text: const mount = require('koa-mount');
  const app = new (require('koa'));
  const rpcClient = require('./client');
  const template = require('../utils/template');
  
  const detailTemplate = template(__dirname + '/template/index.html');
  
  app.use(async (ctx) => {
    if (!ctx.query.columnid) {
      // ctx.status = 400;
      // ctx.body = 'invalid columnid';
      ctx.redirect('/detail?columnid=1');
      return;
    }
  
    const result = await new Promise((resolve, reject) => {
      rpcClient.write({
        columnid: ctx.query.columnid
      }, function (err, data) {
        err ? reject(err) : resolve(data)
      })
    });
  
    ctx.status = 200;
    ctx.body = detailTemplate(result);
  })
  
  module.exports = app;
  