14. Update terminateInstance API endpoint to call UserTerminateEC2 Step Function

[JYC-L]

Project: ControlPanel
Summary:

Task Description:

• Currently, the POST /terminateInstance API endpoint directly invokes the terminateInstanceFunction Lambda, which returns a simple placeholder response.
• This task involves updating the terminateInstance API endpoint to invoke the UserTerminateEC2Workflow Step Function instead of the Lambda directly.
• The Step Function orchestrates the EC2 termination workflow (terminating EC2 instances, cleaning up resources, updating session state) and returns its execution status to the client.
• This decouples the API layer from the termination logic and enables complex multi-step workflows to be managed by Step Functions.

Acceptance Criteria:

• The POST /terminateInstance API endpoint now accepts userId and instanceId in the request body.
• The endpoint invokes the UserTerminateEC2Workflow Step Function with the request parameters.
• The API returns a success/failure status to the client without exposing internal execution details.
• Input validation is performed before invoking the Step Function (e.g., validate userId, instanceId).
• Error handling is implemented for Step Function invocation failures.
• The terminateInstanceFunction Lambda is still available for Step Function tasks but is no longer directly invoked by the API.
• Step Function execution ARN is stored internally (DynamoDB) but NOT returned to the client for security reasons.

Ticket Progress

• Documentation Walk-through and Research
• Code base review
• High level system design for the API data flow
• Implementation Plan
• Code Change: TerminateInstance Step Function Definiation Update
• Code Change: API gateway endpoint creation
• Code Change: DynamoDB table Schema
• Code change: Lambda functions