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.
- Clone the repository.
- Create a S3 bucket to store the terraform state file.
- Create the folder - 0069-celosia/<environment devl,test,prod>
- 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:
######################################## Project Name ############################################## project_name = "celosia" ######################################## 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-bda1-6f0362bc9b89" "us-east-2" = "arn:aws:kms:us-east-2:807724355529:key/dfc9fe4a-7021-4eb8-a8e9-520a2f91f4f2" "us-west-2" = "arn:aws:kms:us-west-2:807724355529:key/2e99fc66-0257-4f12-841e-38dcddb71a84" } ######################################## DynamoDB Table ############################################ dynamodb_table_base_name = "celosia-messages" partition_key = "MessageId" partition_key_data_type = "S" ######################################## SQS Queue ################################################# sqs_queue_base_name = "celosia-sqs-queue" delay_seconds = 0 max_message_size = 262144 message_retention_seconds = 345600 receive_wait_time_seconds = 10 ######################################## SNS Topic ################################################# sns_topic_base_name = "celosia-sns-topic" sns_topic_display_name = "SNS Topic to send a notification for CloudWatch Alarm" ######################################## SNS Topic Subscription #################################### sns_subscription_email = ["subhamay.aws@mailinator.com", "subhamay@mailinator.com"] ######################################## Lambda IAM Role / Policy ################################## lambda_iam_role_name = "celosia-lambda-role" lambda_iam_policy_name = "celosia-lambda-policy" ######################################## Step Function IAM Role #################################### sf_iam_role_name = "celosia-sf-role" sf_iam_policy_name = "celosia-sf-policy" ######################################## Lambda Function ########################################### lambda_function_base_name = "celosia-seed-dynamodb" lambda_function_description = "Celosia Lambda Function to seed the DynamoDB table with random values" memory_size = 256 runtime = "python3.9" timeout = 300 reserved_concurrent_executions = 1 - 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
{
"quotes":[
"Age is an issue of mind over matter. If you don't mind, it doesn't matter.- Mark Twain",
"Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young.- Henry Ford",
"Wrinkles should merely indicate where smiles have been.- Mark Twain",
"True terror is to wake up one morning and discover that your high school class is running the country.- Kurt Vonnegut",
"A diplomat is a man who always remembers a woman's birthday but never remembers her age.- Robert Frost",
"As I grow older, I pay less attention to what men say. I just watch what they do.- Andrew Carnegie",
"How incessant and great are the ills with which a prolonged old age is replete.- C. S. Lewis",
"Old age, believe me, is a good and pleasant thing. It is true you are gently shouldered off the stage, but then you are given such a comfortable front stall as spectator.- Confucius",
"Old age has deformities enough of its own. It should never add to them the deformity of vice.- Eleanor Roosevelt",
"Nobody grows old merely living a number of years. We grow old deserting our ideals. Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul.- Samuel Ullman",
"An archaeologist is the best husband a woman can have. The older she gets the more interested he is in her.- Agatha Christie",
"All diseases run into one, old age.- Ralph Waldo Emerson",
"Bashfulness is an ornament to youth, but a reproach to old age.- Aristotle",
"Like everyone else who makes the mistake of getting older, I begin each day with coffee and obituaries.- Bill Cosby",
"Age appears to be best in four things old wood best to burn, old wine to drink, old friends to trust, and old authors to read.- Francis Bacon",
"None are so old as those who have outlived enthusiasm.- Henry David Thoreau",
"Every man over forty is a scoundrel.- George Bernard Shaw",
"Forty is the old age of youth fifty the youth of old age.- Victor Hugo",
"You can't help getting older, but you don't have to get old.- George Burns",
"Alas, after a certain age every man is responsible for his face.- Albert Camus",
"Youth is when you're allowed to stay up late on New Year's Eve. Middle age is when you're forced to.- Bill Vaughan",
"Old age is like everything else. To make a success of it, you've got to start young.- Theodore Roosevelt",
"A comfortable old age is the reward of a well-spent youth. Instead of its bringing sad and melancholy prospects of decay, it would give us hopes of eternal youth in a better world.- Maurice Chevalier",
"A man growing old becomes a child again.- Sophocles",
"I will never be an old man. To me, old age is always 15 years older than I am.- Francis Bacon",
"Age considers youth ventures.- Rabindranath Tagore"
]
}
Post message in my blog (https://blog.subhamay.com)
Contributors names and contact info
Subhamay Bhattacharyya - subhamay.aws@gmail.com
https://docs.aws.amazon.com/step-functions/latest/dg/sample-project-transfer-data-sqs.html
- 0.1
- Initial Release
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