koa-standard.js

const Koa    = require('koa')
const Router = require('koa-router')
const runJob = require('./modules/job')
const log    = require('./modules/log')
const router = new Router()
const app    = new Koa()

router.get('/', async ctx => ctx.body = `PID ${process.pid} listening here!`)
      .post('/flip', async ctx => {
        const res = await runJob()
        ctx.body  = res
      })

app.use(async (ctx, next) => {
      await next();
      const rt = ctx.response.get('X-Response-Time');
      log(`${ctx.method} ${ctx.url} - ${rt}`);
    })
    .use(async (ctx, next) => {
      const start = Date.now();
      await next();
      const ms = Date.now() - start;
      ctx.set('X-Response-Time', `${ms}ms`);
    })
    .use(router.routes())
    .listen(3000)