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lzh_koa.js
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lzh_koa.js
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const http = require('http')
const context = require('./context')
const request = require('./request')
const response = require('./response')
class LZH_KOA {
// init midllewares array
constructor() {
this.middlewares = []
}
listen(...args) {
const server = http.createServer(async (req, res) => {
//
const ctx = this.createContext(req, res)
// this.callback(ctx)
const fn = this.compose(this.middlewares)
await fn(ctx)
res.end(ctx.body)
// this.callback(req, res)
})
server.listen(...args)
}
use(middlewares) {
this.middlewares.push(middlewares)
}
// 构建上下文
createContext(req, res) {
const ctx = Object.create(context)
ctx.request = Object.create(request)
ctx.response = Object.create(response)
ctx.req = ctx.request.req = req
ctx.res = ctx.response.res = res
return ctx
}
// 合成函数
compose(middlewares) {
return function (ctx) {
return dispatch(0);
// 执行第0个
function dispatch(i) {
let fn = middlewares[i];
if (!fn) {
return Promise.resolve();
}
return Promise.resolve(fn(ctx, function next() {
// promise完成后,再执行下一个
return dispatch(i + 1);
})
);
}
};
}
}
module.exports = LZH_KOA