Step Machine - is there any kind of intrinsic functions for if statements?

0

I'm pretty new to Step Machines, I've created a relatively complex machine - which works quite well and is hooked up to API gateway. There's one piece of it which just feels a bit ugly to me, I've created this example but let me be clear that this is a "fake" example so explaining better ways of doing it via the API or whatever doesn't help much, I just want to achieve what I'm showing below but ideally in a neater way. I should also add what I've done works, but just isn't pretty.

Basically I set a variable using the pass functions with two different outputs based on a choice, what it feels like I should be able to do is something LIKE;

"S.$": "States.If($.resolution>1000,'Desktop','Mobile')"

Enter image description here

{
  "Comment": "A description of my state machine",
  "StartAt": "Choice",
  "States": {
    "Choice": {
      "Type": "Choice",
      "Choices": [
        {
          "Variable": "$.resolution",
          "NumericGreaterThan": 1000,
          "Next": "Status is OK"
        }
      ],
      "Default": "Status is Fail"
    },
    "Status is OK": {
      "Type": "Pass",
      "Next": "DynamoDB PutItem",
      "Result": {
        "type": "Desktop"
      },
      "ResultPath": "$.display"
    },
    "Status is Fail": {
      "Type": "Pass",
      "Next": "DynamoDB PutItem",
      "Result": {
        "type": "Mobile"
      },
      "ResultPath": "$.display"
    },
    "DynamoDB PutItem": {
      "Type": "Task",
      "Resource": "arn:aws:states:::dynamodb:putItem",
      "Parameters": {
        "TableName": "MyDynamoDBTable",
        "Item": {
          "Name": {
            "S.$": "$.name"
          },
          "DisplayType": {
            "S.$": "$.display.type"
          }
        }
      },
      "End": true
    }
  }
}
asked 2 months ago42 views
2 Answers
0

This is the list of intrinsic functions. As you can see, it does not include an if function.

Your only option is to use a Choice state.

I will raise it to the service team.

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EXPERT
Uri
answered 2 months ago
0

Hello, currently there is no intrinsic function in Step Functions which can control the execution flow like Choice state. Choice state is the only viable option right now in this use case. Please refer to [1] for more information on Intrinsic Functions in Step Functions

[1] Intrinsic functions: https://docs.aws.amazon.com/step-functions/latest/dg/amazon-states-language-intrinsic-functions.html

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answered 2 months ago

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