Middl 介绍
Middl 是采用JS编写的通用中间件。
安装
npm install --save middl
模块使用：
const middl = require('middl');
const app = middl();
// a sync middleware
app.use((input, output) => {
output.prop = 1;
});
// an async middleware
app.use((input, output) => {
// Faking a time consuming task...
return new Promise(resolve => {
setTimeout(() => {
output.prop += 1;
resolve();
}, 10);
});
});
// a time measuring logger:
app.use((input, output) => {
var start = new Date();
next()
.then(() => {
var ms = new Date() - start;
console.log('Done in %s ms', ms);
});
});
// or even prettier with generator functions:
app.use(function *(input, output) {
var start = new Date();
yield next();
var ms = new Date() - start;
console.log('Done in %s ms', ms);
});
// or when using Babel and async/await:
app.use(async (input, output) => {
var start = new Date();
await next();
var ms = new Date() - start;
console.log('Done in %s ms', ms);
});
// pass in the initial `input` and `output` objects
// and run the middleware stack:
app.run({val: 'hello'}, {})
.then(output => {
// output.prop === 2
});
示例代码：
const http = require('http');
const middl = require('middl');
// Make middl more Express like by using `url` as the property to match paths with:
const app = middl({pathProperty: 'url'});
// Adding all app.METHOD() functions à la Express:
http.METHODS.forEach(method => {
app[method.toLowerCase()] = app.match({method});
});
// Also the app.all():
app.all = (path, fn) => {
http.METHODS.forEach(method => {
app[method.toLowerCase()](path, fn);
});
return app;
};
// A route handler for requests to: GET /test
app.get('/test', (req, res) => {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('ok\n');
});
// A route handler for requests to: POST /test
app.post('/test', (req, res) => {
res.writeHead(202, {'Content-Type': 'text/plain'});
res.end('accepted\n');
});
// Make the middle app web server listen on port 3000:
http.createServer(app).listen(3000);
Middl 官网
https://github.com/joakimbeng/middl
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