Steps to Implement AWS Step functions

Step 1. Create an IAM Role

First, we need to create an IAM Role with the permissions that allow Step functions to get access to lambda.

1. Create a role under the IAM tab from the AWS Management Console.

Step 2: Select AWS Service under the Trusted Entity Type, under Use Case make sure to select Step Functions in the dropdown.

Step 3: Under the Add Permissions, leave it as default(Make sure AWSLambdaRole is added in the permissions policies). Then click on next to proceed.

Step 4: Under the Name, Review, and create section, enter the name of the Role according to you.

the Finally, click on create the role.

Now, before creating the step function, we will need to create the lambda functions since we need the ARN of the lambda functions in our step function code.

AWS step functions process that calls the AddNumbers service, First, we will add input numbers, and then it will be decided whether the output number is greater than or less than the given constraints and the final state will be decided upon the results. While we could have one Lambda function call the other, we worry that managing all of those connections will become challenging as the AddNumbers application becomes more sophisticated. Plus, any change in the flow of the application will require changes in multiple places, and we could end up writing the same code over and over again.