import * as Koa from 'koa';

import * as views from 'koa-views';

import * as convert from 'koa-convert';

import * as json from 'koa-json';

import * as koaBodyparser from 'koa-bodyparser';

import * as logger from 'koa-logger';

import * as cors from 'koa-cors';

import webRouter from './routes';

//log工具

import logUtil from './utils/log_util';

import response_formatter from './middlewares/response_formatter';

const app = new Koa();

const bodyparser = koaBodyparser();

// middlewares

app.use(cors());

app.use(convert(bodyparser));

app.use(convert(json()));

app.use(convert(logger()));

app.use(convert(require('koa-static')(__dirname + '/public')));

app.use(views(__dirname + '/views', {

extension: 'jade'

}));

// logger

app.use(async (ctx, next) => {

//响应开始时间

const start = new Date();

//响应间隔时间

let ms: any = null;

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);

}

});

//添加格式化处理响应结果的中间件，在添加路由之前调用

//仅对/api开头的url进行格式化处理

app.use(response_formatter('^/api'));

app.use(webRouter.routes());

// response

app.on('error', (err, ctx) => {

console.log(err);

logger.error('server error', err, ctx);

});

module.exports = app;