express Hapi.js Restfy Koa app.listen() 和 app.get() 如何工作?

How express Hapi.js Restfy Koa app.listen() and app.get() work?

使用 http 节点模块(仅限本机模块)我如何重新创建 app.listen() 和 app.get() 使用带有构造函数的 http 模块

var app = function(opts) { 
     this.token= opts.token
 } 

 app.prototype.get = function(callback) {
     // use request and response of app.listen()
   }

  app.prototype.active = function(callback) {
  // use request and response of app.listen()
  // return on callback some manipulate 
  //request params
}


app.prototype.listen = function() {
 // start http or https server 
}

导入模块并使用它

var app = require(...)

Var client = new app({
token: 0000
})

client.get(function(error, reply) {})
client.listen()

在 Node 的 http 模块之上构建您自己的非常简单的 HTTP 框架非常容易。这是我制作的一个实现 app.get()app.listen() 方法的快速方法,您可以看到它如何成长为更像 Express 的东西:

'use strict';

const Http = require('http');
const Url = require('url');

// Framework

const Framework = function (options) {

    this.options = options;
    this.routes = [];
    this.listener = Http.createServer(this._onRequest.bind(this));
};

Framework.prototype.get = function (path, handler) {

    this.routes.push({ path, method: 'GET', handler });
};

Framework.prototype.post = function (path, handler) {

    this.routes.push({ path, method: 'POST', handler });
};

Framework.prototype.listen = function (callback) {

    this.listener.listen(this.options.port, callback);
};

Framework.prototype._onRequest = function (req, res) {

    // Find the first matching route

    for (let i = 0; i < this.routes.length; ++i) {
        const route = this.routes[i];
        const url = Url.parse(req.url);
        if (route.method === req.method && url.path === route.path) {
            return route.handler(req, res);
        }
    }

    // No matching routes

    res.writeHead(404);
    res.end('Not found');
};

您可以像这样使用这个迷你框架:

const app = new Framework({ port: 4000 });

app.get('/', (req, res) => {

    res.end('Home page');
});

app.get('/about', (req, res) => {

    res.end('About page');
});

app.listen(() => {

    console.log('Started server!');
});

您可以用几个 cURL 请求来测试它:

$ curl -i http://localhost:4000/

HTTP/1.1 200 OK
Date: Sun, 24 Apr 2016 14:38:02 GMT
Connection: keep-alive
Content-Length: 9

Home page

$ curl -i http://localhost:4000/about

HTTP/1.1 200 OK
Date: Sun, 24 Apr 2016 14:38:08 GMT
Connection: keep-alive
Content-Length: 10

About page

$ curl -i http://localhost:4000/spaghetti

HTTP/1.1 404 Not Found
Date: Sun, 24 Apr 2016 14:38:14 GMT
Connection: keep-alive
Transfer-Encoding: chunked

Not found

显然,这是一个非常基础的框架,并且存在许多像 hapi 这样的框架已经解决的问题:

  • 不支持路径中的参数,例如/users/{id}。 URL 路径必须与路由路径完全匹配
  • 添加路由的顺序很重要(这可能会导致问题)
  • 允许冲突路径
  • 缺少很多不错的功能,例如服务文件和呈现模板(尽管您可以在处理程序中手动执行此操作)