AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: messaging-sns-example

Resources:
  MySnsTopic:
    Type: AWS::SNS::Topic
    Properties:
      Subscription:
        - Protocol: lambda
          Endpoint: !GetAtt TopicConsumerFunction1.Arn    
        - Protocol: lambda
          Endpoint: !GetAtt TopicConsumerFunction2.Arn    

  TopicConsumerFunction1Permission:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref TopicConsumerFunction1
      Principal: sns.amazonaws.com

  TopicConsumerFunction2Permission:
    Type: 'AWS::Lambda::Permission'
    Properties:
      Action: 'lambda:InvokeFunction'
      FunctionName: !Ref TopicConsumerFunction2
      Principal: sns.amazonaws.com

  TopicPublisherFunction:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: code/
      Handler: publisher.handler
      Runtime: nodejs12.x
      Timeout: 3
      MemorySize: 128
      Environment:
        Variables:
          SNStopic: !Ref MySnsTopic
      Policies:
        ## Read more about SAM Policy templates at:
        ## https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-policy-templates.html
        - SNSPublishMessagePolicy:
            TopicName: !GetAtt MySnsTopic.TopicName

  TopicConsumerFunction1:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: code/
      Handler: consumer.handler
      Runtime: nodejs12.x
      Timeout: 3
      MemorySize: 128

  TopicConsumerFunction2:
    Type: AWS::Serverless::Function 
    Properties:
      CodeUri: code/
      Handler: consumer.handler
      Runtime: nodejs12.x
      Timeout: 3
      MemorySize: 128

Outputs:
  TopicPublisherFunction:
    Description: TopicPublisherFunction function name
    Value: !Ref TopicPublisherFunction
  TopicConsumerFunction1:
    Description: TopicConsumerFunction1 function name
    Value: !Ref TopicConsumerFunction1
  TopicConsumerFunction2:
    Description: TopicConsumerFunction2 function name
    Value: !Ref TopicConsumerFunction2