11-InvokeStateMachineAwsSDK.md

INVOKE STATE MACHINE WITH AWS SDK

1. INTRODUCTION

• Using the HelloWorld state machine build previously HelloWorld

2. LAMBDA FUNCTION TRIGGERING STATE MACHINE

(A) CREATE NEW LAMBDA FUNCTION

• Go to Lambda Console
• Choose Functions
• Choose Create function
• Select Author from scratch
• In the Basic information pane, for Function name enter invokeStateMachine
• For Runtime, choose either Node.js 20.x
• Under Role, select Create a custom role
• Under Role Name, enter a name for this role. In this case, lambda_step_functions
• Choose Allow
• Leave architecture set to x86_64
• Choose Create function

(B) EDIT CUSTOM ROLE CREATED

• Go to IAM
• Choose Roles
• Enter the role previously created. In this case lambda_step_functions
• Open the role
• Choose Attach policies
• Look for step
• Enable AWSStepFunctionsFullAccess
• Choose Attach policy

(C) SET CODE FOR LAMBDA FUNCTION

• Go to Lambda Console
• Choose Functions
• Enter the previous function created. In this case, invokeStateMachine
• Under code panel, substitute the previous code with the code on the Project 7
• Choose Save

Ps: The state machine ARN is located on Step Functions console

3. TEST

(A) LAMBDA CONSOLE

i. SETTING AND EXECUTING THE TEST

• Choose Test
• Select Create new test event
• Under Event template, choose an option. In this case, Hello World
• Under Event name, enter a name. In this case, test
• Under code input space, you can set the input data for the function (JSON format)

{
  "Comment": "Invoked from CloudWatch",
  "number": 5
}

• Choose Create
• Choose Test

ii. VISUAL RESULTS

• Under Execution result: ... (logs), you can see if the test was successful

(B) STEP FUNCTIONS CONSOLE

i. VERIFICATION

• Go to Step Functions console
• Enter the previous created state machine. In this case, Helloworld
• Open Executions tab
• Enter the most recent execution
• Verify the details shown

4. BIBLIOGRAPHICAL REFERENCES

• [1] Creating a Lambda state machine for Step Functions using AWS CDK