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Using Ref for Resource in Step function inside cloudformation template

I have a step function inside cloudformation. The cloudformation stack also create Lambdas which i will use as resource in step function. I have something like

TestLambda:
Type: "AWS::Lambda::Function"
Properties:
Handler: "test_lambda.lambda_handler"
Role: "arn:aws:iam::1234342334:role/Lambda"
Code:
ZipFile: !Sub |
from __future__ import print_function
import boto3
def lambda_handler(event, context):
print(event)
Runtime: "python2.7"

....

TestStateMachine:
Type: AWS::StepFunctions::StateMachine
Properties:
StateMachineName: "Test"
DefinitionString: |-
{
"StartAt": "State1",
"States": {
"State1" :
"Type" : "Task",
"Resource" : "$!GetAtt TestLambda.Arn",
"Next": "State2?"
,
...
...


all inside one cloudformation template.

"SCHEMA_VALIDATION_FAILED: Value is not a valid resource ARN"


I also tried !GetAtt TestLambda.Arn, it didn't work. I want the lambda and stepfunction created inside the single cloudformation template. Please let me know if there is better, cleaner way of doing it.

Thank you

1 Answer
1

You should use Fn::Sub function for that:

TestStateMachine:
Type: AWS::StepFunctions::StateMachine
Properties:
StateMachineName: "Test"
DefinitionString:
Fn::Sub:
|-
{
"StartAt": "State1",
"States": {
"State1" :
"Type" : "Task",
"Resource" : "$TestLambda.Arn",
"Next": "State2?"
,


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