amazon-web-services - AWS SAM - 资源之间的循环依赖错误

Question

我关注了这个tutorial设置一个 AWS Lambda 函数，该函数在上传到 S3 时调用并填充 DynamoDB。

我正在尝试通过 AWS SAM 实现同样的目标为此，我需要定义一个包含配置信息的 template.yaml 文件。使用 Cloudformation 进行部署时，我不断收到此错误 -

Failed to create the changeset: Waiter ChangeSetCreateComplete failed: Waiter encountered a terminal failure state Status: FAILED. Reason: Circular dependency between resources: [LambdaPerm]

我找不到很多这方面的信息，所以我正在努力调试。是什么原因导致此错误以及如何解决此问题？这是我的模板配置 -

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Resources:
  Gradebook:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: LambdaGradebookServerless
      Handler: serverless.LambdaGradebook
      Runtime: java8
      CodeUri: ./target/serverless-0.0.1-SNAPSHOT.jar
      Role: arn:aws:iam::xxxxxxxxxxxx:role/lambda-s3-execution-role
  LambdaPerm:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName:
        Ref: Gradebook
      Principal: s3.amazonaws.com
      SourceAccount:
        Ref: AWS::xxxxxxxxxxxx
      SourceArn:
        Fn::Join:
        - ':'
        - - arn
          - aws
          - s3
          - ''
          - ''
          - Ref: gradebookBucket
  gradebookBucket:
    Type: AWS::S3::Bucket
    Properties:
      Bucket: gradebook-lambda
      NotificationConfiguration:
        LambdaConfigurations:
        - Event: s3:ObjectCreated:*
          Function:
            Ref: Gradebook

Answer 1

为了避免这种循环依赖，请独立创建 S3 存储桶和 Lambda 函数，然后使用 S3 notification configuration 更新堆栈。 .