javascript - 更新跨项目导出的对象

Question

我有以下与其他文件共享的对象

/实用程序/ token

module.exports = (function() {
  const cache = {
    access_token: 'jhkjfdhgkjhfkjmvbnmvcmgkjcvbnbfjhxvnm',
    expires_in: 2592000,
    token_type: 'Bearer'
  };
  return {
    get(key) {
      return cache[key];
    },
    set(key, val) {
      cache[key] = val;
    }
  };
}());

在其他文件中，我尝试使用 SET 方法更新对象

const router = require('express').Router();
const _ = require('lodash');

const config = require('../config');
const axios = require('axios');
const errors = require('../utils/errors');
const constants = require('../utils/constants');
const jwtTokenService = require('../utils/jwt-token-service');
const cache = require('../utils/jwtToken'); // imported up here

router.get('/', (req, res) => {

  const httpSearchAddressUXConfig = {
    headers: Object.assign(res._headers, {
      Authorization: `Bearer ${cache.get('access_token')}` // I am using get function to retrieve the value
    }),
    method: 'GET',
    url: 'http://getUser/12345',
    timeout: config.app.enterpriseHTTPTimeout
  };
  axios(httpSearchAddressUXConfig)
    .then((result) => {
      res.status(200).json(result);
    })
    .catch((err) => {
      const errorList = err.response.data.errorList;
      // res.status(401).json(errorList);
      _.forEach(errorList, (element) => {
        if (element.code === 'AUTH0007' || element.code === 'AUTH0003') {
          jwtTokenService.getJwtToken(req, res).then((data) => {
              cache.set('access_token', data.access_token); //updating the value up here
              return axios(httpSearchAddressUXConfig); 

// when I make this call it is taking the default value from the /utils/token through GET

            })
            .then(response => res.status(200).json(response))
            .catch((errResponse) => {
              res.status(401).json(errResponse.response.data.errorList);
            });
        }
      });
    });
});
module.exports = router;

上面的 SET 方法工作正常，但 cache.access_token 的值没有得到更新。所以每次我需要更新的 token 时我都需要进行一次设置调用。

我想在调用 SET 方法时更改 cache.access_token 的值，并在所有端点通过 GET 访问该值

const cache = {
  access_token: 'jhkjfdhgkjhfkjmvbnmvcmgkjcvbnbfjhxvnm', 
// need to change when ever SET is called.
  expires_in: 2592000,
  token_type: 'Bearer'
};

Answer 1

使用函数生成 axios 配置。您已经通过调用 cache.get('access_token') 创建了一次配置，使用相同的对象将不会再次调用 cache.get。使用这样的函数

function makeAxiosConfig(headers) {
  return {
    headers: Object.assign({}, headers, {
      Authorization: `Bearer ${cache.get('access_token')}`
    }),
    method: 'GET',
    url: 'http://getUser/12345',
    timeout: config.app.enterpriseHTTPTimeout
   }
}

// then inside you express middleware use it as follows
axios(makeAxiosConfig(res._headers)).then(() => {
  // do something
}).catch(ex => {
  // update token
  return axios(makeAxiosConfig(res._header);
});