amazon-web-services - 定义多个可以触发 Lambda 函数的 ARN

Question

这是我在 AWS 文档中看到的示例 CloudFormation 语法 AWS::Lambda::EventSourceMapping :

Type: "AWS::Lambda::EventSourceMapping"
Properties: 
  BatchSize: Integer
  Enabled: Boolean
  EventSourceArn: String
  FunctionName: String
  StartingPosition: String

假设我有一组 DDB Stream ARN，我想将其用作一个 lambda 函数的触发器(而不是一个 ARN 作为触发器)。我试图这样定义这种关系:

Parameters:
   DDBStreamARN:
     Type: String
     Default: arn:aws:dynamodb:us-west-2:someId1
     AllowedValues:
       - arn:aws:dynamodb:us-west-2:someId1
       - arn:aws:dynamodb:us-west-2:someId2
       - ...
     Description: ARNs for the DDB Streams

Resources:
  RegistrationRequestStreamMapping:
     Type: AWS::Lambda::EventSourceMapping
     Properties:
       BatchSize: 70
       EventSourceArn:
         Ref: DDBStreamARN
       FunctionName:
         Fn::GetAtt:
           - TestLambdaFunction
           - Arn
       StartingPosition: TRIM_HORIZON
       Enabled: True

但该语法似乎不起作用，因为只有默认值 ( arn:aws:dynamodb:us-west-2:someId1 ) 用作触发器，而其他 ARN 不会触发 lambda 函数。关于如何解决这个问题有什么建议吗？

Answer 1

您可以为同一个 lambda 定义多个 AWS::Lambda::EventSourceMapping。

例如；

RegistrationRequestStreamMapping1:
     Type: AWS::Lambda::EventSourceMapping
     Properties:
       BatchSize: 70
       EventSourceArn:
         Ref: DDBStream1ARN
       FunctionName:
         Fn::GetAtt:
           - TestLambdaFunction
           - Arn
       StartingPosition: TRIM_HORIZON
       Enabled: True

RegistrationRequestStreamMapping2:
     Type: AWS::Lambda::EventSourceMapping
     Properties:
       BatchSize: 70
       EventSourceArn:
         Ref: DDBStream2ARN
       FunctionName:
         Fn::GetAtt:
           - TestLambdaFunction
           - Arn
       StartingPosition: TRIM_HORIZON
       Enabled: True