Question

好的，我正在尝试将Dynamo DB表名作为参数发送。我已经定义了以下Lambda：

'use strict';

const AWS = require('aws-sdk');
const DOC = require('dynamodb-doc');
const docClient = new AWS.DynamoDB.DocumentClient({ region: 'eu-west-1' });

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

// Set local variables to passed in variables 
var dynamoDBReadFromTableName = event.dynamoDBReadFromTableName;
var dynamoDBReadFromPrimaryKeyValue = event.dynamoDBReadFromPrimaryKeyValue;
var dynamoDBTablePrimaryKeyName = event.dynamoDBTablePrimaryKeyName;

// Read MCP SKU data from MCPSKU-CustomsPartKey
// Create the Parameters that are used by the GET call
let dynamoDBTableReadFromParameters = {
    TableName: dynamoDBReadFromTableName,
    Key: {
        dynamoDBTablePrimaryKeyName: dynamoDBReadFromPrimaryKeyValue
    },
    AttributesToGet: [
        'CustomsPartKey',
        'EffectiveDateCountryOfOrigin',
        'ItemWeightLbs'
    ],
};
//Use the GET call  to read the MCP SKU data
docClient.get(dynamoDBTableReadFromParameters, function(err, dataReadFromDynamoDbtable) {
        if (err) {
            console.log(err, err.stack);
        } else {
            console.log(dataReadFromDynamoDbtable)
        }
    });
};

我在没有传递AWS Dynamo DB表名的情况下测试了这一点 - 即dynamoDBTablePrimaryKeyName并且已经过了 "footer": dynamoDBReadFromPrimaryKeyValue foobar实际上是一个Dynamo DB名称，它只是花花公子。

当我尝试使用参数（具有相同/正确的名称）替换Dynamo DB名称时，出现以下错误：

START RequestId: 835fa87b-fdde-11e6-9b5d-a35457d4e835 Version: $LATEST
2017-02-28T17:51:21.575Z    835fa87b-fdde-11e6-9b5d-a35457d4e835    { [ValidationException: The provided key element does not match the schema]
  message: 'The provided key element does not match the schema',
  code: 'ValidationException',
  time: Tue Feb 28 2017 17:51:21 GMT+0000 (UTC),
  requestId: 'T37SQIF62TFUFCQUMJM7DL4AJBVV4KQNSO5AEMVJF66Q9ASUAAJG',
  statusCode: 400,
  retryable: false,
  retryDelay: 0 } 'ValidationException: The provided key element does not match the schema
    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:43:27)
    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:77:10)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:671:14)
    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)
    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:673:12)
    at Request.callListeners (/var/runtime/node_modules/aws-  sdk/lib/sequential_executor.js:115:18)'
END RequestId: 835fa87b-fdde-11e6-9b5d-a35457d4e835
REPORT RequestId: 835fa87b-fdde-11e6-9b5d-a35457d4e835  Duration: 236.73 ms Billed Duration: 300 ms     Memory Size: 512 MB Max Memory Used: 30 MB

有人有想法吗？ AWS Lambda是否不允许传递表名？

Answer 1

啊......我基本上是个蠢蛋。我想到了。（1）表传递没有失败，将主要Ket名称分配给主键值。（2）我用它修好了 var key = {}; key [dynamoDBTablePrimaryKeyName] = dynamoDBReadFromPrimaryKeyValue;

如何将Dynamo DB表名传递给AWS Lambda函数？

1 个答案: