This is a simple demo of an AWS Step function using Lambda, DynamoDB, SQS Queue to show looping within a workflow.

This is a demo of a step function to loop through a list of items. In the first state a Lambda function inserts some quotes (with is passed as an input) to the DynamoDB table and returns a list of patrtition keys. The state machine then loops through the list and in each iteration fetches the quote from the DynamoDB table and pushes it to a SQS Queue.

The entire stack is created using HashiCorp Terraform. Only for higher environment (test/prod) the SNS Topic will be encrypted using Customer Managed KMS Key.

• Clone the repository.
• Create a S3 bucket to store the terraform state file.
• Create the folder - 0069-daylily/
• Create a KMS Key for higher environment (test/prod) in the region where you want to deply the stack.
• Create the terraform.tfvars file with the appropriate variable values, a sample of it provided below:

      ## ---------------------------------------------------------------------------------------------------------------------
      ## Variable Values - Project Daylily
      ## Modification History:
      ##   - 1.0.0    Jun 3,2023   -- Initial Version
      ## ---------------------------------------------------------------------------------------------------------------------
  
      ######################################## Project Name ##############################################
      project_name = "daylily"
      ######################################## Environment Name ##########################################
      environment_name = "devl"
      ######################################## KMS Key ###################################################
      kms_key_alias = "alias/SB-KMS"
      kms_key_arn = {
      "us-east-1" = "arn:aws:kms:us-east-1:807724355529:key/e4c733c5-9fbe-4a90-bda1-6f0362bc9xxx"
      "us-east-2" = "arn:aws:kms:us-east-2:807724355529:key/dfc9fe4a-7021-4eb8-a8e9-520a2f91fyyy"
      "us-west-2" = "arn:aws:kms:us-west-2:807724355529:key/2e99fc66-0257-4f12-841e-38dcddb71zzz"
      }
      ######################################## SNS Topic #################################################
      sns_topic_base_name    = "sns-topic"
      sns_topic_display_name = "Daylily SNS Topic used in the step function using SNS and Wait state."
      ######################################## SNS Topic Subscription ####################################
      sns_subscription_email = ["[email protected]", "[email protected]"]
      ######################################## Step Function IAM Role ####################################
      sf_iam_role_name   = "step-function-role"
      sf_iam_policy_name = "step-function-policy"
  

• Modify the 01-provider.tf and change the S3 bucket to store the state region where you want to deploy the stack
• Run the following terraform commands from the projec directory:
  • terraform init
  • terraform validate
  • terraform plan
  • terraform apply -auto-approve
• To delete the stack run the following command:
  • terraform destroy -auto-approve

• Go to the Step Function Console and use the sample input and start the execution
• Step-by-step bullets

Post message in my blog (https://blog.subhamay.com)

Contributors names and contact info

Subhamay Bhattacharyya - [email protected]

https://docs.aws.amazon.com/step-functions/latest/dg/sample-project-transfer-data-sqs.html

• 0.1
  • Initial Release

None

AWS