node.js - 无法读取exports.handler处未定义的属性 '0'(/var/task/index.js :4:34)

Question

我创建了一个 Lambda 函数，当我尝试执行该函数时抛出错误

'use strict';

exports.handler = (event, context, callback) => {

  const request = event.Records[0].cf.request;
  const headers = request.headers;
  const origin = request.origin;
  const client_IP = request.clientIp;
  console.log(JSON.stringify(event));

  //Setup the two different origins
  const originA = "cloudfront-S3-origin1";
  const originB = "Cloudfront-S3-origin2";
  if (client_IP == "xx.xx.xx.xx") {
    origin.s3.domainName = originA;
  } else {
    origin.s3.domainName = originB;
  }
  callback(null, request);
};

Answer 1

您的 Lambda 函数要么通过手动触发，要么以某种方式错过了 event.Records。我想建议您在使用类似

之前检查可用数据

'use strict';

exports.handler = (event, context, callback) => {
  if(!event.Records) {
    return callback(new Error('Records not available'));
  }

  const request = event.Records[0].cf.request;
  const headers = request.headers;
  const origin = request.origin;
  const client_IP = request.clientIp;
  console.log(JSON.stringify(event));

  //Setup the two different origins
  const originA = "cloudfront-S3-origin1";
  const originB = "Cloudfront-S3-origin2";
  if (client_IP == "xx.xx.xx.xx") {
    origin.s3.domainName = originA;
  } else {
    origin.s3.domainName = originB;
  }
  callback(null, request);
};