How was idempotency and error handling ensured?

Idempotency is ensured by the fact that a repeated call to an operation with the same parameters does not further change the state of the system. In Python, this can be implemented, for example, by storing unique request identifiers and checking them before executing the operation.

Error handling usually includes:

• Logging errors for subsequent analysis.
• Retry attempts with exponential backoff.
• Using exceptions to control the flow of execution.

An example of an idempotent function with error handling:

processed_requests = set()

def process_request(request_id, data):
    if request_id in processed_requests:
        return "Already processed"
    try:
        # Main processing logic
        # ...
        processed_requests.add(request_id)
        return "Success"
    except Exception as e:
        # Log the error
        print(f"Error: {e}")
        # Retry or return an error
        return "Processing error"

This approach guarantees that repeated calls with the same request_id will not lead to reprocessing.