小编cre*_*124的帖子

我在使用一些node.js代码时遇到了一些问题,我将其放入AWS Lambda.我需要做几个异步调用,虽然第一个是我期望的行为,但lambda函数在第二个调用完成之前终止.

返回值为null,这让我认为lambda正在触及它的隐式回调,但是我认为它不应该这样做,而有一个尚未解决的承诺.

码:

exports.handle = async function(event, context) {
  var AWS = require("aws-sdk");

  AWS.config.update({
    region: "eu-west-1",
    endpoint: "dynamodb.eu-west-1.amazonaws.com"
  });

  var docClient = new AWS.DynamoDB.DocumentClient();
  console.log("Scanning Catalogue...");

  var params = {
    TableName : "Catalogue"
  };

  await docClient.scan(params).promise().then(function (data) {
    console.log("Scan succeeded.");
    data.Items.forEach(function (item) {
      //console.log(item.url);
      checkIfUpdateRequired(item);
    })
  })
}

async function checkIfUpdateRequired (catalogueItem) {
  var request = require("request-promise");
  console.log("Getting " + catalogueItem.url);

  await request(catalogueItem.url).then(function(response) {
    console.log(response.statusCode);
    console.log(response.headers['content-type']);
  });

}

日志输出:

START RequestId: 634a55b7-6258-11e8-9f18-6b300c3b5de1 Version: $LATEST
2018-05-28T09:20:44.425Z    634a55b7-6258-11e8-9f18-6b300c3b5de1    Scanning Catalogue...
2018-05-28T09:20:45.446Z …