从 aws lambda 调用外部 API 并在 lambda 函数中获取响应作为回调

Question

我正在尝试使用节点请求模块在 aws Lambda 函数中调用外部 API。到目前为止，我已成功调用 API 并在 lambda 执行中获取数据。我遇到的唯一问题是使用 response.even 获取我的 userInfo 数据我的 userInfo 有数据在客户端给我空对象

var AWS = require('aws-sdk');
AWS.config.region = 'us-east-1';
var request = require('request');
const encode = require('nodejs-base64-encode');
var lambda = new AWS.Lambda();
import { Handler, Context, Callback } from "aws-lambda";
import { PayPalLinkDetails } from "../../View/PayPalLinkDetails";
import { PayPalLinkResponse, PayPalLinkResponseBody } from "../../View/PayPalLinkResponseBody";

const PAYPAL_CLIENT = process.env.PayPalClientID;
const PAYPAL_SECRET = process.env.PayPalSecretKEY;
const PAYPAL_OAUTH_API = process.env.PayPalAuthAPI;
const PAYPAL_IDENTITY_API = process.env.PayPalIdentityAPI;

const LinkPayPal: Handler = async (paypalRequest : PayPalLinkDetails, context: Context, callback: Callback) => {

    var userInfo = new PayPalLinkResponse();     
    var paypalresponse = new PayPalLinkResponseBody();
    const basicAuth = encode.encode(PAYPAL_CLIENT+":"+PAYPAL_SECRET, 'base64');      
      var options = {
        'method': 'POST',
        'url': PAYPAL_OAUTH_API,
        'headers': {
          'Authorization': 'Basic '+basicAuth,
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        form: {
          'grant_type': 'authorization_code',
          'code': paypalRequest.code
        }
      };

      await request(options, async function (error : any, response :any) { 
        if (error)
        {
           console.log(error);
        }
        else
        {
            paypalresponse = response.body;
           // save data to DB here
        }

      });

      var getIdentity = {'method': 'get','url': PAYPAL_IDENTITY_API,'headers': {'Authorization': 'Basic '+basicAuth,'Content-Type': 'application/x-www-form-urlencoded'},form: {'grant_type': 'authorization_code','code': paypalresponse.access_token}};

       await request(getIdentity, function (err : any, res :any)
                                {
                                    if (err)
                                    {
                                        console.log(err);
                                    }
                                    else
                                    {        
                                        userInfo = res.body; // this Print the values as expected
                                        console.log(userInfo);

                                    }
                                });


 callback(null,userInfo); // This Giving me Empty value      
}

export {LinkPayPal}

我想我调用回调的方式不对。有什么解决这个问题的建议吗..?

Answer 1

问题是您混淆了回调和 async/await 样式，这不会像您期望的那样工作。您在这里有几个选择

[不推荐]: 做一个嵌套的回调，在第一个回调的响应上，调用第二个请求等等。
[不推荐]：使用名为 request-promise 的请求包的 promise 版本，因为它现在已被弃用。
[不推荐]：将请求的回调样式转换为基于承诺的回调方式。 request 模块再次被弃用。有关详细信息，请参阅 here。
[推荐]：使用一些支持开箱即用并得到适当维护的现代软件包。比如got、axios等。可以看到列表here.

如果您使用 got pacakge 进行 http 调用，代码将是这样的。

var AWS = require("aws-sdk");
AWS.config.region = "us-east-1";
var got = require("got");
const encode = require("nodejs-base64-encode");
var lambda = new AWS.Lambda();
import { Handler, Context, Callback } from "aws-lambda";
import { PayPalLinkDetails } from "../../View/PayPalLinkDetails";
import {
  PayPalLinkResponse,
  PayPalLinkResponseBody
} from "../../View/PayPalLinkResponseBody";

const PAYPAL_CLIENT = process.env.PayPalClientID;
const PAYPAL_SECRET = process.env.PayPalSecretKEY;
const PAYPAL_OAUTH_API = process.env.PayPalAuthAPI;
const PAYPAL_IDENTITY_API = process.env.PayPalIdentityAPI;

const LinkPayPal: Handler = async (
  paypalRequest: PayPalLinkDetails,
  context: Context,
  callback: Callback
) => {
  var userInfo = new PayPalLinkResponse();
  var paypalresponse = new PayPalLinkResponseBody();
  const basicAuth = encode.encode(
    PAYPAL_CLIENT + ":" + PAYPAL_SECRET,
    "base64"
  );
  var options = {
    method: "POST",
    url: PAYPAL_OAUTH_API,
    headers: {
      Authorization: "Basic " + basicAuth,
      "Content-Type": "application/x-www-form-urlencoded"
    },
    form: {
      grant_type: "authorization_code",
      code: paypalRequest.code
    }
  };

  const paypalresponse = await got(options);

  var getIdentity = {
    method: "get",
    url: PAYPAL_IDENTITY_API,
    headers: {
      Authorization: "Basic " + basicAuth,
      "Content-Type": "application/x-www-form-urlencoded"
    },
    form: {
      grant_type: "authorization_code",
      code: paypalresponse.access_token
    }
  };

  const userInfo = await got(getIdentity);

  return userInfo;
};

export { LinkPayPal };

您可能需要根据 got 样式调整选项，但您会明白的。

从 aws lambda 调用外部 API 并在 lambda 函数中获取响应作为回调

call external API from aws lambda and get respose as callback in lambda funtion

node.js

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http-post

nodejs-server