使用AWS SAM时，无法测试引用DynamoDB表的本地Lambda

Question

我创建了“快速启动：Web后端”AWS SAM项目，其中包含一个使用SAM init SAM app的DynamoDB表。

按照自述文件中的说明，当我尝试构建并调用引用Dynamo表的lambda函数时：

sam build
sam local invoke getAllItemsFunction --event events/event-get-all-items.json

我得到一个未找到请求的资源错误：

Invoking src/handlers/get-all-items.getAllItemsHandler (nodejs12.x)

Fetching lambci/lambda:nodejs12.x Docker container image......
Mounting /Users/dev/lab/sam-app/.aws-sam/build/getAllItemsFunction as /var/task:ro,delegated inside runtime container
START RequestId: bd1dd37e-d464-13c1-45da-a4d427db1e84 Version: $LATEST
2020-07-12T23:33:50.674Z    bd1dd37e-d464-13c1-45da-a4d427db1e84    INFO    received: { httpMethod: 'GET' }
2020-07-12T23:33:50.812Z    bd1dd37e-d464-13c1-45da-a4d427db1e84    ERROR   Invoke Error    {"errorType":"ResourceNotFoundException","errorMessage":"Requested resource not found","code":"ResourceNotFoundException","message":"Requested resource not found","time":"2020-07-12T23:33:50.809Z","requestId":"E711QAGJJAH7FDFSIU8PR88053VV4KQNSO5AEMVJF66Q9ASUAAJG","statusCode":400,"retryable":false,"retryDelay":26.07018253857256,"stack":["ResourceNotFoundException: Requested resource not found","    at Request.extractError (/var/task/node_modules/aws-sdk/lib/protocol/json.js:51:27)","    at Request.callListeners (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:106:20)","    at Request.emit (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:78:10)","    at Request.emit (/var/task/node_modules/aws-sdk/lib/request.js:688:14)","    at Request.transition (/var/task/node_modules/aws-sdk/lib/request.js:22:10)","    at AcceptorStateMachine.runTo (/var/task/node_modules/aws-sdk/lib/state_machine.js:14:12)","    at /var/task/node_modules/aws-sdk/lib/state_machine.js:26:10","    at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:38:9)","    at Request.<anonymous> (/var/task/node_modules/aws-sdk/lib/request.js:690:12)","    at Request.callListeners (/var/task/node_modules/aws-sdk/lib/sequential_executor.js:116:18)"]}

示例项目包含3个lambda函数，它们调用DynamoDb后端（为清晰起见进行了修剪）：

AWSTemplateFormatVersion: 2010-09-09
Description: >-
  sam-ap

Transform:
- AWS::Serverless-2016-10-31

Resources:
  getAllItemsFunction:
    Type: AWS::Serverless::Function
    Properties:
      Handler: src/handlers/get-all-items.getAllItemsHandler
      Runtime: nodejs12.x
      MemorySize: 128
      Timeout: 100
      Description: A simple example includes a HTTP get method to get all items from a DynamoDB table.
      Policies:
        # Give Create/Read/Update/Delete Permissions to the SampleTable
        - DynamoDBCrudPolicy:
            TableName: !Ref SampleTable
      Environment:
        Variables:
          # Make table name accessible as environment variable from function code during execution
          SAMPLE_TABLE: !Ref SampleTable
      Events:
        Api:
          Type: Api
          Properties:
            Path: /
            Method: GET

  SampleTable:
    Type: AWS::Serverless::SimpleTable
    Properties:
      PrimaryKey:
        Name: id
        Type: String
      ProvisionedThroughput:
        ReadCapacityUnits: 2
        WriteCapacityUnits: 2

Outputs:
  WebEndpoint:
    Description: "API Gateway endpoint URL for Prod stage"
    Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/"

我的假设是DynamoDB表不是在AWS测试docker容器中本地创建的。在本地测试DynamoDB时，是否还缺少其他构建步骤或其他定义文件？

Answer 1

我的假设是DynamoDB表不是在AWS测试docker容器中本地创建的。在本地测试DynamoDB时，是否还缺少其他构建步骤或其他定义文件？

sam本地调用仅用于在本地调用lambda函数，而不是创建本地DynamoDb。

本地DynamoDb应该手动设置，例如使用docker映像或java：

• 安装DynamoDB Docker映像
• 在计算机上本地部署DynamoDB

如何使用您的本地函数与本地DynamoDb显示在AWS博客文章和其他资源，例如：

• 新增–AWS SAM本地版（测试版）–本地构建和测试无服务器应用程序