app.js

const Koa = require('koa')
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')
const static = require('koa-static')
const logUtil = require('./middleware/log4js');

const index = require('./routes/index')
// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))

app.use(json())
app.use(logger())
app.use(static(__dirname + '/public'))

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

// logger
app.use(async (ctx, next) => {
  //响应开始时间
  const start = new Date();
  //响应间隔时间
  var ms;
  try {
    //开始进入到下一个中间件
    await next();

    ms = new Date() - start;
    //记录响应日志
    logUtil.logResponse(ctx, ms);

  } catch (error) {
    
    ms = new Date() - start;
    //记录异常日志
    logUtil.logError(ctx, error, ms);
  }
})

// routes
app.use(index.routes(), index.allowedMethods())
module.exports = app