app.js

const Koa = require('koa')
const app = new Koa()
const views = require('koa-views') // 能访问views下面的文件，渲染界面
const json = require('koa-json') // 参数转为json对象
const onerror = require('koa-onerror') // 错误监听
const bodyparser = require('koa-bodyparser') // 把前端请求参数转换
const logger = require('koa-logger')
const log4js = require('./utils/log4js')


const index = require('./routes/index')
const users = require('./routes/users')

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

app.use(views(__dirname + '/views', {
  extension: 'pug'
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  log4js.info(`log output`)
})

// routes
app.use(index.routes(), index.allowedMethods())
app.use(users.routes(), users.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  // console.error('server error', err, ctx)
  log4js.error(`${err.stack}`)
});

module.exports = app