def lambda_handler()

in src/backend/booking/src/cancel-booking/cancel.py [0:0]

• 17 lines of code
• 3 McCabe index (conditional complexity)

def lambda_handler(event, context):
    """AWS Lambda Function entrypoint to cancel booking

    Parameters
    ----------
    event: dict, required
        Step Functions State Machine event

        chargeId: string
            pre-authorization charge ID

    context: object, required
        Lambda Context runtime methods and attributes
        Context doc: https://docs.aws.amazon.com/lambda/latest/dg/python-context-object.html

    Returns
    -------
    boolean

    Raises
    ------
    BookingCancellationException
        Booking Cancellation Exception including error message upon failure
    """
    booking_id = event.get("bookingId")

    if not booking_id:
        metrics.add_metric(name="InvalidCancellationRequest", unit=MetricUnit.Count, value=1)
        logger.error({"operation": "input_validation", "details": event})
        raise ValueError("Invalid booking ID")

    try:
        logger.debug(f"Cancelling booking - {booking_id}")
        ret = cancel_booking(booking_id)

        metrics.add_metric(name="SuccessfulCancellation", unit=MetricUnit.Count, value=1)
        tracer.put_annotation("BookingStatus", "CANCELLED")

        return ret
    except BookingCancellationException as err:
        metrics.add_metric(name="FailedCancellation", unit=MetricUnit.Count, value=1)
        tracer.put_annotation("BookingStatus", "ERROR")
        logger.exception({"operation": "booking_cancellation"})
        raise