Question

我想使用Cloudformation创建一个S3存储桶，只要发生S3事件（例如文件创建，文件删除等）就会触发Lambda函数。

根据我的研究，我有AWS::Lambda::Function和AWS::S3::Bucket设置，

AWSTemplateFormatVersion: '2010-09-09'
Resources:
  HandleFileCreation: 
    Type: "AWS::Lambda::Function"
    Properties: 
      ...

  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      ManagedPolicyArns:
      - arn:aws:iam::aws:policy/AmazonS3FullAccess
      - arn:aws:iam::aws:policy/AWSLambdaFullAccess
      AssumeRolePolicyDocument:
        ...

  ReportsBucket:
    Type: AWS::S3::Bucket

  BucketPolicy:
    Type: AWS::S3::BucketPolicy
    Properties:
      Bucket: !Ref ReportsBucket
      PolicyDocument:
        ...

我正在查看AWS::Events::Rule，但示例仅适用于EC2，我无法找到S3的示例

  EventRule: 
    Type: "AWS::Events::Rule"
    Properties: 
      Description: "EventRule"
      EventPattern: 
        source: 
          - "aws.ec2"
        detail-type: 
          - "EC2 Instance State-change Notification"
        detail: 
          state: 
            - "stopping"
      State: "ENABLED"
      Targets: 
        - 
          Arn: 
            Fn::GetAtt: 
              - HandleFileCreation
              - Arn
          Id: TargetFunctionV1
  PermissionForEventsToInvokeLambda: 
    Type: AWS::Lambda::Permission
    Properties: 
      FunctionName: 
        Ref: HandleFileCreation
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn: 
        Fn::GetAtt: 
          - "EventRule"
          - "Arn"

如何编写模板以触发S3事件？

Answer 1

这是一个涵盖的例子，

http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-s3-bucket-notificationconfig-lambdaconfig.html

EncryptionServiceBucket:
  Type: "AWS::S3::Bucket"
  Properties:
    BucketName: !Sub ${User}-encryption-service
    NotificationConfiguration:
      LambdaConfigurations:
        -
          Function: !Ref LambdaDeploymentArn
          Event: "s3:ObjectCreated:*"
          Filter:
            S3Key:
              Rules:
                -
                  Name: suffix
                  Value: zip

我注意到的一个问题是，您需要在为其分配触发器之前创建该函数。如果您正在使用CF，请确保在为其创建触发器之前创建lambda函数。

希望它有所帮助。

Answer 2

我在使用Amazon Toolkit的Visual Studio示例项目之一中找到了答案：

(function f() { return 10; })()

Answer 3

我已经创建了以下代码，它正在与CloudFormation一起使用 ################################################ ######################### 每当发生S3事件时触发Lambda函数

  Type: AWS::S3::Bucket
  Properties:
    BucketName: !Sub '${EnvironmentNameShorthand}.product'
    NotificationConfiguration:
      LambdaConfigurations:
      - 
        Function: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:function name'
        Event: "s3:ObjectCreated:*"
        Filter:
          S3Key:
            Rules:
            - 
              Name: suffix
              Value: .json

LambdaInvokePermission:
  Type: AWS::Lambda::Permission
  Properties:
    FunctionName: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:function name '
    Action: "lambda:InvokeFunction"
    Principal: "s3.amazonaws.com"
    SourceArn: !Sub 'arn:aws:s3:::${EnvironmentNameShorthand}.product'

Answer 4

这是一个详细的答案（来自https://medium.com/@windix/s3-bucket-notification-to-lambda-in-cloudformation-without-circular-reference-f8f56ec5342c）

AWSTemplateFormatVersion: '2010-09-09'
Description: Example Stack

Parameters:
  BucketName:
    Type: String
    Default: unique-bucket-name

Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: !Ref BucketName
      ...
      NotificationConfiguration:
        LambdaConfigurations:
          - Event: 's3:ObjectCreated:*'
            Filter:
              S3Key:
                Rules:
                  - Name: prefix
                    Value: test/
                  - Name: suffix
                    Value: .txt
            Function: !GetAtt Lambda.Arn
  
  Lambda:
    Type: AWS::Lambda::Function
    ...

  S3InvokeLambdaPermission:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName: !Ref Lambda
      Principal: s3.amazonaws.com
      SourceArn: !Sub arn:aws:s3:::${BucketName}

  LambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service: lambda.amazonaws.com
          Action:
          - sts:AssumeRole
      Path: '/'
      Policies:
      - PolicyName: s3
        PolicyDocument:
          Statement:
          - Effect: Allow
            Action:
              - s3:Get*
            Resource:
              - !Sub arn:aws:s3:::${BucketName}
              - !Sub arn:aws:s3:::${BucketName}/*

用于在S3事件上触发Lambda的Cloudformation模板

4 个答案: