如何使用适配器更改 Axios 中的结果状态?

How can I change the result status in Axios with an adapter?

原因

我们正在使用 axios-retry 库,它在内部使用此代码:

axios.interceptors.response.use(null, error => {

因为它只指定错误回调,所以 Axios documentation 表示:

Any status codes that falls outside the range of 2xx cause this function to trigger

不幸的是,我们正在调用一个非RESTful API,它可以 return 200,正文中有一个错误代码,我们需要重试。

我们尝试在 axios-retry 之前添加一个 Axios 拦截器,并在这种情况下更改结果状态;但这并没有触发后续的拦截器错误回调。

所做的工作是指定自定义适配器。然而,这并没有得到很好的记录,我们的代码并没有处理所有情况。

密码

const axios = require('axios');
const httpAdapter = require('axios/lib/adapters/http');
const settle = require('axios/lib/core/settle');
const axiosRetry = require('axios-retry');

const myAdapter = async function(config) {
  return new Promise((resolve, reject) => {
    // Delegate to default http adapter
    return httpAdapter(config).then(result => {
      // We would have more logic here in the production code
      if (result.status === 200) result.status = 500;
      settle(resolve, reject, result);
      return result;
    });
  });
}

const axios2 = axios.create({
  adapter: myAdapter
});

function isErr(error) {
  console.log('retry checking response', error.response.status);
  return !error.response || (error.response.status === 500);
}

axiosRetry(axios2, {
  retries: 3,
  retryCondition: isErr
});

// httpstat.us can return various status codes for testing
axios2.get('http://httpstat.us/200')
  .then(result => {
    console.log('Result:', result.data);
  })
  .catch(e => console.error('Service returned', e.message));

这适用于错误情况,打印:

retry checking response 500
retry checking response 500
retry checking response 500
retry checking response 500
Service returned Request failed with status code 500

它在成功案例中也有效(将 URL 更改为 http://httpstat.us/201):

Result: { code: 201, description: 'Created' }

问题

将 URL 更改为 http://httpstat.us/404,但会导致:

(node:19759) UnhandledPromiseRejectionWarning: Error: Request failed with status code 404
    at createError (.../node_modules/axios/lib/core/createError.js:16:15)
    at settle (.../node_modules/axios/lib/core/settle.js:18:12)

httpAdapter 调用中的 catch 将捕获该错误,但我们如何将其传递到链中?

实现 Axios 适配器的正确方法是什么?

如果有更好的方法来处理这个问题(除了分叉 axios-retry 库),那将是一个可以接受的答案。

更新

一位同事发现在 httpAdapter 调用中执行 .catch(e => reject(e))(或只是 .catch(reject))似乎可以解决问题。但是,我们仍然希望有一个规范的示例来实现包装默认 http 适配器的 Axios 适配器。

这是有效的(在节点中):

const httpAdapter = require('axios/lib/adapters/http');
const settle = require('axios/lib/core/settle');

const customAdapter = config =>
  new Promise((resolve, reject) => {
    httpAdapter(config).then(response => {
      if (response.status === 200)
        // && response.data contains particular error
      {
        // log if desired
        response.status = 503;
      }
      settle(resolve, reject, response);
    }).catch(reject);
  });

// Then do axios.create() and pass { adapter: customAdapter }
// Now set up axios-retry and its retryCondition will be checked

拦截器和自定义错误的解决方法

const axios = require("axios").default;
const axiosRetry = require("axios-retry").default;

axios.interceptors.response.use(async (response) => {
  if (response.status == 200) {
    const err = new Error("I want to retry");
    err.config = response.config; // axios-retry using this
    throw err;
  }
  return response;
});

axiosRetry(axios, {
  retries: 1,
  retryCondition: (error) => {
    console.log("retryCondition");
    return false;
  },
});

axios
  .get("https://example.com/")
  .catch((err) => console.log(err.message)); // gonna be here anyway as we'll fail due to interceptor logic