Cloudformation模板在S3事件上触发Lambda [英] Cloudformation template to trigger Lambda on S3 event

问题描述

我想使用Cloudformation创建一个S3存储桶，该S3存储桶会在发生S3事件（例如文件创建，文件删除等）时触发Lambda函数。

I want to use Cloudformation to create an S3 bucket that will trigger Lambda function whenever an S3 event occurs such as file creation, file deletion, etc.

研究中，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 ，但该示例仅适用于EC2，我找不到S3的示例

I was looking at the AWS::Events::Rule, but the example is only for EC2 and I can't find examples for S3

  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"

我该怎么写

推荐答案

这里是一个示例，

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，您需要创建功能，然后再为其分配触发器。如果使用CF，请确保先创建lambda函数，然后再为其创建触发器。

One issue I have noticed is, you need to create the function before you assign a trigger to it. If you are doing with CF, make sure you create lambda function before you create trigger for it.

希望它会有所帮助。

这篇关于Cloudformation模板在S3事件上触发Lambda的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！