Question

无法通过Lambda函数访问AWS DynamoDb。

Lambda函数：

'use strict';
const AWS = require('aws-sdk');
AWS.config.update({region: 'ap-southeast-2'});

const getUser = async function () {
    console.log('getUser() invoked');
    const documentClient = new AWS.DynamoDB.DocumentClient();
    const params = {
        TableName: 'Users',
        Key: {
          "UserId": "A001"
        }
    };
    console.log('params ', params);
    documentClient.get(params, function (err, data) {
        console.log('============>');
        if (err) {
            console.log('error ', err);
            return err;
        }
        console.log('success ', data);
        return data;
    });
};

exports.handler = async (event, context, callback) => {
    // TODO implement
    console.log('event ', event);
    const data = await getUser();
    console.log('=============> data ', data);
};

在测试Lambda函数时，正在打印的数据不确定。它是打印参数，而不是打印错误和成功。

Answer 1

您在这里对回调和Promise感到有些困惑，现在的方式是不将数据传递到外部。

const getUser = async function () {
  console.log('getUser() invoked');
  const documentClient = new AWS.DynamoDB.DocumentClient();
  const params = {
      TableName: 'Users',
      Key: {
        "UserId": "A001"
      }
  };
  console.log('params ', params);
  try {
    const data = await documentClient.get(params).promise();
    console.log('============>');
    console.log('success ', data);
    return data;
  } catch(err) {
    console.log('error ', err);
    throw err;
  }
};

to more about callback and promises check

无法从Lambda函数访问AWS DynamoDb

1 个答案: