Proposal: AWS::Serverless::Queue

[timoschilling]

Description:

Setting up an SQS Queue is sometimes more complicated than it needs to be.
Setting up an Queue should be done in the same DRY way it works for Lambdas.

Before example:

  Queue:
    Type: AWS::SQS::Queue
    Properties:
      RedrivePolicy:
        deadLetterTargetArn: !GetAtt DeadLetterQueue.Arn
        maxReceiveCount: 5

  DeadLetterQueue:
    Type: AWS::SQS::Queue

  QueuePolicy:
    Type: AWS::SQS::QueuePolicy
    Properties:
      Queues:
        - !Ref Queue
      PolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              AWS: '*'
            Action: SQS:SendMessage
            Resource: !GetAtt Queue.Arn
            Condition:
              ArnEquals:
                aws:SourceArn:
                  - !Ref SnsArn
                  - !GetAtt SomeResource.Arn

After Example:

  Queue:
    Type: AWS::Serverless::Queue
    Properties:
      DeadLetterQueue: true
      Sources:
         - Arn: !Ref SnsArn
         - Arn: !GetAtt SomeResource.Arn