app.use(headersParser);
app.use(bodyParser);
app.use(middleware3);
app.next();